af_key.c 101.4 KB
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/*
 * net/key/af_key.c	An implementation of PF_KEYv2 sockets.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Maxim Giryaev	<gem@asplinux.ru>
 *		David S. Miller	<davem@redhat.com>
 *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *		Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 *		Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
 *		Derek Atkins <derek@ihtfp.com>
 */

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#include <linux/capability.h>
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/socket.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/xfrm.h>

#include <net/sock.h>

#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))

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static int pfkey_net_id __read_mostly;
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struct netns_pfkey {
	/* List of all pfkey sockets. */
	struct hlist_head table;
	atomic_t socks_nr;
};
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static DEFINE_MUTEX(pfkey_mutex);
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#define DUMMY_MARK 0
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static const struct xfrm_mark dummy_mark = {0, 0};
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struct pfkey_sock {
	/* struct sock must be the first member of struct pfkey_sock */
	struct sock	sk;
	int		registered;
	int		promisc;
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	struct {
		uint8_t		msg_version;
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		uint32_t	msg_portid;
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		int		(*dump)(struct pfkey_sock *sk);
		void		(*done)(struct pfkey_sock *sk);
		union {
			struct xfrm_policy_walk	policy;
			struct xfrm_state_walk	state;
		} u;
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		struct sk_buff	*skb;
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	} dump;
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};

static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
{
	return (struct pfkey_sock *)sk;
}

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static int pfkey_can_dump(const struct sock *sk)
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{
	if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
		return 1;
	return 0;
}

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static void pfkey_terminate_dump(struct pfkey_sock *pfk)
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{
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	if (pfk->dump.dump) {
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		if (pfk->dump.skb) {
			kfree_skb(pfk->dump.skb);
			pfk->dump.skb = NULL;
		}
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		pfk->dump.done(pfk);
		pfk->dump.dump = NULL;
		pfk->dump.done = NULL;
	}
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}

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static void pfkey_sock_destruct(struct sock *sk)
{
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	struct net *net = sock_net(sk);
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

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	pfkey_terminate_dump(pfkey_sk(sk));
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	skb_queue_purge(&sk->sk_receive_queue);

	if (!sock_flag(sk, SOCK_DEAD)) {
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		pr_err("Attempt to release alive pfkey socket: %p\n", sk);
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		return;
	}

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	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
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	atomic_dec(&net_pfkey->socks_nr);
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}

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static const struct proto_ops pfkey_ops;
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static void pfkey_insert(struct sock *sk)
{
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	struct net *net = sock_net(sk);
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

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	mutex_lock(&pfkey_mutex);
	sk_add_node_rcu(sk, &net_pfkey->table);
	mutex_unlock(&pfkey_mutex);
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}

static void pfkey_remove(struct sock *sk)
{
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	mutex_lock(&pfkey_mutex);
	sk_del_node_init_rcu(sk);
	mutex_unlock(&pfkey_mutex);
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}

static struct proto key_proto = {
	.name	  = "KEY",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct pfkey_sock),
};

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static int pfkey_create(struct net *net, struct socket *sock, int protocol,
			int kern)
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{
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	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
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	struct sock *sk;
	int err;

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	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
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		return -EPERM;
	if (sock->type != SOCK_RAW)
		return -ESOCKTNOSUPPORT;
	if (protocol != PF_KEY_V2)
		return -EPROTONOSUPPORT;

	err = -ENOMEM;
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	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
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	if (sk == NULL)
		goto out;
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	sock->ops = &pfkey_ops;
	sock_init_data(sock, sk);

	sk->sk_family = PF_KEY;
	sk->sk_destruct = pfkey_sock_destruct;

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	atomic_inc(&net_pfkey->socks_nr);
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	pfkey_insert(sk);

	return 0;
out:
	return err;
}

static int pfkey_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	if (!sk)
		return 0;

	pfkey_remove(sk);

	sock_orphan(sk);
	sock->sk = NULL;
	skb_queue_purge(&sk->sk_write_queue);
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	synchronize_rcu();
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	sock_put(sk);

	return 0;
}

static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
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			       gfp_t allocation, struct sock *sk)
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{
	int err = -ENOBUFS;

	sock_hold(sk);
	if (*skb2 == NULL) {
		if (atomic_read(&skb->users) != 1) {
			*skb2 = skb_clone(skb, allocation);
		} else {
			*skb2 = skb;
			atomic_inc(&skb->users);
		}
	}
	if (*skb2 != NULL) {
		if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
			skb_set_owner_r(*skb2, sk);
			skb_queue_tail(&sk->sk_receive_queue, *skb2);
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			sk->sk_data_ready(sk);
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			*skb2 = NULL;
			err = 0;
		}
	}
	sock_put(sk);
	return err;
}

/* Send SKB to all pfkey sockets matching selected criteria.  */
#define BROADCAST_ALL		0
#define BROADCAST_ONE		1
#define BROADCAST_REGISTERED	2
#define BROADCAST_PROMISC_ONLY	4
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static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
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			   int broadcast_flags, struct sock *one_sk,
			   struct net *net)
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{
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	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
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	struct sock *sk;
	struct sk_buff *skb2 = NULL;
	int err = -ESRCH;

	/* XXX Do we need something like netlink_overrun?  I think
	 * XXX PF_KEY socket apps will not mind current behavior.
	 */
	if (!skb)
		return -ENOMEM;

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	rcu_read_lock();
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	sk_for_each_rcu(sk, &net_pfkey->table) {
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		struct pfkey_sock *pfk = pfkey_sk(sk);
		int err2;

		/* Yes, it means that if you are meant to receive this
		 * pfkey message you receive it twice as promiscuous
		 * socket.
		 */
		if (pfk->promisc)
			pfkey_broadcast_one(skb, &skb2, allocation, sk);

		/* the exact target will be processed later */
		if (sk == one_sk)
			continue;
		if (broadcast_flags != BROADCAST_ALL) {
			if (broadcast_flags & BROADCAST_PROMISC_ONLY)
				continue;
			if ((broadcast_flags & BROADCAST_REGISTERED) &&
			    !pfk->registered)
				continue;
			if (broadcast_flags & BROADCAST_ONE)
				continue;
		}

		err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);

		/* Error is cleare after succecful sending to at least one
		 * registered KM */
		if ((broadcast_flags & BROADCAST_REGISTERED) && err)
			err = err2;
	}
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	rcu_read_unlock();
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	if (one_sk != NULL)
		err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);

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	kfree_skb(skb2);
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	kfree_skb(skb);
	return err;
}

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static int pfkey_do_dump(struct pfkey_sock *pfk)
{
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	struct sadb_msg *hdr;
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	int rc;

	rc = pfk->dump.dump(pfk);
	if (rc == -ENOBUFS)
		return 0;

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	if (pfk->dump.skb) {
		if (!pfkey_can_dump(&pfk->sk))
			return 0;

		hdr = (struct sadb_msg *) pfk->dump.skb->data;
		hdr->sadb_msg_seq = 0;
		hdr->sadb_msg_errno = rc;
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
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				&pfk->sk, sock_net(&pfk->sk));
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		pfk->dump.skb = NULL;
	}

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	pfkey_terminate_dump(pfk);
	return rc;
}

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static inline void pfkey_hdr_dup(struct sadb_msg *new,
				 const struct sadb_msg *orig)
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{
	*new = *orig;
}

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static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
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{
	struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
	struct sadb_msg *hdr;

	if (!skb)
		return -ENOBUFS;

	/* Woe be to the platform trying to support PFKEY yet
	 * having normal errnos outside the 1-255 range, inclusive.
	 */
	err = -err;
	if (err == ERESTARTSYS ||
	    err == ERESTARTNOHAND ||
	    err == ERESTARTNOINTR)
		err = EINTR;
	if (err >= 512)
		err = EINVAL;
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	BUG_ON(err <= 0 || err >= 256);
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	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	pfkey_hdr_dup(hdr, orig);
	hdr->sadb_msg_errno = (uint8_t) err;
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
			     sizeof(uint64_t));

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	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
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	return 0;
}

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static const u8 sadb_ext_min_len[] = {
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	[SADB_EXT_RESERVED]		= (u8) 0,
	[SADB_EXT_SA]			= (u8) sizeof(struct sadb_sa),
	[SADB_EXT_LIFETIME_CURRENT]	= (u8) sizeof(struct sadb_lifetime),
	[SADB_EXT_LIFETIME_HARD]	= (u8) sizeof(struct sadb_lifetime),
	[SADB_EXT_LIFETIME_SOFT]	= (u8) sizeof(struct sadb_lifetime),
	[SADB_EXT_ADDRESS_SRC]		= (u8) sizeof(struct sadb_address),
	[SADB_EXT_ADDRESS_DST]		= (u8) sizeof(struct sadb_address),
	[SADB_EXT_ADDRESS_PROXY]	= (u8) sizeof(struct sadb_address),
	[SADB_EXT_KEY_AUTH]		= (u8) sizeof(struct sadb_key),
	[SADB_EXT_KEY_ENCRYPT]		= (u8) sizeof(struct sadb_key),
	[SADB_EXT_IDENTITY_SRC]		= (u8) sizeof(struct sadb_ident),
	[SADB_EXT_IDENTITY_DST]		= (u8) sizeof(struct sadb_ident),
	[SADB_EXT_SENSITIVITY]		= (u8) sizeof(struct sadb_sens),
	[SADB_EXT_PROPOSAL]		= (u8) sizeof(struct sadb_prop),
	[SADB_EXT_SUPPORTED_AUTH]	= (u8) sizeof(struct sadb_supported),
	[SADB_EXT_SUPPORTED_ENCRYPT]	= (u8) sizeof(struct sadb_supported),
	[SADB_EXT_SPIRANGE]		= (u8) sizeof(struct sadb_spirange),
	[SADB_X_EXT_KMPRIVATE]		= (u8) sizeof(struct sadb_x_kmprivate),
	[SADB_X_EXT_POLICY]		= (u8) sizeof(struct sadb_x_policy),
	[SADB_X_EXT_SA2]		= (u8) sizeof(struct sadb_x_sa2),
	[SADB_X_EXT_NAT_T_TYPE]		= (u8) sizeof(struct sadb_x_nat_t_type),
	[SADB_X_EXT_NAT_T_SPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
	[SADB_X_EXT_NAT_T_DPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
	[SADB_X_EXT_NAT_T_OA]		= (u8) sizeof(struct sadb_address),
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	[SADB_X_EXT_SEC_CTX]		= (u8) sizeof(struct sadb_x_sec_ctx),
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	[SADB_X_EXT_KMADDRESS]		= (u8) sizeof(struct sadb_x_kmaddress),
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	[SADB_X_EXT_FILTER]		= (u8) sizeof(struct sadb_x_filter),
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};

/* Verify sadb_address_{len,prefixlen} against sa_family.  */
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static int verify_address_len(const void *p)
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{
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	const struct sadb_address *sp = p;
	const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
	const struct sockaddr_in *sin;
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#if IS_ENABLED(CONFIG_IPV6)
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	const struct sockaddr_in6 *sin6;
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#endif
	int len;

	switch (addr->sa_family) {
	case AF_INET:
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		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
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		if (sp->sadb_address_len != len ||
		    sp->sadb_address_prefixlen > 32)
			return -EINVAL;
		break;
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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
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		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
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		if (sp->sadb_address_len != len ||
		    sp->sadb_address_prefixlen > 128)
			return -EINVAL;
		break;
#endif
	default:
		/* It is user using kernel to keep track of security
		 * associations for another protocol, such as
		 * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
		 * lengths.
		 *
		 * XXX Actually, association/policy database is not yet
		 * XXX able to cope with arbitrary sockaddr families.
		 * XXX When it can, remove this -EINVAL.  -DaveM
		 */
		return -EINVAL;
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	}
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	return 0;
}

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static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
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{
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	return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
			    sec_ctx->sadb_x_ctx_len,
			    sizeof(uint64_t));
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}

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static inline int verify_sec_ctx_len(const void *p)
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{
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	const struct sadb_x_sec_ctx *sec_ctx = p;
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	int len = sec_ctx->sadb_x_ctx_len;
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	if (len > PAGE_SIZE)
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		return -EINVAL;

	len = pfkey_sec_ctx_len(sec_ctx);

	if (sec_ctx->sadb_x_sec_len != len)
		return -EINVAL;

	return 0;
}

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static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
								     gfp_t gfp)
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{
	struct xfrm_user_sec_ctx *uctx = NULL;
	int ctx_size = sec_ctx->sadb_x_ctx_len;

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	uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
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	if (!uctx)
		return NULL;

	uctx->len = pfkey_sec_ctx_len(sec_ctx);
	uctx->exttype = sec_ctx->sadb_x_sec_exttype;
	uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
	uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
	uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
	memcpy(uctx + 1, sec_ctx + 1,
	       uctx->ctx_len);

	return uctx;
}

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static int present_and_same_family(const struct sadb_address *src,
				   const struct sadb_address *dst)
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{
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	const struct sockaddr *s_addr, *d_addr;
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	if (!src || !dst)
		return 0;

