5 * Kazunori MIYAZAWA @USAGI
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
11 #include <linux/compiler.h>
12 #include <linux/inetdevice.h>
16 static struct dst_ops xfrm4_dst_ops;
17 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
19 static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
21 return __ip_route_output_key((struct rtable**)dst, fl);
24 static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
27 struct flowi fl_tunnel = {
35 if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
36 saddr->a4 = rt->rt_src;
37 dst_release(&rt->u.dst);
43 static struct dst_entry *
44 __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
46 struct dst_entry *dst;
48 read_lock_bh(&policy->lock);
49 for (dst = policy->bundles; dst; dst = dst->next) {
50 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
51 if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
52 xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
53 xdst->u.rt.fl.fl4_src == fl->fl4_src &&
54 xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
55 xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
60 read_unlock_bh(&policy->lock);
64 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
65 * all the metrics... Shortly, bundle a bundle.
69 __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
70 struct flowi *fl, struct dst_entry **dst_p)
72 struct dst_entry *dst, *dst_prev;
73 struct rtable *rt0 = (struct rtable*)(*dst_p);
74 struct rtable *rt = rt0;
75 u32 remote = fl->fl4_dst;
76 u32 local = fl->fl4_src;
77 struct flowi fl_tunnel = {
91 dst = dst_prev = NULL;
94 for (i = 0; i < nx; i++) {
95 struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
96 struct xfrm_dst *xdst;
99 if (unlikely(dst1 == NULL)) {
101 dst_release(&rt->u.dst);
108 dst_prev->child = dst1;
109 dst1->flags |= DST_NOHASH;
113 xdst = (struct xfrm_dst *)dst1;
114 xdst->route = &rt->u.dst;
115 xdst->genid = xfrm[i]->genid;
117 dst1->next = dst_prev;
119 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
120 remote = xfrm[i]->id.daddr.a4;
121 local = xfrm[i]->props.saddr.a4;
124 header_len += xfrm[i]->props.header_len;
125 trailer_len += xfrm[i]->props.trailer_len;
128 fl_tunnel.fl4_src = local;
129 fl_tunnel.fl4_dst = remote;
130 err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
131 &fl_tunnel, AF_INET);
135 dst_hold(&rt->u.dst);
138 dst_prev->child = &rt->u.dst;
139 dst->path = &rt->u.dst;
146 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
147 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
150 dst_prev->xfrm = xfrm[i++];
151 dst_prev->dev = rt->u.dst.dev;
153 dev_hold(rt->u.dst.dev);
154 dst_prev->obsolete = -1;
155 dst_prev->flags |= DST_HOST;
156 dst_prev->lastuse = jiffies;
157 dst_prev->header_len = header_len;
158 dst_prev->nfheader_len = 0;
159 dst_prev->trailer_len = trailer_len;
160 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
162 /* Copy neighbout for reachability confirmation */
163 dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
164 dst_prev->input = rt->u.dst.input;
165 dst_prev->output = xfrm4_output;
167 atomic_inc(&rt->peer->refcnt);
168 x->u.rt.peer = rt->peer;
169 /* Sheit... I remember I did this right. Apparently,
170 * it was magically lost, so this code needs audit */
171 x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
172 x->u.rt.rt_type = rt->rt_type;
173 x->u.rt.rt_src = rt0->rt_src;
174 x->u.rt.rt_dst = rt0->rt_dst;
175 x->u.rt.rt_gateway = rt->rt_gateway;
176 x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
177 x->u.rt.idev = rt0->idev;
178 in_dev_hold(rt0->idev);
179 header_len -= x->u.dst.xfrm->props.header_len;
180 trailer_len -= x->u.dst.xfrm->props.trailer_len;
193 _decode_session4(struct sk_buff *skb, struct flowi *fl)
195 struct iphdr *iph = skb->nh.iph;
196 u8 *xprth = skb->nh.raw + iph->ihl*4;
198 memset(fl, 0, sizeof(struct flowi));
199 if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
200 switch (iph->protocol) {
205 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
206 u16 *ports = (u16 *)xprth;
208 fl->fl_ip_sport = ports[0];
209 fl->fl_ip_dport = ports[1];
214 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
217 fl->fl_icmp_type = icmp[0];
218 fl->fl_icmp_code = icmp[1];
223 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
224 __be32 *ehdr = (__be32 *)xprth;
226 fl->fl_ipsec_spi = ehdr[0];
231 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
232 __be32 *ah_hdr = (__be32*)xprth;
234 fl->fl_ipsec_spi = ah_hdr[1];
239 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
240 __be16 *ipcomp_hdr = (__be16 *)xprth;
242 fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
246 fl->fl_ipsec_spi = 0;
250 fl->proto = iph->protocol;
251 fl->fl4_dst = iph->daddr;
252 fl->fl4_src = iph->saddr;
253 fl->fl4_tos = iph->tos;
256 static inline int xfrm4_garbage_collect(void)
258 xfrm4_policy_afinfo.garbage_collect();
259 return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
262 static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
264 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
265 struct dst_entry *path = xdst->route;
267 path->ops->update_pmtu(path, mtu);
270 static void xfrm4_dst_destroy(struct dst_entry *dst)
272 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
274 if (likely(xdst->u.rt.idev))
275 in_dev_put(xdst->u.rt.idev);
276 xfrm_dst_destroy(xdst);
279 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
282 struct xfrm_dst *xdst;
287 xdst = (struct xfrm_dst *)dst;
288 if (xdst->u.rt.idev->dev == dev) {
289 struct in_device *loopback_idev = in_dev_get(&loopback_dev);
290 BUG_ON(!loopback_idev);
293 in_dev_put(xdst->u.rt.idev);
294 xdst->u.rt.idev = loopback_idev;
295 in_dev_hold(loopback_idev);
296 xdst = (struct xfrm_dst *)xdst->u.dst.child;
297 } while (xdst->u.dst.xfrm);
299 __in_dev_put(loopback_idev);
302 xfrm_dst_ifdown(dst, dev);
305 static struct dst_ops xfrm4_dst_ops = {
307 .protocol = __constant_htons(ETH_P_IP),
308 .gc = xfrm4_garbage_collect,
309 .update_pmtu = xfrm4_update_pmtu,
310 .destroy = xfrm4_dst_destroy,
311 .ifdown = xfrm4_dst_ifdown,
313 .entry_size = sizeof(struct xfrm_dst),
316 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
318 .dst_ops = &xfrm4_dst_ops,
319 .dst_lookup = xfrm4_dst_lookup,
320 .get_saddr = xfrm4_get_saddr,
321 .find_bundle = __xfrm4_find_bundle,
322 .bundle_create = __xfrm4_bundle_create,
323 .decode_session = _decode_session4,
326 static void __init xfrm4_policy_init(void)
328 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
331 static void __exit xfrm4_policy_fini(void)
333 xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
336 void __init xfrm4_init(void)