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;
32 fl4->saddr = saddr->a4;
34 rt = __ip_route_output_key(net, fl4);
41 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos,
42 const xfrm_address_t *saddr,
43 const xfrm_address_t *daddr)
47 return __xfrm4_dst_lookup(net, &fl4, tos, saddr, daddr);
50 static int xfrm4_get_saddr(struct net *net,
51 xfrm_address_t *saddr, xfrm_address_t *daddr)
53 struct dst_entry *dst;
56 dst = __xfrm4_dst_lookup(net, &fl4, 0, NULL, daddr);
60 saddr->a4 = fl4.saddr;
65 static int xfrm4_get_tos(const struct flowi *fl)
67 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
70 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
76 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
77 const struct flowi *fl)
79 struct rtable *rt = (struct rtable *)xdst->route;
80 const struct flowi4 *fl4 = &fl->u.ip4;
82 xdst->u.rt.rt_iif = fl4->flowi4_iif;
84 xdst->u.dst.dev = dev;
87 /* Sheit... I remember I did this right. Apparently,
88 * it was magically lost, so this code needs audit */
89 xdst->u.rt.rt_is_input = rt->rt_is_input;
90 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
92 xdst->u.rt.rt_type = rt->rt_type;
93 xdst->u.rt.rt_gateway = rt->rt_gateway;
94 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
95 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
96 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
102 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
104 const struct iphdr *iph = ip_hdr(skb);
105 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
106 struct flowi4 *fl4 = &fl->u.ip4;
108 memset(fl4, 0, sizeof(struct flowi4));
109 fl4->flowi4_mark = skb->mark;
110 fl4->flowi4_oif = skb_dst(skb)->dev->ifindex;
112 if (!ip_is_fragment(iph)) {
113 switch (iph->protocol) {
115 case IPPROTO_UDPLITE:
119 if (xprth + 4 < skb->data ||
120 pskb_may_pull(skb, xprth + 4 - skb->data)) {
121 __be16 *ports = (__be16 *)xprth;
123 fl4->fl4_sport = ports[!!reverse];
124 fl4->fl4_dport = ports[!reverse];
129 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
132 fl4->fl4_icmp_type = icmp[0];
133 fl4->fl4_icmp_code = icmp[1];
138 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
139 __be32 *ehdr = (__be32 *)xprth;
141 fl4->fl4_ipsec_spi = ehdr[0];
146 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
147 __be32 *ah_hdr = (__be32 *)xprth;
149 fl4->fl4_ipsec_spi = ah_hdr[1];
154 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
155 __be16 *ipcomp_hdr = (__be16 *)xprth;
157 fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
162 if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
163 __be16 *greflags = (__be16 *)xprth;
164 __be32 *gre_hdr = (__be32 *)xprth;
166 if (greflags[0] & GRE_KEY) {
167 if (greflags[0] & GRE_CSUM)
169 fl4->fl4_gre_key = gre_hdr[1];
175 fl4->fl4_ipsec_spi = 0;
179 fl4->flowi4_proto = iph->protocol;
180 fl4->daddr = reverse ? iph->saddr : iph->daddr;
181 fl4->saddr = reverse ? iph->daddr : iph->saddr;
182 fl4->flowi4_tos = iph->tos;
185 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
187 struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
189 xfrm4_policy_afinfo.garbage_collect(net);
190 return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
193 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
194 struct sk_buff *skb, u32 mtu)
196 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
197 struct dst_entry *path = xdst->route;
199 path->ops->update_pmtu(path, sk, skb, mtu);
202 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
205 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
206 struct dst_entry *path = xdst->route;
208 path->ops->redirect(path, sk, skb);
211 static void xfrm4_dst_destroy(struct dst_entry *dst)
213 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
215 dst_destroy_metrics_generic(dst);
217 xfrm_dst_destroy(xdst);
220 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
226 xfrm_dst_ifdown(dst, dev);
229 static struct dst_ops xfrm4_dst_ops = {
231 .protocol = cpu_to_be16(ETH_P_IP),
232 .gc = xfrm4_garbage_collect,
233 .update_pmtu = xfrm4_update_pmtu,
234 .redirect = xfrm4_redirect,
235 .cow_metrics = dst_cow_metrics_generic,
236 .destroy = xfrm4_dst_destroy,
237 .ifdown = xfrm4_dst_ifdown,
238 .local_out = __ip_local_out,
242 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
244 .dst_ops = &xfrm4_dst_ops,
245 .dst_lookup = xfrm4_dst_lookup,
246 .get_saddr = xfrm4_get_saddr,
247 .decode_session = _decode_session4,
248 .get_tos = xfrm4_get_tos,
249 .init_path = xfrm4_init_path,
250 .fill_dst = xfrm4_fill_dst,
251 .blackhole_route = ipv4_blackhole_route,
255 static struct ctl_table xfrm4_policy_table[] = {
257 .procname = "xfrm4_gc_thresh",
258 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
259 .maxlen = sizeof(int),
261 .proc_handler = proc_dointvec,
266 static int __net_init xfrm4_net_init(struct net *net)
268 struct ctl_table *table;
269 struct ctl_table_header *hdr;
271 table = xfrm4_policy_table;
272 if (!net_eq(net, &init_net)) {
273 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
277 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
280 hdr = register_net_sysctl(net, "net/ipv4", table);
284 net->ipv4.xfrm4_hdr = hdr;
288 if (!net_eq(net, &init_net))
294 static void __net_exit xfrm4_net_exit(struct net *net)
296 struct ctl_table *table;
298 if (net->ipv4.xfrm4_hdr == NULL)
301 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
302 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
303 if (!net_eq(net, &init_net))
307 static struct pernet_operations __net_initdata xfrm4_net_ops = {
308 .init = xfrm4_net_init,
309 .exit = xfrm4_net_exit,
313 static void __init xfrm4_policy_init(void)
315 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
318 void __init xfrm4_init(void)
320 dst_entries_init(&xfrm4_dst_ops);
325 register_pernet_subsys(&xfrm4_net_ops);