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	s_addr = (const struct sockaddr *)(src + 1);
	d_addr = (const struct sockaddr *)(dst + 1);
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	if (s_addr->sa_family != d_addr->sa_family)
		return 0;
	if (s_addr->sa_family != AF_INET
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#if IS_ENABLED(CONFIG_IPV6)
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	    && s_addr->sa_family != AF_INET6
#endif
		)
		return 0;

	return 1;
}

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static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
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{
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	const char *p = (char *) hdr;
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	int len = skb->len;

	len -= sizeof(*hdr);
	p += sizeof(*hdr);
	while (len > 0) {
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		const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
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		uint16_t ext_type;
		int ext_len;

		ext_len  = ehdr->sadb_ext_len;
		ext_len *= sizeof(uint64_t);
		ext_type = ehdr->sadb_ext_type;
		if (ext_len < sizeof(uint64_t) ||
		    ext_len > len ||
		    ext_type == SADB_EXT_RESERVED)
			return -EINVAL;

		if (ext_type <= SADB_EXT_MAX) {
			int min = (int) sadb_ext_min_len[ext_type];
			if (ext_len < min)
				return -EINVAL;
			if (ext_hdrs[ext_type-1] != NULL)
				return -EINVAL;
			if (ext_type == SADB_EXT_ADDRESS_SRC ||
			    ext_type == SADB_EXT_ADDRESS_DST ||
			    ext_type == SADB_EXT_ADDRESS_PROXY ||
			    ext_type == SADB_X_EXT_NAT_T_OA) {
				if (verify_address_len(p))
					return -EINVAL;
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			}
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			if (ext_type == SADB_X_EXT_SEC_CTX) {
				if (verify_sec_ctx_len(p))
					return -EINVAL;
			}
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			ext_hdrs[ext_type-1] = (void *) p;
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		}
		p   += ext_len;
		len -= ext_len;
	}

	return 0;
}

static uint16_t
pfkey_satype2proto(uint8_t satype)
{
	switch (satype) {
	case SADB_SATYPE_UNSPEC:
		return IPSEC_PROTO_ANY;
	case SADB_SATYPE_AH:
		return IPPROTO_AH;
	case SADB_SATYPE_ESP:
		return IPPROTO_ESP;
	case SADB_X_SATYPE_IPCOMP:
		return IPPROTO_COMP;
	default:
		return 0;
	}
	/* NOTREACHED */
}

static uint8_t
pfkey_proto2satype(uint16_t proto)
{
	switch (proto) {
	case IPPROTO_AH:
		return SADB_SATYPE_AH;
	case IPPROTO_ESP:
		return SADB_SATYPE_ESP;
	case IPPROTO_COMP:
		return SADB_X_SATYPE_IPCOMP;
	default:
		return 0;
	}
	/* NOTREACHED */
}

/* BTW, this scheme means that there is no way with PFKEY2 sockets to
 * say specifically 'just raw sockets' as we encode them as 255.
 */

static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
{
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	return proto == IPSEC_PROTO_ANY ? 0 : proto;
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}

static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
{
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	return proto ? proto : IPSEC_PROTO_ANY;
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}

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static inline int pfkey_sockaddr_len(sa_family_t family)
{
	switch (family) {
	case AF_INET:
		return sizeof(struct sockaddr_in);
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	case AF_INET6:
		return sizeof(struct sockaddr_in6);
#endif
	}
	return 0;
}

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static
int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
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{
590
	switch (sa->sa_family) {
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	case AF_INET:
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		xaddr->a4 =
593
			((struct sockaddr_in *)sa)->sin_addr.s_addr;
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		return AF_INET;
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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
597
		memcpy(xaddr->a6,
598
		       &((struct sockaddr_in6 *)sa)->sin6_addr,
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		       sizeof(struct in6_addr));
		return AF_INET6;
#endif
	}
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	return 0;
}

static
607
int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
608 609 610
{
	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
				      xaddr);
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}

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static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
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{
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	const struct sadb_sa *sa;
	const struct sadb_address *addr;
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	uint16_t proto;
	unsigned short family;
	xfrm_address_t *xaddr;

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	sa = ext_hdrs[SADB_EXT_SA - 1];
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	if (sa == NULL)
		return NULL;

	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
	if (proto == 0)
		return NULL;

	/* sadb_address_len should be checked by caller */
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	addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
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	if (addr == NULL)
		return NULL;

634
	family = ((const struct sockaddr *)(addr + 1))->sa_family;
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	switch (family) {
	case AF_INET:
637
		xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
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		break;
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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
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		xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
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		break;
#endif
	default:
		xaddr = NULL;
	}

	if (!xaddr)
		return NULL;

651
	return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
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}

#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
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static int
pfkey_sockaddr_size(sa_family_t family)
{
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	return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
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}

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static inline int pfkey_mode_from_xfrm(int mode)
{
	switch(mode) {
	case XFRM_MODE_TRANSPORT:
		return IPSEC_MODE_TRANSPORT;
	case XFRM_MODE_TUNNEL:
		return IPSEC_MODE_TUNNEL;
	case XFRM_MODE_BEET:
		return IPSEC_MODE_BEET;
	default:
		return -1;
	}
}

static inline int pfkey_mode_to_xfrm(int mode)
{
	switch(mode) {
	case IPSEC_MODE_ANY:	/*XXX*/
	case IPSEC_MODE_TRANSPORT:
		return XFRM_MODE_TRANSPORT;
	case IPSEC_MODE_TUNNEL:
		return XFRM_MODE_TUNNEL;
	case IPSEC_MODE_BEET:
		return XFRM_MODE_BEET;
	default:
		return -1;
	}
}

691
static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
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					struct sockaddr *sa,
					unsigned short family)
694 695 696 697 698 699 700 701 702 703 704
{
	switch (family) {
	case AF_INET:
	    {
		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
		sin->sin_family = AF_INET;
		sin->sin_port = port;
		sin->sin_addr.s_addr = xaddr->a4;
		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
		return 32;
	    }
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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
	    {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
		sin6->sin6_family = AF_INET6;
		sin6->sin6_port = port;
		sin6->sin6_flowinfo = 0;
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		sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
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		sin6->sin6_scope_id = 0;
		return 128;
	    }
#endif
	}
	return 0;
}

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static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
722
					      int add_keys, int hsc)
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{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_sa *sa;
	struct sadb_lifetime *lifetime;
	struct sadb_address *addr;
	struct sadb_key *key;
	struct sadb_x_sa2 *sa2;
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	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
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	int size;
	int auth_key_size = 0;
	int encrypt_key_size = 0;
	int sockaddr_size;
	struct xfrm_encap_tmpl *natt = NULL;
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	int mode;
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	/* address family check */
	sockaddr_size = pfkey_sockaddr_size(x->props.family);
	if (!sockaddr_size)
		return ERR_PTR(-EINVAL);

	/* base, SA, (lifetime (HSC),) address(SD), (address(P),)
	   key(AE), (identity(SD),) (sensitivity)> */
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	size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
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		sizeof(struct sadb_lifetime) +
		((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
		((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
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			sizeof(struct sadb_address)*2 +
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				sockaddr_size*2 +
					sizeof(struct sadb_x_sa2);
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	if ((xfrm_ctx = x->security)) {
		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
		size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
	}

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	/* identity & sensitivity */
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	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
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		size += sizeof(struct sadb_address) + sockaddr_size;

	if (add_keys) {
		if (x->aalg && x->aalg->alg_key_len) {
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			auth_key_size =
				PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
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			size += sizeof(struct sadb_key) + auth_key_size;
		}
		if (x->ealg && x->ealg->alg_key_len) {
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			encrypt_key_size =
				PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
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			size += sizeof(struct sadb_key) + encrypt_key_size;
		}
	}
	if (x->encap)
		natt = x->encap;

	if (natt && natt->encap_type) {
		size += sizeof(struct sadb_x_nat_t_type);
		size += sizeof(struct sadb_x_nat_t_port);
		size += sizeof(struct sadb_x_nat_t_port);
	}

	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return ERR_PTR(-ENOBUFS);

	/* call should fill header later */
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	memset(hdr, 0, size);	/* XXX do we need this ? */
	hdr->sadb_msg_len = size / sizeof(uint64_t);

	/* sa */
	sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
	sa->sadb_sa_exttype = SADB_EXT_SA;
	sa->sadb_sa_spi = x->id.spi;
	sa->sadb_sa_replay = x->props.replay_window;
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	switch (x->km.state) {
	case XFRM_STATE_VALID:
		sa->sadb_sa_state = x->km.dying ?
			SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
		break;
	case XFRM_STATE_ACQ:
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		sa->sadb_sa_state = SADB_SASTATE_LARVAL;
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		break;
	default:
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		sa->sadb_sa_state = SADB_SASTATE_DEAD;
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		break;
	}
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	sa->sadb_sa_auth = 0;
	if (x->aalg) {
		struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
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		sa->sadb_sa_auth = (a && a->pfkey_supported) ?
					a->desc.sadb_alg_id : 0;
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	}
	sa->sadb_sa_encrypt = 0;
	BUG_ON(x->ealg && x->calg);
	if (x->ealg) {
		struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
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		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
					a->desc.sadb_alg_id : 0;
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	}
	/* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
	if (x->calg) {
		struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
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		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
					a->desc.sadb_alg_id : 0;
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	}

	sa->sadb_sa_flags = 0;
	if (x->props.flags & XFRM_STATE_NOECN)
		sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
		sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
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	if (x->props.flags & XFRM_STATE_NOPMTUDISC)
		sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
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	/* hard time */
	if (hsc & 2) {
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		lifetime = (struct sadb_lifetime *)  skb_put(skb,
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							     sizeof(struct sadb_lifetime));
		lifetime->sadb_lifetime_len =
			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
		lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
		lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
	}
	/* soft time */
	if (hsc & 1) {
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		lifetime = (struct sadb_lifetime *)  skb_put(skb,
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							     sizeof(struct sadb_lifetime));
		lifetime->sadb_lifetime_len =
			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
		lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
		lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
	}
	/* current time */
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
						     sizeof(struct sadb_lifetime));
	lifetime->sadb_lifetime_len =
		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
	lifetime->sadb_lifetime_allocations = x->curlft.packets;
	lifetime->sadb_lifetime_bytes = x->curlft.bytes;
	lifetime->sadb_lifetime_addtime = x->curlft.add_time;
	lifetime->sadb_lifetime_usetime = x->curlft.use_time;
	/* src address */
876
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
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	addr->sadb_address_len =
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		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
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	/* "if the ports are non-zero, then the sadb_address_proto field,
	   normally zero, MUST be filled in with the transport
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	   protocol's number." - RFC2367 */
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	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

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	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->props.saddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
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		BUG();

	/* dst address */
896
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
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	addr->sadb_address_len =
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		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
902
	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

905 906 907 908 909 910
	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->id.daddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
		BUG();
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	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
			     x->props.family)) {
914 915 916 917 918 919 920 921 922 923
		addr = (struct sadb_address*) skb_put(skb,
			sizeof(struct sadb_address)+sockaddr_size);
		addr->sadb_address_len =
			(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
		addr->sadb_address_proto =
			pfkey_proto_from_xfrm(x->sel.proto);
		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
		addr->sadb_address_reserved = 0;
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		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
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	}

	/* auth key */
	if (add_keys && auth_key_size) {
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		key = (struct sadb_key *) skb_put(skb,
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						  sizeof(struct sadb_key)+auth_key_size);
		key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
			sizeof(uint64_t);
		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
		key->sadb_key_bits = x->aalg->alg_key_len;
		key->sadb_key_reserved = 0;
		memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
	}
	/* encrypt key */
	if (add_keys && encrypt_key_size) {
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		key = (struct sadb_key *) skb_put(skb,
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						  sizeof(struct sadb_key)+encrypt_key_size);
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		key->sadb_key_len = (sizeof(struct sadb_key) +
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				     encrypt_key_size) / sizeof(uint64_t);
		key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
		key->sadb_key_bits = x->ealg->alg_key_len;
		key->sadb_key_reserved = 0;
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		memcpy(key + 1, x->ealg->alg_key,
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		       (x->ealg->alg_key_len+7)/8);
	}

	/* sa */
	sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
	sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
958 959 960 961 962
	if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
		kfree_skb(skb);
		return ERR_PTR(-EINVAL);
	}
	sa2->sadb_x_sa2_mode = mode;
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	sa2->sadb_x_sa2_reserved1 = 0;
	sa2->sadb_x_sa2_reserved2 = 0;
	sa2->sadb_x_sa2_sequence = 0;
	sa2->sadb_x_sa2_reqid = x->props.reqid;

	if (natt && natt->encap_type) {
		struct sadb_x_nat_t_type *n_type;
		struct sadb_x_nat_t_port *n_port;

		/* type */
		n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
		n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
		n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
		n_type->sadb_x_nat_t_type_type = natt->encap_type;
		n_type->sadb_x_nat_t_type_reserved[0] = 0;
		n_type->sadb_x_nat_t_type_reserved[1] = 0;
		n_type->sadb_x_nat_t_type_reserved[2] = 0;

		/* source port */
		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
		n_port->sadb_x_nat_t_port_port = natt->encap_sport;
		n_port->sadb_x_nat_t_port_reserved = 0;

		/* dest port */
		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
		n_port->sadb_x_nat_t_port_port = natt->encap_dport;
		n_port->sadb_x_nat_t_port_reserved = 0;
	}

996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
	/* security context */
	if (xfrm_ctx) {
		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
				sizeof(struct sadb_x_sec_ctx) + ctx_size);
		sec_ctx->sadb_x_sec_len =
		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
		       xfrm_ctx->ctx_len);
	}

L
Linus Torvalds 已提交
1010 1011 1012
	return skb;
}

1013

1014
static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015 1016 1017 1018 1019 1020 1021 1022
{
	struct sk_buff *skb;

	skb = __pfkey_xfrm_state2msg(x, 1, 3);

	return skb;
}

1023
static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024 1025 1026 1027 1028
							  int hsc)
{
	return __pfkey_xfrm_state2msg(x, 0, hsc);
}

A
Alexey Dobriyan 已提交
1029
static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030 1031
						const struct sadb_msg *hdr,
						void * const *ext_hdrs)
L
Linus Torvalds 已提交
1032
{
1033
	struct xfrm_state *x;
1034 1035 1036 1037
	const struct sadb_lifetime *lifetime;
	const struct sadb_sa *sa;
	const struct sadb_key *key;
	const struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
1038 1039
	uint16_t proto;
	int err;
1040

L
Linus Torvalds 已提交
1041

J
Joe Perches 已提交
1042
	sa = ext_hdrs[SADB_EXT_SA - 1];
L
Linus Torvalds 已提交
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
	if (!sa ||
	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
		return ERR_PTR(-EINVAL);
	if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
	    !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
		return ERR_PTR(-EINVAL);
	if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
	    !ext_hdrs[SADB_EXT_KEY_AUTH-1])
		return ERR_PTR(-EINVAL);
	if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
	    !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
		return ERR_PTR(-EINVAL);

	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
	if (proto == 0)
		return ERR_PTR(-EINVAL);

	/* default error is no buffer space */
	err = -ENOBUFS;

	/* RFC2367:

   Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
   SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
   sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
   Therefore, the sadb_sa_state field of all submitted SAs MUST be
   SADB_SASTATE_MATURE and the kernel MUST return an error if this is
   not true.

