2005-04-16 15:20:36 -07:00
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/*
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* xfrm_input.c
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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2007-02-09 07:25:29 -07:00
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*
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2005-04-16 15:20:36 -07:00
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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2007-11-13 22:44:23 -07:00
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#include <linux/netdevice.h>
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#include <net/dst.h>
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2005-04-16 15:20:36 -07:00
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#include <net/ip.h>
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#include <net/xfrm.h>
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2006-12-06 21:33:20 -07:00
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static struct kmem_cache *secpath_cachep __read_mostly;
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2005-04-16 15:20:36 -07:00
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void __secpath_destroy(struct sec_path *sp)
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{
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int i;
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for (i = 0; i < sp->len; i++)
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2006-04-01 01:54:16 -07:00
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xfrm_state_put(sp->xvec[i]);
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2005-04-16 15:20:36 -07:00
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kmem_cache_free(secpath_cachep, sp);
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}
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EXPORT_SYMBOL(__secpath_destroy);
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struct sec_path *secpath_dup(struct sec_path *src)
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{
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struct sec_path *sp;
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2006-12-06 21:33:16 -07:00
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sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
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2005-04-16 15:20:36 -07:00
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if (!sp)
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return NULL;
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sp->len = 0;
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if (src) {
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int i;
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memcpy(sp, src, sizeof(*sp));
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for (i = 0; i < sp->len; i++)
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2006-04-01 01:54:16 -07:00
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xfrm_state_hold(sp->xvec[i]);
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2005-04-16 15:20:36 -07:00
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}
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atomic_set(&sp->refcnt, 1);
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return sp;
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}
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EXPORT_SYMBOL(secpath_dup);
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/* Fetch spi and seq from ipsec header */
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2006-09-27 18:47:59 -07:00
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int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
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2005-04-16 15:20:36 -07:00
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{
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int offset, offset_seq;
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2007-10-17 21:30:34 -07:00
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int hlen;
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2005-04-16 15:20:36 -07:00
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switch (nexthdr) {
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case IPPROTO_AH:
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2007-10-17 21:30:34 -07:00
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hlen = sizeof(struct ip_auth_hdr);
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2005-04-16 15:20:36 -07:00
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offset = offsetof(struct ip_auth_hdr, spi);
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offset_seq = offsetof(struct ip_auth_hdr, seq_no);
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break;
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case IPPROTO_ESP:
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2007-10-17 21:30:34 -07:00
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hlen = sizeof(struct ip_esp_hdr);
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2005-04-16 15:20:36 -07:00
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offset = offsetof(struct ip_esp_hdr, spi);
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offset_seq = offsetof(struct ip_esp_hdr, seq_no);
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break;
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case IPPROTO_COMP:
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if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
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return -EINVAL;
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2007-04-25 18:04:18 -07:00
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*spi = htonl(ntohs(*(__be16*)(skb_transport_header(skb) + 2)));
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2005-04-16 15:20:36 -07:00
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*seq = 0;
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return 0;
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default:
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return 1;
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}
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2007-10-17 21:30:34 -07:00
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if (!pskb_may_pull(skb, hlen))
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2005-04-16 15:20:36 -07:00
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return -EINVAL;
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2007-04-25 18:04:18 -07:00
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*spi = *(__be32*)(skb_transport_header(skb) + offset);
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*seq = *(__be32*)(skb_transport_header(skb) + offset_seq);
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2005-04-16 15:20:36 -07:00
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return 0;
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}
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EXPORT_SYMBOL(xfrm_parse_spi);
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2007-11-13 22:41:28 -07:00
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int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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err = x->outer_mode->afinfo->extract_input(x, skb);
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if (err)
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return err;
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skb->protocol = x->inner_mode->afinfo->eth_proto;
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return x->inner_mode->input2(x, skb);
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}
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EXPORT_SYMBOL(xfrm_prepare_input);
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2007-11-13 22:44:23 -07:00
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int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
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{
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int err;
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__be32 seq;
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struct xfrm_state *x;
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2007-11-19 19:50:17 -07:00
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xfrm_address_t *daddr;
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2007-12-03 23:54:12 -07:00
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unsigned int family;
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2007-11-13 22:44:23 -07:00
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int decaps = 0;
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2007-11-19 19:50:17 -07:00
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int async = 0;
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/* A negative encap_type indicates async resumption. */
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if (encap_type < 0) {
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async = 1;
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x = skb->sp->xvec[skb->sp->len - 1];
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seq = XFRM_SKB_CB(skb)->seq;
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goto resume;
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}
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2007-11-13 22:44:23 -07:00
