tools/testing/selftests/net/reuseport_bpf_numa.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Test functionality of BPF filters with SO_REUSEPORT. Same test as
   4  * in reuseport_bpf_cpu, only as one socket per NUMA node.
   5  */
   6
   7 #define _GNU_SOURCE
   8
   9 #include <arpa/inet.h>
  10 #include <errno.h>
  11 #include <error.h>
  12 #include <linux/filter.h>
  13 #include <linux/bpf.h>
  14 #include <linux/in.h>
  15 #include <linux/unistd.h>
  16 #include <sched.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/epoll.h>
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <unistd.h>
  24 #include <numa.h>
  25
  26 static const int PORT = 8888;
  27
  28 static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
  29 {
  30         struct sockaddr_storage addr;
  31         struct sockaddr_in  *addr4;
  32         struct sockaddr_in6 *addr6;
  33         size_t i;
  34         int opt;
  35
  36         switch (family) {
  37         case AF_INET:
  38                 addr4 = (struct sockaddr_in *)&addr;
  39                 addr4->sin_family = AF_INET;
  40                 addr4->sin_addr.s_addr = htonl(INADDR_ANY);
  41                 addr4->sin_port = htons(PORT);
  42                 break;
  43         case AF_INET6:
  44                 addr6 = (struct sockaddr_in6 *)&addr;
  45                 addr6->sin6_family = AF_INET6;
  46                 addr6->sin6_addr = in6addr_any;
  47                 addr6->sin6_port = htons(PORT);
  48                 break;
  49         default:
  50                 error(1, 0, "Unsupported family %d", family);
  51         }
  52
  53         for (i = 0; i < len; ++i) {
  54                 rcv_fd[i] = socket(family, proto, 0);
  55                 if (rcv_fd[i] < 0)
  56                         error(1, errno, "failed to create receive socket");
  57
  58                 opt = 1;
  59                 if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
  60                                sizeof(opt)))
  61                         error(1, errno, "failed to set SO_REUSEPORT");
  62
  63                 if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
  64                         error(1, errno, "failed to bind receive socket");
  65
  66                 if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
  67                         error(1, errno, "failed to listen on receive port");
  68         }
  69 }
  70
  71 static void attach_bpf(int fd)
  72 {
  73         static char bpf_log_buf[65536];
  74         static const char bpf_license[] = "";
  75
  76         int bpf_fd;
  77         const struct bpf_insn prog[] = {
  78                 /* R0 = bpf_get_numa_node_id() */
  79                 { BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
  80                 /* return R0 */
  81                 { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
  82         };
  83         union bpf_attr attr;
  84
  85         memset(&attr, 0, sizeof(attr));
  86         attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
  87         attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
  88         attr.insns = (unsigned long) &prog;
  89         attr.license = (unsigned long) &bpf_license;
  90         attr.log_buf = (unsigned long) &bpf_log_buf;
  91         attr.log_size = sizeof(bpf_log_buf);
  92         attr.log_level = 1;
  93
  94         bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
  95         if (bpf_fd < 0)
  96                 error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);
  97
  98         if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
  99                         sizeof(bpf_fd)))
 100                 error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");
 101
 102         close(bpf_fd);
 103 }
 104
 105 static void send_from_node(int node_id, int family, int proto)
 106 {
 107         struct sockaddr_storage saddr, daddr;
 108         struct sockaddr_in  *saddr4, *daddr4;
 109         struct sockaddr_in6 *saddr6, *daddr6;
 110         int fd;
 111
 112         switch (family) {
 113         case AF_INET:
 114                 saddr4 = (struct sockaddr_in *)&saddr;
 115                 saddr4->sin_family = AF_INET;
 116                 saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
 117                 saddr4->sin_port = 0;
 118
 119                 daddr4 = (struct sockaddr_in *)&daddr;
 120                 daddr4->sin_family = AF_INET;
 121                 daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 122                 daddr4->sin_port = htons(PORT);
 123                 break;
 124         case AF_INET6:
