260 lines
6.6 KiB
C
260 lines
6.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Test functionality of BPF filters with SO_REUSEPORT. This program creates
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* an SO_REUSEPORT receiver group containing one socket per CPU core. It then
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* creates a BPF program that will select a socket from this group based
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* on the core id that receives the packet. The sending code artificially
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* moves itself to run on different core ids and sends one message from
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* each core. Since these packets are delivered over loopback, they should
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* arrive on the same core that sent them. The receiving code then ensures
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* that the packet was received on the socket for the corresponding core id.
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* This entire process is done for several different core id permutations
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* and for each IPv4/IPv6 and TCP/UDP combination.
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*/
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <errno.h>
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#include <error.h>
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#include <linux/filter.h>
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#include <linux/in.h>
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#include <linux/unistd.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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static const int PORT = 8888;
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static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
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{
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struct sockaddr_storage addr;
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struct sockaddr_in *addr4;
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struct sockaddr_in6 *addr6;
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size_t i;
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int opt;
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switch (family) {
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case AF_INET:
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addr4 = (struct sockaddr_in *)&addr;
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addr4->sin_family = AF_INET;
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addr4->sin_addr.s_addr = htonl(INADDR_ANY);
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addr4->sin_port = htons(PORT);
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break;
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case AF_INET6:
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addr6 = (struct sockaddr_in6 *)&addr;
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addr6->sin6_family = AF_INET6;
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addr6->sin6_addr = in6addr_any;
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addr6->sin6_port = htons(PORT);
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break;
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default:
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error(1, 0, "Unsupported family %d", family);
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}
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for (i = 0; i < len; ++i) {
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rcv_fd[i] = socket(family, proto, 0);
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if (rcv_fd[i] < 0)
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error(1, errno, "failed to create receive socket");
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opt = 1;
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if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
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sizeof(opt)))
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error(1, errno, "failed to set SO_REUSEPORT");
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if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
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error(1, errno, "failed to bind receive socket");
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if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
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error(1, errno, "failed to listen on receive port");
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}
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}
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static void attach_bpf(int fd)
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{
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struct sock_filter code[] = {
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/* A = raw_smp_processor_id() */
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{ BPF_LD | BPF_W | BPF_ABS, 0, 0, SKF_AD_OFF + SKF_AD_CPU },
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/* return A */
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{ BPF_RET | BPF_A, 0, 0, 0 },
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};
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struct sock_fprog p = {
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.len = 2,
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.filter = code,
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};
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_CBPF, &p, sizeof(p)))
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error(1, errno, "failed to set SO_ATTACH_REUSEPORT_CBPF");
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}
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static void send_from_cpu(int cpu_id, int family, int proto)
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{
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struct sockaddr_storage saddr, daddr;
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struct sockaddr_in *saddr4, *daddr4;
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struct sockaddr_in6 *saddr6, *daddr6;
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cpu_set_t cpu_set;
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int fd;
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switch (family) {
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case AF_INET:
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saddr4 = (struct sockaddr_in *)&saddr;
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saddr4->sin_family = AF_INET;
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saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
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saddr4->sin_port = 0;
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daddr4 = (struct sockaddr_in *)&daddr;
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daddr4->sin_family = AF_INET;
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daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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daddr4->sin_port = htons(PORT);
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break;
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case AF_INET6:
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saddr6 = (struct sockaddr_in6 *)&saddr;
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saddr6->sin6_family = AF_INET6;
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saddr6->sin6_addr = in6addr_any;
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saddr6->sin6_port = 0;
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daddr6 = (struct sockaddr_in6 *)&daddr;
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daddr6->sin6_family = AF_INET6;
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daddr6->sin6_addr = in6addr_loopback;
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daddr6->sin6_port = htons(PORT);
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break;
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default:
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error(1, 0, "Unsupported family %d", family);
