From df3f94a0bbeb6cb6a02eb16b8e76f16b33cb2f8f Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 8 Oct 2018 11:30:01 -0700 Subject: bpf: fix building without CONFIG_INET The newly added TCP and UDP handling fails to link when CONFIG_INET is disabled: net/core/filter.o: In function `sk_lookup': filter.c:(.text+0x7ff8): undefined reference to `tcp_hashinfo' filter.c:(.text+0x7ffc): undefined reference to `tcp_hashinfo' filter.c:(.text+0x8020): undefined reference to `__inet_lookup_established' filter.c:(.text+0x8058): undefined reference to `__inet_lookup_listener' filter.c:(.text+0x8068): undefined reference to `udp_table' filter.c:(.text+0x8070): undefined reference to `udp_table' filter.c:(.text+0x808c): undefined reference to `__udp4_lib_lookup' net/core/filter.o: In function `bpf_sk_release': filter.c:(.text+0x82e8): undefined reference to `sock_gen_put' Wrap the related sections of code in #ifdefs for the config option. Furthermore, sk_lookup() should always have been marked 'static', this also avoids a warning about a missing prototype when building with 'make W=1'. Fixes: 6acc9b432e67 ("bpf: Add helper to retrieve socket in BPF") Signed-off-by: Arnd Bergmann Signed-off-by: Joe Stringer Acked-by: Song Liu Signed-off-by: Daniel Borkmann --- net/core/filter.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/core/filter.c b/net/core/filter.c index 30c6b2d3ef16..4bbc6567fcb8 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4817,8 +4817,9 @@ static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { }; #endif /* CONFIG_IPV6_SEG6_BPF */ -struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, - struct sk_buff *skb, u8 family, u8 proto) +#ifdef CONFIG_INET +static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, + struct sk_buff *skb, u8 family, u8 proto) { int dif = skb->dev->ifindex; bool refcounted = false; @@ -4951,6 +4952,7 @@ static const struct bpf_func_proto bpf_sk_release_proto = { .ret_type = RET_INTEGER, .arg1_type = ARG_PTR_TO_SOCKET, }; +#endif /* CONFIG_INET */ bool bpf_helper_changes_pkt_data(void *func) { @@ -5158,12 +5160,14 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) case BPF_FUNC_skb_ancestor_cgroup_id: return &bpf_skb_ancestor_cgroup_id_proto; #endif +#ifdef CONFIG_INET case BPF_FUNC_sk_lookup_tcp: return &bpf_sk_lookup_tcp_proto; case BPF_FUNC_sk_lookup_udp: return &bpf_sk_lookup_udp_proto; case BPF_FUNC_sk_release: return &bpf_sk_release_proto; +#endif default: return bpf_base_func_proto(func_id); } @@ -5264,12 +5268,14 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_redirect_hash_proto; case BPF_FUNC_get_local_storage: return &bpf_get_local_storage_proto; +#ifdef CONFIG_INET case BPF_FUNC_sk_lookup_tcp: return &bpf_sk_lookup_tcp_proto; case BPF_FUNC_sk_lookup_udp: return &bpf_sk_lookup_udp_proto; case BPF_FUNC_sk_release: return &bpf_sk_release_proto; +#endif default: return bpf_base_func_proto(func_id); } -- cgit v1.2.3