[PATCH net-next v4 3/7] ipv6: Add case for IPV6_TLV_TNL_ENCAP_LIMIT in EH TLV switch
From: Tom Herbert <hidden>
Date: 2026-01-21 21:49:55
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
IPV6_TLV_TNL_ENCAP_LIMIT is a recognized Destination option that is processed in ip_tunnel.c. Add a case for it in the switch in ip6_parse_tlv so that it is recognized as a known option. Also remove the unlikely around the check for max_count < 0 since the default limits for HBH and Destination options can be less than zero. Signed-off-by: Tom Herbert <redacted> --- net/ipv6/exthdrs.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 45bbad76f5de..394e3397e4d4 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c@@ -122,7 +122,7 @@ static bool ip6_parse_tlv(bool hopbyhop, int tlv_count = 0; int padlen = 0; - if (unlikely(max_count < 0)) { + if (max_count < 0) { disallow_unknowns = true; max_count = -max_count; }
@@ -202,6 +202,16 @@ static bool ip6_parse_tlv(bool hopbyhop, if (!ipv6_dest_hao(skb, off)) return false; break; +#endif +#if IS_ENABLED(CONFIG_IPV6_TUNNEL) + case IPV6_TLV_TNL_ENCAP_LIMIT: + /* The tunnel encapsulation option. + * This is handled in ip6_tunnel.c so + * we don't need to do anything here + * except to accept it as a recognized + * option + */ + break; #endif default: if (!ip6_tlvopt_unknown(skb, off,
--
2.43.0