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

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

#include <net/sock.h>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;
out:
	return err;
}

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

	if (!sk)
		return 0;

	pfkey_remove(sk);

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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	pfkey_terminate_dump(pfk);
	return rc;
}

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

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

	if (!skb)
		return -ENOBUFS;

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

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

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

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

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

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

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

	return uctx;
}

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

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

	return 1;
}

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

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

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

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

	return 0;
}

static uint16_t
pfkey_satype2proto(uint8_t satype)
{
	switch (satype) {
	case SADB_SATYPE_UNSPEC:
		return IPSEC_PROTO_ANY;
	case SADB_SATYPE_AH:
		return IPPROTO_AH;
	case SADB_SATYPE_ESP:
		return IPPROTO_ESP;
	case SADB_X_SATYPE_IPCOMP:
		return IPPROTO_COMP;
		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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	case AF_INET6:
		return sizeof(struct sockaddr_in6);
#endif
	}
	return 0;
}

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static
int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
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{
593
	switch (sa->sa_family) {
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	case AF_INET:
595
		xaddr->a4 =
596
			((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:
600
		memcpy(xaddr->a6,
601
		       &((struct sockaddr_in6 *)sa)->sin6_addr,
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		       sizeof(struct in6_addr));
		return AF_INET6;
#endif
	}
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	return 0;
}

static
610
int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
611 612 613
{
	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
				      xaddr);
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}

616
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;

637
	family = ((const struct sockaddr *)(addr + 1))->sa_family;
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	switch (family) {
	case AF_INET:
640
		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;

654
	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;
	}
}

694
static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
695 696
					struct sockaddr *sa,
					unsigned short family)
697 698 699 700 701 702 703 704 705 706 707
{
	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,
725
					      int add_keys, int hsc)
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{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_sa *sa;
	struct sadb_lifetime *lifetime;
	struct sadb_address *addr;
	struct sadb_key *key;
	struct sadb_x_sa2 *sa2;
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	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
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	int size;
	int auth_key_size = 0;
	int encrypt_key_size = 0;
	int sockaddr_size;
	struct xfrm_encap_tmpl *natt = NULL;
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	int mode;
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	/* address family check */
	sockaddr_size = pfkey_sockaddr_size(x->props.family);
	if (!sockaddr_size)
		return ERR_PTR(-EINVAL);

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

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

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

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

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

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

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

	sa->sadb_sa_flags = 0;
	if (x->props.flags & XFRM_STATE_NOECN)
		sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
		sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
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	if (x->props.flags & XFRM_STATE_NOPMTUDISC)
		sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
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	/* hard time */
	if (hsc & 2) {
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		lifetime = (struct sadb_lifetime *)  skb_put(skb,
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							     sizeof(struct sadb_lifetime));
		lifetime->sadb_lifetime_len =
			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
		lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
		lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
	}
	/* soft time */
	if (hsc & 1) {
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		lifetime = (struct sadb_lifetime *)  skb_put(skb,
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							     sizeof(struct sadb_lifetime));
		lifetime->sadb_lifetime_len =
			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
		lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
		lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
	}
	/* current time */
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
						     sizeof(struct sadb_lifetime));
	lifetime->sadb_lifetime_len =
		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
	lifetime->sadb_lifetime_allocations = x->curlft.packets;
	lifetime->sadb_lifetime_bytes = x->curlft.bytes;
	lifetime->sadb_lifetime_addtime = x->curlft.add_time;
	lifetime->sadb_lifetime_usetime = x->curlft.use_time;
	/* src address */
879
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
881
	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 */
888
	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

891 892 893 894 895
	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 */
899
	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
901
	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;
905
	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

908 909 910 911 912 913
	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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915 916
	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
			     x->props.family)) {
917 918 919 920 921 922 923 924 925 926
		addr = (struct sadb_address*) skb_put(skb,
			sizeof(struct sadb_address)+sockaddr_size);
		addr->sadb_address_len =
			(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
		addr->sadb_address_proto =
			pfkey_proto_from_xfrm(x->sel.proto);
		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
		addr->sadb_address_reserved = 0;
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		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
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	}

	/* auth key */
	if (add_keys && auth_key_size) {
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		key = (struct sadb_key *) skb_put(skb,
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						  sizeof(struct sadb_key)+auth_key_size);
		key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
			sizeof(uint64_t);
		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
		key->sadb_key_bits = x->aalg->alg_key_len;
		key->sadb_key_reserved = 0;
		memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
	}
	/* encrypt key */
	if (add_keys && encrypt_key_size) {
946
		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;
961 962 963 964 965
	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;
	}

999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
	/* 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
1013 1014 1015
	return skb;
}

1016

1017
static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1018 1019 1020 1021 1022 1023 1024 1025
{
	struct sk_buff *skb;

	skb = __pfkey_xfrm_state2msg(x, 1, 3);

	return skb;
}

1026
static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1027 1028 1029 1030 1031
							  int hsc)
{
	return __pfkey_xfrm_state2msg(x, 0, hsc);
}

A
Alexey Dobriyan 已提交
1032
static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1033 1034
						const struct sadb_msg *hdr,
						void * const *ext_hdrs)
L
Linus Torvalds 已提交
1035
{
1036
	struct xfrm_state *x;
1037 1038 1039 1040
	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
1041 1042
	uint16_t proto;
	int err;
1043

L
Linus Torvalds 已提交
1044

J
Joe Perches 已提交
1045
	sa = ext_hdrs[SADB_EXT_SA - 1];
L
Linus Torvalds 已提交
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 1074 1075
	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.

1076
	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
L
Linus Torvalds 已提交
1077 1078 1079 1080 1081 1082 1083
	   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
1084
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	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
1097
	x = xfrm_state_alloc(net);
L
Linus Torvalds 已提交
1098 1099 1100 1101 1102
	if (x == NULL)
		return ERR_PTR(-ENOBUFS);

	x->id.proto = proto;
	x->id.spi = sa->sadb_sa_spi;
1103 1104
	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
					(sizeof(x->replay.bitmap) * 8));
L
Linus Torvalds 已提交
1105 1106 1107 1108
	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;
1109 1110
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
L
Linus Torvalds 已提交
1111

J
Joe Perches 已提交
1112
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117 1118
	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
1119
	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
L
Linus Torvalds 已提交
1120 1121 1122 1123 1124 1125
	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;
	}
1126

J
Joe Perches 已提交
1127
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1128
	if (sec_ctx != NULL) {
1129
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140

		if (!uctx)
			goto out;

