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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
41 dst = ip6_route_output(NULL, &fl);
42
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
60 ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
61 (struct in6_addr *)&saddr->a6);
62 dst_release(dst);
63 return 0;
Patrick McHardya1e59ab2006-09-19 12:57:34 -070064}
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static 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) &&
Venkat Yekkirala5b368e62006-10-05 15:42:18 -050085 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -070086 (xdst->u.rt6.rt6i_dst.plen != 128 ||
87 xdst->u.rt6.rt6i_src.plen != 128))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 dst_clone(dst);
89 break;
90 }
91 }
92 read_unlock_bh(&policy->lock);
93 return dst;
94}
95
Herbert Xu25ee3282007-12-11 09:32:34 -080096static int xfrm6_get_tos(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 return 0;
Herbert Xu25ee3282007-12-11 09:32:34 -080099}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800101static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
102 int nfheader_len)
103{
104 if (dst->ops->family == AF_INET6) {
105 struct rt6_info *rt = (struct rt6_info*)dst;
106 if (rt->rt6i_node)
107 path->path_cookie = rt->rt6i_node->fn_sernum;
108 }
109
110 path->u.rt6.rt6i_nfheader_len = nfheader_len;
111
112 return 0;
113}
114
Herbert Xu25ee3282007-12-11 09:32:34 -0800115static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
116{
117 struct rt6_info *rt = (struct rt6_info*)xdst->route;
118
119 xdst->u.dst.dev = dev;
120 dev_hold(dev);
121
122 xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
123 if (!xdst->u.rt6.rt6i_idev)
124 return -ENODEV;
125
126 /* Sheit... I remember I did this right. Apparently,
127 * it was magically lost, so this code needs audit */
128 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
129 RTF_LOCAL);
130 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
131 xdst->u.rt6.rt6i_node = rt->rt6i_node;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800132 if (rt->rt6i_node)
133 xdst->route_cookie = rt->rt6i_node->fn_sernum;
Herbert Xu25ee3282007-12-11 09:32:34 -0800134 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
135 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
136 xdst->u.rt6.rt6i_src = rt->rt6i_src;
137
138 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141static inline void
Herbert Xud5422ef2007-12-12 10:44:16 -0800142_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300144 u16 offset = skb_network_header_len(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700145 struct ipv6hdr *hdr = ipv6_hdr(skb);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700146 struct ipv6_opt_hdr *exthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700147 const unsigned char *nh = skb_network_header(skb);
148 u8 nexthdr = nh[IP6CB(skb)->nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 memset(fl, 0, sizeof(struct flowi));
Herbert Xud5422ef2007-12-12 10:44:16 -0800151 ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
152 ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700154 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
155 nh = skb_network_header(skb);
156 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
YOSHIFUJI Hideakie3cae902006-04-18 14:46:52 -0700157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 switch (nexthdr) {
159 case NEXTHDR_ROUTING:
160 case NEXTHDR_HOP:
161 case NEXTHDR_DEST:
162 offset += ipv6_optlen(exthdr);
163 nexthdr = exthdr->nexthdr;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700164 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 break;
166
167 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800168 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 case IPPROTO_TCP:
170 case IPPROTO_SCTP:
Patrick McHardy9e999992005-12-19 14:03:46 -0800171 case IPPROTO_DCCP:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700172 if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
Al Viro8c689a62006-11-08 00:20:21 -0800173 __be16 *ports = (__be16 *)exthdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Herbert Xud5422ef2007-12-12 10:44:16 -0800175 fl->fl_ip_sport = ports[!!reverse];
176 fl->fl_ip_dport = ports[!reverse];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
178 fl->proto = nexthdr;
179 return;
180
181 case IPPROTO_ICMPV6:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700182 if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 u8 *icmp = (u8 *)exthdr;
