diff mbox series

[v2,bpf-next,3/5] bpf: Refactor bpf_setsockopt(TCP_CONGESTION) handling into another function

Message ID 20220923224512.2353244-1-kafai@fb.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Remove recursion check for struct_ops prog | expand

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Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 23 this patch: 23
netdev/cc_maintainers warning 8 maintainers not CCed: sdf@google.com john.fastabend@gmail.com yhs@fb.com haoluo@google.com jolsa@kernel.org kpsingh@kernel.org song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 5 this patch: 5
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netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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netdev/checkpatch warning WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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Commit Message

Martin KaFai Lau Sept. 23, 2022, 10:45 p.m. UTC 
From: Martin KaFai Lau <martin.lau@kernel.org>

This patch moves the bpf_setsockopt(TCP_CONGESTION) logic into
another function.  The next patch will add extra logic to avoid
recursion and this will make the latter patch easier to follow.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
 net/core/filter.c | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)
diff mbox series

Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index f4cea3ff994a..96f2f7a65e65 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5102,6 +5102,33 @@  static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname,
 	return 0;
 }
 
+static int sol_tcp_sockopt_congestion(struct sock *sk, char *optval,
+				      int *optlen, bool getopt)
+{
+	if (*optlen < 2)
+		return -EINVAL;
+
+	if (getopt) {
+		if (!inet_csk(sk)->icsk_ca_ops)
+			return -EINVAL;
+		/* BPF expects NULL-terminated tcp-cc string */
+		optval[--(*optlen)] = '\0';
+		return do_tcp_getsockopt(sk, SOL_TCP, TCP_CONGESTION,
+					 KERNEL_SOCKPTR(optval),
+					 KERNEL_SOCKPTR(optlen));
+	}
+
+	/* "cdg" is the only cc that alloc a ptr
+	 * in inet_csk_ca area.  The bpf-tcp-cc may
+	 * overwrite this ptr after switching to cdg.
+	 */
+	if (*optlen >= sizeof("cdg") - 1 && !strncmp("cdg", optval, *optlen))
+		return -ENOTSUPP;
+
+	return do_tcp_setsockopt(sk, SOL_TCP, TCP_CONGESTION,
+				KERNEL_SOCKPTR(optval), *optlen);
+}
+
 static int sol_tcp_sockopt(struct sock *sk, int optname,
 			   char *optval, int *optlen,
 			   bool getopt)
@@ -5125,16 +5152,7 @@  static int sol_tcp_sockopt(struct sock *sk, int optname,
 			return -EINVAL;
 		break;
 	case TCP_CONGESTION:
-		if (*optlen < 2)
-			return -EINVAL;
-		/* "cdg" is the only cc that alloc a ptr
-		 * in inet_csk_ca area.  The bpf-tcp-cc may
-		 * overwrite this ptr after switching to cdg.
-		 */
-		if (!getopt && *optlen >= sizeof("cdg") - 1 &&
-		    !strncmp("cdg", optval, *optlen))
-			return -ENOTSUPP;
-		break;
+		return sol_tcp_sockopt_congestion(sk, optval, optlen, getopt);
 	case TCP_SAVED_SYN:
 		if (*optlen < 1)
 			return -EINVAL;
@@ -5159,13 +5177,6 @@  static int sol_tcp_sockopt(struct sock *sk, int optname,
 			return 0;
 		}
 
-		if (optname == TCP_CONGESTION) {
-			if (!inet_csk(sk)->icsk_ca_ops)
-				return -EINVAL;
-			/* BPF expects NULL-terminated tcp-cc string */
-			optval[--(*optlen)] = '\0';
-		}
-
 		return do_tcp_getsockopt(sk, SOL_TCP, optname,
 					 KERNEL_SOCKPTR(optval),
 					 KERNEL_SOCKPTR(optlen));