5 * Kazunori MIYAZAWA @USAGI
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
11 #include <linux/err.h>
12 #include <linux/kernel.h>
13 #include <linux/inetdevice.h>
14 #include <linux/if_tunnel.h>
18 #include <net/l3mdev.h>
19 #include <net/inet_ecn.h>
21 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
23 static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
25 const xfrm_address_t *saddr,
26 const xfrm_address_t *daddr)
30 memset(fl4, 0, sizeof(*fl4));
31 fl4->daddr = daddr->a4;
32 fl4->flowi4_tos = tos;
33 fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
35 fl4->saddr = saddr->a4;
37 fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
39 rt = __ip_route_output_key(net, fl4);
46 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
47 const xfrm_address_t *saddr,
48 const xfrm_address_t *daddr)
52 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
55 static int xfrm4_get_saddr(struct net *net, int oif,
56 xfrm_address_t *saddr, xfrm_address_t *daddr)
58 struct dst_entry *dst;
61 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
65 saddr->a4 = fl4.saddr;
70 static int xfrm4_get_tos(const struct flowi *fl)
72 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
75 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
81 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
82 const struct flowi *fl)
84 struct rtable *rt = (struct rtable *)xdst->route;
85 const struct flowi4 *fl4 = &fl->u.ip4;
87 xdst->u.rt.rt_iif = fl4->flowi4_iif;
89 xdst->u.dst.dev = dev;
92 /* Sheit... I remember I did this right. Apparently,
93 * it was magically lost, so this code needs audit */
94 xdst->u.rt.rt_is_input = rt->rt_is_input;
95 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
97 xdst->u.rt.rt_type = rt->rt_type;
98 xdst->u.rt.rt_gateway = rt->rt_gateway;
99 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
100 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
101 xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked;
102 xdst->u.rt.rt_table_id = rt->rt_table_id;
103 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
109 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
111 const struct iphdr *iph = ip_hdr(skb);
113 u8 *xprth = skb_network_header(skb) + ihl * 4;
114 struct flowi4 *fl4 = &fl->u.ip4;
118 oif = skb_dst(skb)->dev->ifindex;
120 memset(fl4, 0, sizeof(struct flowi4));
121 fl4->flowi4_mark = skb->mark;
122 fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
124 fl4->flowi4_proto = iph->protocol;
125 fl4->daddr = reverse ? iph->saddr : iph->daddr;
126 fl4->saddr = reverse ? iph->daddr : iph->saddr;
127 fl4->flowi4_tos = iph->tos & ~INET_ECN_MASK;
129 if (!ip_is_fragment(iph)) {
130 switch (iph->protocol) {
132 case IPPROTO_UDPLITE:
136 if (xprth + 4 < skb->data ||
137 pskb_may_pull(skb, xprth + 4 - skb->data)) {
140 xprth = skb_network_header(skb) + ihl * 4;
141 ports = (__be16 *)xprth;
143 fl4->fl4_sport = ports[!!reverse];
144 fl4->fl4_dport = ports[!reverse];
149 if (xprth + 2 < skb->data ||
150 pskb_may_pull(skb, xprth + 2 - skb->data)) {
153 xprth = skb_network_header(skb) + ihl * 4;
156 fl4->fl4_icmp_type = icmp[0];
157 fl4->fl4_icmp_code = icmp[1];
162 if (xprth + 4 < skb->data ||
163 pskb_may_pull(skb, xprth + 4 - skb->data)) {
166 xprth = skb_network_header(skb) + ihl * 4;
167 ehdr = (__be32 *)xprth;
169 fl4->fl4_ipsec_spi = ehdr[0];
174 if (xprth + 8 < skb->data ||
175 pskb_may_pull(skb, xprth + 8 - skb->data)) {
178 xprth = skb_network_header(skb) + ihl * 4;
179 ah_hdr = (__be32 *)xprth;
181 fl4->fl4_ipsec_spi = ah_hdr[1];
186 if (xprth + 4 < skb->data ||
187 pskb_may_pull(skb, xprth + 4 - skb->data)) {
190 xprth = skb_network_header(skb) + ihl * 4;
191 ipcomp_hdr = (__be16 *)xprth;
193 fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
