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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{
26 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
27 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
28 return xfrm_input(skb, nexthdr, spi, 0);
29}
30EXPORT_SYMBOL(xfrm6_rcv_spi);
31
32int xfrm6_transport_finish(struct sk_buff *skb, int async)
33{
34 skb_network_header(skb)[IP6CB(skb)->nhoff] =
35 XFRM_MODE_SKB_CB(skb)->protocol;
36
37#ifndef CONFIG_NETFILTER
38 if (!async)
39 return 1;
40#endif
41
42 ipv6_hdr(skb)->payload_len = htons(skb->len);
43 __skb_push(skb, skb->data - skb_network_header(skb));
44
45 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
46 ip6_rcv_finish);
47 return -1;
48}
49
50int xfrm6_rcv(struct sk_buff *skb)
51{
52 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
53 0);
54}
55
56EXPORT_SYMBOL(xfrm6_rcv);
57
58int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
59 xfrm_address_t *saddr, u8 proto)
60{
61 struct net *net = dev_net(skb->dev);
62 struct xfrm_state *x = NULL;
63 int i = 0;
64
65 /* Allocate new secpath or COW existing one. */
66 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
67 struct sec_path *sp;
68
69 sp = secpath_dup(skb->sp);
70 if (!sp) {
71 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
72 goto drop;
73 }
74 if (skb->sp)
75 secpath_put(skb->sp);
76 skb->sp = sp;
77 }
78
79 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
80 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
81 goto drop;
82 }
83
84 for (i = 0; i < 3; i++) {
85 xfrm_address_t *dst, *src;
86
87 switch (i) {
88 case 0:
89 dst = daddr;
90 src = saddr;
91 break;
92 case 1:
93 /* lookup state with wild-card source address */
94 dst = daddr;
95 src = (xfrm_address_t *)&in6addr_any;
96 break;
97 default:
98 /* lookup state with wild-card addresses */
99 dst = (xfrm_address_t *)&in6addr_any;
100 src = (xfrm_address_t *)&in6addr_any;
101 break;
102 }
103
104 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
105 if (!x)
106 continue;
107
108 spin_lock(&x->lock);
109
110 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
111 likely(x->km.state == XFRM_STATE_VALID) &&
112 !xfrm_state_check_expire(x)) {
113 spin_unlock(&x->lock);
114 if (x->type->input(x, skb) > 0) {
115 /* found a valid state */
116 break;
117 }
118 } else
119 spin_unlock(&x->lock);
120
121 xfrm_state_put(x);
122 x = NULL;
123 }
124
125 if (!x) {
126 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
127 xfrm_audit_state_notfound_simple(skb, AF_INET6);
128 goto drop;
129 }
130
131 skb->sp->xvec[skb->sp->len++] = x;
132
133 spin_lock(&x->lock);
134
135 x->curlft.bytes += skb->len;
136 x->curlft.packets++;
137
138 spin_unlock(&x->lock);
139
140 return 1;
141
142drop:
143 return -1;
144}
145
146EXPORT_SYMBOL(xfrm6_input_addr);
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{
26 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
27 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
28 return xfrm_input(skb, nexthdr, spi, 0);
29}
30EXPORT_SYMBOL(xfrm6_rcv_spi);
31
32int xfrm6_transport_finish(struct sk_buff *skb, int async)
33{
34 skb_network_header(skb)[IP6CB(skb)->nhoff] =
35 XFRM_MODE_SKB_CB(skb)->protocol;
36
37#ifndef CONFIG_NETFILTER
38 if (!async)
39 return 1;
40#endif
41
42 ipv6_hdr(skb)->payload_len = htons(skb->len);
43 __skb_push(skb, skb->data - skb_network_header(skb));
44
45 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
46 ip6_rcv_finish);
47 return -1;
48}
49
50int xfrm6_rcv(struct sk_buff *skb)
51{
52 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
53 0);
54}
55
56EXPORT_SYMBOL(xfrm6_rcv);
57
58int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
59 xfrm_address_t *saddr, u8 proto)
60{
61 struct net *net = dev_net(skb->dev);
62 struct xfrm_state *x = NULL;
63 int i = 0;
64
65 /* Allocate new secpath or COW existing one. */
66 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
67 struct sec_path *sp;
68
69 sp = secpath_dup(skb->sp);
70 if (!sp) {
71 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
72 goto drop;
73 }
74 if (skb->sp)
75 secpath_put(skb->sp);
76 skb->sp = sp;
77 }
78
79 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
80 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
81 goto drop;
82 }
83
84 for (i = 0; i < 3; i++) {
85 xfrm_address_t *dst, *src;
86
87 switch (i) {
88 case 0:
89 dst = daddr;
90 src = saddr;
91 break;
92 case 1:
93 /* lookup state with wild-card source address */
94 dst = daddr;
95 src = (xfrm_address_t *)&in6addr_any;
96 break;
97 default:
98 /* lookup state with wild-card addresses */
99 dst = (xfrm_address_t *)&in6addr_any;
100 src = (xfrm_address_t *)&in6addr_any;
101 break;
102 }
103
104 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
105 if (!x)
106 continue;
107
108 spin_lock(&x->lock);
109
110 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
111 likely(x->km.state == XFRM_STATE_VALID) &&
112 !xfrm_state_check_expire(x)) {
113 spin_unlock(&x->lock);
114 if (x->type->input(x, skb) > 0) {
115 /* found a valid state */
116 break;
117 }
118 } else
119 spin_unlock(&x->lock);
120
121 xfrm_state_put(x);
122 x = NULL;
123 }
124
125 if (!x) {
126 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
127 xfrm_audit_state_notfound_simple(skb, AF_INET6);
128 goto drop;
129 }
130
131 skb->sp->xvec[skb->sp->len++] = x;
132
133 spin_lock(&x->lock);
134
135 x->curlft.bytes += skb->len;
136 x->curlft.packets++;
137
138 spin_unlock(&x->lock);
139
140 return 1;
141
142drop:
143 return -1;
144}
145
146EXPORT_SYMBOL(xfrm6_input_addr);