af_key.c 100.7 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 1101 1102 1103 1104 1105
	if (x == NULL)
		return ERR_PTR(-ENOBUFS);

	x->id.proto = proto;
	x->id.spi = sa->sadb_sa_spi;
	x->props.replay_window = sa->sadb_sa_replay;
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
		x->props.flags |= XFRM_STATE_NOECN;
	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
		x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106 1107
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
L
Linus Torvalds 已提交
1108

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

J
Joe Perches 已提交
1124
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	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
1138
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1139 1140 1141
	if (sa->sadb_sa_auth) {
		int keysize = 0;
		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142
		if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
			err = -ENOSYS;
			goto out;
		}
		if (key)
			keysize = (key->sadb_key_bits + 7) / 8;
		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
		if (!x->aalg)
			goto out;
		strcpy(x->aalg->alg_name, a->name);
		x->aalg->alg_key_len = 0;
		if (key) {
			x->aalg->alg_key_len = key->sadb_key_bits;
			memcpy(x->aalg->alg_key, key+1, keysize);
		}
1157
		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
L
Linus Torvalds 已提交
1158 1159 1160 1161 1162 1163
		x->props.aalgo = sa->sadb_sa_auth;
		/* x->algo.flags = sa->sadb_sa_flags; */
	}
	if (sa->sadb_sa_encrypt) {
		if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
			struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
				err = -ENOSYS;
				goto out;
			}
			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
			if (!x->calg)
				goto out;
			strcpy(x->calg->alg_name, a->name);
			x->props.calgo = sa->sadb_sa_encrypt;
		} else {
			int keysize = 0;
			struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
				err = -ENOSYS;
				goto out;
			}
			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
			if (key)
				keysize = (key->sadb_key_bits + 7) / 8;
			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
			if (!x->ealg)
				goto out;
			strcpy(x->ealg->alg_name, a->name);
			x->ealg->alg_key_len = 0;
			if (key) {
				x->ealg->alg_key_len = key->sadb_key_bits;
				memcpy(x->ealg->alg_key, key+1, keysize);
			}
			x->props.ealgo = sa->sadb_sa_encrypt;
		}
	}
	/* x->algo.flags = sa->sadb_sa_flags; */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	if (x == NULL)
		return -ENOENT;

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

1336 1337 1338 1339
	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
	if (range) {
		min_spi = range->sadb_spirange_min;
		max_spi = range->sadb_spirange_max;
L
Linus Torvalds 已提交
1340
	}
1341 1342

	err = xfrm_alloc_spi(x, min_spi, max_spi);
1343
	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360

	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
1361
	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
L
Linus Torvalds 已提交
1362 1363 1364 1365

	return 0;
}

1366
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
1367
{
A
Alexey Dobriyan 已提交
1368
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1369 1370 1371 1372 1373 1374 1375 1376
	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;

1377
	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
L
Linus Torvalds 已提交
1378 1379 1380 1381 1382 1383
	if (x == NULL)
		return 0;

	spin_lock_bh(&x->lock);
	if (x->km.state == XFRM_STATE_ACQ) {
		x->km.state = XFRM_STATE_ERROR;
A
Alexey Dobriyan 已提交
1384
		wake_up(&net->xfrm.km_waitq);
L
Linus Torvalds 已提交
1385 1386 1387 1388 1389 1390
	}
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return 0;
}

1391 1392 1393
static inline int event2poltype(int event)
{
	switch (event) {
1394
	case XFRM_MSG_DELPOLICY:
1395
		return SADB_X_SPDDELETE;
1396
	case XFRM_MSG_NEWPOLICY:
1397
		return SADB_X_SPDADD;
1398
	case XFRM_MSG_UPDPOLICY:
1399
		return SADB_X_SPDUPDATE;
1400
	case XFRM_MSG_POLEXPIRE:
1401 1402
	//	return SADB_X_SPDEXPIRE;
	default:
1403
		pr_err("pfkey: Unknown policy event %d\n", event);
1404 1405 1406 1407 1408 1409 1410 1411 1412
		break;
	}

	return 0;
}

static inline int event2keytype(int event)
{
	switch (event) {
1413
	case XFRM_MSG_DELSA:
1414
		return SADB_DELETE;
1415
	case XFRM_MSG_NEWSA:
1416
		return SADB_ADD;
1417
	case XFRM_MSG_UPDSA:
1418
		return SADB_UPDATE;
1419
	case XFRM_MSG_EXPIRE:
1420 1421
		return SADB_EXPIRE;
	default:
1422
		pr_err("pfkey: Unknown SA event %d\n", event);
1423 1424 1425 1426 1427 1428 1429
		break;
	}

	return 0;
}

/* ADD/UPD/DEL */
1430
static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1431 1432 1433 1434
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

1435
	skb = pfkey_xfrm_state2msg(x);
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446

	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;
1447
	hdr->sadb_msg_pid = c->portid;
1448

A
Alexey Dobriyan 已提交
1449
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1450 1451 1452

	return 0;
}
L
Linus Torvalds 已提交
1453

1454
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
1455
{
A
Alexey Dobriyan 已提交
1456
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1457 1458
	struct xfrm_state *x;
	int err;
1459
	struct km_event c;
L
Linus Torvalds 已提交
1460

A
Alexey Dobriyan 已提交
1461
	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1462 1463 1464
	if (IS_ERR(x))
		return PTR_ERR(x);

1465
	xfrm_state_hold(x);
L
Linus Torvalds 已提交
1466 1467 1468 1469 1470
	if (hdr->sadb_msg_type == SADB_ADD)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

J
Joy Latten 已提交
1471
	xfrm_audit_state_add(x, err ? 0 : 1,
1472 1473
			     audit_get_loginuid(current),
			     audit_get_sessionid(current), 0);
J
Joy Latten 已提交
1474

L
Linus Torvalds 已提交
1475 1476
	if (err < 0) {
		x->km.state = XFRM_STATE_DEAD;
1477
		__xfrm_state_put(x);
1478
		goto out;
L
Linus Torvalds 已提交
1479 1480
	}

