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soreuseport: pass skb to secondary UDP socket lookup 

This socket-lookup path did not pass along the skb in question
in my original BPF-based socket selection patch.  The skb in the
udpN_lib_lookup2 path can be used for BPF-based socket selection just
like it is in the 'traditional' udpN_lib_lookup path.

udpN_lib_lookup2 kicks in when there are greater than 10 sockets in
the same hlist slot.  Coincidentally, I chose 10 sockets per
reuseport group in my functional test, so the lookup2 path was not
excersised. This adds an additional set of tests with 20 sockets.

Fixes: 538950a1b7 ("soreuseport: setsockopt SO_ATTACH_REUSEPORT_[CE]BPF")
Fixes: 3ca8e40299 ("soreuseport: BPF selection functional test")
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Gallek 2016-01-05 15:08:07 -05:00 коммит произвёл David S. Miller
Родитель f0138e2596
Коммит 1134158ba3
3 изменённых файлов: 59 добавлений и 8 удалений
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10
net/ipv4/udp.c
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@ -493,7 +493,8 @@ static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
static struct sock *udp4_lib_lookup2(struct net *net,
__be32 saddr, __be16 sport,
__be32 daddr, unsigned int hnum, int dif,
struct udp_hslot *hslot2, unsigned int slot2)
struct udp_hslot *hslot2, unsigned int slot2,
struct sk_buff *skb)
{
struct sock *sk, *result;
struct hlist_nulls_node *node;
@ -514,7 +515,8 @@ begin:
struct sock *sk2;
hash = udp_ehashfn(net, daddr, hnum,
saddr, sport);
sk2 = reuseport_select_sock(sk, hash, NULL, 0);
sk2 = reuseport_select_sock(sk, hash, skb,
sizeof(struct udphdr));
if (sk2) {
result = sk2;
goto found;
@ -573,7 +575,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
result = udp4_lib_lookup2(net, saddr, sport,
daddr, hnum, dif,
hslot2, slot2);
hslot2, slot2, skb);
if (!result) {
hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
slot2 = hash2 & udptable->mask;
@ -583,7 +585,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
result = udp4_lib_lookup2(net, saddr, sport,
htonl(INADDR_ANY), hnum, dif,
hslot2, slot2);
hslot2, slot2, skb);
}
rcu_read_unlock();
return result;

10
net/ipv6/udp.c
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@ -251,7 +251,8 @@ static inline int compute_score2(struct sock *sk, struct net *net,
static struct sock *udp6_lib_lookup2(struct net *net,
const struct in6_addr *saddr, __be16 sport,
const struct in6_addr *daddr, unsigned int hnum, int dif,
struct udp_hslot *hslot2, unsigned int slot2)
struct udp_hslot *hslot2, unsigned int slot2,
struct sk_buff *skb)
{
struct sock *sk, *result;
struct hlist_nulls_node *node;
@ -272,7 +273,8 @@ begin:
struct sock *sk2;
hash = udp6_ehashfn(net, daddr, hnum,
saddr, sport);
sk2 = reuseport_select_sock(sk, hash, NULL, 0);
sk2 = reuseport_select_sock(sk, hash, skb,
sizeof(struct udphdr));
if (sk2) {
result = sk2;
goto found;
@ -331,7 +333,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
result = udp6_lib_lookup2(net, saddr, sport,
daddr, hnum, dif,
hslot2, slot2);
hslot2, slot2, skb);
if (!result) {
hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
slot2 = hash2 & udptable->mask;
@ -341,7 +343,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
result = udp6_lib_lookup2(net, saddr, sport,
&in6addr_any, hnum, dif,
hslot2, slot2);
hslot2, slot2, skb);
}
rcu_read_unlock();
return result;

47
tools/testing/selftests/net/reuseport_bpf.c
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@ -123,6 +123,8 @@ static void attach_ebpf(int fd, uint16_t mod)
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
sizeof(bpf_fd)))
error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");
close(bpf_fd);
}
static void attach_cbpf(int fd, uint16_t mod)
@ -396,6 +398,9 @@ static void test_filter_without_bind(void)
int main(void)
{
fprintf(stderr, "---- IPv4 UDP ----\n");
/* NOTE: UDP socket lookups traverse a different code path when there
* are > 10 sockets in a group. Run the bpf test through both paths.
*/
test_reuseport_ebpf((struct test_params) {
.recv_family = AF_INET,
.send_family = AF_INET,
@ -403,6 +408,13 @@ int main(void)
.recv_socks = 10,
.recv_port = 8000,
.send_port_min = 9000});
test_reuseport_ebpf((struct test_params) {
.recv_family = AF_INET,
.send_family = AF_INET,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8000,
.send_port_min = 9000});
test_reuseport_cbpf((struct test_params) {
.recv_family = AF_INET,
.send_family = AF_INET,
@ -410,6 +422,13 @@ int main(void)
.recv_socks = 10,
.recv_port = 8001,
.send_port_min = 9020});
test_reuseport_cbpf((struct test_params) {
.recv_family = AF_INET,
.send_family = AF_INET,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8001,
.send_port_min = 9020});
test_extra_filter((struct test_params) {
.recv_family = AF_INET,
.protocol = SOCK_DGRAM,
@ -427,6 +446,13 @@ int main(void)
.recv_socks = 10,
.recv_port = 8003,
.send_port_min = 9040});
test_reuseport_ebpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET6,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8003,
.send_port_min = 9040});
test_reuseport_cbpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET6,
@ -434,6 +460,13 @@ int main(void)
.recv_socks = 10,
.recv_port = 8004,
.send_port_min = 9060});
test_reuseport_cbpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET6,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8004,
.send_port_min = 9060});
test_extra_filter((struct test_params) {
.recv_family = AF_INET6,
.protocol = SOCK_DGRAM,
@ -444,6 +477,13 @@ int main(void)
.recv_port = 8009});
fprintf(stderr, "---- IPv6 UDP w/ mapped IPv4 ----\n");
test_reuseport_ebpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8006,
.send_port_min = 9080});
test_reuseport_ebpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET,
@ -458,6 +498,13 @@ int main(void)
.recv_socks = 10,
.recv_port = 8007,
.send_port_min = 9100});
test_reuseport_cbpf((struct test_params) {
.recv_family = AF_INET6,
.send_family = AF_INET,
.protocol = SOCK_DGRAM,
.recv_socks = 20,
.recv_port = 8007,
.send_port_min = 9100});
test_filter_without_bind();