blob: 97ab068e8ccc10be9d1ee27ec3b4a081322bb307 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090011 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 */
13
Herbert Xu66cdb3c2007-11-13 21:37:28 -080014#include <linux/err.h>
15#include <linux/kernel.h>
Herbert Xuaabc9762005-05-03 16:27:10 -070016#include <linux/netdevice.h>
17#include <net/addrconf.h>
Herbert Xu45ff5a32007-11-13 21:35:32 -080018#include <net/dst.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/xfrm.h>
20#include <net/ip.h>
21#include <net/ipv6.h>
22#include <net/ip6_route.h>
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -070023#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -070024#include <net/mip6.h>
25#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27static struct dst_ops xfrm6_dst_ops;
28static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
29
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080030static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
31 xfrm_address_t *saddr,
Herbert Xu66cdb3c2007-11-13 21:37:28 -080032 xfrm_address_t *daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080034 struct flowi fl = {};
35 struct dst_entry *dst;
36 int err;
37
38 memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
39 if (saddr)
40 memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
41
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080042 dst = ip6_route_output(net, NULL, &fl);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080043
44 err = dst->error;
45 if (dst->error) {
Ville Nuorvala42513202006-10-16 22:10:05 -070046 dst_release(dst);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080047 dst = ERR_PTR(err);
48 }
49
50 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051}
52
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -080053static int xfrm6_get_saddr(struct net *net,
54 xfrm_address_t *saddr, xfrm_address_t *daddr)
Patrick McHardya1e59ab2006-09-19 12:57:34 -070055{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080056 struct dst_entry *dst;
Brian Haley191cd582008-08-14 15:33:21 -070057 struct net_device *dev;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070058
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -080059 dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080060 if (IS_ERR(dst))
61 return -EHOSTUNREACH;
62
Brian Haley191cd582008-08-14 15:33:21 -070063 dev = ip6_dst_idev(dst)->dev;
64 ipv6_dev_get_saddr(dev_net(dev), dev,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090065 (struct in6_addr *)&daddr->a6, 0,
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +090066 (struct in6_addr *)&saddr->a6);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080067 dst_release(dst);
68 return 0;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070069}
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071static struct dst_entry *
72__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
73{
74 struct dst_entry *dst;
75
76 /* Still not clear if we should set fl->fl6_{src,dst}... */
77 read_lock_bh(&policy->lock);
78 for (dst = policy->bundles; dst; dst = dst->next) {
79 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
80 struct in6_addr fl_dst_prefix, fl_src_prefix;
81
82 ipv6_addr_prefix(&fl_dst_prefix,
83 &fl->fl6_dst,
84 xdst->u.rt6.rt6i_dst.plen);
85 ipv6_addr_prefix(&fl_src_prefix,
86 &fl->fl6_src,
87 xdst->u.rt6.rt6i_src.plen);
88 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
89 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
Venkat Yekkirala5b368e62006-10-05 15:42:18 -050090 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -070091 (xdst->u.rt6.rt6i_dst.plen != 128 ||
92 xdst->u.rt6.rt6i_src.plen != 128))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 dst_clone(dst);
94 break;
95 }
96 }
97 read_unlock_bh(&policy->lock);
98 return dst;
99}
100
Herbert Xu25ee3282007-12-11 09:32:34 -0800101static int xfrm6_get_tos(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return 0;
Herbert Xu25ee3282007-12-11 09:32:34 -0800104}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800106static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
107 int nfheader_len)
108{
109 if (dst->ops->family == AF_INET6) {
110 struct rt6_info *rt = (struct rt6_info*)dst;
111 if (rt->rt6i_node)
112 path->path_cookie = rt->rt6i_node->fn_sernum;
113 }
114
115 path->u.rt6.rt6i_nfheader_len = nfheader_len;
116
117 return 0;
118}
119
Herbert Xu25ee3282007-12-11 09:32:34 -0800120static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
121{
122 struct rt6_info *rt = (struct rt6_info*)xdst->route;
123
124 xdst->u.dst.dev = dev;
125 dev_hold(dev);
126
127 xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
128 if (!xdst->u.rt6.rt6i_idev)
129 return -ENODEV;
130
131 /* Sheit... I remember I did this right. Apparently,
132 * it was magically lost, so this code needs audit */
133 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
134 RTF_LOCAL);
135 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
136 xdst->u.rt6.rt6i_node = rt->rt6i_node;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800137 if (rt->rt6i_node)
138 xdst->route_cookie = rt->rt6i_node->fn_sernum;
Herbert Xu25ee3282007-12-11 09:32:34 -0800139 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
140 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
141 xdst->u.rt6.rt6i_src = rt->rt6i_src;
142
143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
146static inline void
Herbert Xud5422ef2007-12-12 10:44:16 -0800147_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700149 int onlyproto = 0;
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300150 u16 offset = skb_network_header_len(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700151 struct ipv6hdr *hdr = ipv6_hdr(skb);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700152 struct ipv6_opt_hdr *exthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700153 const unsigned char *nh = skb_network_header(skb);
154 u8 nexthdr = nh[IP6CB(skb)->nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 memset(fl, 0, sizeof(struct flowi));
Herbert Xud5422ef2007-12-12 10:44:16 -0800157 ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
