diff mbox series

[bpf-next,v3,1/2] net: bpf: Always call BPF cgroup filters for egress.

Message ID 20230620213227.180421-2-kuifeng@meta.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Fix missing synack in BPF cgroup_skb filters | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1070 this patch: 1070
netdev/cc_maintainers fail 12 maintainers not CCed: daniel@iogearbox.net yhs@fb.com kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com song@kernel.org sdf@google.com andrii@kernel.org bpf@vger.kernel.org jolsa@kernel.org haoluo@google.com ast@kernel.org
netdev/build_clang success Errors and warnings before: 142 this patch: 142
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1077 this patch: 1077
netdev/checkpatch warning WARNING: From:/Signed-off-by: email address mismatch: 'From: Kui-Feng Lee <thinker.li@gmail.com>' != 'Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>'
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR success PR summary
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bpf/vmtest-bpf-next-VM_Test-6 success Logs for set-matrix
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bpf/vmtest-bpf-next-VM_Test-17 success Logs for test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-16 success Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-26 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-12 success Logs for test_progs on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-8 fail Logs for test_maps on s390x with gcc

Commit Message

Kui-Feng Lee June 20, 2023, 9:32 p.m. UTC 
Always call BPF filters if CGROUP BPF is enabled for EGRESS without
checking skb->sk against sk.

The filters were called only if skb is owned by the sock that the
skb is sent out through.  In another words, skb->sk should point to
the sock that it is sending through its egress.  However, the filters would
miss SYNACK skbs that they are owned by a request_sock but sent through
the listening sock, that is the socket listening incoming connections.
This is an unnecessary restrict.

Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
---
 include/linux/bpf-cgroup.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index 57e9e109257e..e656da531f9f 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -199,7 +199,7 @@  static inline bool cgroup_bpf_sock_enabled(struct sock *sk,
 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)			       \
 ({									       \
 	int __ret = 0;							       \
-	if (cgroup_bpf_enabled(CGROUP_INET_EGRESS) && sk && sk == skb->sk) { \
+	if (cgroup_bpf_enabled(CGROUP_INET_EGRESS) && sk) {		       \
 		typeof(sk) __sk = sk_to_full_sk(sk);			       \
 		if (sk_fullsock(__sk) &&				       \
 		    cgroup_bpf_sock_enabled(__sk, CGROUP_INET_EGRESS))	       \