Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm6_policy.c: based on xfrm4_policy.c | |
3 | * | |
4 | * Authors: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki | |
10 | * Split up af-specific portion | |
1ab1457c | 11 | * |
1da177e4 LT |
12 | */ |
13 | ||
66cdb3ca HX |
14 | #include <linux/err.h> |
15 | #include <linux/kernel.h> | |
aabc9761 HX |
16 | #include <linux/netdevice.h> |
17 | #include <net/addrconf.h> | |
45ff5a3f | 18 | #include <net/dst.h> |
1da177e4 LT |
19 | #include <net/xfrm.h> |
20 | #include <net/ip.h> | |
21 | #include <net/ipv6.h> | |
22 | #include <net/ip6_route.h> | |
59fbb3a6 | 23 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
2ce4272a MN |
24 | #include <net/mip6.h> |
25 | #endif | |
1da177e4 LT |
26 | |
27 | static struct dst_ops xfrm6_dst_ops; | |
28 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo; | |
29 | ||
66cdb3ca HX |
30 | static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr, |
31 | xfrm_address_t *daddr) | |
1da177e4 | 32 | { |
66cdb3ca HX |
33 | struct flowi fl = {}; |
34 | struct dst_entry *dst; | |
35 | int err; | |
36 | ||
37 | memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst)); | |
38 | if (saddr) | |
39 | memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src)); | |
40 | ||
4591db4f | 41 | dst = ip6_route_output(&init_net, NULL, &fl); |
66cdb3ca HX |
42 | |
43 | err = dst->error; | |
44 | if (dst->error) { | |
4251320f | 45 | dst_release(dst); |
66cdb3ca HX |
46 | dst = ERR_PTR(err); |
47 | } | |
48 | ||
49 | return dst; | |
1da177e4 LT |
50 | } |
51 | ||
a1e59abf PM |
52 | static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr) |
53 | { | |
66cdb3ca HX |
54 | struct dst_entry *dst; |
55 | ||
56 | dst = xfrm6_dst_lookup(0, NULL, daddr); | |
57 | if (IS_ERR(dst)) | |
58 | return -EHOSTUNREACH; | |
59 | ||
5e5f3f0f | 60 | ipv6_dev_get_saddr(ip6_dst_idev(dst)->dev, |
7cbca67c | 61 | (struct in6_addr *)&daddr->a6, 0, |
5e5f3f0f | 62 | (struct in6_addr *)&saddr->a6); |
66cdb3ca HX |
63 | dst_release(dst); |
64 | return 0; | |
a1e59abf PM |
65 | } |
66 | ||
1da177e4 LT |
67 | static struct dst_entry * |
68 | __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy) | |
69 | { | |
70 | struct dst_entry *dst; | |
71 | ||
72 | /* Still not clear if we should set fl->fl6_{src,dst}... */ | |
73 | read_lock_bh(&policy->lock); | |
74 | for (dst = policy->bundles; dst; dst = dst->next) { | |
75 | struct xfrm_dst *xdst = (struct xfrm_dst*)dst; | |
76 | struct in6_addr fl_dst_prefix, fl_src_prefix; | |
77 | ||
78 | ipv6_addr_prefix(&fl_dst_prefix, | |
79 | &fl->fl6_dst, | |
80 | xdst->u.rt6.rt6i_dst.plen); | |
81 | ipv6_addr_prefix(&fl_src_prefix, | |
82 | &fl->fl6_src, | |
83 | xdst->u.rt6.rt6i_src.plen); | |
84 | if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) && | |
85 | ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) && | |
5b368e61 | 86 | xfrm_bundle_ok(policy, xdst, fl, AF_INET6, |
e53820de MN |
87 | (xdst->u.rt6.rt6i_dst.plen != 128 || |
88 | xdst->u.rt6.rt6i_src.plen != 128))) { | |
1da177e4 LT |
89 | dst_clone(dst); |
90 | break; | |
91 | } | |
92 | } | |
93 | read_unlock_bh(&policy->lock); | |
94 | return dst; | |
95 | } | |
96 | ||
25ee3286 | 97 | static int xfrm6_get_tos(struct flowi *fl) |
1da177e4 | 98 | { |
25ee3286 HX |
99 | return 0; |
100 | } | |
1da177e4 | 101 | |
a1b05140 MN |
102 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
103 | int nfheader_len) | |
104 | { | |
105 | if (dst->ops->family == AF_INET6) { | |
106 | struct rt6_info *rt = (struct rt6_info*)dst; | |
107 | if (rt->rt6i_node) | |
108 | path->path_cookie = rt->rt6i_node->fn_sernum; | |
109 | } | |
110 | ||
111 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
