From 020e71a3cf7f50c0f2c54cf2444067b76fe6d785 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 25 Oct 2021 09:48:24 -0700 Subject: ipv4: guard IP_MINTTL with a static key RFC 5082 IP_MINTTL option is rarely used on hosts. Add a static key to remove from TCP fast path useless code, and potential cache line miss to fetch inet_sk(sk)->min_ttl Note that once ip4_min_ttl static key has been enabled, it stays enabled until next boot. Signed-off-by: Eric Dumazet Acked-by: Soheil Hassas Yeganeh Signed-off-by: Jakub Kicinski --- include/net/ip.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include') diff --git a/include/net/ip.h b/include/net/ip.h index cf229a531194..b71e88507c4a 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -750,6 +751,7 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, struct sk_buff *skb, int tlen, int offset); int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6); +DECLARE_STATIC_KEY_FALSE(ip4_min_ttl); int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, -- cgit v1.2.3