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Message-ID: <20240914085950.GC12935@kernel.org>
Date: Sat, 14 Sep 2024 09:59:50 +0100
From: Simon Horman <horms@...nel.org>
To: Tiago Lam <tiagolam@...udflare.com>
Cc: "David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
Jakub Sitnicki <jakub@...udflare.com>, kernel-team@...udflare.com
Subject: Re: [RFC PATCH 2/3] ipv6: Run a reverse sk_lookup on sendmsg.
On Fri, Sep 13, 2024 at 10:39:20AM +0100, Tiago Lam wrote:
> This follows the same rationale provided for the ipv4 counterpart, where
> it now runs a reverse socket lookup when source addresses and/or ports
> are changed, on sendmsg, to check whether egress traffic should be
> allowed to go through or not.
>
> As with ipv4, the ipv6 sendmsg path is also extended here to support the
> IPV6_ORIGDSTADDR ancilliary message to be able to specify a source
Hi Tiago Lam,
Some minor nits from my side.
ancilliary -> ancillary
Likewise in patch 3/3.
Flagged by checkpatch.pl --codespell
> address/port.
>
> Suggested-by: Jakub Sitnicki <jakub@...udflare.com>
> Signed-off-by: Tiago Lam <tiagolam@...udflare.com>
> ---
> net/ipv6/datagram.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> net/ipv6/udp.c | 8 ++++--
> 2 files changed, 82 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
> index fff78496803d..4214dda1c320 100644
> --- a/net/ipv6/datagram.c
> +++ b/net/ipv6/datagram.c
> @@ -756,6 +756,27 @@ void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
> }
> EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
>
> +static inline bool reverse_sk_lookup(struct flowi6 *fl6, struct sock *sk,
> + struct in6_addr *saddr, __be16 sport)
> +{
> + if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
> + (saddr && sport) &&
> + (ipv6_addr_cmp(&sk->sk_v6_rcv_saddr, saddr) || inet_sk(sk)->inet_sport != sport)) {
Please consider, where it can trivially be achieved, limiting Networking
code to 80 columns wide.
Checkpatch can be run with a flag to check for this.
> + struct sock *sk_egress;
> +
> + bpf_sk_lookup_run_v6(sock_net(sk), IPPROTO_UDP, &fl6->daddr, fl6->fl6_dport,
> + saddr, ntohs(sport), 0, &sk_egress);
> + if (!IS_ERR_OR_NULL(sk_egress) &&
> + atomic64_read(&sk_egress->sk_cookie) == atomic64_read(&sk->sk_cookie))
> + return true;
> +
> + net_info_ratelimited("No reverse socket lookup match for local addr %pI6:%d remote addr %pI6:%d\n",
> + &saddr, ntohs(sport), &fl6->daddr, ntohs(fl6->fl6_dport));
> + }
> +
> + return false;
> +}
> +
> int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
> struct msghdr *msg, struct flowi6 *fl6,
> struct ipcm6_cookie *ipc6)
...
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