Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec

Steffen Klassert says:

====================
1) We used the wrong netlink attribute to verify the
   lenght of the replay window on async events. Fix this by
   using the right netlink attribute.

2) Policy lookups can not match the output interface on forwarding.
   Add the needed informations to the flow informations.

3) We update the pmtu when we receive a ICMPV6_DEST_UNREACH message
   on IPsec with ipv6. This is wrong and leads to strange fragmented
   packets, only ICMPV6_PKT_TOOBIG messages should update the pmtu.
   Fix this by removing the ICMPV6_DEST_UNREACH check from the IPsec
   protocol error handlers.

4) The legacy IPsec anti replay mechanism supports anti replay
   windows up to 32 packets. If a user requests for a bigger
   anti replay window, we use 32 packets but pretend that we use
   the requested window size. Fix from Fan Du.

5) If asynchronous events are enabled and replay_maxdiff is set to
   zero, we generate an async event for every received packet instead
   of checking whether a timeout occurred. Fix from Thomas Egerer.

6) Policies need a refcount when the state resolution timer is armed.
   Otherwise the timer can fire after the policy is deleted.

7) We might dreference a NULL pointer if the hold_queue is empty,
   add a check to avoid this.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

9 files changed, 59 insertions, 42 deletions

diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 9a459be24af7..ccde54248c8c 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -107,6 +107,7 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
 
         memset(fl4, 0, sizeof(struct flowi4));
         fl4->flowi4_mark = skb->mark;
+        fl4->flowi4_oif = skb_dst(skb)->dev->ifindex;
 
         if (!ip_is_fragment(iph)) {
                 switch (iph->protocol) {
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 73784c3d4642..82e1da3a40b9 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -618,8 +618,7 @@ static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
         struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset);
         struct xfrm_state *x;
 
-        if (type != ICMPV6_DEST_UNREACH &&
-            type != ICMPV6_PKT_TOOBIG &&
+        if (type != ICMPV6_PKT_TOOBIG &&
             type != NDISC_REDIRECT)
                 return;
 
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index d3618a78fcac..e67e63f9858d 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -436,8 +436,7 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
         struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
         struct xfrm_state *x;
 
-        if (type != ICMPV6_DEST_UNREACH &&
-            type != ICMPV6_PKT_TOOBIG &&
+        if (type != ICMPV6_PKT_TOOBIG &&
             type != NDISC_REDIRECT)
                 return;
 
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 5636a912074a..ce507d9e1c90 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -64,8 +64,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                 (struct ip_comp_hdr *)(skb->data + offset);
         struct xfrm_state *x;
 
-        if (type != ICMPV6_DEST_UNREACH &&
-            type != ICMPV6_PKT_TOOBIG &&
+        if (type != ICMPV6_PKT_TOOBIG &&
             type != NDISC_REDIRECT)
                 return;
 
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 23ed03d786c8..08ed2772b7aa 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -138,6 +138,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
 
         memset(fl6, 0, sizeof(struct flowi6));
         fl6->flowi6_mark = skb->mark;
+        fl6->flowi6_oif = skb_dst(skb)->dev->ifindex;
 
         fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
         fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 9d585370c5b4..911ef03bf8fb 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1098,7 +1098,8 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 
         x->id.proto = proto;
         x->id.spi = sa->sadb_sa_spi;
-        x->props.replay_window = sa->sadb_sa_replay;
+        x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
+                                        (sizeof(x->replay.bitmap) * 8));
         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
                 x->props.flags |= XFRM_STATE_NOECN;
         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index ed38d5d81f9e..76e1873811d4 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -334,7 +334,8 @@ static void xfrm_policy_kill(struct xfrm_policy *policy)
 
         atomic_inc(&policy->genid);
 
