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Message-ID: <CANn89i+OL_kPwmHEW-KBGdd-prAGC3NaQG4MNq4ZEvWpw7Q-7A@mail.gmail.com>
Date: Mon, 9 Oct 2023 09:18:58 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: George Guo <guodongtai@...inos.cn>
Cc: fw@...len.de, davem@...emloft.net, dongtai.guo@...ux.dev,
dsahern@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com
Subject: Re: [PATCH v2] tcp: cleanup secure_{tcp, tcpv6}_ts_off
On Mon, Oct 9, 2023 at 5:12 AM George Guo <guodongtai@...inos.cn> wrote:
>
> Correct secure_tcp_ts_off and secure_tcpv6_ts_off call parameter order
>
I do not think this patch is correct.
We have to exchange saddr/daddr from an incoming packet in order to compute
a hash if the function expects saddr to be the local host address, and
daddr being the remote peer address.
For instance, tcp_v4_connect() uses :
WRITE_ONCE(tp->tsoffset,
secure_tcp_ts_off(net, inet->inet_saddr,
inet->inet_daddr));
While when receiving a packet from the other peer, it correctly swaps
saddr/daddr
tcp_v4_init_ts_off(const struct net *net, const struct sk_buff *skb)
{
return secure_tcp_ts_off(net, ip_hdr(skb)->daddr, ip_hdr(skb)->saddr);
}
> Signed-off-by: George Guo <guodongtai@...inos.cn>
> ---
> net/ipv4/syncookies.c | 4 ++--
> net/ipv4/tcp_ipv4.c | 2 +-
> net/ipv6/syncookies.c | 4 ++--
> net/ipv6/tcp_ipv6.c | 4 ++--
> 4 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
> index dc478a0574cb..537f368a0b66 100644
> --- a/net/ipv4/syncookies.c
> +++ b/net/ipv4/syncookies.c
> @@ -360,8 +360,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
>
> if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
> tsoff = secure_tcp_ts_off(sock_net(sk),
> - ip_hdr(skb)->daddr,
> - ip_hdr(skb)->saddr);
> + ip_hdr(skb)->saddr,
> + ip_hdr(skb)->daddr);
> tcp_opt.rcv_tsecr -= tsoff;
> }
>
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index a441740616d7..54717d261693 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -104,7 +104,7 @@ static u32 tcp_v4_init_seq(const struct sk_buff *skb)
>
> static u32 tcp_v4_init_ts_off(const struct net *net, const struct sk_buff *skb)
> {
> - return secure_tcp_ts_off(net, ip_hdr(skb)->daddr, ip_hdr(skb)->saddr);
> + return secure_tcp_ts_off(net, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
> }
>
> int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
> diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
> index 5014aa663452..9af484a4d518 100644
> --- a/net/ipv6/syncookies.c
> +++ b/net/ipv6/syncookies.c
> @@ -162,8 +162,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
>
> if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
> tsoff = secure_tcpv6_ts_off(sock_net(sk),
> - ipv6_hdr(skb)->daddr.s6_addr32,
> - ipv6_hdr(skb)->saddr.s6_addr32);
> + ipv6_hdr(skb)->saddr.s6_addr32,
> + ipv6_hdr(skb)->daddr.s6_addr32);
> tcp_opt.rcv_tsecr -= tsoff;
> }
>
> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index bfe7d19ff4fd..7e2f924725c6 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -119,8 +119,8 @@ static u32 tcp_v6_init_seq(const struct sk_buff *skb)
>
> static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb)
> {
> - return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32,
> - ipv6_hdr(skb)->saddr.s6_addr32);
> + return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->saddr.s6_addr32,
> + ipv6_hdr(skb)->daddr.s6_addr32);
> }
>
> static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
> --
> 2.34.1
>
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