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authorNicolas Cavallari <cavallar@lri.fr>2011-06-16 17:27:04 +0200
committerPatrick McHardy <kaber@trash.net>2011-06-16 17:27:04 +0200
commit2c38de4c1f8da799bdca0e4bb40ca13f2174d3e8 (patch)
treef4c30741b465cdca9f533c74d9694884186badf4 /net/netfilter
parentdb898aa2ef6529fa80891e754d353063611c77de (diff)
downloadlinux-2c38de4c1f8da799bdca0e4bb40ca13f2174d3e8.tar.bz2
netfilter: fix looped (broad|multi)cast's MAC handling
By default, when broadcast or multicast packet are sent from a local application, they are sent to the interface then looped by the kernel to other local applications, going throught netfilter hooks in the process. These looped packet have their MAC header removed from the skb by the kernel looping code. This confuse various netfilter's netlink queue, netlink log and the legacy ip_queue, because they try to extract a hardware address from these packets, but extracts a part of the IP header instead. This patch prevent NFQUEUE, NFLOG and ip_QUEUE to include a MAC header if there is none in the packet. Signed-off-by: Nicolas Cavallari <cavallar@lri.fr> Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nfnetlink_log.c3
-rw-r--r--net/netfilter/nfnetlink_queue.c3
2 files changed, 4 insertions, 2 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index e0ee010935e7..2e7ccbb43ddb 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -456,7 +456,8 @@ __build_packet_message(struct nfulnl_instance *inst,
if (skb->mark)
NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark));
- if (indev && skb->dev) {
+ if (indev && skb->dev &&
+ skb->mac_header != skb->network_header) {
struct nfulnl_msg_packet_hw phw;
int len = dev_parse_header(skb, phw.hw_addr);
if (len > 0) {
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index b83123f12b42..fdd2fafe0a14 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -335,7 +335,8 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
if (entskb->mark)
NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
- if (indev && entskb->dev) {
+ if (indev && entskb->dev &&
+ entskb->mac_header != entskb->network_header) {
struct nfqnl_msg_packet_hw phw;
int len = dev_parse_header(entskb, phw.hw_addr);
if (len) {