af_key.c 97.3 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 <net/net_namespace.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))


/* List of all pfkey sockets. */
static HLIST_HEAD(pfkey_table);
static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
static DEFINE_RWLOCK(pfkey_table_lock);
static atomic_t pfkey_table_users = ATOMIC_INIT(0);

static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);

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;
		uint32_t	msg_pid;
		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(struct sock *sk)
{
	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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	pfkey_terminate_dump(pfkey_sk(sk));
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	skb_queue_purge(&sk->sk_receive_queue);

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

static void pfkey_table_grab(void)
{
	write_lock_bh(&pfkey_table_lock);

	if (atomic_read(&pfkey_table_users)) {
		DECLARE_WAITQUEUE(wait, current);

		add_wait_queue_exclusive(&pfkey_table_wait, &wait);
		for(;;) {
			set_current_state(TASK_UNINTERRUPTIBLE);
			if (atomic_read(&pfkey_table_users) == 0)
				break;
			write_unlock_bh(&pfkey_table_lock);
			schedule();
			write_lock_bh(&pfkey_table_lock);
		}

		__set_current_state(TASK_RUNNING);
		remove_wait_queue(&pfkey_table_wait, &wait);
	}
}

static __inline__ void pfkey_table_ungrab(void)
{
	write_unlock_bh(&pfkey_table_lock);
	wake_up(&pfkey_table_wait);
}

static __inline__ void pfkey_lock_table(void)
{
	/* read_lock() synchronizes us to pfkey_table_grab */

	read_lock(&pfkey_table_lock);
	atomic_inc(&pfkey_table_users);
	read_unlock(&pfkey_table_lock);
}

static __inline__ void pfkey_unlock_table(void)
{
	if (atomic_dec_and_test(&pfkey_table_users))
		wake_up(&pfkey_table_wait);
}


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static const struct proto_ops pfkey_ops;
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static void pfkey_insert(struct sock *sk)
{
	pfkey_table_grab();
	sk_add_node(sk, &pfkey_table);
	pfkey_table_ungrab();
}

static void pfkey_remove(struct sock *sk)
{
	pfkey_table_grab();
	sk_del_node_init(sk);
	pfkey_table_ungrab();
}

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)
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{
	struct sock *sk;
	int err;

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	if (net != &init_net)
		return -EAFNOSUPPORT;

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	if (!capable(CAP_NET_ADMIN))
		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;

	atomic_inc(&pfkey_socks_nr);

	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);
	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_orphan(*skb2);
			skb_set_owner_r(*skb2, sk);
			skb_queue_tail(&sk->sk_receive_queue, *skb2);
			sk->sk_data_ready(sk, (*skb2)->len);
			*skb2 = NULL;
			err = 0;
		}
	}
	sock_put(sk);
	return err;
}

/* Send SKB to all pfkey sockets matching selected criteria.  */
#define BROADCAST_ALL		0
#define BROADCAST_ONE		1
#define BROADCAST_REGISTERED	2
#define BROADCAST_PROMISC_ONLY	4
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static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
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			   int broadcast_flags, struct sock *one_sk)
{
	struct sock *sk;
	struct hlist_node *node;
	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;

	pfkey_lock_table();
	sk_for_each(sk, node, &pfkey_table) {
		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;
	}
	pfkey_unlock_table();

	if (one_sk != NULL)
		err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);

	if (skb2)
		kfree_skb(skb2);
	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,
				&pfk->sk);
		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, struct sadb_msg *orig)
{
	*new = *orig;
}

static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
{
	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));

	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);

	return 0;
}

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

/* Verify sadb_address_{len,prefixlen} against sa_family.  */
static int verify_address_len(void *p)
{
	struct sadb_address *sp = p;
	struct sockaddr *addr = (struct sockaddr *)(sp + 1);
	struct sockaddr_in *sin;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	struct sockaddr_in6 *sin6;
#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;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	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(struct sadb_x_sec_ctx *sec_ctx)
{
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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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}

static inline int verify_sec_ctx_len(void *p)
{
	struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_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;
}

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

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

	if (!uctx)
		return NULL;

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

	return uctx;
}

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static int present_and_same_family(struct sadb_address *src,
				   struct sadb_address *dst)
{
	struct sockaddr *s_addr, *d_addr;

	if (!src || !dst)
		return 0;

	s_addr = (struct sockaddr *)(src + 1);
	d_addr = (struct sockaddr *)(dst + 1);
	if (s_addr->sa_family != d_addr->sa_family)
		return 0;
	if (s_addr->sa_family != AF_INET
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	    && s_addr->sa_family != AF_INET6
#endif
		)
		return 0;

	return 1;
}

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

	len -= sizeof(*hdr);
	p += sizeof(*hdr);
	while (len > 0) {
		struct sadb_ext *ehdr = (struct sadb_ext *) p;
		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] = p;
		}
		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)
{
	return (proto == IPSEC_PROTO_ANY ? 0 : proto);
}

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

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static inline int pfkey_sockaddr_len(sa_family_t family)
{
	switch (family) {
	case AF_INET:
		return sizeof(struct sockaddr_in);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	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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{
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	switch (sa->sa_family) {
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	case AF_INET:
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		xaddr->a4 =
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			((struct sockaddr_in *)sa)->sin_addr.s_addr;
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		return AF_INET;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
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		memcpy(xaddr->a6,
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		       &((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
int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
{
	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
				      xaddr);
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}

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

	sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
	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 */
	addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
	if (addr == NULL)
		return NULL;

	family = ((struct sockaddr *)(addr + 1))->sa_family;
	switch (family) {
	case AF_INET:
		xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
		break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
		xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
		break;
#endif
	default:
		xaddr = NULL;
	}

	if (!xaddr)
		return NULL;

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

#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;
	}
}

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static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
				       struct sockaddr *sa,
				       unsigned short family)
{
	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;
	    }
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
	    {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
		sin6->sin6_family = AF_INET6;
		sin6->sin6_port = port;
		sin6->sin6_flowinfo = 0;
		ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
		sin6->sin6_scope_id = 0;
		return 128;
	    }
#endif
	}
	return 0;
}

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static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
					      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_cmp(&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);
		sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
	}
	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);
		sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
	}
	/* 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);
		sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
	}

	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 */
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	addr = (struct sadb_address*) skb_put(skb,
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					      sizeof(struct sadb_address)+sockaddr_size);
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	addr->sadb_address_len =
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		(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
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	/* "if the ports are non-zero, then the sadb_address_proto field,
	   normally zero, MUST be filled in with the transport
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	   protocol's number." - RFC2367 */
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	addr->sadb_address_proto = 0;
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	addr->sadb_address_reserved = 0;

