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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 <linux/netfilter_ipv6.h> | |
18 | #include <net/dsfield.h> | |
19 | #include <net/ipv6.h> | |
20 | #include <net/addrconf.h> | |
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); | |
34 | x->sel.dport_mask = htons(0xffff); | |
35 | x->sel.sport = xfrm_flowi_sport(fl); | |
36 | x->sel.sport_mask = htons(0xffff); | |
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)); | |
47 | x->props.mode = tmpl->mode; | |
48 | x->props.reqid = tmpl->reqid; | |
49 | x->props.family = AF_INET6; | |
50 | } | |
51 | ||
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 | ||
69 | /* Rule 2: select MIPv6 RO or inbound trigger */ | |
70 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) | |
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 | |
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] && | |
98 | (src[i]->props.mode == XFRM_MODE_TUNNEL || | |
99 | src[i]->props.mode == XFRM_MODE_BEET)) { | |
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 | ||
135 | /* Rule 2: select MIPv6 RO or inbound trigger */ | |
136 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) | |
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 | |
148 | ||
149 | /* Rule 3: select IPsec tunnel */ | |
150 | for (i = 0; i < n; i++) { | |
151 | if (src[i] && | |
152 | (src[i]->mode == XFRM_MODE_TUNNEL || | |
153 | src[i]->mode == XFRM_MODE_BEET)) { | |
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 | ||
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; | |
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 | ||
187 | static struct xfrm_state_afinfo xfrm6_state_afinfo = { | |
188 | .family = AF_INET6, | |
189 | .proto = IPPROTO_IPV6, | |
190 | .eth_proto = htons(ETH_P_IPV6), | |
191 | .nf_post_routing = NF_INET_POST_ROUTING, | |
192 | .owner = THIS_MODULE, | |
193 | .init_tempsel = __xfrm6_init_tempsel, | |
194 | .tmpl_sort = __xfrm6_tmpl_sort, | |
195 | .state_sort = __xfrm6_state_sort, | |
196 | .output = xfrm6_output, | |
197 | .extract_input = xfrm6_extract_input, | |
198 | .extract_output = xfrm6_extract_output, | |
199 | .transport_finish = xfrm6_transport_finish, | |
200 | }; | |
201 | ||
202 | void __init xfrm6_state_init(void) | |
203 | { | |
204 | xfrm_state_register_afinfo(&xfrm6_state_afinfo); | |
205 | } | |
206 | ||
207 | void xfrm6_state_fini(void) | |
208 | { | |
209 | xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); | |
210 | } | |
211 |