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>
19 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
21 static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
23 const xfrm_address_t *saddr,
24 const xfrm_address_t *daddr)
28 memset(fl4, 0, sizeof(*fl4));
29 fl4->daddr = daddr->a4;
30 fl4->flowi4_tos = tos;
31 fl4->flowi4_oif = oif;
33 fl4->saddr = saddr->a4;
35 rt = __ip_route_output_key(net, fl4);
42 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
43 const xfrm_address_t *saddr,
44 const xfrm_address_t *daddr)
48 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
51 static int xfrm4_get_saddr(struct net *net, int oif,
52 xfrm_address_t *saddr, xfrm_address_t *daddr)
54 struct dst_entry *dst;
57 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
61 saddr->a4 = fl4.saddr;
66 static int xfrm4_get_tos(const struct flowi *fl)
68 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
71 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
77 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
78 const struct flowi *fl)
80 struct rtable *rt = (struct rtable *)xdst->route;
81 const struct flowi4 *fl4 = &fl->u.ip4;
83 xdst->u.rt.rt_iif = fl4->flowi4_iif;
85 xdst->u.dst.dev = dev;
88 /* Sheit... I remember I did this right. Apparently,
89 * it was magically lost, so this code needs audit */
90 xdst->u.rt.rt_is_input = rt->rt_is_input;
91 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
93 xdst->u.rt.rt_type = rt->rt_type;
94 xdst->u.rt.rt_gateway = rt->rt_gateway;
95 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
96 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
97 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
103 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
105 const struct iphdr *iph = ip_hdr(skb);
106 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
107 struct flowi4 *fl4 = &fl->u.ip4;
111 oif = skb_dst(skb)->dev->ifindex;
113 memset(fl4, 0, sizeof(struct flowi4));
114 fl4->flowi4_mark = skb->mark;
115 fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
117 if (!ip_is_fragment(iph)) {
118 switch (iph->protocol) {
120 case IPPROTO_UDPLITE:
124 if (xprth + 4 < skb->data ||
125 pskb_may_pull(skb, xprth + 4 - skb->data)) {
126 __be16 *ports = (__be16 *)xprth;
128 fl4->fl4_sport = ports[!!reverse];
129 fl4->fl4_dport = ports[!reverse];
134 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
137 fl4->fl4_icmp_type = icmp[0];
138 fl4->fl4_icmp_code = icmp[1];
143 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
144 __be32 *ehdr = (__be32 *)xprth;
146 fl4->fl4_ipsec_spi = ehdr[0];
151 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
152 __be32 *ah_hdr = (__be32 *)xprth;
154 fl4->fl4_ipsec_spi = ah_hdr[1];
159 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
160 __be16 *ipcomp_hdr = (__be16 *)xprth;
162 fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
167 if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
168 __be16 *greflags = (__be16 *)xprth;
169 __be32 *gre_hdr = (__be32 *)xprth;
171 if (greflags[0] & GRE_KEY) {
172 if (greflags[0] & GRE_CSUM)
174 fl4->fl4_gre_key = gre_hdr[1];
180 fl4->fl4_ipsec_spi = 0;
184 fl4->flowi4_proto = iph->protocol;
185 fl4->daddr = reverse ? iph->saddr : iph->daddr;
186 fl4->saddr = reverse ? iph->daddr : iph->saddr;
187 fl4->flowi4_tos = iph->tos;
190 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
192 struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
194 xfrm4_policy_afinfo.garbage_collect(net);
195 return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
198 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
199 struct sk_buff *skb, u32 mtu)
201 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
202 struct dst_entry *path = xdst->route;
204 path->ops->update_pmtu(path, sk, skb, mtu);
207 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
210 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
211 struct dst_entry *path = xdst->route;
213 path->ops->redirect(path, sk, skb);
216 static void xfrm4_dst_destroy(struct dst_entry *dst)
218 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
220 dst_destroy_metrics_generic(dst);
222 xfrm_dst_destroy(xdst);
225 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
231 xfrm_dst_ifdown(dst, dev);
234 static struct dst_ops xfrm4_dst_ops = {
236 .gc = xfrm4_garbage_collect,
237 .update_pmtu = xfrm4_update_pmtu,
238 .redirect = xfrm4_redirect,
239 .cow_metrics = dst_cow_metrics_generic,
240 .destroy = xfrm4_dst_destroy,
241 .ifdown = xfrm4_dst_ifdown,
242 .local_out = __ip_local_out,
246 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
248 .dst_ops = &xfrm4_dst_ops,
249 .dst_lookup = xfrm4_dst_lookup,
250 .get_saddr = xfrm4_get_saddr,
251 .decode_session = _decode_session4,
252 .get_tos = xfrm4_get_tos,
253 .init_path = xfrm4_init_path,
254 .fill_dst = xfrm4_fill_dst,
255 .blackhole_route = ipv4_blackhole_route,
259 static struct ctl_table xfrm4_policy_table[] = {
261 .procname = "xfrm4_gc_thresh",
262 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
263 .maxlen = sizeof(int),
265 .proc_handler = proc_dointvec,
270 static int __net_init xfrm4_net_init(struct net *net)
272 struct ctl_table *table;
273 struct ctl_table_header *hdr;
275 table = xfrm4_policy_table;
276 if (!net_eq(net, &init_net)) {
277 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
281 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
284 hdr = register_net_sysctl(net, "net/ipv4", table);
288 net->ipv4.xfrm4_hdr = hdr;
292 if (!net_eq(net, &init_net))
298 static void __net_exit xfrm4_net_exit(struct net *net)
300 struct ctl_table *table;
302 if (!net->ipv4.xfrm4_hdr)
305 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
306 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
307 if (!net_eq(net, &init_net))
311 static struct pernet_operations __net_initdata xfrm4_net_ops = {
312 .init = xfrm4_net_init,
313 .exit = xfrm4_net_exit,
317 static void __init xfrm4_policy_init(void)
319 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
322 void __init xfrm4_init(void)
324 dst_entries_init(&xfrm4_dst_ops);
328 xfrm4_protocol_init();
330 register_pernet_subsys(&xfrm4_net_ops);