25ee3286 HX |
116 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
117 | { | |
118 | struct rt6_info *rt = (struct rt6_info*)xdst->route; | |
1da177e4 | 119 | |
25ee3286 HX |
120 | xdst->u.dst.dev = dev; |
121 | dev_hold(dev); | |
1da177e4 | 122 | |
25ee3286 HX |
123 | xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev); |
124 | if (!xdst->u.rt6.rt6i_idev) | |
125 | return -ENODEV; | |
1da177e4 | 126 | |
25ee3286 HX |
127 | /* Sheit... I remember I did this right. Apparently, |
128 | * it was magically lost, so this code needs audit */ | |
129 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
130 | RTF_LOCAL); | |
131 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
132 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
a1b05140 MN |
133 | if (rt->rt6i_node) |
134 | xdst->route_cookie = rt->rt6i_node->fn_sernum; | |
25ee3286 HX |
135 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
136 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
137 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 138 | |
1da177e4 | 139 | return 0; |
1da177e4 LT |
140 | } |
141 | ||
142 | static inline void | |
d5422efe | 143 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 144 | { |
cfe1fc77 | 145 | u16 offset = skb_network_header_len(skb); |
0660e03f | 146 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e3cae904 | 147 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 ACM |
148 | const unsigned char *nh = skb_network_header(skb); |
149 | u8 nexthdr = nh[IP6CB(skb)->nhoff]; | |
1da177e4 LT |
150 | |
151 | memset(fl, 0, sizeof(struct flowi)); | |
d5422efe HX |
152 | ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr); |
153 | ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr); | |
1da177e4 | 154 | |
d56f90a7 ACM |
155 | while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) { |
156 | nh = skb_network_header(skb); | |
157 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 158 | |
1da177e4 LT |
159 | switch (nexthdr) { |
160 | case NEXTHDR_ROUTING: | |
161 | case NEXTHDR_HOP: | |
162 | case NEXTHDR_DEST: | |
163 | offset += ipv6_optlen(exthdr); | |
164 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 165 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
166 | break; |
167 | ||
168 | case IPPROTO_UDP: | |
ba4e58ec | 169 | case IPPROTO_UDPLITE: |
1da177e4 LT |
170 | case IPPROTO_TCP: |
171 | case IPPROTO_SCTP: | |
9e999993 | 172 | case IPPROTO_DCCP: |
d56f90a7 | 173 | if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) { |
8c689a6e | 174 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 | 175 | |
d5422efe HX |
176 | fl->fl_ip_sport = ports[!!reverse]; |
177 | fl->fl_ip_dport = ports[!reverse]; | |
1da177e4 LT |
178 | } |
179 | fl->proto = nexthdr; | |
180 | return; | |
181 | ||
182 | case IPPROTO_ICMPV6: | |
d56f90a7 | 183 | if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
1da177e4 LT |
184 | u8 *icmp = (u8 *)exthdr; |
185 | ||
186 | fl->fl_icmp_type = icmp[0]; | |
187 | fl->fl_icmp_code = icmp[1]; | |
188 | } | |
189 | fl->proto = nexthdr; | |
190 | return; | |
191 | ||
59fbb3a6 | 192 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
2ce4272a | 193 | case IPPROTO_MH: |
d56f90a7 | 194 | if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a MN |
195 | struct ip6_mh *mh; |
196 | mh = (struct ip6_mh *)exthdr; | |
197 | ||
198 | fl->fl_mh_type = mh->ip6mh_type; | |
199 | } | |
200 | fl->proto = nexthdr; | |
201 | return; | |
202 | #endif | |
203 | ||
1da177e4 LT |
204 | /* XXX Why are there these headers? */ |
205 | case IPPROTO_AH: | |
206 | case IPPROTO_ESP: | |
207 | case IPPROTO_COMP: | |
208 | default: | |
209 | fl->fl_ipsec_spi = 0; | |