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

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

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	addr->sadb_address_prefixlen =
		pfkey_sockaddr_fill(&x->id.daddr, 0,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
	if (!addr->sadb_address_prefixlen)
		BUG();
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	if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
			  x->props.family)) {
		addr = (struct sadb_address*) skb_put(skb,
			sizeof(struct sadb_address)+sockaddr_size);
		addr->sadb_address_len =
			(sizeof(struct sadb_address)+sockaddr_size)/
			sizeof(uint64_t);
		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
		addr->sadb_address_proto =
			pfkey_proto_from_xfrm(x->sel.proto);
		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
		addr->sadb_address_reserved = 0;
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		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
				    (struct sockaddr *) (addr + 1),
				    x->props.family);
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	}

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

	/* sa */
	sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
	sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
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	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;
	}

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	/* 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);
	}

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	return skb;
}

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static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
{
	struct sk_buff *skb;

	skb = __pfkey_xfrm_state2msg(x, 1, 3);

	return skb;
}

static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
							  int hsc)
{
	return __pfkey_xfrm_state2msg(x, 0, hsc);
}

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static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
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						void **ext_hdrs)
{
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	struct xfrm_state *x;
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	struct sadb_lifetime *lifetime;
	struct sadb_sa *sa;
	struct sadb_key *key;
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	struct sadb_x_sec_ctx *sec_ctx;
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	uint16_t proto;
	int err;
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	sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
	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.

1104
	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
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	   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);
	key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
	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);

	x = xfrm_state_alloc();
	if (x == NULL)
		return ERR_PTR(-ENOBUFS);

	x->id.proto = proto;
	x->id.spi = sa->sadb_sa_spi;
	x->props.replay_window = sa->sadb_sa_replay;
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
		x->props.flags |= XFRM_STATE_NOECN;
	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
		x->props.flags |= XFRM_STATE_DECAP_DSCP;
1136 1137
	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
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	lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
	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;
	}
	lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
	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;
	}
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167

	sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

		if (!uctx)
			goto out;

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

		if (err)
			goto out;
	}

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	key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
	if (sa->sadb_sa_auth) {
		int keysize = 0;
		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
		if (!a) {
			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);
		}
		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);
			if (!a) {
				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);
			if (!a) {
				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; */

1226
	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
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						    &x->props.saddr);
	if (!x->props.family) {
		err = -EAFNOSUPPORT;
		goto out;
	}
1232
	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
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				  &x->id.daddr);

	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
		struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1237 1238 1239 1240 1241 1242
		int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0) {
			err = -EINVAL;
			goto out;
		}
		x->props.mode = mode;
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		x->props.reqid = sa2->sadb_x_sa2_reqid;
	}

	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
		struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];

		/* 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;
	}

1254
	if (!x->sel.family)
1255 1256
		x->sel.family = x->props.family;

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	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
		struct sadb_x_nat_t_type* n_type;
		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]) {
			struct sadb_x_nat_t_port* n_port =
				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]) {
			struct sadb_x_nat_t_port* n_port =
				ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
			natt->encap_dport = n_port->sadb_x_nat_t_port_port;
		}
	}

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	err = xfrm_init_state(x);
	if (err)
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		goto out;
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	x->km.seq = hdr->sadb_msg_seq;
	return x;

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

static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	return -EOPNOTSUPP;
}

static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	struct sk_buff *resp_skb;
	struct sadb_x_sa2 *sa2;
	struct sadb_address *saddr, *daddr;
	struct sadb_msg *out_hdr;
1305
	struct sadb_spirange *range;
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	struct xfrm_state *x = NULL;
1307
	int mode;
1308 1309
	int err;
	u32 min_spi, max_spi;
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	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) {
1324 1325 1326
		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
		if (mode < 0)
			return -EINVAL;
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		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;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	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) {
		x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
		if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
			xfrm_state_put(x);
			x = NULL;
		}
	}

	if (!x)
		x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);

	if (x == NULL)
		return -ENOENT;

1364 1365
	min_spi = 0x100;
	max_spi = 0x0fffffff;
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1367 1368 1369 1370
	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
	if (range) {
		min_spi = range->sadb_spirange_min;
		max_spi = range->sadb_spirange_max;
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	}
1372 1373

	err = xfrm_alloc_spi(x, min_spi, max_spi);
1374
	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
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	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);

	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);

	return 0;
}

static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	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;

	x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
	if (x == NULL)
		return 0;

	spin_lock_bh(&x->lock);
	if (x->km.state == XFRM_STATE_ACQ) {
		x->km.state = XFRM_STATE_ERROR;
		wake_up(&km_waitq);
	}
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return 0;
}

1421 1422 1423
static inline int event2poltype(int event)
{
	switch (event) {
1424
	case XFRM_MSG_DELPOLICY:
1425
		return SADB_X_SPDDELETE;
1426
	case XFRM_MSG_NEWPOLICY:
1427
		return SADB_X_SPDADD;
1428
	case XFRM_MSG_UPDPOLICY:
1429
		return SADB_X_SPDUPDATE;
1430
	case XFRM_MSG_POLEXPIRE:
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	//	return SADB_X_SPDEXPIRE;
	default:
		printk("pfkey: Unknown policy event %d\n", event);
		break;
	}

	return 0;
}

static inline int event2keytype(int event)
{
	switch (event) {
1443
	case XFRM_MSG_DELSA:
1444
		return SADB_DELETE;
1445
	case XFRM_MSG_NEWSA:
1446
		return SADB_ADD;
1447
	case XFRM_MSG_UPDSA:
1448
		return SADB_UPDATE;
1449
	case XFRM_MSG_EXPIRE:
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
		return SADB_EXPIRE;
	default:
		printk("pfkey: Unknown SA event %d\n", event);
		break;
	}

	return 0;
}

/* ADD/UPD/DEL */
static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

1465
	skb = pfkey_xfrm_state2msg(x);
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482

	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;
	hdr->sadb_msg_pid = c->pid;

	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);

	return 0;
}
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static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	struct xfrm_state *x;
	int err;
1488
	struct km_event c;
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	x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
	if (IS_ERR(x))
		return PTR_ERR(x);

1494
	xfrm_state_hold(x);
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	if (hdr->sadb_msg_type == SADB_ADD)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

J
Joy Latten 已提交
1500
	xfrm_audit_state_add(x, err ? 0 : 1,
1501 1502
			     audit_get_loginuid(current),
			     audit_get_sessionid(current), 0);
J
Joy Latten 已提交
1503