198 if (xprth + 12 < skb->data ||
199 pskb_may_pull(skb, xprth + 12 - skb->data)) {
203 xprth = skb_network_header(skb) + ihl * 4;
204 greflags = (__be16 *)xprth;
205 gre_hdr = (__be32 *)xprth;
207 if (greflags[0] & GRE_KEY) {
208 if (greflags[0] & GRE_CSUM)
210 fl4->fl4_gre_key = gre_hdr[1];
216 fl4->fl4_ipsec_spi = 0;
222 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
224 struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
226 xfrm4_policy_afinfo.garbage_collect(net);
227 return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
230 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
231 struct sk_buff *skb, u32 mtu)
233 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
234 struct dst_entry *path = xdst->route;
236 path->ops->update_pmtu(path, sk, skb, mtu);
239 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
242 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
243 struct dst_entry *path = xdst->route;
245 path->ops->redirect(path, sk, skb);
248 static void xfrm4_dst_destroy(struct dst_entry *dst)
250 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
252 dst_destroy_metrics_generic(dst);
254 xfrm_dst_destroy(xdst);
257 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
263 xfrm_dst_ifdown(dst, dev);
266 static struct dst_ops xfrm4_dst_ops_template = {
268 .gc = xfrm4_garbage_collect,
269 .update_pmtu = xfrm4_update_pmtu,
270 .redirect = xfrm4_redirect,
271 .cow_metrics = dst_cow_metrics_generic,
272 .destroy = xfrm4_dst_destroy,
273 .ifdown = xfrm4_dst_ifdown,
274 .local_out = __ip_local_out,
275 .gc_thresh = INT_MAX,
278 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
280 .dst_ops = &xfrm4_dst_ops_template,
281 .dst_lookup = xfrm4_dst_lookup,
282 .get_saddr = xfrm4_get_saddr,
283 .decode_session = _decode_session4,
284 .get_tos = xfrm4_get_tos,
285 .init_path = xfrm4_init_path,
286 .fill_dst = xfrm4_fill_dst,
287 .blackhole_route = ipv4_blackhole_route,
291 static struct ctl_table xfrm4_policy_table[] = {
293 .procname = "xfrm4_gc_thresh",
294 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
295 .maxlen = sizeof(int),
297 .proc_handler = proc_dointvec,
302 static __net_init int xfrm4_net_sysctl_init(struct net *net)
304 struct ctl_table *table;
305 struct ctl_table_header *hdr;
307 table = xfrm4_policy_table;
308 if (!net_eq(net, &init_net)) {
309 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
313 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
316 hdr = register_net_sysctl(net, "net/ipv4", table);
320 net->ipv4.xfrm4_hdr = hdr;
324 if (!net_eq(net, &init_net))
330 static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
332 struct ctl_table *table;
334 if (!net->ipv4.xfrm4_hdr)
337 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
338 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
339 if (!net_eq(net, &init_net))
342 #else /* CONFIG_SYSCTL */
343 static inline int xfrm4_net_sysctl_init(struct net *net)
348 static inline void xfrm4_net_sysctl_exit(struct net *net)
353 static int __net_init xfrm4_net_init(struct net *net)
357 memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
358 sizeof(xfrm4_dst_ops_template));
359 ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
363 ret = xfrm4_net_sysctl_init(net);
365 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
370 static void __net_exit xfrm4_net_exit(struct net *net)
372 xfrm4_net_sysctl_exit(net);
373 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
376 static struct pernet_operations __net_initdata xfrm4_net_ops = {
377 .init = xfrm4_net_init,
378 .exit = xfrm4_net_exit,
381 static void __init xfrm4_policy_init(void)
383 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
386 void __init xfrm4_init(void)
390 xfrm4_protocol_init();
391 register_pernet_subsys(&xfrm4_net_ops);