343 lines
8.3 KiB
C
343 lines
8.3 KiB
C
/*
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* xfrm6_policy.c: based on xfrm4_policy.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki
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* Split up af-specific portion
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*
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*/
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#include <linux/compiler.h>
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#include <linux/config.h>
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#include <linux/netdevice.h>
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#include <net/addrconf.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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static struct dst_ops xfrm6_dst_ops;
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };
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static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
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{
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int err = 0;
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*dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
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if (!*dst)
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err = -ENETUNREACH;
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return err;
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}
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static struct dst_entry *
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__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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{
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struct dst_entry *dst;
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/* Still not clear if we should set fl->fl6_{src,dst}... */
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read_lock_bh(&policy->lock);
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for (dst = policy->bundles; dst; dst = dst->next) {
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struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
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struct in6_addr fl_dst_prefix, fl_src_prefix;
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ipv6_addr_prefix(&fl_dst_prefix,
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&fl->fl6_dst,
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xdst->u.rt6.rt6i_dst.plen);
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ipv6_addr_prefix(&fl_src_prefix,
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&fl->fl6_src,
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xdst->u.rt6.rt6i_src.plen);
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if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
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ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
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xfrm_bundle_ok(xdst, fl, AF_INET6)) {
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dst_clone(dst);
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break;
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}
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}
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read_unlock_bh(&policy->lock);
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return dst;
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}
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/* Allocate chain of dst_entry's, attach known xfrm's, calculate
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* all the metrics... Shortly, bundle a bundle.
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*/
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static int
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__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
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struct flowi *fl, struct dst_entry **dst_p)
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{
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struct dst_entry *dst, *dst_prev;
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struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
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struct rt6_info *rt = rt0;
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struct in6_addr *remote = &fl->fl6_dst;
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struct in6_addr *local = &fl->fl6_src;
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struct flowi fl_tunnel = {
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.nl_u = {
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.ip6_u = {
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.saddr = *local,
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.daddr = *remote
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}
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}
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};
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int i;
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int err = 0;
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int header_len = 0;
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int trailer_len = 0;
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dst = dst_prev = NULL;
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dst_hold(&rt->u.dst);
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for (i = 0; i < nx; i++) {
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struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
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struct xfrm_dst *xdst;
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int tunnel = 0;
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if (unlikely(dst1 == NULL)) {
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err = -ENOBUFS;
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dst_release(&rt->u.dst);
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goto error;
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}
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if (!dst)
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dst = dst1;
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else {
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dst_prev->child = dst1;
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dst1->flags |= DST_NOHASH;
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dst_clone(dst1);
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}
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xdst = (struct xfrm_dst *)dst1;
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xdst->route = &rt->u.dst;
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if (rt->rt6i_node)
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xdst->route_cookie = rt->rt6i_node->fn_sernum;
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dst1->next = dst_prev;
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dst_prev = dst1;
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if (xfrm[i]->props.mode) {
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remote = (struct in6_addr*)&xfrm[i]->id.daddr;
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local = (struct in6_addr*)&xfrm[i]->props.saddr;
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tunnel = 1;
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}
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header_len += xfrm[i]->props.header_len;
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trailer_len += xfrm[i]->props.trailer_len;
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if (tunnel) {
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ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
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ipv6_addr_copy(&fl_tunnel.fl6_src, local);
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err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
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&fl_tunnel, AF_INET6);
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if (err)
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goto error;
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} else
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dst_hold(&rt->u.dst);
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}
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dst_prev->child = &rt->u.dst;
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dst->path = &rt->u.dst;
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if (rt->rt6i_node)
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((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
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*dst_p = dst;
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dst = dst_prev;
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dst_prev = *dst_p;
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i = 0;
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for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
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struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
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dst_prev->xfrm = xfrm[i++];
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dst_prev->dev = rt->u.dst.dev;
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if (rt->u.dst.dev)
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dev_hold(rt->u.dst.dev);
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dst_prev->obsolete = -1;
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dst_prev->flags |= DST_HOST;
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dst_prev->lastuse = jiffies;
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dst_prev->header_len = header_len;
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dst_prev->trailer_len = trailer_len;
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memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
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/* Copy neighbour for reachability confirmation */
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dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
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dst_prev->input = rt->u.dst.input;
