Thread (22 messages) 22 messages, 2 authors, 2025-03-14
STALE442d REVIEWED: 2 (2M)
Revisions (9)
  1. v1 [diff vs current]
  2. v2 [diff vs current]
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  8. v8 [diff vs current]
  9. v9 current

[PATCH v9 nf 05/15] netfilter: nft_chain_filter: Add bridge double vlan and pppoe

From: Eric Woudstra <hidden>
Date: 2025-03-05 10:30:11
Also in: bridge, linux-arm-kernel, linux-hardening, linux-mediatek, lkml, netfilter-devel
Subsystem: netfilter, networking [general], the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds

This adds the capability to evaluate 802.1ad, QinQ, PPPoE and PPPoE-in-Q
packets in the bridge filter chain.

Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Eric Woudstra <redacted>
---
 net/netfilter/nft_chain_filter.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index 19a553550c76..7c7080c1a67d 100644
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -232,11 +232,27 @@ nft_do_chain_bridge(void *priv,
 		    struct sk_buff *skb,
 		    const struct nf_hook_state *state)
 {
+	struct ethhdr *ethh = eth_hdr(skb);
 	struct nft_pktinfo pkt;
+	int thoff;
 
 	nft_set_pktinfo(&pkt, skb, state);
 
-	switch (eth_hdr(skb)->h_proto) {
+	switch (ethh->h_proto) {
+	case htons(ETH_P_PPP_SES):
+		thoff = PPPOE_SES_HLEN;
+		ethh += thoff;
+		break;
+	case htons(ETH_P_8021Q):
+		thoff = VLAN_HLEN;
+		ethh += thoff;
+		break;
+	default:
+		thoff = 0;
+		break;
+	}
+
+	switch (ethh->h_proto) {
 	case htons(ETH_P_IP):
 		nft_set_pktinfo_ipv4_validate(&pkt);
 		break;
@@ -248,6 +264,8 @@ nft_do_chain_bridge(void *priv,
 		break;
 	}
 
+	pkt.thoff += thoff;
+
 	return nft_do_chain(&pkt, priv);
 }
 
-- 
2.47.1
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