L
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1504 1505
	if (err < 0) {
		x->km.state = XFRM_STATE_DEAD;
1506
		__xfrm_state_put(x);
1507
		goto out;
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1508 1509
	}

1510
	if (hdr->sadb_msg_type == SADB_ADD)
1511
		c.event = XFRM_MSG_NEWSA;
1512
	else
1513
		c.event = XFRM_MSG_UPDSA;
1514 1515 1516
	c.seq = hdr->sadb_msg_seq;
	c.pid = hdr->sadb_msg_pid;
	km_state_notify(x, &c);
1517
out:
1518 1519
	xfrm_state_put(x);
	return err;
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1520 1521 1522 1523 1524
}

static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	struct xfrm_state *x;
1525 1526
	struct km_event c;
	int err;
L
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	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;

	x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
	if (x == NULL)
		return -ESRCH;

C
Catherine Zhang 已提交
1537 1538 1539
	if ((err = security_xfrm_state_delete(x)))
		goto out;

L
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1540
	if (xfrm_state_kern(x)) {
C
Catherine Zhang 已提交
1541 1542
		err = -EPERM;
		goto out;
L
Linus Torvalds 已提交
1543
	}
J
Joy Latten 已提交
1544

1545
	err = xfrm_state_delete(x);
J
Joy Latten 已提交
1546

C
Catherine Zhang 已提交
1547 1548
	if (err < 0)
		goto out;
L
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1549

1550 1551
	c.seq = hdr->sadb_msg_seq;
	c.pid = hdr->sadb_msg_pid;
1552
	c.event = XFRM_MSG_DELSA;
1553
	km_state_notify(x, &c);
C
Catherine Zhang 已提交
1554
out:
J
Joy Latten 已提交
1555
	xfrm_audit_state_delete(x, err ? 0 : 1,
1556 1557
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
1558
	xfrm_state_put(x);
L
Linus Torvalds 已提交
1559

1560
	return err;
L
Linus Torvalds 已提交
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
}

static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	__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;

	x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
	if (x == NULL)
		return -ESRCH;

1579
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1580 1581 1582 1583 1584 1585 1586
	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;
1587
	out_hdr->sadb_msg_type = SADB_GET;
L
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	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;
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);

	return 0;
}

1598
static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
A
Al Viro 已提交
1599
					      gfp_t allocation)
L
Linus Torvalds 已提交
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	int len, auth_len, enc_len, i;

	auth_len = xfrm_count_auth_supported();
	if (auth_len) {
		auth_len *= sizeof(struct sadb_alg);
		auth_len += sizeof(struct sadb_supported);
	}
1610

L
Linus Torvalds 已提交
1611 1612 1613 1614 1615
	enc_len = xfrm_count_enc_supported();
	if (enc_len) {
		enc_len *= sizeof(struct sadb_alg);
		enc_len += sizeof(struct sadb_supported);
	}
1616

L
Linus Torvalds 已提交
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684
	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;
			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;
			if (ealg->available)
				*ap++ = ealg->desc;
		}
	}

out_put_algs:
	return skb;
}

static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	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();
1685

L
Linus Torvalds 已提交
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
	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;
	}

	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);

	return 0;
}

1699 1700 1701 1702 1703 1704 1705 1706 1707
static int key_notify_sa_flush(struct km_event *c)
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;

	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
	if (!skb)
		return -ENOBUFS;
	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1708
	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
J
Jerome Borsboom 已提交
1709
	hdr->sadb_msg_type = SADB_FLUSH;
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
	hdr->sadb_msg_seq = c->seq;
	hdr->sadb_msg_pid = c->pid;
	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));

	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);

	return 0;
}

L
Linus Torvalds 已提交
1721 1722 1723
static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	unsigned proto;
1724
	struct km_event c;
J
Joy Latten 已提交
1725
	struct xfrm_audit audit_info;
1726
	int err;
L
Linus Torvalds 已提交
1727 1728 1729 1730 1731

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

1732
	audit_info.loginuid = audit_get_loginuid(current);
1733
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
1734
	audit_info.secid = 0;
1735 1736 1737
	err = xfrm_state_flush(proto, &audit_info);
	if (err)
		return err;
1738
	c.data.proto = proto;
1739 1740
	c.seq = hdr->sadb_msg_seq;
	c.pid = hdr->sadb_msg_pid;
1741
	c.event = XFRM_MSG_FLUSHSA;
1742
	km_state_notify(NULL, &c);
L
Linus Torvalds 已提交
1743 1744 1745 1746 1747 1748

	return 0;
}

static int dump_sa(struct xfrm_state *x, int count, void *ptr)
{
1749
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
1750 1751 1752
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;

1753 1754 1755
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

1756
	out_skb = pfkey_xfrm_state2msg(x);
L
Linus Torvalds 已提交
1757 1758 1759 1760
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

	out_hdr = (struct sadb_msg *) out_skb->data;
1761
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
1762 1763 1764 1765
	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
1766
	out_hdr->sadb_msg_seq = count + 1;
1767
	out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
H
Herbert Xu 已提交
1768 1769 1770 1771 1772 1773

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
				&pfk->sk);
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
1774 1775 1776
	return 0;
}

1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
static int pfkey_dump_sa(struct pfkey_sock *pfk)
{
	return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
}

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

L
Linus Torvalds 已提交
1787 1788 1789
static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	u8 proto;
1790 1791 1792 1793
	struct pfkey_sock *pfk = pfkey_sk(sk);

	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798

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

1799 1800 1801 1802 1803
	pfk->dump.msg_version = hdr->sadb_msg_version;
	pfk->dump.msg_pid = hdr->sadb_msg_pid;
	pfk->dump.dump = pfkey_dump_sa;
	pfk->dump.done = pfkey_dump_sa_done;
	xfrm_state_walk_init(&pfk->dump.u.state, proto);
1804

1805
	return pfkey_do_dump(pfk);
L
Linus Torvalds 已提交
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
}

static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
		/* XXX we mangle packet... */
		hdr->sadb_msg_errno = 0;
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
	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;
}

static u32 gen_reqid(void)
{
1838
	struct xfrm_policy_walk walk;
L
Linus Torvalds 已提交
1839
	u32 start;
1840
	int rc;
L
Linus Torvalds 已提交
1841 1842 1843 1844 1845 1846 1847
	static u32 reqid = IPSEC_MANUAL_REQID_MAX;

	start = reqid;
	do {
		++reqid;
		if (reqid == 0)
			reqid = IPSEC_MANUAL_REQID_MAX+1;
1848 1849 1850 1851
		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
		rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
		xfrm_policy_walk_done(&walk);
		if (rc != -EEXIST)
L
Linus Torvalds 已提交
1852 1853 1854 1855 1856 1857 1858 1859 1860
			return reqid;
	} while (reqid != start);
	return 0;
}

static int
parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
{
	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1861
	int mode;
L
Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867 1868 1869

