Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * xfrm6_input.c: based on net/ipv4/xfrm4_input.c | |
4 | * | |
5 | * Authors: | |
6 | * Mitsuru KANDA @USAGI | |
67ba4152 IM |
7 | * Kazunori MIYAZAWA @USAGI |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1da177e4 LT |
9 | * YOSHIFUJI Hideaki @USAGI |
10 | * IPv6 support | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/string.h> | |
b05e1066 PM |
15 | #include <linux/netfilter.h> |
16 | #include <linux/netfilter_ipv6.h> | |
1da177e4 LT |
17 | #include <net/ipv6.h> |
18 | #include <net/xfrm.h> | |
19 | ||
227620e2 HX |
20 | int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) |
21 | { | |
22 | return xfrm6_extract_header(skb); | |
23 | } | |
24 | ||
63c43787 ND |
25 | int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, |
26 | struct ip6_tnl *t) | |
1da177e4 | 27 | { |
63c43787 | 28 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
2fcb45b6 | 29 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; |
716062fd HX |
30 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); |
31 | return xfrm_input(skb, nexthdr, spi, 0); | |
32 | } | |
33 | EXPORT_SYMBOL(xfrm6_rcv_spi); | |
b05e1066 | 34 | |
716062fd HX |
35 | int xfrm6_transport_finish(struct sk_buff *skb, int async) |
36 | { | |
7785bba2 | 37 | struct xfrm_offload *xo = xfrm_offload(skb); |
e9cba694 | 38 | int nhlen = skb->data - skb_network_header(skb); |
7785bba2 | 39 | |
60d5fcfb HX |
40 | skb_network_header(skb)[IP6CB(skb)->nhoff] = |
41 | XFRM_MODE_SKB_CB(skb)->protocol; | |
42 | ||
0883ae0e HX |
43 | #ifndef CONFIG_NETFILTER |
44 | if (!async) | |
45 | return 1; | |
46 | #endif | |
47 | ||
e9cba694 | 48 | __skb_push(skb, nhlen); |
7c88e21a | 49 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); |
e9cba694 | 50 | skb_postpush_rcsum(skb, skb_network_header(skb), nhlen); |
b05e1066 | 51 | |
7785bba2 SK |
52 | if (xo && (xo->flags & XFRM_GRO)) { |
53 | skb_mac_header_rebuild(skb); | |
54 | return -1; | |
55 | } | |
56 | ||
29a26a56 EB |
57 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, |
58 | dev_net(skb->dev), NULL, skb, skb->dev, NULL, | |
716062fd HX |
59 | ip6_rcv_finish); |
60 | return -1; | |
1da177e4 LT |
61 | } |
62 | ||
63c43787 | 63 | int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t) |
1da177e4 | 64 | { |
33b5ecb8 | 65 | return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], |
63c43787 | 66 | 0, t); |
1da177e4 | 67 | } |
63c43787 | 68 | EXPORT_SYMBOL(xfrm6_rcv_tnl); |
7159039a | 69 | |
63c43787 ND |
70 | int xfrm6_rcv(struct sk_buff *skb) |
71 | { | |
72 | return xfrm6_rcv_tnl(skb, NULL); | |
73 | } | |
74 | EXPORT_SYMBOL(xfrm6_rcv); | |
fbd9a5b4 MN |
75 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
76 | xfrm_address_t *saddr, u8 proto) | |
77 | { | |
59c9940e | 78 | struct net *net = dev_net(skb->dev); |
1ab1457c | 79 | struct xfrm_state *x = NULL; |
fbd9a5b4 MN |
80 | int i = 0; |
81 | ||
b0fcee82 SK |
82 | if (secpath_set(skb)) { |
83 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); | |
84 | goto drop; | |
9473e1f6 MN |
85 | } |
86 | ||
87 | if (1 + skb->sp->len == XFRM_MAX_DEPTH) { | |
59c9940e | 88 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
9473e1f6 MN |
89 | goto drop; |
90 | } | |
91 | ||
fbd9a5b4 MN |
92 | for (i = 0; i < 3; i++) { |
93 | xfrm_address_t *dst, *src; | |
a002c6fd | 94 | |
fbd9a5b4 MN |
95 | switch (i) { |
96 | case 0: | |
97 | dst = daddr; | |
98 | src = saddr; | |
99 | break; | |
100 | case 1: | |
101 | /* lookup state with wild-card source address */ | |
fbd9a5b4 | 102 | dst = daddr; |
a002c6fd | 103 | src = (xfrm_address_t *)&in6addr_any; |
fbd9a5b4 | 104 | break; |
fbd9a5b4 | 105 | default: |
1ab1457c | 106 | /* lookup state with wild-card addresses */ |
a002c6fd YH |
107 | dst = (xfrm_address_t *)&in6addr_any; |
108 | src = (xfrm_address_t *)&in6addr_any; | |
fbd9a5b4 | 109 | break; |
1ab1457c | 110 | } |
fbd9a5b4 | 111 | |
bd55775c | 112 | x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); |
fbd9a5b4 MN |
113 | if (!x) |
114 | continue; | |
115 | ||
116 | spin_lock(&x->lock); | |
117 | ||
a002c6fd YH |
118 | if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && |
119 | likely(x->km.state == XFRM_STATE_VALID) && | |
120 | !xfrm_state_check_expire(x)) { | |
fbd9a5b4 | 121 | spin_unlock(&x->lock); |
a002c6fd YH |
122 | if (x->type->input(x, skb) > 0) { |
123 | /* found a valid state */ | |
124 | break; | |
125 | } | |
126 | } else | |
fbd9a5b4 | 127 | spin_unlock(&x->lock); |
fbd9a5b4 | 128 | |
a002c6fd YH |
129 | xfrm_state_put(x); |
130 | x = NULL; | |
fbd9a5b4 MN |
131 | } |
132 | ||
9473e1f6 | 133 | if (!x) { |
59c9940e | 134 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 135 | xfrm_audit_state_notfound_simple(skb, AF_INET6); |
fbd9a5b4 | 136 | goto drop; |
fbd9a5b4 MN |
137 | } |
138 | ||
9473e1f6 MN |
139 | skb->sp->xvec[skb->sp->len++] = x; |
140 | ||
141 | spin_lock(&x->lock); | |
fbd9a5b4 | 142 | |
9473e1f6 MN |
143 | x->curlft.bytes += skb->len; |
144 | x->curlft.packets++; | |
145 | ||
146 | spin_unlock(&x->lock); | |
fbd9a5b4 MN |
147 | |
148 | return 1; | |
9473e1f6 | 149 | |
fbd9a5b4 | 150 | drop: |
fbd9a5b4 MN |
151 | return -1; |
152 | } | |
7159039a | 153 | EXPORT_SYMBOL(xfrm6_input_addr); |