1073
	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078 1079 1080
	   Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
	 */
	if (sa->sadb_sa_auth > SADB_AALG_MAX ||
	    (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
	     sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
	    sa->sadb_sa_encrypt > SADB_EALG_MAX)
		return ERR_PTR(-EINVAL);
J
Joe Perches 已提交
1081
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
	if (key != NULL &&
	    sa->sadb_sa_auth != SADB_X_AALG_NULL &&
	    ((key->sadb_key_bits+7) / 8 == 0 ||
	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
		return ERR_PTR(-EINVAL);
	key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
	if (key != NULL &&
	    sa->sadb_sa_encrypt != SADB_EALG_NULL &&
	    ((key->sadb_key_bits+7) / 8 == 0 ||
	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
		return ERR_PTR(-EINVAL);

A
Alexey Dobriyan 已提交
1094
	x = xfrm_state_alloc(net);
L
Linus Torvalds 已提交
1095 1096 1097 1098 1099
	if (x == NULL)
		return ERR_PTR(-ENOBUFS);

	x->id.proto = proto;
	x->id.spi = sa->sadb_sa_spi;
1100 1101
	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
					(sizeof(x->replay.bitmap) * 8));
L
Linus Torvalds 已提交
1102 1103 1104 1105
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
		x->props.flags |= XFRM_STATE_NOECN;
	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
		x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106 1107
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
L
Linus Torvalds 已提交
1108

J
Joe Perches 已提交
1109
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
L
Linus Torvalds 已提交
1110 1111 1112 1113 1114 1115
	if (lifetime != NULL) {
		x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
		x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
		x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
		x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
	}
J
Joe Perches 已提交
1116
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
L
Linus Torvalds 已提交
1117 1118 1119 1120 1121 1122
	if (lifetime != NULL) {
		x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
		x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
		x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
		x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
	}
1123

J
Joe Perches 已提交
1124
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125
	if (sec_ctx != NULL) {
1126
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137

		if (!uctx)
			goto out;

		err = security_xfrm_state_alloc(x, uctx);
		kfree(uctx);

		if (err)
			goto out;
	}

J
Joe Perches 已提交
1138
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1139 1140 1141
	if (sa->sadb_sa_auth) {
		int keysize = 0;
		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142
		if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
			err = -ENOSYS;
			goto out;
		}
		if (key)
			keysize = (key->sadb_key_bits + 7) / 8;
		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
		if (!x->aalg)
			goto out;
		strcpy(x->aalg->alg_name, a->name);
		x->aalg->alg_key_len = 0;
		if (key) {
			x->aalg->alg_key_len = key->sadb_key_bits;
			memcpy(x->aalg->alg_key, key+1, keysize);
		}
1157
		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
L
Linus Torvalds 已提交
1158 1159 1160 1161 1162 1163
		x->props.aalgo = sa->sadb_sa_auth;
		/* x->algo.flags = sa->sadb_sa_flags; */
	}
	if (sa->sadb_sa_encrypt) {
		if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
			struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
				err = -ENOSYS;
				goto out;
			}
			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
			if (!x->calg)
				goto out;
			strcpy(x->calg->alg_name, a->name);
			x->props.calgo = sa->sadb_sa_encrypt;
		} else {
			int keysize = 0;
			struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
				err = -ENOSYS;
				goto out;
			}
			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
			if (key)
				keysize = (key->sadb_key_bits + 7) / 8;
			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
			if (!x->ealg)
				goto out;
			strcpy(x->ealg->alg_name, a->name);
			x->ealg->alg_key_len = 0;
			if (key) {
				x->ealg->alg_key_len = key->sadb_key_bits;
				memcpy(x->ealg->alg_key, key+1, keysize);
			}
			x->props.ealgo = sa->sadb_sa_encrypt;
		}
	}
	/* x->algo.flags = sa->sadb_sa_flags; */

1197
	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
L
Linus Torvalds 已提交
1198
						    &x->props.saddr);
1199
	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
L
Linus Torvalds 已提交
1200 1201 1202
				  &x->id.daddr);

	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1203
		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1204 1205 1206 1207 1208 1209
		int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0) {
			err = -EINVAL;
			goto out;
		}
		x->props.mode = mode;
L
Linus Torvalds 已提交
1210 1211 1212 1213
		x->props.reqid = sa2->sadb_x_sa2_reqid;
	}

	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1214
		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
L
Linus Torvalds 已提交
1215 1216 1217 1218 1219 1220

		/* Nobody uses this, but we try. */
		x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
		x->sel.prefixlen_s = addr->sadb_address_prefixlen;
	}

1221
	if (!x->sel.family)
1222 1223
		x->sel.family = x->props.family;

L
Linus Torvalds 已提交
1224
	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1225
		const struct sadb_x_nat_t_type* n_type;
L
Linus Torvalds 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
		struct xfrm_encap_tmpl *natt;

		x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
		if (!x->encap)
			goto out;

		natt = x->encap;
		n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
		natt->encap_type = n_type->sadb_x_nat_t_type_type;

		if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1237
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1238 1239 1240 1241
				ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
			natt->encap_sport = n_port->sadb_x_nat_t_port_port;
		}
		if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1242
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1243 1244 1245
				ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
			natt->encap_dport = n_port->sadb_x_nat_t_port_port;
		}
T
Timo Teras 已提交
1246
		memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
L
Linus Torvalds 已提交
1247 1248
	}

H
Herbert Xu 已提交
1249 1250
	err = xfrm_init_state(x);
	if (err)
L
Linus Torvalds 已提交
1251
		goto out;
H
Herbert Xu 已提交
1252

L
Linus Torvalds 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261
	x->km.seq = hdr->sadb_msg_seq;
	return x;

out:
	x->km.state = XFRM_STATE_DEAD;
	xfrm_state_put(x);
	return ERR_PTR(err);
}

1262
static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1263 1264 1265 1266
{
	return -EOPNOTSUPP;
}

1267
static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1268
{
A
Alexey Dobriyan 已提交
1269
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1270 1271 1272 1273
	struct sk_buff *resp_skb;
	struct sadb_x_sa2 *sa2;
	struct sadb_address *saddr, *daddr;
	struct sadb_msg *out_hdr;
1274
	struct sadb_spirange *range;
L
Linus Torvalds 已提交
1275
	struct xfrm_state *x = NULL;
1276
	int mode;
1277 1278
	int err;
	u32 min_spi, max_spi;
L
Linus Torvalds 已提交
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
	u32 reqid;
	u8 proto;
	unsigned short family;
	xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
		return -EINVAL;

	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
	if (proto == 0)
		return -EINVAL;

	if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1293 1294 1295
		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0)
			return -EINVAL;
L
Linus Torvalds 已提交
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
		reqid = sa2->sadb_x_sa2_reqid;
	} else {
		mode = 0;
		reqid = 0;
	}

	saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
	daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];

	family = ((struct sockaddr *)(saddr + 1))->sa_family;
	switch (family) {
	case AF_INET:
		xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
		xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
		break;
E
Eric Dumazet 已提交
1311
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
1312 1313 1314 1315 1316 1317 1318 1319
	case AF_INET6:
		xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
		xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
		break;
#endif
	}

	if (hdr->sadb_msg_seq) {
1320
		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1321
		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
L
Linus Torvalds 已提交
1322 1323 1324 1325 1326 1327
			xfrm_state_put(x);
			x = NULL;
		}
	}

	if (!x)
1328
		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
L
Linus Torvalds 已提交
1329 1330 1331 1332

	if (x == NULL)
		return -ENOENT;

1333 1334
	min_spi = 0x100;
	max_spi = 0x0fffffff;
L
Linus Torvalds 已提交
1335

1336 1337 1338 1339
	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
	if (range) {
		min_spi = range->sadb_spirange_min;
		max_spi = range->sadb_spirange_max;
L
Linus Torvalds 已提交
1340
	}
1341

1342 1343 1344 1345 1346 1347
	err = verify_spi_info(x->id.proto, min_spi, max_spi);
	if (err) {
		xfrm_state_put(x);
		return err;
	}

1348
	err = xfrm_alloc_spi(x, min_spi, max_spi);
1349
	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366

	if (IS_ERR(resp_skb)) {
		xfrm_state_put(x);
		return  PTR_ERR(resp_skb);
	}

	out_hdr = (struct sadb_msg *) resp_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
	out_hdr->sadb_msg_type = SADB_GETSPI;
	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_reserved = 0;
	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;

	xfrm_state_put(x);

A
Alexey Dobriyan 已提交
1367
	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
L
Linus Torvalds 已提交
1368 1369 1370 1371

	return 0;
}

1372
static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1373
{
A
Alexey Dobriyan 已提交
1374
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1375 1376 1377 1378 1379 1380 1381 1382
	struct xfrm_state *x;

	if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
		return -EOPNOTSUPP;

	if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
		return 0;

1383
	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
L
Linus Torvalds 已提交
1384 1385 1386 1387
	if (x == NULL)
		return 0;

	spin_lock_bh(&x->lock);
1388
	if (x->km.state == XFRM_STATE_ACQ)
L
Linus Torvalds 已提交
1389
		x->km.state = XFRM_STATE_ERROR;
1390

L
Linus Torvalds 已提交
1391 1392 1393 1394 1395
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return 0;
}

1396 1397 1398
static inline int event2poltype(int event)
{
	switch (event) {
1399
	case XFRM_MSG_DELPOLICY:
1400
		return SADB_X_SPDDELETE;
1401
	case XFRM_MSG_NEWPOLICY:
1402
		return SADB_X_SPDADD;
1403
	case XFRM_MSG_UPDPOLICY:
1404
		return SADB_X_SPDUPDATE;
1405
	case XFRM_MSG_POLEXPIRE:
1406 1407
	//	return SADB_X_SPDEXPIRE;
	default:
1408
		pr_err("pfkey: Unknown policy event %d\n", event);
1409 1410 1411 1412 1413 1414 1415 1416 1417
		break;
	}

	return 0;
}

static inline int event2keytype(int event)
{
	switch (event) {
1418
	case XFRM_MSG_DELSA:
1419
		return SADB_DELETE;
1420
	case XFRM_MSG_NEWSA:
1421
		return SADB_ADD;
1422
	case XFRM_MSG_UPDSA:
1423
		return SADB_UPDATE;
1424
	case XFRM_MSG_EXPIRE:
1425 1426
		return SADB_EXPIRE;
	default:
1427
		pr_err("pfkey: Unknown SA event %d\n", event);
1428 1429 1430 1431 1432 1433 1434
		break;
	}

	return 0;
}

/* ADD/UPD/DEL */
1435
static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1436 1437 1438 1439
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

1440
	skb = pfkey_xfrm_state2msg(x);
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451

	if (IS_ERR(skb))
		return PTR_ERR(skb);

	hdr = (struct sadb_msg *) skb->data;
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_type = event2keytype(c->event);
	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
	hdr->sadb_msg_errno = 0;
	hdr->sadb_msg_reserved = 0;
	hdr->sadb_msg_seq = c->seq;
1452
	hdr->sadb_msg_pid = c->portid;
1453

A
Alexey Dobriyan 已提交
1454
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1455 1456 1457

	return 0;
}
L
Linus Torvalds 已提交
1458

1459
static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1460
{
A
Alexey Dobriyan 已提交
1461
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1462 1463
	struct xfrm_state *x;
	int err;
1464
	struct km_event c;
L
Linus Torvalds 已提交
1465

A
Alexey Dobriyan 已提交
1466
	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1467 1468 1469
	if (IS_ERR(x))
		return PTR_ERR(x);

1470
	xfrm_state_hold(x);
L
Linus Torvalds 已提交
1471 1472 1473 1474 1475
	if (hdr->sadb_msg_type == SADB_ADD)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

1476
	xfrm_audit_state_add(x, err ? 0 : 1, true);
J
Joy Latten 已提交
1477

L
Linus Torvalds 已提交
1478 1479
	if (err < 0) {
		x->km.state = XFRM_STATE_DEAD;
1480
		__xfrm_state_put(x);
1481
		goto out;
L
Linus Torvalds 已提交
1482 1483
	}

