linux-kernel - [PATCH] netfilter: provide udp*_lib_lookup for nf

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Message-Id: <20180605114056.1239571-1-arnd@arndb.de>
Date:   Tue,  5 Jun 2018 13:40:34 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:     Máté Eckl <ecklm94@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...il.com>,
        Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] netfilter: provide udp*_lib_lookup for nf_tproxy

It is now possible to enable the libified nf_tproxy modules without
also enabling NETFILTER_XT_TARGET_TPROXY, which throws off the
ifdef logic in the udp core code:

net/ipv6/netfilter/nf_tproxy_ipv6.o: In function `nf_tproxy_get_sock_v6':
nf_tproxy_ipv6.c:(.text+0x1a8): undefined reference to `udp6_lib_lookup'
net/ipv4/netfilter/nf_tproxy_ipv4.o: In function `nf_tproxy_get_sock_v4':
nf_tproxy_ipv4.c:(.text+0x3d0): undefined reference to `udp4_lib_lookup'

We can actually simplify the conditions now to provide the two functions
exactly when they are needed.

Fixes: 45ca4e0cf273 ("netfilter: Libify xt_TPROXY")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 net/ipv4/udp.c | 4 +---
 net/ipv6/udp.c | 4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 4f16e5d71875..3365362cac88 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -544,9 +544,7 @@ EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb);
 /* Must be called under rcu_read_lock().
  * Does increment socket refcount.
  */
-#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
-    IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
-    IS_ENABLED(CONFIG_NF_SOCKET_IPV4)
+#if IS_ENABLED(CONFIG_NF_TPROXY_IPV4) || IS_ENABLED(CONFIG_NF_SOCKET_IPV4)
 struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 			     __be32 daddr, __be16 dport, int dif)
 {
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 967acff95bbe..164afd31aebf 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -285,9 +285,7 @@ EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
 /* Must be called under rcu_read_lock().
  * Does increment socket refcount.
  */
-#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
-    IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
-    IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
+#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
 			     const struct in6_addr *daddr, __be16 dport, int dif)
 {
-- 
2.9.0