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

		if (err)
			goto out;
	}

J
Joe Perches 已提交
1141
	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
L
Linus Torvalds 已提交
1142 1143 1144
	if (sa->sadb_sa_auth) {
		int keysize = 0;
		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1145
		if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
			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);
		}
1160
		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
L
Linus Torvalds 已提交
1161 1162 1163 1164 1165 1166
		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);
1167
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
				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);
1179
			if (!a || !a->pfkey_supported) {
L
Linus Torvalds 已提交
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
				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; */

1200
	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
L
Linus Torvalds 已提交
1201
						    &x->props.saddr);
1202
	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
L
Linus Torvalds 已提交
1203 1204 1205
				  &x->id.daddr);

	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206
		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207 1208 1209 1210 1211 1212
		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
1213 1214 1215 1216
		x->props.reqid = sa2->sadb_x_sa2_reqid;
	}

	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217
		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
L
Linus Torvalds 已提交
1218 1219 1220 1221 1222 1223

		/* 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;
	}

1224
	if (!x->sel.family)
1225 1226
		x->sel.family = x->props.family;

L
Linus Torvalds 已提交
1227
	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228
		const struct sadb_x_nat_t_type* n_type;
L
Linus Torvalds 已提交
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
		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]) {
1240
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1241 1242 1243 1244
				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]) {
1245
			const struct sadb_x_nat_t_port *n_port =
L
Linus Torvalds 已提交
1246 1247 1248
				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
1249
		memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
L
Linus Torvalds 已提交
1250 1251
	}

H
Herbert Xu 已提交
1252 1253
	err = xfrm_init_state(x);
	if (err)
L
Linus Torvalds 已提交
1254
		goto out;
H
Herbert Xu 已提交
1255

L
Linus Torvalds 已提交
1256 1257 1258 1259 1260 1261 1262 1263 1264
	x->km.seq = hdr->sadb_msg_seq;
	return x;

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

1265
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
1266 1267 1268 1269
{
	return -EOPNOTSUPP;
}

1270
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
1271
{
A
Alexey Dobriyan 已提交
1272
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1273 1274 1275 1276
	struct sk_buff *resp_skb;
	struct sadb_x_sa2 *sa2;
	struct sadb_address *saddr, *daddr;
	struct sadb_msg *out_hdr;
1277
	struct sadb_spirange *range;
L
Linus Torvalds 已提交
1278
	struct xfrm_state *x = NULL;
1279
	int mode;
1280 1281
	int err;
	u32 min_spi, max_spi;
L
Linus Torvalds 已提交
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
	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) {
1296 1297 1298
		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0)
			return -EINVAL;
L
Linus Torvalds 已提交
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
		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
1314
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
1315 1316 1317 1318 1319 1320 1321 1322
	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) {
1323
		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324
		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
L
Linus Torvalds 已提交
1325 1326 1327 1328 1329 1330
			xfrm_state_put(x);
			x = NULL;
		}
	}

	if (!x)
1331
		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
L
Linus Torvalds 已提交
1332 1333 1334 1335

	if (x == NULL)
		return -ENOENT;

1336 1337
	min_spi = 0x100;
	max_spi = 0x0fffffff;
L
Linus Torvalds 已提交
1338

1339 1340 1341 1342
	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
1343
	}
1344

1345 1346 1347 1348 1349 1350
	err = verify_spi_info(x->id.proto, min_spi, max_spi);
	if (err) {
		xfrm_state_put(x);
		return err;
	}

1351
	err = xfrm_alloc_spi(x, min_spi, max_spi);
1352
	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369

	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
1370
	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
L
Linus Torvalds 已提交
1371 1372 1373 1374

	return 0;
}

1375
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
1376
{
A
Alexey Dobriyan 已提交
1377
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1378 1379 1380 1381 1382 1383 1384 1385
	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;

1386
	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
L
Linus Torvalds 已提交
1387 1388 1389 1390
	if (x == NULL)
		return 0;

	spin_lock_bh(&x->lock);
1391
	if (x->km.state == XFRM_STATE_ACQ)
L
Linus Torvalds 已提交
1392
		x->km.state = XFRM_STATE_ERROR;
1393

L
Linus Torvalds 已提交
1394 1395 1396 1397 1398
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return 0;
}

1399 1400 1401
static inline int event2poltype(int event)
{
	switch (event) {
1402
	case XFRM_MSG_DELPOLICY:
1403
		return SADB_X_SPDDELETE;
1404
	case XFRM_MSG_NEWPOLICY:
1405
		return SADB_X_SPDADD;
1406
	case XFRM_MSG_UPDPOLICY:
1407
		return SADB_X_SPDUPDATE;
1408
	case XFRM_MSG_POLEXPIRE:
1409 1410
	//	return SADB_X_SPDEXPIRE;
	default:
1411
		pr_err("pfkey: Unknown policy event %d\n", event);
1412 1413 1414 1415 1416 1417 1418 1419 1420
		break;
	}

	return 0;
}

static inline int event2keytype(int event)
{
	switch (event) {
1421
	case XFRM_MSG_DELSA:
1422
		return SADB_DELETE;
1423
	case XFRM_MSG_NEWSA:
1424
		return SADB_ADD;
1425
	case XFRM_MSG_UPDSA:
1426
		return SADB_UPDATE;
1427
	case XFRM_MSG_EXPIRE:
1428 1429
		return SADB_EXPIRE;
	default:
1430
		pr_err("pfkey: Unknown SA event %d\n", event);
1431 1432 1433 1434 1435 1436 1437
		break;
	}

	return 0;
}

/* ADD/UPD/DEL */
1438
static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1439 1440 1441 1442
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

1443
	skb = pfkey_xfrm_state2msg(x);
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454

	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;
1455
	hdr->sadb_msg_pid = c->portid;
1456

A
Alexey Dobriyan 已提交
1457
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1458 1459 1460

	return 0;
}
L
Linus Torvalds 已提交
1461

1462
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
1463
{
A
Alexey Dobriyan 已提交
1464
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1465 1466
	struct xfrm_state *x;
	int err;
1467
	struct km_event c;
L
Linus Torvalds 已提交
1468

A
Alexey Dobriyan 已提交
1469
	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1470 1471 1472
	if (IS_ERR(x))
		return PTR_ERR(x);

1473
	xfrm_state_hold(x);
L
Linus Torvalds 已提交
1474 1475 1476 1477 1478
	if (hdr->sadb_msg_type == SADB_ADD)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

1479
	xfrm_audit_state_add(x, err ? 0 : 1, true);
J
Joy Latten 已提交
1480

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

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

1499
static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
L
Linus Torvalds 已提交
1500
{
A
Alexey Dobriyan 已提交
1501
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1502
	struct xfrm_state *x;
1503 1504
	struct km_event c;
	int err;
L
Linus Torvalds 已提交
1505 1506 1507 1508 1509 1510