1481
	if (hdr->sadb_msg_type == SADB_ADD)
1482
		c.event = XFRM_MSG_NEWSA;
1483
	else
1484
		c.event = XFRM_MSG_UPDSA;
1485
	c.seq = hdr->sadb_msg_seq;
1486
	c.portid = hdr->sadb_msg_pid;
1487
	km_state_notify(x, &c);
1488
out:
1489 1490
	xfrm_state_put(x);
	return err;
L
Linus Torvalds 已提交
1491 1492
}

1493
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
1494
{
A
Alexey Dobriyan 已提交
1495
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1496
	struct xfrm_state *x;
1497 1498
	struct km_event c;
	int err;
L
Linus Torvalds 已提交
1499 1500 1501 1502 1503 1504

	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
1505
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1506 1507 1508
	if (x == NULL)
		return -ESRCH;

C
Catherine Zhang 已提交
1509 1510 1511
	if ((err = security_xfrm_state_delete(x)))
		goto out;

L
Linus Torvalds 已提交
1512
	if (xfrm_state_kern(x)) {
C
Catherine Zhang 已提交
1513 1514
		err = -EPERM;
		goto out;
L
Linus Torvalds 已提交
1515
	}
J
Joy Latten 已提交
1516

1517
	err = xfrm_state_delete(x);
J
Joy Latten 已提交
1518

C
Catherine Zhang 已提交
1519 1520
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
1521

1522
	c.seq = hdr->sadb_msg_seq;
1523
	c.portid = hdr->sadb_msg_pid;
1524
	c.event = XFRM_MSG_DELSA;
1525
	km_state_notify(x, &c);
C
Catherine Zhang 已提交
1526
out:
J
Joy Latten 已提交
1527
	xfrm_audit_state_delete(x, err ? 0 : 1,
1528 1529
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
1530
	xfrm_state_put(x);
L
Linus Torvalds 已提交
1531

1532
	return err;
L
Linus Torvalds 已提交
1533 1534
}

1535
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
1536
{
A
Alexey Dobriyan 已提交
1537
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
	__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
1548
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1549 1550 1551
	if (x == NULL)
		return -ESRCH;

1552
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1553 1554 1555 1556 1557 1558 1559
	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;
1560
	out_hdr->sadb_msg_type = SADB_GET;
L
Linus Torvalds 已提交
1561 1562 1563 1564 1565
	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
1566
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
L
Linus Torvalds 已提交
1567 1568 1569 1570

	return 0;
}

1571
static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
A
Al Viro 已提交
1572
					      gfp_t allocation)
L
Linus Torvalds 已提交
1573 1574 1575 1576 1577
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	int len, auth_len, enc_len, i;

1578
	auth_len = xfrm_count_pfkey_auth_supported();
L
Linus Torvalds 已提交
1579 1580 1581 1582
	if (auth_len) {
		auth_len *= sizeof(struct sadb_alg);
		auth_len += sizeof(struct sadb_supported);
	}
1583

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

L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
	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;
1615 1616
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
			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;
1636 1637
			if (!ealg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1638 1639 1640 1641 1642 1643 1644 1645 1646
			if (ealg->available)
				*ap++ = ealg->desc;
		}
	}

out_put_algs:
	return skb;
}

1647
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
1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
{
	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();
1662

L
Linus Torvalds 已提交
1663 1664 1665 1666 1667 1668 1669 1670
	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
1671
	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
L
Linus Torvalds 已提交
1672 1673 1674 1675

	return 0;
}

1676
static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
{
	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));
}

1693
static int key_notify_sa_flush(const struct km_event *c)
1694 1695 1696 1697 1698 1699 1700 1701
{
	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));
1702
	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
J
Jerome Borsboom 已提交
1703
	hdr->sadb_msg_type = SADB_FLUSH;
1704
	hdr->sadb_msg_seq = c->seq;
1705
	hdr->sadb_msg_pid = c->portid;
1706 1707 1708
	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));
1709
	hdr->sadb_msg_reserved = 0;
1710

A
Alexey Dobriyan 已提交
1711
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1712 1713 1714 1715

	return 0;
}

1716
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
1717
{
A
Alexey Dobriyan 已提交
1718
	struct net *net = sock_net(sk);
1719
	unsigned int proto;
1720
	struct km_event c;
J
Joy Latten 已提交
1721
	struct xfrm_audit audit_info;
1722
	int err, err2;
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727

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

1728
	audit_info.loginuid = audit_get_loginuid(current);
1729
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
1730
	audit_info.secid = 0;
A
Alexey Dobriyan 已提交
1731
	err = xfrm_state_flush(net, proto, &audit_info);
1732
	err2 = unicast_flush_resp(sk, hdr);
1733 1734 1735
	if (err || err2) {
		if (err == -ESRCH) /* empty table - go quietly */
			err = 0;
1736
		return err ? err : err2;
1737
	}
1738

1739
	c.data.proto = proto;
1740
	c.seq = hdr->sadb_msg_seq;
1741
	c.portid = hdr->sadb_msg_pid;
1742
	c.event = XFRM_MSG_FLUSHSA;
A
Alexey Dobriyan 已提交
1743
	c.net = net;
1744
	km_state_notify(NULL, &c);
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750

	return 0;
}

static int dump_sa(struct xfrm_state *x, int count, void *ptr)
{
1751
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
1752 1753 1754
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;

1755 1756 1757
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

1758
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1759 1760 1761 1762
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
1763
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
1764 1765 1766 1767
	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
1768
	out_hdr->sadb_msg_seq = count + 1;
1769
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
1770 1771 1772

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
1773
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
1774 1775
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
1776 1777 1778
	return 0;
}

1779 1780
static int pfkey_dump_sa(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
1781 1782
	struct net *net = sock_net(&pfk->sk);
	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 1784 1785 1786 1787 1788 1789
}

static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
{
	xfrm_state_walk_done(&pfk->dump.u.state);
}

1790
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
1791 1792
{
	u8 proto;
1793 1794 1795 1796
	struct pfkey_sock *pfk = pfkey_sk(sk);

