af_key.c 101.0 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);
			sk->sk_data_ready(sk, (*skb2)->len);
			*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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};

/* 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;
		break;
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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)
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{
	struct xfrm_user_sec_ctx *uctx = NULL;
	int ctx_size = sec_ctx->sadb_x_ctx_len;

	uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);

	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;
		break;
	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;
		break;
	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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#if IS_ENABLED(CONFIG_IPV6)
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	case AF_INET6:
		return sizeof(struct sockaddr_in6);
#endif
	}
	return 0;
}

588 589
static
int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
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{
591
	switch (sa->sa_family) {
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	case AF_INET:
593
		xaddr->a4 =
594
			((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:
598
		memcpy(xaddr->a6,
599
		       &((struct sockaddr_in6 *)sa)->sin6_addr,
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		       sizeof(struct in6_addr));
		return AF_INET6;
#endif
	}
604 605 606 607
	return 0;
}

static
608
int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
609 610 611
{
	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
				      xaddr);
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}

614
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;

635
	family = ((const struct sockaddr *)(addr + 1))->sa_family;
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	switch (family) {
	case AF_INET:
638
		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;

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	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;
	}
}

692
static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
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					struct sockaddr *sa,
					unsigned short family)
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{
	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,
723
					      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;
802 803 804 805 806 807
	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 */
877
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
879
	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 */
886
	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

889 890 891 892 893
	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 */
897
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
899
	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;
903
	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

906 907 908 909 910 911
	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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913 914
	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
			     x->props.family)) {
915 916 917 918 919 920 921 922 923 924
		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) {
933
		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;
959 960 961 962 963
	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;
	}

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	/* 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
1011 1012 1013
	return skb;
}

1014

1015
static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 1017 1018 1019 1020 1021 1022 1023
{
	struct sk_buff *skb;

	skb = __pfkey_xfrm_state2msg(x, 1, 3);

	return skb;
}

1024
static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025 1026 1027 1028 1029
							  int hsc)
{
	return __pfkey_xfrm_state2msg(x, 0, hsc);
}

A
Alexey Dobriyan 已提交
1030
static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031 1032
						const struct sadb_msg *hdr,
						void * const *ext_hdrs)
L
Linus Torvalds 已提交
1033
{
1034
	struct xfrm_state *x;
1035 1036 1037 1038
	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
1039 1040
	uint16_t proto;
	int err;
1041

L
Linus Torvalds 已提交
1042

J
Joe Perches 已提交
1043
	sa = ext_hdrs[SADB_EXT_SA - 1];
L
Linus Torvalds 已提交
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 1073
	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.

1074
	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
L
Linus Torvalds 已提交
1075 1076 1077 1078 1079 1080 1081
	   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
1082
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
	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
1095
	x = xfrm_state_alloc(net);
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100
	if (x == NULL)
		return ERR_PTR(-ENOBUFS);

	x->id.proto = proto;
	x->id.spi = sa->sadb_sa_spi;
1101 1102
	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
					(sizeof(x->replay.bitmap) * 8));
L
Linus Torvalds 已提交
1103 1104 1105 1106
	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;
1107 1108
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
L
Linus Torvalds 已提交
1109

J
Joe Perches 已提交
1110
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
L
Linus Torvalds 已提交
1111 1112 1113 1114 1115 1116
	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
1117
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
L
Linus Torvalds 已提交
1118 1119 1120 1121 1122 1123
	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;
	}
1124

J
Joe Perches 已提交
1125
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

		if (!uctx)
			goto out;

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

		if (err)
			goto out;
	}

J
Joe Perches 已提交
1139
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1140 1141 1142
	if (sa->sadb_sa_auth) {
		int keysize = 0;
		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143
		if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
			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);
		}
1158
		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
L
Linus Torvalds 已提交
1159 1160 1161 1162 1163 1164
		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);
1165
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
				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);
1177
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
				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; */

1198
	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
L
Linus Torvalds 已提交
1199
						    &x->props.saddr);
1200
	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
L
Linus Torvalds 已提交
1201 1202 1203
				  &x->id.daddr);

	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204
		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205 1206 1207 1208 1209 1210
		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
1211 1212 1213 1214
		x->props.reqid = sa2->sadb_x_sa2_reqid;
	}

	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215
		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
L
Linus Torvalds 已提交
1216 1217 1218 1219 1220 1221

		/* 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;
	}

1222
	if (!x->sel.family)
1223 1224
		x->sel.family = x->props.family;

L
Linus Torvalds 已提交
1225
	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226
		const struct sadb_x_nat_t_type* n_type;
L
Linus Torvalds 已提交
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
		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]) {
1238
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1239 1240 1241 1242
				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]) {
1243
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1244 1245 1246
				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
1247
		memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
L
Linus Torvalds 已提交
1248 1249
	}

H
Herbert Xu 已提交
1250 1251
	err = xfrm_init_state(x);
	if (err)
L
Linus Torvalds 已提交
1252
		goto out;
H
Herbert Xu 已提交
1253

L
Linus Torvalds 已提交
1254 1255 1256 1257 1258 1259 1260 1261 1262
	x->km.seq = hdr->sadb_msg_seq;
	return x;

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

1263
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
1264 1265 1266 1267
{
	return -EOPNOTSUPP;
}

1268
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
1269
{
A
Alexey Dobriyan 已提交
1270
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1271 1272 1273 1274
	struct sk_buff *resp_skb;
	struct sadb_x_sa2 *sa2;
	struct sadb_address *saddr, *daddr;
	struct sadb_msg *out_hdr;
1275
	struct sadb_spirange *range;
L
Linus Torvalds 已提交
1276
	struct xfrm_state *x = NULL;
1277
	int mode;
1278 1279
	int err;
	u32 min_spi, max_spi;
L
Linus Torvalds 已提交
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
	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) {
1294 1295 1296
		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0)
			return -EINVAL;
L
Linus Torvalds 已提交
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
		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
1312
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
1313 1314 1315 1316 1317 1318 1319 1320
	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) {
1321
		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322
		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
L
Linus Torvalds 已提交
1323 1324 1325 1326 1327 1328
			xfrm_state_put(x);
			x = NULL;
		}
	}

	if (!x)
1329
		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
L
Linus Torvalds 已提交
1330 1331 1332 1333

	if (x == NULL)
		return -ENOENT;

1334 1335
	min_spi = 0x100;
	max_spi = 0x0fffffff;
L
Linus Torvalds 已提交
1336

1337 1338 1339 1340
	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
1341
	}
1342

1343 1344 1345 1346 1347 1348
	err = verify_spi_info(x->id.proto, min_spi, max_spi);
	if (err) {
		xfrm_state_put(x);
		return err;
	}