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

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

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

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

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

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

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

1536
	return err;
L
Linus Torvalds 已提交
1537 1538
}

1539
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
1540
{
A
Alexey Dobriyan 已提交
1541
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
	__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
1552
	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
L
Linus Torvalds 已提交
1553 1554 1555
	if (x == NULL)
		return -ESRCH;

1556
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1557 1558 1559 1560 1561 1562 1563
	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;
1564
	out_hdr->sadb_msg_type = SADB_GET;
L
Linus Torvalds 已提交
1565 1566 1567 1568 1569
	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
1570
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
L
Linus Torvalds 已提交
1571 1572 1573 1574

	return 0;
}

1575
static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
A
Al Viro 已提交
1576
					      gfp_t allocation)
L
Linus Torvalds 已提交
1577 1578 1579 1580 1581
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	int len, auth_len, enc_len, i;

1582
	auth_len = xfrm_count_pfkey_auth_supported();
L
Linus Torvalds 已提交
1583 1584 1585 1586
	if (auth_len) {
		auth_len *= sizeof(struct sadb_alg);
		auth_len += sizeof(struct sadb_supported);
	}
1587

1588
	enc_len = xfrm_count_pfkey_enc_supported();
L
Linus Torvalds 已提交
1589 1590 1591 1592
	if (enc_len) {
		enc_len *= sizeof(struct sadb_alg);
		enc_len += sizeof(struct sadb_supported);
	}
1593

L
Linus Torvalds 已提交
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
	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;
1619 1620
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
			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;
1640 1641
			if (!ealg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
1642 1643 1644 1645 1646 1647 1648 1649 1650
			if (ealg->available)
				*ap++ = ealg->desc;
		}
	}

out_put_algs:
	return skb;
}

1651
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
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
{
	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();
1666

L
Linus Torvalds 已提交
1667 1668 1669 1670 1671 1672 1673 1674
	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
1675
	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
L
Linus Torvalds 已提交
1676 1677 1678 1679

	return 0;
}

1680
static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
{
	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));
}

1697
static int key_notify_sa_flush(const struct km_event *c)
1698 1699 1700 1701 1702 1703 1704 1705
{
	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));
1706
	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
J
Jerome Borsboom 已提交
1707
	hdr->sadb_msg_type = SADB_FLUSH;
1708
	hdr->sadb_msg_seq = c->seq;
1709
	hdr->sadb_msg_pid = c->portid;
1710 1711 1712
	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));
1713
	hdr->sadb_msg_reserved = 0;
1714

A
Alexey Dobriyan 已提交
1715
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716 1717 1718 1719

	return 0;
}

1720
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
1721
{
A
Alexey Dobriyan 已提交
1722
	struct net *net = sock_net(sk);
1723
	unsigned int proto;
1724
	struct km_event c;
1725
	int err, err2;
L
Linus Torvalds 已提交
1726 1727 1728 1729 1730

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

1731
	err = xfrm_state_flush(net, proto, true);
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
}

static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
1787 1788 1789
	struct net *net = sock_net(&pfk->sk);

	xfrm_state_walk_done(&pfk->dump.u.state, net);
1790 1791
}

1792
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
1793 1794
{
	u8 proto;
1795
	struct xfrm_address_filter *filter = NULL;
1796 1797 1798 1799
	struct pfkey_sock *pfk = pfkey_sk(sk);

	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804

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

1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
	if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
		struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];

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

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

1821
	pfk->dump.msg_version = hdr->sadb_msg_version;
1822
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1823 1824
	pfk->dump.dump = pfkey_dump_sa;
	pfk->dump.done = pfkey_dump_sa_done;
1825
	xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1826

1827
	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
1828 1829
}

1830
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
1831 1832 1833
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;
1834
	bool reset_errno = false;
L
Linus Torvalds 已提交
1835 1836

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1837
		reset_errno = true;
L
Linus Torvalds 已提交
1838 1839 1840 1841
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
	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
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	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
1868
static u32 gen_reqid(struct net *net)
L
Linus Torvalds 已提交
1869
{
1870
	struct xfrm_policy_walk walk;
L
Linus Torvalds 已提交
1871
	u32 start;
1872
	int rc;
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878 1879
	static u32 reqid = IPSEC_MANUAL_REQID_MAX;

	start = reqid;
	do {
		++reqid;
		if (reqid == 0)
			reqid = IPSEC_MANUAL_REQID_MAX+1;
1880
		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
A
Alexey Dobriyan 已提交
1881
		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
F
Fan Du 已提交
1882
		xfrm_policy_walk_done(&walk, net);
1883
		if (rc != -EEXIST)
L
Linus Torvalds 已提交
1884 1885 1886 1887 1888 1889 1890 1891
			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
1892
	struct net *net = xp_net(xp);
L
Linus Torvalds 已提交
1893
	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1894
	int mode;
L
Linus Torvalds 已提交
1895 1896 1897 1898 1899 1900 1901 1902

	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 */
1903 1904 1905
	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	t->mode = mode;
L
Linus Torvalds 已提交
1906 1907 1908 1909 1910 1911
	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
1912
		if (!t->reqid && !(t->reqid = gen_reqid(net)))
L
Linus Torvalds 已提交
1913 1914 1915 1916
			return -ENOBUFS;
	}

	/* addresses present only in tunnel mode */
1917
	if (t->mode == XFRM_MODE_TUNNEL) {
1918 1919 1920 1921 1922 1923
		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
1924
			return -EINVAL;
1925 1926 1927 1928 1929 1930

		socklen = pfkey_sockaddr_len(family);
		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
					   &t->id.daddr) != family)
			return -EINVAL;
		t->encap_family = family;
1931 1932 1933
	} else
		t->encap_family = xp->family;

L
Linus Torvalds 已提交
1934
	/* No way to set this via kame pfkey */
1935
	t->allalgs = 1;
L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
	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);

1947 1948 1949
	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
		return -EINVAL;

L
Linus Torvalds 已提交
1950 1951 1952 1953 1954 1955 1956 1957 1958
	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;
}

1959
static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
{
  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;
}

1971
static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1972
{
1973
	const struct xfrm_tmpl *t;
L
Linus Torvalds 已提交
1974
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1975 1976 1977 1978 1979
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
1980
		socklen += pfkey_sockaddr_len(t->encap_family);
1981
	}
L
Linus Torvalds 已提交
1982 1983 1984

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
1985
		(sizeof(struct sadb_address) * 2) +
L
Linus Torvalds 已提交
1986 1987
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
1988 1989
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
1990
		pfkey_xfrm_policy2sec_ctx_size(xp);
L
Linus Torvalds 已提交
1991 1992
}

1993
static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
L
Linus Torvalds 已提交
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
{
	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;
}

