Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
4 *
5 * Authors:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * YOSHIFUJI Hideaki @USAGI
10 * IPv6 support
11 */
12
13#include <linux/module.h>
14#include <linux/string.h>
15#include <linux/netfilter.h>
16#include <linux/netfilter_ipv6.h>
17#include <net/ipv6.h>
18#include <net/xfrm.h>
19
20int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
21{
22 return xfrm6_extract_header(skb);
23}
24
25int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
26 struct ip6_tnl *t)
27{
28 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
29 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
30 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
31 return xfrm_input(skb, nexthdr, spi, 0);
32}
33EXPORT_SYMBOL(xfrm6_rcv_spi);
34
35static 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
43int xfrm6_transport_finish(struct sk_buff *skb, int async)
44{
45 struct xfrm_offload *xo = xfrm_offload(skb);
46 int nhlen = skb->data - skb_network_header(skb);
47
48 skb_network_header(skb)[IP6CB(skb)->nhoff] =
49 XFRM_MODE_SKB_CB(skb)->protocol;
50
51#ifndef CONFIG_NETFILTER
52 if (!async)
53 return 1;
54#endif
55
56 __skb_push(skb, nhlen);
57 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
58 skb_postpush_rcsum(skb, skb_network_header(skb), nhlen);
59
60 if (xo && (xo->flags & XFRM_GRO)) {
61 skb_mac_header_rebuild(skb);
62 return -1;
63 }
64
65 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
66 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
67 xfrm6_transport_finish2);
68 return -1;
69}
70
71int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t)
72{
73 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
74 0, t);
75}
76EXPORT_SYMBOL(xfrm6_rcv_tnl);
77
78int xfrm6_rcv(struct sk_buff *skb)
79{
80 return xfrm6_rcv_tnl(skb, NULL);
81}
82EXPORT_SYMBOL(xfrm6_rcv);
83int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
84 xfrm_address_t *saddr, u8 proto)
85{
86 struct net *net = dev_net(skb->dev);
87 struct xfrm_state *x = NULL;
88 int i = 0;
89
90 if (secpath_set(skb)) {
91 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
92 goto drop;
93 }
94
95 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
96 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
97 goto drop;
98 }
99
100 for (i = 0; i < 3; i++) {
101 xfrm_address_t *dst, *src;
102
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 */
110 dst = daddr;
111 src = (xfrm_address_t *)&in6addr_any;
112 break;
113 default:
114 /* lookup state with wild-card addresses */
115 dst = (xfrm_address_t *)&in6addr_any;
116 src = (xfrm_address_t *)&in6addr_any;
117 break;
118 }
119
120 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
121 if (!x)
122 continue;
123
124 spin_lock(&x->lock);
125
126 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
127 likely(x->km.state == XFRM_STATE_VALID) &&
128 !xfrm_state_check_expire(x)) {
129 spin_unlock(&x->lock);
130 if (x->type->input(x, skb) > 0) {
131 /* found a valid state */
132 break;
133 }
134 } else
135 spin_unlock(&x->lock);
136
137 xfrm_state_put(x);
138 x = NULL;
139 }
140
141 if (!x) {
142 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
143 xfrm_audit_state_notfound_simple(skb, AF_INET6);
144 goto drop;
145 }
146
147 skb->sp->xvec[skb->sp->len++] = x;
148
149 spin_lock(&x->lock);
150
151 x->curlft.bytes += skb->len;
152 x->curlft.packets++;
153
154 spin_unlock(&x->lock);
155
156 return 1;
157
158drop:
159 return -1;
160}
161EXPORT_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 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 skb_network_header(skb)[IP6CB(skb)->nhoff] =
37 XFRM_MODE_SKB_CB(skb)->protocol;
38
39#ifndef CONFIG_NETFILTER
40 if (!async)
41 return 1;
42#endif
43
44 ipv6_hdr(skb)->payload_len = htons(skb->len);
45 __skb_push(skb, skb->data - skb_network_header(skb));
46
47 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
48 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
49 ip6_rcv_finish);
50 return -1;
51}
52
53int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t)
54{
55 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
56 0, t);
57}
58EXPORT_SYMBOL(xfrm6_rcv_tnl);
59
60int xfrm6_rcv(struct sk_buff *skb)
61{
62 return xfrm6_rcv_tnl(skb, NULL);
63}
64EXPORT_SYMBOL(xfrm6_rcv);
65int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
66 xfrm_address_t *saddr, u8 proto)
67{
68 struct net *net = dev_net(skb->dev);
69 struct xfrm_state *x = NULL;
70 int i = 0;
71
72 /* Allocate new secpath or COW existing one. */
73 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
74 struct sec_path *sp;
75
76 sp = secpath_dup(skb->sp);
77 if (!sp) {
78 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
79 goto drop;
80 }
81 if (skb->sp)
82 secpath_put(skb->sp);
83 skb->sp = sp;
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);