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>
20 #include <net/ip6_route.h>
21 #ifdef CONFIG_IPV6_MIP6
25 static struct dst_ops xfrm6_dst_ops;
26 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
28 static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
31 *dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
37 static struct dst_entry *
38 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
40 struct dst_entry *dst;
42 /* Still not clear if we should set fl->fl6_{src,dst}... */
43 read_lock_bh(&policy->lock);
44 for (dst = policy->bundles; dst; dst = dst->next) {
45 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
46 struct in6_addr fl_dst_prefix, fl_src_prefix;
48 ipv6_addr_prefix(&fl_dst_prefix,
50 xdst->u.rt6.rt6i_dst.plen);
51 ipv6_addr_prefix(&fl_src_prefix,
53 xdst->u.rt6.rt6i_src.plen);
54 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
55 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
56 xfrm_bundle_ok(xdst, fl, AF_INET6,
57 (xdst->u.rt6.rt6i_dst.plen != 128 ||
58 xdst->u.rt6.rt6i_src.plen != 128))) {
63 read_unlock_bh(&policy->lock);
67 static inline struct in6_addr*
68 __xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
70 return (x->type->remote_addr) ?
71 (struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
72 (struct in6_addr*)&x->id.daddr;
75 static inline struct in6_addr*
76 __xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
78 return (x->type->local_addr) ?
79 (struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
80 (struct in6_addr*)&x->props.saddr;
84 __xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
86 if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
87 *nflen += x->props.header_len;
89 *len += x->props.header_len;
93 __xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
95 if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
96 *nflen -= x->props.header_len;
98 *len -= x->props.header_len;
101 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
102 * all the metrics... Shortly, bundle a bundle.
106 __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
107 struct flowi *fl, struct dst_entry **dst_p)
109 struct dst_entry *dst, *dst_prev;
110 struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
111 struct rt6_info *rt = rt0;
112 struct in6_addr *remote = &fl->fl6_dst;
113 struct in6_addr *local = &fl->fl6_src;
114 struct flowi fl_tunnel = {
125 int nfheader_len = 0;
128 dst = dst_prev = NULL;
129 dst_hold(&rt->u.dst);
131 for (i = 0; i < nx; i++) {
132 struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
133 struct xfrm_dst *xdst;
136 if (unlikely(dst1 == NULL)) {
138 dst_release(&rt->u.dst);
145 dst_prev->child = dst1;
146 dst1->flags |= DST_NOHASH;
150 xdst = (struct xfrm_dst *)dst1;
151 xdst->route = &rt->u.dst;
152 xdst->genid = xfrm[i]->genid;
154 xdst->route_cookie = rt->rt6i_node->fn_sernum;
156 dst1->next = dst_prev;
158 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
159 remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
160 local = __xfrm6_bundle_addr_local(xfrm[i], local);
163 __xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
164 trailer_len += xfrm[i]->props.trailer_len;
167 ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
168 ipv6_addr_copy(&fl_tunnel.fl6_src, local);
169 err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
170 &fl_tunnel, AF_INET6);
174 dst_hold(&rt->u.dst);
177 dst_prev->child = &rt->u.dst;
178 dst->path = &rt->u.dst;
180 ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
187 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
188 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
190 dst_prev->xfrm = xfrm[i++];
191 dst_prev->dev = rt->u.dst.dev;
193 dev_hold(rt->u.dst.dev);
194 dst_prev->obsolete = -1;
195 dst_prev->flags |= DST_HOST;
196 dst_prev->lastuse = jiffies;
197 dst_prev->header_len = header_len;
198 dst_prev->nfheader_len = nfheader_len;
199 dst_prev->trailer_len = trailer_len;