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

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

1802
	pfk->dump.msg_version = hdr->sadb_msg_version;
1803
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1804 1805 1806
	pfk->dump.dump = pfkey_dump_sa;
	pfk->dump.done = pfkey_dump_sa_done;
	xfrm_state_walk_init(&pfk->dump.u.state, proto);
1807

1808
	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
1809 1810
}

1811
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
1812 1813 1814
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;
1815
	bool reset_errno = false;
L
Linus Torvalds 已提交
1816 1817

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1818
		reset_errno = true;
L
Linus Torvalds 已提交
1819 1820 1821 1822
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
	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
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
	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
1849
static u32 gen_reqid(struct net *net)
L
Linus Torvalds 已提交
1850
{
1851
	struct xfrm_policy_walk walk;
L
Linus Torvalds 已提交
1852
	u32 start;
1853
	int rc;
L
Linus Torvalds 已提交
1854 1855 1856 1857 1858 1859 1860
	static u32 reqid = IPSEC_MANUAL_REQID_MAX;

	start = reqid;
	do {
		++reqid;
		if (reqid == 0)
			reqid = IPSEC_MANUAL_REQID_MAX+1;
1861
		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
A
Alexey Dobriyan 已提交
1862
		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1863 1864
		xfrm_policy_walk_done(&walk);
		if (rc != -EEXIST)
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869 1870 1871 1872
			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
1873
	struct net *net = xp_net(xp);
L
Linus Torvalds 已提交
1874
	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1875
	int mode;
L
Linus Torvalds 已提交
1876 1877 1878 1879 1880 1881 1882 1883

	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 */
1884 1885 1886
	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	t->mode = mode;
L
Linus Torvalds 已提交
1887 1888 1889 1890 1891 1892
	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
1893
		if (!t->reqid && !(t->reqid = gen_reqid(net)))
L
Linus Torvalds 已提交
1894 1895 1896 1897
			return -ENOBUFS;
	}

	/* addresses present only in tunnel mode */
1898
	if (t->mode == XFRM_MODE_TUNNEL) {
1899 1900 1901 1902 1903 1904
		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
1905
			return -EINVAL;
1906 1907 1908 1909 1910 1911

		socklen = pfkey_sockaddr_len(family);
		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
					   &t->id.daddr) != family)
			return -EINVAL;
		t->encap_family = family;
1912 1913 1914
	} else
		t->encap_family = xp->family;

L
Linus Torvalds 已提交
1915
	/* No way to set this via kame pfkey */
1916
	t->allalgs = 1;
L
Linus Torvalds 已提交
1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
	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);

1928 1929 1930
	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
		return -EINVAL;

L
Linus Torvalds 已提交
1931 1932 1933 1934 1935 1936 1937 1938 1939
	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;
}

1940
static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
{
  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;
}

1952
static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1953
{
1954
	const struct xfrm_tmpl *t;
L
Linus Torvalds 已提交
1955
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1956 1957 1958 1959 1960
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
1961
		socklen += pfkey_sockaddr_len(t->encap_family);
1962
	}
L
Linus Torvalds 已提交
1963 1964 1965

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
1966
		(sizeof(struct sadb_address) * 2) +
L
Linus Torvalds 已提交
1967 1968
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
1969 1970
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
1971
		pfkey_xfrm_policy2sec_ctx_size(xp);
L
Linus Torvalds 已提交
1972 1973
}

1974
static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
{
	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;
}

1988
static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
L
Linus Torvalds 已提交
1989 1990 1991 1992 1993
{
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_lifetime *lifetime;
	struct sadb_x_policy *pol;
1994 1995
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
L
Linus Torvalds 已提交
1996 1997 1998
	int i;
	int size;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1999
	int socklen = pfkey_sockaddr_len(xp->family);
L
Linus Torvalds 已提交
2000 2001 2002 2003 2004 2005 2006 2007

	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 */
2008
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2009
					      sizeof(struct sadb_address)+sockaddr_size);
2010
	addr->sadb_address_len =
L
Linus Torvalds 已提交
2011 2012 2013 2014 2015 2016
		(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;
2017 2018 2019 2020
	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
				 xp->selector.sport,
				 (struct sockaddr *) (addr + 1),
				 xp->family))
L
Linus Torvalds 已提交
2021 2022 2023
		BUG();

	/* dst address */
2024
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2025 2026 2027 2028 2029 2030
					      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);
2031
	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
L
Linus Torvalds 已提交
2032
	addr->sadb_address_reserved = 0;
2033 2034 2035 2036

	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
			    (struct sockaddr *) (addr + 1),
			    xp->family);
L
Linus Torvalds 已提交
2037 2038

	/* hard time */
2039
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2040 2041 2042 2043 2044 2045 2046 2047 2048
						     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 */
2049
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2050 2051 2052 2053 2054 2055 2056 2057 2058
						     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 */
2059
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
						     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;
2080
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
2081 2082 2083 2084
	pol->sadb_x_policy_id = xp->index;
	pol->sadb_x_policy_priority = xp->priority;

	for (i=0; i<xp->xfrm_nr; i++) {
2085
		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
L
Linus Torvalds 已提交
2086 2087
		struct sadb_x_ipsecrequest *rq;
		int req_size;
2088
		int mode;
L
Linus Torvalds 已提交
2089 2090

		req_size = sizeof(struct sadb_x_ipsecrequest);
2091 2092 2093 2094
		if (t->mode == XFRM_MODE_TUNNEL) {
			socklen = pfkey_sockaddr_len(t->encap_family);
			req_size += socklen * 2;
		} else {
L
Linus Torvalds 已提交
2095
			size -= 2*socklen;
2096
		}
L
Linus Torvalds 已提交
2097 2098 2099 2100 2101
		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;
2102 2103
		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
			return -EINVAL;
2104
		rq->sadb_x_ipsecrequest_mode = mode;
L
Linus Torvalds 已提交
2105 2106 2107 2108 2109 2110
		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;
2111

2112
		if (t->mode == XFRM_MODE_TUNNEL) {
2113 2114 2115 2116 2117 2118 2119
			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
2120 2121
		}
	}
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136

