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bpf: Allow sk_lookup with IPv6 module 

This is a more complete fix than d71019b54b ("net: core: Fix build
with CONFIG_IPV6=m"), so that IPv6 sockets may be looked up if the IPv6
module is loaded (not just if it's compiled in).

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Joe Stringer 2018-10-15 10:27:45 -07:00 committed by Alexei Starovoitov
parent d04fb13c9f
commit 8a615c6b03
3 changed files with 13 additions and 5 deletions
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5
include/net/addrconf.h
View File

@ -265,6 +265,11 @@ extern const struct ipv6_stub *ipv6_stub __read_mostly;
struct ipv6_bpf_stub {
int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
bool force_bind_address_no_port, bool with_lock);
struct sock *(*udp6_lib_lookup)(struct net *net,
const struct in6_addr *saddr, __be16 sport,
const struct in6_addr *daddr, __be16 dport,
int dif, int sdif, struct udp_table *tbl,
struct sk_buff *skb);
};
extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;

10
net/core/filter.c
View File

@ -4717,7 +4717,7 @@ static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
dst4, tuple->ipv4.dport,
dif, sdif, &udp_table, skb);
#if IS_REACHABLE(CONFIG_IPV6)
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
@ -4728,10 +4728,12 @@ static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
src6, tuple->ipv6.sport,
dst6, tuple->ipv6.dport,
dif, sdif, &refcounted);
else
sk = __udp6_lib_lookup(net, src6, tuple->ipv6.sport,
else if (likely(ipv6_bpf_stub))
sk = ipv6_bpf_stub->udp6_lib_lookup(net,
src6, tuple->ipv6.sport,
dst6, tuple->ipv6.dport,
dif, sdif, &udp_table, skb);
dif, sdif,
&udp_table, skb);
#endif
}

1
net/ipv6/af_inet6.c
View File

@ -901,6 +901,7 @@ static const struct ipv6_stub ipv6_stub_impl = {
static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
.inet6_bind = __inet6_bind,
.udp6_lib_lookup = __udp6_lib_lookup,
};
static int __init inet6_init(void)