Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm6_input.c: based on net/ipv4/xfrm4_input.c | |
3 | * | |
4 | * Authors: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * YOSHIFUJI Hideaki @USAGI | |
9 | * IPv6 support | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/string.h> | |
b05e1066 PM |
14 | #include <linux/netfilter.h> |
15 | #include <linux/netfilter_ipv6.h> | |
1da177e4 LT |
16 | #include <net/ipv6.h> |
17 | #include <net/xfrm.h> | |
18 | ||
d2acc347 | 19 | int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi) |
1da177e4 | 20 | { |
1da177e4 LT |
21 | int err; |
22 | u32 seq; | |
dbe5b4aa | 23 | struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH]; |
1da177e4 LT |
24 | struct xfrm_state *x; |
25 | int xfrm_nr = 0; | |
26 | int decaps = 0; | |
27 | int nexthdr; | |
28 | unsigned int nhoff; | |
29 | ||
951dbc8a | 30 | nhoff = IP6CB(skb)->nhoff; |
1da177e4 LT |
31 | nexthdr = skb->nh.raw[nhoff]; |
32 | ||
33 | seq = 0; | |
34 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) | |
35 | goto drop; | |
36 | ||
37 | do { | |
38 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
39 | ||
40 | if (xfrm_nr == XFRM_MAX_DEPTH) | |
41 | goto drop; | |
42 | ||
43 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, nexthdr, AF_INET6); | |
44 | if (x == NULL) | |
45 | goto drop; | |
46 | spin_lock(&x->lock); | |
47 | if (unlikely(x->km.state != XFRM_STATE_VALID)) | |
48 | goto drop_unlock; | |
49 | ||
50 | if (x->props.replay_window && xfrm_replay_check(x, seq)) | |
51 | goto drop_unlock; | |
52 | ||
53 | if (xfrm_state_check_expire(x)) | |
54 | goto drop_unlock; | |
55 | ||
e695633e | 56 | nexthdr = x->type->input(x, skb); |
1da177e4 LT |
57 | if (nexthdr <= 0) |
58 | goto drop_unlock; | |
59 | ||
60 | skb->nh.raw[nhoff] = nexthdr; | |
61 | ||
62 | if (x->props.replay_window) | |
63 | xfrm_replay_advance(x, seq); | |
64 | ||
65 | x->curlft.bytes += skb->len; | |
66 | x->curlft.packets++; | |
67 | ||
68 | spin_unlock(&x->lock); | |
69 | ||
dbe5b4aa | 70 | xfrm_vec[xfrm_nr++] = x; |
1da177e4 | 71 | |
b59f45d0 HX |
72 | if (x->mode->input(x, skb)) |
73 | goto drop; | |
74 | ||
1da177e4 | 75 | if (x->props.mode) { /* XXX */ |
1da177e4 LT |
76 | decaps = 1; |
77 | break; | |
78 | } | |
79 | ||
80 | if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0) | |
81 | goto drop; | |
82 | } while (!err); | |
83 | ||
84 | /* Allocate new secpath or COW existing one. */ | |
85 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { | |
86 | struct sec_path *sp; | |
87 | sp = secpath_dup(skb->sp); | |
88 | if (!sp) | |
89 | goto drop; | |
90 | if (skb->sp) | |
91 | secpath_put(skb->sp); | |
92 | skb->sp = sp; | |
93 | } | |
94 | ||
95 | if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH) | |
96 | goto drop; | |
97 | ||
dbe5b4aa HX |
98 | memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec, |
99 | xfrm_nr * sizeof(xfrm_vec[0])); | |
1da177e4 LT |
100 | skb->sp->len += xfrm_nr; |
101 | skb->ip_summed = CHECKSUM_NONE; | |
102 | ||
b05e1066 PM |
103 | nf_reset(skb); |
104 | ||
1da177e4 LT |
105 | if (decaps) { |
106 | if (!(skb->dev->flags&IFF_LOOPBACK)) { | |
107 | dst_release(skb->dst); | |
108 | skb->dst = NULL; | |
109 | } | |
110 | netif_rx(skb); | |
111 | return -1; | |
112 | } else { | |
b05e1066 PM |
113 | #ifdef CONFIG_NETFILTER |
114 | skb->nh.ipv6h->payload_len = htons(skb->len); | |
115 | __skb_push(skb, skb->data - skb->nh.raw); | |
116 | ||
117 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
118 | ip6_rcv_finish); | |
119 | return -1; | |
120 | #else | |
1da177e4 | 121 | return 1; |
b05e1066 | 122 | #endif |
1da177e4 LT |
123 | } |
124 | ||
125 | drop_unlock: | |
126 | spin_unlock(&x->lock); | |
127 | xfrm_state_put(x); | |
128 | drop: | |
129 | while (--xfrm_nr >= 0) | |
dbe5b4aa | 130 | xfrm_state_put(xfrm_vec[xfrm_nr]); |
1da177e4 LT |
131 | kfree_skb(skb); |
132 | return -1; | |
133 | } | |
134 | ||
135 | EXPORT_SYMBOL(xfrm6_rcv_spi); | |
136 | ||
951dbc8a | 137 | int xfrm6_rcv(struct sk_buff **pskb) |
1da177e4 | 138 | { |
d2acc347 | 139 | return xfrm6_rcv_spi(*pskb, 0); |
1da177e4 | 140 | } |