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Commit 1134158b authored by Craig Gallek's avatar Craig Gallek Committed by David S. Miller
Browse files

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: 538950a1 ("soreuseport: setsockopt SO_ATTACH_REUSEPORT_[CE]BPF")
Fixes: 3ca8e402 ("soreuseport: BPF selection functional test")
Suggested-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarCraig Gallek <kraig@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f0138e25

net/ipv4/udp.c

+6 −4
Original line number Diff line number Diff line
@@ -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 @@ static struct sock *udp4_lib_lookup2(struct net *net, 
				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;

net/ipv6/udp.c

+6 −4
Original line number Diff line number Diff line
@@ -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 @@ static struct sock *udp6_lib_lookup2(struct net *net, 
				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;

tools/testing/selftests/net/reuseport_bpf.c

+47 −0
Original line number Diff line number Diff line
@@ -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();