2007
static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
L
Linus Torvalds 已提交
2008 2009 2010 2011 2012
{
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_lifetime *lifetime;
	struct sadb_x_policy *pol;
2013 2014
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
L
Linus Torvalds 已提交
2015 2016 2017
	int i;
	int size;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2018
	int socklen = pfkey_sockaddr_len(xp->family);
L
Linus Torvalds 已提交
2019 2020 2021 2022 2023 2024 2025 2026

	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 */
2027
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2028
					      sizeof(struct sadb_address)+sockaddr_size);
2029
	addr->sadb_address_len =
L
Linus Torvalds 已提交
2030 2031 2032 2033 2034 2035
		(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;
2036 2037 2038 2039
	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
				 xp->selector.sport,
				 (struct sockaddr *) (addr + 1),
				 xp->family))
L
Linus Torvalds 已提交
2040 2041 2042
		BUG();

	/* dst address */
2043
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2044 2045 2046 2047 2048 2049
					      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);
2050
	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
L
Linus Torvalds 已提交
2051
	addr->sadb_address_reserved = 0;
2052 2053 2054 2055

	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
			    (struct sockaddr *) (addr + 1),
			    xp->family);
L
Linus Torvalds 已提交
2056 2057

	/* hard time */
2058
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2059 2060 2061 2062 2063 2064 2065 2066 2067
						     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 */
2068
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2069 2070 2071 2072 2073 2074 2075 2076 2077
						     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 */
2078
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098
						     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;
2099
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
2100 2101 2102 2103
	pol->sadb_x_policy_id = xp->index;
	pol->sadb_x_policy_priority = xp->priority;

	for (i=0; i<xp->xfrm_nr; i++) {
2104
		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
L
Linus Torvalds 已提交
2105 2106
		struct sadb_x_ipsecrequest *rq;
		int req_size;
2107
		int mode;
L
Linus Torvalds 已提交
2108 2109

		req_size = sizeof(struct sadb_x_ipsecrequest);
2110 2111 2112 2113
		if (t->mode == XFRM_MODE_TUNNEL) {
			socklen = pfkey_sockaddr_len(t->encap_family);
			req_size += socklen * 2;
		} else {
L
Linus Torvalds 已提交
2114
			size -= 2*socklen;
2115
		}
L
Linus Torvalds 已提交
2116 2117 2118 2119 2120
		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;
2121 2122
		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
			return -EINVAL;
2123
		rq->sadb_x_ipsecrequest_mode = mode;
L
Linus Torvalds 已提交
2124 2125 2126 2127 2128 2129
		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;
2130

2131
		if (t->mode == XFRM_MODE_TUNNEL) {
2132 2133 2134 2135 2136 2137 2138
			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
2139 2140
		}
	}
2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155

	/* 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
2156 2157
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2158 2159

	return 0;
L
Linus Torvalds 已提交
2160 2161
}

2162
static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2163 2164 2165 2166 2167 2168
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	int err;

	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2169 2170 2171
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2172 2173 2174
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
2175 2176 2177 2178

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

2179
	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2180 2181 2182 2183 2184
		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;
2185
	out_hdr->sadb_msg_pid = c->portid;
A
Alexey Dobriyan 已提交
2186
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2187 2188 2189 2190
	return 0;

}

2191
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
2192
{
A
Alexey Dobriyan 已提交
2193
	struct net *net = sock_net(sk);
2194
	int err = 0;
L
Linus Torvalds 已提交
2195 2196 2197 2198
	struct sadb_lifetime *lifetime;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2199
	struct km_event c;
2200
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212

	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
2213
	xp = xfrm_policy_alloc(net, GFP_KERNEL);
L
Linus Torvalds 已提交
2214 2215 2216 2217 2218 2219 2220
	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
2221
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2222 2223 2224 2225 2226 2227
	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)
2228
		xp->selector.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2229

J
Junwei Zhang 已提交
2230
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	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)
2241
		xp->selector.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2242

J
Joe Perches 已提交
2243
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2244
	if (sec_ctx != NULL) {
2245
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2246 2247 2248 2249 2250 2251

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

2252
		err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2253 2254 2255 2256 2257 2258
		kfree(uctx);

		if (err)
			goto out;
	}

L
Linus Torvalds 已提交
2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
	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);
2282

2283
	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
J
Joy Latten 已提交
2284

2285 2286
	if (err)
		goto out;
L
Linus Torvalds 已提交
2287

2288
	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2289
		c.event = XFRM_MSG_UPDPOLICY;
2290
	else
2291
		c.event = XFRM_MSG_NEWPOLICY;
L
Linus Torvalds 已提交
2292

2293
	c.seq = hdr->sadb_msg_seq;
2294
	c.portid = hdr->sadb_msg_pid;
L
Linus Torvalds 已提交
2295

2296 2297
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
2298 2299 2300
	return 0;

out:
H
Herbert Xu 已提交
2301
	xp->walk.dead = 1;
2302
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
2303 2304 2305
	return err;
}

2306
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
2307
{
A
Alexey Dobriyan 已提交
2308
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2309 2310 2311
	int err;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
2312
	struct xfrm_policy *xp;
L
Linus Torvalds 已提交
2313
	struct xfrm_selector sel;
2314
	struct km_event c;
2315
	struct sadb_x_sec_ctx *sec_ctx;
2316
	struct xfrm_sec_ctx *pol_ctx = NULL;
L
Linus Torvalds 已提交
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328

	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
2329
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
L
Linus Torvalds 已提交
2330 2331 2332 2333 2334
	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)
2335
		sel.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2336

J
Junwei Zhang 已提交
2337
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
L
Linus Torvalds 已提交
2338 2339 2340 2341 2342
	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)
2343
		sel.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2344

J
Joe Perches 已提交
2345
	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2346
	if (sec_ctx != NULL) {
2347
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2348 2349 2350 2351

		if (!uctx)
			return -ENOMEM;

2352
		err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2353 2354 2355
		kfree(uctx);
		if (err)
			return err;
2356
	}
J
Joy Latten 已提交
2357

2358
	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2359 2360 2361
				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
				   1, &err);
	security_xfrm_policy_free(pol_ctx);
L
Linus Torvalds 已提交
2362 2363 2364
	if (xp == NULL)
		return -ENOENT;

2365
	xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2366 2367

	if (err)
C
Catherine Zhang 已提交
2368
		goto out;
2369

2370
	c.seq = hdr->sadb_msg_seq;
2371
	c.portid = hdr->sadb_msg_pid;
2372
	c.data.byid = 0;
2373
	c.event = XFRM_MSG_DELPOLICY;
2374 2375
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);

C
Catherine Zhang 已提交
2376
out:
2377
	xfrm_pol_put(xp);
2378 2379
	if (err == 0)
		xfrm_garbage_collect(net);
2380 2381 2382
	return err;
}

