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1da177e4 LT |
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 | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <net/xfrm.h> | |
15 | #include <linux/pfkeyv2.h> | |
16 | #include <linux/ipsec.h> | |
17 | #include <net/ipv6.h> | |
ee51b1b6 | 18 | #include <net/addrconf.h> |
1da177e4 LT |
19 | |
20 | static struct xfrm_state_afinfo xfrm6_state_afinfo; | |
21 | ||
22 | static void | |
23 | __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
24 | struct xfrm_tmpl *tmpl, | |
25 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
26 | { | |
27 | /* Initialize temporary selector matching only | |
28 | * to current session. */ | |
29 | ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst); | |
30 | ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src); | |
31 | x->sel.dport = xfrm_flowi_dport(fl); | |
8f83f23e | 32 | x->sel.dport_mask = htons(0xffff); |
1da177e4 | 33 | x->sel.sport = xfrm_flowi_sport(fl); |
8f83f23e | 34 | x->sel.sport_mask = htons(0xffff); |
1da177e4 LT |
35 | x->sel.prefixlen_d = 128; |
36 | x->sel.prefixlen_s = 128; | |
37 | x->sel.proto = fl->proto; | |
38 | x->sel.ifindex = fl->oif; | |
39 | x->id = tmpl->id; | |
40 | if (ipv6_addr_any((struct in6_addr*)&x->id.daddr)) | |
41 | memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); | |
42 | memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); | |
43 | if (ipv6_addr_any((struct in6_addr*)&x->props.saddr)) | |
44 | memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); | |
45 | x->props.mode = tmpl->mode; | |
46 | x->props.reqid = tmpl->reqid; | |
47 | x->props.family = AF_INET6; | |
48 | } | |
49 | ||
58c949d1 MN |
50 | static int |
51 | __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n) | |
52 | { | |
53 | int i; | |
54 | int j = 0; | |
55 | ||
56 | /* Rule 1: select IPsec transport except AH */ | |
57 | for (i = 0; i < n; i++) { | |
58 | if (src[i]->props.mode == XFRM_MODE_TRANSPORT && | |
59 | src[i]->id.proto != IPPROTO_AH) { | |
60 | dst[j++] = src[i]; | |
61 | src[i] = NULL; | |
62 | } | |
63 | } | |
64 | if (j == n) | |
65 | goto end; | |
66 | ||
64d9fdda MN |
67 | /* Rule 2: select MIPv6 RO or inbound trigger */ |
68 | #ifdef CONFIG_IPV6_MIP6 | |
69 | for (i = 0; i < n; i++) { | |
70 | if (src[i] && | |
71 | (src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION || | |
72 | src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) { | |
73 | dst[j++] = src[i]; | |
74 | src[i] = NULL; | |
75 | } | |
76 | } | |
77 | if (j == n) | |
78 | goto end; | |
79 | #endif | |
58c949d1 MN |
80 | |
81 | /* Rule 3: select IPsec transport AH */ | |
82 | for (i = 0; i < n; i++) { | |
83 | if (src[i] && | |
84 | src[i]->props.mode == XFRM_MODE_TRANSPORT && | |
85 | src[i]->id.proto == IPPROTO_AH) { | |
86 | dst[j++] = src[i]; | |
87 | src[i] = NULL; | |
88 | } | |
89 | } | |
90 | if (j == n) | |
91 | goto end; | |
92 | ||
93 | /* Rule 4: select IPsec tunnel */ | |
94 | for (i = 0; i < n; i++) { | |
95 | if (src[i] && | |
96 | src[i]->props.mode == XFRM_MODE_TUNNEL) { | |
97 | dst[j++] = src[i]; | |
98 | src[i] = NULL; | |
99 | } | |
100 | } | |
101 | if (likely(j == n)) | |
102 | goto end; | |
103 | ||
104 | /* Final rule */ | |
105 | for (i = 0; i < n; i++) { | |
106 | if (src[i]) { | |
107 | dst[j++] = src[i]; | |
108 | src[i] = NULL; | |
109 | } | |
110 | } | |
111 | ||
112 | end: | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static int | |
117 | __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n) | |
118 | { | |
119 | int i; | |
120 | int j = 0; | |
121 | ||
122 | /* Rule 1: select IPsec transport */ | |
123 | for (i = 0; i < n; i++) { | |
124 | if (src[i]->mode == XFRM_MODE_TRANSPORT) { | |
125 | dst[j++] = src[i]; | |
126 | src[i] = NULL; | |
127 | } | |
128 | } | |
129 | if (j == n) | |
130 | goto end; | |
131 | ||
64d9fdda MN |
132 | /* Rule 2: select MIPv6 RO or inbound trigger */ |
133 | #ifdef CONFIG_IPV6_MIP6 | |
134 | for (i = 0; i < n; i++) { | |
135 | if (src[i] && | |
136 | (src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION || | |
137 | src[i]->mode == XFRM_MODE_IN_TRIGGER)) { | |
138 | dst[j++] = src[i]; | |
139 | src[i] = NULL; | |
140 | } | |
141 | } | |
142 | if (j == n) | |
143 | goto end; | |
144 | #endif | |
58c949d1 MN |
145 | |
146 | /* Rule 3: select IPsec tunnel */ | |
147 | for (i = 0; i < n; i++) { | |
148 | if (src[i] && | |
149 | src[i]->mode == XFRM_MODE_TUNNEL) { | |
150 | dst[j++] = src[i]; | |
151 | src[i] = NULL; | |
152 | } | |
153 | } | |
154 | if (likely(j == n)) | |
155 | goto end; | |
156 | ||
157 | /* Final rule */ | |
158 | for (i = 0; i < n; i++) { | |
159 | if (src[i]) { | |
160 | dst[j++] = src[i]; | |
161 | src[i] = NULL; | |
162 | } | |
163 | } | |
164 | ||
165 | end: | |
166 | return 0; | |
167 | } | |
168 | ||
1da177e4 LT |
169 | static struct xfrm_state_afinfo xfrm6_state_afinfo = { |
170 | .family = AF_INET6, | |
1da177e4 | 171 | .init_tempsel = __xfrm6_init_tempsel, |
58c949d1 MN |
172 | .tmpl_sort = __xfrm6_tmpl_sort, |
173 | .state_sort = __xfrm6_state_sort, | |
1da177e4 LT |
174 | }; |
175 | ||
176 | void __init xfrm6_state_init(void) | |
177 | { | |
178 | xfrm_state_register_afinfo(&xfrm6_state_afinfo); | |
179 | } | |
180 | ||
181 | void xfrm6_state_fini(void) | |
182 | { | |
183 | xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); | |
184 | } | |
185 |