[PATCH net-next v2 2/3] ipv6: remove IP6SKB_FAKEJUMBO flag
From: Mariusz Klimek <hidden>
Date: 2026-01-06 09:53:39
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
This patch removes the IP6SKB_FAKEJUMBO flag that is used as a work-around to bypass MTU validation of BIG TCP jumbograms due to a bug in skb_gso_network_seglen. This work-around is no longer required now that the bug is fixed. Signed-off-by: Mariusz Klimek <redacted> --- include/linux/ipv6.h | 1 - net/ipv6/ip6_output.c | 4 +--- 2 files changed, 1 insertion(+), 4 deletions(-)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 7294e4e89b79..9f076171106e 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h@@ -155,7 +155,6 @@ struct inet6_skb_parm { #define IP6SKB_L3SLAVE 64 #define IP6SKB_JUMBOGRAM 128 #define IP6SKB_SEG6 256 -#define IP6SKB_FAKEJUMBO 512 #define IP6SKB_MULTIPATH 1024 #define IP6SKB_MCROUTE 2048 };
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index f904739e99b9..9af9ec6bdb8c 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c@@ -179,8 +179,7 @@ ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk, static int ip6_finish_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb, unsigned int mtu) { - if (!(IP6CB(skb)->flags & IP6SKB_FAKEJUMBO) && - !skb_gso_validate_network_len(skb, mtu)) + if (!skb_gso_validate_network_len(skb, mtu)) return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu); return ip6_finish_output2(net, sk, skb);
@@ -323,7 +322,6 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, proto = IPPROTO_HOPOPTS; seg_len = 0; - IP6CB(skb)->flags |= IP6SKB_FAKEJUMBO; } skb_push(skb, sizeof(struct ipv6hdr));
--
2.47.3