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authorMartin KaFai Lau <kafai@fb.com>2021-07-01 23:06:19 +0300
committerAndrii Nakryiko <andrii@kernel.org>2021-07-24 02:45:07 +0300
commit3cee6fb8e69ecd79be891c89a94974c48a25a437 (patch)
tree4f8b1e34f10c77c3589d1b4dc042ff7293616526 /net/ipv4/tcp_ipv4.c
parent04c7820b776f1c4b48698574c47de9e940d368e8 (diff)
downloadlinux-3cee6fb8e69ecd79be891c89a94974c48a25a437.tar.xz
bpf: tcp: Support bpf_(get|set)sockopt in bpf tcp iter
This patch allows bpf tcp iter to call bpf_(get|set)sockopt. To allow a specific bpf iter (tcp here) to call a set of helpers, get_func_proto function pointer is added to bpf_iter_reg. The bpf iter is a tracing prog which currently requires CAP_PERFMON or CAP_SYS_ADMIN, so this patch does not impose other capability checks for bpf_(get|set)sockopt. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Acked-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210701200619.1036715-1-kafai@fb.com
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 84ac0135d389..f9c6e47141fd 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -3259,6 +3259,20 @@ static const struct bpf_iter_seq_info tcp_seq_info = {
.seq_priv_size = sizeof(struct bpf_tcp_iter_state),
};
+static const struct bpf_func_proto *
+bpf_iter_tcp_get_func_proto(enum bpf_func_id func_id,
+ const struct bpf_prog *prog)
+{
+ switch (func_id) {
+ case BPF_FUNC_setsockopt:
+ return &bpf_sk_setsockopt_proto;
+ case BPF_FUNC_getsockopt:
+ return &bpf_sk_getsockopt_proto;
+ default:
+ return NULL;
+ }
+}
+
static struct bpf_iter_reg tcp_reg_info = {
.target = "tcp",
.ctx_arg_info_size = 1,
@@ -3266,6 +3280,7 @@ static struct bpf_iter_reg tcp_reg_info = {
{ offsetof(struct bpf_iter__tcp, sk_common),
PTR_TO_BTF_ID_OR_NULL },
},
+ .get_func_proto = bpf_iter_tcp_get_func_proto,
.seq_info = &tcp_seq_info,
};