2383
static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2384 2385 2386 2387 2388 2389
{
	int err;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	err = 0;

L
Linus Torvalds 已提交
2390 2391 2392 2393 2394
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err =  PTR_ERR(out_skb);
		goto out;
	}
2395 2396 2397
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
2398 2399 2400

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2401
	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
L
Linus Torvalds 已提交
2402 2403 2404 2405
	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
2406
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
L
Linus Torvalds 已提交
2407 2408 2409 2410 2411 2412
	err = 0;

out:
	return err;
}

2413 2414 2415
#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_sockaddr_pair_size(sa_family_t family)
{
2416
	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2417 2418
}

2419
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2420 2421 2422
			       xfrm_address_t *saddr, xfrm_address_t *daddr,
			       u16 *family)
{
2423 2424
	int af, socklen;

2425
	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2426 2427
		return -EINVAL;

2428
	af = pfkey_sockaddr_extract(sa, saddr);
2429 2430 2431 2432
	if (!af)
		return -EINVAL;

	socklen = pfkey_sockaddr_len(af);
2433
	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2434
				   daddr) != af)
2435 2436
		return -EINVAL;

2437
	*family = af;
2438 2439 2440 2441 2442 2443 2444 2445
	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;
2446
	int mode;
2447 2448 2449 2450 2451 2452

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

	/* old endoints */
2453 2454 2455
	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
				  rq1->sadb_x_ipsecrequest_len,
				  &m->old_saddr, &m->old_daddr,
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467
				  &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 */
2468 2469 2470
	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
				  rq2->sadb_x_ipsecrequest_len,
				  &m->new_saddr, &m->new_daddr,
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
				  &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;
2481 2482 2483
	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	m->mode = mode;
2484 2485 2486 2487 2488 2489 2490
	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,
2491
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2492 2493 2494 2495
{
	int i, len, ret, err = -EINVAL;
	u8 dir;
	struct sadb_address *sa;
2496
	struct sadb_x_kmaddress *kma;
2497 2498 2499 2500
	struct sadb_x_policy *pol;
	struct sadb_x_ipsecrequest *rq;
	struct xfrm_selector sel;
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2501
	struct xfrm_kmaddress k;
2502
	struct net *net = sock_net(sk);
2503 2504

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2505
				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2506 2507 2508 2509 2510
	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
		err = -EINVAL;
		goto out;
	}

2511
	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2512 2513 2514 2515 2516 2517 2518
	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];

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

2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
	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;
		}
	}

2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
	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
2541
		sel.sport_mask = htons(0xffff);
2542 2543 2544 2545 2546 2547 2548 2549

	/* 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
2550
		sel.dport_mask = htons(0xffff);
2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574

	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;
	}

2575
	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2576
			    kma ? &k : NULL, net);
2577 2578 2579 2580 2581 2582

 out:
	return err;
}
#else
static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
S
Stephen Hemminger 已提交
2583
			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2584 2585 2586 2587 2588 2589
{
	return -ENOPROTOOPT;
}
#endif


2590
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
2591
{
A
Alexey Dobriyan 已提交
2592
	struct net *net = sock_net(sk);
2593
	unsigned int dir;
2594
	int err = 0, delete;
L
Linus Torvalds 已提交
2595 2596
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2597
	struct km_event c;
L
Linus Torvalds 已提交
2598 2599 2600 2601

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

2602 2603 2604 2605
	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

2606
	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2607
	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2608
			      dir, pol->sadb_x_policy_id, delete, &err);
L
Linus Torvalds 已提交
2609 2610 2611
	if (xp == NULL)
		return -ENOENT;

2612
	if (delete) {
2613
		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
L
Linus Torvalds 已提交
2614

2615 2616 2617
		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
2618
		c.portid = hdr->sadb_msg_pid;
2619
		c.data.byid = 1;
2620
		c.event = XFRM_MSG_DELPOLICY;
2621
		km_policy_notify(xp, dir, &c);
2622
	} else {
2623
		err = key_pol_get_resp(sk, xp, hdr, dir);
L
Linus Torvalds 已提交
2624 2625
	}

2626
out:
L
Linus Torvalds 已提交
2627
	xfrm_pol_put(xp);
2628 2629
	if (delete && err == 0)
		xfrm_garbage_collect(net);
L
Linus Torvalds 已提交
2630 2631 2632 2633 2634
	return err;
}

static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
2635
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
2636 2637
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2638
	int err;
L
Linus Torvalds 已提交
2639

2640 2641 2642
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

L
Linus Torvalds 已提交
2643 2644 2645 2646
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2647 2648 2649
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2650 2651

	out_hdr = (struct sadb_msg *) out_skb->data;
2652
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
2653 2654 2655
	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
2656
	out_hdr->sadb_msg_seq = count + 1;
2657
	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
H
Herbert Xu 已提交
2658 2659 2660

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
A
Alexey Dobriyan 已提交
2661
				&pfk->sk, sock_net(&pfk->sk));
H
Herbert Xu 已提交
2662 2663
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
2664 2665 2666
	return 0;
}

2667 2668
static int pfkey_dump_sp(struct pfkey_sock *pfk)
{
A
Alexey Dobriyan 已提交
2669 2670
	struct net *net = sock_net(&pfk->sk);
	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2671 2672 2673 2674
}

static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
{
F
Fan Du 已提交
2675 2676 2677
	struct net *net = sock_net((struct sock *)pfk);

	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2678 2679
}

2680
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
2681
{
2682
	struct pfkey_sock *pfk = pfkey_sk(sk);
2683

2684 2685
	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
2686

2687
	pfk->dump.msg_version = hdr->sadb_msg_version;
2688
	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2689 2690 2691 2692 2693
	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
2694 2695
}

2696
static int key_notify_policy_flush(const struct km_event *c)
L
Linus Torvalds 已提交
2697 2698
{
	struct sk_buff *skb_out;
2699
	struct sadb_msg *hdr;
L
Linus Torvalds 已提交
2700

2701
	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
L
Linus Torvalds 已提交
2702 2703
	if (!skb_out)
		return -ENOBUFS;
2704
	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
J
Jerome Borsboom 已提交
2705
	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2706
	hdr->sadb_msg_seq = c->seq;
2707
	hdr->sadb_msg_pid = c->portid;
2708 2709
	hdr->sadb_msg_version = PF_KEY_V2;
	hdr->sadb_msg_errno = (uint8_t) 0;
2710
	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711
	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2712
	hdr->sadb_msg_reserved = 0;
A
Alexey Dobriyan 已提交
2713
	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2714
	return 0;
L
Linus Torvalds 已提交
2715

