Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * xfrm6_state.c: based on xfrm4_state.c |
| 3 | * |
| 4 | * Authors: |
| 5 | * Mitsuru KANDA @USAGI |
| 6 | * Kazunori MIYAZAWA @USAGI |
| 7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| 8 | * IPv6 support |
| 9 | * YOSHIFUJI Hideaki @USAGI |
| 10 | * Split up af-specific portion |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | #include <net/xfrm.h> |
| 15 | #include <linux/pfkeyv2.h> |
| 16 | #include <linux/ipsec.h> |
Herbert Xu | 862b82c | 2007-11-13 21:43:11 -0800 | [diff] [blame] | 17 | #include <linux/netfilter_ipv6.h> |
Herbert Xu | 36cf9ac | 2007-11-13 21:40:52 -0800 | [diff] [blame] | 18 | #include <net/dsfield.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <net/ipv6.h> |
Patrick McHardy | ee51b1b | 2006-01-13 14:34:36 -0800 | [diff] [blame] | 20 | #include <net/addrconf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | static struct xfrm_state_afinfo xfrm6_state_afinfo; |
| 23 | |
| 24 | static void |
| 25 | __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl, |
| 26 | struct xfrm_tmpl *tmpl, |
| 27 | xfrm_address_t *daddr, xfrm_address_t *saddr) |
| 28 | { |
| 29 | /* Initialize temporary selector matching only |
| 30 | * to current session. */ |
| 31 | ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst); |
| 32 | ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src); |
| 33 | x->sel.dport = xfrm_flowi_dport(fl); |
Al Viro | 8f83f23 | 2006-09-27 18:46:11 -0700 | [diff] [blame] | 34 | x->sel.dport_mask = htons(0xffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | x->sel.sport = xfrm_flowi_sport(fl); |
Al Viro | 8f83f23 | 2006-09-27 18:46:11 -0700 | [diff] [blame] | 36 | x->sel.sport_mask = htons(0xffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | x->sel.prefixlen_d = 128; |
| 38 | x->sel.prefixlen_s = 128; |
| 39 | x->sel.proto = fl->proto; |
| 40 | x->sel.ifindex = fl->oif; |
| 41 | x->id = tmpl->id; |
| 42 | if (ipv6_addr_any((struct in6_addr*)&x->id.daddr)) |
| 43 | memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); |
| 44 | memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); |
| 45 | if (ipv6_addr_any((struct in6_addr*)&x->props.saddr)) |
| 46 | memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | x->props.mode = tmpl->mode; |
| 48 | x->props.reqid = tmpl->reqid; |
| 49 | x->props.family = AF_INET6; |
| 50 | } |
| 51 | |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 52 | static int |
| 53 | __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n) |
| 54 | { |
| 55 | int i; |
| 56 | int j = 0; |
| 57 | |
| 58 | /* Rule 1: select IPsec transport except AH */ |
| 59 | for (i = 0; i < n; i++) { |
| 60 | if (src[i]->props.mode == XFRM_MODE_TRANSPORT && |
| 61 | src[i]->id.proto != IPPROTO_AH) { |
| 62 | dst[j++] = src[i]; |
| 63 | src[i] = NULL; |
| 64 | } |
| 65 | } |
| 66 | if (j == n) |
| 67 | goto end; |
| 68 | |
Masahide NAKAMURA | 64d9fdd | 2006-08-23 22:54:07 -0700 | [diff] [blame] | 69 | /* Rule 2: select MIPv6 RO or inbound trigger */ |
Masahide NAKAMURA | 59fbb3a | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 70 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 64d9fdd | 2006-08-23 22:54:07 -0700 | [diff] [blame] | 71 | for (i = 0; i < n; i++) { |
| 72 | if (src[i] && |
| 73 | (src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION || |
| 74 | src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) { |
| 75 | dst[j++] = src[i]; |
| 76 | src[i] = NULL; |
| 77 | } |
| 78 | } |
| 79 | if (j == n) |
| 80 | goto end; |
| 81 | #endif |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 82 | |
| 83 | /* Rule 3: select IPsec transport AH */ |
| 84 | for (i = 0; i < n; i++) { |
| 85 | if (src[i] && |
| 86 | src[i]->props.mode == XFRM_MODE_TRANSPORT && |
| 87 | src[i]->id.proto == IPPROTO_AH) { |
| 88 | dst[j++] = src[i]; |
| 89 | src[i] = NULL; |
| 90 | } |
| 91 | } |
| 92 | if (j == n) |
| 93 | goto end; |
| 94 | |
| 95 | /* Rule 4: select IPsec tunnel */ |
| 96 | for (i = 0; i < n; i++) { |
| 97 | if (src[i] && |
Herbert Xu | 1bfcb10 | 2007-10-17 21:31:50 -0700 | [diff] [blame] | 98 | (src[i]->props.mode == XFRM_MODE_TUNNEL || |
| 99 | src[i]->props.mode == XFRM_MODE_BEET)) { |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 100 | dst[j++] = src[i]; |
| 101 | src[i] = NULL; |
| 102 | } |
| 103 | } |