184
185 fl->fl_icmp_type = icmp[0];
186 fl->fl_icmp_code = icmp[1];
187 }
188 fl->proto = nexthdr;
189 return;
190
Masahide NAKAMURA59fbb3a62007-06-26 23:56:32 -0700191#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700192 case IPPROTO_MH:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700193 if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700194 struct ip6_mh *mh;
195 mh = (struct ip6_mh *)exthdr;
196
197 fl->fl_mh_type = mh->ip6mh_type;
198 }
199 fl->proto = nexthdr;
200 return;
201#endif
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 /* XXX Why are there these headers? */
204 case IPPROTO_AH:
205 case IPPROTO_ESP:
206 case IPPROTO_COMP:
207 default:
208 fl->fl_ipsec_spi = 0;
209 fl->proto = nexthdr;
210 return;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213}
214
Daniel Lezcano569d3642008-01-18 03:56:57 -0800215static inline int xfrm6_garbage_collect(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 xfrm6_policy_afinfo.garbage_collect();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
219}
220
221static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
222{
223 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
224 struct dst_entry *path = xdst->route;
225
226 path->ops->update_pmtu(path, mtu);
227}
228
Herbert Xuaabc9762005-05-03 16:27:10 -0700229static void xfrm6_dst_destroy(struct dst_entry *dst)
230{
231 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
232
233 if (likely(xdst->u.rt6.rt6i_idev))
234 in6_dev_put(xdst->u.rt6.rt6i_idev);
235 xfrm_dst_destroy(xdst);
236}
237
238static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
239 int unregister)
240{
241 struct xfrm_dst *xdst;
242
243 if (!unregister)
244 return;
245
246 xdst = (struct xfrm_dst *)dst;
247 if (xdst->u.rt6.rt6i_idev->dev == dev) {
Denis V. Lunev5a3e55d2007-12-07 00:38:10 -0800248 struct inet6_dev *loopback_idev =
249 in6_dev_get(dev->nd_net->loopback_dev);
Herbert Xuaabc9762005-05-03 16:27:10 -0700250 BUG_ON(!loopback_idev);
251
252 do {
253 in6_dev_put(xdst->u.rt6.rt6i_idev);
254 xdst->u.rt6.rt6i_idev = loopback_idev;
255 in6_dev_hold(loopback_idev);
256 xdst = (struct xfrm_dst *)xdst->u.dst.child;
257 } while (xdst->u.dst.xfrm);
258
259 __in6_dev_put(loopback_idev);
260 }
261
262 xfrm_dst_ifdown(dst, dev);
263}
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265static struct dst_ops xfrm6_dst_ops = {
266 .family = AF_INET6,
267 .protocol = __constant_htons(ETH_P_IPV6),
268 .gc = xfrm6_garbage_collect,
269 .update_pmtu = xfrm6_update_pmtu,
Herbert Xuaabc9762005-05-03 16:27:10 -0700270 .destroy = xfrm6_dst_destroy,
271 .ifdown = xfrm6_dst_ifdown,
Herbert Xu862b82c2007-11-13 21:43:11 -0800272 .local_out = __ip6_local_out,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 .gc_thresh = 1024,
274 .entry_size = sizeof(struct xfrm_dst),
275};
276
277static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
278 .family = AF_INET6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 .dst_ops = &xfrm6_dst_ops,
280 .dst_lookup = xfrm6_dst_lookup,
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700281 .get_saddr = xfrm6_get_saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 .find_bundle = __xfrm6_find_bundle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 .decode_session = _decode_session6,
Herbert Xu25ee3282007-12-11 09:32:34 -0800284 .get_tos = xfrm6_get_tos,
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800285 .init_path = xfrm6_init_path,
Herbert Xu25ee3282007-12-11 09:32:34 -0800286 .fill_dst = xfrm6_fill_dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287};
288
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800289static int __init xfrm6_policy_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800291 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
294static void xfrm6_policy_fini(void)
295{
296 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
297}
298
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800299int __init xfrm6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Daniel Lezcano0013cab2007-12-07 00:42:11 -0800301 int ret;
302
303 ret = xfrm6_policy_init();
304 if (ret)
305 goto out;
306
307 ret = xfrm6_state_init();
308 if (ret)
309 goto out_policy;
310out:
311 return ret;
312out_policy:
313 xfrm6_policy_fini();
314 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
316
317void xfrm6_fini(void)
318{
319 //xfrm6_input_fini();
320 xfrm6_policy_fini();
321 xfrm6_state_fini();
322}