This adds the capability to conntrack 802.1ad, QinQ, PPPoE and PPPoE-in-Q packets that are passing a bridge.
Reviewed-by: Nikolay Aleksandrov razor@blackwall.org Signed-off-by: Eric Woudstra ericwouds@gmail.com --- net/bridge/netfilter/nf_conntrack_bridge.c | 83 ++++++++++++++++++---- 1 file changed, 71 insertions(+), 12 deletions(-)
diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c index 816bb0fde718..4b4e3751fb13 100644 --- a/net/bridge/netfilter/nf_conntrack_bridge.c +++ b/net/bridge/netfilter/nf_conntrack_bridge.c @@ -242,53 +242,112 @@ static unsigned int nf_ct_bridge_pre(void *priv, struct sk_buff *skb, { struct nf_hook_state bridge_state = *state; enum ip_conntrack_info ctinfo; + int ret, offset = 0; struct nf_conn *ct; - u32 len; - int ret; + __be16 outer_proto; + u32 len, data_len;
ct = nf_ct_get(skb, &ctinfo); if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED) return NF_ACCEPT;
+ switch (skb->protocol) { + case htons(ETH_P_PPP_SES): { + struct ppp_hdr { + struct pppoe_hdr hdr; + __be16 proto; + } *ph; + + offset = PPPOE_SES_HLEN; + if (!pskb_may_pull(skb, offset)) + return NF_ACCEPT; + outer_proto = skb->protocol; + ph = (struct ppp_hdr *)(skb->data); + switch (ph->proto) { + case htons(PPP_IP): + skb->protocol = htons(ETH_P_IP); + break; + case htons(PPP_IPV6): + skb->protocol = htons(ETH_P_IPV6); + break; + default: + nf_ct_set(skb, NULL, IP_CT_UNTRACKED); + return NF_ACCEPT; + } + data_len = ntohs(ph->hdr.length) - 2; + skb_pull_rcsum(skb, offset); + skb_reset_network_header(skb); + break; + } + case htons(ETH_P_8021Q): { + struct vlan_hdr *vhdr; + + offset = VLAN_HLEN; + if (!pskb_may_pull(skb, offset)) + return NF_ACCEPT; + outer_proto = skb->protocol; + vhdr = (struct vlan_hdr *)(skb->data); + skb->protocol = vhdr->h_vlan_encapsulated_proto; + data_len = U32_MAX; + skb_pull_rcsum(skb, offset); + skb_reset_network_header(skb); + break; + } + default: + data_len = U32_MAX; + break; + } + + ret = NF_ACCEPT; switch (skb->protocol) { case htons(ETH_P_IP): if (!pskb_may_pull(skb, sizeof(struct iphdr))) - return NF_ACCEPT; + goto do_not_track;
len = skb_ip_totlen(skb); + if (data_len < len) + len = data_len; if (pskb_trim_rcsum(skb, len)) - return NF_ACCEPT; + goto do_not_track;
if (nf_ct_br_ip_check(skb)) - return NF_ACCEPT; + goto do_not_track;
bridge_state.pf = NFPROTO_IPV4; ret = nf_ct_br_defrag4(skb, &bridge_state); break; case htons(ETH_P_IPV6): if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) - return NF_ACCEPT; + goto do_not_track;
len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len); + if (data_len < len) + len = data_len; if (pskb_trim_rcsum(skb, len)) - return NF_ACCEPT; + goto do_not_track;
if (nf_ct_br_ipv6_check(skb)) - return NF_ACCEPT; + goto do_not_track;
bridge_state.pf = NFPROTO_IPV6; ret = nf_ct_br_defrag6(skb, &bridge_state); break; default: nf_ct_set(skb, NULL, IP_CT_UNTRACKED); - return NF_ACCEPT; + goto do_not_track; }
- if (ret != NF_ACCEPT) - return ret; + if (ret == NF_ACCEPT) + ret = nf_conntrack_in(skb, &bridge_state);
- return nf_conntrack_in(skb, &bridge_state); +do_not_track: + if (offset) { + skb_push_rcsum(skb, offset); + skb_reset_network_header(skb); + skb->protocol = outer_proto; + } + return ret; }
static unsigned int nf_ct_bridge_in(void *priv, struct sk_buff *skb,