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 rt = __ip_route_output_key(net, fl4);
43 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
44 const xfrm_address_t *saddr,
45 const xfrm_address_t *daddr)
49 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
52 static int xfrm4_get_saddr(struct net *net, int oif,
53 xfrm_address_t *saddr, xfrm_address_t *daddr)
55 struct dst_entry *dst;
58 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
62 saddr->a4 = fl4.saddr;
67 static int xfrm4_get_tos(const struct flowi *fl)
69 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
72 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
78 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
79 const struct flowi *fl)
81 struct rtable *rt = (struct rtable *)xdst->route;
82 const struct flowi4 *fl4 = &fl->u.ip4;
84 xdst->u.rt.rt_iif = fl4->flowi4_iif;
86 xdst->u.dst.dev = dev;
89 /* Sheit... I remember I did this right. Apparently,
90 * it was magically lost, so this code needs audit */
91 xdst->u.rt.rt_is_input = rt->rt_is_input;
92 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
94 xdst->u.rt.rt_type = rt->rt_type;
95 xdst->u.rt.rt_gateway = rt->rt_gateway;
96 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
97 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
98 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
104 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
106 const struct iphdr *iph = ip_hdr(skb);
107 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
108 struct flowi4 *fl4 = &fl->u.ip4;
112 oif = vrf_master_ifindex(skb_dst(skb)->dev) ?
113 : skb_dst(skb)->dev->ifindex;
116 memset(fl4, 0, sizeof(struct flowi4));
117 fl4->flowi4_mark = skb->mark;
118 fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
120 if (!ip_is_fragment(iph)) {
121 switch (iph->protocol) {
123 case IPPROTO_UDPLITE:
127 if (xprth + 4 < skb->data ||
128 pskb_may_pull(skb, xprth + 4 - skb->data)) {
129 __be16 *ports = (__be16 *)xprth;
131 fl4->fl4_sport = ports[!!reverse];
132 fl4->fl4_dport = ports[!reverse];
137 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
140 fl4->fl4_icmp_type = icmp[0];
141 fl4->fl4_icmp_code = icmp[1];
146 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
147 __be32 *ehdr = (__be32 *)xprth;
149 fl4->fl4_ipsec_spi = ehdr[0];
154 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
155 __be32 *ah_hdr = (__be32 *)xprth;
157 fl4->fl4_ipsec_spi = ah_hdr[1];
162 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
163 __be16 *ipcomp_hdr = (__be16 *)xprth;
165 fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
170 if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
171 __be16 *greflags = (__be16 *)xprth;
172 __be32 *gre_hdr = (__be32 *)xprth;
174 if (greflags[0] & GRE_KEY) {
175 if (greflags[0] & GRE_CSUM)
177 fl4->fl4_gre_key = gre_hdr[1];
183 fl4->fl4_ipsec_spi = 0;
187 fl4->flowi4_proto = iph->protocol;
188 fl4->daddr = reverse ? iph->saddr : iph->daddr;
189 fl4->saddr = reverse ? iph->daddr : iph->saddr;
190 fl4->flowi4_tos = iph->tos;
193 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
195 struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
197 xfrm4_policy_afinfo.garbage_collect(net);
198 return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
201 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
202 struct sk_buff *skb, u32 mtu)
204 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
205 struct dst_entry *path = xdst->route;
207 path->ops->update_pmtu(path, sk, skb, mtu);
210 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
213 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
214 struct dst_entry *path = xdst->route;
216 path->ops->redirect(path, sk, skb);
219 static void xfrm4_dst_destroy(struct dst_entry *dst)
221 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
223 dst_destroy_metrics_generic(dst);
225 xfrm_dst_destroy(xdst);
228 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
234 xfrm_dst_ifdown(dst, dev);
237 static struct dst_ops xfrm4_dst_ops = {
239 .gc = xfrm4_garbage_collect,
240 .update_pmtu = xfrm4_update_pmtu,
241 .redirect = xfrm4_redirect,
242 .cow_metrics = dst_cow_metrics_generic,
243 .destroy = xfrm4_dst_destroy,
244 .ifdown = xfrm4_dst_ifdown,
245 .local_out = __ip_local_out,
249 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
251 .dst_ops = &xfrm4_dst_ops,
252 .dst_lookup = xfrm4_dst_lookup,
253 .get_saddr = xfrm4_get_saddr,
254 .decode_session = _decode_session4,
255 .get_tos = xfrm4_get_tos,
256 .init_path = xfrm4_init_path,
257 .fill_dst = xfrm4_fill_dst,
258 .blackhole_route = ipv4_blackhole_route,
262 static struct ctl_table xfrm4_policy_table[] = {
264 .procname = "xfrm4_gc_thresh",
265 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
266 .maxlen = sizeof(int),
268 .proc_handler = proc_dointvec,
273 static int __net_init xfrm4_net_init(struct net *net)
275 struct ctl_table *table;
276 struct ctl_table_header *hdr;
278 table = xfrm4_policy_table;
279 if (!net_eq(net, &init_net)) {
280 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
284 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
287 hdr = register_net_sysctl(net, "net/ipv4", table);
291 net->ipv4.xfrm4_hdr = hdr;
295 if (!net_eq(net, &init_net))
301 static void __net_exit xfrm4_net_exit(struct net *net)
303 struct ctl_table *table;
305 if (!net->ipv4.xfrm4_hdr)
308 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
309 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
310 if (!net_eq(net, &init_net))
314 static struct pernet_operations __net_initdata xfrm4_net_ops = {
315 .init = xfrm4_net_init,
316 .exit = xfrm4_net_exit,
320 static void __init xfrm4_policy_init(void)
322 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
325 void __init xfrm4_init(void)
327 dst_entries_init(&xfrm4_dst_ops);
331 xfrm4_protocol_init();
333 register_pernet_subsys(&xfrm4_net_ops);