2716 2717
}

2718
static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2719
{
A
Alexey Dobriyan 已提交
2720
	struct net *net = sock_net(sk);
2721
	struct km_event c;
2722
	int err, err2;
L
Linus Torvalds 已提交
2723

2724
	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2725
	err2 = unicast_flush_resp(sk, hdr);
2726 2727 2728 2729 2730
	if (err || err2) {
		if (err == -ESRCH) /* empty table - old silent behavior */
			return 0;
		return err;
	}
2731

2732
	c.data.type = XFRM_POLICY_TYPE_MAIN;
2733
	c.event = XFRM_MSG_FLUSHPOLICY;
2734
	c.portid = hdr->sadb_msg_pid;
2735
	c.seq = hdr->sadb_msg_seq;
A
Alexey Dobriyan 已提交
2736
	c.net = net;
2737
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
2738 2739 2740 2741 2742

	return 0;
}

typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2743
			     const struct sadb_msg *hdr, void * const *ext_hdrs);
M
Mathias Krause 已提交
2744
static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
L
Linus Torvalds 已提交
2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766
	[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,
2767
	[SADB_X_MIGRATE]	= pfkey_migrate,
L
Linus Torvalds 已提交
2768 2769
};

2770
static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
L
Linus Torvalds 已提交
2771 2772 2773 2774 2775
{
	void *ext_hdrs[SADB_EXT_MAX];
	int err;

	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
A
Alexey Dobriyan 已提交
2776
			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
L
Linus Torvalds 已提交
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814

	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;
}

2815 2816
static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2817
{
2818 2819 2820 2821 2822 2823
	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
2824 2825
}

2826 2827
static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
				const struct xfrm_algo_desc *d)
L
Linus Torvalds 已提交
2828
{
2829 2830 2831 2832 2833 2834
	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
2835 2836
}

2837
static int count_ah_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2838 2839 2840 2841
{
	int i, sz = 0;

	for (i = 0; ; i++) {
2842
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2843 2844
		if (!aalg)
			break;
2845 2846
		if (!aalg->pfkey_supported)
			continue;
L
Linus Torvalds 已提交
2847 2848 2849 2850 2851 2852
		if (aalg_tmpl_set(t, aalg) && aalg->available)
			sz += sizeof(struct sadb_comb);
	}
	return sz + sizeof(struct sadb_prop);
}

2853
static int count_esp_combs(const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2854 2855 2856 2857
{
	int i, k, sz = 0;

	for (i = 0; ; i++) {
2858
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2859 2860
		if (!ealg)
			break;
2861

2862 2863 2864
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2865 2866
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2867

L
Linus Torvalds 已提交
2868
		for (k = 1; ; k++) {
2869
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2870 2871
			if (!aalg)
				break;
2872

2873 2874 2875
			if (!aalg->pfkey_supported)
				continue;

L
Linus Torvalds 已提交
2876 2877 2878 2879 2880 2881 2882
			if (aalg_tmpl_set(t, aalg) && aalg->available)
				sz += sizeof(struct sadb_comb);
		}
	}
	return sz + sizeof(struct sadb_prop);
}

2883
static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
{
	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++) {
2895
		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
L
Linus Torvalds 已提交
2896 2897 2898
		if (!aalg)
			break;

2899 2900 2901
		if (!aalg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917
		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;
		}
	}
}

2918
static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
L
Linus Torvalds 已提交
2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929
{
	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++) {
2930
		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
L
Linus Torvalds 已提交
2931 2932
		if (!ealg)
			break;
2933

2934 2935 2936
		if (!ealg->pfkey_supported)
			continue;

L
Linus Torvalds 已提交
2937 2938
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2939

L
Linus Torvalds 已提交
2940 2941
		for (k = 1; ; k++) {
			struct sadb_comb *c;
2942
			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
L
Linus Torvalds 已提交
2943 2944
			if (!aalg)
				break;
2945 2946
			if (!aalg->pfkey_supported)
				continue;
L
Linus Torvalds 已提交
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
			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;
		}
	}
}

2966
static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2967 2968 2969 2970
{
	return 0;
}

2971
static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
L
Linus Torvalds 已提交
2972 2973 2974
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2975 2976 2977
	int hard;
	int hsc;

2978
	hard = c->data.hard;
2979 2980 2981 2982
	if (hard)
		hsc = 2;
	else
		hsc = 1;
L
Linus Torvalds 已提交
2983

2984
	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
L
Linus Torvalds 已提交
2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996
	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
2997
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
2998 2999 3000
	return 0;
}

3001
static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3002
{
A
Alexey Dobriyan 已提交
3003
	struct net *net = x ? xs_net(x) : c->net;
A
Alexey Dobriyan 已提交
3004 3005 3006
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

	if (atomic_read(&net_pfkey->socks_nr) == 0)
3007 3008
		return 0;

3009
	switch (c->event) {
3010
	case XFRM_MSG_EXPIRE:
3011
		return key_notify_sa_expire(x, c);
3012 3013 3014
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
3015
		return key_notify_sa(x, c);
3016
	case XFRM_MSG_FLUSHSA:
3017
		return key_notify_sa_flush(c);
J
Jamal Hadi Salim 已提交
3018 3019
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
3020
	default:
3021
		pr_err("pfkey: Unknown SA event %d\n", c->event);
3022 3023 3024 3025 3026 3027
		break;
	}

	return 0;
}

3028
static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3029
{
3030 3031 3032
	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
		return 0;

3033
	switch (c->event) {
3034
	case XFRM_MSG_POLEXPIRE:
3035
		return key_notify_policy_expire(xp, c);
3036 3037 3038
	case XFRM_MSG_DELPOLICY:
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
3039
		return key_notify_policy(xp, dir, c);
3040
	case XFRM_MSG_FLUSHPOLICY:
3041 3042
		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
			break;
3043 3044
		return key_notify_policy_flush(c);
	default:
3045
		pr_err("pfkey: Unknown policy event %d\n", c->event);
3046 3047 3048 3049 3050 3051
		break;
	}

	return 0;
}

L
Linus Torvalds 已提交
3052 3053 3054
static u32 get_acqseq(void)
{
	u32 res;
3055
	static atomic_t acqseq;
L
Linus Torvalds 已提交
3056

3057 3058 3059
	do {
		res = atomic_inc_return(&acqseq);
	} while (!res);
L
Linus Torvalds 已提交
3060 3061 3062
	return res;
}

3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080
static bool pfkey_is_alive(const struct km_event *c)
{
	struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
	struct sock *sk;
	bool is_alive = false;

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

	return is_alive;
}

3081
static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
L
Linus Torvalds 已提交
3082 3083 3084 3085 3086 3087 3088
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_x_policy *pol;
	int sockaddr_size;
	int size;
3089 3090 3091
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
3092