	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 */
1870 1871 1872
	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	t->mode = mode;
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
	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;
		if (!t->reqid && !(t->reqid = gen_reqid()))
			return -ENOBUFS;
	}

	/* addresses present only in tunnel mode */
1884
	if (t->mode == XFRM_MODE_TUNNEL) {
1885 1886 1887 1888 1889 1890
		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
1891
			return -EINVAL;
1892 1893 1894 1895 1896 1897

		socklen = pfkey_sockaddr_len(family);
		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
					   &t->id.daddr) != family)
			return -EINVAL;
		t->encap_family = family;
1898 1899 1900
	} else
		t->encap_family = xp->family;

L
Linus Torvalds 已提交
1901
	/* No way to set this via kame pfkey */
1902
	t->allalgs = 1;
L
Linus Torvalds 已提交
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
	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);

	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;
}

1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
{
  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;
}

L
Linus Torvalds 已提交
1935 1936
static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
{
1937
	struct xfrm_tmpl *t;
L
Linus Torvalds 已提交
1938
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1939 1940 1941 1942 1943
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
1944
		socklen += pfkey_sockaddr_len(t->encap_family);
1945
	}
L
Linus Torvalds 已提交
1946 1947 1948

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
1949
		(sizeof(struct sadb_address) * 2) +
L
Linus Torvalds 已提交
1950 1951
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
1952 1953
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
1954
		pfkey_xfrm_policy2sec_ctx_size(xp);
L
Linus Torvalds 已提交
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
}

static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
{
	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;
}

1971
static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
L
Linus Torvalds 已提交
1972 1973 1974 1975 1976
{
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_lifetime *lifetime;
	struct sadb_x_policy *pol;
1977 1978
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
L
Linus Torvalds 已提交
1979 1980 1981
	int i;
	int size;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1982
	int socklen = pfkey_sockaddr_len(xp->family);
L
Linus Torvalds 已提交
1983 1984 1985 1986 1987 1988 1989 1990

	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 */
1991
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
1992
					      sizeof(struct sadb_address)+sockaddr_size);
1993
	addr->sadb_address_len =
L
Linus Torvalds 已提交
1994 1995 1996 1997 1998 1999
		(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;
2000 2001 2002 2003
	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
				 xp->selector.sport,
				 (struct sockaddr *) (addr + 1),
				 xp->family))
L
Linus Torvalds 已提交
2004 2005 2006
		BUG();

	/* dst address */
2007
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
2008 2009 2010 2011 2012 2013
					      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);
2014
	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
L
Linus Torvalds 已提交
2015
	addr->sadb_address_reserved = 0;
2016 2017 2018 2019

	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
			    (struct sockaddr *) (addr + 1),
			    xp->family);
L
Linus Torvalds 已提交
2020 2021

	/* hard time */
2022
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2023 2024 2025 2026 2027 2028 2029 2030 2031
						     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 */
2032
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041
						     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 */
2042
	lifetime = (struct sadb_lifetime *)  skb_put(skb,
L
Linus Torvalds 已提交
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
						     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;
	pol->sadb_x_policy_id = xp->index;
	pol->sadb_x_policy_priority = xp->priority;

	for (i=0; i<xp->xfrm_nr; i++) {
		struct sadb_x_ipsecrequest *rq;
		struct xfrm_tmpl *t = xp->xfrm_vec + i;
		int req_size;
2070
		int mode;
L
Linus Torvalds 已提交
2071 2072

		req_size = sizeof(struct sadb_x_ipsecrequest);
2073 2074 2075 2076
		if (t->mode == XFRM_MODE_TUNNEL) {
			socklen = pfkey_sockaddr_len(t->encap_family);
			req_size += socklen * 2;
		} else {
L
Linus Torvalds 已提交
2077
			size -= 2*socklen;
2078
		}
L
Linus Torvalds 已提交
2079 2080 2081 2082 2083
		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;
2084 2085
		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
			return -EINVAL;
2086
		rq->sadb_x_ipsecrequest_mode = mode;
L
Linus Torvalds 已提交
2087 2088 2089 2090 2091 2092
		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;
2093

2094
		if (t->mode == XFRM_MODE_TUNNEL) {
2095 2096 2097 2098 2099 2100 2101
			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
2102 2103
		}
	}
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118

	/* 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
2119 2120
	hdr->sadb_msg_len = size / sizeof(uint64_t);
	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2121 2122

	return 0;
L
Linus Torvalds 已提交
2123 2124
}

2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135
static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	int err;

	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err = PTR_ERR(out_skb);
		goto out;
	}
2136 2137 2138
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
2139 2140 2141 2142

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

2143
	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
		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;
	out_hdr->sadb_msg_pid = c->pid;
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
out:
	return 0;

}

L
Linus Torvalds 已提交
2156 2157
static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
2158
	int err = 0;
L
Linus Torvalds 已提交
2159 2160 2161 2162
	struct sadb_lifetime *lifetime;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2163
	struct km_event c;
2164
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184

	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;

	xp = xfrm_policy_alloc(GFP_KERNEL);
	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;

2185
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
L
Linus Torvalds 已提交
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
	xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
	if (!xp->family) {
		err = -EINVAL;
		goto out;
	}
	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)
2196
		xp->selector.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2197

2198
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
L
Linus Torvalds 已提交
2199 2200 2201 2202 2203 2204 2205 2206 2207 2208
	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)
2209
		xp->selector.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2210

2211 2212 2213 2214 2215 2216 2217 2218 2219
	sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

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

2220
		err = security_xfrm_policy_alloc(&xp->security, uctx);
2221 2222 2223 2224 2225 2226
		kfree(uctx);

		if (err)
			goto out;
	}

L
Linus Torvalds 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249
	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);
2250

J
Joy Latten 已提交
2251
	xfrm_audit_policy_add(xp, err ? 0 : 1,
2252 2253
			      audit_get_loginuid(current),
			      audit_get_sessionid(current), 0);
J
Joy Latten 已提交
2254

2255 2256
	if (err)
		goto out;
L
Linus Torvalds 已提交
2257

2258
	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2259
		c.event = XFRM_MSG_UPDPOLICY;
2260
	else
2261
		c.event = XFRM_MSG_NEWPOLICY;
L
Linus Torvalds 已提交
2262

2263 2264
	c.seq = hdr->sadb_msg_seq;
	c.pid = hdr->sadb_msg_pid;
L
Linus Torvalds 已提交
2265

