blob: da87428681cccc9d955fdc80ee6f8bd4998356dd [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
28
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080029static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
30 xfrm_address_t *saddr,
Herbert Xu66cdb3c2007-11-13 21:37:28 -080031 xfrm_address_t *daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080033 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
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080041 dst = ip6_route_output(net, NULL, &fl);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080042
43 err = dst->error;
44 if (dst->error) {
Ville Nuorvala42513202006-10-16 22:10:05 -070045 dst_release(dst);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080046 dst = ERR_PTR(err);
47 }
48
49 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050}
51
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -080052static int xfrm6_get_saddr(struct net *net,
53 xfrm_address_t *saddr, xfrm_address_t *daddr)
Patrick McHardya1e59ab2006-09-19 12:57:34 -070054{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080055 struct dst_entry *dst;
Brian Haley191cd582008-08-14 15:33:21 -070056 struct net_device *dev;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070057
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -080058 dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080059 if (IS_ERR(dst))
60 return -EHOSTUNREACH;
61
Brian Haley191cd582008-08-14 15:33:21 -070062 dev = ip6_dst_idev(dst)->dev;
63 ipv6_dev_get_saddr(dev_net(dev), dev,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090064 (struct in6_addr *)&daddr->a6, 0,
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +090065 (struct in6_addr *)&saddr->a6);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080066 dst_release(dst);
67 return 0;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070068}
69
Herbert Xu25ee3282007-12-11 09:32:34 -080070static int xfrm6_get_tos(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return 0;
Herbert Xu25ee3282007-12-11 09:32:34 -080073}
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -080075static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
76 int nfheader_len)
77{
78 if (dst->ops->family == AF_INET6) {
79 struct rt6_info *rt = (struct rt6_info*)dst;
80 if (rt->rt6i_node)
81 path->path_cookie = rt->rt6i_node->fn_sernum;
82 }
83
84 path->u.rt6.rt6i_nfheader_len = nfheader_len;
85
86 return 0;
87}
88
Herbert Xu87c1e122010-03-02 02:51:56 +000089static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
90 struct flowi *fl)
Herbert Xu25ee3282007-12-11 09:32:34 -080091{
92 struct rt6_info *rt = (struct rt6_info*)xdst->route;
93
94 xdst->u.dst.dev = dev;
95 dev_hold(dev);
96
Nicolas Dichtelbc8e4b92010-04-21 16:25:30 -070097 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
Herbert Xu25ee3282007-12-11 09:32:34 -080098 if (!xdst->u.rt6.rt6i_idev)
99 return -ENODEV;
100
David S. Miller7cc2edb2011-01-26 13:41:03 -0800101 xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
102 if (rt->rt6i_peer)
103 atomic_inc(&rt->rt6i_peer->refcnt);
104
Herbert Xu25ee3282007-12-11 09:32:34 -0800105 /* Sheit... I remember I did this right. Apparently,
106 * it was magically lost, so this code needs audit */
107 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
108 RTF_LOCAL);
109 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
110 xdst->u.rt6.rt6i_node = rt->rt6i_node;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800111 if (rt->rt6i_node)
112 xdst->route_cookie = rt->rt6i_node->fn_sernum;
Herbert Xu25ee3282007-12-11 09:32:34 -0800113 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
114 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
115 xdst->u.rt6.rt6i_src = rt->rt6i_src;
116
117 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
120static inline void
Herbert Xud5422ef2007-12-12 10:44:16 -0800121_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700123 int onlyproto = 0;
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300124 u16 offset = skb_network_header_len(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700125 struct ipv6hdr *hdr = ipv6_hdr(skb);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700126 struct ipv6_opt_hdr *exthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700127 const unsigned char *nh = skb_network_header(skb);
128 u8 nexthdr = nh[IP6CB(skb)->nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 memset(fl, 0, sizeof(struct flowi));
Peter Kosyh44b451f2010-07-02 07:47:55 +0000131 fl->mark = skb->mark;
132