	/* 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
2137 2138
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2139 2140

	return 0;
L
Linus Torvalds 已提交
2141 2142
}

2143
static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2144 2145 2146 2147 2148 2149
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	int err;

	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2150 2151 2152
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2153 2154 2155
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
2156 2157 2158 2159

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

2160
	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2161 2162 2163 2164 2165
		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;
2166
	out_hdr->sadb_msg_pid = c->portid;
A
Alexey Dobriyan 已提交
2167
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2168 2169 2170 2171
	return 0;

}

2172
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
2173
{
A
Alexey Dobriyan 已提交
2174
	struct net *net = sock_net(sk);
2175
	int err = 0;
L
Linus Torvalds 已提交
2176 2177 2178 2179
	struct sadb_lifetime *lifetime;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2180
	struct km_event c;
2181
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193

	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
2194
	xp = xfrm_policy_alloc(net, GFP_KERNEL);
L
Linus Torvalds 已提交
2195 2196 2197 2198 2199 2200 2201
	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
2202
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2203 2204 2205 2206 2207 2208
	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)
2209
		xp->selector.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2210

J
Junwei Zhang 已提交
2211
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2212 2213 2214 2215 2216 2217 2218 2219 2220 2221
	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)
2222
		xp->selector.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2223

J
Joe Perches 已提交
2224
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2225 2226 2227 2228 2229 2230 2231 2232
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

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

2233
		err = security_xfrm_policy_alloc(&xp->security, uctx);
2234 2235 2236 2237 2238 2239
		kfree(uctx);

		if (err)
			goto out;
	}

L
Linus Torvalds 已提交
2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
	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);
2263

J
Joy Latten 已提交
2264
	xfrm_audit_policy_add(xp, err ? 0 : 1,
2265 2266
			      audit_get_loginuid(current),
			      audit_get_sessionid(current), 0);
J
Joy Latten 已提交
2267

2268 2269
	if (err)
		goto out;
L
Linus Torvalds 已提交
2270

2271
	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2272
		c.event = XFRM_MSG_UPDPOLICY;
2273
	else
2274
		c.event = XFRM_MSG_NEWPOLICY;
L
Linus Torvalds 已提交
2275

2276
	c.seq = hdr->sadb_msg_seq;
2277
	c.portid = hdr->sadb_msg_pid;
L
Linus Torvalds 已提交
2278

2279 2280
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
2281 2282 2283
	return 0;

out:
H
Herbert Xu 已提交
2284
	xp->walk.dead = 1;
2285
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
2286 2287 2288
	return err;
}

2289
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
2290
{
A
Alexey Dobriyan 已提交
2291
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2292 2293 2294
	int err;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
2295
	struct xfrm_policy *xp;
L
Linus Torvalds 已提交
2296
	struct xfrm_selector sel;
2297
	struct km_event c;
2298
	struct sadb_x_sec_ctx *sec_ctx;
2299
	struct xfrm_sec_ctx *pol_ctx = NULL;
L
Linus Torvalds 已提交
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311

	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
2312
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2313 2314 2315 2316 2317
	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)
2318
		sel.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2319

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

J
Joe Perches 已提交
2328
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2329 2330 2331 2332 2333 2334
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

		if (!uctx)
			return -ENOMEM;

2335
		err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2336 2337 2338
		kfree(uctx);
		if (err)
			return err;
2339
	}
J
Joy Latten 已提交
2340

2341
	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2342 2343 2344
				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
				   1, &err);
	security_xfrm_policy_free(pol_ctx);
L
Linus Torvalds 已提交
2345 2346 2347
	if (xp == NULL)
		return -ENOENT;

J
Joy Latten 已提交
2348
	xfrm_audit_policy_delete(xp, err ? 0 : 1,
2349 2350
				 audit_get_loginuid(current),
				 audit_get_sessionid(current), 0);
2351 2352

	if (err)
C
Catherine Zhang 已提交
2353
		goto out;
2354

2355
	c.seq = hdr->sadb_msg_seq;
2356
	c.portid = hdr->sadb_msg_pid;
2357
	c.data.byid = 0;
2358
	c.event = XFRM_MSG_DELPOLICY;
2359 2360
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);

C
Catherine Zhang 已提交
2361
out:
2362
	xfrm_pol_put(xp);
2363 2364
	if (err == 0)
		xfrm_garbage_collect(net);
2365 2366 2367
	return err;
}

2368
static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2369 2370 2371 2372 2373 2374
{
	int err;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	err = 0;

L
Linus Torvalds 已提交
2375 2376 2377 2378 2379
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err =  PTR_ERR(out_skb);
		goto out;
	}
2380 2381 2382
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
2383 2384 2385

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2386
	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
L
Linus Torvalds 已提交
2387 2388 2389 2390
	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
2391
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
L
Linus Torvalds 已提交
2392 2393 2394 2395 2396 2397
	err = 0;

out:
	return err;
}

2398 2399 2400
#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_sockaddr_pair_size(sa_family_t family)
{
2401
	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2402 2403
}

2404
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2405 2406 2407
			       xfrm_address_t *saddr, xfrm_address_t *daddr,
			       u16 *family)
{
2408 2409
	int af, socklen;

2410
	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2411 2412
		return -EINVAL;

2413
	af = pfkey_sockaddr_extract(sa, saddr);
2414 2415 2416 2417
	if (!af)
		return -EINVAL;

	socklen = pfkey_sockaddr_len(af);
2418
	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2419
				   daddr) != af)
2420 2421
		return -EINVAL;

2422
	*family = af;
2423 2424 2425 2426 2427 2428 2429 2430
	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;
2431
	int mode;
2432 2433 2434 2435 2436 2437