2266 2267
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
2268 2269 2270
	return 0;

out:
H
Herbert Xu 已提交
2271
	xp->walk.dead = 1;
2272
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
2273 2274 2275 2276 2277 2278 2279 2280
	return err;
}

static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	int err;
	struct sadb_address *sa;
	struct sadb_x_policy *pol;
2281
	struct xfrm_policy *xp;
L
Linus Torvalds 已提交
2282
	struct xfrm_selector sel;
2283
	struct km_event c;
2284
	struct sadb_x_sec_ctx *sec_ctx;
2285
	struct xfrm_sec_ctx *pol_ctx = NULL;
L
Linus Torvalds 已提交
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

	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));

2298
	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
L
Linus Torvalds 已提交
2299 2300 2301 2302 2303
	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)
2304
		sel.sport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2305

2306
	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
L
Linus Torvalds 已提交
2307 2308 2309 2310 2311
	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)
2312
		sel.dport_mask = htons(0xffff);
L
Linus Torvalds 已提交
2313

2314 2315 2316 2317 2318 2319 2320
	sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
	if (sec_ctx != NULL) {
		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);

		if (!uctx)
			return -ENOMEM;

2321
		err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2322 2323 2324
		kfree(uctx);
		if (err)
			return err;
2325
	}
J
Joy Latten 已提交
2326

2327 2328 2329 2330
	xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN,
				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
				   1, &err);
	security_xfrm_policy_free(pol_ctx);
L
Linus Torvalds 已提交
2331 2332 2333
	if (xp == NULL)
		return -ENOENT;

J
Joy Latten 已提交
2334
	xfrm_audit_policy_delete(xp, err ? 0 : 1,
2335 2336
				 audit_get_loginuid(current),
				 audit_get_sessionid(current), 0);
2337 2338

	if (err)
C
Catherine Zhang 已提交
2339
		goto out;
2340

2341 2342
	c.seq = hdr->sadb_msg_seq;
	c.pid = hdr->sadb_msg_pid;
2343
	c.data.byid = 0;
2344
	c.event = XFRM_MSG_DELPOLICY;
2345 2346
	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);

C
Catherine Zhang 已提交
2347
out:
2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358
	xfrm_pol_put(xp);
	return err;
}

static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
{
	int err;
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
	err = 0;

L
Linus Torvalds 已提交
2359 2360 2361 2362 2363
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb)) {
		err =  PTR_ERR(out_skb);
		goto out;
	}
2364 2365 2366
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		goto out;
L
Linus Torvalds 已提交
2367 2368 2369

	out_hdr = (struct sadb_msg *) out_skb->data;
	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2370
	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
L
Linus Torvalds 已提交
2371 2372 2373 2374
	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;
2375
	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
L
Linus Torvalds 已提交
2376 2377 2378 2379 2380 2381
	err = 0;

out:
	return err;
}

2382 2383 2384
#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_sockaddr_pair_size(sa_family_t family)
{
2385
	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2386 2387
}

2388
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2389 2390 2391
			       xfrm_address_t *saddr, xfrm_address_t *daddr,
			       u16 *family)
{
2392 2393
	int af, socklen;

2394
	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2395 2396
		return -EINVAL;

2397
	af = pfkey_sockaddr_extract(sa, saddr);
2398 2399 2400 2401
	if (!af)
		return -EINVAL;

	socklen = pfkey_sockaddr_len(af);
2402
	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2403
				   daddr) != af)
2404 2405
		return -EINVAL;

2406
	*family = af;
2407 2408 2409 2410 2411 2412 2413 2414
	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;
2415
	int mode;
2416 2417 2418 2419 2420 2421

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

	/* old endoints */
2422 2423 2424
	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
				  rq1->sadb_x_ipsecrequest_len,
				  &m->old_saddr, &m->old_daddr,
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
				  &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 */
2437 2438 2439
	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
				  rq2->sadb_x_ipsecrequest_len,
				  &m->new_saddr, &m->new_daddr,
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449
				  &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;
2450 2451 2452
	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
		return -EINVAL;
	m->mode = mode;
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
	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,
			 struct sadb_msg *hdr, void **ext_hdrs)
{
	int i, len, ret, err = -EINVAL;
	u8 dir;
	struct sadb_address *sa;
2465
	struct sadb_x_kmaddress *kma;
2466 2467 2468 2469
	struct sadb_x_policy *pol;
	struct sadb_x_ipsecrequest *rq;
	struct xfrm_selector sel;
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2470
	struct xfrm_kmaddress k;
2471 2472

	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2473
				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2474 2475 2476 2477 2478
	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
		err = -EINVAL;
		goto out;
	}

2479
	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2480 2481 2482 2483 2484 2485 2486
	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];

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

2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
	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;
		}
	}

2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
	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
2509
		sel.sport_mask = htons(0xffff);
2510 2511 2512 2513 2514 2515 2516 2517

	/* 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
2518
		sel.dport_mask = htons(0xffff);
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542

	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;
	}

2543 2544
	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
			    kma ? &k : NULL);
2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557

 out:
	return err;
}
#else
static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
			 struct sadb_msg *hdr, void **ext_hdrs)
{
	return -ENOPROTOOPT;
}
#endif


L
Linus Torvalds 已提交
2558 2559
static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
2560
	unsigned int dir;
2561
	int err = 0, delete;
L
Linus Torvalds 已提交
2562 2563
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
2564
	struct km_event c;
L
Linus Torvalds 已提交
2565 2566 2567 2568

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

2569 2570 2571 2572
	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

2573
	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2574
	xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2575
			      delete, &err);
L
Linus Torvalds 已提交
2576 2577 2578
	if (xp == NULL)
		return -ENOENT;

2579
	if (delete) {
J
Joy Latten 已提交
2580
		xfrm_audit_policy_delete(xp, err ? 0 : 1,
2581 2582
				audit_get_loginuid(current),
				audit_get_sessionid(current), 0);
L
Linus Torvalds 已提交
2583

2584 2585 2586 2587
		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
		c.pid = hdr->sadb_msg_pid;
2588
		c.data.byid = 1;
2589
		c.event = XFRM_MSG_DELPOLICY;
2590
		km_policy_notify(xp, dir, &c);
2591
	} else {
2592
		err = key_pol_get_resp(sk, xp, hdr, dir);
L
Linus Torvalds 已提交
2593 2594
	}

2595
out:
L
Linus Torvalds 已提交
2596 2597 2598 2599 2600 2601
	xfrm_pol_put(xp);
	return err;
}

static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
2602
	struct pfkey_sock *pfk = ptr;
L
Linus Torvalds 已提交
2603 2604
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2605
	int err;
L
Linus Torvalds 已提交
2606

