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 | ||
41 | dst = ip6_route_output(NULL, &fl); | |
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 | ||
60 | ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6, | |
61 | (struct in6_addr *)&saddr->a6); | |
62 | dst_release(dst); | |
63 | return 0; | |
a1e59abf PM |
64 | } |
65 | ||
1da177e4 LT |
66 | static struct dst_entry * |
67 | __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy) | |
68 | { | |
69 | struct dst_entry *dst; | |
70 | ||
71 | /* Still not clear if we should set fl->fl6_{src,dst}... */ | |
72 | read_lock_bh(&policy->lock); | |
73 | for (dst = policy->bundles; dst; dst = dst->next) { | |
74 | struct xfrm_dst *xdst = (struct xfrm_dst*)dst; | |
75 | struct in6_addr fl_dst_prefix, fl_src_prefix; | |
76 | ||
77 | ipv6_addr_prefix(&fl_dst_prefix, | |
78 | &fl->fl6_dst, | |
79 | xdst->u.rt6.rt6i_dst.plen); | |
80 | ipv6_addr_prefix(&fl_src_prefix, | |
81 | &fl->fl6_src, | |
82 | xdst->u.rt6.rt6i_src.plen); | |
83 | if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) && | |
84 | ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) && | |
5b368e61 | 85 | xfrm_bundle_ok(policy, xdst, fl, AF_INET6, |
e53820de MN |
86 | (xdst->u.rt6.rt6i_dst.plen != 128 || |
87 | xdst->u.rt6.rt6i_src.plen != 128))) { | |
1da177e4 LT |
88 | dst_clone(dst); |
89 | break; | |
90 | } | |
91 | } | |
92 | read_unlock_bh(&policy->lock); | |
93 | return dst; | |
94 | } | |
95 | ||
25ee3286 | 96 | static int xfrm6_get_tos(struct flowi *fl) |
1da177e4 | 97 | { |
25ee3286 HX |
98 | return 0; |
99 | } | |
1da177e4 | 100 | |
25ee3286 HX |
101 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
102 | { | |
103 | struct rt6_info *rt = (struct rt6_info*)xdst->route; | |
1da177e4 | 104 | |
25ee3286 HX |
105 | xdst->u.dst.dev = dev; |
106 | dev_hold(dev); | |
1da177e4 | 107 | |
25ee3286 HX |
108 | xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev); |
109 | if (!xdst->u.rt6.rt6i_idev) | |
110 | return -ENODEV; | |
1da177e4 | 111 | |
25ee3286 HX |
112 | /* Sheit... I remember I did this right. Apparently, |
113 | * it was magically lost, so this code needs audit */ | |
114 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
115 | RTF_LOCAL); | |
116 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
117 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
118 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; | |
119 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
120 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 121 | |
1da177e4 | 122 | return 0; |
1da177e4 LT |
123 | } |
124 | ||
125 | static inline void | |
126 | _decode_session6(struct sk_buff *skb, struct flowi *fl) | |
127 | { | |
cfe1fc77 | 128 | u16 offset = skb_network_header_len(skb); |
0660e03f | 129 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
e3cae904 | 130 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 ACM |
131 | const unsigned char *nh = skb_network_header(skb); |
132 | u8 nexthdr = nh[IP6CB(skb)->nhoff]; | |
1da177e4 LT |
133 | |
134 | memset(fl, 0, sizeof(struct flowi)); | |
135 | ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr); | |
136 | ipv6_addr_copy(&fl->fl6_src, &hdr->saddr); | |
137 | ||
d56f90a7 ACM |
138 | while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) { |
139 | nh = skb_network_header(skb); | |
140 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 141 | |
1da177e4 LT |
142 | switch (nexthdr) { |
143 | case NEXTHDR_ROUTING: | |
144 | case NEXTHDR_HOP: | |
145 | case NEXTHDR_DEST: | |
146 | offset += ipv6_optlen(exthdr); | |
147 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 148 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
149 | break; |
150 | ||
151 | case IPPROTO_UDP: | |
ba4e58ec | 152 | case IPPROTO_UDPLITE: |
1da177e4 LT |
153 | case IPPROTO_TCP: |
154 | case IPPROTO_SCTP: | |
9e999993 | 155 | case IPPROTO_DCCP: |
d56f90a7 | 156 | if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) { |
8c689a6e | 157 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 LT |
158 | |
159 | fl->fl_ip_sport = ports[0]; | |
160 | fl->fl_ip_dport = ports[1]; | |
161 | } | |