1349
	err = xfrm_alloc_spi(x, min_spi, max_spi);
1350
	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367

	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
1368
	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
L
Linus Torvalds 已提交
1369 1370 1371 1372

	return 0;
}

1373
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
1374
{
A
Alexey Dobriyan 已提交
1375
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1376 1377 1378 1379 1380 1381 1382 1383
	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;

1384
	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
L
Linus Torvalds 已提交
1385 1386 1387 1388
	if (x == NULL)
		return 0;

	spin_lock_bh(&x->lock);
1389
	if (x->km.state == XFRM_STATE_ACQ)
L
Linus Torvalds 已提交
1390
		x->km.state = XFRM_STATE_ERROR;
1391

L
Linus Torvalds 已提交
1392 1393 1394 1395 1396
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return 0;
}

1397 1398 1399
static inline int event2poltype(int event)
{
	switch (event) {
1400
	case XFRM_MSG_DELPOLICY:
1401
		return SADB_X_SPDDELETE;
1402
	case XFRM_MSG_NEWPOLICY:
1403
		return SADB_X_SPDADD;
1404
	case XFRM_MSG_UPDPOLICY:
1405
		return SADB_X_SPDUPDATE;
1406
	case XFRM_MSG_POLEXPIRE:
1407 1408
	//	return SADB_X_SPDEXPIRE;
	default:
1409
		pr_err("pfkey: Unknown policy event %d\n", event);
1410 1411 1412 1413 1414 1415 1416 1417 1418
		break;
	}

	return 0;
}

static inline int event2keytype(int event)
{
	switch (event) {
1419
	case XFRM_MSG_DELSA:
1420
		return SADB_DELETE;
1421
	case XFRM_MSG_NEWSA:
1422
		return SADB_ADD;
1423
	case XFRM_MSG_UPDSA:
1424
		return SADB_UPDATE;
1425
	case XFRM_MSG_EXPIRE:
1426 1427
		return SADB_EXPIRE;
	default:
1428
		pr_err("pfkey: Unknown SA event %d\n", event);
1429 1430 1431 1432 1433 1434 1435
		break;
	}

	return 0;
}

/* ADD/UPD/DEL */
1436
static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1437 1438 1439 1440
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

1441
	skb = pfkey_xfrm_state2msg(x);
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452

	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;
1453
	hdr->sadb_msg_pid = c->portid;
1454

A
Alexey Dobriyan 已提交
1455
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1456 1457 1458

	return 0;
}
L
Linus Torvalds 已提交
1459

1460
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
1461
{
A
Alexey Dobriyan 已提交
1462
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1463 1464
	struct xfrm_state *x;
	int err;
1465
	struct km_event c;
L
Linus Torvalds 已提交
1466

A
Alexey Dobriyan 已提交
1467
	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1468 1469 1470
	if (IS_ERR(x))
		return PTR_ERR(x);

1471
	xfrm_state_hold(x);
L
Linus Torvalds 已提交
1472 1473 1474 1475 1476
	if (hdr->sadb_msg_type == SADB_ADD)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

J
Joy Latten 已提交
1477
	xfrm_audit_state_add(x, err ? 0 : 1,
1478 1479
			     audit_get_loginuid(current),
			     audit_get_sessionid(current), 0);
J
Joy Latten 已提交
1480

L
Linus Torvalds 已提交
1481 1482
	if (err < 0) {
		x->km.state = XFRM_STATE_DEAD;
1483
		__xfrm_state_put(x);
1484
		goto out;
L
Linus Torvalds 已提交
1485 1486
	}

1487
	if (hdr->sadb_msg_type == SADB_ADD)
1488
		c.event = XFRM_MSG_NEWSA;
1489
	else
1490
		c.event = XFRM_MSG_UPDSA;
1491
	c.seq = hdr->sadb_msg_seq;
1492
	c.portid = hdr->sadb_msg_pid;
1493
	km_state_notify(x, &c);
1494
out:
1495 1496
	xfrm_state_put(x);
	return err;
L
Linus Torvalds 已提交
1497 1498
}

1499
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
1500
{
A
Alexey Dobriyan 已提交
1501
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1502
	struct xfrm_state *x;
1503 1504
	struct km_event c;
	int err;
L
Linus Torvalds 已提交
1505 1506 1507 1508 1509 1510

	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
1511
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1512 1513 1514
	if (x == NULL)
		return -ESRCH;

C
Catherine Zhang 已提交
1515 1516 1517
	if ((err = security_xfrm_state_delete(x)))
		goto out;

L
Linus Torvalds 已提交
1518
	if (xfrm_state_kern(x)) {
C
Catherine Zhang 已提交
1519 1520
		err = -EPERM;
		goto out;
L
Linus Torvalds 已提交
1521
	}
J
Joy Latten 已提交
1522

1523
	err = xfrm_state_delete(x);
J
Joy Latten 已提交
1524

C
Catherine Zhang 已提交
1525 1526
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
1527

1528
	c.seq = hdr->sadb_msg_seq;
1529
	c.portid = hdr->sadb_msg_pid;
1530
	c.event = XFRM_MSG_DELSA;
1531
	km_state_notify(x, &c);
C
Catherine Zhang 已提交
1532
out:
J
Joy Latten 已提交
1533
	xfrm_audit_state_delete(x, err ? 0 : 1,
1534 1535
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
1536
	xfrm_state_put(x);
L
Linus Torvalds 已提交
1537

1538
	return err;
L
Linus Torvalds 已提交
1539 1540
}

1541
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
1542
{
A
Alexey Dobriyan 已提交
1543
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
	__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
1554
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1555 1556 1557
	if (x == NULL)
		return -ESRCH;

1558
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1559 1560 1561 1562 1563 1564 1565
	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;
1566
	out_hdr->sadb_msg_type = SADB_GET;
L
Linus Torvalds 已提交
1567 1568 1569 1570 1571
	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
1572
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
L
Linus Torvalds 已提交
1573 1574 1575 1576

	return 0;
}

1577
static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
A
Al Viro 已提交
1578
					      gfp_t allocation)
L
Linus Torvalds 已提交
1579 1580 1581 1582 1583
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	int len, auth_len, enc_len, i;

1584
	auth_len = xfrm_count_pfkey_auth_supported();
L
Linus Torvalds 已提交
1585 1586 1587 1588
	if (auth_len) {
		auth_len *= sizeof(struct sadb_alg);
		auth_len += sizeof(struct sadb_supported);
	}
1589