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

	/* old endoints */
2438 2439 2440
	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
				  rq1->sadb_x_ipsecrequest_len,
				  &m->old_saddr, &m->old_daddr,
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
				  &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 */
2453 2454 2455
	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
				  rq2->sadb_x_ipsecrequest_len,
				  &m->new_saddr, &m->new_daddr,
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
				  &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;
2466 2467 2468
	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	m->mode = mode;
2469 2470 2471 2472 2473 2474 2475
	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,
2476
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2477 2478 2479 2480
{
	int i, len, ret, err = -EINVAL;
	u8 dir;
	struct sadb_address *sa;
2481
	struct sadb_x_kmaddress *kma;
2482 2483 2484 2485
	struct sadb_x_policy *pol;
	struct sadb_x_ipsecrequest *rq;
	struct xfrm_selector sel;
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2486
	struct xfrm_kmaddress k;
2487 2488

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2489
				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2490 2491 2492 2493 2494
	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
		err = -EINVAL;
		goto out;
	}

2495
	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2496 2497 2498 2499 2500 2501 2502
	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];

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

2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514
	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;
		}
	}

2515 2516 2517 2518 2519 2520 2521 2522 2523 2524
	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
2525
		sel.sport_mask = htons(0xffff);
2526 2527 2528 2529 2530 2531 2532 2533

	/* 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
2534
		sel.dport_mask = htons(0xffff);
2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558

	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;
	}

2559 2560
	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
			    kma ? &k : NULL);
2561 2562 2563 2564 2565 2566

 out:
	return err;
}
#else
static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
S
Stephen Hemminger 已提交
2567
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2568 2569 2570 2571 2572 2573
{
	return -ENOPROTOOPT;
}
#endif


2574
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
2575
{
A
Alexey Dobriyan 已提交
2576
	struct net *net = sock_net(sk);
2577
	unsigned int dir;
2578
	int err = 0, delete;
L
Linus Torvalds 已提交
2579 2580
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2581
	struct km_event c;
L
Linus Torvalds 已提交
2582 2583 2584 2585

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

2586 2587 2588 2589
	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

2590
	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2591
	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2592
			      dir, pol->sadb_x_policy_id, delete, &err);
L
Linus Torvalds 已提交
2593 2594 2595
	if (xp == NULL)
		return -ENOENT;

2596
	if (delete) {
J
Joy Latten 已提交
2597
		xfrm_audit_policy_delete(xp, err ? 0 : 1,
2598 2599
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
L
Linus Torvalds 已提交
2600

2601 2602 2603
		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
2604
		c.portid = hdr->sadb_msg_pid;
2605
		c.data.byid = 1;
2606
		c.event = XFRM_MSG_DELPOLICY;
2607
		km_policy_notify(xp, dir, &c);
2608
	} else {
2609
		err = key_pol_get_resp(sk, xp, hdr, dir);
L
Linus Torvalds 已提交
2610 2611
	}

2612
out:
L
Linus Torvalds 已提交
2613
	xfrm_pol_put(xp);
2614 2615
	if (delete && err == 0)
		xfrm_garbage_collect(net);
L
Linus Torvalds 已提交
2616 2617 2618 2619 2620
	return err;
}

static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
2621
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
2622 2623
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2624
	int err;
L
Linus Torvalds 已提交
2625

2626 2627 2628
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

L
Linus Torvalds 已提交
2629 2630 2631 2632
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2633 2634 2635
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2636 2637

	out_hdr = (struct sadb_msg *) out_skb->data;
2638
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
2639 2640 2641
	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
2642
	out_hdr->sadb_msg_seq = count + 1;
2643
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
2644 2645 2646

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
2647
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
2648 2649
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
2650 2651 2652
	return 0;
}

2653 2654
static int pfkey_dump_sp(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
2655 2656
	struct net *net = sock_net(&pfk->sk);
	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2657 2658 2659 2660 2661 2662 2663
}

static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
{
	xfrm_policy_walk_done(&pfk->dump.u.policy);
}

2664
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
2665
{
2666
	struct pfkey_sock *pfk = pfkey_sk(sk);
2667

2668 2669
	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
2670

2671
	pfk->dump.msg_version = hdr->sadb_msg_version;
2672
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2673 2674 2675 2676 2677
	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
2678 2679
}

2680
static int key_notify_policy_flush(const struct km_event *c)
L
Linus Torvalds 已提交
2681 2682
{
	struct sk_buff *skb_out;
2683
	struct sadb_msg *hdr;
L
Linus Torvalds 已提交
2684

2685
	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
L
Linus Torvalds 已提交
2686 2687
	if (!skb_out)
		return -ENOBUFS;
2688
	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
J
Jerome Borsboom 已提交
2689
	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2690
	hdr->sadb_msg_seq = c->seq;
2691
	hdr->sadb_msg_pid = c->portid;
2692 2693
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_errno = (uint8_t) 0;
2694
	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2695
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2696
	hdr->sadb_msg_reserved = 0;
A
Alexey Dobriyan 已提交
2697
	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2698
	return 0;
L
Linus Torvalds 已提交
2699

2700 2701
}

2702
static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2703
{
A
Alexey Dobriyan 已提交
2704
	struct net *net = sock_net(sk);
2705
	struct km_event c;
J
Joy Latten 已提交
2706
	struct xfrm_audit audit_info;
2707
	int err, err2;
L
Linus Torvalds 已提交
2708

2709
	audit_info.loginuid = audit_get_loginuid(current);
2710
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
2711
	audit_info.secid = 0;
A
Alexey Dobriyan 已提交
2712
	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2713
	err2 = unicast_flush_resp(sk, hdr);
2714 2715 2716 2717 2718
	if (err || err2) {
		if (err == -ESRCH) /* empty table - old silent behavior */
			return 0;
		return err;
	}
2719

2720
	c.data.type = XFRM_POLICY_TYPE_MAIN;
2721
	c.event = XFRM_MSG_FLUSHPOLICY;
2722
	c.portid = hdr->sadb_msg_pid;
2723
	c.seq = hdr->sadb_msg_seq;
A
Alexey Dobriyan 已提交
2724
	c.net = net;
2725
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
2726 2727 2728 2729 2730

	return 0;
}

typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2731
			     const struct sadb_msg *hdr, void * const *ext_hdrs);
M
Mathias Krause 已提交
2732
static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
L
Linus Torvalds 已提交
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
	[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,
2755
	[SADB_X_MIGRATE]	= pfkey_migrate,
L
Linus Torvalds 已提交
2756 2757
};