2607 2608 2609
	if (!pfkey_can_dump(&pfk->sk))
		return -ENOBUFS;

L
Linus Torvalds 已提交
2610 2611 2612 2613
	out_skb = pfkey_xfrm_policy2msg_prep(xp);
	if (IS_ERR(out_skb))
		return PTR_ERR(out_skb);

2614 2615 2616
	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2617 2618

	out_hdr = (struct sadb_msg *) out_skb->data;
2619
	out_hdr->sadb_msg_version = pfk->dump.msg_version;
L
Linus Torvalds 已提交
2620 2621 2622
	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
2623
	out_hdr->sadb_msg_seq = count + 1;
2624
	out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
H
Herbert Xu 已提交
2625 2626 2627 2628 2629 2630

	if (pfk->dump.skb)
		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
				&pfk->sk);
	pfk->dump.skb = out_skb;

L
Linus Torvalds 已提交
2631 2632 2633
	return 0;
}

2634 2635 2636 2637 2638 2639 2640 2641 2642 2643
static int pfkey_dump_sp(struct pfkey_sock *pfk)
{
	return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
}

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

L
Linus Torvalds 已提交
2644 2645
static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
2646
	struct pfkey_sock *pfk = pfkey_sk(sk);
2647

2648 2649
	if (pfk->dump.dump != NULL)
		return -EBUSY;
L
Linus Torvalds 已提交
2650

2651 2652 2653 2654 2655 2656 2657
	pfk->dump.msg_version = hdr->sadb_msg_version;
	pfk->dump.msg_pid = hdr->sadb_msg_pid;
	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
2658 2659
}

2660
static int key_notify_policy_flush(struct km_event *c)
L
Linus Torvalds 已提交
2661 2662
{
	struct sk_buff *skb_out;
2663
	struct sadb_msg *hdr;
L
Linus Torvalds 已提交
2664

2665
	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
L
Linus Torvalds 已提交
2666 2667
	if (!skb_out)
		return -ENOBUFS;
2668
	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
J
Jerome Borsboom 已提交
2669
	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2670 2671 2672 2673 2674 2675 2676
	hdr->sadb_msg_seq = c->seq;
	hdr->sadb_msg_pid = c->pid;
	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));
	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
	return 0;
L
Linus Torvalds 已提交
2677

2678 2679 2680 2681 2682
}

static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
	struct km_event c;
J
Joy Latten 已提交
2683
	struct xfrm_audit audit_info;
2684
	int err;
L
Linus Torvalds 已提交
2685

2686
	audit_info.loginuid = audit_get_loginuid(current);
2687
	audit_info.sessionid = audit_get_sessionid(current);
J
Joy Latten 已提交
2688
	audit_info.secid = 0;
2689 2690 2691
	err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
	if (err)
		return err;
2692
	c.data.type = XFRM_POLICY_TYPE_MAIN;
2693
	c.event = XFRM_MSG_FLUSHPOLICY;
2694 2695 2696
	c.pid = hdr->sadb_msg_pid;
	c.seq = hdr->sadb_msg_seq;
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725

	return 0;
}

typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
			     struct sadb_msg *hdr, void **ext_hdrs);
static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
	[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,
2726
	[SADB_X_MIGRATE]	= pfkey_migrate,
L
Linus Torvalds 已提交
2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775
};

static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
{
	void *ext_hdrs[SADB_EXT_MAX];
	int err;

	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
			BROADCAST_PROMISC_ONLY, NULL);

	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;
}

static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
{
2776 2777 2778 2779 2780 2781
	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
2782 2783 2784 2785
}

static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
{
2786 2787 2788 2789 2790 2791
	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
2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
}

static int count_ah_combs(struct xfrm_tmpl *t)
{
	int i, sz = 0;

	for (i = 0; ; i++) {
		struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
		if (!aalg)
			break;
		if (aalg_tmpl_set(t, aalg) && aalg->available)
			sz += sizeof(struct sadb_comb);
	}
	return sz + sizeof(struct sadb_prop);
}

static int count_esp_combs(struct xfrm_tmpl *t)
{
	int i, k, sz = 0;

	for (i = 0; ; i++) {
		struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
		if (!ealg)
			break;
2816

L
Linus Torvalds 已提交
2817 2818
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2819

L
Linus Torvalds 已提交
2820 2821 2822 2823
		for (k = 1; ; k++) {
			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
			if (!aalg)
				break;
2824

L
Linus Torvalds 已提交
2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
			if (aalg_tmpl_set(t, aalg) && aalg->available)
				sz += sizeof(struct sadb_comb);
		}
	}
	return sz + sizeof(struct sadb_prop);
}

static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
{
	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++) {
		struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
		if (!aalg)
			break;

		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;
		}
	}
}

static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
{
	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++) {
		struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
		if (!ealg)
			break;
2879

L
Linus Torvalds 已提交
2880 2881
		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
			continue;
2882

L
Linus Torvalds 已提交
2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906
		for (k = 1; ; k++) {
			struct sadb_comb *c;
			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
			if (!aalg)
				break;
			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;
		}
	}
}

2907 2908 2909 2910 2911 2912
static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
{
	return 0;
}

static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
L
Linus Torvalds 已提交
2913 2914 2915
{
	struct sk_buff *out_skb;
	struct sadb_msg *out_hdr;
2916 2917 2918
	int hard;
	int hsc;

2919
	hard = c->data.hard;
2920 2921 2922 2923
	if (hard)
		hsc = 2;
	else
		hsc = 1;
L
Linus Torvalds 已提交
2924

2925
	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
L
Linus Torvalds 已提交
2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
	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;

	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
	return 0;
}

2942 2943
static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
{
2944 2945 2946
	if (atomic_read(&pfkey_socks_nr) == 0)
		return 0;

2947
	switch (c->event) {
2948
	case XFRM_MSG_EXPIRE:
2949
		return key_notify_sa_expire(x, c);
2950 2951 2952
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
2953
		return key_notify_sa(x, c);
2954
	case XFRM_MSG_FLUSHSA:
2955
		return key_notify_sa_flush(c);
J
Jamal Hadi Salim 已提交
2956 2957
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
	default:
		printk("pfkey: Unknown SA event %d\n", c->event);
		break;
	}

	return 0;
}

static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{
2968 2969 2970
	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
		return 0;

