2 * xfrm6_policy.c: based on xfrm4_policy.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * Split up af-specific portion
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <net/addrconf.h>
22 #include <net/ip6_route.h>
23 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
27 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
29 static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
30 const xfrm_address_t *saddr,
31 const xfrm_address_t *daddr)
34 struct dst_entry *dst;
37 memset(&fl6, 0, sizeof(fl6));
38 memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
40 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
42 dst = ip6_route_output(net, NULL, &fl6);
53 static int xfrm6_get_saddr(struct net *net,
54 xfrm_address_t *saddr, xfrm_address_t *daddr)
56 struct dst_entry *dst;
57 struct net_device *dev;
59 dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
63 dev = ip6_dst_idev(dst)->dev;
64 ipv6_dev_get_saddr(dev_net(dev), dev,
65 (struct in6_addr *)&daddr->a6, 0,
66 (struct in6_addr *)&saddr->a6);
71 static int xfrm6_get_tos(const struct flowi *fl)
76 static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
79 if (dst->ops->family == AF_INET6) {
80 struct rt6_info *rt = (struct rt6_info*)dst;
82 path->path_cookie = rt->rt6i_node->fn_sernum;
85 path->u.rt6.rt6i_nfheader_len = nfheader_len;
90 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
91 const struct flowi *fl)
93 struct rt6_info *rt = (struct rt6_info*)xdst->route;
95 xdst->u.dst.dev = dev;
98 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
99 if (!xdst->u.rt6.rt6i_idev)
102 xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
104 atomic_inc(&rt->rt6i_peer->refcnt);
106 /* Sheit... I remember I did this right. Apparently,
107 * it was magically lost, so this code needs audit */
108 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
110 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
111 xdst->u.rt6.rt6i_node = rt->rt6i_node;
113 xdst->route_cookie = rt->rt6i_node->fn_sernum;
114 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
115 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
116 xdst->u.rt6.rt6i_src = rt->rt6i_src;
122 _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
124 struct flowi6 *fl6 = &fl->u.ip6;
126 u16 offset = skb_network_header_len(skb);
127 struct ipv6hdr *hdr = ipv6_hdr(skb);
128 struct ipv6_opt_hdr *exthdr;
129 const unsigned char *nh = skb_network_header(skb);
130 u8 nexthdr = nh[IP6CB(skb)->nhoff];
132 memset(fl6, 0, sizeof(struct flowi6));
133 fl6->flowi6_mark = skb->mark;
135 ipv6_addr_copy(&fl6->daddr, reverse ? &hdr->saddr : &hdr->daddr);
136 ipv6_addr_copy(&fl6->saddr, reverse ? &hdr->daddr : &hdr->saddr);
138 while (nh + offset + 1 < skb->data ||
139 pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
140 nh = skb_network_header(skb);
141 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
144 case NEXTHDR_FRAGMENT:
146 case NEXTHDR_ROUTING:
149 offset += ipv6_optlen(exthdr);
150 nexthdr = exthdr->nexthdr;
151 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
155 case IPPROTO_UDPLITE:
159 if (!onlyproto && (nh + offset + 4 < skb->data ||
160 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
161 __be16 *ports = (__be16 *)exthdr;
163 fl6->uli.ports.sport = ports[!!reverse];
164 fl6->uli.ports.dport = ports[!reverse];
166 fl6->flowi6_proto = nexthdr;
170 if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
171 u8 *icmp = (u8 *)exthdr;
173 fl6->uli.icmpt.type = icmp[0];
174 fl6->uli.icmpt.code = icmp[1];
176 fl6->flowi6_proto = nexthdr;
179 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
181 if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