 125                 saddr6 = (struct sockaddr_in6 *)&saddr;
 126                 saddr6->sin6_family = AF_INET6;
 127                 saddr6->sin6_addr = in6addr_any;
 128                 saddr6->sin6_port = 0;
 129
 130                 daddr6 = (struct sockaddr_in6 *)&daddr;
 131                 daddr6->sin6_family = AF_INET6;
 132                 daddr6->sin6_addr = in6addr_loopback;
 133                 daddr6->sin6_port = htons(PORT);
 134                 break;
 135         default:
 136                 error(1, 0, "Unsupported family %d", family);
 137         }
 138
 139         if (numa_run_on_node(node_id) < 0)
 140                 error(1, errno, "failed to pin to node");
 141
 142         fd = socket(family, proto, 0);
 143         if (fd < 0)
 144                 error(1, errno, "failed to create send socket");
 145
 146         if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
 147                 error(1, errno, "failed to bind send socket");
 148
 149         if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
 150                 error(1, errno, "failed to connect send socket");
 151
 152         if (send(fd, "a", 1, 0) < 0)
 153                 error(1, errno, "failed to send message");
 154
 155         close(fd);
 156 }
 157
 158 static
 159 void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
 160 {
 161         struct epoll_event ev;
 162         int i, fd;
 163         char buf[8];
 164
 165         i = epoll_wait(epfd, &ev, 1, -1);
 166         if (i < 0)
 167                 error(1, errno, "epoll_wait failed");
 168
 169         if (proto == SOCK_STREAM) {
 170                 fd = accept(ev.data.fd, NULL, NULL);
 171                 if (fd < 0)
 172                         error(1, errno, "failed to accept");
 173                 i = recv(fd, buf, sizeof(buf), 0);
 174                 close(fd);
 175         } else {
 176                 i = recv(ev.data.fd, buf, sizeof(buf), 0);
 177         }
 178
 179         if (i < 0)
 180                 error(1, errno, "failed to recv");
 181
 182         for (i = 0; i < len; ++i)
 183                 if (ev.data.fd == rcv_fd[i])
 184                         break;
 185         if (i == len)
 186                 error(1, 0, "failed to find socket");
 187         fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
 188         if (node_id != i)
 189                 error(1, 0, "node id/receive socket mismatch");
 190 }
 191
 192 static void test(int *rcv_fd, int len, int family, int proto)
 193 {
 194         struct epoll_event ev;
 195         int epfd, node;
 196
 197         build_rcv_group(rcv_fd, len, family, proto);
 198         attach_bpf(rcv_fd[0]);
 199
 200         epfd = epoll_create(1);
 201         if (epfd < 0)
 202                 error(1, errno, "failed to create epoll");
 203         for (node = 0; node < len; ++node) {
 204                 ev.events = EPOLLIN;
 205                 ev.data.fd = rcv_fd[node];
 206                 if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
 207                         error(1, errno, "failed to register sock epoll");
 208         }
 209
 210         /* Forward iterate */
 211         for (node = 0; node < len; ++node) {
 212                 send_from_node(node, family, proto);
 213                 receive_on_node(rcv_fd, len, epfd, node, proto);
 214         }
 215
 216         /* Reverse iterate */
 217         for (node = len - 1; node >= 0; --node) {
 218                 send_from_node(node, family, proto);
 219                 receive_on_node(rcv_fd, len, epfd, node, proto);
 220         }
 221
 222         close(epfd);
 223         for (node = 0; node < len; ++node)
 224                 close(rcv_fd[node]);
 225 }
 226
 227 int main(void)
 228 {
 229         int *rcv_fd, nodes;
 230
 231         if (numa_available() < 0)
 232                 error(1, errno, "no numa api support");
 233
 234         nodes = numa_max_node() + 1;
 235
 236         rcv_fd = calloc(nodes, sizeof(int));
 237         if (!rcv_fd)
 238                 error(1, 0, "failed to allocate array");
 239
 240         fprintf(stderr, "---- IPv4 UDP ----\n");
 241         test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);
 242
 243         fprintf(stderr, "---- IPv6 UDP ----\n");
 244         test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);
 245
 246         fprintf(stderr, "---- IPv4 TCP ----\n");
 247         test(rcv_fd, nodes, AF_INET, SOCK_STREAM);
 248
 249         fprintf(stderr, "---- IPv6 TCP ----\n");
 250         test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);
 251
 252         free(rcv_fd);
 253
 254         fprintf(stderr, "SUCCESS\n");
 255         return 0;
 256 }