2758
static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
L
Linus Torvalds 已提交
2759 2760 2761 2762 2763
{
	void *ext_hdrs[SADB_EXT_MAX];
	int err;

	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
A
Alexey Dobriyan 已提交
2764
			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
L
Linus Torvalds 已提交
2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802

	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;
}

2803 2804
static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2805
{
2806 2807 2808 2809 2810 2811
	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
2812 2813
}

2814 2815
static inline int ealg_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->ealgos) * 8)
		return 0;

	return (t->ealgos >> id) & 1;
L
Linus Torvalds 已提交
2823 2824
}

2825
static int count_ah_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2826 2827 2828 2829
{
	int i, sz = 0;

	for (i = 0; ; i++) {
2830
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2831 2832
		if (!aalg)
			break;
2833 2834
		if (!aalg->pfkey_supported)
			continue;
L
Linus Torvalds 已提交
2835 2836 2837 2838 2839 2840
		if (aalg_tmpl_set(t, aalg) && aalg->available)
			sz += sizeof(struct sadb_comb);
	}
	return sz + sizeof(struct sadb_prop);
}

2841
static int count_esp_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2842 2843 2844 2845
{
	int i, k, sz = 0;

	for (i = 0; ; i++) {
2846
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2847 2848
		if (!ealg)
			break;
2849

2850 2851 2852
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2853 2854
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2855

L
Linus Torvalds 已提交
2856
		for (k = 1; ; k++) {
2857
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2858 2859
			if (!aalg)
				break;
2860

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

L
Linus Torvalds 已提交
2864 2865 2866 2867 2868 2869 2870
			if (aalg_tmpl_set(t, aalg) && aalg->available)
				sz += sizeof(struct sadb_comb);
		}
	}
	return sz + sizeof(struct sadb_prop);
}

2871
static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882
{
	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++) {
2883
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2884 2885 2886
		if (!aalg)
			break;

2887 2888 2889
		if (!aalg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905
		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;
		}
	}
}

2906
static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917
{
	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++) {
2918
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2919 2920
		if (!ealg)
			break;
2921

2922 2923 2924
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2925 2926
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2927

L
Linus Torvalds 已提交
2928 2929
		for (k = 1; ; k++) {
			struct sadb_comb *c;
2930
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2931 2932
			if (!aalg)
				break;
2933 2934
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
			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;
		}
	}
}

2954
static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2955 2956 2957 2958
{
	return 0;
}

2959
static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
L
Linus Torvalds 已提交
2960 2961 2962
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2963 2964 2965
	int hard;
	int hsc;

2966
	hard = c->data.hard;
2967 2968 2969 2970
	if (hard)
		hsc = 2;
	else
		hsc = 1;
L
Linus Torvalds 已提交
2971

2972
	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
L
Linus Torvalds 已提交
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
	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
2985
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
2986 2987 2988
	return 0;
}

2989
static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2990
{
A
Alexey Dobriyan 已提交
2991
	struct net *net = x ? xs_net(x) : c->net;
A
Alexey Dobriyan 已提交
2992 2993 2994
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

	if (atomic_read(&net_pfkey->socks_nr) == 0)
2995 2996
		return 0;

2997
	switch (c->event) {
2998
	case XFRM_MSG_EXPIRE:
2999
		return key_notify_sa_expire(x, c);
3000 3001 3002
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
3003
		return key_notify_sa(x, c);
3004
	case XFRM_MSG_FLUSHSA:
3005
		return key_notify_sa_flush(c);
J
Jamal Hadi Salim 已提交
3006 3007
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
3008
	default:
3009
		pr_err("pfkey: Unknown SA event %d\n", c->event);
3010 3011 3012 3013 3014 3015
		break;
	}

	return 0;
}

3016
static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3017
{
3018 3019 3020
	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
		return 0;

3021
	switch (c->event) {
3022
	case XFRM_MSG_POLEXPIRE:
3023
		return key_notify_policy_expire(xp, c);
3024 3025 3026
	case XFRM_MSG_DELPOLICY:
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
3027
		return key_notify_policy(xp, dir, c);
3028
	case XFRM_MSG_FLUSHPOLICY:
3029 3030
		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
			break;
3031 3032
		return key_notify_policy_flush(c);
	default:
3033
		pr_err("pfkey: Unknown policy event %d\n", c->event);
3034 3035 3036 3037 3038 3039
		break;
	}

	return 0;
}

L
Linus Torvalds 已提交
3040 3041 3042
static u32 get_acqseq(void)
{
	u32 res;
3043
	static atomic_t acqseq;
L
Linus Torvalds 已提交
3044

3045 3046 3047
	do {
		res = atomic_inc_return(&acqseq);
	} while (!res);
L
Linus Torvalds 已提交
3048 3049 3050
	return res;
}

3051
static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
L
Linus Torvalds 已提交
3052 3053 3054 3055 3056 3057 3058
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_x_policy *pol;
	int sockaddr_size;
	int size;
3059 3060 3061
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
3062

L
Linus Torvalds 已提交
3063 3064 3065 3066 3067 3068 3069 3070
	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);
3071

L
Linus Torvalds 已提交
3072 3073 3074 3075 3076
	if (x->id.proto == IPPROTO_AH)
		size += count_ah_combs(t);
	else if (x->id.proto == IPPROTO_ESP)
		size += count_esp_combs(t);

3077 3078 3079 3080 3081
	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
3082 3083 3084
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3085

L
Linus Torvalds 已提交
3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096
	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 */
3097
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3098
					      sizeof(struct sadb_address)+sockaddr_size);
3099
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3100 3101 3102 3103 3104
		(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;
3105 3106 3107 3108 3109
	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
3110
		BUG();
3111

L
Linus Torvalds 已提交
3112
	/* dst address */
3113
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3114 3115 3116 3117 3118 3119 3120
					      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;
3121 3122 3123 3124 3125
	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
3126 3127 3128 3129 3130 3131
		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;
3132
	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3133
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
3134
	pol->sadb_x_policy_id = xp->index;
3135
	pol->sadb_x_policy_priority = xp->priority;
L
Linus Torvalds 已提交
3136 3137 3138 3139 3140 3141 3142

	/* 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);

3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156
	/* 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
3157
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3158 3159
}

3160
static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3161
						u8 *data, int len, int *dir)
L
Linus Torvalds 已提交
3162
{
A
Alexey Dobriyan 已提交
3163
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3164 3165
	struct xfrm_policy *xp;
	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3166
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
3167

3168
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
3169 3170 3171 3172 3173 3174
	case AF_INET:
		if (opt != IP_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
E
Eric Dumazet 已提交
3175
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
	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
3196
	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
L
Linus Torvalds 已提交
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208
	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;
3209
	xp->family = sk->sk_family;
L
Linus Torvalds 已提交
3210 3211 3212 3213 3214 3215

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

3216 3217 3218 3219 3220 3221 3222 3223 3224
	/* 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 +
3225 3226
		    sec_ctx->sadb_x_sec_len) {
			*dir = -EINVAL;
3227
			goto out;
3228
		}
3229 3230 3231
		if ((*dir = verify_sec_ctx_len(p)))
			goto out;
		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3232
		*dir = security_xfrm_policy_alloc(&xp->security, uctx);
3233 3234 3235 3236 3237 3238
		kfree(uctx);

		if (*dir)
			goto out;
	}

L
Linus Torvalds 已提交
3239 3240 3241 3242
	*dir = pol->sadb_x_policy_dir-1;
	return xp;

out:
3243
	xp->walk.dead = 1;
3244
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
3245 3246 3247
	return NULL;
}

A
Al Viro 已提交
3248
static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
L
Linus Torvalds 已提交
3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276
{
	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)
	 */
3277

L
Linus Torvalds 已提交
3278 3279 3280 3281 3282
	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);
3283

L
Linus Torvalds 已提交
3284 3285 3286
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3287

L
Linus Torvalds 已提交
3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
	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);
3312
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3313 3314 3315 3316 3317
		(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;
3318 3319 3320 3321 3322
	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
3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334
		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);
3335
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3336 3337 3338 3339 3340
		(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;
3341 3342 3343 3344 3345
	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
3346 3347 3348 3349 3350 3351 3352 3353 3354
		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
3355
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3356 3357
}

3358 3359
#ifdef CONFIG_NET_KEY_MIGRATE
static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3360
			    const struct xfrm_selector *sel)
3361 3362 3363 3364 3365 3366 3367 3368 3369 3370
{
	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:
3371 3372 3373 3374
		addr->sadb_address_prefixlen = sel->prefixlen_s;
		pfkey_sockaddr_fill(&sel->saddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3375 3376
		break;
	case SADB_EXT_ADDRESS_DST:
3377 3378 3379 3380
		addr->sadb_address_prefixlen = sel->prefixlen_d;
		pfkey_sockaddr_fill(&sel->daddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3381 3382 3383 3384 3385 3386 3387 3388
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

3389

3390
static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414
{
	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;
}

3415 3416 3417
static int set_ipsecrequest(struct sk_buff *skb,
			    uint8_t proto, uint8_t mode, int level,
			    uint32_t reqid, uint8_t family,
3418
			    const xfrm_address_t *src, const xfrm_address_t *dst)
3419 3420
{
	struct sadb_x_ipsecrequest *rq;
3421 3422
	u8 *sa;
	int socklen = pfkey_sockaddr_len(family);
3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435
	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;

3436 3437 3438
	sa = (u8 *) (rq + 1);
	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3439 3440 3441 3442 3443 3444 3445
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_NET_KEY_MIGRATE
3446 3447 3448
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)
3449 3450 3451 3452 3453 3454 3455 3456
{
	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;
3457
	const struct xfrm_migrate *mp;
3458 3459 3460 3461 3462 3463 3464

	if (type != XFRM_POLICY_TYPE_MAIN)
		return 0;

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

3465 3466 3467 3468 3469 3470
	if (k != NULL) {
		/* addresses for KM */
		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
				     pfkey_sockaddr_pair_size(k->family));
	}

3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 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
	/* 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;

3507 3508
	/* Addresses to be used by KM for negotiation, if ext is available */
	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3509
		goto err;
3510

3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522
	/* 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;
3523
	pol->sadb_x_policy_reserved = 0;
3524 3525 3526 3527 3528
	pol->sadb_x_policy_id = 0;
	pol->sadb_x_policy_priority = 0;

	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old ipsecrequest */
3529 3530
		int mode = pfkey_mode_from_xfrm(mp->mode);
		if (mode < 0)
3531
			goto err;
3532
		if (set_ipsecrequest(skb, mp->proto, mode,
3533 3534
				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->old_family,
3535 3536
				     &mp->old_saddr, &mp->old_daddr) < 0)
			goto err;
3537 3538

		/* new ipsecrequest */
3539
		if (set_ipsecrequest(skb, mp->proto, mode,
3540 3541
				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->new_family,
3542 3543
				     &mp->new_saddr, &mp->new_daddr) < 0)
			goto err;
3544 3545 3546
	}

	/* broadcast migrate message to sockets */
A
Alexey Dobriyan 已提交
3547
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3548 3549

	return 0;
3550 3551 3552 3553

err:
	kfree_skb(skb);
	return -EINVAL;
3554 3555
}
#else
3556 3557 3558
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)
3559 3560 3561 3562 3563
{
	return -ENOPROTOOPT;
}
#endif

L
Linus Torvalds 已提交
3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
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;

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

	err = -EMSGSIZE;
3577
	if ((unsigned int)len > sk->sk_sndbuf - 32)
L
Linus Torvalds 已提交
3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592
		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;

A
Arjan van de Ven 已提交
3593
	mutex_lock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3594
	err = pfkey_process(sk, skb, hdr);
A
Arjan van de Ven 已提交
3595
	mutex_unlock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3596 3597 3598 3599

out:
	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
		err = 0;
3600
	kfree_skb(skb);
L
Linus Torvalds 已提交
3601 3602 3603 3604 3605 3606 3607 3608 3609