158 ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700160 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
161 nh = skb_network_header(skb);
162 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 switch (nexthdr) {
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700165 case NEXTHDR_FRAGMENT:
166 onlyproto = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 case NEXTHDR_ROUTING:
168 case NEXTHDR_HOP:
169 case NEXTHDR_DEST:
170 offset += ipv6_optlen(exthdr);
171 nexthdr = exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700172 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 break;
174
175 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800176 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 case IPPROTO_TCP:
178 case IPPROTO_SCTP:
Patrick McHardy9e999992005-12-19 14:03:46 -0800179 case IPPROTO_DCCP:
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700180 if (!onlyproto && pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
Al Viro8c689a62006-11-08 00:20:21 -0800181 __be16 *ports = (__be16 *)exthdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Herbert Xud5422ef2007-12-12 10:44:16 -0800183 fl->fl_ip_sport = ports[!!reverse];
184 fl->fl_ip_dport = ports[!reverse];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 fl->proto = nexthdr;
187 return;
188
189 case IPPROTO_ICMPV6:
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700190 if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 u8 *icmp = (u8 *)exthdr;
192
193 fl->fl_icmp_type = icmp[0];
194 fl->fl_icmp_code = icmp[1];
195 }
196 fl->proto = nexthdr;
197 return;
198
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700199#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700200 case IPPROTO_MH:
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700201 if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700202 struct ip6_mh *mh;
203 mh = (struct ip6_mh *)exthdr;
204
205 fl->fl_mh_type = mh->ip6mh_type;
206 }
207 fl->proto = nexthdr;
208 return;
209#endif
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* XXX Why are there these headers? */
212 case IPPROTO_AH:
213 case IPPROTO_ESP:
214 case IPPROTO_COMP:
215 default:
216 fl->fl_ipsec_spi = 0;
217 fl->proto = nexthdr;
218 return;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700219 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
221}
222
Daniel Lezcano569d3642008-01-18 03:56:57 -0800223static inline int xfrm6_garbage_collect(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Alexey Dobriyanddcfd792008-11-25 17:37:23 -0800225 xfrm6_policy_afinfo.garbage_collect(&init_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
227}
228
229static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
230{
231 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
232 struct dst_entry *path = xdst->route;
233
234 path->ops->update_pmtu(path, mtu);
235}
236
Herbert Xuaabc9762005-05-03 16:27:10 -0700237static void xfrm6_dst_destroy(struct dst_entry *dst)
238{
239 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
240
241 if (likely(xdst->u.rt6.rt6i_idev))
242 in6_dev_put(xdst->u.rt6.rt6i_idev);
243 xfrm_dst_destroy(xdst);
244}
245
246static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
247 int unregister)
248{
249 struct xfrm_dst *xdst;
250
251 if (!unregister)
252 return;
253
254 xdst = (struct xfrm_dst *)dst;
255 if (xdst->u.rt6.rt6i_idev->dev == dev) {
Denis V. Lunev5a3e55d2007-12-07 00:38:10 -0800256 struct inet6_dev *loopback_idev =
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900257 in6_dev_get(dev_net(dev)->loopback_dev);
Herbert Xuaabc9762005-05-03 16:27:10 -0700258 BUG_ON(!loopback_idev);
259
260 do {
261 in6_dev_put(xdst->u.rt6.rt6i_idev);
262 xdst->u.rt6.rt6i_idev = loopback_idev;
263 in6_dev_hold(loopback_idev);
264 xdst = (struct xfrm_dst *)xdst->u.dst.child;
265 } while (xdst->u.dst.xfrm);
266
267 __in6_dev_put(loopback_idev);
268 }
269
270 xfrm_dst_ifdown(dst, dev);
271}
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273static struct dst_ops xfrm6_dst_ops = {
274 .family = AF_INET6,
275 .protocol = __constant_htons(ETH_P_IPV6),
276 .gc = xfrm6_garbage_collect,
277 .update_pmtu = xfrm6_update_pmtu,
Herbert Xuaabc9762005-05-03 16:27:10 -0700278 .destroy = xfrm6_dst_destroy,
279 .ifdown = xfrm6_dst_ifdown,
Herbert Xu862b82c2007-11-13 21:43:11 -0800280 .local_out = __ip6_local_out,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 .gc_thresh = 1024,
Eric Dumazete2422972008-01-30 20:07:45 -0800282 .entries = ATOMIC_INIT(0),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283};
284
285static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
286 .family = AF_INET6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 .dst_ops = &xfrm6_dst_ops,
288 .dst_lookup = xfrm6_dst_lookup,
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700289 .get_saddr = xfrm6_get_saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 .find_bundle = __xfrm6_find_bundle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 .decode_session = _decode_session6,
Herbert Xu25ee3282007-12-11 09:32:34 -0800292 .get_tos = xfrm6_get_tos,
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800293 .init_path = xfrm6_init_path,
Herbert Xu25ee3282007-12-11 09:32:34 -0800294 .fill_dst = xfrm6_fill_dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295};
296
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800297static int __init xfrm6_policy_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800299 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302static void xfrm6_policy_fini(void)
303{
304 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
305}
306
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800307int __init xfrm6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800309 int ret;
310
311 ret = xfrm6_policy_init();
312 if (ret)
313 goto out;
314
315 ret = xfrm6_state_init();
316 if (ret)
317 goto out_policy;
318out:
319 return ret;
320out_policy:
321 xfrm6_policy_fini();
322 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
325void xfrm6_fini(void)
326{
327 //xfrm6_input_fini();
328 xfrm6_policy_fini();
329 xfrm6_state_fini();
330}