L
Linus Torvalds 已提交
3093 3094 3095 3096 3097 3098 3099 3100
	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);
3101

L
Linus Torvalds 已提交
3102 3103 3104 3105 3106
	if (x->id.proto == IPPROTO_AH)
		size += count_ah_combs(t);
	else if (x->id.proto == IPPROTO_ESP)
		size += count_esp_combs(t);

3107 3108 3109 3110 3111
	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
3112 3113 3114
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3115

L
Linus Torvalds 已提交
3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
	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 */
3127
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3128
					      sizeof(struct sadb_address)+sockaddr_size);
3129
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3130 3131 3132 3133 3134
		(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;
3135 3136 3137 3138 3139
	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
3140
		BUG();
3141

L
Linus Torvalds 已提交
3142
	/* dst address */
3143
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3144 3145 3146 3147 3148 3149 3150
					      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;
3151 3152 3153 3154 3155
	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
3156 3157 3158 3159 3160 3161
		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;
3162
	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3163
	pol->sadb_x_policy_reserved = 0;
L
Linus Torvalds 已提交
3164
	pol->sadb_x_policy_id = xp->index;
3165
	pol->sadb_x_policy_priority = xp->priority;
L
Linus Torvalds 已提交
3166 3167 3168 3169 3170 3171 3172

	/* 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);

3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186
	/* 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
3187
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3188 3189
}

3190
static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3191
						u8 *data, int len, int *dir)
L
Linus Torvalds 已提交
3192
{
A
Alexey Dobriyan 已提交
3193
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3194 3195
	struct xfrm_policy *xp;
	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3196
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
3197

3198
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
3199 3200 3201 3202 3203 3204
	case AF_INET:
		if (opt != IP_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
E
Eric Dumazet 已提交
3205
#if IS_ENABLED(CONFIG_IPV6)
L
Linus Torvalds 已提交
3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
	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
3226
	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
L
Linus Torvalds 已提交
3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238
	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;
3239
	xp->family = sk->sk_family;
L
Linus Torvalds 已提交
3240 3241 3242 3243 3244 3245

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

3246 3247 3248 3249 3250 3251 3252 3253 3254
	/* 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 +
3255 3256
		    sec_ctx->sadb_x_sec_len) {
			*dir = -EINVAL;
3257
			goto out;
3258
		}
3259 3260
		if ((*dir = verify_sec_ctx_len(p)))
			goto out;
3261
		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3262
		*dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3263 3264 3265 3266 3267 3268
		kfree(uctx);

		if (*dir)
			goto out;
	}

L
Linus Torvalds 已提交
3269 3270 3271 3272
	*dir = pol->sadb_x_policy_dir-1;
	return xp;

out:
3273
	xp->walk.dead = 1;
3274
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
3275 3276 3277
	return NULL;
}

A
Al Viro 已提交
3278
static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
L
Linus Torvalds 已提交
3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306
{
	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)
	 */
3307

L
Linus Torvalds 已提交
3308 3309 3310 3311 3312
	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);
3313

L
Linus Torvalds 已提交
3314 3315 3316
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3317

L
Linus Torvalds 已提交
3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341
	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);
3342
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3343 3344 3345 3346 3347
		(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;
3348 3349 3350 3351 3352
	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
3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364
		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);
3365
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3366 3367 3368 3369 3370
		(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;
3371 3372 3373 3374 3375
	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
3376 3377 3378 3379 3380 3381 3382 3383 3384
		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
3385
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
L
Linus Torvalds 已提交
3386 3387
}

3388 3389
#ifdef CONFIG_NET_KEY_MIGRATE
static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3390
			    const struct xfrm_selector *sel)
3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
{
	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:
3401 3402 3403 3404
		addr->sadb_address_prefixlen = sel->prefixlen_s;
		pfkey_sockaddr_fill(&sel->saddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3405 3406
		break;
	case SADB_EXT_ADDRESS_DST:
3407 3408 3409 3410
		addr->sadb_address_prefixlen = sel->prefixlen_d;
		pfkey_sockaddr_fill(&sel->daddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3411 3412 3413 3414 3415 3416 3417 3418
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

3419

3420
static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444
{
	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;
}

3445 3446 3447
static int set_ipsecrequest(struct sk_buff *skb,
			    uint8_t proto, uint8_t mode, int level,
			    uint32_t reqid, uint8_t family,
3448
			    const xfrm_address_t *src, const xfrm_address_t *dst)
3449 3450
{
	struct sadb_x_ipsecrequest *rq;
3451 3452
	u8 *sa;
	int socklen = pfkey_sockaddr_len(family);
3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465
	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;

3466 3467 3468
	sa = (u8 *) (rq + 1);
	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3469 3470 3471 3472 3473 3474 3475
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_NET_KEY_MIGRATE
3476 3477 3478
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)
3479 3480 3481 3482 3483 3484 3485 3486
{
	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;
3487
	const struct xfrm_migrate *mp;
3488 3489 3490 3491 3492 3493 3494

	if (type != XFRM_POLICY_TYPE_MAIN)
		return 0;

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

3495 3496 3497 3498 3499 3500
	if (k != NULL) {
		/* addresses for KM */
		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
				     pfkey_sockaddr_pair_size(k->family));
	}

3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536
	/* 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;

3537 3538
	/* Addresses to be used by KM for negotiation, if ext is available */
	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3539
		goto err;
3540

3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552
	/* 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;
3553
	pol->sadb_x_policy_reserved = 0;
3554 3555 3556 3557 3558
	pol->sadb_x_policy_id = 0;
	pol->sadb_x_policy_priority = 0;

	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old ipsecrequest */
3559 3560
		int mode = pfkey_mode_from_xfrm(mp->mode);
		if (mode < 0)
3561
			goto err;
3562
		if (set_ipsecrequest(skb, mp->proto, mode,
3563 3564
				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->old_family,
3565 3566
				     &mp->old_saddr, &mp->old_daddr) < 0)
			goto err;
3567 3568

		/* new ipsecrequest */
3569
		if (set_ipsecrequest(skb, mp->proto, mode,
3570 3571
				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->new_family,
3572 3573
				     &mp->new_saddr, &mp->new_daddr) < 0)
			goto err;
3574 3575 3576
	}

	/* broadcast migrate message to sockets */
A
Alexey Dobriyan 已提交
3577
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3578 3579

	return 0;
3580 3581 3582 3583

err:
	kfree_skb(skb);
	return -EINVAL;
3584 3585
}
#else
3586 3587 3588
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)
3589 3590 3591 3592 3593
{
	return -ENOPROTOOPT;
}
#endif