183 mh = (struct ip6_mh *)exthdr;
185 fl6->uli.mht.type = mh->ip6mh_type;
187 fl6->flowi6_proto = nexthdr;
191 /* XXX Why are there these headers? */
197 fl6->flowi6_proto = nexthdr;
203 static inline int xfrm6_garbage_collect(struct dst_ops *ops)
205 struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
207 xfrm6_policy_afinfo.garbage_collect(net);
208 return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
211 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
213 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
214 struct dst_entry *path = xdst->route;
216 path->ops->update_pmtu(path, mtu);
219 static void xfrm6_dst_destroy(struct dst_entry *dst)
221 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
223 if (likely(xdst->u.rt6.rt6i_idev))
224 in6_dev_put(xdst->u.rt6.rt6i_idev);
225 dst_destroy_metrics_generic(dst);
226 if (likely(xdst->u.rt6.rt6i_peer))
227 inet_putpeer(xdst->u.rt6.rt6i_peer);
228 xfrm_dst_destroy(xdst);
231 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
234 struct xfrm_dst *xdst;
239 xdst = (struct xfrm_dst *)dst;
240 if (xdst->u.rt6.rt6i_idev->dev == dev) {
241 struct inet6_dev *loopback_idev =
242 in6_dev_get(dev_net(dev)->loopback_dev);
243 BUG_ON(!loopback_idev);
246 in6_dev_put(xdst->u.rt6.rt6i_idev);
247 xdst->u.rt6.rt6i_idev = loopback_idev;
248 in6_dev_hold(loopback_idev);
249 xdst = (struct xfrm_dst *)xdst->u.dst.child;
250 } while (xdst->u.dst.xfrm);
252 __in6_dev_put(loopback_idev);
255 xfrm_dst_ifdown(dst, dev);
258 static struct dst_ops xfrm6_dst_ops = {
260 .protocol = cpu_to_be16(ETH_P_IPV6),
261 .gc = xfrm6_garbage_collect,
262 .update_pmtu = xfrm6_update_pmtu,
263 .cow_metrics = dst_cow_metrics_generic,
264 .destroy = xfrm6_dst_destroy,
265 .ifdown = xfrm6_dst_ifdown,
266 .local_out = __ip6_local_out,
270 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
272 .dst_ops = &xfrm6_dst_ops,
273 .dst_lookup = xfrm6_dst_lookup,
274 .get_saddr = xfrm6_get_saddr,
275 .decode_session = _decode_session6,
276 .get_tos = xfrm6_get_tos,
277 .init_path = xfrm6_init_path,
278 .fill_dst = xfrm6_fill_dst,
279 .blackhole_route = ip6_blackhole_route,
282 static int __init xfrm6_policy_init(void)
284 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
287 static void xfrm6_policy_fini(void)
289 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
293 static struct ctl_table xfrm6_policy_table[] = {
295 .procname = "xfrm6_gc_thresh",
296 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
297 .maxlen = sizeof(int),
299 .proc_handler = proc_dointvec,
304 static struct ctl_table_header *sysctl_hdr;
307 int __init xfrm6_init(void)
310 unsigned int gc_thresh;
313 * We need a good default value for the xfrm6 gc threshold.
314 * In ipv4 we set it to the route hash table size * 8, which
315 * is half the size of the maximaum route cache for ipv4. It
316 * would be good to do the same thing for v6, except the table is
317 * constructed differently here. Here each table for a net namespace
318 * can have FIB_TABLE_HASHSZ entries, so lets go with the same
319 * computation that we used for ipv4 here. Also, lets keep the initial
320 * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
321 * to that as a minimum as well
323 gc_thresh = FIB6_TABLE_HASHSZ * 8;
324 xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
325 dst_entries_init(&xfrm6_dst_ops);
327 ret = xfrm6_policy_init();
329 dst_entries_destroy(&xfrm6_dst_ops);
332 ret = xfrm6_state_init();
337 sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
347 void xfrm6_fini(void)
351 unregister_net_sysctl_table(sysctl_hdr);
353 //xfrm6_input_fini();
356 dst_entries_destroy(&xfrm6_dst_ops);