1484
	if (hdr->sadb_msg_type == SADB_ADD)
1485
		c.event = XFRM_MSG_NEWSA;
1486
	else
1487
		c.event = XFRM_MSG_UPDSA;
1488
	c.seq = hdr->sadb_msg_seq;
1489
	c.portid = hdr->sadb_msg_pid;
1490
	km_state_notify(x, &c);
1491
out:
1492 1493
	xfrm_state_put(x);
	return err;
L
Linus Torvalds 已提交
1494 1495
}

1496
static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1497
{
A
Alexey Dobriyan 已提交
1498
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1499
	struct xfrm_state *x;
1500 1501
	struct km_event c;
	int err;
L
Linus Torvalds 已提交
1502 1503 1504 1505 1506 1507

	if (!ext_hdrs[SADB_EXT_SA-1] ||
	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
		return -EINVAL;

A
Alexey Dobriyan 已提交
1508
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1509 1510 1511
	if (x == NULL)
		return -ESRCH;

C
Catherine Zhang 已提交
1512 1513 1514
	if ((err = security_xfrm_state_delete(x)))
		goto out;

L
Linus Torvalds 已提交
1515
	if (xfrm_state_kern(x)) {
C
Catherine Zhang 已提交
1516 1517
		err = -EPERM;
		goto out;
L
Linus Torvalds 已提交
1518
	}
J
Joy Latten 已提交
1519

1520
	err = xfrm_state_delete(x);
J
Joy Latten 已提交
1521

C
Catherine Zhang 已提交
1522 1523
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
1524

1525
	c.seq = hdr->sadb_msg_seq;
1526
	c.portid = hdr->sadb_msg_pid;
1527
	c.event = XFRM_MSG_DELSA;
1528
	km_state_notify(x, &c);
C
Catherine Zhang 已提交
1529
out:
1530
	xfrm_audit_state_delete(x, err ? 0 : 1, true);
1531
	xfrm_state_put(x);
L
Linus Torvalds 已提交
1532

1533
	return err;
L
Linus Torvalds 已提交
1534 1535
}

1536
static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1537
{
A
Alexey Dobriyan 已提交
1538
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
	__u8 proto;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	struct xfrm_state *x;

	if (!ext_hdrs[SADB_EXT_SA-1] ||
	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
		return -EINVAL;

A
Alexey Dobriyan 已提交
1549
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1550 1551 1552
	if (x == NULL)
		return -ESRCH;

1553
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1554 1555 1556 1557 1558 1559 1560
	proto = x->id.proto;
	xfrm_state_put(x);
	if (IS_ERR(out_skb))
		return  PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561
	out_hdr->sadb_msg_type = SADB_GET;
L
Linus Torvalds 已提交
1562 1563 1564 1565 1566
	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_reserved = 0;
	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
A
Alexey Dobriyan 已提交
1567
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
L
Linus Torvalds 已提交
1568 1569 1570 1571

	return 0;
}

1572
static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
A
Al Viro 已提交
1573
					      gfp_t allocation)
L
Linus Torvalds 已提交
1574 1575 1576 1577 1578
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	int len, auth_len, enc_len, i;

1579
	auth_len = xfrm_count_pfkey_auth_supported();
L
Linus Torvalds 已提交
1580 1581 1582 1583
	if (auth_len) {
		auth_len *= sizeof(struct sadb_alg);
		auth_len += sizeof(struct sadb_supported);
	}
1584

1585
	enc_len = xfrm_count_pfkey_enc_supported();
L
Linus Torvalds 已提交
1586 1587 1588 1589
	if (enc_len) {
		enc_len *= sizeof(struct sadb_alg);
		enc_len += sizeof(struct sadb_supported);
	}
1590

L
Linus Torvalds 已提交
1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
	len = enc_len + auth_len + sizeof(struct sadb_msg);

	skb = alloc_skb(len + 16, allocation);
	if (!skb)
		goto out_put_algs;

	hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
	pfkey_hdr_dup(hdr, orig);
	hdr->sadb_msg_errno = 0;
	hdr->sadb_msg_len = len / sizeof(uint64_t);

	if (auth_len) {
		struct sadb_supported *sp;
		struct sadb_alg *ap;

		sp = (struct sadb_supported *) skb_put(skb, auth_len);
		ap = (struct sadb_alg *) (sp + 1);

		sp->sadb_supported_len = auth_len / sizeof(uint64_t);
		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;

		for (i = 0; ; i++) {
			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
			if (!aalg)
				break;
1616 1617
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
			if (aalg->available)
				*ap++ = aalg->desc;
		}
	}

	if (enc_len) {
		struct sadb_supported *sp;
		struct sadb_alg *ap;

		sp = (struct sadb_supported *) skb_put(skb, enc_len);
		ap = (struct sadb_alg *) (sp + 1);

		sp->sadb_supported_len = enc_len / sizeof(uint64_t);
		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;

		for (i = 0; ; i++) {
			struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
			if (!ealg)
				break;
1637 1638
			if (!ealg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1639 1640 1641 1642 1643 1644 1645 1646 1647
			if (ealg->available)
				*ap++ = ealg->desc;
		}
	}

out_put_algs:
	return skb;
}

1648
static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	struct sk_buff *supp_skb;

	if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
		return -EINVAL;

	if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
		if (pfk->registered&(1<<hdr->sadb_msg_satype))
			return -EEXIST;
		pfk->registered |= (1<<hdr->sadb_msg_satype);
	}

	xfrm_probe_algs();
1663

L
Linus Torvalds 已提交
1664 1665 1666 1667 1668 1669 1670 1671
	supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
	if (!supp_skb) {
		if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
			pfk->registered &= ~(1<<hdr->sadb_msg_satype);

		return -ENOBUFS;
	}

A
Alexey Dobriyan 已提交
1672
	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
L
Linus Torvalds 已提交
1673 1674 1675 1676

	return 0;
}

1677
static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
	if (!skb)
		return -ENOBUFS;

	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	memcpy(hdr, ihdr, sizeof(struct sadb_msg));
	hdr->sadb_msg_errno = (uint8_t) 0;
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));

	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
}

1694
static int key_notify_sa_flush(const struct km_event *c)
1695 1696 1697 1698 1699 1700 1701 1702
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
	if (!skb)
		return -ENOBUFS;
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1703
	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
J
Jerome Borsboom 已提交
1704
	hdr->sadb_msg_type = SADB_FLUSH;
1705
	hdr->sadb_msg_seq = c->seq;
1706
	hdr->sadb_msg_pid = c->portid;
1707 1708 1709
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_errno = (uint8_t) 0;
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1710
	hdr->sadb_msg_reserved = 0;
1711

A
Alexey Dobriyan 已提交
1712
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1713 1714 1715 1716

	return 0;
}

1717
static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1718
{
A
Alexey Dobriyan 已提交
1719
	struct net *net = sock_net(sk);
1720
	unsigned int proto;
1721
	struct km_event c;
1722
	int err, err2;
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727

	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
	if (proto == 0)
		return -EINVAL;

1728
	err = xfrm_state_flush(net, proto, true);
1729
	err2 = unicast_flush_resp(sk, hdr);
1730 1731 1732
	if (err || err2) {
		if (err == -ESRCH) /* empty table - go quietly */
			err = 0;
1733
		return err ? err : err2;
1734
	}
1735

1736
	c.data.proto = proto;
1737
	c.seq = hdr->sadb_msg_seq;
1738
	c.portid = hdr->sadb_msg_pid;
1739
	c.event = XFRM_MSG_FLUSHSA;
A
Alexey Dobriyan 已提交
1740
	c.net = net;
1741
	km_state_notify(NULL, &c);
L
Linus Torvalds 已提交
1742 1743 1744 1745 1746 1747

	return 0;
}

static int dump_sa(struct xfrm_state *x, int count, void *ptr)
{
1748
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
1749 1750 1751
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;

1752 1753 1754
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

1755
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1756 1757 1758 1759
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
1760
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
1761 1762 1763 1764
	out_hdr->sadb_msg_type = SADB_DUMP;
	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_reserved = 0;
H
Herbert Xu 已提交
1765
	out_hdr->sadb_msg_seq = count + 1;
1766
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
1767 1768 1769

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
1770
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
1771 1772
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
1773 1774 1775
	return 0;
}

1776 1777
static int pfkey_dump_sa(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
1778 1779
	struct net *net = sock_net(&pfk->sk);
	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1780 1781 1782 1783
}

static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
1784 1785 1786
	struct net *net = sock_net(&pfk->sk);

	xfrm_state_walk_done(&pfk->dump.u.state, net);
1787 1788
}

1789
static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1790 1791
{
	u8 proto;
1792
	struct xfrm_address_filter *filter = NULL;
1793 1794 1795 1796
	struct pfkey_sock *pfk = pfkey_sk(sk);

	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
1797 1798 1799 1800 1801

	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
	if (proto == 0)
		return -EINVAL;

1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
	if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
		struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];

		filter = kmalloc(sizeof(*filter), GFP_KERNEL);
		if (filter == NULL)
			return -ENOMEM;

		memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
		       sizeof(xfrm_address_t));
		memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
		       sizeof(xfrm_address_t));
		filter->family = xfilter->sadb_x_filter_family;
		filter->splen = xfilter->sadb_x_filter_splen;
		filter->dplen = xfilter->sadb_x_filter_dplen;
	}

1818
	pfk->dump.msg_version = hdr->sadb_msg_version;
1819
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1820 1821
	pfk->dump.dump = pfkey_dump_sa;
	pfk->dump.done = pfkey_dump_sa_done;
1822
	xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1823

1824
	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
1825 1826
}

1827
static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1828 1829 1830
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;
1831
	bool reset_errno = false;
L
Linus Torvalds 已提交
1832 1833

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1834
		reset_errno = true;
L
Linus Torvalds 已提交
1835 1836 1837 1838
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
	if (reset_errno && skb_cloned(skb))
		skb = skb_copy(skb, GFP_KERNEL);
	else
		skb = skb_clone(skb, GFP_KERNEL);

	if (reset_errno && skb) {
		struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
		new_hdr->sadb_msg_errno = 0;
	}

	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
L
Linus Torvalds 已提交
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
	return 0;
}

static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
	int i;
	u32 reqid = *(u32*)ptr;

	for (i=0; i<xp->xfrm_nr; i++) {
		if (xp->xfrm_vec[i].reqid == reqid)
			return -EEXIST;
	}
	return 0;
}

A
Alexey Dobriyan 已提交
1865
static u32 gen_reqid(struct net *net)
L
Linus Torvalds 已提交
1866
{
1867
	struct xfrm_policy_walk walk;
L
Linus Torvalds 已提交
1868
	u32 start;
1869
	int rc;
L
Linus Torvalds 已提交
1870 1871 1872 1873 1874 1875 1876
	static u32 reqid = IPSEC_MANUAL_REQID_MAX;

	start = reqid;
	do {
		++reqid;
		if (reqid == 0)
			reqid = IPSEC_MANUAL_REQID_MAX+1;
1877
		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
A
Alexey Dobriyan 已提交
1878
		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
F
Fan Du 已提交
1879
		xfrm_policy_walk_done(&walk, net);
1880
		if (rc != -EEXIST)
L
Linus Torvalds 已提交
1881 1882 1883 1884 1885 1886 1887 1888
			return reqid;
	} while (reqid != start);
	return 0;
}

static int
parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
{
A
Alexey Dobriyan 已提交
1889
	struct net *net = xp_net(xp);
L
Linus Torvalds 已提交
1890
	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1891
	int mode;
L
Linus Torvalds 已提交
1892 1893 1894 1895 1896 1897 1898 1899

	if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
		return -ELOOP;

	if (rq->sadb_x_ipsecrequest_mode == 0)
		return -EINVAL;

	t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1900 1901 1902
	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	t->mode = mode;
L
Linus Torvalds 已提交
1903 1904 1905 1906 1907 1908
	if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
		t->optional = 1;
	else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
		t->reqid = rq->sadb_x_ipsecrequest_reqid;
		if (t->reqid > IPSEC_MANUAL_REQID_MAX)
			t->reqid = 0;
A
Alexey Dobriyan 已提交
1909
		if (!t->reqid && !(t->reqid = gen_reqid(net)))
L
Linus Torvalds 已提交
1910 1911 1912 1913
			return -ENOBUFS;
	}

	/* addresses present only in tunnel mode */
1914
	if (t->mode == XFRM_MODE_TUNNEL) {
1915 1916 1917 1918 1919 1920
		u8 *sa = (u8 *) (rq + 1);
		int family, socklen;

		family = pfkey_sockaddr_extract((struct sockaddr *)sa,
						&t->saddr);
		if (!family)
L
Linus Torvalds 已提交
1921
			return -EINVAL;
1922 1923 1924 1925 1926 1927

		socklen = pfkey_sockaddr_len(family);
		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
					   &t->id.daddr) != family)
			return -EINVAL;
		t->encap_family = family;
1928 1929 1930
	} else
		t->encap_family = xp->family;

L
Linus Torvalds 已提交
1931
	/* No way to set this via kame pfkey */
1932
	t->allalgs = 1;
L
Linus Torvalds 已提交
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
	xp->xfrm_nr++;
	return 0;
}

static int
parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
{
	int err;
	int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
	struct sadb_x_ipsecrequest *rq = (void*)(pol+1);

1944 1945 1946
	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
		return -EINVAL;

