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>
20 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
22 static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
24 const xfrm_address_t *saddr,
25 const xfrm_address_t *daddr)
29 memset(fl4, 0, sizeof(*fl4));
30 fl4->daddr = daddr->a4;
31 fl4->flowi4_tos = tos;
32 fl4->flowi4_oif = oif;
34 fl4->saddr = saddr->a4;
36 fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
38 rt = __ip_route_output_key(net, fl4);
45 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
46 const xfrm_address_t *saddr,
47 const xfrm_address_t *daddr)
51 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
54 static int xfrm4_get_saddr(struct net *net, int oif,
55 xfrm_address_t *saddr, xfrm_address_t *daddr)
57 struct dst_entry *dst;
60 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
64 saddr->a4 = fl4.saddr;
69 static int xfrm4_get_tos(const struct flowi *fl)
71 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
74 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
80 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
81 const struct flowi *fl)
83 struct rtable *rt = (struct rtable *)xdst->route;
84 const struct flowi4 *fl4 = &fl->u.ip4;
86 xdst->u.rt.rt_iif = fl4->flowi4_iif;
88 xdst->u.dst.dev = dev;
91 /* Sheit... I remember I did this right. Apparently,
92 * it was magically lost, so this code needs audit */
93 xdst->u.rt.rt_is_input = rt->rt_is_input;
94 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
96 xdst->u.rt.rt_type = rt->rt_type;
97 xdst->u.rt.rt_gateway = rt->rt_gateway;
98 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
99 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
100 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
106 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
108 const struct iphdr *iph = ip_hdr(skb);
109 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
110 struct flowi4 *fl4 = &fl->u.ip4;
114 oif = vrf_master_ifindex(skb_dst(skb)->dev) ?
115 : skb_dst(skb)->dev->ifindex;
118 memset(fl4, 0, sizeof(struct flowi4));
119 fl4->flowi4_mark = skb->mark;
120 fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
122 if (!ip_is_fragment(iph)) {
123 switch (iph->protocol) {
125 case IPPROTO_UDPLITE:
129 if (xprth + 4 < skb->data ||
130 pskb_may_pull(skb, xprth + 4 - skb->data)) {
131 __be16 *ports = (__be16 *)xprth;
133 fl4->fl4_sport = ports[!!reverse];
134 fl4->fl4_dport = ports[!reverse];
139 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
142 fl4->fl4_icmp_type = icmp[0];
143 fl4->fl4_icmp_code = icmp[1];
148 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
149 __be32 *ehdr = (__be32 *)xprth;
151 fl4->fl4_ipsec_spi = ehdr[0];
156 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
157 __be32 *ah_hdr = (__be32 *)xprth;
159 fl4->fl4_ipsec_spi = ah_hdr[1];
164 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
165 __be16 *ipcomp_hdr = (__be16 *)xprth;
167 fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
172 if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
173 __be16 *greflags = (__be16 *)xprth;
174 __be32 *gre_hdr = (__be32 *)xprth;
176 if (greflags[0] & GRE_KEY) {
177 if (greflags[0] & GRE_CSUM)
179 fl4->fl4_gre_key = gre_hdr[1];
185 fl4->fl4_ipsec_spi = 0;
189 fl4->flowi4_proto = iph->protocol;
190 fl4->daddr = reverse ? iph->saddr : iph->daddr;
191 fl4->saddr = reverse ? iph->daddr : iph->saddr;
192 fl4->flowi4_tos = iph->tos;
195 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
197 struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
199 xfrm4_policy_afinfo.garbage_collect(net);
200 return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
203 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
204 struct sk_buff *skb, u32 mtu)
206 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
207 struct dst_entry *path = xdst->route;
209 path->ops->update_pmtu(path, sk, skb, mtu);
212 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
215 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
216 struct dst_entry *path = xdst->route;
218 path->ops->redirect(path, sk, skb);
221 static void xfrm4_dst_destroy(struct dst_entry *dst)
223 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
225 dst_destroy_metrics_generic(dst);
227 xfrm_dst_destroy(xdst);
230 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
236 xfrm_dst_ifdown(dst, dev);
239 static struct dst_ops xfrm4_dst_ops = {
241 .gc = xfrm4_garbage_collect,
242 .update_pmtu = xfrm4_update_pmtu,
243 .redirect = xfrm4_redirect,
244 .cow_metrics = dst_cow_metrics_generic,
245 .destroy = xfrm4_dst_destroy,
246 .ifdown = xfrm4_dst_ifdown,
247 .local_out = __ip_local_out,
251 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
253 .dst_ops = &xfrm4_dst_ops,
254 .dst_lookup = xfrm4_dst_lookup,
255 .get_saddr = xfrm4_get_saddr,
256 .decode_session = _decode_session4,
257 .get_tos = xfrm4_get_tos,
258 .init_path = xfrm4_init_path,
259 .fill_dst = xfrm4_fill_dst,
260 .blackhole_route = ipv4_blackhole_route,
264 static struct ctl_table xfrm4_policy_table[] = {
266 .procname = "xfrm4_gc_thresh",
267 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
268 .maxlen = sizeof(int),
270 .proc_handler = proc_dointvec,
275 static int __net_init xfrm4_net_init(struct net *net)
277 struct ctl_table *table;
278 struct ctl_table_header *hdr;
280 table = xfrm4_policy_table;
281 if (!net_eq(net, &init_net)) {
282 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
286 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
289 hdr = register_net_sysctl(net, "net/ipv4", table);
293 net->ipv4.xfrm4_hdr = hdr;
297 if (!net_eq(net, &init_net))
303 static void __net_exit xfrm4_net_exit(struct net *net)
305 struct ctl_table *table;
307 if (!net->ipv4.xfrm4_hdr)
310 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
311 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
312 if (!net_eq(net, &init_net))
316 static struct pernet_operations __net_initdata xfrm4_net_ops = {
317 .init = xfrm4_net_init,
318 .exit = xfrm4_net_exit,
322 static void __init xfrm4_policy_init(void)
324 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
327 void __init xfrm4_init(void)
329 dst_entries_init(&xfrm4_dst_ops);
333 xfrm4_protocol_init();
335 register_pernet_subsys(&xfrm4_net_ops);