2 * xfrm6_policy.c: based on xfrm4_policy.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * Split up af-specific portion
14 #include <linux/compiler.h>
15 #include <linux/netdevice.h>
16 #include <net/addrconf.h>
21 #include <net/ip6_route.h>
22 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
26 static struct dst_ops xfrm6_dst_ops;
27 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
29 static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
31 struct dst_entry *dst = ip6_route_output(NULL, fl);
34 *xdst = (struct xfrm_dst *) dst;
40 static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
43 struct flowi fl_tunnel = {
46 .daddr = *(struct in6_addr *)&daddr->a6,
51 if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
52 ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
53 (struct in6_addr *)&saddr->a6);
54 dst_release(&rt->u.dst);
60 static struct dst_entry *
61 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
63 struct dst_entry *dst;
65 /* Still not clear if we should set fl->fl6_{src,dst}... */
66 read_lock_bh(&policy->lock);
67 for (dst = policy->bundles; dst; dst = dst->next) {
68 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
69 struct in6_addr fl_dst_prefix, fl_src_prefix;
71 ipv6_addr_prefix(&fl_dst_prefix,
73 xdst->u.rt6.rt6i_dst.plen);
74 ipv6_addr_prefix(&fl_src_prefix,
76 xdst->u.rt6.rt6i_src.plen);
77 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
78 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
79 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
80 (xdst->u.rt6.rt6i_dst.plen != 128 ||
81 xdst->u.rt6.rt6i_src.plen != 128))) {
86 read_unlock_bh(&policy->lock);
90 static inline xfrm_address_t *__xfrm6_bundle_addr_remote(struct xfrm_state *x)
92 return (x->type->flags & XFRM_TYPE_REMOTE_COADDR) ? x->coaddr :
96 static inline xfrm_address_t *__xfrm6_bundle_addr_local(struct xfrm_state *x)
98 return (x->type->flags & XFRM_TYPE_LOCAL_COADDR) ? x->coaddr :
102 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
103 * all the metrics... Shortly, bundle a bundle.
107 __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
108 struct flowi *fl, struct dst_entry **dst_p)
110 struct dst_entry *dst, *dst_prev;
111 struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
112 struct rt6_info *rt = rt0;
113 struct flowi fl_tunnel = {
116 .saddr = fl->fl6_src,
117 .daddr = fl->fl6_dst,
126 dst = dst_prev = NULL;
127 dst_hold(&rt->u.dst);
129 for (i = 0; i < nx; i++) {
130 struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
131 struct xfrm_dst *xdst;
133 if (unlikely(dst1 == NULL)) {
135 dst_release(&rt->u.dst);
142 dst_prev->child = dst1;
143 dst1->flags |= DST_NOHASH;
147 xdst = (struct xfrm_dst *)dst1;
148 xdst->route = &rt->u.dst;
149 xdst->genid = xfrm[i]->genid;
151 xdst->route_cookie = rt->rt6i_node->fn_sernum;
153 dst1->next = dst_prev;
156 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
157 ((struct rt6_info *)dst)->nfheader_len +=
158 xfrm[i]->props.header_len;
159 header_len += xfrm[i]->props.header_len;
160 trailer_len += xfrm[i]->props.trailer_len;
162 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
163 unsigned short encap_family = xfrm[i]->props.family;
164 switch(encap_family) {
166 fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
167 fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
170 ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr *)__xfrm6_bundle_addr_remote(xfrm[i]));
172 ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr *)__xfrm6_bundle_addr_local(xfrm[i]));
178 err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
179 &fl_tunnel, encap_family);
183 dst_hold(&rt->u.dst);
186 dst_prev->child = &rt->u.dst;
187 dst->path = &rt->u.dst;
189 /* Copy neighbour for reachability confirmation */
190 dst->neighbour = neigh_clone(rt->u.dst.neighbour);
193 ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
201 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
202 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
204 dst_prev->xfrm = xfrm[i++];
205 dst_prev->dev = rt->u.dst.dev;
208 dev_hold(rt->u.dst.dev);
210 x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