210 | fl->proto = nexthdr; | |
211 | return; | |
3ff50b79 | 212 | } |
1da177e4 LT |
213 | } |
214 | } | |
215 | ||
569d3645 | 216 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 217 | { |
1da177e4 | 218 | xfrm6_policy_afinfo.garbage_collect(); |
1da177e4 LT |
219 | return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2); |
220 | } | |
221 | ||
222 | static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu) | |
223 | { | |
224 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
225 | struct dst_entry *path = xdst->route; | |
226 | ||
227 | path->ops->update_pmtu(path, mtu); | |
228 | } | |
229 | ||
aabc9761 HX |
230 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
231 | { | |
232 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
233 | ||
234 | if (likely(xdst->u.rt6.rt6i_idev)) | |
235 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
236 | xfrm_dst_destroy(xdst); | |
237 | } | |
238 | ||
239 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
240 | int unregister) | |
241 | { | |
242 | struct xfrm_dst *xdst; | |
243 | ||
244 | if (!unregister) | |
245 | return; | |
246 | ||
247 | xdst = (struct xfrm_dst *)dst; | |
248 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 249 | struct inet6_dev *loopback_idev = |
c346dca1 | 250 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
251 | BUG_ON(!loopback_idev); |
252 | ||
253 | do { | |
254 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
255 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
256 | in6_dev_hold(loopback_idev); | |
257 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
258 | } while (xdst->u.dst.xfrm); | |
259 | ||
260 | __in6_dev_put(loopback_idev); | |
261 | } | |
262 | ||
263 | xfrm_dst_ifdown(dst, dev); | |
264 | } | |
265 | ||
1da177e4 LT |
266 | static struct dst_ops xfrm6_dst_ops = { |
267 | .family = AF_INET6, | |
268 | .protocol = __constant_htons(ETH_P_IPV6), | |
269 | .gc = xfrm6_garbage_collect, | |
270 | .update_pmtu = xfrm6_update_pmtu, | |
aabc9761 HX |
271 | .destroy = xfrm6_dst_destroy, |
272 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 273 | .local_out = __ip6_local_out, |
1da177e4 LT |
274 | .gc_thresh = 1024, |
275 | .entry_size = sizeof(struct xfrm_dst), | |
e2422970 | 276 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
277 | }; |
278 | ||
279 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
280 | .family = AF_INET6, | |
1da177e4 LT |
281 | .dst_ops = &xfrm6_dst_ops, |
282 | .dst_lookup = xfrm6_dst_lookup, | |
a1e59abf | 283 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 284 | .find_bundle = __xfrm6_find_bundle, |
1da177e4 | 285 | .decode_session = _decode_session6, |
25ee3286 | 286 | .get_tos = xfrm6_get_tos, |
a1b05140 | 287 | .init_path = xfrm6_init_path, |
25ee3286 | 288 | .fill_dst = xfrm6_fill_dst, |
1da177e4 LT |
289 | }; |
290 | ||
0013caba | 291 | static int __init xfrm6_policy_init(void) |
1da177e4 | 292 | { |
0013caba | 293 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
294 | } |
295 | ||
296 | static void xfrm6_policy_fini(void) | |
297 | { | |
298 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
299 | } | |
300 | ||
0013caba | 301 | int __init xfrm6_init(void) |
1da177e4 | 302 | { |
0013caba DL |
303 | int ret; |
304 | ||
305 | ret = xfrm6_policy_init(); | |
306 | if (ret) | |
307 | goto out; | |
308 | ||
309 | ret = xfrm6_state_init(); | |
310 | if (ret) | |
311 | goto out_policy; | |
312 | out: | |
313 | return ret; | |
314 | out_policy: | |
315 | xfrm6_policy_fini(); | |
316 | goto out; | |
1da177e4 LT |
317 | } |
318 | ||
319 | void xfrm6_fini(void) | |
320 | { | |
321 | //xfrm6_input_fini(); | |
322 | xfrm6_policy_fini(); | |
323 | xfrm6_state_fini(); | |
324 | } |