1590
	enc_len = xfrm_count_pfkey_enc_supported();
L
Linus Torvalds 已提交
1591 1592 1593 1594
	if (enc_len) {
		enc_len *= sizeof(struct sadb_alg);
		enc_len += sizeof(struct sadb_supported);
	}
1595

L
Linus Torvalds 已提交
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
	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;
1621 1622
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641
			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;
1642 1643
			if (!ealg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1644 1645 1646 1647 1648 1649 1650 1651 1652
			if (ealg->available)
				*ap++ = ealg->desc;
		}
	}

out_put_algs:
	return skb;
}

1653
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
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667
{
	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();
1668

L
Linus Torvalds 已提交
1669 1670 1671 1672 1673 1674 1675 1676
	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
1677
	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
L
Linus Torvalds 已提交
1678 1679 1680 1681

	return 0;
}

1682
static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
{
	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));
}

1699
static int key_notify_sa_flush(const struct km_event *c)
1700 1701 1702 1703 1704 1705 1706 1707
{
	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));
1708
	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
J
Jerome Borsboom 已提交
1709
	hdr->sadb_msg_type = SADB_FLUSH;
1710
	hdr->sadb_msg_seq = c->seq;
1711
	hdr->sadb_msg_pid = c->portid;
1712 1713 1714
	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));
1715
	hdr->sadb_msg_reserved = 0;
1716

A
Alexey Dobriyan 已提交
1717
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1718 1719 1720 1721

	return 0;
}

1722
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
1723
{
A
Alexey Dobriyan 已提交
1724
	struct net *net = sock_net(sk);
1725
	unsigned int proto;
1726
	struct km_event c;
J
Joy Latten 已提交
1727
	struct xfrm_audit audit_info;
1728
	int err, err2;
L
Linus Torvalds 已提交
1729 1730 1731 1732 1733

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

1734
	audit_info.loginuid = audit_get_loginuid(current);
1735
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
1736
	audit_info.secid = 0;
A
Alexey Dobriyan 已提交
1737
	err = xfrm_state_flush(net, proto, &audit_info);
1738
	err2 = unicast_flush_resp(sk, hdr);
1739 1740 1741
	if (err || err2) {
		if (err == -ESRCH) /* empty table - go quietly */
			err = 0;
1742
		return err ? err : err2;
1743
	}
1744

1745
	c.data.proto = proto;
1746
	c.seq = hdr->sadb_msg_seq;
1747
	c.portid = hdr->sadb_msg_pid;
1748
	c.event = XFRM_MSG_FLUSHSA;
A
Alexey Dobriyan 已提交
1749
	c.net = net;
1750
	km_state_notify(NULL, &c);
L
Linus Torvalds 已提交
1751 1752 1753 1754 1755 1756

	return 0;
}

static int dump_sa(struct xfrm_state *x, int count, void *ptr)
{
1757
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
1758 1759 1760
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;

1761 1762 1763
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

1764
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1765 1766 1767 1768
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
1769
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
1770 1771 1772 1773
	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
1774
	out_hdr->sadb_msg_seq = count + 1;
1775
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
1776 1777 1778

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
1779
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
1780 1781
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
1782 1783 1784
	return 0;
}

1785 1786
static int pfkey_dump_sa(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
1787 1788
	struct net *net = sock_net(&pfk->sk);
	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1789 1790 1791 1792
}

static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
1793 1794 1795
	struct net *net = sock_net(&pfk->sk);

	xfrm_state_walk_done(&pfk->dump.u.state, net);
1796 1797
}

1798
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
1799 1800
{
	u8 proto;
1801 1802 1803 1804
	struct pfkey_sock *pfk = pfkey_sk(sk);

	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
1805 1806 1807 1808 1809

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

1810
	pfk->dump.msg_version = hdr->sadb_msg_version;
1811
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1812 1813 1814
	pfk->dump.dump = pfkey_dump_sa;
	pfk->dump.done = pfkey_dump_sa_done;
	xfrm_state_walk_init(&pfk->dump.u.state, proto);
1815

1816
	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
1817 1818
}

1819
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
1820 1821 1822
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;
1823
	bool reset_errno = false;
L
Linus Torvalds 已提交
1824 1825

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1826
		reset_errno = true;
L
Linus Torvalds 已提交
1827 1828 1829 1830
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
	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
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	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
1857
static u32 gen_reqid(struct net *net)
L
Linus Torvalds 已提交
1858
{
1859
	struct xfrm_policy_walk walk;
L
Linus Torvalds 已提交
1860
	u32 start;
1861
	int rc;
L
Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867 1868
	static u32 reqid = IPSEC_MANUAL_REQID_MAX;

	start = reqid;
	do {
		++reqid;
		if (reqid == 0)
			reqid = IPSEC_MANUAL_REQID_MAX+1;
1869
		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
A
Alexey Dobriyan 已提交
1870
		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
F
Fan Du 已提交
1871
		xfrm_policy_walk_done(&walk, net);
1872
		if (rc != -EEXIST)
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878 1879 1880
			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
1881
	struct net *net = xp_net(xp);
L
Linus Torvalds 已提交
1882
	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1883
	int mode;
L
Linus Torvalds 已提交
1884 1885 1886 1887 1888 1889 1890 1891

	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 */
1892 1893 1894
	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	t->mode = mode;
L
Linus Torvalds 已提交
1895 1896 1897 1898 1899 1900
	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
1901
		if (!t->reqid && !(t->reqid = gen_reqid(net)))
L
Linus Torvalds 已提交
1902 1903 1904 1905
			return -ENOBUFS;
	}

	/* addresses present only in tunnel mode */
1906
	if (t->mode == XFRM_MODE_TUNNEL) {
1907 1908 1909 1910 1911 1912
		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
1913
			return -EINVAL;
1914 1915 1916 1917 1918 1919

		socklen = pfkey_sockaddr_len(family);
		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
					   &t->id.daddr) != family)
			return -EINVAL;
		t->encap_family = family;
1920 1921 1922
	} else
		t->encap_family = xp->family;

L
Linus Torvalds 已提交
1923
	/* No way to set this via kame pfkey */
1924
	t->allalgs = 1;
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935
	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);

1936 1937 1938
	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
		return -EINVAL;

L
Linus Torvalds 已提交
1939 1940 1941 1942 1943 1944 1945 1946 1947
	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;
}

1948
static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
{
  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;
}

1960
static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1961
{
1962
	const struct xfrm_tmpl *t;
L
Linus Torvalds 已提交
1963
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1964 1965 1966 1967 1968
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
1969
		socklen += pfkey_sockaddr_len(t->encap_family);
1970
	}
L
Linus Torvalds 已提交
1971 1972 1973

