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net: core: Fix build with CONFIG_IPV6=m
Stephen Rothwell reports the following link failure with IPv6 as module: x86_64-linux-gnu-ld: net/core/filter.o: in function `sk_lookup': (.text+0x19219): undefined reference to `__udp6_lib_lookup' Fix the build by only enabling the IPv6 socket lookup if IPv6 support is compiled into the kernel. Signed-off-by: Joe Stringer <joe@wand.net.nz> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -4838,7 +4838,7 @@ struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
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sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
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dst4, tuple->ipv4.dport,
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dif, sdif, &udp_table, skb);
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#if IS_ENABLED(CONFIG_IPV6)
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#if IS_REACHABLE(CONFIG_IPV6)
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} else {
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struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
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struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
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