diff mbox series

[bpf-next,1/2] bpf: Add support for {set|get} socket options from setsockopt BPF

Message ID 20210817224221.3257826-2-prankgup@fb.com (mailing list archive)
State Accepted
Commit 2c531639deb5e3ddfd6e8123b82052b2d9fbc6e5
Delegated to: BPF
Headers show
Series Add support for bpf_setsockopt and | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for bpf-next
netdev/subject_prefix success Link
netdev/cc_maintainers warning 5 maintainers not CCed: kafai@fb.com netdev@vger.kernel.org john.fastabend@gmail.com kpsingh@kernel.org yhs@fb.com
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 4 this patch: 4
netdev/kdoc success Errors and warnings before: 3 this patch: 3
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 14 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 4 this patch: 4
netdev/header_inline success Link

Commit Message

Prankur gupta Aug. 17, 2021, 10:42 p.m. UTC 
Add logic to call bpf_setsockopt and bpf_getsockopt from
setsockopt BPF programs.
Example use case, when the user sets the IPV6_TCLASS socket option
we would also like to change the tcp-cc for that socket.
We don't have any use case for calling bpf_setsockopt from
supposedly read-only sys_getsockopti, so it is made available to
BPF_CGROUP_SETSOCKOPT only.

Signed-off-by: Prankur gupta <prankgup@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
---
 kernel/bpf/cgroup.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 9f35928bab0a..8e9d99e2ade4 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1873,6 +1873,14 @@  cg_sockopt_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_sk_storage_get_proto;
 	case BPF_FUNC_sk_storage_delete:
 		return &bpf_sk_storage_delete_proto;
+	case BPF_FUNC_setsockopt:
+		if (prog->expected_attach_type == BPF_CGROUP_SETSOCKOPT)
+			return &bpf_sk_setsockopt_proto;
+		return NULL;
+	case BPF_FUNC_getsockopt:
+		if (prog->expected_attach_type == BPF_CGROUP_SETSOCKOPT)
+			return &bpf_sk_getsockopt_proto;
+		return NULL;
 #endif
 #ifdef CONFIG_INET
 	case BPF_FUNC_tcp_sock: