ppp: fix 'ppp_mp_reconstruct bad seq' errors

This patch fixes a (mostly cosmetic) bug introduced by the patch
'ppp: Use SKB queue abstraction interfaces in fragment processing'
found here: http://www.spinics.net/lists/netdev/msg153312.html

The above patch rewrote and moved the code responsible for cleaning
up discarded fragments but the new code does not catch every case
where this is necessary.  This results in some discarded fragments
remaining in the queue, and triggering a 'bad seq' error on the
subsequent call to ppp_mp_reconstruct.  Fragments are discarded
whenever other fragments of the same frame have been lost.
This can generate a lot of unwanted and misleading log messages.

This patch also adds additional detail to the debug logging to
make it clearer which fragments were lost and which other fragments
were discarded as a result of losses. (Run pppd with 'kdebug 1'
option to enable debug logging.)

Signed-off-by: Ben McKeegan <ben@netservers.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index edfa15d2e79501deabe2e3c3481378d1a8ac7bb7..486b4048850df8afca33d4183b436965b6a23137 100644 (file)
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -2024,14 +2024,22 @@ ppp_mp_reconstruct(struct ppp *ppp)
                        continue;
                }
                if (PPP_MP_CB(p)->sequence != seq) {
+                       u32 oldseq;
                        /* Fragment `seq' is missing.  If it is after
                           minseq, it might arrive later, so stop here. */
                        if (seq_after(seq, minseq))
                                break;
                        /* Fragment `seq' is lost, keep going. */
                        lost = 1;
+                       oldseq = seq;
                        seq = seq_before(minseq, PPP_MP_CB(p)->sequence)?
                                minseq + 1: PPP_MP_CB(p)->sequence;
+
+                       if (ppp->debug & 1)
+                               netdev_printk(KERN_DEBUG, ppp->dev,
+                                             "lost frag %u..%u\n",
+                                             oldseq, seq-1);
+
                        goto again;
                }
 
@@ -2076,6 +2084,10 @@ ppp_mp_reconstruct(struct ppp *ppp)
                        struct sk_buff *tmp2;
 
                        skb_queue_reverse_walk_from_safe(list, p, tmp2) {
+                               if (ppp->debug & 1)
+                                       netdev_printk(KERN_DEBUG, ppp->dev,
+                                                     "discarding frag %u\n",
+                                                     PPP_MP_CB(p)->sequence);
                                __skb_unlink(p, list);
                                kfree_skb(p);
                        }
@@ -2091,6 +2103,17 @@ ppp_mp_reconstruct(struct ppp *ppp)
                /* If we have discarded any fragments,
                   signal a receive error. */
                if (PPP_MP_CB(head)->sequence != ppp->nextseq) {
+                       skb_queue_walk_safe(list, p, tmp) {
+                               if (p == head)
+                                       break;
+                               if (ppp->debug & 1)
+                                       netdev_printk(KERN_DEBUG, ppp->dev,
+                                                     "discarding frag %u\n",
+                                                     PPP_MP_CB(p)->sequence);
+                               __skb_unlink(p, list);
+                               kfree_skb(p);
+                       }
+
                        if (ppp->debug & 1)
                                netdev_printk(KERN_DEBUG, ppp->dev,
                                              "  missed pkts %u..%u\n",