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 dst_ops xfrm6_dst_ops;
28 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
30 static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
31 xfrm_address_t *daddr)
34 struct dst_entry *dst;
37 memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
39 memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
41 dst = ip6_route_output(NULL, &fl);
52 static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
54 struct dst_entry *dst;
56 dst = xfrm6_dst_lookup(0, NULL, daddr);
60 ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
61 (struct in6_addr *)&saddr->a6);
66 static struct dst_entry *
67 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
69 struct dst_entry *dst;
71 /* Still not clear if we should set fl->fl6_{src,dst}... */
72 read_lock_bh(&policy->lock);
73 for (dst = policy->bundles; dst; dst = dst->next) {
74 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
75 struct in6_addr fl_dst_prefix, fl_src_prefix;
77 ipv6_addr_prefix(&fl_dst_prefix,
79 xdst->u.rt6.rt6i_dst.plen);
80 ipv6_addr_prefix(&fl_src_prefix,
82 xdst->u.rt6.rt6i_src.plen);
83 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
84 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
85 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
86 (xdst->u.rt6.rt6i_dst.plen != 128 ||
87 xdst->u.rt6.rt6i_src.plen != 128))) {
92 read_unlock_bh(&policy->lock);
96 static int xfrm6_get_tos(struct flowi *fl)
101 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
103 struct rt6_info *rt = (struct rt6_info*)xdst->route;
105 xdst->u.dst.dev = dev;
108 xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
109 if (!xdst->u.rt6.rt6i_idev)
112 /* Sheit... I remember I did this right. Apparently,
113 * it was magically lost, so this code needs audit */
114 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
116 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
117 xdst->u.rt6.rt6i_node = rt->rt6i_node;
118 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
119 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
120 xdst->u.rt6.rt6i_src = rt->rt6i_src;
126 _decode_session6(struct sk_buff *skb, struct flowi *fl)
128 u16 offset = skb_network_header_len(skb);
129 struct ipv6hdr *hdr = ipv6_hdr(skb);
130 struct ipv6_opt_hdr *exthdr;
131 const unsigned char *nh = skb_network_header(skb);
132 u8 nexthdr = nh[IP6CB(skb)->nhoff];
134 memset(fl, 0, sizeof(struct flowi));
135 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
136 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
138 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
139 nh = skb_network_header(skb);
140 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
143 case NEXTHDR_ROUTING:
146 offset += ipv6_optlen(exthdr);
147 nexthdr = exthdr->nexthdr;
148 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
152 case IPPROTO_UDPLITE:
156 if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
157 __be16 *ports = (__be16 *)exthdr;
159 fl->fl_ip_sport = ports[0];
160 fl->fl_ip_dport = ports[1];
166 if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
167 u8 *icmp = (u8 *)exthdr;
169 fl->fl_icmp_type = icmp[0];
170 fl->fl_icmp_code = icmp[1];
175 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
177 if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
179 mh = (struct ip6_mh *)exthdr;
181 fl->fl_mh_type = mh->ip6mh_type;
187 /* XXX Why are there these headers? */
192 fl->fl_ipsec_spi = 0;
199 static inline int xfrm6_garbage_collect(void)
201 xfrm6_policy_afinfo.garbage_collect();
202 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
205 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
207 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
208 struct dst_entry *path = xdst->route;
210 path->ops->update_pmtu(path, mtu);
213 static void xfrm6_dst_destroy(struct dst_entry *dst)
215 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
217 if (likely(xdst->u.rt6.rt6i_idev))
218 in6_dev_put(xdst->u.rt6.rt6i_idev);
219 xfrm_dst_destroy(xdst);
222 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
225 struct xfrm_dst *xdst;
230 xdst = (struct xfrm_dst *)dst;
231 if (xdst->u.rt6.rt6i_idev->dev == dev) {
232 struct inet6_dev *loopback_idev =
233 in6_dev_get(dev->nd_net->loopback_dev);
234 BUG_ON(!loopback_idev);
237 in6_dev_put(xdst->u.rt6.rt6i_idev);
238 xdst->u.rt6.rt6i_idev = loopback_idev;
239 in6_dev_hold(loopback_idev);
240 xdst = (struct xfrm_dst *)xdst->u.dst.child;
241 } while (xdst->u.dst.xfrm);
243 __in6_dev_put(loopback_idev);
246 xfrm_dst_ifdown(dst, dev);
249 static struct dst_ops xfrm6_dst_ops = {
251 .protocol = __constant_htons(ETH_P_IPV6),
252 .gc = xfrm6_garbage_collect,
253 .update_pmtu = xfrm6_update_pmtu,
254 .destroy = xfrm6_dst_destroy,
255 .ifdown = xfrm6_dst_ifdown,
256 .local_out = __ip6_local_out,
258 .entry_size = sizeof(struct xfrm_dst),
261 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
263 .dst_ops = &xfrm6_dst_ops,
264 .dst_lookup = xfrm6_dst_lookup,
265 .get_saddr = xfrm6_get_saddr,
266 .find_bundle = __xfrm6_find_bundle,
267 .decode_session = _decode_session6,
268 .get_tos = xfrm6_get_tos,
269 .fill_dst = xfrm6_fill_dst,
272 static void __init xfrm6_policy_init(void)
274 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
277 static void xfrm6_policy_fini(void)
279 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
282 void __init xfrm6_init(void)
288 void xfrm6_fini(void)
290 //xfrm6_input_fini();