netdev - [PATCH net-next 1/7] ipv6: add daddr/final storage in struct ipv6

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Message-ID: <20260206173426.1638518-2-edumazet@google.com>
Date: Fri,  6 Feb 2026 17:34:20 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
	Kuniyuki Iwashima <kuniyu@...gle.com>, David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/7] ipv6: add daddr/final storage in struct ipv6_pinfo

After commit b409a7f7176b ("ipv6: colocate inet6_cork in
inet_cork_full") we have room in ipv6_pinfo to hold daddr/final
in case they need to be populated in fl6_update_dst() calls.

This will allow stack canary removal in IPv6 tx fast paths.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/ipv6.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 20aae8357dd151e8c7d6972f41e77cebf1379177..75b98d4849d66b167376769a25bb752d8979c8b5 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -209,6 +209,10 @@ struct ipv6_fl_socklist;
 struct ipv6_pinfo {
 	/* Used in tx path (inet6_csk_route_socket(), ip6_xmit()) */
 	struct in6_addr 	saddr;
+	union {
+		struct in6_addr daddr;
+		struct in6_addr final;
+	};
 	__be32			flow_label;
 	u32			dst_cookie;
 	struct ipv6_txoptions __rcu	*opt;
-- 
2.53.0.rc2.204.g2597b5adb4-goog