From 93fdd47e52f3f869a437319db9da1ea409acc07e Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 5 Oct 2014 12:00:22 +0800 Subject: bridge: Save frag_max_size between PRE_ROUTING and POST_ROUTING As we may defragment the packet in IPv4 PRE_ROUTING and refragment it after POST_ROUTING we should save the value of frag_max_size. This is still very wrong as the bridge is supposed to leave the packets intact, meaning that the right thing to do is to use the original frag_list for fragmentation. Unfortunately we don't currently guarantee that the frag_list is left untouched throughout netfilter so until this changes this is the best we can do. There is also a spot in FORWARD where it appears that we can forward a packet without going through fragmentation, mark it so that we can fix it later. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/bridge/br_netfilter.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'net/bridge/br_netfilter.c') diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c index a615264cf01a..4063898cf8aa 100644 --- a/net/bridge/br_netfilter.c +++ b/net/bridge/br_netfilter.c @@ -404,6 +404,7 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) ETH_HLEN-ETH_ALEN); /* tell br_dev_xmit to continue with forwarding */ nf_bridge->mask |= BRNF_BRIDGED_DNAT; + /* FIXME Need to refragment */ ret = neigh->output(neigh, skb); } neigh_release(neigh); @@ -459,6 +460,10 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb) struct nf_bridge_info *nf_bridge = skb->nf_bridge; struct rtable *rt; int err; + int frag_max_size; + + frag_max_size = IPCB(skb)->frag_max_size; + BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; if (nf_bridge->mask & BRNF_PKT_TYPE) { skb->pkt_type = PACKET_OTHERHOST; @@ -863,13 +868,19 @@ static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, static int br_nf_dev_queue_xmit(struct sk_buff *skb) { int ret; + int frag_max_size; + /* This is wrong! We should preserve the original fragment + * boundaries by preserving frag_list rather than refragmenting. + */ if (skb->protocol == htons(ETH_P_IP) && skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && !skb_is_gso(skb)) { + frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; if (br_parse_ip_options(skb)) /* Drop invalid packet */ return NF_DROP; + IPCB(skb)->frag_max_size = frag_max_size; ret = ip_fragment(skb, br_dev_queue_push_xmit); } else ret = br_dev_queue_push_xmit(skb); -- cgit v1.2.3-59-g8ed1b