162 | fl->proto = nexthdr; | |
163 | return; | |
164 | ||
165 | case IPPROTO_ICMPV6: | |
d56f90a7 | 166 | if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
1da177e4 LT |
167 | u8 *icmp = (u8 *)exthdr; |
168 | ||
169 | fl->fl_icmp_type = icmp[0]; | |
170 | fl->fl_icmp_code = icmp[1]; | |
171 | } | |
172 | fl->proto = nexthdr; | |
173 | return; | |
174 | ||
59fbb3a6 | 175 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
2ce4272a | 176 | case IPPROTO_MH: |
d56f90a7 | 177 | if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a MN |
178 | struct ip6_mh *mh; |
179 | mh = (struct ip6_mh *)exthdr; | |
180 | ||
181 | fl->fl_mh_type = mh->ip6mh_type; | |
182 | } | |
183 | fl->proto = nexthdr; | |
184 | return; | |
185 | #endif | |
186 | ||
1da177e4 LT |
187 | /* XXX Why are there these headers? */ |
188 | case IPPROTO_AH: | |
189 | case IPPROTO_ESP: | |
190 | case IPPROTO_COMP: | |
191 | default: | |
192 | fl->fl_ipsec_spi = 0; | |
193 | fl->proto = nexthdr; | |
194 | return; | |
3ff50b79 | 195 | } |
1da177e4 LT |
196 | } |
197 | } | |
198 | ||
199 | static inline int xfrm6_garbage_collect(void) | |
200 | { | |
1da177e4 | 201 | xfrm6_policy_afinfo.garbage_collect(); |
1da177e4 LT |
202 | return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2); |
203 | } | |
204 | ||
205 | static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu) | |
206 | { | |
207 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
208 | struct dst_entry *path = xdst->route; | |
209 | ||
210 | path->ops->update_pmtu(path, mtu); | |
211 | } | |
212 | ||
aabc9761 HX |
213 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
214 | { | |
215 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
216 | ||
217 | if (likely(xdst->u.rt6.rt6i_idev)) | |
218 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
219 | xfrm_dst_destroy(xdst); | |
220 | } | |
221 | ||
222 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
223 | int unregister) | |
224 | { | |
225 | struct xfrm_dst *xdst; | |
226 | ||
227 | if (!unregister) | |
228 | return; | |
229 | ||
230 | xdst = (struct xfrm_dst *)dst; | |
231 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
2774c7ab | 232 | struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev); |
aabc9761 HX |
233 | BUG_ON(!loopback_idev); |
234 | ||
235 | do { | |
236 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
237 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
238 | in6_dev_hold(loopback_idev); | |
239 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
240 | } while (xdst->u.dst.xfrm); | |
241 | ||
242 | __in6_dev_put(loopback_idev); | |
243 | } | |
244 | ||
245 | xfrm_dst_ifdown(dst, dev); | |
246 | } | |
247 | ||
1da177e4 LT |
248 | static struct dst_ops xfrm6_dst_ops = { |
249 | .family = AF_INET6, | |
250 | .protocol = __constant_htons(ETH_P_IPV6), | |
251 | .gc = xfrm6_garbage_collect, | |
252 | .update_pmtu = xfrm6_update_pmtu, | |
aabc9761 HX |
253 | .destroy = xfrm6_dst_destroy, |
254 | .ifdown = xfrm6_dst_ifdown, | |
1da177e4 LT |
255 | .gc_thresh = 1024, |
256 | .entry_size = sizeof(struct xfrm_dst), | |
257 | }; | |
258 | ||
259 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
260 | .family = AF_INET6, | |
1da177e4 LT |
261 | .dst_ops = &xfrm6_dst_ops, |
262 | .dst_lookup = xfrm6_dst_lookup, | |
a1e59abf | 263 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 264 | .find_bundle = __xfrm6_find_bundle, |
1da177e4 | 265 | .decode_session = _decode_session6, |
25ee3286 HX |
266 | .get_tos = xfrm6_get_tos, |
267 | .fill_dst = xfrm6_fill_dst, | |
1da177e4 LT |
268 | }; |
269 | ||
270 | static void __init xfrm6_policy_init(void) | |
271 | { | |
272 | xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); | |
273 | } | |
274 | ||
275 | static void xfrm6_policy_fini(void) | |
276 | { | |
277 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
278 | } | |
279 | ||
280 | void __init xfrm6_init(void) | |
281 | { | |
282 | xfrm6_policy_init(); | |
283 | xfrm6_state_init(); | |
284 | } | |
285 | ||
286 | void xfrm6_fini(void) | |
287 | { | |
288 | //xfrm6_input_fini(); | |
289 | xfrm6_policy_fini(); | |
290 | xfrm6_state_fini(); | |
291 | } |