From: Pedro Falcato <pfalcato@suse.de>
To: Matthieu Baerts <matttbe@kernel.org>,
	Mat Martineau <martineau@kernel.org>,
	Geliang Tang <geliang@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>,
	netdev@vger.kernel.org, mptcp@lists.linux.dev,
	linux-kernel@vger.kernel.org, Pedro Falcato <pfalcato@suse.de>
Subject: [PATCH] mptcp: Align mptcp_inet6_sk with other protocols
Date: Wed, 30 Apr 2025 16:45:41 +0100	[thread overview]
Message-ID: <20250430154541.1038561-1-pfalcato@suse.de> (raw)

Ever since commit f5f80e32de12 ("ipv6: remove hard coded limitation on
ipv6_pinfo") that protocols stopped using the old "obj_size -
sizeof(struct ipv6_pinfo)" way of grabbing ipv6_pinfo, that severely
restricted struct layout and caused fun, hard to see issues.

However, mptcp_inet6_sk wasn't fixed (unlike tcp_inet6_sk). Do so.
The non-cloned sockets already do the right thing using
ipv6_pinfo_offset + the generic IPv6 code.

Signed-off-by: Pedro Falcato <pfalcato@suse.de>
---
 net/mptcp/protocol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 26ffa06c21e8..c4fd558307f2 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3142,9 +3142,9 @@ static int mptcp_disconnect(struct sock *sk, int flags)
 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
 static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk)
 {
-	unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo);
+	struct mptcp6_sock *msk6 = container_of(mptcp_sk(sk), struct mptcp6_sock, msk);
 
-	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
+	return &msk6->np;
 }
 
 static void mptcp_copy_ip6_options(struct sock *newsk, const struct sock *sk)
-- 
2.49.0

next             reply	other threads:[~2025-04-30 15:45 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-30 15:45 Pedro Falcato [this message]
2025-04-30 17:08 ` [PATCH] mptcp: Align mptcp_inet6_sk with other protocols MPTCP CI
2025-05-02 17:00 ` Matthieu Baerts
2025-05-03  1:40 ` patchwork-bot+netdevbpf

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20250430154541.1038561-1-pfalcato@suse.de \
    --to=pfalcato@suse.de \
    --cc=davem@davemloft.net \
    --cc=edumazet@google.com \
    --cc=geliang@kernel.org \
    --cc=horms@kernel.org \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=martineau@kernel.org \
    --cc=matttbe@kernel.org \
    --cc=mptcp@lists.linux.dev \
    --cc=netdev@vger.kernel.org \
    --cc=pabeni@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.