netdev - [PATCH net-next 06/12] gtp: pass up link local traffic to userspace socket

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Message-Id: <20240425105138.1361098-7-pablo@netfilter.org>
Date: Thu, 25 Apr 2024 12:51:32 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	laforge@...ocom.org,
	pespin@...mocom.de,
	osmith@...mocom.de,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	fw@...len.de
Subject: [PATCH net-next 06/12] gtp: pass up link local traffic to userspace socket

According to TS 29.061, it is possible to see IPv6 link-local traffic in
the GTP tunnel, see 11.2.1.3.2 IPv6 Stateless Address Autoconfiguration
(IPv6 SLAAC).

Pass up these packets to the userspace daemon to handle them as control
GTP traffic.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 drivers/net/gtp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index ca3b1df19e6d..52f4aeecb8f8 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -251,6 +251,10 @@ static bool gtp_check_ms_ipv6(struct sk_buff *skb, struct pdp_ctx *pctx,
 
 	ip6h = (struct ipv6hdr *)(skb->data + hdrlen);
 
+	if ((ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL) ||
+	    (ipv6_addr_type(&ip6h->daddr) & IPV6_ADDR_LINKLOCAL))
+		return false;
+
 	if (role == GTP_ROLE_SGSN) {
 		ret = ipv6_pdp_addr_equal(&ip6h->daddr, &pctx->ms.addr6);
 	} else {
-- 
2.30.2