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}
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memset(&cpu_set, 0, sizeof(cpu_set));
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CPU_SET(cpu_id, &cpu_set);
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0)
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error(1, errno, "failed to pin to cpu");
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fd = socket(family, proto, 0);
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if (fd < 0)
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error(1, errno, "failed to create send socket");
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if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
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error(1, errno, "failed to bind send socket");
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if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
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error(1, errno, "failed to connect send socket");
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if (send(fd, "a", 1, 0) < 0)
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error(1, errno, "failed to send message");
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close(fd);
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}
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static
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void receive_on_cpu(int *rcv_fd, int len, int epfd, int cpu_id, int proto)
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{
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struct epoll_event ev;
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int i, fd;
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char buf[8];
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i = epoll_wait(epfd, &ev, 1, -1);
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if (i < 0)
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error(1, errno, "epoll_wait failed");
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if (proto == SOCK_STREAM) {
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fd = accept(ev.data.fd, NULL, NULL);
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if (fd < 0)
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error(1, errno, "failed to accept");
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i = recv(fd, buf, sizeof(buf), 0);
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close(fd);
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} else {
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i = recv(ev.data.fd, buf, sizeof(buf), 0);
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}
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if (i < 0)
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error(1, errno, "failed to recv");
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for (i = 0; i < len; ++i)
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if (ev.data.fd == rcv_fd[i])
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break;
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if (i == len)
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error(1, 0, "failed to find socket");
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fprintf(stderr, "send cpu %d, receive socket %d\n", cpu_id, i);
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if (cpu_id != i)
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error(1, 0, "cpu id/receive socket mismatch");
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}
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static void test(int *rcv_fd, int len, int family, int proto)
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{
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struct epoll_event ev;
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int epfd, cpu;
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build_rcv_group(rcv_fd, len, family, proto);
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attach_bpf(rcv_fd[0]);
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epfd = epoll_create(1);
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if (epfd < 0)
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error(1, errno, "failed to create epoll");
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for (cpu = 0; cpu < len; ++cpu) {
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ev.events = EPOLLIN;
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ev.data.fd = rcv_fd[cpu];
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if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[cpu], &ev))
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error(1, errno, "failed to register sock epoll");
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}
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/* Forward iterate */
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for (cpu = 0; cpu < len; ++cpu) {
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send_from_cpu(cpu, family, proto);
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receive_on_cpu(rcv_fd, len, epfd, cpu, proto);
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}
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/* Reverse iterate */
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for (cpu = len - 1; cpu >= 0; --cpu) {
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send_from_cpu(cpu, family, proto);
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receive_on_cpu(rcv_fd, len, epfd, cpu, proto);
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}
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/* Even cores */
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for (cpu = 0; cpu < len; cpu += 2) {
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send_from_cpu(cpu, family, proto);
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receive_on_cpu(rcv_fd, len, epfd, cpu, proto);
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}
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/* Odd cores */
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for (cpu = 1; cpu < len; cpu += 2) {
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send_from_cpu(cpu, family, proto);
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receive_on_cpu(rcv_fd, len, epfd, cpu, proto);
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}
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close(epfd);
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for (cpu = 0; cpu < len; ++cpu)
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close(rcv_fd[cpu]);
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}
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int main(void)
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{
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int *rcv_fd, cpus;
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cpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (cpus <= 0)
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error(1, errno, "failed counting cpus");
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rcv_fd = calloc(cpus, sizeof(int));
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if (!rcv_fd)
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error(1, 0, "failed to allocate array");
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fprintf(stderr, "---- IPv4 UDP ----\n");
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test(rcv_fd, cpus, AF_INET, SOCK_DGRAM);
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fprintf(stderr, "---- IPv6 UDP ----\n");
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test(rcv_fd, cpus, AF_INET6, SOCK_DGRAM);
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fprintf(stderr, "---- IPv4 TCP ----\n");
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test(rcv_fd, cpus, AF_INET, SOCK_STREAM);
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fprintf(stderr, "---- IPv6 TCP ----\n");
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test(rcv_fd, cpus, AF_INET6, SOCK_STREAM);
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free(rcv_fd);
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fprintf(stderr, "SUCCESS\n");
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return 0;
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}
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