From 7776f5d23fb289706d85491549dda6aa6f162a27 Mon Sep 17 00:00:00 2001 From: Jakub Sitnicki Date: Thu, 14 Oct 2021 17:44:10 +0800 Subject: [PATCH] bpf, sockmap, udp: sk_prot needs inuse_idx set for proc stats stable inclusion from stable-5.10.54 commit 3b5b0afd8d97b0e98e5dc91526414e9d27c08027 bugzilla: 175586 https://gitee.com/openeuler/kernel/issues/I4DVDU Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3b5b0afd8d97b0e98e5dc91526414e9d27c08027 -------------------------------- [ Upstream commit 54ea2f49fd9400dd698c25450be3352b5613b3b4 ] The proc socket stats use sk_prot->inuse_idx value to record inuse sock stats. We currently do not set this correctly from sockmap side. The result is reading sock stats '/proc/net/sockstat' gives incorrect values. The socket counter is incremented correctly, but because we don't set the counter correctly when we replace sk_prot we may omit the decrement. To get the correct inuse_idx value move the core_initcall that initializes the UDP proto handlers to late_initcall. This way it is initialized after UDP has the chance to assign the inuse_idx value from the register protocol handler. Fixes: edc6741cc660 ("bpf: Add sockmap hooks for UDP sockets") Signed-off-by: Jakub Sitnicki Signed-off-by: Daniel Borkmann Reviewed-by: Cong Wang Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20210714154750.528206-1-jakub@cloudflare.com Signed-off-by: Sasha Levin Signed-off-by: Chen Jun Acked-by: Weilong Chen Signed-off-by: Chen Jun Signed-off-by: Zheng Zengkai --- net/ipv4/udp_bpf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c index 7a94791efc1a..69c9663f9ee7 100644 --- a/net/ipv4/udp_bpf.c +++ b/net/ipv4/udp_bpf.c @@ -39,7 +39,7 @@ static int __init udp_bpf_v4_build_proto(void) udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV4], &udp_prot); return 0; } -core_initcall(udp_bpf_v4_build_proto); +late_initcall(udp_bpf_v4_build_proto); struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock) { -- GitLab