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
1974
		(sizeof(struct sadb_address) * 2) +
L
Linus Torvalds 已提交
1975 1976
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
1977 1978
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
1979
		pfkey_xfrm_policy2sec_ctx_size(xp);
L
Linus Torvalds 已提交
1980 1981
}

1982
static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
{
	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;
}

1996
static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
L
Linus Torvalds 已提交
1997 1998 1999 2000 2001
{
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_lifetime *lifetime;
	struct sadb_x_policy *pol;
2002 2003
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
L
Linus Torvalds 已提交
2004 2005 2006
	int i;
	int size;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2007
	int socklen = pfkey_sockaddr_len(xp->family);
L
Linus Torvalds 已提交
2008 2009 2010 2011 2012 2013 2014 2015

	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 */
2016
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2017
					      sizeof(struct sadb_address)+sockaddr_size);
2018
	addr->sadb_address_len =
L
Linus Torvalds 已提交
2019 2020 2021 2022 2023 2024
		(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;
2025 2026 2027 2028
	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
				 xp->selector.sport,
				 (struct sockaddr *) (addr + 1),
				 xp->family))
L
Linus Torvalds 已提交
2029 2030 2031
		BUG();

	/* dst address */
2032
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037 2038
					      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);
2039
	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
L
Linus Torvalds 已提交
2040
	addr->sadb_address_reserved = 0;
2041 2042 2043 2044

	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
			    (struct sockaddr *) (addr + 1),
			    xp->family);
L
Linus Torvalds 已提交
2045 2046

	/* hard time */
2047
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2048 2049 2050 2051 2052 2053 2054 2055 2056
						     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 */
2057
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2058 2059 2060 2061 2062 2063 2064 2065 2066
						     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 */
2067
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
						     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;
2088
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
2089 2090 2091 2092
	pol->sadb_x_policy_id = xp->index;
	pol->sadb_x_policy_priority = xp->priority;

	for (i=0; i<xp->xfrm_nr; i++) {
2093
		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
L
Linus Torvalds 已提交
2094 2095
		struct sadb_x_ipsecrequest *rq;
		int req_size;
2096
		int mode;
L
Linus Torvalds 已提交
2097 2098

		req_size = sizeof(struct sadb_x_ipsecrequest);
2099 2100 2101 2102
		if (t->mode == XFRM_MODE_TUNNEL) {
			socklen = pfkey_sockaddr_len(t->encap_family);
			req_size += socklen * 2;
		} else {
L
Linus Torvalds 已提交
2103
			size -= 2*socklen;
2104
		}
L
Linus Torvalds 已提交
2105 2106 2107 2108 2109
		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;
2110 2111
		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
			return -EINVAL;
2112
		rq->sadb_x_ipsecrequest_mode = mode;
L
Linus Torvalds 已提交
2113 2114 2115 2116 2117 2118
		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;
2119

2120
		if (t->mode == XFRM_MODE_TUNNEL) {
2121 2122 2123 2124 2125 2126 2127
			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
2128 2129
		}
	}
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144

	/* 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
2145 2146
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2147 2148

	return 0;
L
Linus Torvalds 已提交
2149 2150
}

2151
static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2152 2153 2154 2155 2156 2157
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	int err;

	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2158 2159 2160
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2161 2162 2163
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
2164 2165 2166 2167

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

2168
	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2169 2170 2171 2172 2173
		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;
2174
	out_hdr->sadb_msg_pid = c->portid;
A
Alexey Dobriyan 已提交
2175
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2176 2177 2178 2179
	return 0;

}

2180
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
2181
{
A
Alexey Dobriyan 已提交
2182
	struct net *net = sock_net(sk);
2183
	int err = 0;
L
Linus Torvalds 已提交
2184 2185 2186 2187
	struct sadb_lifetime *lifetime;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2188
	struct km_event c;
2189
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201

	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
2202
	xp = xfrm_policy_alloc(net, GFP_KERNEL);
L
Linus Torvalds 已提交
2203 2204 2205 2206 2207 2208 2209
	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
2210
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2211 2212 2213 2214 2215 2216
	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)
2217
		xp->selector.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2218

J
Junwei Zhang 已提交
2219
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229
	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)
2230
		xp->selector.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2231

J
Joe Perches 已提交
2232
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2233 2234 2235 2236 2237 2238 2239 2240
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

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

2241
		err = security_xfrm_policy_alloc(&xp->security, uctx);
2242 2243 2244 2245 2246 2247
		kfree(uctx);

		if (err)
			goto out;
	}

L
Linus Torvalds 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
	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);
2271

J
Joy Latten 已提交
2272
	xfrm_audit_policy_add(xp, err ? 0 : 1,
2273 2274
			      audit_get_loginuid(current),
			      audit_get_sessionid(current), 0);
J
Joy Latten 已提交
2275

2276 2277
	if (err)
		goto out;
L
Linus Torvalds 已提交
2278

2279
	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2280
		c.event = XFRM_MSG_UPDPOLICY;
2281
	else
2282
		c.event = XFRM_MSG_NEWPOLICY;
L
Linus Torvalds 已提交
2283

2284
	c.seq = hdr->sadb_msg_seq;
2285
	c.portid = hdr->sadb_msg_pid;
L
Linus Torvalds 已提交
2286

2287 2288
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
2289 2290 2291
	return 0;

out:
H
Herbert Xu 已提交
2292
	xp->walk.dead = 1;
2293
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
2294 2295 2296
	return err;
}

2297
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
2298
{
A
Alexey Dobriyan 已提交
2299
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2300 2301 2302
	int err;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
2303
	struct xfrm_policy *xp;
L
Linus Torvalds 已提交
2304
	struct xfrm_selector sel;
2305
	struct km_event c;
2306
	struct sadb_x_sec_ctx *sec_ctx;
2307
	struct xfrm_sec_ctx *pol_ctx = NULL;
L
Linus Torvalds 已提交
2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319

	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
2320
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2321 2322 2323 2324 2325
	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)
2326
		sel.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2327

J
Junwei Zhang 已提交
2328
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2329 2330 2331 2332 2333
	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)
2334
		sel.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2335

J
Joe Perches 已提交
2336
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2337 2338 2339 2340 2341 2342
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

		if (!uctx)
			return -ENOMEM;

2343
		err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2344 2345 2346
		kfree(uctx);
		if (err)
			return err;
2347
	}
J
Joy Latten 已提交
2348

2349
	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2350 2351 2352
				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
				   1, &err);
	security_xfrm_policy_free(pol_ctx);
L
Linus Torvalds 已提交
2353 2354 2355
	if (xp == NULL)
		return -ENOENT;

J
Joy Latten 已提交
2356
	xfrm_audit_policy_delete(xp, err ? 0 : 1,
2357 2358
				 audit_get_loginuid(current),
				 audit_get_sessionid(current), 0);
2359 2360

	if (err)
C
Catherine Zhang 已提交
2361
		goto out;
2362

2363
	c.seq = hdr->sadb_msg_seq;
2364
	c.portid = hdr->sadb_msg_pid;
2365
	c.data.byid = 0;
2366
	c.event = XFRM_MSG_DELPOLICY;
2367 2368
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);

C
Catherine Zhang 已提交
2369
out:
2370
	xfrm_pol_put(xp);
2371 2372
	if (err == 0)
		xfrm_garbage_collect(net);
2373 2374 2375
	return err;
}

2376
static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2377 2378 2379 2380 2381 2382
{
	int err;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	err = 0;

L
Linus Torvalds 已提交
2383 2384 2385 2386 2387
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err =  PTR_ERR(out_skb);
		goto out;
	}
2388 2389 2390
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
2391 2392 2393

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2394
	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
L
Linus Torvalds 已提交
2395 2396 2397 2398
	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
2399
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
L
Linus Torvalds 已提交
2400 2401 2402 2403 2404 2405
	err = 0;

out:
	return err;
}

2406 2407 2408
#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_sockaddr_pair_size(sa_family_t family)
{
2409
	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2410 2411
}

2412
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2413 2414 2415
			       xfrm_address_t *saddr, xfrm_address_t *daddr,
			       u16 *family)
{
2416 2417
	int af, socklen;

2418
	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2419 2420
		return -EINVAL;

2421
	af = pfkey_sockaddr_extract(sa, saddr);
2422 2423 2424 2425
	if (!af)
		return -EINVAL;

	socklen = pfkey_sockaddr_len(af);
2426
	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2427
				   daddr) != af)
2428 2429
		return -EINVAL;

2430
	*family = af;
2431 2432 2433 2434 2435 2436 2437 2438
	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;
2439
	int mode;
2440 2441 2442 2443 2444 2445

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

	/* old endoints */
2446 2447 2448
	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
				  rq1->sadb_x_ipsecrequest_len,
				  &m->old_saddr, &m->old_daddr,
2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
				  &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 */
2461 2462 2463
	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
				  rq2->sadb_x_ipsecrequest_len,
				  &m->new_saddr, &m->new_daddr,
2464 2465 2466 2467 2468 2469 2470 2471 2472 2473
				  &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;
2474 2475 2476
	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	m->mode = mode;
2477 2478 2479 2480 2481 2482 2483
	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,
2484
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2485 2486 2487 2488
{
	int i, len, ret, err = -EINVAL;
	u8 dir;
	struct sadb_address *sa;
2489
	struct sadb_x_kmaddress *kma;
2490 2491 2492 2493
	struct sadb_x_policy *pol;
	struct sadb_x_ipsecrequest *rq;
	struct xfrm_selector sel;
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2494
	struct xfrm_kmaddress k;
2495
	struct net *net = sock_net(sk);
2496 2497

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2498
				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2499 2500 2501 2502 2503
	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
		err = -EINVAL;
		goto out;
	}

2504
	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2505 2506 2507 2508 2509 2510 2511
	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];

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

2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523
	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;
		}
	}

2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
	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
2534
		sel.sport_mask = htons(0xffff);
2535 2536 2537 2538 2539 2540 2541 2542

	/* set destination address info of selector */
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
	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
2543
		sel.dport_mask = htons(0xffff);
2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567

	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;
	}

2568
	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2569
			    kma ? &k : NULL, net);
2570 2571 2572 2573 2574 2575

 out:
	return err;
}
#else
static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
S
Stephen Hemminger 已提交
2576
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2577 2578 2579 2580 2581 2582
{
	return -ENOPROTOOPT;
}
#endif


2583
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
2584
{
A
Alexey Dobriyan 已提交
2585
	struct net *net = sock_net(sk);
2586
	unsigned int dir;
2587
	int err = 0, delete;
L
Linus Torvalds 已提交
2588 2589
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2590
	struct km_event c;
L
Linus Torvalds 已提交
2591 2592 2593 2594

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

2595 2596 2597 2598
	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

2599
	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2600
	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2601
			      dir, pol->sadb_x_policy_id, delete, &err);
L
Linus Torvalds 已提交
2602 2603 2604
	if (xp == NULL)
		return -ENOENT;

2605
	if (delete) {
J
Joy Latten 已提交
2606
		xfrm_audit_policy_delete(xp, err ? 0 : 1,
2607 2608
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
L
Linus Torvalds 已提交
2609

2610 2611 2612
		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
2613
		c.portid = hdr->sadb_msg_pid;
2614
		c.data.byid = 1;
2615
		c.event = XFRM_MSG_DELPOLICY;
2616
		km_policy_notify(xp, dir, &c);
2617
	} else {
2618
		err = key_pol_get_resp(sk, xp, hdr, dir);
L
Linus Torvalds 已提交
2619 2620
	}

2621
out:
L
Linus Torvalds 已提交
2622
	xfrm_pol_put(xp);
2623 2624
	if (delete && err == 0)
		xfrm_garbage_collect(net);
L
Linus Torvalds 已提交
2625 2626 2627 2628 2629
	return err;
}

static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
2630
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
2631 2632
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2633
	int err;
L
Linus Torvalds 已提交
2634

2635 2636 2637
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

L
Linus Torvalds 已提交
2638 2639 2640 2641
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2642 2643 2644
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2645 2646

	out_hdr = (struct sadb_msg *) out_skb->data;
2647
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
2648 2649 2650
	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
2651
	out_hdr->sadb_msg_seq = count + 1;
2652
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
2653 2654 2655

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
2656
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
2657 2658
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
2659 2660 2661
	return 0;
}

2662 2663
static int pfkey_dump_sp(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
2664 2665
	struct net *net = sock_net(&pfk->sk);
	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2666 2667 2668 2669
}

static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
2670 2671 2672
	struct net *net = sock_net((struct sock *)pfk);

	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2673 2674
}

2675
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
2676
{
2677
	struct pfkey_sock *pfk = pfkey_sk(sk);
2678

2679 2680
	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
2681

2682
	pfk->dump.msg_version = hdr->sadb_msg_version;
2683
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2684 2685 2686 2687 2688
	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
2689 2690
}

2691
static int key_notify_policy_flush(const struct km_event *c)
L
Linus Torvalds 已提交
2692 2693
{
	struct sk_buff *skb_out;
2694
	struct sadb_msg *hdr;
L
Linus Torvalds 已提交
2695