L
Linus Torvalds 已提交
1947 1948 1949 1950 1951 1952 1953 1954 1955
	while (len >= sizeof(struct sadb_x_ipsecrequest)) {
		if ((err = parse_ipsecrequest(xp, rq)) < 0)
			return err;
		len -= rq->sadb_x_ipsecrequest_len;
		rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
	}
	return 0;
}

1956
static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
{
  struct xfrm_sec_ctx *xfrm_ctx = xp->security;

	if (xfrm_ctx) {
		int len = sizeof(struct sadb_x_sec_ctx);
		len += xfrm_ctx->ctx_len;
		return PFKEY_ALIGN8(len);
	}
	return 0;
}

1968
static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1969
{
1970
	const struct xfrm_tmpl *t;
L
Linus Torvalds 已提交
1971
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1972 1973 1974 1975 1976
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
1977
		socklen += pfkey_sockaddr_len(t->encap_family);
1978
	}
L
Linus Torvalds 已提交
1979 1980 1981

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
1982
		(sizeof(struct sadb_address) * 2) +
L
Linus Torvalds 已提交
1983 1984
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
1985 1986
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
1987
		pfkey_xfrm_policy2sec_ctx_size(xp);
L
Linus Torvalds 已提交
1988 1989
}

1990
static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
{
	struct sk_buff *skb;
	int size;

	size = pfkey_xfrm_policy2msg_size(xp);

	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return ERR_PTR(-ENOBUFS);

	return skb;
}

2004
static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
L
Linus Torvalds 已提交
2005 2006 2007 2008 2009
{
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_lifetime *lifetime;
	struct sadb_x_policy *pol;
2010 2011
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
L
Linus Torvalds 已提交
2012 2013 2014
	int i;
	int size;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2015
	int socklen = pfkey_sockaddr_len(xp->family);
L
Linus Torvalds 已提交
2016 2017 2018 2019 2020 2021 2022 2023

	size = pfkey_xfrm_policy2msg_size(xp);

	/* call should fill header later */
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	memset(hdr, 0, size);	/* XXX do we need this ? */

	/* src address */
2024
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2025
					      sizeof(struct sadb_address)+sockaddr_size);
2026
	addr->sadb_address_len =
L
Linus Torvalds 已提交
2027 2028 2029 2030 2031 2032
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
	addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
	addr->sadb_address_reserved = 0;
2033 2034 2035 2036
	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
				 xp->selector.sport,
				 (struct sockaddr *) (addr + 1),
				 xp->family))
L
Linus Torvalds 已提交
2037 2038 2039
		BUG();

	/* dst address */
2040
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2041 2042 2043 2044 2045 2046
					      sizeof(struct sadb_address)+sockaddr_size);
	addr->sadb_address_len =
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2047
	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
L
Linus Torvalds 已提交
2048
	addr->sadb_address_reserved = 0;
2049 2050 2051 2052

	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
			    (struct sockaddr *) (addr + 1),
			    xp->family);
L
Linus Torvalds 已提交
2053 2054

	/* hard time */
2055
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2056 2057 2058 2059 2060 2061 2062 2063 2064
						     sizeof(struct sadb_lifetime));
	lifetime->sadb_lifetime_len =
		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
	lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
	lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
	/* soft time */
2065
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2066 2067 2068 2069 2070 2071 2072 2073 2074
						     sizeof(struct sadb_lifetime));
	lifetime->sadb_lifetime_len =
		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
	lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
	lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
	/* current time */
2075
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
						     sizeof(struct sadb_lifetime));
	lifetime->sadb_lifetime_len =
		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
	lifetime->sadb_lifetime_allocations = xp->curlft.packets;
	lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
	lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
	lifetime->sadb_lifetime_usetime = xp->curlft.use_time;

	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
	pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
	if (xp->action == XFRM_POLICY_ALLOW) {
		if (xp->xfrm_nr)
			pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
		else
			pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
	}
	pol->sadb_x_policy_dir = dir+1;
2096
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
2097 2098 2099 2100
	pol->sadb_x_policy_id = xp->index;
	pol->sadb_x_policy_priority = xp->priority;

	for (i=0; i<xp->xfrm_nr; i++) {
2101
		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
L
Linus Torvalds 已提交
2102 2103
		struct sadb_x_ipsecrequest *rq;
		int req_size;
2104
		int mode;
L
Linus Torvalds 已提交
2105 2106

		req_size = sizeof(struct sadb_x_ipsecrequest);
2107 2108 2109 2110
		if (t->mode == XFRM_MODE_TUNNEL) {
			socklen = pfkey_sockaddr_len(t->encap_family);
			req_size += socklen * 2;
		} else {
L
Linus Torvalds 已提交
2111
			size -= 2*socklen;
2112
		}
L
Linus Torvalds 已提交
2113 2114 2115 2116 2117
		rq = (void*)skb_put(skb, req_size);
		pol->sadb_x_policy_len += req_size/8;
		memset(rq, 0, sizeof(*rq));
		rq->sadb_x_ipsecrequest_len = req_size;
		rq->sadb_x_ipsecrequest_proto = t->id.proto;
2118 2119
		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
			return -EINVAL;
2120
		rq->sadb_x_ipsecrequest_mode = mode;
L
Linus Torvalds 已提交
2121 2122 2123 2124 2125 2126
		rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
		if (t->reqid)
			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
		if (t->optional)
			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
		rq->sadb_x_ipsecrequest_reqid = t->reqid;
2127

2128
		if (t->mode == XFRM_MODE_TUNNEL) {
2129 2130 2131 2132 2133 2134 2135
			u8 *sa = (void *)(rq + 1);
			pfkey_sockaddr_fill(&t->saddr, 0,
					    (struct sockaddr *)sa,
					    t->encap_family);
			pfkey_sockaddr_fill(&t->id.daddr, 0,
					    (struct sockaddr *) (sa + socklen),
					    t->encap_family);
L
Linus Torvalds 已提交
2136 2137
		}
	}
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152

	/* security context */
	if ((xfrm_ctx = xp->security)) {
		int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);

		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
		sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
		       xfrm_ctx->ctx_len);
	}

L
Linus Torvalds 已提交
2153 2154
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2155 2156

	return 0;
L
Linus Torvalds 已提交
2157 2158
}

2159
static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2160 2161 2162 2163 2164 2165
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	int err;

	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2166 2167 2168
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2169 2170 2171
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
2172 2173 2174 2175

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = PF_KEY_V2;

2176
	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2177 2178 2179 2180 2181
		out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
	else
		out_hdr->sadb_msg_type = event2poltype(c->event);
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_seq = c->seq;
2182
	out_hdr->sadb_msg_pid = c->portid;
A
Alexey Dobriyan 已提交
2183
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2184 2185 2186 2187
	return 0;

}

2188
static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
2189
{
A
Alexey Dobriyan 已提交
2190
	struct net *net = sock_net(sk);
2191
	int err = 0;
L
Linus Torvalds 已提交
2192 2193 2194 2195
	struct sadb_lifetime *lifetime;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2196
	struct km_event c;
2197
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
	    !ext_hdrs[SADB_X_EXT_POLICY-1])
		return -EINVAL;

	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
	if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
		return -EINVAL;
	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
		return -EINVAL;

A
Alexey Dobriyan 已提交
2210
	xp = xfrm_policy_alloc(net, GFP_KERNEL);
L
Linus Torvalds 已提交
2211 2212 2213 2214 2215 2216 2217
	if (xp == NULL)
		return -ENOBUFS;

	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
	xp->priority = pol->sadb_x_policy_priority;

J
Junwei Zhang 已提交
2218
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2219 2220 2221 2222 2223 2224
	xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
	xp->selector.family = xp->family;
	xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
	xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
	if (xp->selector.sport)
2225
		xp->selector.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2226

J
Junwei Zhang 已提交
2227
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
	pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
	xp->selector.prefixlen_d = sa->sadb_address_prefixlen;

	/* Amusing, we set this twice.  KAME apps appear to set same value
	 * in both addresses.
	 */
	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);

	xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
	if (xp->selector.dport)
2238
		xp->selector.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2239

J
Joe Perches 已提交
2240
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2241
	if (sec_ctx != NULL) {
2242
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2243 2244 2245 2246 2247 2248

		if (!uctx) {
			err = -ENOBUFS;
			goto out;
		}

2249
		err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2250 2251 2252 2253 2254 2255
		kfree(uctx);

		if (err)
			goto out;
	}

L
Linus Torvalds 已提交
2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
	xp->lft.soft_byte_limit = XFRM_INF;
	xp->lft.hard_byte_limit = XFRM_INF;
	xp->lft.soft_packet_limit = XFRM_INF;
	xp->lft.hard_packet_limit = XFRM_INF;
	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
		xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
		xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
		xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
		xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
	}
	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
		xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
		xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
		xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
		xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
	}
	xp->xfrm_nr = 0;
	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
	    (err = parse_ipsecrequests(xp, pol)) < 0)
		goto out;

	err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
				 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2279

2280
	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
J
Joy Latten 已提交
2281

2282 2283
	if (err)
		goto out;
L
Linus Torvalds 已提交
2284

2285
	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2286
		c.event = XFRM_MSG_UPDPOLICY;
2287
	else
2288
		c.event = XFRM_MSG_NEWPOLICY;
L
Linus Torvalds 已提交
2289

2290
	c.seq = hdr->sadb_msg_seq;
2291
	c.portid = hdr->sadb_msg_pid;
L
Linus Torvalds 已提交
2292

2293 2294
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
2295 2296 2297
	return 0;

out:
H
Herbert Xu 已提交
2298
	xp->walk.dead = 1;
2299
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
2300 2301 2302
	return err;
}

2303
static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
2304
{
A
Alexey Dobriyan 已提交
2305
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2306 2307 2308
	int err;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
2309
	struct xfrm_policy *xp;
L
Linus Torvalds 已提交
2310
	struct xfrm_selector sel;
2311
	struct km_event c;
2312
	struct sadb_x_sec_ctx *sec_ctx;
2313
	struct xfrm_sec_ctx *pol_ctx = NULL;
L
Linus Torvalds 已提交
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
	    !ext_hdrs[SADB_X_EXT_POLICY-1])
		return -EINVAL;

	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
		return -EINVAL;

	memset(&sel, 0, sizeof(sel));

J
Junwei Zhang 已提交
2326
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2327 2328 2329 2330 2331
	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
	sel.prefixlen_s = sa->sadb_address_prefixlen;
	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
	sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
	if (sel.sport)
2332
		sel.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2333

J
Junwei Zhang 已提交
2334
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2335 2336 2337 2338 2339
	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
	sel.prefixlen_d = sa->sadb_address_prefixlen;
	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
	sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
	if (sel.dport)
2340
		sel.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2341

J
Joe Perches 已提交
2342
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2343
	if (sec_ctx != NULL) {
2344
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2345 2346 2347 2348

		if (!uctx)
			return -ENOMEM;

2349
		err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2350 2351 2352
		kfree(uctx);
		if (err)
			return err;
2353
	}
J
Joy Latten 已提交
2354

2355
	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2356 2357 2358
				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
				   1, &err);
	security_xfrm_policy_free(pol_ctx);
L
Linus Torvalds 已提交
2359 2360 2361
	if (xp == NULL)
		return -ENOENT;

2362
	xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2363 2364

	if (err)
C
Catherine Zhang 已提交
2365
		goto out;
2366

2367
	c.seq = hdr->sadb_msg_seq;
2368
	c.portid = hdr->sadb_msg_pid;
2369
	c.data.byid = 0;
2370
	c.event = XFRM_MSG_DELPOLICY;
2371 2372
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);

C
Catherine Zhang 已提交
2373
out:
2374
	xfrm_pol_put(xp);
2375 2376
	if (err == 0)
		xfrm_garbage_collect(net);
2377 2378 2379
	return err;
}

2380
static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2381 2382 2383 2384 2385 2386
{
	int err;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	err = 0;

L
Linus Torvalds 已提交
2387 2388 2389 2390 2391
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err =  PTR_ERR(out_skb);
		goto out;
	}
2392 2393 2394
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
2395 2396 2397

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2398
	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
L
Linus Torvalds 已提交
2399 2400 2401 2402
	out_hdr->sadb_msg_satype = 0;
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
A
Alexey Dobriyan 已提交
2403
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
L
Linus Torvalds 已提交
2404 2405 2406 2407 2408 2409
	err = 0;

out:
	return err;
}

2410 2411 2412
#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_sockaddr_pair_size(sa_family_t family)
{
2413
	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2414 2415
}

2416
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2417 2418 2419
			       xfrm_address_t *saddr, xfrm_address_t *daddr,
			       u16 *family)
{
2420 2421
	int af, socklen;

2422
	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2423 2424
		return -EINVAL;

2425
	af = pfkey_sockaddr_extract(sa, saddr);
2426 2427 2428 2429
	if (!af)
		return -EINVAL;

	socklen = pfkey_sockaddr_len(af);
2430
	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2431
				   daddr) != af)
2432 2433
		return -EINVAL;

2434
	*family = af;
2435 2436 2437 2438 2439 2440 2441 2442
	return 0;
}

static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
				    struct xfrm_migrate *m)
{
	int err;
	struct sadb_x_ipsecrequest *rq2;
2443
	int mode;
2444 2445 2446 2447 2448 2449

	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
	    len < rq1->sadb_x_ipsecrequest_len)
		return -EINVAL;

	/* old endoints */
2450 2451 2452
	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
				  rq1->sadb_x_ipsecrequest_len,
				  &m->old_saddr, &m->old_daddr,
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
				  &m->old_family);
	if (err)
		return err;

	rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
	len -= rq1->sadb_x_ipsecrequest_len;

