blob: 8f1e0543b3c4f114539e288d12ac273c5fbe127d [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 NAKAMURA59fbb3a62007-06-26 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
Herbert Xu66cdb3c2007-11-13 21:37:28 -080030static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
31 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
Daniel Lezcano4591db42008-03-05 10:48:10 -080041 dst = ip6_route_output(&init_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
Patrick McHardya1e59ab2006-09-19 12:57:34 -070052static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
53{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080054 struct dst_entry *dst;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070055
Herbert Xu66cdb3c2007-11-13 21:37:28 -080056 dst = xfrm6_dst_lookup(0, NULL, daddr);
57 if (IS_ERR(dst))
58 return -EHOSTUNREACH;
59
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +090060 ipv6_dev_get_saddr(ip6_dst_idev(dst)->dev,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090061 (struct in6_addr *)&daddr->a6, 0,
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +090062 (struct in6_addr *)&saddr->a6);
Herbert Xu66cdb3c2007-11-13 21:37:28 -080063 dst_release(dst);
64 return 0;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070065}
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static 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) &&
Venkat Yekkirala5b368e62006-10-05 15:42:18 -050086 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -070087 (xdst->u.rt6.rt6i_dst.plen != 128 ||
88 xdst->u.rt6.rt6i_src.plen != 128))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 dst_clone(dst);
90 break;
91 }
92 }
93 read_unlock_bh(&policy->lock);
94 return dst;
95}
96
Herbert Xu25ee3282007-12-11 09:32:34 -080097static int xfrm6_get_tos(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 return 0;
Herbert Xu25ee3282007-12-11 09:32:34 -0800100}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800102static 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
Herbert Xu25ee3282007-12-11 09:32:34 -0800116static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
117{
118 struct rt6_info *rt = (struct rt6_info*)xdst->route;
119
120 xdst->u.dst.dev = dev;
121 dev_hold(dev);
122
123 xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
124 if (!xdst->u.rt6.rt6i_idev)
125 return -ENODEV;
126
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;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800133 if (rt->rt6i_node)
134 xdst->route_cookie = rt->rt6i_node->fn_sernum;
Herbert Xu25ee3282007-12-11 09:32:34 -0800135 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;
138
139 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142static inline void
Herbert Xud5422ef2007-12-12 10:44:16 -0800143_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300145 u16 offset = skb_network_header_len(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700146 struct ipv6hdr *hdr = ipv6_hdr(skb);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700147 struct ipv6_opt_hdr *exthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700148 const unsigned char *nh = skb_network_header(skb);
149 u8 nexthdr = nh[IP6CB(skb)->nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 memset(fl, 0, sizeof(struct flowi));
Herbert Xud5422ef2007-12-12 10:44:16 -0800152 ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
153 ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700155 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
156 nh = skb_network_header(skb);
157 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 switch (nexthdr) {
160 case NEXTHDR_ROUTING:
161 case NEXTHDR_HOP:
162 case NEXTHDR_DEST:
163 offset += ipv6_optlen(exthdr);
164 nexthdr = exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700165 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 break;
167
168 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800169 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 case IPPROTO_TCP:
171 case IPPROTO_SCTP:
Patrick McHardy9e999992005-12-19 14:03:46 -0800172 case IPPROTO_DCCP:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700173 if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
Al Viro8c689a62006-11-08 00:20:21 -0800174 __be16 *ports = (__be16 *)exthdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Herbert Xud5422ef2007-12-12 10:44:16 -0800176 fl->fl_ip_sport = ports[!!reverse];
177 fl->fl_ip_dport = ports[!reverse];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179 fl->proto = nexthdr;
180 return;
181
182 case IPPROTO_ICMPV6:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700183 if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 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
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700192#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700193 case IPPROTO_MH:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700194 if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700195 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /* 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;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700212 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214}
215
Daniel Lezcano569d3642008-01-18 03:56:57 -0800216static inline int xfrm6_garbage_collect(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 xfrm6_policy_afinfo.garbage_collect();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
220}
221
222static 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
Herbert Xuaabc9762005-05-03 16:27:10 -0700230static 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
239static 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) {
Denis V. Lunev5a3e55d2007-12-07 00:38:10 -0800249 struct inet6_dev *loopback_idev =
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900250 in6_dev_get(dev_net(dev)->loopback_dev);
Herbert Xuaabc9762005-05-03 16:27:10 -0700251 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266static 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,
Herbert Xuaabc9762005-05-03 16:27:10 -0700271 .destroy = xfrm6_dst_destroy,
272 .ifdown = xfrm6_dst_ifdown,
Herbert Xu862b82c2007-11-13 21:43:11 -0800273 .local_out = __ip6_local_out,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 .gc_thresh = 1024,
275 .entry_size = sizeof(struct xfrm_dst),
Eric Dumazete2422972008-01-30 20:07:45 -0800276 .entries = ATOMIC_INIT(0),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277};
278
279static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
280 .family = AF_INET6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 .dst_ops = &xfrm6_dst_ops,
282 .dst_lookup = xfrm6_dst_lookup,
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700283 .get_saddr = xfrm6_get_saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 .find_bundle = __xfrm6_find_bundle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 .decode_session = _decode_session6,
Herbert Xu25ee3282007-12-11 09:32:34 -0800286 .get_tos = xfrm6_get_tos,
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800287 .init_path = xfrm6_init_path,
Herbert Xu25ee3282007-12-11 09:32:34 -0800288 .fill_dst = xfrm6_fill_dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289};
290
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800291static int __init xfrm6_policy_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800293 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
296static void xfrm6_policy_fini(void)
297{
298 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
299}
300
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800301int __init xfrm6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800303 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;
312out:
313 return ret;
314out_policy:
315 xfrm6_policy_fini();
316 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
319void xfrm6_fini(void)
320{
321 //xfrm6_input_fini();
322 xfrm6_policy_fini();
323 xfrm6_state_fini();
324}