211 if (!x->u.rt6.rt6i_idev)
214 dst_prev->obsolete = -1;
215 dst_prev->flags |= DST_HOST;
216 dst_prev->lastuse = jiffies;
217 dst_prev->header_len = header_len;
218 dst_prev->trailer_len = trailer_len;
219 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
221 dst_prev->input = dst_discard;
222 dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
223 /* Sheit... I remember I did this right. Apparently,
224 * it was magically lost, so this code needs audit */
225 x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST|RTF_LOCAL);
226 x->u.rt6.rt6i_metric = rt0->rt6i_metric;
227 x->u.rt6.rt6i_node = rt0->rt6i_node;
228 x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
229 memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
230 x->u.rt6.rt6i_dst = rt0->rt6i_dst;
231 x->u.rt6.rt6i_src = rt0->rt6i_src;
232 header_len -= x->u.dst.xfrm->props.header_len;
233 trailer_len -= x->u.dst.xfrm->props.trailer_len;
246 _decode_session6(struct sk_buff *skb, struct flowi *fl)
248 u16 offset = skb_network_header_len(skb);
249 struct ipv6hdr *hdr = ipv6_hdr(skb);
250 struct ipv6_opt_hdr *exthdr;
251 const unsigned char *nh = skb_network_header(skb);
252 u8 nexthdr = nh[IP6CB(skb)->nhoff];
254 memset(fl, 0, sizeof(struct flowi));
255 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
256 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
258 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
259 nh = skb_network_header(skb);
260 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
263 case NEXTHDR_ROUTING:
266 offset += ipv6_optlen(exthdr);
267 nexthdr = exthdr->nexthdr;
268 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
272 case IPPROTO_UDPLITE:
276 if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
277 __be16 *ports = (__be16 *)exthdr;
279 fl->fl_ip_sport = ports[0];
280 fl->fl_ip_dport = ports[1];
286 if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
287 u8 *icmp = (u8 *)exthdr;
289 fl->fl_icmp_type = icmp[0];
290 fl->fl_icmp_code = icmp[1];
295 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
297 if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
299 mh = (struct ip6_mh *)exthdr;
301 fl->fl_mh_type = mh->ip6mh_type;
307 /* XXX Why are there these headers? */
312 fl->fl_ipsec_spi = 0;
319 static inline int xfrm6_garbage_collect(void)
321 xfrm6_policy_afinfo.garbage_collect();
322 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
325 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
327 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
328 struct dst_entry *path = xdst->route;
330 path->ops->update_pmtu(path, mtu);
333 static void xfrm6_dst_destroy(struct dst_entry *dst)
335 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
337 if (likely(xdst->u.rt6.rt6i_idev))
338 in6_dev_put(xdst->u.rt6.rt6i_idev);
339 xfrm_dst_destroy(xdst);
342 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
345 struct xfrm_dst *xdst;
350 xdst = (struct xfrm_dst *)dst;
351 if (xdst->u.rt6.rt6i_idev->dev == dev) {
352 struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
353 BUG_ON(!loopback_idev);
356 in6_dev_put(xdst->u.rt6.rt6i_idev);
357 xdst->u.rt6.rt6i_idev = loopback_idev;
358 in6_dev_hold(loopback_idev);
359 xdst = (struct xfrm_dst *)xdst->u.dst.child;
360 } while (xdst->u.dst.xfrm);
362 __in6_dev_put(loopback_idev);
365 xfrm_dst_ifdown(dst, dev);
368 static struct dst_ops xfrm6_dst_ops = {
370 .protocol = __constant_htons(ETH_P_IPV6),
371 .gc = xfrm6_garbage_collect,
372 .update_pmtu = xfrm6_update_pmtu,
373 .destroy = xfrm6_dst_destroy,
374 .ifdown = xfrm6_dst_ifdown,
376 .entry_size = sizeof(struct xfrm_dst),
379 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
381 .dst_ops = &xfrm6_dst_ops,
382 .dst_lookup = xfrm6_dst_lookup,
383 .get_saddr = xfrm6_get_saddr,
384 .find_bundle = __xfrm6_find_bundle,
385 .bundle_create = __xfrm6_bundle_create,
386 .decode_session = _decode_session6,
389 static void __init xfrm6_policy_init(void)
391 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
394 static void xfrm6_policy_fini(void)
396 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
399 void __init xfrm6_init(void)
405 void xfrm6_fini(void)
407 //xfrm6_input_fini();