200 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
202 /* Copy neighbour for reachability confirmation */
203 dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
204 dst_prev->input = rt->u.dst.input;
205 dst_prev->output = xfrm6_output;
206 /* Sheit... I remember I did this right. Apparently,
207 * it was magically lost, so this code needs audit */
208 x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
209 x->u.rt6.rt6i_metric = rt0->rt6i_metric;
210 x->u.rt6.rt6i_node = rt0->rt6i_node;
211 x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
212 memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
213 x->u.rt6.rt6i_dst = rt0->rt6i_dst;
214 x->u.rt6.rt6i_src = rt0->rt6i_src;
215 x->u.rt6.rt6i_idev = rt0->rt6i_idev;
216 in6_dev_hold(rt0->rt6i_idev);
217 __xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
218 trailer_len -= x->u.dst.xfrm->props.trailer_len;
231 _decode_session6(struct sk_buff *skb, struct flowi *fl)
233 u16 offset = skb->h.raw - skb->nh.raw;
234 struct ipv6hdr *hdr = skb->nh.ipv6h;
235 struct ipv6_opt_hdr *exthdr;
236 u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff];
238 memset(fl, 0, sizeof(struct flowi));
239 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
240 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
242 while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
243 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
246 case NEXTHDR_ROUTING:
249 offset += ipv6_optlen(exthdr);
250 nexthdr = exthdr->nexthdr;
251 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
258 if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
259 u16 *ports = (u16 *)exthdr;
261 fl->fl_ip_sport = ports[0];
262 fl->fl_ip_dport = ports[1];
268 if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
269 u8 *icmp = (u8 *)exthdr;
271 fl->fl_icmp_type = icmp[0];
272 fl->fl_icmp_code = icmp[1];
277 #ifdef CONFIG_IPV6_MIP6
279 if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) {
281 mh = (struct ip6_mh *)exthdr;
283 fl->fl_mh_type = mh->ip6mh_type;
289 /* XXX Why are there these headers? */
294 fl->fl_ipsec_spi = 0;
301 static inline int xfrm6_garbage_collect(void)
303 xfrm6_policy_afinfo.garbage_collect();
304 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
307 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
309 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
310 struct dst_entry *path = xdst->route;
312 path->ops->update_pmtu(path, mtu);
315 static void xfrm6_dst_destroy(struct dst_entry *dst)
317 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
319 if (likely(xdst->u.rt6.rt6i_idev))
320 in6_dev_put(xdst->u.rt6.rt6i_idev);
321 xfrm_dst_destroy(xdst);
324 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
327 struct xfrm_dst *xdst;
332 xdst = (struct xfrm_dst *)dst;
333 if (xdst->u.rt6.rt6i_idev->dev == dev) {
334 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
335 BUG_ON(!loopback_idev);
338 in6_dev_put(xdst->u.rt6.rt6i_idev);
339 xdst->u.rt6.rt6i_idev = loopback_idev;
340 in6_dev_hold(loopback_idev);
341 xdst = (struct xfrm_dst *)xdst->u.dst.child;
342 } while (xdst->u.dst.xfrm);
344 __in6_dev_put(loopback_idev);
347 xfrm_dst_ifdown(dst, dev);
350 static struct dst_ops xfrm6_dst_ops = {
352 .protocol = __constant_htons(ETH_P_IPV6),
353 .gc = xfrm6_garbage_collect,
354 .update_pmtu = xfrm6_update_pmtu,
355 .destroy = xfrm6_dst_destroy,
356 .ifdown = xfrm6_dst_ifdown,
358 .entry_size = sizeof(struct xfrm_dst),
361 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
363 .dst_ops = &xfrm6_dst_ops,
364 .dst_lookup = xfrm6_dst_lookup,
365 .find_bundle = __xfrm6_find_bundle,
366 .bundle_create = __xfrm6_bundle_create,
367 .decode_session = _decode_session6,
370 static void __init xfrm6_policy_init(void)
372 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
375 static void xfrm6_policy_fini(void)
377 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
380 void __init xfrm6_init(void)
386 void xfrm6_fini(void)
388 //xfrm6_input_fini();