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dst_prev->output = xfrm6_output;
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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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x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
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x->u.rt6.rt6i_metric = rt0->rt6i_metric;
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x->u.rt6.rt6i_node = rt0->rt6i_node;
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x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
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memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
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x->u.rt6.rt6i_dst = rt0->rt6i_dst;
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x->u.rt6.rt6i_src = rt0->rt6i_src;
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x->u.rt6.rt6i_idev = rt0->rt6i_idev;
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in6_dev_hold(rt0->rt6i_idev);
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header_len -= x->u.dst.xfrm->props.header_len;
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trailer_len -= x->u.dst.xfrm->props.trailer_len;
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}
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xfrm_init_pmtu(dst);
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return 0;
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error:
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if (dst)
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dst_free(dst);
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return err;
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}
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static inline void
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_decode_session6(struct sk_buff *skb, struct flowi *fl)
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{
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u16 offset = sizeof(struct ipv6hdr);
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struct ipv6hdr *hdr = skb->nh.ipv6h;
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
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u8 nexthdr = skb->nh.ipv6h->nexthdr;
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memset(fl, 0, sizeof(struct flowi));
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ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
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ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
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while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
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switch (nexthdr) {
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case NEXTHDR_ROUTING:
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case NEXTHDR_HOP:
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case NEXTHDR_DEST:
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offset += ipv6_optlen(exthdr);
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nexthdr = exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
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break;
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case IPPROTO_UDP:
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case IPPROTO_TCP:
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case IPPROTO_SCTP:
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case IPPROTO_DCCP:
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if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
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u16 *ports = (u16 *)exthdr;
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fl->fl_ip_sport = ports[0];
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fl->fl_ip_dport = ports[1];
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}
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fl->proto = nexthdr;
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return;
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case IPPROTO_ICMPV6:
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if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
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u8 *icmp = (u8 *)exthdr;
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fl->fl_icmp_type = icmp[0];
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fl->fl_icmp_code = icmp[1];
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}
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fl->proto = nexthdr;
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return;
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/* XXX Why are there these headers? */
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case IPPROTO_AH:
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case IPPROTO_ESP:
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case IPPROTO_COMP:
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default:
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fl->fl_ipsec_spi = 0;
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fl->proto = nexthdr;
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return;
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};
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}
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}
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static inline int xfrm6_garbage_collect(void)
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{
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read_lock(&xfrm6_policy_afinfo.lock);
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xfrm6_policy_afinfo.garbage_collect();
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read_unlock(&xfrm6_policy_afinfo.lock);
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return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
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}
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static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
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{
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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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}
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static void xfrm6_dst_destroy(struct dst_entry *dst)
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{
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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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xfrm_dst_destroy(xdst);
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}
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static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int unregister)
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{
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struct xfrm_dst *xdst;
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if (!unregister)
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return;
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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 = in6_dev_get(&loopback_dev);
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BUG_ON(!loopback_idev);
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do {
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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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}
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm6_dst_ops = {
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.family = AF_INET6,
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.protocol = __constant_htons(ETH_P_IPV6),
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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.destroy = xfrm6_dst_destroy,
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.ifdown = xfrm6_dst_ifdown,
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.gc_thresh = 1024,
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.entry_size = sizeof(struct xfrm_dst),
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};
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
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.family = AF_INET6,
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.lock = RW_LOCK_UNLOCKED,
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.type_map = &xfrm6_type_map,
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.dst_ops = &xfrm6_dst_ops,
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.dst_lookup = xfrm6_dst_lookup,
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.find_bundle = __xfrm6_find_bundle,
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.bundle_create = __xfrm6_bundle_create,
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.decode_session = _decode_session6,
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};
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static void __init xfrm6_policy_init(void)
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{
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xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
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}
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static void xfrm6_policy_fini(void)
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{
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xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
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}
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void __init xfrm6_init(void)
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{
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xfrm6_policy_init();
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xfrm6_state_init();
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}
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void xfrm6_fini(void)
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{
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//xfrm6_input_fini();
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xfrm6_policy_fini();
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xfrm6_state_fini();
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}
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