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2007-11-13 22:44:55 -07:00
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
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struct sec_path *sp;
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sp = secpath_dup(skb->sp);
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if (!sp)
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goto drop;
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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2007-11-19 19:50:17 -07:00
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daddr = (xfrm_address_t *)(skb_network_header(skb) +
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XFRM_SPI_SKB_CB(skb)->daddroff);
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2007-12-03 23:54:12 -07:00
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family = XFRM_SPI_SKB_CB(skb)->family;
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2007-11-19 19:50:17 -07:00
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2007-11-13 22:44:23 -07:00
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seq = 0;
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if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
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goto drop;
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do {
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2007-11-13 22:44:55 -07:00
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if (skb->sp->len == XFRM_MAX_DEPTH)
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2007-11-13 22:44:23 -07:00
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goto drop;
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2007-12-03 23:54:12 -07:00
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x = xfrm_state_lookup(daddr, spi, nexthdr, family);
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2007-11-13 22:44:23 -07:00
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if (x == NULL)
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goto drop;
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2007-11-13 22:44:55 -07:00
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skb->sp->xvec[skb->sp->len++] = x;
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2007-11-13 22:44:23 -07:00
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spin_lock(&x->lock);
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if (unlikely(x->km.state != XFRM_STATE_VALID))
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goto drop_unlock;
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if ((x->encap ? x->encap->encap_type : 0) != encap_type)
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goto drop_unlock;
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if (x->props.replay_window && xfrm_replay_check(x, seq))
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goto drop_unlock;
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if (xfrm_state_check_expire(x))
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goto drop_unlock;
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2007-11-13 22:45:58 -07:00
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spin_unlock(&x->lock);
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2007-11-19 19:50:17 -07:00
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XFRM_SKB_CB(skb)->seq = seq;
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2007-11-13 22:44:23 -07:00
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nexthdr = x->type->input(x, skb);
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2007-11-13 22:45:58 -07:00
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2007-11-19 19:50:17 -07:00
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if (nexthdr == -EINPROGRESS)
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return 0;
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resume:
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2007-11-13 22:45:58 -07:00
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spin_lock(&x->lock);
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2007-12-16 16:55:02 -07:00
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if (nexthdr <= 0) {
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if (nexthdr == -EBADMSG)
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x->stats.integrity_failed++;
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2007-11-13 22:44:23 -07:00
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goto drop_unlock;
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2007-12-16 16:55:02 -07:00
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}
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2007-11-13 22:44:23 -07:00
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/* only the first xfrm gets the encap type */
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encap_type = 0;
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if (x->props.replay_window)
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xfrm_replay_advance(x, seq);
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock(&x->lock);
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2007-11-19 19:47:58 -07:00
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XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
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2007-11-13 22:44:23 -07:00
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if (x->inner_mode->input(x, skb))
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goto drop;
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if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
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decaps = 1;
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break;
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}
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2007-11-19 19:50:17 -07:00
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/*
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* We need the inner address. However, we only get here for
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* transport mode so the outer address is identical.
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*/
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daddr = &x->id.daddr;
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2007-12-03 23:54:12 -07:00
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family = x->outer_mode->afinfo->family;
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2007-11-19 19:50:17 -07:00
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2007-11-13 22:44:23 -07:00
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err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
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if (err < 0)
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goto drop;
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} while (!err);
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nf_reset(skb);
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if (decaps) {
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dst_release(skb->dst);
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skb->dst = NULL;
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netif_rx(skb);
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return 0;
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} else {
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2007-11-19 19:50:17 -07:00
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return x->inner_mode->afinfo->transport_finish(skb, async);
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2007-11-13 22:44:23 -07:00
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}
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drop_unlock:
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spin_unlock(&x->lock);
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drop:
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kfree_skb(skb);
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return 0;
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}
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EXPORT_SYMBOL(xfrm_input);
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2007-11-19 19:50:17 -07:00
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int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
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{
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return xfrm_input(skb, nexthdr, 0, -1);
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}
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EXPORT_SYMBOL(xfrm_input_resume);
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2005-04-16 15:20:36 -07:00
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void __init xfrm_input_init(void)
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{
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secpath_cachep = kmem_cache_create("secpath_cache",
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sizeof(struct sec_path),
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2006-08-26 19:25:52 -07:00
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0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
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2007-07-19 18:11:58 -07:00
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NULL);
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2005-04-16 15:20:36 -07:00
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}
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