| 104 | if (likely(j == n)) |
| 105 | goto end; |
| 106 | |
| 107 | /* Final rule */ |
| 108 | for (i = 0; i < n; i++) { |
| 109 | if (src[i]) { |
| 110 | dst[j++] = src[i]; |
| 111 | src[i] = NULL; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | end: |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static int |
| 120 | __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n) |
| 121 | { |
| 122 | int i; |
| 123 | int j = 0; |
| 124 | |
| 125 | /* Rule 1: select IPsec transport */ |
| 126 | for (i = 0; i < n; i++) { |
| 127 | if (src[i]->mode == XFRM_MODE_TRANSPORT) { |
| 128 | dst[j++] = src[i]; |
| 129 | src[i] = NULL; |
| 130 | } |
| 131 | } |
| 132 | if (j == n) |
| 133 | goto end; |
| 134 | |
Masahide NAKAMURA | 64d9fdd | 2006-08-23 22:54:07 -0700 | [diff] [blame] | 135 | /* Rule 2: select MIPv6 RO or inbound trigger */ |
Masahide NAKAMURA | 59fbb3a | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 136 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 64d9fdd | 2006-08-23 22:54:07 -0700 | [diff] [blame] | 137 | for (i = 0; i < n; i++) { |
| 138 | if (src[i] && |
| 139 | (src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION || |
| 140 | src[i]->mode == XFRM_MODE_IN_TRIGGER)) { |
| 141 | dst[j++] = src[i]; |
| 142 | src[i] = NULL; |
| 143 | } |
| 144 | } |
| 145 | if (j == n) |
| 146 | goto end; |
| 147 | #endif |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 148 | |
| 149 | /* Rule 3: select IPsec tunnel */ |
| 150 | for (i = 0; i < n; i++) { |
| 151 | if (src[i] && |
Herbert Xu | 1bfcb10 | 2007-10-17 21:31:50 -0700 | [diff] [blame] | 152 | (src[i]->mode == XFRM_MODE_TUNNEL || |
| 153 | src[i]->mode == XFRM_MODE_BEET)) { |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 154 | dst[j++] = src[i]; |
| 155 | src[i] = NULL; |
| 156 | } |
| 157 | } |
| 158 | if (likely(j == n)) |
| 159 | goto end; |
| 160 | |
| 161 | /* Final rule */ |
| 162 | for (i = 0; i < n; i++) { |
| 163 | if (src[i]) { |
| 164 | dst[j++] = src[i]; |
| 165 | src[i] = NULL; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | end: |
| 170 | return 0; |
| 171 | } |
| 172 | |
Herbert Xu | 36cf9ac | 2007-11-13 21:40:52 -0800 | [diff] [blame] | 173 | int xfrm6_extract_header(struct sk_buff *skb) |
| 174 | { |
| 175 | struct ipv6hdr *iph = ipv6_hdr(skb); |
| 176 | |
| 177 | XFRM_MODE_SKB_CB(skb)->id = 0; |
| 178 | XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF); |
| 179 | XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph); |
| 180 | XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit; |
Herbert Xu | 36cf9ac | 2007-11-13 21:40:52 -0800 | [diff] [blame] | 181 | memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl, |
| 182 | sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | static struct xfrm_state_afinfo xfrm6_state_afinfo = { |
| 188 | .family = AF_INET6, |
Herbert Xu | 36cf9ac | 2007-11-13 21:40:52 -0800 | [diff] [blame] | 189 | .proto = IPPROTO_IPV6, |
Herbert Xu | 227620e | 2007-11-13 21:41:28 -0800 | [diff] [blame] | 190 | .eth_proto = htons(ETH_P_IPV6), |
Herbert Xu | 17c2a42 | 2007-10-17 21:33:12 -0700 | [diff] [blame] | 191 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | .init_tempsel = __xfrm6_init_tempsel, |
Masahide NAKAMURA | 58c949d | 2006-08-23 22:51:02 -0700 | [diff] [blame] | 193 | .tmpl_sort = __xfrm6_tmpl_sort, |
| 194 | .state_sort = __xfrm6_state_sort, |
Miika Komu | cdca726 | 2007-02-06 14:24:56 -0800 | [diff] [blame] | 195 | .output = xfrm6_output, |
Herbert Xu | 227620e | 2007-11-13 21:41:28 -0800 | [diff] [blame] | 196 | .extract_input = xfrm6_extract_input, |
Herbert Xu | 36cf9ac | 2007-11-13 21:40:52 -0800 | [diff] [blame] | 197 | .extract_output = xfrm6_extract_output, |
Herbert Xu | 716062f | 2007-11-13 21:44:23 -0800 | [diff] [blame] | 198 | .transport_finish = xfrm6_transport_finish, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | }; |
| 200 | |
Daniel Lezcano | 0013cab | 2007-12-07 00:42:11 -0800 | [diff] [blame] | 201 | int __init xfrm6_state_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
Daniel Lezcano | 0013cab | 2007-12-07 00:42:11 -0800 | [diff] [blame] | 203 | return xfrm_state_register_afinfo(&xfrm6_state_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | void xfrm6_state_fini(void) |
| 207 | { |
| 208 | xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); |
| 209 | } |
| 210 | |