-        del_timer(&policy->polq.hold_timer);
+        if (del_timer(&policy->polq.hold_timer))
+                xfrm_pol_put(policy);
         xfrm_queue_purge(&policy->polq.hold_queue);
 
         if (del_timer(&policy->timer))
@@ -589,7 +590,8 @@ static void xfrm_policy_requeue(struct xfrm_policy *old,
 
         spin_lock_bh(&pq->hold_queue.lock);
         skb_queue_splice_init(&pq->hold_queue, &list);
-        del_timer(&pq->hold_timer);
+        if (del_timer(&pq->hold_timer))
+                xfrm_pol_put(old);
         spin_unlock_bh(&pq->hold_queue.lock);
 
         if (skb_queue_empty(&list))
@@ -600,7 +602,8 @@ static void xfrm_policy_requeue(struct xfrm_policy *old,
         spin_lock_bh(&pq->hold_queue.lock);
         skb_queue_splice(&list, &pq->hold_queue);
         pq->timeout = XFRM_QUEUE_TMO_MIN;
-        mod_timer(&pq->hold_timer, jiffies);
+        if (!mod_timer(&pq->hold_timer, jiffies))
+                xfrm_pol_hold(new);
         spin_unlock_bh(&pq->hold_queue.lock);
 }
 
@@ -1769,6 +1772,10 @@ static void xfrm_policy_queue_process(unsigned long arg)
 
         spin_lock(&pq->hold_queue.lock);
         skb = skb_peek(&pq->hold_queue);
+        if (!skb) {
+                spin_unlock(&pq->hold_queue.lock);
+                goto out;
+        }
         dst = skb_dst(skb);
         sk = skb->sk;
         xfrm_decode_session(skb, &fl, dst->ops->family);
@@ -1787,8 +1794,9 @@ static void xfrm_policy_queue_process(unsigned long arg)
                         goto purge_queue;
 
                 pq->timeout = pq->timeout << 1;
-                mod_timer(&pq->hold_timer, jiffies + pq->timeout);
-                return;
+                if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
+                        xfrm_pol_hold(pol);
+        goto out;
         }
 
         dst_release(dst);
@@ -1819,11 +1827,14 @@ static void xfrm_policy_queue_process(unsigned long arg)
                 err = dst_output(skb);
         }
 
+out:
+        xfrm_pol_put(pol);
         return;
 
 purge_queue:
         pq->timeout = 0;
         xfrm_queue_purge(&pq->hold_queue);
+        xfrm_pol_put(pol);
 }
 
 static int xdst_queue_output(struct sk_buff *skb)
@@ -1831,7 +1842,8 @@ static int xdst_queue_output(struct sk_buff *skb)
         unsigned long sched_next;
         struct dst_entry *dst = skb_dst(skb);
         struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
-        struct xfrm_policy_queue *pq = &xdst->pols[0]->polq;
+        struct xfrm_policy *pol = xdst->pols[0];
+        struct xfrm_policy_queue *pq = &pol->polq;
 
         if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
                 kfree_skb(skb);
@@ -1850,10 +1862,12 @@ static int xdst_queue_output(struct sk_buff *skb)
         if (del_timer(&pq->hold_timer)) {
                 if (time_before(pq->hold_timer.expires, sched_next))
                         sched_next = pq->hold_timer.expires;
+                xfrm_pol_put(pol);
         }
 
         __skb_queue_tail(&pq->hold_queue, skb);
-        mod_timer(&pq->hold_timer, sched_next);
+        if (!mod_timer(&pq->hold_timer, sched_next))
+                xfrm_pol_hold(pol);
 
         spin_unlock_bh(&pq->hold_queue.lock);
 
