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Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org, Francesco Ruggeri Subject: [PATCH v4 14/21] net/tcp: Add TCP-AO SNE support Date: Wed, 15 Feb 2023 18:33:28 +0000 Message-Id: <20230215183335.800122-15-dima@arista.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230215183335.800122-1-dima@arista.com> References: <20230215183335.800122-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add Sequence Number Extension (SNE) extension for TCP-AO. This is needed to protect long-living TCP-AO connections from replaying attacks after sequence number roll-over, see RFC5925 (6.2). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- net/ipv4/tcp_input.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 264db761153b..9f23cab1e835 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3528,9 +3528,21 @@ static inline bool tcp_may_update_window(const struc= t tcp_sock *tp, static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) { u32 delta =3D ack - tp->snd_una; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; +#endif =20 sock_owned_by_me((struct sock *)tp); tp->bytes_acked +=3D delta; +#ifdef CONFIG_TCP_AO + ao =3D rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held((struct sock *)tp)); + if (ao) { + if (ack < ao->snd_sne_seq) + ao->snd_sne++; + ao->snd_sne_seq =3D ack; + } +#endif tp->snd_una =3D ack; } =20 @@ -3538,9 +3550,21 @@ static void tcp_snd_una_update(struct tcp_sock *tp, = u32 ack) static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) { u32 delta =3D seq - tp->rcv_nxt; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; +#endif =20 sock_owned_by_me((struct sock *)tp); tp->bytes_received +=3D delta; +#ifdef CONFIG_TCP_AO + ao =3D rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held((struct sock *)tp)); + if (ao) { + if (seq < ao->rcv_sne_seq) + ao->rcv_sne++; + ao->rcv_sne_seq =3D seq; + } +#endif WRITE_ONCE(tp->rcv_nxt, seq); } =20 @@ -6369,6 +6393,17 @@ static int tcp_rcv_synsent_state_process(struct sock= *sk, struct sk_buff *skb, * simultaneous connect with crossed SYNs. * Particularly, it can be connect to self. */ +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; + + ao =3D rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held(sk)); + if (ao) { + ao->risn =3D th->seq; + ao->rcv_sne =3D 0; + ao->rcv_sne_seq =3D ntohl(th->seq); + } +#endif tcp_set_state(sk, TCP_SYN_RECV); =20 if (tp->rx_opt.saw_tstamp) { --=20 2.39.1