diff options
| author |   Maxim Mikityanskiy <maximmi@nvidia.com> | 2022-06-15 16:48:44 +0300 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2022-06-16 21:20:30 -0700 |
| commit | 33bf9885040c399cf6a95bd33216644126728e14 (patch) | |
| tree | 882637b6f7deb157f08d0e3b52e780aae6b793bc /include/net/tcp.h | |
| parent | bpf: Allow helpers to accept pointers with a fixed size (diff) | |
| download | linux-dev-33bf9885040c399cf6a95bd33216644126728e14.tar.xz linux-dev-33bf9885040c399cf6a95bd33216644126728e14.zip | |
bpf: Add helpers to issue and check SYN cookies in XDP
The new helpers bpf_tcp_raw_{gen,check}_syncookie_ipv{4,6} allow an XDP
program to generate SYN cookies in response to TCP SYN packets and to
check those cookies upon receiving the first ACK packet (the final
packet of the TCP handshake).
Unlike bpf_tcp_{gen,check}_syncookie these new helpers don't need a
listening socket on the local machine, which allows to use them together
with synproxy to accelerate SYN cookie generation.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20220615134847.3753567-4-maximmi@nvidia.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 1e99f5c61f84..9a1efe23fab7 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -432,6 +432,7 @@ u16 tcp_v4_get_syncookie(struct sock *sk, struct iphdr *iph, struct tcphdr *th, u32 *cookie); u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, struct tcphdr *th, u32 *cookie); +u16 tcp_parse_mss_option(const struct tcphdr *th, u16 user_mss); u16 tcp_get_syncookie_mss(struct request_sock_ops *rsk_ops, const struct tcp_request_sock_ops *af_ops, struct sock *sk, struct tcphdr *th); |