diff options
| author | Geliang Tang <[email protected]> | 2025-07-18 22:06:57 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2025-07-22 00:48:32 +0000 |
| commit | 51a62199a8aaac0d1645b1dd8e670a6f35aead81 (patch) | |
| tree | 80483748234733211561e11dbf47e384c2b28dee /net/ipv4/tcp.c | |
| parent | mptcp: sockopt: drop redundant tcp_getsockopt (diff) | |
| download | kernel-51a62199a8aaac0d1645b1dd8e670a6f35aead81.tar.gz kernel-51a62199a8aaac0d1645b1dd8e670a6f35aead81.zip | |
tcp: add tcp_sock_set_maxseg
Add a helper tcp_sock_set_maxseg() to directly set the TCP_MAXSEG
sockopt from kernel space.
This new helper will be used in the following patch from MPTCP.
Signed-off-by: Geliang Tang <[email protected]>
Acked-by: Matthieu Baerts (NGI0) <[email protected]>
Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 31149a0ac849..71a956fbfc55 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3751,6 +3751,19 @@ int tcp_set_window_clamp(struct sock *sk, int val) return 0; } +int tcp_sock_set_maxseg(struct sock *sk, int val) +{ + /* Values greater than interface MTU won't take effect. However + * at the point when this call is done we typically don't yet + * know which interface is going to be used + */ + if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) + return -EINVAL; + + tcp_sk(sk)->rx_opt.user_mss = val; + return 0; +} + /* * Socket option code for TCP. */ @@ -3883,15 +3896,7 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname, switch (optname) { case TCP_MAXSEG: - /* Values greater than interface MTU won't take effect. However - * at the point when this call is done we typically don't yet - * know which interface is going to be used - */ - if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) { - err = -EINVAL; - break; - } - tp->rx_opt.user_mss = val; + err = tcp_sock_set_maxseg(sk, val); break; case TCP_NODELAY: |