Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Patrick McHardy | b05e106 | 2006-01-06 23:03:34 -0800 | [diff] [blame] | 14 | #include <linux/netfilter.h> |
| 15 | #include <linux/netfilter_ipv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <net/ipv6.h> |
| 17 | #include <net/xfrm.h> |
| 18 | |
Herbert Xu | 227620e | 2007-11-13 21:41:28 -0800 | [diff] [blame] | 19 | int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) |
| 20 | { |
| 21 | return xfrm6_extract_header(skb); |
| 22 | } |
| 23 | |
Herbert Xu | 33b5ecb | 2007-10-17 21:29:25 -0700 | [diff] [blame] | 24 | int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
Herbert Xu | 716062f | 2007-11-13 21:44:23 -0800 | [diff] [blame^] | 26 | XFRM_SPI_SKB_CB(skb)->nhoff = IP6CB(skb)->nhoff; |
| 27 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); |
| 28 | return xfrm_input(skb, nexthdr, spi, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | EXPORT_SYMBOL(xfrm6_rcv_spi); |
| 31 | |
Herbert Xu | 716062f | 2007-11-13 21:44:23 -0800 | [diff] [blame^] | 32 | int xfrm6_transport_finish(struct sk_buff *skb, int async) |
| 33 | { |
| 34 | #ifdef CONFIG_NETFILTER |
| 35 | ipv6_hdr(skb)->payload_len = htons(skb->len); |
| 36 | __skb_push(skb, skb->data - skb_network_header(skb)); |
| 37 | |
| 38 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, |
| 39 | ip6_rcv_finish); |
| 40 | return -1; |
| 41 | #else |
| 42 | return 1; |
| 43 | #endif |
| 44 | } |
| 45 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 46 | int xfrm6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | { |
Herbert Xu | 33b5ecb | 2007-10-17 21:29:25 -0700 | [diff] [blame] | 48 | return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], |
| 49 | 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 51 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 52 | EXPORT_SYMBOL(xfrm6_rcv); |
| 53 | |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 54 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
| 55 | xfrm_address_t *saddr, u8 proto) |
| 56 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 57 | struct xfrm_state *x = NULL; |
| 58 | int wildcard = 0; |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 59 | xfrm_address_t *xany; |
| 60 | struct xfrm_state *xfrm_vec_one = NULL; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 61 | int nh = 0; |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 62 | int i = 0; |
| 63 | |
YOSHIFUJI Hideaki | c53b359 | 2007-04-24 20:44:50 +0900 | [diff] [blame] | 64 | xany = (xfrm_address_t *)&in6addr_any; |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 65 | |
| 66 | for (i = 0; i < 3; i++) { |
| 67 | xfrm_address_t *dst, *src; |
| 68 | switch (i) { |
| 69 | case 0: |
| 70 | dst = daddr; |
| 71 | src = saddr; |
| 72 | break; |
| 73 | case 1: |
| 74 | /* lookup state with wild-card source address */ |
| 75 | wildcard = 1; |
| 76 | dst = daddr; |
| 77 | src = xany; |
| 78 | break; |
| 79 | case 2: |
| 80 | default: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 81 | /* lookup state with wild-card addresses */ |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 82 | wildcard = 1; /* XXX */ |
| 83 | dst = xany; |
| 84 | src = xany; |
| 85 | break; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 86 | } |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 87 | |
| 88 | x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6); |
| 89 | if (!x) |
| 90 | continue; |
| 91 | |
| 92 | spin_lock(&x->lock); |
| 93 | |
| 94 | if (wildcard) { |
| 95 | if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) { |
| 96 | spin_unlock(&x->lock); |
| 97 | xfrm_state_put(x); |
| 98 | x = NULL; |
| 99 | continue; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
| 104 | spin_unlock(&x->lock); |
| 105 | xfrm_state_put(x); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 106 | x = NULL; |
| 107 | continue; |
Masahide NAKAMURA | fbd9a5b | 2006-08-23 18:08:21 -0700 | [diff] [blame] | 108 | } |
| 109 | if (xfrm_state_check_expire(x)) { |
| 110 | spin_unlock(&x->lock); |
| 111 | xfrm_state_put(x); |
| 112 | x = NULL; |
| 113 | continue; |
| 114 | } |
| 115 | |
| 116 | nh = x->type->input(x, skb); |
| 117 | if (nh <= 0) { |
| 118 | spin_unlock(&x->lock); |
| 119 | xfrm_state_put(x); |
| 120 | x = NULL; |
| 121 | continue; |
| 122 | } |
| 123 | |
| 124 | x->curlft.bytes += skb->len; |
| 125 | x->curlft.packets++; |
| 126 | |
| 127 | spin_unlock(&x->lock); |
| 128 | |
| 129 | xfrm_vec_one = x; |
| 130 | break; |
| 131 | } |
| 132 | |
| 133 | if (!xfrm_vec_one) |
| 134 | goto drop; |
| 135 | |
| 136 | /* Allocate new secpath or COW existing one. */ |
| 137 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { |
| 138 | struct sec_path *sp; |
| 139 | sp = secpath_dup(skb->sp); |
| 140 | if (!sp) |
| 141 | goto drop; |
| 142 | if (skb->sp) |
| 143 | secpath_put(skb->sp); |
| 144 | skb->sp = sp; |
| 145 | } |
| 146 | |
| 147 | if (1 + skb->sp->len > XFRM_MAX_DEPTH) |
| 148 | goto drop; |
| 149 | |
| 150 | skb->sp->xvec[skb->sp->len] = xfrm_vec_one; |
| 151 | skb->sp->len ++; |
| 152 | |
| 153 | return 1; |
| 154 | drop: |
| 155 | if (xfrm_vec_one) |
| 156 | xfrm_state_put(xfrm_vec_one); |
| 157 | return -1; |
| 158 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 159 | |
| 160 | EXPORT_SYMBOL(xfrm6_input_addr); |