2696
	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
L
Linus Torvalds 已提交
2697 2698
	if (!skb_out)
		return -ENOBUFS;
2699
	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
J
Jerome Borsboom 已提交
2700
	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2701
	hdr->sadb_msg_seq = c->seq;
2702
	hdr->sadb_msg_pid = c->portid;
2703 2704
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_errno = (uint8_t) 0;
2705
	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2706
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2707
	hdr->sadb_msg_reserved = 0;
A
Alexey Dobriyan 已提交
2708
	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2709
	return 0;
L
Linus Torvalds 已提交
2710

2711 2712
}

2713
static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2714
{
A
Alexey Dobriyan 已提交
2715
	struct net *net = sock_net(sk);
2716
	struct km_event c;
J
Joy Latten 已提交
2717
	struct xfrm_audit audit_info;
2718
	int err, err2;
L
Linus Torvalds 已提交
2719

2720
	audit_info.loginuid = audit_get_loginuid(current);
2721
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
2722
	audit_info.secid = 0;
A
Alexey Dobriyan 已提交
2723
	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2724
	err2 = unicast_flush_resp(sk, hdr);
2725 2726 2727 2728 2729
	if (err || err2) {
		if (err == -ESRCH) /* empty table - old silent behavior */
			return 0;
		return err;
	}
2730

2731
	c.data.type = XFRM_POLICY_TYPE_MAIN;
2732
	c.event = XFRM_MSG_FLUSHPOLICY;
2733
	c.portid = hdr->sadb_msg_pid;
2734
	c.seq = hdr->sadb_msg_seq;
A
Alexey Dobriyan 已提交
2735
	c.net = net;
2736
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
2737 2738 2739 2740 2741

	return 0;
}

typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2742
			     const struct sadb_msg *hdr, void * const *ext_hdrs);
M
Mathias Krause 已提交
2743
static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
L
Linus Torvalds 已提交
2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
	[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,
2766
	[SADB_X_MIGRATE]	= pfkey_migrate,
L
Linus Torvalds 已提交
2767 2768
};

2769
static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
L
Linus Torvalds 已提交
2770 2771 2772 2773 2774
{
	void *ext_hdrs[SADB_EXT_MAX];
	int err;

	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
A
Alexey Dobriyan 已提交
2775
			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
L
Linus Torvalds 已提交
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 2812 2813

	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;
}

2814 2815
static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2816
{
2817 2818 2819 2820 2821 2822
	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
2823 2824
}

2825 2826
static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2827
{
2828 2829 2830 2831 2832 2833
	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
2834 2835
}

2836
static int count_ah_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2837 2838 2839 2840
{
	int i, sz = 0;

	for (i = 0; ; i++) {
2841
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2842 2843
		if (!aalg)
			break;
2844 2845
		if (!aalg->pfkey_supported)
			continue;
L
Linus Torvalds 已提交
2846 2847 2848 2849 2850 2851
		if (aalg_tmpl_set(t, aalg) && aalg->available)
			sz += sizeof(struct sadb_comb);
	}
	return sz + sizeof(struct sadb_prop);
}

2852
static int count_esp_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2853 2854 2855 2856
{
	int i, k, sz = 0;

	for (i = 0; ; i++) {
2857
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2858 2859
		if (!ealg)
			break;
2860

2861 2862 2863
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2864 2865
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2866

L
Linus Torvalds 已提交
2867
		for (k = 1; ; k++) {
2868
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2869 2870
			if (!aalg)
				break;
2871

2872 2873 2874
			if (!aalg->pfkey_supported)
				continue;

L
Linus Torvalds 已提交
2875 2876 2877 2878 2879 2880 2881
			if (aalg_tmpl_set(t, aalg) && aalg->available)
				sz += sizeof(struct sadb_comb);
		}
	}
	return sz + sizeof(struct sadb_prop);
}

2882
static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
{
	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++) {
2894
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2895 2896 2897
		if (!aalg)
			break;

2898 2899 2900
		if (!aalg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916
		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;
		}
	}
}

2917
static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
{
	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++) {
2929
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2930 2931
		if (!ealg)
			break;
2932

2933 2934 2935
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2936 2937
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2938

L
Linus Torvalds 已提交
2939 2940
		for (k = 1; ; k++) {
			struct sadb_comb *c;
2941
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2942 2943
			if (!aalg)
				break;
2944 2945
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964
			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;
		}
	}
}

2965
static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2966 2967 2968 2969
{
	return 0;
}

2970
static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
L
Linus Torvalds 已提交
2971 2972 2973
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2974 2975 2976
	int hard;
	int hsc;

2977
	hard = c->data.hard;
2978 2979 2980 2981
	if (hard)
		hsc = 2;
	else
		hsc = 1;
L
Linus Torvalds 已提交
2982

2983
	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
L
Linus Torvalds 已提交
2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995
	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
2996
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
2997 2998 2999
	return 0;
}

3000
static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3001
{
A
Alexey Dobriyan 已提交
3002
	struct net *net = x ? xs_net(x) : c->net;
A
Alexey Dobriyan 已提交
3003 3004 3005
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

	if (atomic_read(&net_pfkey->socks_nr) == 0)
3006 3007
		return 0;

3008
	switch (c->event) {
3009
	case XFRM_MSG_EXPIRE:
3010
		return key_notify_sa_expire(x, c);
3011 3012 3013
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
3014
		return key_notify_sa(x, c);
3015
	case XFRM_MSG_FLUSHSA:
3016
		return key_notify_sa_flush(c);
J
Jamal Hadi Salim 已提交
3017 3018
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
3019
	default:
3020
		pr_err("pfkey: Unknown SA event %d\n", c->event);
3021 3022 3023 3024 3025 3026
		break;
	}

	return 0;
}

3027
static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3028
{
3029 3030 3031
	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
		return 0;

3032
	switch (c->event) {
3033
	case XFRM_MSG_POLEXPIRE:
3034
		return key_notify_policy_expire(xp, c);
3035 3036 3037
	case XFRM_MSG_DELPOLICY:
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
3038
		return key_notify_policy(xp, dir, c);
3039
	case XFRM_MSG_FLUSHPOLICY:
3040 3041
		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
			break;
3042 3043
		return key_notify_policy_flush(c);
	default:
3044
		pr_err("pfkey: Unknown policy event %d\n", c->event);
3045 3046 3047 3048 3049 3050
		break;
	}

	return 0;
}

L
Linus Torvalds 已提交
3051 3052 3053
static u32 get_acqseq(void)
{
	u32 res;
3054
	static atomic_t acqseq;
L
Linus Torvalds 已提交
3055

3056 3057 3058
	do {
		res = atomic_inc_return(&acqseq);
	} while (!res);
L
Linus Torvalds 已提交
3059 3060 3061
	return res;
}

