tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
14#include <linux/netfilter.h>
15#include <linux/netfilter_ipv6.h>
16#include <net/ipv6.h>
17#include <net/xfrm.h>
18
19int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
20{
21 return xfrm6_extract_header(skb);
22}
23
24int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
25 struct ip6_tnl *t)
26{
27 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
28 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
29 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
30 return xfrm_input(skb, nexthdr, spi, 0);
31}
32EXPORT_SYMBOL(xfrm6_rcv_spi);
33
34int xfrm6_transport_finish(struct sk_buff *skb, int async)
35{
36 struct xfrm_offload *xo = xfrm_offload(skb);
37 int nhlen = skb->data - skb_network_header(skb);
38
39 skb_network_header(skb)[IP6CB(skb)->nhoff] =
40 XFRM_MODE_SKB_CB(skb)->protocol;
41
42#ifndef CONFIG_NETFILTER
43 if (!async)
44 return 1;
45#endif
46
47 __skb_push(skb, nhlen);
48 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
49 skb_postpush_rcsum(skb, skb_network_header(skb), nhlen);
50
51 if (xo && (xo->flags & XFRM_GRO)) {
52 skb_mac_header_rebuild(skb);
53 return -1;
54 }
55
56 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
57 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
58 ip6_rcv_finish);
59 return -1;
60}
61
62int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t)
63{
64 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
65 0, t);
66}
67EXPORT_SYMBOL(xfrm6_rcv_tnl);
68
69int xfrm6_rcv(struct sk_buff *skb)
70{
71 return xfrm6_rcv_tnl(skb, NULL);
72}
73EXPORT_SYMBOL(xfrm6_rcv);
74int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
75 xfrm_address_t *saddr, u8 proto)
76{
77 struct net *net = dev_net(skb->dev);
78 struct xfrm_state *x = NULL;
79 int i = 0;
80
81 if (secpath_set(skb)) {
82 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
83 goto drop;
84 }
85
86 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
87 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
88 goto drop;
89 }
90
91 for (i = 0; i < 3; i++) {
92 xfrm_address_t *dst, *src;
93
94 switch (i) {
95 case 0:
96 dst = daddr;
97 src = saddr;
98 break;
99 case 1:
100 /* lookup state with wild-card source address */
101 dst = daddr;
102 src = (xfrm_address_t *)&in6addr_any;
103 break;
104 default:
105 /* lookup state with wild-card addresses */
106 dst = (xfrm_address_t *)&in6addr_any;
107 src = (xfrm_address_t *)&in6addr_any;
108 break;
109 }
110
111 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
112 if (!x)
113 continue;
114
115 spin_lock(&x->lock);
116
117 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
118 likely(x->km.state == XFRM_STATE_VALID) &&
119 !xfrm_state_check_expire(x)) {
120 spin_unlock(&x->lock);
121 if (x->type->input(x, skb) > 0) {
122 /* found a valid state */
123 break;
124 }
125 } else
126 spin_unlock(&x->lock);
127
128 xfrm_state_put(x);
129 x = NULL;
130 }
131
132 if (!x) {
133 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
134 xfrm_audit_state_notfound_simple(skb, AF_INET6);
135 goto drop;
136 }
137
138 skb->sp->xvec[skb->sp->len++] = x;
139
140 spin_lock(&x->lock);
141
142 x->curlft.bytes += skb->len;
143 x->curlft.packets++;
144
145 spin_unlock(&x->lock);
146
147 return 1;
148
149drop:
150 return -1;
151}
152EXPORT_SYMBOL(xfrm6_input_addr);