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* xfrm6_policy.c: based on xfrm4_policy.c
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* Split up af-specific portion
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
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const xfrm_address_t *saddr,
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const xfrm_address_t *daddr)
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struct dst_entry *dst;
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memset(&fl6, 0, sizeof(fl6));
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memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
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memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
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dst = ip6_route_output(net, NULL, &fl6);
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static int xfrm6_get_saddr(struct net *net,
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xfrm_address_t *saddr, xfrm_address_t *daddr)
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struct dst_entry *dst;
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struct net_device *dev;
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dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
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dev = ip6_dst_idev(dst)->dev;
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ipv6_dev_get_saddr(dev_net(dev), dev,
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(struct in6_addr *)&daddr->a6, 0,
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(struct in6_addr *)&saddr->a6);
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static int xfrm6_get_tos(const struct flowi *fl)
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static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
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if (dst->ops->family == AF_INET6) {
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struct rt6_info *rt = (struct rt6_info*)dst;
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path->path_cookie = rt->rt6i_node->fn_sernum;
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path->u.rt6.rt6i_nfheader_len = nfheader_len;
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static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
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const struct flowi *fl)
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struct rt6_info *rt = (struct rt6_info*)xdst->route;
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xdst->u.dst.dev = dev;
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xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
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if (!xdst->u.rt6.rt6i_idev)
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xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
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atomic_inc(&rt->rt6i_peer->refcnt);
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/* Sheit... I remember I did this right. Apparently,
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* it was magically lost, so this code needs audit */
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xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
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xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
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xdst->u.rt6.rt6i_node = rt->rt6i_node;
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xdst->route_cookie = rt->rt6i_node->fn_sernum;
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xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
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xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
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xdst->u.rt6.rt6i_src = rt->rt6i_src;
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_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
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struct flowi6 *fl6 = &fl->u.ip6;
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u16 offset = skb_network_header_len(skb);
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const struct ipv6hdr *hdr = ipv6_hdr(skb);
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struct ipv6_opt_hdr *exthdr;
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const unsigned char *nh = skb_network_header(skb);
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u8 nexthdr = nh[IP6CB(skb)->nhoff];
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memset(fl6, 0, sizeof(struct flowi6));
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fl6->flowi6_mark = skb->mark;
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ipv6_addr_copy(&fl6->daddr, reverse ? &hdr->saddr : &hdr->daddr);
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ipv6_addr_copy(&fl6->saddr, reverse ? &hdr->daddr : &hdr->saddr);
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while (nh + offset + 1 < skb->data ||
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pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
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nh = skb_network_header(skb);
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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case NEXTHDR_FRAGMENT:
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case NEXTHDR_ROUTING:
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offset += ipv6_optlen(exthdr);
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nexthdr = exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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case IPPROTO_UDPLITE:
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if (!onlyproto && (nh + offset + 4 < skb->data ||
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pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
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__be16 *ports = (__be16 *)exthdr;
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fl6->fl6_sport = ports[!!reverse];
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fl6->fl6_dport = ports[!reverse];
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fl6->flowi6_proto = nexthdr;
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if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
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u8 *icmp = (u8 *)exthdr;
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fl6->fl6_icmp_type = icmp[0];
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fl6->fl6_icmp_code = icmp[1];
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fl6->flowi6_proto = nexthdr;
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
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mh = (struct ip6_mh *)exthdr;
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fl6->fl6_mh_type = mh->ip6mh_type;
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fl6->flowi6_proto = nexthdr;
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/* XXX Why are there these headers? */
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fl6->fl6_ipsec_spi = 0;
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fl6->flowi6_proto = nexthdr;
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static inline int xfrm6_garbage_collect(struct dst_ops *ops)
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struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
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xfrm6_policy_afinfo.garbage_collect(net);
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return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
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static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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struct dst_entry *path = xdst->route;
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path->ops->update_pmtu(path, mtu);
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static void xfrm6_dst_destroy(struct dst_entry *dst)
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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if (likely(xdst->u.rt6.rt6i_idev))
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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dst_destroy_metrics_generic(dst);
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if (likely(xdst->u.rt6.rt6i_peer))
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inet_putpeer(xdst->u.rt6.rt6i_peer);
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xfrm_dst_destroy(xdst);
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static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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struct xfrm_dst *xdst;
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xdst = (struct xfrm_dst *)dst;
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if (xdst->u.rt6.rt6i_idev->dev == dev) {
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struct inet6_dev *loopback_idev =
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in6_dev_get(dev_net(dev)->loopback_dev);
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BUG_ON(!loopback_idev);
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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xdst->u.rt6.rt6i_idev = loopback_idev;
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in6_dev_hold(loopback_idev);
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xdst = (struct xfrm_dst *)xdst->u.dst.child;
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} while (xdst->u.dst.xfrm);
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__in6_dev_put(loopback_idev);
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xfrm_dst_ifdown(dst, dev);
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static struct dst_ops xfrm6_dst_ops = {
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.protocol = cpu_to_be16(ETH_P_IPV6),
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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.cow_metrics = dst_cow_metrics_generic,
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.destroy = xfrm6_dst_destroy,
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.ifdown = xfrm6_dst_ifdown,
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.local_out = __ip6_local_out,
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
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.dst_ops = &xfrm6_dst_ops,
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.dst_lookup = xfrm6_dst_lookup,
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.get_saddr = xfrm6_get_saddr,
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.decode_session = _decode_session6,
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.get_tos = xfrm6_get_tos,
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.init_path = xfrm6_init_path,
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.fill_dst = xfrm6_fill_dst,
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.blackhole_route = ip6_blackhole_route,
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static int __init xfrm6_policy_init(void)
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return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
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static void xfrm6_policy_fini(void)
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xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
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static struct ctl_table xfrm6_policy_table[] = {
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.procname = "xfrm6_gc_thresh",
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.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
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.maxlen = sizeof(int),
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.proc_handler = proc_dointvec,
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static struct ctl_table_header *sysctl_hdr;
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int __init xfrm6_init(void)
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unsigned int gc_thresh;
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* We need a good default value for the xfrm6 gc threshold.
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* In ipv4 we set it to the route hash table size * 8, which
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* is half the size of the maximaum route cache for ipv4. It
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* would be good to do the same thing for v6, except the table is
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* constructed differently here. Here each table for a net namespace
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* can have FIB_TABLE_HASHSZ entries, so lets go with the same
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* computation that we used for ipv4 here. Also, lets keep the initial
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* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
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* to that as a minimum as well
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gc_thresh = FIB6_TABLE_HASHSZ * 8;
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xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
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dst_entries_init(&xfrm6_dst_ops);
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ret = xfrm6_policy_init();
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dst_entries_destroy(&xfrm6_dst_ops);
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ret = xfrm6_state_init();
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sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
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void xfrm6_fini(void)
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unregister_net_sysctl_table(sysctl_hdr);
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//xfrm6_input_fini();
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dst_entries_destroy(&xfrm6_dst_ops);