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e53820de0f
For outbound transformation, bundle is checked whether it is suitable for current flow to be reused or not. In such IPv6 case as below, transformation may apply incorrect bundle for the flow instead of creating another bundle: - The policy selector has destination prefix length < 128 (Two or more addresses can be matched it) - Its bundle holds dst entry of default route whose prefix length < 128 (Previous traffic was used such route as next hop) - The policy and the bundle were used a transport mode state and this time flow address is not matched the bundled state. This issue is found by Mobile IPv6 usage to protect mobility signaling by IPsec, but it is not a Mobile IPv6 specific. This patch adds strict check to xfrm_bundle_ok() for each state mode and address when prefix length is less than 128. Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
321 lines
7.2 KiB
C
321 lines
7.2 KiB
C
/*
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* xfrm4_policy.c
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*
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* Changes:
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* Kazunori MIYAZAWA @USAGI
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* YOSHIFUJI Hideaki @USAGI
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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/inetdevice.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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static struct dst_ops xfrm4_dst_ops;
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static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
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static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
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{
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return __ip_route_output_key((struct rtable**)dst, fl);
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}
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static struct dst_entry *
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__xfrm4_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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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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if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
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xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
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xdst->u.rt.fl.fl4_src == fl->fl4_src &&
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xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
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xfrm_bundle_ok(xdst, fl, AF_INET, 0)) {
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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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__xfrm4_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 rtable *rt0 = (struct rtable*)(*dst_p);
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struct rtable *rt = rt0;
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u32 remote = fl->fl4_dst;
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u32 local = fl->fl4_src;
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struct flowi fl_tunnel = {
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.nl_u = {
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.ip4_u = {
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.saddr = local,
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.daddr = remote,
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.tos = fl->fl4_tos
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}
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}
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};
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int i;
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int err;
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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(&xfrm4_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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dst1->next = dst_prev;
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dst_prev = dst1;
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if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
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remote = xfrm[i]->id.daddr.a4;
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local = xfrm[i]->props.saddr.a4;
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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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fl_tunnel.fl4_src = local;
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fl_tunnel.fl4_dst = remote;
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err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
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&fl_tunnel, AF_INET);
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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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*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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x->u.rt.fl = *fl;
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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->nfheader_len = 0;
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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 neighbout 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 = xfrm4_output;
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if (rt->peer)
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atomic_inc(&rt->peer->refcnt);
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x->u.rt.peer = rt->peer;
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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.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
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x->u.rt.rt_type = rt->rt_type;
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x->u.rt.rt_src = rt0->rt_src;
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x->u.rt.rt_dst = rt0->rt_dst;
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x->u.rt.rt_gateway = rt->rt_gateway;
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x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
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x->u.rt.idev = rt0->idev;
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in_dev_hold(rt0->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 void
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_decode_session4(struct sk_buff *skb, struct flowi *fl)
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{
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struct iphdr *iph = skb->nh.iph;
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u8 *xprth = skb->nh.raw + iph->ihl*4;
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memset(fl, 0, sizeof(struct flowi));
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if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
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switch (iph->protocol) {
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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, xprth + 4 - skb->data)) {
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u16 *ports = (u16 *)xprth;
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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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break;
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case IPPROTO_ICMP:
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if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
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u8 *icmp = xprth;
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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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break;
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case IPPROTO_ESP:
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if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
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u32 *ehdr = (u32 *)xprth;
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fl->fl_ipsec_spi = ehdr[0];
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}
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break;
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case IPPROTO_AH:
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if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
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u32 *ah_hdr = (u32*)xprth;
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fl->fl_ipsec_spi = ah_hdr[1];
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}
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break;
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case IPPROTO_COMP:
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if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
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u16 *ipcomp_hdr = (u16 *)xprth;
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fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
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}
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break;
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default:
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fl->fl_ipsec_spi = 0;
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break;
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};
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}
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fl->proto = iph->protocol;
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fl->fl4_dst = iph->daddr;
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fl->fl4_src = iph->saddr;
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fl->fl4_tos = iph->tos;
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}
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static inline int xfrm4_garbage_collect(void)
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{
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xfrm4_policy_afinfo.garbage_collect();
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return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
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}
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static void xfrm4_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 xfrm4_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.rt.idev))
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in_dev_put(xdst->u.rt.idev);
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xfrm_dst_destroy(xdst);
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}
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static void xfrm4_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.rt.idev->dev == dev) {
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struct in_device *loopback_idev = in_dev_get(&loopback_dev);
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BUG_ON(!loopback_idev);
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do {
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in_dev_put(xdst->u.rt.idev);
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xdst->u.rt.idev = loopback_idev;
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in_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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__in_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 xfrm4_dst_ops = {
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.family = AF_INET,
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.protocol = __constant_htons(ETH_P_IP),
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.gc = xfrm4_garbage_collect,
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.update_pmtu = xfrm4_update_pmtu,
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.destroy = xfrm4_dst_destroy,
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.ifdown = xfrm4_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 xfrm4_policy_afinfo = {
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.family = AF_INET,
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.dst_ops = &xfrm4_dst_ops,
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.dst_lookup = xfrm4_dst_lookup,
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.find_bundle = __xfrm4_find_bundle,
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.bundle_create = __xfrm4_bundle_create,
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.decode_session = _decode_session4,
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};
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static void __init xfrm4_policy_init(void)
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{
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xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
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}
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static void __exit xfrm4_policy_fini(void)
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{
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xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
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}
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void __init xfrm4_init(void)
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{
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xfrm4_state_init();
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xfrm4_policy_init();
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}
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