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 8dafe6d3c6e4..dab57daae408 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -61,9 +61,9 @@ static void xfrm_replay_notify(struct xfrm_state *x, int event)
 
         switch (event) {
         case XFRM_REPLAY_UPDATE:
-                if (x->replay_maxdiff &&
-                    (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
-                    (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
+                if (!x->replay_maxdiff ||
+                    ((x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
+                    (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))) {
                         if (x->xflags & XFRM_TIME_DEFER)
                                 event = XFRM_REPLAY_TIMEOUT;
                         else
@@ -129,8 +129,7 @@ static int xfrm_replay_check(struct xfrm_state *x,
                 return 0;
 
         diff = x->replay.seq - seq;
-        if (diff >= min_t(unsigned int, x->props.replay_window,
-                          sizeof(x->replay.bitmap) * 8)) {
+        if (diff >= x->props.replay_window) {
                 x->stats.replay_window++;
                 goto err;
         }
@@ -302,9 +301,10 @@ static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event)
 
         switch (event) {
         case XFRM_REPLAY_UPDATE:
-                if (x->replay_maxdiff &&
-                    (replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) &&
-                    (replay_esn->oseq - preplay_esn->oseq < x->replay_maxdiff)) {
+                if (!x->replay_maxdiff ||
+                    ((replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) &&
+                    (replay_esn->oseq - preplay_esn->oseq
+                     < x->replay_maxdiff))) {
                         if (x->xflags & XFRM_TIME_DEFER)
                                 event = XFRM_REPLAY_TIMEOUT;
                         else
@@ -353,28 +353,30 @@ static void xfrm_replay_notify_esn(struct xfrm_state *x, int event)
 
         switch (event) {
         case XFRM_REPLAY_UPDATE:
-                if (!x->replay_maxdiff)
-                        break;
-
-                if (replay_esn->seq_hi == preplay_esn->seq_hi)
-                        seq_diff = replay_esn->seq - preplay_esn->seq;
-                else
-                        seq_diff = ~preplay_esn->seq + replay_esn->seq + 1;
-
-                if (replay_esn->oseq_hi == preplay_esn->oseq_hi)
-                        oseq_diff = replay_esn->oseq - preplay_esn->oseq;
-                else
-                        oseq_diff = ~preplay_esn->oseq + replay_esn->oseq + 1;
-
-                if (seq_diff < x->replay_maxdiff &&
-                    oseq_diff < x->replay_maxdiff) {
+                if (x->replay_maxdiff) {
+                        if (replay_esn->seq_hi == preplay_esn->seq_hi)
+                                seq_diff = replay_esn->seq - preplay_esn->seq;
+                        else
+                                seq_diff = ~preplay_esn->seq + replay_esn->seq
+                                           + 1;
 
-                        if (x->xflags & XFRM_TIME_DEFER)
-                                event = XFRM_REPLAY_TIMEOUT;
+                        if (replay_esn->oseq_hi == preplay_esn->oseq_hi)
+                                oseq_diff = replay_esn->oseq
+                                            - preplay_esn->oseq;
                         else
-                                return;
+                                oseq_diff = ~preplay_esn->oseq
+                                            + replay_esn->oseq + 1;
+
+                        if (seq_diff >= x->replay_maxdiff ||
+                            oseq_diff >= x->replay_maxdiff)
+                                break;
                 }
 
+                if (x->xflags & XFRM_TIME_DEFER)
+                        event = XFRM_REPLAY_TIMEOUT;
+                else
+                        return;
+
                 break;
 
         case XFRM_REPLAY_TIMEOUT:
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 3f565e495ac6..f964d4c00ffb 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -446,7 +446,8 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
         memcpy(&x->sel, &p->sel, sizeof(x->sel));
         memcpy(&x->lft, &p->lft, sizeof(x->lft));
         x->props.mode = p->mode;
-        x->props.replay_window = p->replay_window;
+        x->props.replay_window = min_t(unsigned int, p->replay_window,
+                                        sizeof(x->replay.bitmap) * 8);
         x->props.reqid = p->reqid;
         x->props.family = p->family;
         memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
@@ -1856,7 +1857,7 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (x->km.state != XFRM_STATE_VALID)
                 goto out;
 
-        err = xfrm_replay_verify_len(x->replay_esn, rp);
+        err = xfrm_replay_verify_len(x->replay_esn, re);
         if (err)
                 goto out;