5 * Kazunori MIYAZAWA @USAGI
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
11 #include <linux/compiler.h>
12 #include <linux/inetdevice.h>
17 static struct dst_ops xfrm4_dst_ops;
18 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
20 static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
22 return __ip_route_output_key((struct rtable**)dst, fl);
25 static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
28 struct flowi fl_tunnel = {
36 if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
37 saddr->a4 = rt->rt_src;
38 dst_release(&rt->u.dst);
44 static struct dst_entry *
45 __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
47 struct dst_entry *dst;
49 read_lock_bh(&policy->lock);
50 for (dst = policy->bundles; dst; dst = dst->next) {
51 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
52 if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
53 xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
54 xdst->u.rt.fl.fl4_src == fl->fl4_src &&
55 xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
56 xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
61 read_unlock_bh(&policy->lock);
65 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
66 * all the metrics... Shortly, bundle a bundle.
70 __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
71 struct flowi *fl, struct dst_entry **dst_p)
73 struct dst_entry *dst, *dst_prev;
74 struct rtable *rt0 = (struct rtable*)(*dst_p);
75 struct rtable *rt = rt0;
76 struct flowi fl_tunnel = {
90 dst = dst_prev = NULL;
93 for (i = 0; i < nx; i++) {
94 struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
95 struct xfrm_dst *xdst;
97 if (unlikely(dst1 == NULL)) {
99 dst_release(&rt->u.dst);
106 dst_prev->child = dst1;
107 dst1->flags |= DST_NOHASH;
111 xdst = (struct xfrm_dst *)dst1;
112 xdst->route = &rt->u.dst;
113 xdst->genid = xfrm[i]->genid;
115 dst1->next = dst_prev;
118 header_len += xfrm[i]->props.header_len;
119 trailer_len += xfrm[i]->props.trailer_len;
121 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
122 unsigned short encap_family = xfrm[i]->props.family;
123 switch (encap_family) {
125 fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
126 fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
130 ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
131 ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
137 err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
138 &fl_tunnel, encap_family);
142 dst_hold(&rt->u.dst);
145 dst_prev->child = &rt->u.dst;
146 dst->path = &rt->u.dst;
148 /* Copy neighbout for reachability confirmation */
149 dst->neighbour = neigh_clone(rt->u.dst.neighbour);
156 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
157 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
160 dst_prev->xfrm = xfrm[i++];
161 dst_prev->dev = rt->u.dst.dev;
163 dev_hold(rt->u.dst.dev);
164 dst_prev->obsolete = -1;
165 dst_prev->flags |= DST_HOST;
166 dst_prev->lastuse = jiffies;
167 dst_prev->header_len = header_len;
168 dst_prev->trailer_len = trailer_len;
169 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
171 dst_prev->input = dst_discard;
172 dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
174 atomic_inc(&rt0->peer->refcnt);
175 x->u.rt.peer = rt0->peer;
176 /* Sheit... I remember I did this right. Apparently,
177 * it was magically lost, so this code needs audit */
178 x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
179 x->u.rt.rt_type = rt0->rt_type;
180 x->u.rt.rt_src = rt0->rt_src;
181 x->u.rt.rt_dst = rt0->rt_dst;
182 x->u.rt.rt_gateway = rt0->rt_gateway;
183 x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
184 x->u.rt.idev = rt0->idev;
185 in_dev_hold(rt0->idev);
186 header_len -= x->u.dst.xfrm->props.header_len;
187 trailer_len -= x->u.dst.xfrm->props.trailer_len;
200 _decode_session4(struct sk_buff *skb, struct flowi *fl)
202 struct iphdr *iph = ip_hdr(skb);
203 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
205 memset(fl, 0, sizeof(struct flowi));
206 if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
207 switch (iph->protocol) {
209 case IPPROTO_UDPLITE:
213 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
214 __be16 *ports = (__be16 *)xprth;
216 fl->fl_ip_sport = ports[0];
217 fl->fl_ip_dport = ports[1];
222 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
225 fl->fl_icmp_type = icmp[0];
226 fl->fl_icmp_code = icmp[1];
231 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
232 __be32 *ehdr = (__be32 *)xprth;
234 fl->fl_ipsec_spi = ehdr[0];
239 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
240 __be32 *ah_hdr = (__be32*)xprth;
242 fl->fl_ipsec_spi = ah_hdr[1];
247 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
248 __be16 *ipcomp_hdr = (__be16 *)xprth;
250 fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
254 fl->fl_ipsec_spi = 0;
258 fl->proto = iph->protocol;
259 fl->fl4_dst = iph->daddr;
260 fl->fl4_src = iph->saddr;
261 fl->fl4_tos = iph->tos;
264 static inline int xfrm4_garbage_collect(void)
266 xfrm4_policy_afinfo.garbage_collect();
267 return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
270 static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
272 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
273 struct dst_entry *path = xdst->route;
275 path->ops->update_pmtu(path, mtu);
278 static void xfrm4_dst_destroy(struct dst_entry *dst)
280 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
282 if (likely(xdst->u.rt.idev))
283 in_dev_put(xdst->u.rt.idev);
284 if (likely(xdst->u.rt.peer))
285 inet_putpeer(xdst->u.rt.peer);
286 xfrm_dst_destroy(xdst);
289 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
292 struct xfrm_dst *xdst;
297 xdst = (struct xfrm_dst *)dst;
298 if (xdst->u.rt.idev->dev == dev) {
299 struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
300 BUG_ON(!loopback_idev);
303 in_dev_put(xdst->u.rt.idev);
304 xdst->u.rt.idev = loopback_idev;
305 in_dev_hold(loopback_idev);
306 xdst = (struct xfrm_dst *)xdst->u.dst.child;
307 } while (xdst->u.dst.xfrm);
309 __in_dev_put(loopback_idev);
312 xfrm_dst_ifdown(dst, dev);
315 static struct dst_ops xfrm4_dst_ops = {
317 .protocol = __constant_htons(ETH_P_IP),
318 .gc = xfrm4_garbage_collect,
319 .update_pmtu = xfrm4_update_pmtu,
320 .destroy = xfrm4_dst_destroy,
321 .ifdown = xfrm4_dst_ifdown,
323 .entry_size = sizeof(struct xfrm_dst),
326 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
328 .dst_ops = &xfrm4_dst_ops,
329 .dst_lookup = xfrm4_dst_lookup,
330 .get_saddr = xfrm4_get_saddr,
331 .find_bundle = __xfrm4_find_bundle,
332 .bundle_create = __xfrm4_bundle_create,
333 .decode_session = _decode_session4,
336 static void __init xfrm4_policy_init(void)
338 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
341 static void __exit xfrm4_policy_fini(void)
343 xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
346 void __init xfrm4_init(void)