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From:   Tejun Heo <tj@kernel.org>
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Cc:     linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
        kernel-team@meta.com, Tejun Heo <tj@kernel.org>
Subject: [PATCH 03/31] BPF: Add @prog to bpf_struct_ops->check_member()
Date:   Tue, 29 Nov 2022 22:22:45 -1000
Message-Id: <20221130082313.3241517-4-tj@kernel.org>
In-Reply-To: <20221130082313.3241517-1-tj@kernel.org>
References: <20221130082313.3241517-1-tj@kernel.org>
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Pass an extra @prog parameter to bpf_struct_ops->check_member(). This will
be used in the future to verify @prog->aux->sleepable per-operation so that
a subset of operations in a struct_ops can be sleepable.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: David Vernet <dvernet@meta.com>
Acked-by: Josh Don <joshdon@google.com>
Acked-by: Hao Luo <haoluo@google.com>
Acked-by: Barret Rhoden <brho@google.com>
---
 include/linux/bpf.h   | 3 ++-
 kernel/bpf/verifier.c | 2 +-
 net/ipv4/bpf_tcp_ca.c | 3 ++-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 798aec816970..82f5c30100fd 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1337,7 +1337,8 @@ struct bpf_struct_ops {
 	const struct bpf_verifier_ops *verifier_ops;
 	int (*init)(struct btf *btf);
 	int (*check_member)(const struct btf_type *t,
-			    const struct btf_member *member);
+			    const struct btf_member *member,
+			    struct bpf_prog *prog);
 	int (*init_member)(const struct btf_type *t,
 			   const struct btf_member *member,
 			   void *kdata, const void *udata);
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 07c0259dfc1a..b5dba33f8e7d 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -14928,7 +14928,7 @@ static int check_struct_ops_btf_id(struct bpf_verifier_env *env)
 	}
 
 	if (st_ops->check_member) {
-		int err = st_ops->check_member(t, member);
+		int err = st_ops->check_member(t, member, prog);
 
 		if (err) {
 			verbose(env, "attach to unsupported member %s of struct %s\n",
diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index 6da16ae6a962..24c819509b98 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -247,7 +247,8 @@ static int bpf_tcp_ca_init_member(const struct btf_type *t,
 }
 
 static int bpf_tcp_ca_check_member(const struct btf_type *t,
-				   const struct btf_member *member)
+				   const struct btf_member *member,
+				   struct bpf_prog *prog)
 {
 	if (is_unsupported(__btf_member_bit_offset(t, member) / 8))
 		return -ENOTSUPP;
-- 
2.38.1