	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
	    len < rq2->sadb_x_ipsecrequest_len)
		return -EINVAL;

	/* new endpoints */
2465 2466 2467
	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
				  rq2->sadb_x_ipsecrequest_len,
				  &m->new_saddr, &m->new_daddr,
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477
				  &m->new_family);
	if (err)
		return err;

	if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
	    rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
	    rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
		return -EINVAL;

	m->proto = rq1->sadb_x_ipsecrequest_proto;
2478 2479 2480
	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	m->mode = mode;
2481 2482 2483 2484 2485 2486 2487
	m->reqid = rq1->sadb_x_ipsecrequest_reqid;

	return ((int)(rq1->sadb_x_ipsecrequest_len +
		      rq2->sadb_x_ipsecrequest_len));
}

static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2488
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2489 2490 2491 2492
{
	int i, len, ret, err = -EINVAL;
	u8 dir;
	struct sadb_address *sa;
2493
	struct sadb_x_kmaddress *kma;
2494 2495 2496 2497
	struct sadb_x_policy *pol;
	struct sadb_x_ipsecrequest *rq;
	struct xfrm_selector sel;
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2498
	struct xfrm_kmaddress k;
2499
	struct net *net = sock_net(sk);
2500 2501

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2502
				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2503 2504 2505 2506 2507
	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
		err = -EINVAL;
		goto out;
	}

2508
	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2509 2510 2511 2512 2513 2514 2515
	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];

	if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
		err = -EINVAL;
		goto out;
	}

2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
	if (kma) {
		/* convert sadb_x_kmaddress to xfrm_kmaddress */
		k.reserved = kma->sadb_x_kmaddress_reserved;
		ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
					  8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
					  &k.local, &k.remote, &k.family);
		if (ret < 0) {
			err = ret;
			goto out;
		}
	}

2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
	dir = pol->sadb_x_policy_dir - 1;
	memset(&sel, 0, sizeof(sel));

	/* set source address info of selector */
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
	sel.prefixlen_s = sa->sadb_address_prefixlen;
	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
	sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
	if (sel.sport)
A
Al Viro 已提交
2538
		sel.sport_mask = htons(0xffff);
2539 2540

	/* set destination address info of selector */
2541
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2542 2543 2544 2545 2546
	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
	sel.prefixlen_d = sa->sadb_address_prefixlen;
	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
	sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
	if (sel.dport)
A
Al Viro 已提交
2547
		sel.dport_mask = htons(0xffff);
2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571

	rq = (struct sadb_x_ipsecrequest *)(pol + 1);

	/* extract ipsecrequests */
	i = 0;
	len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);

	while (len > 0 && i < XFRM_MAX_DEPTH) {
		ret = ipsecrequests_to_migrate(rq, len, &m[i]);
		if (ret < 0) {
			err = ret;
			goto out;
		} else {
			rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
			len -= ret;
			i++;
		}
	}

	if (!i || len > 0) {
		err = -EINVAL;
		goto out;
	}

2572
	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2573
			    kma ? &k : NULL, net);
2574 2575 2576 2577 2578 2579

 out:
	return err;
}
#else
static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
S
Stephen Hemminger 已提交
2580
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2581 2582 2583 2584 2585 2586
{
	return -ENOPROTOOPT;
}
#endif


2587
static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
2588
{
A
Alexey Dobriyan 已提交
2589
	struct net *net = sock_net(sk);
2590
	unsigned int dir;
2591
	int err = 0, delete;
L
Linus Torvalds 已提交
2592 2593
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2594
	struct km_event c;
L
Linus Torvalds 已提交
2595 2596 2597 2598

	if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
		return -EINVAL;

2599 2600 2601 2602
	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

2603
	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2604
	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2605
			      dir, pol->sadb_x_policy_id, delete, &err);
L
Linus Torvalds 已提交
2606 2607 2608
	if (xp == NULL)
		return -ENOENT;

2609
	if (delete) {
2610
		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
L
Linus Torvalds 已提交
2611

2612 2613 2614
		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
2615
		c.portid = hdr->sadb_msg_pid;
2616
		c.data.byid = 1;
2617
		c.event = XFRM_MSG_DELPOLICY;
2618
		km_policy_notify(xp, dir, &c);
2619
	} else {
2620
		err = key_pol_get_resp(sk, xp, hdr, dir);
L
Linus Torvalds 已提交
2621 2622
	}

2623
out:
L
Linus Torvalds 已提交
2624
	xfrm_pol_put(xp);
2625 2626
	if (delete && err == 0)
		xfrm_garbage_collect(net);
L
Linus Torvalds 已提交
2627 2628 2629 2630 2631
	return err;
}

static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
2632
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
2633 2634
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2635
	int err;
L
Linus Torvalds 已提交
2636

2637 2638 2639
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

L
Linus Torvalds 已提交
2640 2641 2642 2643
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2644 2645 2646
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2647 2648

	out_hdr = (struct sadb_msg *) out_skb->data;
2649
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
2650 2651 2652
	out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
	out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
	out_hdr->sadb_msg_errno = 0;
H
Herbert Xu 已提交
2653
	out_hdr->sadb_msg_seq = count + 1;
2654
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
2655 2656 2657

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
2658
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
2659 2660
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
2661 2662 2663
	return 0;
}

2664 2665
static int pfkey_dump_sp(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
2666 2667
	struct net *net = sock_net(&pfk->sk);
	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2668 2669 2670 2671
}

static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
2672 2673 2674
	struct net *net = sock_net((struct sock *)pfk);

	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2675 2676
}

2677
static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
2678
{
2679
	struct pfkey_sock *pfk = pfkey_sk(sk);
2680

2681 2682
	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
2683

2684
	pfk->dump.msg_version = hdr->sadb_msg_version;
2685
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2686 2687 2688 2689 2690
	pfk->dump.dump = pfkey_dump_sp;
	pfk->dump.done = pfkey_dump_sp_done;
	xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);

	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
2691 2692
}

2693
static int key_notify_policy_flush(const struct km_event *c)
L
Linus Torvalds 已提交
2694 2695
{
	struct sk_buff *skb_out;
2696
	struct sadb_msg *hdr;
L
Linus Torvalds 已提交
2697

2698
	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
L
Linus Torvalds 已提交
2699 2700
	if (!skb_out)
		return -ENOBUFS;
2701
	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
J
Jerome Borsboom 已提交
2702
	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2703
	hdr->sadb_msg_seq = c->seq;
2704
	hdr->sadb_msg_pid = c->portid;
2705 2706
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_errno = (uint8_t) 0;
2707
	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2708
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2709
	hdr->sadb_msg_reserved = 0;
A
Alexey Dobriyan 已提交
2710
	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2711
	return 0;
L
Linus Torvalds 已提交
2712

2713 2714
}

2715
static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2716
{
A
Alexey Dobriyan 已提交
2717
	struct net *net = sock_net(sk);
2718
	struct km_event c;
2719
	int err, err2;
L
Linus Torvalds 已提交
2720

2721
	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2722
	err2 = unicast_flush_resp(sk, hdr);
2723 2724 2725 2726 2727
	if (err || err2) {
		if (err == -ESRCH) /* empty table - old silent behavior */
			return 0;
		return err;
	}
2728

2729
	c.data.type = XFRM_POLICY_TYPE_MAIN;
2730
	c.event = XFRM_MSG_FLUSHPOLICY;
2731
	c.portid = hdr->sadb_msg_pid;
2732
	c.seq = hdr->sadb_msg_seq;
A
Alexey Dobriyan 已提交
2733
	c.net = net;
2734
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
2735 2736 2737 2738 2739

	return 0;
}

typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2740
			     const struct sadb_msg *hdr, void * const *ext_hdrs);
M
Mathias Krause 已提交
2741
static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
L
Linus Torvalds 已提交
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763
	[SADB_RESERVED]		= pfkey_reserved,
	[SADB_GETSPI]		= pfkey_getspi,
	[SADB_UPDATE]		= pfkey_add,
	[SADB_ADD]		= pfkey_add,
	[SADB_DELETE]		= pfkey_delete,
	[SADB_GET]		= pfkey_get,
	[SADB_ACQUIRE]		= pfkey_acquire,
	[SADB_REGISTER]		= pfkey_register,
	[SADB_EXPIRE]		= NULL,
	[SADB_FLUSH]		= pfkey_flush,
	[SADB_DUMP]		= pfkey_dump,
	[SADB_X_PROMISC]	= pfkey_promisc,
	[SADB_X_PCHANGE]	= NULL,
	[SADB_X_SPDUPDATE]	= pfkey_spdadd,
	[SADB_X_SPDADD]		= pfkey_spdadd,
	[SADB_X_SPDDELETE]	= pfkey_spddelete,
	[SADB_X_SPDGET]		= pfkey_spdget,
	[SADB_X_SPDACQUIRE]	= NULL,
	[SADB_X_SPDDUMP]	= pfkey_spddump,
	[SADB_X_SPDFLUSH]	= pfkey_spdflush,
	[SADB_X_SPDSETIDX]	= pfkey_spdadd,
	[SADB_X_SPDDELETE2]	= pfkey_spdget,
2764
	[SADB_X_MIGRATE]	= pfkey_migrate,
L
Linus Torvalds 已提交
2765 2766
};

2767
static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
L
Linus Torvalds 已提交
2768 2769 2770 2771 2772
{
	void *ext_hdrs[SADB_EXT_MAX];
	int err;

	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
A
Alexey Dobriyan 已提交
2773
			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
L
Linus Torvalds 已提交
2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811

	memset(ext_hdrs, 0, sizeof(ext_hdrs));
	err = parse_exthdrs(skb, hdr, ext_hdrs);
	if (!err) {
		err = -EOPNOTSUPP;
		if (pfkey_funcs[hdr->sadb_msg_type])
			err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
	}
	return err;
}

static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
{
	struct sadb_msg *hdr = NULL;

	if (skb->len < sizeof(*hdr)) {
		*errp = -EMSGSIZE;
	} else {
		hdr = (struct sadb_msg *) skb->data;
		if (hdr->sadb_msg_version != PF_KEY_V2 ||
		    hdr->sadb_msg_reserved != 0 ||
		    (hdr->sadb_msg_type <= SADB_RESERVED ||
		     hdr->sadb_msg_type > SADB_MAX)) {
			hdr = NULL;
			*errp = -EINVAL;
		} else if (hdr->sadb_msg_len != (skb->len /
						 sizeof(uint64_t)) ||
			   hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
						sizeof(uint64_t))) {
			hdr = NULL;
			*errp = -EMSGSIZE;
		} else {
			*errp = 0;
		}
	}
	return hdr;
}

2812 2813
static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2814
{
2815 2816 2817 2818 2819 2820
	unsigned int id = d->desc.sadb_alg_id;

	if (id >= sizeof(t->aalgos) * 8)
		return 0;

	return (t->aalgos >> id) & 1;
L
Linus Torvalds 已提交
2821 2822
}

2823 2824
static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2825
{
2826 2827 2828 2829 2830 2831
	unsigned int id = d->desc.sadb_alg_id;

	if (id >= sizeof(t->ealgos) * 8)
		return 0;

	return (t->ealgos >> id) & 1;
L
Linus Torvalds 已提交
2832 2833
}

2834
static int count_ah_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2835 2836 2837 2838
{
	int i, sz = 0;

	for (i = 0; ; i++) {
2839
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2840 2841
		if (!aalg)
			break;
2842 2843
		if (!aalg->pfkey_supported)
			continue;
L
Linus Torvalds 已提交
2844 2845 2846 2847 2848 2849
		if (aalg_tmpl_set(t, aalg) && aalg->available)
			sz += sizeof(struct sadb_comb);
	}
	return sz + sizeof(struct sadb_prop);
}

2850
static int count_esp_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2851 2852 2853 2854
{
	int i, k, sz = 0;

	for (i = 0; ; i++) {
2855
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2856 2857
		if (!ealg)
			break;
2858

2859 2860 2861
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2862 2863
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2864

L
Linus Torvalds 已提交
2865
		for (k = 1; ; k++) {
2866
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2867 2868
			if (!aalg)
				break;
2869

2870 2871 2872
			if (!aalg->pfkey_supported)
				continue;

L
Linus Torvalds 已提交
2873 2874 2875 2876 2877 2878 2879
			if (aalg_tmpl_set(t, aalg) && aalg->available)
				sz += sizeof(struct sadb_comb);
		}
	}
	return sz + sizeof(struct sadb_prop);
}

2880
static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891
{
	struct sadb_prop *p;
	int i;

	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
	p->sadb_prop_replay = 32;
	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));

	for (i = 0; ; i++) {
2892
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2893 2894 2895
		if (!aalg)
			break;

2896 2897 2898
		if (!aalg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914
		if (aalg_tmpl_set(t, aalg) && aalg->available) {
			struct sadb_comb *c;
			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
			memset(c, 0, sizeof(*c));
			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
			c->sadb_comb_hard_addtime = 24*60*60;
			c->sadb_comb_soft_addtime = 20*60*60;
			c->sadb_comb_hard_usetime = 8*60*60;
			c->sadb_comb_soft_usetime = 7*60*60;
		}
	}
}

2915
static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
{
	struct sadb_prop *p;
	int i, k;

	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
	p->sadb_prop_replay = 32;
	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));

	for (i=0; ; i++) {
2927
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2928 2929
		if (!ealg)
			break;
2930

2931 2932 2933
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2934 2935
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2936