2971
	switch (c->event) {
2972
	case XFRM_MSG_POLEXPIRE:
2973
		return key_notify_policy_expire(xp, c);
2974 2975 2976
	case XFRM_MSG_DELPOLICY:
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
2977
		return key_notify_policy(xp, dir, c);
2978
	case XFRM_MSG_FLUSHPOLICY:
2979 2980
		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
			break;
2981 2982 2983 2984 2985 2986 2987 2988 2989
		return key_notify_policy_flush(c);
	default:
		printk("pfkey: Unknown policy event %d\n", c->event);
		break;
	}

	return 0;
}

L
Linus Torvalds 已提交
2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009
static u32 get_acqseq(void)
{
	u32 res;
	static u32 acqseq;
	static DEFINE_SPINLOCK(acqseq_lock);

	spin_lock_bh(&acqseq_lock);
	res = (++acqseq ? : ++acqseq);
	spin_unlock_bh(&acqseq_lock);
	return res;
}

static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
{
	struct sk_buff *skb;
	struct sadb_msg *hdr;
	struct sadb_address *addr;
	struct sadb_x_policy *pol;
	int sockaddr_size;
	int size;
3010 3011 3012
	struct sadb_x_sec_ctx *sec_ctx;
	struct xfrm_sec_ctx *xfrm_ctx;
	int ctx_size = 0;
3013

L
Linus Torvalds 已提交
3014 3015 3016 3017 3018 3019 3020 3021
	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);
3022

L
Linus Torvalds 已提交
3023 3024 3025 3026 3027
	if (x->id.proto == IPPROTO_AH)
		size += count_ah_combs(t);
	else if (x->id.proto == IPPROTO_ESP)
		size += count_esp_combs(t);

3028 3029 3030 3031 3032
	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
3033 3034 3035
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3036

L
Linus Torvalds 已提交
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047
	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 */
3048
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3049
					      sizeof(struct sadb_address)+sockaddr_size);
3050
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3051 3052 3053 3054 3055
		(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;
3056 3057 3058 3059 3060
	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
3061
		BUG();
3062

L
Linus Torvalds 已提交
3063
	/* dst address */
3064
	addr = (struct sadb_address*) skb_put(skb,
L
Linus Torvalds 已提交
3065 3066 3067 3068 3069 3070 3071
					      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;
3072 3073 3074 3075 3076
	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
3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
		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;
	pol->sadb_x_policy_dir = dir+1;
	pol->sadb_x_policy_id = xp->index;

	/* 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);

3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
	/* 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
3106 3107 3108
	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
}

3109
static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3110
						u8 *data, int len, int *dir)
L
Linus Torvalds 已提交
3111 3112 3113
{
	struct xfrm_policy *xp;
	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3114
	struct sadb_x_sec_ctx *sec_ctx;
L
Linus Torvalds 已提交
3115

3116
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156
	case AF_INET:
		if (opt != IP_IPSEC_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	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;

	xp = xfrm_policy_alloc(GFP_ATOMIC);
	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;
3157
	xp->family = sk->sk_family;
L
Linus Torvalds 已提交
3158 3159 3160 3161 3162 3163

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

3164 3165 3166 3167 3168 3169 3170 3171 3172
	/* 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 +
3173 3174
		    sec_ctx->sadb_x_sec_len) {
			*dir = -EINVAL;
3175
			goto out;
3176
		}
3177 3178 3179
		if ((*dir = verify_sec_ctx_len(p)))
			goto out;
		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3180
		*dir = security_xfrm_policy_alloc(&xp->security, uctx);
3181 3182 3183 3184 3185 3186
		kfree(uctx);

		if (*dir)
			goto out;
	}

L
Linus Torvalds 已提交
3187 3188 3189 3190
	*dir = pol->sadb_x_policy_dir-1;
	return xp;

out:
3191
	xp->walk.dead = 1;
3192
	xfrm_policy_destroy(xp);
L
Linus Torvalds 已提交
3193 3194 3195
	return NULL;
}

A
Al Viro 已提交
3196
static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
L
Linus Torvalds 已提交
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
{
	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)
	 */
3225

L
Linus Torvalds 已提交
3226 3227 3228 3229 3230
	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);
3231

L
Linus Torvalds 已提交
3232 3233 3234
	skb =  alloc_skb(size + 16, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
3235

L
Linus Torvalds 已提交
3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259
	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);
3260
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3261 3262 3263 3264 3265
		(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;
3266 3267 3268 3269 3270
	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
3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282
		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);
3283
	addr->sadb_address_len =
L
Linus Torvalds 已提交
3284 3285 3286 3287 3288
		(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;
3289 3290 3291 3292 3293
	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
3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305
		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;

	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
}

3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318
#ifdef CONFIG_NET_KEY_MIGRATE
static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
			    struct xfrm_selector *sel)
{
	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:
3319 3320 3321 3322
		addr->sadb_address_prefixlen = sel->prefixlen_s;
		pfkey_sockaddr_fill(&sel->saddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3323 3324
		break;
	case SADB_EXT_ADDRESS_DST:
3325 3326 3327 3328
		addr->sadb_address_prefixlen = sel->prefixlen_d;
		pfkey_sockaddr_fill(&sel->daddr, 0,
				    (struct sockaddr *)(addr + 1),
				    sel->family);
3329 3330 3331 3332 3333 3334 3335 3336
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362

static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
{
	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;
}

3363 3364 3365 3366 3367 3368
static int set_ipsecrequest(struct sk_buff *skb,
			    uint8_t proto, uint8_t mode, int level,
			    uint32_t reqid, uint8_t family,
			    xfrm_address_t *src, xfrm_address_t *dst)
{
	struct sadb_x_ipsecrequest *rq;
3369 3370
	u8 *sa;
	int socklen = pfkey_sockaddr_len(family);
3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383
	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;

3384 3385 3386
	sa = (u8 *) (rq + 1);
	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3387 3388 3389 3390 3391 3392 3393 3394
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_NET_KEY_MIGRATE
static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3395 3396
			      struct xfrm_migrate *m, int num_bundles,
			      struct xfrm_kmaddress *k)
3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412
{
	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;
	struct xfrm_migrate *mp;

	if (type != XFRM_POLICY_TYPE_MAIN)
		return 0;

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

3413 3414 3415 3416 3417 3418
	if (k != NULL) {
		/* addresses for KM */
		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
				     pfkey_sockaddr_pair_size(k->family));
	}

3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454
	/* 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;

3455 3456 3457 3458
	/* Addresses to be used by KM for negotiation, if ext is available */
	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
		return -EINVAL;

3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475
	/* 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;
	pol->sadb_x_policy_id = 0;
	pol->sadb_x_policy_priority = 0;