3062
static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
L
Linus Torvalds 已提交
3063 3064 3065 3066 3067 3068 3069
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_x_policy *pol;
	int sockaddr_size;
	int size;
3070 3071 3072
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
3073

L
Linus Torvalds 已提交
3074 3075 3076 3077 3078 3079 3080 3081
	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);
3082

L
Linus Torvalds 已提交
3083 3084 3085 3086 3087
	if (x->id.proto == IPPROTO_AH)
		size += count_ah_combs(t);
	else if (x->id.proto == IPPROTO_ESP)
		size += count_esp_combs(t);

3088 3089 3090 3091 3092
	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
3093 3094 3095
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3096

L
Linus Torvalds 已提交
3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107
	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 */
3108
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3109
					      sizeof(struct sadb_address)+sockaddr_size);
3110
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3111 3112 3113 3114 3115
		(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;
3116 3117 3118 3119 3120
	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
3121
		BUG();
3122

L
Linus Torvalds 已提交
3123
	/* dst address */
3124
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3125 3126 3127 3128 3129 3130 3131
					      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;
3132 3133 3134 3135 3136
	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
3137 3138 3139 3140 3141 3142
		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;
3143
	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3144
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
3145
	pol->sadb_x_policy_id = xp->index;
3146
	pol->sadb_x_policy_priority = xp->priority;
L
Linus Torvalds 已提交
3147 3148 3149 3150 3151 3152 3153

	/* 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);

3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167
	/* 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
3168
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3169 3170
}

3171
static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3172
						u8 *data, int len, int *dir)
L
Linus Torvalds 已提交
3173
{
A
Alexey Dobriyan 已提交
3174
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3175 3176
	struct xfrm_policy *xp;
	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3177
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
3178

3179
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
3180 3181 3182 3183 3184 3185
	case AF_INET:
		if (opt != IP_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
E
Eric Dumazet 已提交
3186
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206
	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
3207
	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
L
Linus Torvalds 已提交
3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219
	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;
3220
	xp->family = sk->sk_family;
L
Linus Torvalds 已提交
3221 3222 3223 3224 3225 3226

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

3227 3228 3229 3230 3231 3232 3233 3234 3235
	/* 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 +
3236 3237
		    sec_ctx->sadb_x_sec_len) {
			*dir = -EINVAL;
3238
			goto out;
3239
		}
3240 3241 3242
		if ((*dir = verify_sec_ctx_len(p)))
			goto out;
		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3243
		*dir = security_xfrm_policy_alloc(&xp->security, uctx);
3244 3245 3246 3247 3248 3249
		kfree(uctx);

		if (*dir)
			goto out;
	}

L
Linus Torvalds 已提交
3250 3251 3252 3253
	*dir = pol->sadb_x_policy_dir-1;
	return xp;

out:
3254
	xp->walk.dead = 1;
3255
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
3256 3257 3258
	return NULL;
}

A
Al Viro 已提交
3259
static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
L
Linus Torvalds 已提交
3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287
{
	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)
	 */
3288

L
Linus Torvalds 已提交
3289 3290 3291 3292 3293
	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);
3294

L
Linus Torvalds 已提交
3295 3296 3297
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3298

L
Linus Torvalds 已提交
3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
	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);
3323
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3324 3325 3326 3327 3328
		(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;
3329 3330 3331 3332 3333
	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
3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
		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);
3346
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3347 3348 3349 3350 3351
		(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;
3352 3353 3354 3355 3356
	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
3357 3358 3359 3360 3361 3362 3363 3364 3365
		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
3366
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3367 3368
}

3369 3370
#ifdef CONFIG_NET_KEY_MIGRATE
static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3371
			    const struct xfrm_selector *sel)
3372 3373 3374 3375 3376 3377 3378 3379 3380 3381
{
	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:
3382 3383 3384 3385
		addr->sadb_address_prefixlen = sel->prefixlen_s;
		pfkey_sockaddr_fill(&sel->saddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3386 3387
		break;
	case SADB_EXT_ADDRESS_DST:
3388 3389 3390 3391
		addr->sadb_address_prefixlen = sel->prefixlen_d;
		pfkey_sockaddr_fill(&sel->daddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3392 3393 3394 3395 3396 3397 3398 3399
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

3400

3401
static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425
{
	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;
}

3426 3427 3428
static int set_ipsecrequest(struct sk_buff *skb,
			    uint8_t proto, uint8_t mode, int level,
			    uint32_t reqid, uint8_t family,
3429
			    const xfrm_address_t *src, const xfrm_address_t *dst)
3430 3431
{
	struct sadb_x_ipsecrequest *rq;
3432 3433
	u8 *sa;
	int socklen = pfkey_sockaddr_len(family);
3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446
	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;

3447 3448 3449
	sa = (u8 *) (rq + 1);
	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3450 3451 3452 3453 3454 3455 3456
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_NET_KEY_MIGRATE
3457 3458 3459
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)
3460 3461 3462 3463 3464 3465 3466 3467
{
	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;
3468
	const struct xfrm_migrate *mp;
3469 3470 3471 3472 3473 3474 3475

	if (type != XFRM_POLICY_TYPE_MAIN)
		return 0;

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

3476 3477 3478 3479 3480 3481
	if (k != NULL) {
		/* addresses for KM */
		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
				     pfkey_sockaddr_pair_size(k->family));
	}

3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
	/* 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;

3518 3519
	/* Addresses to be used by KM for negotiation, if ext is available */
	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3520
		goto err;
3521

3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533
	/* 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;
3534
	pol->sadb_x_policy_reserved = 0;
3535 3536 3537 3538 3539
	pol->sadb_x_policy_id = 0;
	pol->sadb_x_policy_priority = 0;

	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old ipsecrequest */
3540 3541
		int mode = pfkey_mode_from_xfrm(mp->mode);
		if (mode < 0)
3542
			goto err;
3543
		if (set_ipsecrequest(skb, mp->proto, mode,
3544 3545
				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->old_family,
3546 3547
				     &mp->old_saddr, &mp->old_daddr) < 0)
			goto err;
3548 3549

		/* new ipsecrequest */
3550
		if (set_ipsecrequest(skb, mp->proto, mode,
3551 3552
				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->new_family,
3553 3554
				     &mp->new_saddr, &mp->new_daddr) < 0)
			goto err;
3555 3556 3557
	}

	/* broadcast migrate message to sockets */
A
Alexey Dobriyan 已提交
3558
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3559 3560

	return 0;
3561 3562 3563 3564

err:
	kfree_skb(skb);
	return -EINVAL;
3565 3566
}
#else
3567 3568 3569
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)
3570 3571 3572 3573 3574
{
	return -ENOPROTOOPT;
}
#endif

