linux-kernel - [PATCH bpf-next] bpf: Fix build error without CONFIG

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Date:   Wed, 12 Jun 2019 17:18:47 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <kafai@...com>,
        <songliubraving@...com>, <yhs@...com>, <davem@...emloft.net>,
        <jakub.kicinski@...ronome.com>, <jonathan.lemon@...il.com>
CC:     <linux-kernel@...r.kernel.org>, <xdp-newbies@...r.kernel.org>,
        <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH bpf-next] bpf: Fix build error without CONFIG_INET

If CONFIG_INET is not set, building fails:

kernel/bpf/verifier.o: In function `check_mem_access':
verifier.c: undefined reference to `bpf_xdp_sock_is_valid_access'
kernel/bpf/verifier.o: In function `convert_ctx_accesses':
verifier.c: undefined reference to `bpf_xdp_sock_convert_ctx_access'

Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: fada7fdc83c0 ("bpf: Allow bpf_map_lookup_elem() on an xskmap")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 include/linux/bpf.h | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 4118f3d..72ca1e7 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -725,13 +725,6 @@ void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
 void __cpu_map_flush(struct bpf_map *map);
 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
 		    struct net_device *dev_rx);
-bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
-				  struct bpf_insn_access_aux *info);
-u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
-				    const struct bpf_insn *si,
-				    struct bpf_insn *insn_buf,
-				    struct bpf_prog *prog,
-				    u32 *target_size);
 
 /* Return map's numa specified by userspace */
 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
@@ -1107,6 +1100,15 @@ u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
 				    struct bpf_insn *insn_buf,
 				    struct bpf_prog *prog,
 				    u32 *target_size);
+
+bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
+				  struct bpf_insn_access_aux *info);
+
+u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
+				    const struct bpf_insn *si,
+				    struct bpf_insn *insn_buf,
+				    struct bpf_prog *prog,
+				    u32 *target_size);
 #else
 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
 						enum bpf_access_type type,
@@ -1123,6 +1125,21 @@ static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
 {
 	return 0;
 }
+static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
+						enum bpf_access_type type,
+						struct bpf_insn_access_aux *info)
+{
+	return false;
+}
+
+static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
+						  const struct bpf_insn *si,
+						  struct bpf_insn *insn_buf,
+						  struct bpf_prog *prog,
+						  u32 *target_size)
+{
+	return 0;
+}
 #endif /* CONFIG_INET */
 
 #endif /* _LINUX_BPF_H */
-- 
2.7.4