Herbert Xud5422ef2007-12-12 10:44:16 -0800133 ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
134 ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Wei Yongjun59cae002009-07-02 16:59:49 +0000136 while (nh + offset + 1 < skb->data ||
137 pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700138 nh = skb_network_header(skb);
139 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 switch (nexthdr) {
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700142 case NEXTHDR_FRAGMENT:
143 onlyproto = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 case NEXTHDR_ROUTING:
145 case NEXTHDR_HOP:
146 case NEXTHDR_DEST:
147 offset += ipv6_optlen(exthdr);
148 nexthdr = exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700149 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 break;
151
152 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800153 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 case IPPROTO_TCP:
155 case IPPROTO_SCTP:
Patrick McHardy9e999992005-12-19 14:03:46 -0800156 case IPPROTO_DCCP:
Wei Yongjun59cae002009-07-02 16:59:49 +0000157 if (!onlyproto && (nh + offset + 4 < skb->data ||
158 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
Al Viro8c689a62006-11-08 00:20:21 -0800159 __be16 *ports = (__be16 *)exthdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Herbert Xud5422ef2007-12-12 10:44:16 -0800161 fl->fl_ip_sport = ports[!!reverse];
162 fl->fl_ip_dport = ports[!reverse];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164 fl->proto = nexthdr;
165 return;
166
167 case IPPROTO_ICMPV6:
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700168 if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 u8 *icmp = (u8 *)exthdr;
170
171 fl->fl_icmp_type = icmp[0];
172 fl->fl_icmp_code = icmp[1];
173 }
174 fl->proto = nexthdr;
175 return;
176
Masahide NAKAMURA59fbb3a2007-06-26 23:56:32 -0700177#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700178 case IPPROTO_MH:
Nicolas Dichtel7e3a42a2008-11-01 21:12:07 -0700179 if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700180 struct ip6_mh *mh;
181 mh = (struct ip6_mh *)exthdr;
182
183 fl->fl_mh_type = mh->ip6mh_type;
184 }
185 fl->proto = nexthdr;
186 return;
187#endif
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 /* XXX Why are there these headers? */
190 case IPPROTO_AH:
191 case IPPROTO_ESP:
192 case IPPROTO_COMP:
193 default:
194 fl->fl_ipsec_spi = 0;
195 fl->proto = nexthdr;
196 return;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700197 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
199}
200
Daniel Lezcano569d3642008-01-18 03:56:57 -0800201static inline int xfrm6_garbage_collect(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Alexey Dobriyand7c75442010-01-24 22:47:53 -0800203 struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
204
205 xfrm6_policy_afinfo.garbage_collect(net);
Eric Dumazetfc66f952010-10-08 06:37:34 +0000206 return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
209static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
210{
211 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
212 struct dst_entry *path = xdst->route;
213
214 path->ops->update_pmtu(path, mtu);
215}
216
Herbert Xuaabc9762005-05-03 16:27:10 -0700217static void xfrm6_dst_destroy(struct dst_entry *dst)
218{
219 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
220
221 if (likely(xdst->u.rt6.rt6i_idev))
222 in6_dev_put(xdst->u.rt6.rt6i_idev);
David S. Miller7cc2edb2011-01-26 13:41:03 -0800223 if (likely(xdst->u.rt6.rt6i_peer))
224 inet_putpeer(xdst->u.rt6.rt6i_peer);
Herbert Xuaabc9762005-05-03 16:27:10 -0700225 xfrm_dst_destroy(xdst);
226}
227
228static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
229 int unregister)
230{
231 struct xfrm_dst *xdst;
232
233 if (!unregister)
234 return;
235
236 xdst = (struct xfrm_dst *)dst;
237 if (xdst->u.rt6.rt6i_idev->dev == dev) {
Denis V. Lunev5a3e55d2007-12-07 00:38:10 -0800238 struct inet6_dev *loopback_idev =
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900239 in6_dev_get(dev_net(dev)->loopback_dev);
Herbert Xuaabc9762005-05-03 16:27:10 -0700240 BUG_ON(!loopback_idev);
241
242 do {
243 in6_dev_put(xdst->u.rt6.rt6i_idev);
244 xdst->u.rt6.rt6i_idev = loopback_idev;
245 in6_dev_hold(loopback_idev);
246 xdst = (struct xfrm_dst *)xdst->u.dst.child;
247 } while (xdst->u.dst.xfrm);
248
249 __in6_dev_put(loopback_idev);
250 }
251
252 xfrm_dst_ifdown(dst, dev);
253}
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255static struct dst_ops xfrm6_dst_ops = {
256 .family = AF_INET6,