L
Linus Torvalds 已提交
2937 2938
		for (k = 1; ; k++) {
			struct sadb_comb *c;
2939
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2940 2941
			if (!aalg)
				break;
2942 2943
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962
			if (!(aalg_tmpl_set(t, aalg) && aalg->available))
				continue;
			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
			memset(c, 0, sizeof(*c));
			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
			c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
			c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
			c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
			c->sadb_comb_hard_addtime = 24*60*60;
			c->sadb_comb_soft_addtime = 20*60*60;
			c->sadb_comb_hard_usetime = 8*60*60;
			c->sadb_comb_soft_usetime = 7*60*60;
		}
	}
}

2963
static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2964 2965 2966 2967
{
	return 0;
}

2968
static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
L
Linus Torvalds 已提交
2969 2970 2971
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2972 2973 2974
	int hard;
	int hsc;

2975
	hard = c->data.hard;
2976 2977 2978 2979
	if (hard)
		hsc = 2;
	else
		hsc = 1;
L
Linus Torvalds 已提交
2980

2981
	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
L
Linus Torvalds 已提交
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = PF_KEY_V2;
	out_hdr->sadb_msg_type = SADB_EXPIRE;
	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
	out_hdr->sadb_msg_errno = 0;
	out_hdr->sadb_msg_reserved = 0;
	out_hdr->sadb_msg_seq = 0;
	out_hdr->sadb_msg_pid = 0;

A
Alexey Dobriyan 已提交
2994
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
2995 2996 2997
	return 0;
}

2998
static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2999
{
A
Alexey Dobriyan 已提交
3000
	struct net *net = x ? xs_net(x) : c->net;
A
Alexey Dobriyan 已提交
3001 3002 3003
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

	if (atomic_read(&net_pfkey->socks_nr) == 0)
3004 3005
		return 0;

3006
	switch (c->event) {
3007
	case XFRM_MSG_EXPIRE:
3008
		return key_notify_sa_expire(x, c);
3009 3010 3011
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
3012
		return key_notify_sa(x, c);
3013
	case XFRM_MSG_FLUSHSA:
3014
		return key_notify_sa_flush(c);
J
Jamal Hadi Salim 已提交
3015 3016
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
3017
	default:
3018
		pr_err("pfkey: Unknown SA event %d\n", c->event);
3019 3020 3021 3022 3023 3024
		break;
	}

	return 0;
}

3025
static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3026
{
3027 3028 3029
	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
		return 0;

3030
	switch (c->event) {
3031
	case XFRM_MSG_POLEXPIRE:
3032
		return key_notify_policy_expire(xp, c);
3033 3034 3035
	case XFRM_MSG_DELPOLICY:
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
3036
		return key_notify_policy(xp, dir, c);
3037
	case XFRM_MSG_FLUSHPOLICY:
3038 3039
		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
			break;
3040 3041
		return key_notify_policy_flush(c);
	default:
3042
		pr_err("pfkey: Unknown policy event %d\n", c->event);
3043 3044 3045 3046 3047 3048
		break;
	}

	return 0;
}

L
Linus Torvalds 已提交
3049 3050 3051
static u32 get_acqseq(void)
{
	u32 res;
3052
	static atomic_t acqseq;
L
Linus Torvalds 已提交
3053

3054 3055 3056
	do {
		res = atomic_inc_return(&acqseq);
	} while (!res);
L
Linus Torvalds 已提交
3057 3058 3059
	return res;
}

3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077
static bool pfkey_is_alive(const struct km_event *c)
{
	struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
	struct sock *sk;
	bool is_alive = false;

	rcu_read_lock();
	sk_for_each_rcu(sk, &net_pfkey->table) {
		if (pfkey_sk(sk)->registered) {
			is_alive = true;
			break;
		}
	}
	rcu_read_unlock();

	return is_alive;
}

3078
static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
L
Linus Torvalds 已提交
3079 3080 3081 3082 3083 3084 3085
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_x_policy *pol;
	int sockaddr_size;
	int size;
3086 3087 3088
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
3089

L
Linus Torvalds 已提交
3090 3091 3092 3093 3094 3095 3096 3097
	sockaddr_size = pfkey_sockaddr_size(x->props.family);
	if (!sockaddr_size)
		return -EINVAL;

	size = sizeof(struct sadb_msg) +
		(sizeof(struct sadb_address) * 2) +
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy);
3098

L
Linus Torvalds 已提交
3099 3100 3101 3102 3103
	if (x->id.proto == IPPROTO_AH)
		size += count_ah_combs(t);
	else if (x->id.proto == IPPROTO_ESP)
		size += count_esp_combs(t);

3104 3105 3106 3107 3108
	if ((xfrm_ctx = x->security)) {
		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
		size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
	}

L
Linus Torvalds 已提交
3109 3110 3111
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3112

L
Linus Torvalds 已提交
3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_type = SADB_ACQUIRE;
	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_errno = 0;
	hdr->sadb_msg_reserved = 0;
	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
	hdr->sadb_msg_pid = 0;

	/* src address */
3124
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3125
					      sizeof(struct sadb_address)+sockaddr_size);
3126
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3127 3128 3129 3130 3131
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
	addr->sadb_address_proto = 0;
	addr->sadb_address_reserved = 0;
3132 3133 3134 3135 3136
	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->props.saddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
L
Linus Torvalds 已提交
3137
		BUG();
3138

L
Linus Torvalds 已提交
3139
	/* dst address */
3140
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3141 3142 3143 3144 3145 3146 3147
					      sizeof(struct sadb_address)+sockaddr_size);
	addr->sadb_address_len =
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
	addr->sadb_address_proto = 0;
	addr->sadb_address_reserved = 0;
3148 3149 3150 3151 3152
	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->id.daddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
L
Linus Torvalds 已提交
3153 3154 3155 3156 3157 3158
		BUG();

	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3159
	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3160
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
3161
	pol->sadb_x_policy_id = xp->index;
3162
	pol->sadb_x_policy_priority = xp->priority;
L
Linus Torvalds 已提交
3163 3164 3165 3166 3167 3168 3169

	/* Set sadb_comb's. */
	if (x->id.proto == IPPROTO_AH)
		dump_ah_combs(skb, t);
	else if (x->id.proto == IPPROTO_ESP)
		dump_esp_combs(skb, t);

3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183
	/* security context */
	if (xfrm_ctx) {
		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
				sizeof(struct sadb_x_sec_ctx) + ctx_size);
		sec_ctx->sadb_x_sec_len =
		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
		       xfrm_ctx->ctx_len);
	}

A
Alexey Dobriyan 已提交
3184
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3185 3186
}

3187
static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3188
						u8 *data, int len, int *dir)
L
Linus Torvalds 已提交
3189
{
A
Alexey Dobriyan 已提交
3190
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3191 3192
	struct xfrm_policy *xp;
	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3193
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
3194

3195
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
3196 3197 3198 3199 3200 3201
	case AF_INET:
		if (opt != IP_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
E
Eric Dumazet 已提交
3202
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222
	case AF_INET6:
		if (opt != IPV6_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
#endif
	default:
		*dir = -EINVAL;
		return NULL;
	}

	*dir = -EINVAL;

	if (len < sizeof(struct sadb_x_policy) ||
	    pol->sadb_x_policy_len*8 > len ||
	    pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
	    (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
		return NULL;

A
Alexey Dobriyan 已提交
3223
	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
L
Linus Torvalds 已提交
3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235
	if (xp == NULL) {
		*dir = -ENOBUFS;
		return NULL;
	}

	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);

	xp->lft.soft_byte_limit = XFRM_INF;
	xp->lft.hard_byte_limit = XFRM_INF;
	xp->lft.soft_packet_limit = XFRM_INF;
	xp->lft.hard_packet_limit = XFRM_INF;
3236
	xp->family = sk->sk_family;
L
Linus Torvalds 已提交
3237 3238 3239 3240 3241 3242

	xp->xfrm_nr = 0;
	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
	    (*dir = parse_ipsecrequests(xp, pol)) < 0)
		goto out;

3243 3244 3245 3246 3247 3248 3249 3250 3251
	/* security context too */
	if (len >= (pol->sadb_x_policy_len*8 +
	    sizeof(struct sadb_x_sec_ctx))) {
		char *p = (char *)pol;
		struct xfrm_user_sec_ctx *uctx;

		p += pol->sadb_x_policy_len*8;
		sec_ctx = (struct sadb_x_sec_ctx *)p;
		if (len < pol->sadb_x_policy_len*8 +
3252 3253
		    sec_ctx->sadb_x_sec_len) {
			*dir = -EINVAL;
3254
			goto out;
3255
		}
3256 3257
		if ((*dir = verify_sec_ctx_len(p)))
			goto out;
3258
		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3259
		*dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3260 3261 3262 3263 3264 3265
		kfree(uctx);

		if (*dir)
			goto out;
	}

L
Linus Torvalds 已提交
3266 3267 3268 3269
	*dir = pol->sadb_x_policy_dir-1;
	return xp;

out:
3270
	xp->walk.dead = 1;
3271
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
3272 3273 3274
	return NULL;
}

A
Al Viro 已提交
3275
static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
L
Linus Torvalds 已提交
3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_sa *sa;
	struct sadb_address *addr;
	struct sadb_x_nat_t_port *n_port;
	int sockaddr_size;
	int size;
	__u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
	struct xfrm_encap_tmpl *natt = NULL;

	sockaddr_size = pfkey_sockaddr_size(x->props.family);
	if (!sockaddr_size)
		return -EINVAL;

	if (!satype)
		return -EINVAL;

	if (!x->encap)
		return -EINVAL;

	natt = x->encap;

	/* Build an SADB_X_NAT_T_NEW_MAPPING message:
	 *
	 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
	 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
	 */
3304

L
Linus Torvalds 已提交
3305 3306 3307 3308 3309
	size = sizeof(struct sadb_msg) +
		sizeof(struct sadb_sa) +
		(sizeof(struct sadb_address) * 2) +
		(sockaddr_size * 2) +
		(sizeof(struct sadb_x_nat_t_port) * 2);
3310

L
Linus Torvalds 已提交
3311 3312 3313
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3314

L
Linus Torvalds 已提交
3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
	hdr->sadb_msg_satype = satype;
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_errno = 0;
	hdr->sadb_msg_reserved = 0;
	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
	hdr->sadb_msg_pid = 0;

	/* SA */
	sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
	sa->sadb_sa_exttype = SADB_EXT_SA;
	sa->sadb_sa_spi = x->id.spi;
	sa->sadb_sa_replay = 0;
	sa->sadb_sa_state = 0;
	sa->sadb_sa_auth = 0;
	sa->sadb_sa_encrypt = 0;
	sa->sadb_sa_flags = 0;

	/* ADDRESS_SRC (old addr) */
	addr = (struct sadb_address*)
		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3339
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3340 3341 3342 3343 3344
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
	addr->sadb_address_proto = 0;
	addr->sadb_address_reserved = 0;
3345 3346 3347 3348 3349
	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->props.saddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
L
Linus Torvalds 已提交
3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361
		BUG();

	/* NAT_T_SPORT (old port) */
	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
	n_port->sadb_x_nat_t_port_port = natt->encap_sport;
	n_port->sadb_x_nat_t_port_reserved = 0;

	/* ADDRESS_DST (new addr) */
	addr = (struct sadb_address*)
		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3362
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3363 3364 3365 3366 3367
		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
	addr->sadb_address_proto = 0;
	addr->sadb_address_reserved = 0;
3368 3369 3370 3371 3372
	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(ipaddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
L
Linus Torvalds 已提交
3373 3374 3375 3376 3377 3378 3379 3380 3381
		BUG();

	/* NAT_T_DPORT (new port) */
	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
	n_port->sadb_x_nat_t_port_port = sport;
	n_port->sadb_x_nat_t_port_reserved = 0;

A
Alexey Dobriyan 已提交
3382
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3383 3384
}

3385 3386
#ifdef CONFIG_NET_KEY_MIGRATE
static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3387
			    const struct xfrm_selector *sel)
3388 3389 3390 3391 3392 3393 3394 3395 3396 3397
{
	struct sadb_address *addr;
	addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
	addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
	addr->sadb_address_exttype = type;
	addr->sadb_address_proto = sel->proto;
	addr->sadb_address_reserved = 0;

	switch (type) {
	case SADB_EXT_ADDRESS_SRC:
3398 3399 3400 3401
		addr->sadb_address_prefixlen = sel->prefixlen_s;
		pfkey_sockaddr_fill(&sel->saddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3402 3403
		break;
	case SADB_EXT_ADDRESS_DST:
3404 3405 3406 3407
		addr->sadb_address_prefixlen = sel->prefixlen_d;
		pfkey_sockaddr_fill(&sel->daddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3408 3409 3410 3411 3412 3413 3414 3415
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

3416

3417
static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441
{
	struct sadb_x_kmaddress *kma;
	u8 *sa;
	int family = k->family;
	int socklen = pfkey_sockaddr_len(family);
	int size_req;

	size_req = (sizeof(struct sadb_x_kmaddress) +
		    pfkey_sockaddr_pair_size(family));

	kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
	memset(kma, 0, size_req);
	kma->sadb_x_kmaddress_len = size_req / 8;
	kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
	kma->sadb_x_kmaddress_reserved = k->reserved;

	sa = (u8 *)(kma + 1);
	if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
		return -EINVAL;

	return 0;
}

3442 3443 3444
static int set_ipsecrequest(struct sk_buff *skb,
			    uint8_t proto, uint8_t mode, int level,
			    uint32_t reqid, uint8_t family,
3445
			    const xfrm_address_t *src, const xfrm_address_t *dst)
3446 3447
{
	struct sadb_x_ipsecrequest *rq;
3448 3449
	u8 *sa;
	int socklen = pfkey_sockaddr_len(family);
3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462
	int size_req;

	size_req = sizeof(struct sadb_x_ipsecrequest) +
		   pfkey_sockaddr_pair_size(family);

	rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
	memset(rq, 0, size_req);
	rq->sadb_x_ipsecrequest_len = size_req;
	rq->sadb_x_ipsecrequest_proto = proto;
	rq->sadb_x_ipsecrequest_mode = mode;
	rq->sadb_x_ipsecrequest_level = level;
	rq->sadb_x_ipsecrequest_reqid = reqid;