	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;
3610
	struct pfkey_sock *pfk = pfkey_sk(sk);
L
Linus Torvalds 已提交
3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628
	struct sk_buff *skb;
	int copied, err;

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

	msg->msg_namelen = 0;
	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;
	}

3629
	skb_reset_transport_header(skb);
L
Linus Torvalds 已提交
3630 3631 3632 3633
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free;

3634
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
3635 3636 3637

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

3638 3639 3640 3641
	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
3642 3643 3644 3645 3646 3647
out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

3648
static const struct proto_ops pfkey_ops = {
L
Linus Torvalds 已提交
3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
	.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,
};

3672
static const struct net_proto_family pfkey_family_ops = {
L
Linus Torvalds 已提交
3673 3674 3675 3676 3677 3678
	.family	=	PF_KEY,
	.create	=	pfkey_create,
	.owner	=	THIS_MODULE,
};

#ifdef CONFIG_PROC_FS
3679
static int pfkey_seq_show(struct seq_file *f, void *v)
L
Linus Torvalds 已提交
3680
{
3681
	struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
3682

3683 3684 3685
	if (v == SEQ_START_TOKEN)
		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
	else
D
Dan Rosenberg 已提交
3686
		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3687 3688
			       s,
			       atomic_read(&s->sk_refcnt),
3689 3690
			       sk_rmem_alloc_get(s),
			       sk_wmem_alloc_get(s),
3691
			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
L
Linus Torvalds 已提交
3692 3693
			       sock_i_ino(s)
			       );
3694 3695 3696 3697
	return 0;
}

static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3698
	__acquires(rcu)
3699
{
3700
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3701
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
L
Linus Torvalds 已提交
3702

S
stephen hemminger 已提交
3703 3704
	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3705 3706 3707 3708
}

static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
{
3709
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3710 3711
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

S
stephen hemminger 已提交
3712
	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3713
}
L
Linus Torvalds 已提交
3714

3715
static void pfkey_seq_stop(struct seq_file *f, void *v)
3716
	__releases(rcu)
3717
{
S
stephen hemminger 已提交
3718
	rcu_read_unlock();
3719
}
L
Linus Torvalds 已提交
3720

3721
static const struct seq_operations pfkey_seq_ops = {
3722 3723 3724 3725 3726
	.start	= pfkey_seq_start,
	.next	= pfkey_seq_next,
	.stop	= pfkey_seq_stop,
	.show	= pfkey_seq_show,
};
L
Linus Torvalds 已提交
3727

3728 3729
static int pfkey_seq_open(struct inode *inode, struct file *file)
{
3730 3731
	return seq_open_net(inode, file, &pfkey_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3732
}
3733

3734
static const struct file_operations pfkey_proc_ops = {
3735 3736 3737
	.open	 = pfkey_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
3738
	.release = seq_release_net,
3739 3740
};

3741
static int __net_init pfkey_init_proc(struct net *net)
3742
{
3743 3744
	struct proc_dir_entry *e;

3745
	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3746
	if (e == NULL)
3747
		return -ENOMEM;
3748 3749

	return 0;
3750 3751
}

3752
static void __net_exit pfkey_exit_proc(struct net *net)
3753
{
3754
	remove_proc_entry("pfkey", net->proc_net);
3755 3756
}
#else
3757
static inline int pfkey_init_proc(struct net *net)
3758 3759 3760 3761
{
	return 0;
}

3762
static inline void pfkey_exit_proc(struct net *net)
3763 3764
{
}
L
Linus Torvalds 已提交
3765 3766 3767 3768 3769 3770 3771 3772 3773
#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,
3774
	.notify_policy	= pfkey_send_policy_notify,
3775
	.migrate	= pfkey_send_migrate,
L
Linus Torvalds 已提交
3776 3777
};

A
Alexey Dobriyan 已提交
3778 3779
static int __net_init pfkey_net_init(struct net *net)
{
3780
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
A
Alexey Dobriyan 已提交
3781 3782 3783 3784
	int rv;

	INIT_HLIST_HEAD(&net_pfkey->table);
	atomic_set(&net_pfkey->socks_nr, 0);
3785

3786
	rv = pfkey_init_proc(net);
A
Alexey Dobriyan 已提交
3787 3788 3789 3790 3791 3792 3793 3794

	return rv;
}

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

3795
	pfkey_exit_proc(net);
A
Alexey Dobriyan 已提交
3796 3797 3798 3799 3800 3801
	BUG_ON(!hlist_empty(&net_pfkey->table));
}

static struct pernet_operations pfkey_net_ops = {
	.init = pfkey_net_init,
	.exit = pfkey_net_exit,
3802 3803
	.id   = &pfkey_net_id,
	.size = sizeof(struct netns_pfkey),
A
Alexey Dobriyan 已提交
3804 3805
};

L
Linus Torvalds 已提交
3806 3807 3808 3809
static void __exit ipsec_pfkey_exit(void)
{
	xfrm_unregister_km(&pfkeyv2_mgr);
	sock_unregister(PF_KEY);
3810
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3811 3812 3813 3814 3815 3816 3817 3818 3819 3820
	proto_unregister(&key_proto);
}

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

	if (err != 0)
		goto out;

3821
	err = register_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3822 3823
	if (err != 0)
		goto out_unregister_key_proto;
3824 3825 3826
	err = sock_register(&pfkey_family_ops);
	if (err != 0)
		goto out_unregister_pernet;
L
Linus Torvalds 已提交
3827 3828
	err = xfrm_register_km(&pfkeyv2_mgr);
	if (err != 0)
3829
		goto out_sock_unregister;
L
Linus Torvalds 已提交
3830 3831
out:
	return err;
3832

L
Linus Torvalds 已提交
3833 3834
out_sock_unregister:
	sock_unregister(PF_KEY);
3835 3836
out_unregister_pernet:
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3837 3838 3839 3840 3841 3842 3843 3844 3845
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);