Harvey Harrison09640e62009-02-01 00:45:17 -0800257 .protocol = cpu_to_be16(ETH_P_IPV6),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 .gc = xfrm6_garbage_collect,
259 .update_pmtu = xfrm6_update_pmtu,
Herbert Xuaabc9762005-05-03 16:27:10 -0700260 .destroy = xfrm6_dst_destroy,
261 .ifdown = xfrm6_dst_ifdown,
Herbert Xu862b82c2007-11-13 21:43:11 -0800262 .local_out = __ip6_local_out,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 .gc_thresh = 1024,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264};
265
266static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
267 .family = AF_INET6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 .dst_ops = &xfrm6_dst_ops,
269 .dst_lookup = xfrm6_dst_lookup,
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700270 .get_saddr = xfrm6_get_saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 .decode_session = _decode_session6,
Herbert Xu25ee3282007-12-11 09:32:34 -0800272 .get_tos = xfrm6_get_tos,
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800273 .init_path = xfrm6_init_path,
Herbert Xu25ee3282007-12-11 09:32:34 -0800274 .fill_dst = xfrm6_fill_dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275};
276
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800277static int __init xfrm6_policy_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800279 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282static void xfrm6_policy_fini(void)
283{
284 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
285}
286
David S. Millerdb717892009-08-04 20:32:16 -0700287#ifdef CONFIG_SYSCTL
Neil Hormana44a4a02009-07-27 08:22:46 +0000288static struct ctl_table xfrm6_policy_table[] = {
289 {
Neil Hormana44a4a02009-07-27 08:22:46 +0000290 .procname = "xfrm6_gc_thresh",
Alexey Dobriyand7c75442010-01-24 22:47:53 -0800291 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
Neil Hormana44a4a02009-07-27 08:22:46 +0000292 .maxlen = sizeof(int),
293 .mode = 0644,
294 .proc_handler = proc_dointvec,
295 },
296 { }
297};
298
299static struct ctl_table_header *sysctl_hdr;
David S. Millerdb717892009-08-04 20:32:16 -0700300#endif
Neil Hormana44a4a02009-07-27 08:22:46 +0000301
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800302int __init xfrm6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800304 int ret;
Neil Hormana33bc5c2009-07-30 18:52:15 -0700305 unsigned int gc_thresh;
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800306
Neil Hormana33bc5c2009-07-30 18:52:15 -0700307 /*
308 * We need a good default value for the xfrm6 gc threshold.
309 * In ipv4 we set it to the route hash table size * 8, which
310 * is half the size of the maximaum route cache for ipv4. It
311 * would be good to do the same thing for v6, except the table is
312 * constructed differently here. Here each table for a net namespace
313 * can have FIB_TABLE_HASHSZ entries, so lets go with the same
314 * computation that we used for ipv4 here. Also, lets keep the initial
315 * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
316 * to that as a minimum as well
317 */
318 gc_thresh = FIB6_TABLE_HASHSZ * 8;
319 xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
Eric Dumazetfc66f952010-10-08 06:37:34 +0000320 dst_entries_init(&xfrm6_dst_ops);
Alexey Dobriyand7c75442010-01-24 22:47:53 -0800321
322 ret = xfrm6_policy_init();
Eric Dumazetfc66f952010-10-08 06:37:34 +0000323 if (ret) {
324 dst_entries_destroy(&xfrm6_dst_ops);
Alexey Dobriyand7c75442010-01-24 22:47:53 -0800325 goto out;
Eric Dumazetfc66f952010-10-08 06:37:34 +0000326 }
Alexey Dobriyand7c75442010-01-24 22:47:53 -0800327 ret = xfrm6_state_init();
328 if (ret)
329 goto out_policy;
330
David S. Millerdb717892009-08-04 20:32:16 -0700331#ifdef CONFIG_SYSCTL
Neil Hormana44a4a02009-07-27 08:22:46 +0000332 sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
333 xfrm6_policy_table);
David S. Millerdb717892009-08-04 20:32:16 -0700334#endif
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800335out:
336 return ret;
337out_policy:
338 xfrm6_policy_fini();
339 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340}
341
342void xfrm6_fini(void)
343{
David S. Millerdb717892009-08-04 20:32:16 -0700344#ifdef CONFIG_SYSCTL
Neil Hormana44a4a02009-07-27 08:22:46 +0000345 if (sysctl_hdr)
346 unregister_net_sysctl_table(sysctl_hdr);
David S. Millerdb717892009-08-04 20:32:16 -0700347#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 //xfrm6_input_fini();
349 xfrm6_policy_fini();
350 xfrm6_state_fini();
Eric Dumazetfc66f952010-10-08 06:37:34 +0000351 dst_entries_destroy(&xfrm6_dst_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}