L
Linus Torvalds 已提交
3594 3595 3596 3597 3598 3599 3600
static int pfkey_sendmsg(struct kiocb *kiocb,
			 struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb = NULL;
	struct sadb_msg *hdr = NULL;
	int err;
F
Fan Du 已提交
3601
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3602 3603 3604 3605 3606 3607

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

	err = -EMSGSIZE;
3608
	if ((unsigned int)len > sk->sk_sndbuf - 32)
L
Linus Torvalds 已提交
3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623
		goto out;

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

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

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

F
Fan Du 已提交
3624
	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3625
	err = pfkey_process(sk, skb, hdr);
F
Fan Du 已提交
3626
	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3627 3628 3629 3630

out:
	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
		err = 0;
3631
	kfree_skb(skb);
L
Linus Torvalds 已提交
3632 3633 3634 3635 3636 3637 3638 3639 3640

	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;
3641
	struct pfkey_sock *pfk = pfkey_sk(sk);
L
Linus Torvalds 已提交
3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658
	struct sk_buff *skb;
	int copied, err;

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

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

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

3659
	skb_reset_transport_header(skb);
L
Linus Torvalds 已提交
3660 3661 3662 3663
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free;

3664
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
3665 3666 3667

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

3668 3669 3670 3671
	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
3672 3673 3674 3675 3676 3677
out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

3678
static const struct proto_ops pfkey_ops = {
L
Linus Torvalds 已提交
3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701
	.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,
};

3702
static const struct net_proto_family pfkey_family_ops = {
L
Linus Torvalds 已提交
3703 3704 3705 3706 3707 3708
	.family	=	PF_KEY,
	.create	=	pfkey_create,
	.owner	=	THIS_MODULE,
};

#ifdef CONFIG_PROC_FS
3709
static int pfkey_seq_show(struct seq_file *f, void *v)
L
Linus Torvalds 已提交
3710
{
3711
	struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
3712

3713 3714 3715
	if (v == SEQ_START_TOKEN)
		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
	else
D
Dan Rosenberg 已提交
3716
		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3717 3718
			       s,
			       atomic_read(&s->sk_refcnt),
3719 3720
			       sk_rmem_alloc_get(s),
			       sk_wmem_alloc_get(s),
3721
			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
L
Linus Torvalds 已提交
3722 3723
			       sock_i_ino(s)
			       );
3724 3725 3726 3727
	return 0;
}

static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3728
	__acquires(rcu)
3729
{
3730
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3731
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
L
Linus Torvalds 已提交
3732

S
stephen hemminger 已提交
3733 3734
	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3735 3736 3737 3738
}

static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
{
3739
	struct net *net = seq_file_net(f);
A
Alexey Dobriyan 已提交
3740 3741
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

S
stephen hemminger 已提交
3742
	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3743
}
L
Linus Torvalds 已提交
3744

3745
static void pfkey_seq_stop(struct seq_file *f, void *v)
3746
	__releases(rcu)
3747
{
S
stephen hemminger 已提交
3748
	rcu_read_unlock();
3749
}
L
Linus Torvalds 已提交
3750

3751
static const struct seq_operations pfkey_seq_ops = {
3752 3753 3754 3755 3756
	.start	= pfkey_seq_start,
	.next	= pfkey_seq_next,
	.stop	= pfkey_seq_stop,
	.show	= pfkey_seq_show,
};
L
Linus Torvalds 已提交
3757

3758 3759
static int pfkey_seq_open(struct inode *inode, struct file *file)
{
3760 3761
	return seq_open_net(inode, file, &pfkey_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3762
}
3763

3764
static const struct file_operations pfkey_proc_ops = {
3765 3766 3767
	.open	 = pfkey_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
3768
	.release = seq_release_net,
3769 3770
};

3771
static int __net_init pfkey_init_proc(struct net *net)
3772
{
3773 3774
	struct proc_dir_entry *e;

3775
	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3776
	if (e == NULL)
3777
		return -ENOMEM;
3778 3779

	return 0;
3780 3781
}

3782
static void __net_exit pfkey_exit_proc(struct net *net)
3783
{
3784
	remove_proc_entry("pfkey", net->proc_net);
3785 3786
}
#else
3787
static inline int pfkey_init_proc(struct net *net)
3788 3789 3790 3791
{
	return 0;
}

3792
static inline void pfkey_exit_proc(struct net *net)
3793 3794
{
}
L
Linus Torvalds 已提交
3795 3796 3797 3798 3799 3800 3801 3802 3803
#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,
3804
	.notify_policy	= pfkey_send_policy_notify,
3805
	.migrate	= pfkey_send_migrate,
3806
	.is_alive	= pfkey_is_alive,
L
Linus Torvalds 已提交
3807 3808
};

A
Alexey Dobriyan 已提交
3809 3810
static int __net_init pfkey_net_init(struct net *net)
{
3811
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
A
Alexey Dobriyan 已提交
3812 3813 3814 3815
	int rv;

	INIT_HLIST_HEAD(&net_pfkey->table);
	atomic_set(&net_pfkey->socks_nr, 0);
3816

3817
	rv = pfkey_init_proc(net);
A
Alexey Dobriyan 已提交
3818 3819 3820 3821 3822 3823 3824 3825

	return rv;
}

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

3826
	pfkey_exit_proc(net);
A
Alexey Dobriyan 已提交
3827 3828 3829 3830 3831 3832
	BUG_ON(!hlist_empty(&net_pfkey->table));
}

static struct pernet_operations pfkey_net_ops = {
	.init = pfkey_net_init,
	.exit = pfkey_net_exit,
3833 3834
	.id   = &pfkey_net_id,
	.size = sizeof(struct netns_pfkey),
A
Alexey Dobriyan 已提交
3835 3836
};

L
Linus Torvalds 已提交
3837 3838 3839 3840
static void __exit ipsec_pfkey_exit(void)
{
	xfrm_unregister_km(&pfkeyv2_mgr);
	sock_unregister(PF_KEY);
3841
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
	proto_unregister(&key_proto);
}

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

	if (err != 0)
		goto out;

3852
	err = register_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3853 3854
	if (err != 0)
		goto out_unregister_key_proto;
3855 3856 3857
	err = sock_register(&pfkey_family_ops);
	if (err != 0)
		goto out_unregister_pernet;
L
Linus Torvalds 已提交
3858 3859
	err = xfrm_register_km(&pfkeyv2_mgr);
	if (err != 0)
3860
		goto out_sock_unregister;
L
Linus Torvalds 已提交
3861 3862
out:
	return err;
3863

L
Linus Torvalds 已提交
3864 3865
out_sock_unregister:
	sock_unregister(PF_KEY);
3866 3867
out_unregister_pernet:
	unregister_pernet_subsys(&pfkey_net_ops);
L
Linus Torvalds 已提交
3868 3869 3870 3871 3872 3873 3874 3875 3876
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);