5 * YOSHIFUJI Hideaki @USAGI
6 * Split up af-specific portion
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/netdevice.h>
17 static struct kmem_cache *secpath_cachep __read_mostly;
19 void __secpath_destroy(struct sec_path *sp)
22 for (i = 0; i < sp->len; i++)
23 xfrm_state_put(sp->xvec[i]);
24 kmem_cache_free(secpath_cachep, sp);
26 EXPORT_SYMBOL(__secpath_destroy);
28 struct sec_path *secpath_dup(struct sec_path *src)
32 sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
40 memcpy(sp, src, sizeof(*sp));
41 for (i = 0; i < sp->len; i++)
42 xfrm_state_hold(sp->xvec[i]);
44 atomic_set(&sp->refcnt, 1);
47 EXPORT_SYMBOL(secpath_dup);
49 /* Fetch spi and seq from ipsec header */
51 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
53 int offset, offset_seq;
58 hlen = sizeof(struct ip_auth_hdr);
59 offset = offsetof(struct ip_auth_hdr, spi);
60 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
63 hlen = sizeof(struct ip_esp_hdr);
64 offset = offsetof(struct ip_esp_hdr, spi);
65 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
68 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
70 *spi = htonl(ntohs(*(__be16*)(skb_transport_header(skb) + 2)));
77 if (!pskb_may_pull(skb, hlen))
80 *spi = *(__be32*)(skb_transport_header(skb) + offset);
81 *seq = *(__be32*)(skb_transport_header(skb) + offset_seq);
84 EXPORT_SYMBOL(xfrm_parse_spi);
86 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
90 err = x->outer_mode->afinfo->extract_input(x, skb);
94 skb->protocol = x->inner_mode->afinfo->eth_proto;
95 return x->inner_mode->input2(x, skb);
97 EXPORT_SYMBOL(xfrm_prepare_input);
99 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
103 struct xfrm_state *x;
105 unsigned int daddroff = XFRM_SPI_SKB_CB(skb)->daddroff;
107 /* Allocate new secpath or COW existing one. */
108 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
111 sp = secpath_dup(skb->sp);
115 secpath_put(skb->sp);
120 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
124 if (skb->sp->len == XFRM_MAX_DEPTH)
127 x = xfrm_state_lookup((xfrm_address_t *)
128 (skb_network_header(skb) + daddroff),
129 spi, nexthdr, AF_INET);
133 skb->sp->xvec[skb->sp->len++] = x;
136 if (unlikely(x->km.state != XFRM_STATE_VALID))
139 if ((x->encap ? x->encap->encap_type : 0) != encap_type)
142 if (x->props.replay_window && xfrm_replay_check(x, seq))
145 if (xfrm_state_check_expire(x))
148 spin_unlock(&x->lock);
150 nexthdr = x->type->input(x, skb);
154 if (nexthdr == -EBADMSG)
155 x->stats.integrity_failed++;
159 /* only the first xfrm gets the encap type */
162 if (x->props.replay_window)
163 xfrm_replay_advance(x, seq);
165 x->curlft.bytes += skb->len;
168 spin_unlock(&x->lock);
170 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
172 if (x->inner_mode->input(x, skb))
175 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
180 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
188 dst_release(skb->dst);
193 return x->inner_mode->afinfo->transport_finish(skb, 0);
197 spin_unlock(&x->lock);
202 EXPORT_SYMBOL(xfrm_input);
204 void __init xfrm_input_init(void)
206 secpath_cachep = kmem_cache_create("secpath_cache",
207 sizeof(struct sec_path),
208 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,