L
Linus Torvalds 已提交
3575 3576 3577 3578 3579 3580 3581
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
3582
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3583 3584 3585 3586 3587 3588

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

	err = -EMSGSIZE;
3589
	if ((unsigned int)len > sk->sk_sndbuf - 32)
L
Linus Torvalds 已提交
3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604
		goto out;

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

	err = -EFAULT;
	if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
		goto out;

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

F
Fan Du 已提交
3605
	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3606
	err = pfkey_process(sk, skb, hdr);
F
Fan Du 已提交
3607
	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3608 3609 3610 3611

out:
	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
		err = 0;
3612
	kfree_skb(skb);
L
Linus Torvalds 已提交
3613 3614 3615 3616 3617 3618 3619 3620 3621

	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;
3622
	struct pfkey_sock *pfk = pfkey_sk(sk);
L
Linus Torvalds 已提交
3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639
	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;
	}

3640
	skb_reset_transport_header(skb);
L
Linus Torvalds 已提交
3641 3642 3643 3644
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free;

3645
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
3646 3647 3648

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

3649 3650 3651 3652
	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
3653 3654 3655 3656 3657 3658
out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

3659
static const struct proto_ops pfkey_ops = {
L
Linus Torvalds 已提交
3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682
	.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,
};

3683
static const struct net_proto_family pfkey_family_ops = {
L
Linus Torvalds 已提交
3684 3685 3686 3687 3688 3689
	.family	=	PF_KEY,
	.create	=	pfkey_create,
	.owner	=	THIS_MODULE,
};

#ifdef CONFIG_PROC_FS
3690
static int pfkey_seq_show(struct seq_file *f, void *v)
L
Linus Torvalds 已提交
3691
{
3692
	struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
3693

3694 3695 3696
	if (v == SEQ_START_TOKEN)
		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
	else
D
Dan Rosenberg 已提交
3697
		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3698 3699
			       s,
			       atomic_read(&s->sk_refcnt),
3700 3701
			       sk_rmem_alloc_get(s),
			       sk_wmem_alloc_get(s),
3702
			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
L
Linus Torvalds 已提交
3703 3704
			       sock_i_ino(s)
			       );
3705 3706 3707 3708
	return 0;
}

static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3709
	__acquires(rcu)
3710
{
3711
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3712
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
L
Linus Torvalds 已提交
3713

S
stephen hemminger 已提交
3714 3715
	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3716 3717 3718 3719
}

static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
{
3720
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3721 3722
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

S
stephen hemminger 已提交
3723
	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3724
}
L
Linus Torvalds 已提交
3725

3726
static void pfkey_seq_stop(struct seq_file *f, void *v)
3727
	__releases(rcu)
3728
{
S
stephen hemminger 已提交
3729
	rcu_read_unlock();
3730
}
L
Linus Torvalds 已提交
3731

3732
static const struct seq_operations pfkey_seq_ops = {
3733 3734 3735 3736 3737
	.start	= pfkey_seq_start,
	.next	= pfkey_seq_next,
	.stop	= pfkey_seq_stop,
	.show	= pfkey_seq_show,
};
L
Linus Torvalds 已提交
3738

3739 3740
static int pfkey_seq_open(struct inode *inode, struct file *file)
{
3741 3742
	return seq_open_net(inode, file, &pfkey_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3743
}
3744

3745
static const struct file_operations pfkey_proc_ops = {
3746 3747 3748
	.open	 = pfkey_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
3749
	.release = seq_release_net,
3750 3751
};

3752
static int __net_init pfkey_init_proc(struct net *net)
3753
{
3754 3755
	struct proc_dir_entry *e;

3756
	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3757
	if (e == NULL)
3758
		return -ENOMEM;
3759 3760

	return 0;
3761 3762
}

3763
static void __net_exit pfkey_exit_proc(struct net *net)
3764
{
3765
	remove_proc_entry("pfkey", net->proc_net);
3766 3767
}
#else
3768
static inline int pfkey_init_proc(struct net *net)
3769 3770 3771 3772
{
	return 0;
}

3773
static inline void pfkey_exit_proc(struct net *net)
3774 3775
{
}
L
Linus Torvalds 已提交
3776 3777 3778 3779 3780 3781 3782 3783 3784
#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,
3785
	.notify_policy	= pfkey_send_policy_notify,
3786
	.migrate	= pfkey_send_migrate,
L
Linus Torvalds 已提交
3787 3788
};

A
Alexey Dobriyan 已提交
3789 3790
static int __net_init pfkey_net_init(struct net *net)
{
3791
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
A
Alexey Dobriyan 已提交
3792 3793 3794 3795
	int rv;

	INIT_HLIST_HEAD(&net_pfkey->table);
	atomic_set(&net_pfkey->socks_nr, 0);
3796

3797
	rv = pfkey_init_proc(net);
A
Alexey Dobriyan 已提交
3798 3799 3800 3801 3802 3803 3804 3805

	return rv;
}

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

3806
	pfkey_exit_proc(net);
A
Alexey Dobriyan 已提交
3807 3808 3809 3810 3811 3812
	BUG_ON(!hlist_empty(&net_pfkey->table));
}

static struct pernet_operations pfkey_net_ops = {
	.init = pfkey_net_init,
	.exit = pfkey_net_exit,
3813 3814
	.id   = &pfkey_net_id,
	.size = sizeof(struct netns_pfkey),
A
Alexey Dobriyan 已提交
3815 3816
};

L
Linus Torvalds 已提交
3817 3818 3819 3820
static void __exit ipsec_pfkey_exit(void)
{
	xfrm_unregister_km(&pfkeyv2_mgr);
	sock_unregister(PF_KEY);
3821
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3822 3823 3824 3825 3826 3827 3828 3829 3830 3831
	proto_unregister(&key_proto);
}

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

	if (err != 0)
		goto out;

3832
	err = register_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3833 3834
	if (err != 0)
		goto out_unregister_key_proto;
3835 3836 3837
	err = sock_register(&pfkey_family_ops);
	if (err != 0)
		goto out_unregister_pernet;
L
Linus Torvalds 已提交
3838 3839
	err = xfrm_register_km(&pfkeyv2_mgr);
	if (err != 0)
3840
		goto out_sock_unregister;
L
Linus Torvalds 已提交
3841 3842
out:
	return err;
3843

L
Linus Torvalds 已提交
3844 3845
out_sock_unregister:
	sock_unregister(PF_KEY);
3846 3847
out_unregister_pernet:
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3848 3849 3850 3851 3852 3853 3854 3855 3856
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);