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// SPDX-License-Identifier: GPL-2.0
/*
* Test functionality of BPF filters with SO_REUSEPORT. Same test as
* in reuseport_bpf_cpu, only as one socket per NUMA node.
*/
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <linux/unistd.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <numa.h>
static const int PORT = 8888;
static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
{
struct sockaddr_storage addr;
struct sockaddr_in *addr4;
struct sockaddr_in6 *addr6;
size_t i;
int opt;
switch (family) {
case AF_INET:
addr4 = (struct sockaddr_in *)&addr;
addr4->sin_family = AF_INET;
addr4->sin_addr.s_addr = htonl(INADDR_ANY);
addr4->sin_port = htons(PORT);
break;
case AF_INET6:
addr6 = (struct sockaddr_in6 *)&addr;
addr6->sin6_family = AF_INET6;
addr6->sin6_addr = in6addr_any;
addr6->sin6_port = htons(PORT);
break;
default:
error(1, 0, "Unsupported family %d", family);
}
for (i = 0; i < len; ++i) {
rcv_fd[i] = socket(family, proto, 0);
if (rcv_fd[i] < 0)
error(1, errno, "failed to create receive socket");
opt = 1;
if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
sizeof(opt)))
error(1, errno, "failed to set SO_REUSEPORT");
if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
error(1, errno, "failed to bind receive socket");
if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
error(1, errno, "failed to listen on receive port");
}
}
static void attach_bpf(int fd)
{
static char bpf_log_buf[65536];
static const char bpf_license[] = "";
int bpf_fd;
const struct bpf_insn prog[] = {
/* R0 = bpf_get_numa_node_id() */
{ BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
/* return R0 */
{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
};
union bpf_attr attr;
memset(&attr, 0, sizeof(attr));
attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
attr.insns = (unsigned long) &prog;
attr.license = (unsigned long) &bpf_license;
attr.log_buf = (unsigned long) &bpf_log_buf;
attr.log_size = sizeof(bpf_log_buf);
attr.log_level = 1;
bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
if (bpf_fd < 0)
error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);
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 send_from_node(int node_id, int family, int proto)
{
struct sockaddr_storage saddr, daddr;
struct sockaddr_in *saddr4, *daddr4;
struct sockaddr_in6 *saddr6, *daddr6;
int fd;
switch (family) {
case AF_INET:
saddr4 = (struct sockaddr_in *)&saddr;
saddr4->sin_family = AF_INET;
saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
saddr4->sin_port = 0;
daddr4 = (struct sockaddr_in *)&daddr;
daddr4->sin_family = AF_INET;
daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
daddr4->sin_port = htons(PORT);
break;
case AF_INET6:
saddr6 = (struct sockaddr_in6 *)&saddr;
saddr6->sin6_family = AF_INET6;
saddr6->sin6_addr = in6addr_any;
saddr6->sin6_port = 0;
daddr6 = (struct sockaddr_in6 *)&daddr;
daddr6->sin6_family = AF_INET6;
daddr6->sin6_addr = in6addr_loopback;
daddr6->sin6_port = htons(PORT);
break;
default:
error(1, 0, "Unsupported family %d", family);
}
if (numa_run_on_node(node_id) < 0)
error(1, errno, "failed to pin to node");
fd = socket(family, proto, 0);
if (fd < 0)
error(1, errno, "failed to create send socket");
if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
error(1, errno, "failed to bind send socket");
if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
error(1, errno, "failed to connect send socket");
if (send(fd, "a", 1, 0) < 0)
error(1, errno, "failed to send message");
close(fd);
}
static
void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
{
struct epoll_event ev;
int i, fd;
char buf[8];
i = epoll_wait(epfd, &ev, 1, -1);
if (i < 0)
error(1, errno, "epoll_wait failed");
if (proto == SOCK_STREAM) {
fd = accept(ev.data.fd, NULL, NULL);
if (fd < 0)
error(1, errno, "failed to accept");
i = recv(fd, buf, sizeof(buf), 0);
close(fd);
} else {
i = recv(ev.data.fd, buf, sizeof(buf), 0);
}
if (i < 0)
error(1, errno, "failed to recv");
for (i = 0; i < len; ++i)
if (ev.data.fd == rcv_fd[i])
break;
if (i == len)
error(1, 0, "failed to find socket");
fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
if (node_id != i)
error(1, 0, "node id/receive socket mismatch");
}
static void test(int *rcv_fd, int len, int family, int proto)
{
struct epoll_event ev;
int epfd, node;
build_rcv_group(rcv_fd, len, family, proto);
attach_bpf(rcv_fd[0]);
epfd = epoll_create(1);
if (epfd < 0)
error(1, errno, "failed to create epoll");
for (node = 0; node < len; ++node) {
ev.events = EPOLLIN;
ev.data.fd = rcv_fd[node];
if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
error(1, errno, "failed to register sock epoll");
}
/* Forward iterate */
for (node = 0; node < len; ++node) {
send_from_node(node, family, proto);
receive_on_node(rcv_fd, len, epfd, node, proto);
}
/* Reverse iterate */
for (node = len - 1; node >= 0; --node) {
send_from_node(node, family, proto);
receive_on_node(rcv_fd, len, epfd, node, proto);
}
close(epfd);
for (node = 0; node < len; ++node)
close(rcv_fd[node]);
}
int main(void)
{
int *rcv_fd, nodes;
if (numa_available() < 0)
error(1, errno, "no numa api support");
nodes = numa_max_node() + 1;
rcv_fd = calloc(nodes, sizeof(int));
if (!rcv_fd)
error(1, 0, "failed to allocate array");
fprintf(stderr, "---- IPv4 UDP ----\n");
test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);
fprintf(stderr, "---- IPv6 UDP ----\n");
test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);
fprintf(stderr, "---- IPv4 TCP ----\n");
test(rcv_fd, nodes, AF_INET, SOCK_STREAM);
fprintf(stderr, "---- IPv6 TCP ----\n");
test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);
free(rcv_fd);
fprintf(stderr, "SUCCESS\n");
return 0;
}
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