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Commit | Line | Data |
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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 | |
acf568ee HX |
35 | static int xfrm6_transport_finish2(struct net *net, struct sock *sk, |
36 | struct sk_buff *skb) | |
37 | { | |
38 | if (xfrm_trans_queue(skb, ip6_rcv_finish)) | |
39 | __kfree_skb(skb); | |
40 | return -1; | |
41 | } | |
42 | ||
716062fd HX |
43 | int xfrm6_transport_finish(struct sk_buff *skb, int async) |
44 | { | |
7785bba2 | 45 | struct xfrm_offload *xo = xfrm_offload(skb); |
e9cba694 | 46 | int nhlen = skb->data - skb_network_header(skb); |
7785bba2 | 47 | |
60d5fcfb HX |
48 | skb_network_header(skb)[IP6CB(skb)->nhoff] = |
49 | XFRM_MODE_SKB_CB(skb)->protocol; | |
50 | ||
0883ae0e HX |
51 | #ifndef CONFIG_NETFILTER |
52 | if (!async) | |
53 | return 1; | |
54 | #endif | |
55 | ||
e9cba694 | 56 | __skb_push(skb, nhlen); |
7c88e21a | 57 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); |
e9cba694 | 58 | skb_postpush_rcsum(skb, skb_network_header(skb), nhlen); |
b05e1066 | 59 | |
7785bba2 SK |
60 | if (xo && (xo->flags & XFRM_GRO)) { |
61 | skb_mac_header_rebuild(skb); | |
62 | return -1; | |
63 | } | |
64 | ||
29a26a56 EB |
65 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, |
66 | dev_net(skb->dev), NULL, skb, skb->dev, NULL, | |
acf568ee | 67 | xfrm6_transport_finish2); |
716062fd | 68 | return -1; |
1da177e4 LT |
69 | } |
70 | ||
63c43787 | 71 | int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t) |
1da177e4 | 72 | { |
33b5ecb8 | 73 | return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], |
63c43787 | 74 | 0, t); |
1da177e4 | 75 | } |
63c43787 | 76 | EXPORT_SYMBOL(xfrm6_rcv_tnl); |
7159039a | 77 | |
63c43787 ND |
78 | int xfrm6_rcv(struct sk_buff *skb) |
79 | { | |
80 | return xfrm6_rcv_tnl(skb, NULL); | |
81 | } | |
82 | EXPORT_SYMBOL(xfrm6_rcv); | |
fbd9a5b4 MN |
83 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
84 | xfrm_address_t *saddr, u8 proto) | |
85 | { | |
59c9940e | 86 | struct net *net = dev_net(skb->dev); |
1ab1457c | 87 | struct xfrm_state *x = NULL; |
fbd9a5b4 MN |
88 | int i = 0; |
89 | ||
b0fcee82 SK |
90 | if (secpath_set(skb)) { |
91 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); | |
92 | goto drop; | |
9473e1f6 MN |
93 | } |
94 | ||
95 | if (1 + skb->sp->len == XFRM_MAX_DEPTH) { | |
59c9940e | 96 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
9473e1f6 MN |
97 | goto drop; |
98 | } | |
99 | ||
fbd9a5b4 MN |
100 | for (i = 0; i < 3; i++) { |
101 | xfrm_address_t *dst, *src; | |
a002c6fd | 102 | |
fbd9a5b4 MN |
103 | switch (i) { |
104 | case 0: | |
105 | dst = daddr; | |
106 | src = saddr; | |
107 | break; | |
108 | case 1: | |
109 | /* lookup state with wild-card source address */ | |
fbd9a5b4 | 110 | dst = daddr; |
a002c6fd | 111 | src = (xfrm_address_t *)&in6addr_any; |
fbd9a5b4 | 112 | break; |
fbd9a5b4 | 113 | default: |
1ab1457c | 114 | /* lookup state with wild-card addresses */ |
a002c6fd YH |
115 | dst = (xfrm_address_t *)&in6addr_any; |
116 | src = (xfrm_address_t *)&in6addr_any; | |
fbd9a5b4 | 117 | break; |
1ab1457c | 118 | } |
fbd9a5b4 | 119 | |
bd55775c | 120 | x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); |
fbd9a5b4 MN |
121 | if (!x) |
122 | continue; | |
123 | ||
124 | spin_lock(&x->lock); | |
125 | ||
a002c6fd YH |
126 | if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && |
127 | likely(x->km.state == XFRM_STATE_VALID) && | |
128 | !xfrm_state_check_expire(x)) { | |
fbd9a5b4 | 129 | spin_unlock(&x->lock); |
a002c6fd YH |
130 | if (x->type->input(x, skb) > 0) { |
131 | /* found a valid state */ | |
132 | break; | |
133 | } | |
134 | } else | |
fbd9a5b4 | 135 | spin_unlock(&x->lock); |
fbd9a5b4 | 136 | |
a002c6fd YH |
137 | xfrm_state_put(x); |
138 | x = NULL; | |
fbd9a5b4 MN |
139 | } |
140 | ||
9473e1f6 | 141 | if (!x) { |
59c9940e | 142 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 143 | xfrm_audit_state_notfound_simple(skb, AF_INET6); |
fbd9a5b4 | 144 | goto drop; |
fbd9a5b4 MN |
145 | } |
146 | ||
9473e1f6 MN |
147 | skb->sp->xvec[skb->sp->len++] = x; |
148 | ||
149 | spin_lock(&x->lock); | |
fbd9a5b4 | 150 | |
9473e1f6 MN |
151 | x->curlft.bytes += skb->len; |
152 | x->curlft.packets++; | |
153 | ||
154 | spin_unlock(&x->lock); | |
fbd9a5b4 MN |
155 | |
156 | return 1; | |
9473e1f6 | 157 | |
fbd9a5b4 | 158 | drop: |
fbd9a5b4 MN |
159 | return -1; |
160 | } | |
7159039a | 161 | EXPORT_SYMBOL(xfrm6_input_addr); |