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From: Todd Seidelmann <tseidelmann@linode.com>
To: netfilter-devel@vger.kernel.org
Subject: [PATCH nf] netfilter: ebtables: Fix argument order to ADD_COUNTER
Date: Tue, 13 Aug 2019 09:22:17 -0400	[thread overview]
Message-ID: <0330b679-4649-df92-f0d7-a0b5c7dcc87d@linode.com> (raw)

The ordering of arguments to the x_tables ADD_COUNTER macro
appears to be wrong in ebtables (cf. ip_tables.c, ip6_tables.c,
and arp_tables.c).

This causes data corruption in the ebtables userspace tools
because they get incorrect packet & byte counts from the kernel.
---
  net/bridge/netfilter/ebtables.c | 8 ++++----
  1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c 
b/net/bridge/netfilter/ebtables.c
index c8177a8..4096d8a 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -221,7 +221,7 @@ unsigned int ebt_do_table(struct sk_buff *skb,
              return NF_DROP;
          }

-        ADD_COUNTER(*(counter_base + i), 1, skb->len);
+        ADD_COUNTER(*(counter_base + i), skb->len, 1);

          /* these should only watch: not modify, nor tell us
           * what to do with the packet
@@ -959,8 +959,8 @@ static void get_counters(const struct ebt_counter 
*oldcounters,
              continue;
          counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
          for (i = 0; i < nentries; i++)
-            ADD_COUNTER(counters[i], counter_base[i].pcnt,
-                    counter_base[i].bcnt);
+            ADD_COUNTER(counters[i], counter_base[i].bcnt,
+                    counter_base[i].pcnt);
      }
  }

@@ -1280,7 +1280,7 @@ static int do_update_counters(struct net *net, 
const char *name,

      /* we add to the counters of the first cpu */
      for (i = 0; i < num_counters; i++)
-        ADD_COUNTER(t->private->counters[i], tmp[i].pcnt, tmp[i].bcnt);
+        ADD_COUNTER(t->private->counters[i], tmp[i].bcnt, tmp[i].pcnt);

      write_unlock_bh(&t->lock);
      ret = 0;
--
1.8.3.1


             reply	other threads:[~2019-08-13 13:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13 13:22 Todd Seidelmann [this message]
2019-08-13 13:29 ` [PATCH nf] netfilter: ebtables: Fix argument order to ADD_COUNTER Florian Westphal
  -- strict thread matches above, loose matches on Subject: below --
2019-08-14 14:54 Todd Seidelmann
2019-08-14 14:54 ` Florian Westphal
2019-08-19 10:49 ` Pablo Neira Ayuso

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