	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
		/* old ipsecrequest */
3476 3477
		int mode = pfkey_mode_from_xfrm(mp->mode);
		if (mode < 0)
3478
			goto err;
3479
		if (set_ipsecrequest(skb, mp->proto, mode,
3480 3481
				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->old_family,
3482 3483
				     &mp->old_saddr, &mp->old_daddr) < 0)
			goto err;
3484 3485

		/* new ipsecrequest */
3486
		if (set_ipsecrequest(skb, mp->proto, mode,
3487 3488
				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
				     mp->reqid, mp->new_family,
3489 3490
				     &mp->new_saddr, &mp->new_daddr) < 0)
			goto err;
3491 3492 3493 3494 3495 3496
	}

	/* broadcast migrate message to sockets */
	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);

	return 0;
3497 3498 3499 3500

err:
	kfree_skb(skb);
	return -EINVAL;
3501 3502 3503
}
#else
static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3504 3505
			      struct xfrm_migrate *m, int num_bundles,
			      struct xfrm_kmaddress *k)
3506 3507 3508 3509 3510
{
	return -ENOPROTOOPT;
}
#endif

L
Linus Torvalds 已提交
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 3537 3538 3539
static int pfkey_sendmsg(struct kiocb *kiocb,
			 struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb = NULL;
	struct sadb_msg *hdr = NULL;
	int err;

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

	err = -EMSGSIZE;
	if ((unsigned)len > sk->sk_sndbuf - 32)
		goto out;

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

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

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

A
Arjan van de Ven 已提交
3540
	mutex_lock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3541
	err = pfkey_process(sk, skb, hdr);
A
Arjan van de Ven 已提交
3542
	mutex_unlock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557

out:
	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
		err = 0;
	if (skb)
		kfree_skb(skb);

	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;
3558
	struct pfkey_sock *pfk = pfkey_sk(sk);
L
Linus Torvalds 已提交
3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
	struct sk_buff *skb;
	int copied, err;

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

	msg->msg_namelen = 0;
	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
	if (skb == NULL)
		goto out;

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

3577
	skb_reset_transport_header(skb);
L
Linus Torvalds 已提交
3578 3579 3580 3581 3582 3583 3584 3585
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free;

	sock_recv_timestamp(msg, sk, skb);

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

3586 3587 3588 3589
	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
3590 3591 3592 3593 3594 3595
out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

3596
static const struct proto_ops pfkey_ops = {
L
Linus Torvalds 已提交
3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
	.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,
};

static struct net_proto_family pfkey_family_ops = {
	.family	=	PF_KEY,
	.create	=	pfkey_create,
	.owner	=	THIS_MODULE,
};

#ifdef CONFIG_PROC_FS
3627
static int pfkey_seq_show(struct seq_file *f, void *v)
L
Linus Torvalds 已提交
3628 3629 3630
{
	struct sock *s;

3631 3632 3633 3634 3635
	s = (struct sock *)v;
	if (v == SEQ_START_TOKEN)
		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
	else
		seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3636 3637 3638 3639 3640 3641 3642
			       s,
			       atomic_read(&s->sk_refcnt),
			       atomic_read(&s->sk_rmem_alloc),
			       atomic_read(&s->sk_wmem_alloc),
			       sock_i_uid(s),
			       sock_i_ino(s)
			       );
3643 3644 3645 3646 3647 3648 3649 3650
	return 0;
}

static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
{
	struct sock *s;
	struct hlist_node *node;
	loff_t pos = *ppos;
L
Linus Torvalds 已提交
3651

3652 3653 3654
	read_lock(&pfkey_table_lock);
	if (pos == 0)
		return SEQ_START_TOKEN;
3655

3656 3657 3658
	sk_for_each(s, node, &pfkey_table)
		if (pos-- == 1)
			return s;
L
Linus Torvalds 已提交
3659

3660 3661 3662 3663 3664 3665 3666 3667 3668 3669
	return NULL;
}

static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
{
	++*ppos;
	return (v == SEQ_START_TOKEN) ?
		sk_head(&pfkey_table) :
			sk_next((struct sock *)v);
}
L
Linus Torvalds 已提交
3670

3671 3672 3673 3674
static void pfkey_seq_stop(struct seq_file *f, void *v)
{
	read_unlock(&pfkey_table_lock);
}
L
Linus Torvalds 已提交
3675

3676 3677 3678 3679 3680 3681
static struct seq_operations pfkey_seq_ops = {
	.start	= pfkey_seq_start,
	.next	= pfkey_seq_next,
	.stop	= pfkey_seq_stop,
	.show	= pfkey_seq_show,
};
L
Linus Torvalds 已提交
3682

3683 3684 3685
static int pfkey_seq_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &pfkey_seq_ops);
L
Linus Torvalds 已提交
3686
}
3687

3688 3689 3690 3691 3692 3693 3694
static struct file_operations pfkey_proc_ops = {
	.open	 = pfkey_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = seq_release,
};

3695 3696
static int pfkey_init_proc(void)
{
3697 3698
	struct proc_dir_entry *e;

3699
	e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3700
	if (e == NULL)
3701
		return -ENOMEM;
3702 3703

	return 0;
3704 3705 3706 3707
}

static void pfkey_exit_proc(void)
{
3708
	proc_net_remove(&init_net, "pfkey");
3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
}
#else
static inline int pfkey_init_proc(void)
{
	return 0;
}

static inline void pfkey_exit_proc(void)
{
}
L
Linus Torvalds 已提交
3719 3720 3721 3722 3723 3724 3725 3726 3727
#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,
3728
	.notify_policy	= pfkey_send_policy_notify,
3729
	.migrate	= pfkey_send_migrate,
L
Linus Torvalds 已提交
3730 3731 3732 3733 3734
};

static void __exit ipsec_pfkey_exit(void)
{
	xfrm_unregister_km(&pfkeyv2_mgr);
3735
	pfkey_exit_proc();
L
Linus Torvalds 已提交
3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749
	sock_unregister(PF_KEY);
	proto_unregister(&key_proto);
}

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

	if (err != 0)
		goto out;

	err = sock_register(&pfkey_family_ops);
	if (err != 0)
		goto out_unregister_key_proto;
3750 3751
	err = pfkey_init_proc();
	if (err != 0)
L
Linus Torvalds 已提交
3752 3753 3754 3755 3756 3757 3758
		goto out_sock_unregister;
	err = xfrm_register_km(&pfkeyv2_mgr);
	if (err != 0)
		goto out_remove_proc_entry;
out:
	return err;
out_remove_proc_entry:
3759
	pfkey_exit_proc();
L
Linus Torvalds 已提交
3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770
out_sock_unregister:
	sock_unregister(PF_KEY);
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);