diff options
| author |   Stanislav Fomichev <sdf@google.com> | 2019-07-29 14:51:11 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2019-08-01 13:55:52 -0700 |
| commit | fd5ef31f370a8b7000794cd8a428b349dbfbbb80 (patch) | |
| tree | ea5d70a8c8822f44c1d2bea45adc64769a6167d7 /tools/testing/selftests/bpf/progs/sockopt_sk.c | |
| parent | bpf: always allocate at least 16 bytes for setsockopt hook (diff) | |
| download | linux-dev-fd5ef31f370a8b7000794cd8a428b349dbfbbb80.tar.xz linux-dev-fd5ef31f370a8b7000794cd8a428b349dbfbbb80.zip | |
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>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/sockopt_sk.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/sockopt_sk.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/sockopt_sk.c b/tools/testing/selftests/bpf/progs/sockopt_sk.c index 076122c898e9..9a3d1c79e6fe 100644 --- a/tools/testing/selftests/bpf/progs/sockopt_sk.c +++ b/tools/testing/selftests/bpf/progs/sockopt_sk.c @@ -1,5 +1,7 @@ // 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 */ |