3463 3464 3465
	sa = (u8 *) (rq + 1);
	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3466 3467 3468 3469 3470 3471 3472
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_NET_KEY_MIGRATE
3473 3474 3475
static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
			      const struct xfrm_migrate *m, int num_bundles,
			      const struct xfrm_kmaddress *k)
3476 3477 3478 3479 3480 3481 3482 3483
{
	int i;
	int sasize_sel;
	int size = 0;
	int size_pol = 0;
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_x_policy *pol;
3484
	const struct xfrm_migrate *mp;
3485 3486 3487 3488 3489 3490 3491

	if (type != XFRM_POLICY_TYPE_MAIN)
		return 0;

	if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
		return -EINVAL;

3492 3493 3494 3495 3496 3497
	if (k != NULL) {
		/* addresses for KM */
		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
				     pfkey_sockaddr_pair_size(k->family));
	}

3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533
	/* selector */
	sasize_sel = pfkey_sockaddr_size(sel->family);
	if (!sasize_sel)
		return -EINVAL;
	size += (sizeof(struct sadb_address) + sasize_sel) * 2;

	/* policy info */
	size_pol += sizeof(struct sadb_x_policy);

	/* ipsecrequests */
	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old locator pair */
		size_pol += sizeof(struct sadb_x_ipsecrequest) +
			    pfkey_sockaddr_pair_size(mp->old_family);
		/* new locator pair */
		size_pol += sizeof(struct sadb_x_ipsecrequest) +
			    pfkey_sockaddr_pair_size(mp->new_family);
	}

	size += sizeof(struct sadb_msg) + size_pol;

	/* alloc buffer */
	skb = alloc_skb(size, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_type = SADB_X_MIGRATE;
	hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
	hdr->sadb_msg_len = size / 8;
	hdr->sadb_msg_errno = 0;
	hdr->sadb_msg_reserved = 0;
	hdr->sadb_msg_seq = 0;
	hdr->sadb_msg_pid = 0;

3534 3535
	/* Addresses to be used by KM for negotiation, if ext is available */
	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3536
		goto err;
3537

3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549
	/* selector src */
	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);

	/* selector dst */
	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);

	/* policy information */
	pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
	pol->sadb_x_policy_len = size_pol / 8;
	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
	pol->sadb_x_policy_dir = dir + 1;
3550
	pol->sadb_x_policy_reserved = 0;
3551 3552 3553 3554 3555
	pol->sadb_x_policy_id = 0;
	pol->sadb_x_policy_priority = 0;

	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old ipsecrequest */
3556 3557
		int mode = pfkey_mode_from_xfrm(mp->mode);
		if (mode < 0)
3558
			goto err;
3559
		if (set_ipsecrequest(skb, mp->proto, mode,
3560 3561
				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->old_family,
3562 3563
				     &mp->old_saddr, &mp->old_daddr) < 0)
			goto err;
3564 3565

		/* new ipsecrequest */
3566
		if (set_ipsecrequest(skb, mp->proto, mode,
3567 3568
				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->new_family,
3569 3570
				     &mp->new_saddr, &mp->new_daddr) < 0)
			goto err;
3571 3572 3573
	}

	/* broadcast migrate message to sockets */
A
Alexey Dobriyan 已提交
3574
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3575 3576

	return 0;
3577 3578 3579 3580

err:
	kfree_skb(skb);
	return -EINVAL;
3581 3582
}
#else
3583 3584 3585
static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
			      const struct xfrm_migrate *m, int num_bundles,
			      const struct xfrm_kmaddress *k)
3586 3587 3588 3589 3590
{
	return -ENOPROTOOPT;
}
#endif

L
Linus Torvalds 已提交
3591 3592 3593 3594 3595 3596 3597
static int pfkey_sendmsg(struct kiocb *kiocb,
			 struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb = NULL;
	struct sadb_msg *hdr = NULL;
	int err;
F
Fan Du 已提交
3598
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3599 3600 3601 3602 3603 3604

	err = -EOPNOTSUPP;
	if (msg->msg_flags & MSG_OOB)
		goto out;

	err = -EMSGSIZE;
3605
	if ((unsigned int)len > sk->sk_sndbuf - 32)
L
Linus Torvalds 已提交
3606 3607 3608 3609 3610 3611 3612 3613
		goto out;

	err = -ENOBUFS;
	skb = alloc_skb(len, GFP_KERNEL);
	if (skb == NULL)
		goto out;

	err = -EFAULT;
A
Al Viro 已提交
3614
	if (memcpy_from_msg(skb_put(skb,len), msg, len))
L
Linus Torvalds 已提交
3615 3616 3617 3618 3619 3620
		goto out;

	hdr = pfkey_get_base_msg(skb, &err);
	if (!hdr)
		goto out;

F
Fan Du 已提交
3621
	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3622
	err = pfkey_process(sk, skb, hdr);
F
Fan Du 已提交
3623
	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3624 3625 3626 3627

out:
	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
		err = 0;
3628
	kfree_skb(skb);
L
Linus Torvalds 已提交
3629 3630 3631 3632 3633 3634 3635 3636 3637

	return err ? : len;
}

static int pfkey_recvmsg(struct kiocb *kiocb,
			 struct socket *sock, struct msghdr *msg, size_t len,
			 int flags)
{
	struct sock *sk = sock->sk;
3638
	struct pfkey_sock *pfk = pfkey_sk(sk);
L
Linus Torvalds 已提交
3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655
	struct sk_buff *skb;
	int copied, err;

	err = -EINVAL;
	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
		goto out;

	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
	if (skb == NULL)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

3656
	skb_reset_transport_header(skb);
3657
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
Linus Torvalds 已提交
3658 3659 3660
	if (err)
		goto out_free;

3661
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
3662 3663 3664

	err = (flags & MSG_TRUNC) ? skb->len : copied;

3665 3666 3667 3668
	if (pfk->dump.dump != NULL &&
	    3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
		pfkey_do_dump(pfk);

L
Linus Torvalds 已提交
3669 3670 3671 3672 3673 3674
out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

3675
static const struct proto_ops pfkey_ops = {
L
Linus Torvalds 已提交
3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698
	.family		=	PF_KEY,
	.owner		=	THIS_MODULE,
	/* Operations that make no sense on pfkey sockets. */
	.bind		=	sock_no_bind,
	.connect	=	sock_no_connect,
	.socketpair	=	sock_no_socketpair,
	.accept		=	sock_no_accept,
	.getname	=	sock_no_getname,
	.ioctl		=	sock_no_ioctl,
	.listen		=	sock_no_listen,
	.shutdown	=	sock_no_shutdown,
	.setsockopt	=	sock_no_setsockopt,
	.getsockopt	=	sock_no_getsockopt,
	.mmap		=	sock_no_mmap,
	.sendpage	=	sock_no_sendpage,

	/* Now the operations that really occur. */
	.release	=	pfkey_release,
	.poll		=	datagram_poll,
	.sendmsg	=	pfkey_sendmsg,
	.recvmsg	=	pfkey_recvmsg,
};

3699
static const struct net_proto_family pfkey_family_ops = {
L
Linus Torvalds 已提交
3700 3701 3702 3703 3704 3705
	.family	=	PF_KEY,
	.create	=	pfkey_create,
	.owner	=	THIS_MODULE,
};

#ifdef CONFIG_PROC_FS
3706
static int pfkey_seq_show(struct seq_file *f, void *v)
L
Linus Torvalds 已提交
3707
{
3708
	struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
3709

3710 3711 3712
	if (v == SEQ_START_TOKEN)
		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
	else
D
Dan Rosenberg 已提交
3713
		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3714 3715
			       s,
			       atomic_read(&s->sk_refcnt),
3716 3717
			       sk_rmem_alloc_get(s),
			       sk_wmem_alloc_get(s),
3718
			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
L
Linus Torvalds 已提交
3719 3720
			       sock_i_ino(s)
			       );
3721 3722 3723 3724
	return 0;
}

static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3725
	__acquires(rcu)
3726
{
3727
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3728
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
L
Linus Torvalds 已提交
3729

S
stephen hemminger 已提交
3730 3731
	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3732 3733 3734 3735
}

static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
{
3736
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3737 3738
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

S
stephen hemminger 已提交
3739
	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3740
}
L
Linus Torvalds 已提交
3741

3742
static void pfkey_seq_stop(struct seq_file *f, void *v)
3743
	__releases(rcu)
3744
{
S
stephen hemminger 已提交
3745
	rcu_read_unlock();
3746
}
L
Linus Torvalds 已提交
3747

3748
static const struct seq_operations pfkey_seq_ops = {
3749 3750 3751 3752 3753
	.start	= pfkey_seq_start,
	.next	= pfkey_seq_next,
	.stop	= pfkey_seq_stop,
	.show	= pfkey_seq_show,
};
L
Linus Torvalds 已提交
3754

3755 3756
static int pfkey_seq_open(struct inode *inode, struct file *file)
{
3757 3758
	return seq_open_net(inode, file, &pfkey_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3759
}
3760

3761
static const struct file_operations pfkey_proc_ops = {
3762 3763 3764
	.open	 = pfkey_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
3765
	.release = seq_release_net,
3766 3767
};

3768
static int __net_init pfkey_init_proc(struct net *net)
3769
{
3770 3771
	struct proc_dir_entry *e;

3772
	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3773
	if (e == NULL)
3774
		return -ENOMEM;
3775 3776

	return 0;
3777 3778
}

3779
static void __net_exit pfkey_exit_proc(struct net *net)
3780
{
3781
	remove_proc_entry("pfkey", net->proc_net);
3782 3783
}
#else
3784
static inline int pfkey_init_proc(struct net *net)
3785 3786 3787 3788
{
	return 0;
}

3789
static inline void pfkey_exit_proc(struct net *net)
3790 3791
{
}
L
Linus Torvalds 已提交
3792 3793 3794 3795 3796 3797 3798 3799 3800
#endif

static struct xfrm_mgr pfkeyv2_mgr =
{
	.id		= "pfkeyv2",
	.notify		= pfkey_send_notify,
	.acquire	= pfkey_send_acquire,
	.compile_policy	= pfkey_compile_policy,
	.new_mapping	= pfkey_send_new_mapping,
3801
	.notify_policy	= pfkey_send_policy_notify,
3802
	.migrate	= pfkey_send_migrate,
3803
	.is_alive	= pfkey_is_alive,
L
Linus Torvalds 已提交
3804 3805
};

A
Alexey Dobriyan 已提交
3806 3807
static int __net_init pfkey_net_init(struct net *net)
{
3808
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
A
Alexey Dobriyan 已提交
3809 3810 3811 3812
	int rv;

	INIT_HLIST_HEAD(&net_pfkey->table);
	atomic_set(&net_pfkey->socks_nr, 0);
3813

3814
	rv = pfkey_init_proc(net);
A
Alexey Dobriyan 已提交
3815 3816 3817 3818 3819 3820 3821 3822

	return rv;
}

static void __net_exit pfkey_net_exit(struct net *net)
{
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

3823
	pfkey_exit_proc(net);
A
Alexey Dobriyan 已提交
3824 3825 3826 3827 3828 3829
	BUG_ON(!hlist_empty(&net_pfkey->table));
}

static struct pernet_operations pfkey_net_ops = {
	.init = pfkey_net_init,
	.exit = pfkey_net_exit,
3830 3831
	.id   = &pfkey_net_id,
	.size = sizeof(struct netns_pfkey),
A
Alexey Dobriyan 已提交
3832 3833
};

L
Linus Torvalds 已提交
3834 3835 3836 3837
static void __exit ipsec_pfkey_exit(void)
{
	xfrm_unregister_km(&pfkeyv2_mgr);
	sock_unregister(PF_KEY);
3838
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3839 3840 3841 3842 3843 3844 3845 3846 3847 3848
	proto_unregister(&key_proto);
}

static int __init ipsec_pfkey_init(void)
{
	int err = proto_register(&key_proto, 0);

	if (err != 0)
		goto out;

3849
	err = register_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3850 3851
	if (err != 0)
		goto out_unregister_key_proto;
3852 3853 3854
	err = sock_register(&pfkey_family_ops);
	if (err != 0)
		goto out_unregister_pernet;
L
Linus Torvalds 已提交
3855 3856
	err = xfrm_register_km(&pfkeyv2_mgr);
	if (err != 0)
3857
		goto out_sock_unregister;
L
Linus Torvalds 已提交
3858 3859
out:
	return err;
3860

L
Linus Torvalds 已提交
3861 3862
out_sock_unregister:
	sock_unregister(PF_KEY);
3863 3864
out_unregister_pernet:
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3865 3866 3867 3868 3869 3870 3871 3872 3873
out_unregister_key_proto:
	proto_unregister(&key_proto);
	goto out;
}

module_init(ipsec_pfkey_init);
module_exit(ipsec_pfkey_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_KEY);