selftests/bpf: extend sockopt_sk selftest with TCP_CONGESTION use case (fd5ef31f) · Commits · 戴 / test

tools/testing/selftests/bpf/progs/sockopt_sk.c

+22 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		#include <string.h>
		#include <netinet/in.h>
		#include <netinet/tcp.h>
		#include <linux/bpf.h>
		#include "bpf_helpers.h"

		@@ -42,6 +44,14 @@ int _getsockopt(struct bpf_sockopt *ctx)
		return 1;
		}

		if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
		/* Not interested in SOL_TCP:TCP_CONGESTION;
		* let next BPF program in the cgroup chain or kernel
		* handle it.
		*/
		return 1;
		}

		if (ctx->level != SOL_CUSTOM)
		return 0; /* EPERM, deny everything except custom level */

		@@ -91,6 +101,18 @@ int _setsockopt(struct bpf_sockopt *ctx)
		return 1;
		}

		if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
		/* Always use cubic */

		if (optval + 5 > optval_end)
		return 0; /* EPERM, bounds check */

		memcpy(optval, "cubic", 5);
		ctx->optlen = 5;

		return 1;
		}

		if (ctx->level != SOL_CUSTOM)
		return 0; /* EPERM, deny everything except custom level */

+25 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <netinet/in.h>
		#include <netinet/tcp.h>

		#include <linux/filter.h>
		#include <bpf/bpf.h>
		@@ -25,6 +26,7 @@ static int getsetsockopt(void)
		union {
		char u8[4];
		__u32 u32;
		char cc[16]; /* TCP_CA_NAME_MAX */
		} buf = {};
		socklen_t optlen;

		@@ -115,6 +117,29 @@ static int getsetsockopt(void)
		goto err;
		}

		/* TCP_CONGESTION can extend the string */

		strcpy(buf.cc, "nv");
		err = setsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, strlen("nv"));
		if (err) {
		log_err("Failed to call setsockopt(TCP_CONGESTION)");
		goto err;
		}


		optlen = sizeof(buf.cc);
		err = getsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, &optlen);
		if (err) {
		log_err("Failed to call getsockopt(TCP_CONGESTION)");
		goto err;
		}

		if (strcmp(buf.cc, "cubic") != 0) {
		log_err("Unexpected getsockopt(TCP_CONGESTION) %s != %s",
		buf.cc, "cubic");
		goto err;
		}

		close(fd);
		return 0;
		err: