From: Florian Westphal fw@strlen.de
stable inclusion from linux-4.19.226 commit 519f563eca1b89965dd406a8f9807ca76562d202
--------------------------------
[ Upstream commit 28b78ecffea8078d81466b2e01bb5a154509f1ba ]
This makes 'bridge-nf-filter-pppoe-tagged' sysctl work for bridged traffic.
Looking at the original commit it doesn't appear this ever worked:
static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, [..] if (skb->protocol == htons(ETH_P_8021Q)) { skb_pull(skb, VLAN_HLEN); skb->network_header += VLAN_HLEN; + } else if (skb->protocol == htons(ETH_P_PPP_SES)) { + skb_pull(skb, PPPOE_SES_HLEN); + skb->network_header += PPPOE_SES_HLEN; } [..] NF_HOOK(... POST_ROUTING, ...)
... but the adjusted offsets are never restored.
The alternative would be to rip this code out for good, but otoh we'd have to keep this anyway for the vlan handling (which works because vlan tag info is in the skb, not the packet payload).
Reported-and-tested-by: Amish Chana amish@3g.co.za Fixes: 516299d2f5b6f97 ("[NETFILTER]: bridge-nf: filter bridged IPv4/IPv6 encapsulated in pppoe traffic") Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- net/bridge/br_netfilter_hooks.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c index a403179eea49..fd5e3470560a 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -727,6 +727,9 @@ static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff if (nf_bridge->frag_max_size && nf_bridge->frag_max_size < mtu) mtu = nf_bridge->frag_max_size;
+ nf_bridge_update_protocol(skb); + nf_bridge_push_encap_header(skb); + if (skb_is_gso(skb) || skb->len + mtu_reserved <= mtu) { nf_bridge_info_free(skb); return br_dev_queue_push_xmit(net, sk, skb); @@ -744,8 +747,6 @@ static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff
IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
- nf_bridge_update_protocol(skb); - data = this_cpu_ptr(&brnf_frag_data_storage);
data->vlan_tci = skb->vlan_tci; @@ -768,8 +769,6 @@ static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff
IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size;
- nf_bridge_update_protocol(skb); - data = this_cpu_ptr(&brnf_frag_data_storage); data->encap_size = nf_bridge_encap_header_len(skb); data->size = ETH_HLEN + data->encap_size;