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selftests/bpf: extend sockopt_sk selftest with TCP_CONGESTION use case
Ignore SOL_TCP:TCP_CONGESTION in getsockopt and always override SOL_TCP:TCP_CONGESTION with "cubic" in setsockopt hook. Call setsockopt(SOL_TCP, TCP_CONGESTION) with short optval ("nv") to make sure BPF program has enough buffer space to replace it with "cubic". Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -1,5 +1,7 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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@ -42,6 +44,14 @@ int _getsockopt(struct bpf_sockopt *ctx)
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return 1;
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}
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if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
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/* Not interested in SOL_TCP:TCP_CONGESTION;
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* let next BPF program in the cgroup chain or kernel
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* handle it.
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*/
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return 1;
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}
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if (ctx->level != SOL_CUSTOM)
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return 0; /* EPERM, deny everything except custom level */
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@ -91,6 +101,18 @@ int _setsockopt(struct bpf_sockopt *ctx)
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return 1;
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}
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if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
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/* Always use cubic */
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if (optval + 5 > optval_end)
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return 0; /* EPERM, bounds check */
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memcpy(optval, "cubic", 5);
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ctx->optlen = 5;
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return 1;
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}
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if (ctx->level != SOL_CUSTOM)
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return 0; /* EPERM, deny everything except custom level */
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@ -6,6 +6,7 @@
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <linux/filter.h>
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#include <bpf/bpf.h>
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@ -25,6 +26,7 @@ static int getsetsockopt(void)
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union {
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char u8[4];
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__u32 u32;
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char cc[16]; /* TCP_CA_NAME_MAX */
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} buf = {};
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socklen_t optlen;
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@ -115,6 +117,29 @@ static int getsetsockopt(void)
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goto err;
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}
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/* TCP_CONGESTION can extend the string */
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strcpy(buf.cc, "nv");
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err = setsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, strlen("nv"));
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if (err) {
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log_err("Failed to call setsockopt(TCP_CONGESTION)");
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goto err;
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}
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optlen = sizeof(buf.cc);
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err = getsockopt(fd, SOL_TCP, TCP_CONGESTION, &buf, &optlen);
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if (err) {
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log_err("Failed to call getsockopt(TCP_CONGESTION)");
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goto err;
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}
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if (strcmp(buf.cc, "cubic") != 0) {
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log_err("Unexpected getsockopt(TCP_CONGESTION) %s != %s",
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buf.cc, "cubic");
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goto err;
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}
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close(fd);
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return 0;
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err:
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