472 lines
12 KiB
C
472 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2013 Google Inc.
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* Author: Willem de Bruijn (willemb@google.com)
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*
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* A basic test of packet socket fanout behavior.
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*
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* Control:
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* - create fanout fails as expected with illegal flag combinations
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* - join fanout fails as expected with diverging types or flags
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*
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* Datapath:
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* Open a pair of packet sockets and a pair of INET sockets, send a known
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* number of packets across the two INET sockets and count the number of
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* packets enqueued onto the two packet sockets.
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*
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* The test currently runs for
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* - PACKET_FANOUT_HASH
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* - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
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* - PACKET_FANOUT_LB
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* - PACKET_FANOUT_CPU
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* - PACKET_FANOUT_ROLLOVER
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* - PACKET_FANOUT_CBPF
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* - PACKET_FANOUT_EBPF
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*
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* Todo:
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* - functionality: PACKET_FANOUT_FLAG_DEFRAG
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*/
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#define _GNU_SOURCE /* for sched_setaffinity */
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/unistd.h> /* for __NR_bpf */
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#include <linux/filter.h>
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#include <linux/bpf.h>
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#include <linux/if_packet.h>
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#include <net/if.h>
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#include <net/ethernet.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <poll.h>
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#include <sched.h>
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#include <stdint.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/mman.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "psock_lib.h"
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#define RING_NUM_FRAMES 20
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/* Open a socket in a given fanout mode.
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* @return -1 if mode is bad, a valid socket otherwise */
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static int sock_fanout_open(uint16_t typeflags, uint16_t group_id)
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{
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struct sockaddr_ll addr = {0};
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int fd, val;
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fd = socket(PF_PACKET, SOCK_RAW, 0);
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if (fd < 0) {
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perror("socket packet");
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exit(1);
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}
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pair_udp_setfilter(fd);
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addr.sll_family = AF_PACKET;
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addr.sll_protocol = htons(ETH_P_IP);
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addr.sll_ifindex = if_nametoindex("lo");
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if (addr.sll_ifindex == 0) {
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perror("if_nametoindex");
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exit(1);
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}
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if (bind(fd, (void *) &addr, sizeof(addr))) {
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perror("bind packet");
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exit(1);
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}
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val = (((int) typeflags) << 16) | group_id;
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if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
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if (close(fd)) {
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perror("close packet");
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exit(1);
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}
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return -1;
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}
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return fd;
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}
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static void sock_fanout_set_cbpf(int fd)
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{
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struct sock_filter bpf_filter[] = {
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BPF_STMT(BPF_LD+BPF_B+BPF_ABS, 80), /* ldb [80] */
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BPF_STMT(BPF_RET+BPF_A, 0), /* ret A */
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};
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struct sock_fprog bpf_prog;
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bpf_prog.filter = bpf_filter;
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bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
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if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog,
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sizeof(bpf_prog))) {
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perror("fanout data cbpf");
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exit(1);
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}
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}
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static void sock_fanout_getopts(int fd, uint16_t *typeflags, uint16_t *group_id)
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{
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int sockopt;
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socklen_t sockopt_len = sizeof(sockopt);
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if (getsockopt(fd, SOL_PACKET, PACKET_FANOUT,
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&sockopt, &sockopt_len)) {
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perror("failed to getsockopt");
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exit(1);
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}
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*typeflags = sockopt >> 16;
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*group_id = sockopt & 0xfffff;
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}
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static void sock_fanout_set_ebpf(int fd)
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{
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static char log_buf[65536];
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const int len_off = __builtin_offsetof(struct __sk_buff, len);
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struct bpf_insn prog[] = {
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{ BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 },
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{ BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 },
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{ BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN },
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{ BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 },
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{ BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 },
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{ BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR },
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{ BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 },
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{ BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 },
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{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
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};
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union bpf_attr attr;
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int pfd;
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memset(&attr, 0, sizeof(attr));
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attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
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attr.insns = (unsigned long) prog;
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attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
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attr.license = (unsigned long) "GPL";
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attr.log_buf = (unsigned long) log_buf,
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attr.log_size = sizeof(log_buf),
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attr.log_level = 1,
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pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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if (pfd < 0) {
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perror("bpf");
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fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
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exit(1);
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}
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if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
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perror("fanout data ebpf");
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exit(1);
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}
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if (close(pfd)) {
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perror("close ebpf");
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exit(1);
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}
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}
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static char *sock_fanout_open_ring(int fd)
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{
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struct tpacket_req req = {
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.tp_block_size = getpagesize(),
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.tp_frame_size = getpagesize(),
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.tp_block_nr = RING_NUM_FRAMES,
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.tp_frame_nr = RING_NUM_FRAMES,
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};
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char *ring;
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int val = TPACKET_V2;
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if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
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sizeof(val))) {
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perror("packetsock ring setsockopt version");
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exit(1);
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}
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if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
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sizeof(req))) {
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perror("packetsock ring setsockopt");
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exit(1);
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}
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ring = mmap(0, req.tp_block_size * req.tp_block_nr,
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PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (ring == MAP_FAILED) {
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perror("packetsock ring mmap");
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exit(1);
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}
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return ring;
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}
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static int sock_fanout_read_ring(int fd, void *ring)
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{
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struct tpacket2_hdr *header = ring;
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int count = 0;
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while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
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count++;
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header = ring + (count * getpagesize());
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}
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return count;
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}
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static int sock_fanout_read(int fds[], char *rings[], const int expect[])
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{
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int ret[2];
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ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
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ret[1] = sock_fanout_read_ring(fds[1], rings[1]);
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fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
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ret[0], ret[1], expect[0], expect[1]);
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if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
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(!(ret[0] == expect[1] && ret[1] == expect[0]))) {
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fprintf(stderr, "warning: incorrect queue lengths\n");
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return 1;
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}
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return 0;
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}
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/* Test illegal mode + flag combination */
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static void test_control_single(void)
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{
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fprintf(stderr, "test: control single socket\n");
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if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
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PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
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fprintf(stderr, "ERROR: opened socket with dual rollover\n");
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exit(1);
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}
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}
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/* Test illegal group with different modes or flags */
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static void test_control_group(void)
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{
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int fds[2];
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fprintf(stderr, "test: control multiple sockets\n");
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fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
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if (fds[0] == -1) {
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fprintf(stderr, "ERROR: failed to open HASH socket\n");
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exit(1);
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}
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if (sock_fanout_open(PACKET_FANOUT_HASH |
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PACKET_FANOUT_FLAG_DEFRAG, 0) != -1) {
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fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
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exit(1);
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}
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if (sock_fanout_open(PACKET_FANOUT_HASH |
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PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
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fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
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exit(1);
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}
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if (sock_fanout_open(PACKET_FANOUT_CPU, 0) != -1) {
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fprintf(stderr, "ERROR: joined group with wrong mode\n");
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exit(1);
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}
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fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
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if (fds[1] == -1) {
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fprintf(stderr, "ERROR: failed to join group\n");
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exit(1);
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}
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if (close(fds[1]) || close(fds[0])) {
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fprintf(stderr, "ERROR: closing sockets\n");
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exit(1);
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}
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}
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/* Test creating a unique fanout group ids */
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static void test_unique_fanout_group_ids(void)
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{
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int fds[3];
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uint16_t typeflags, first_group_id, second_group_id;
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fprintf(stderr, "test: unique ids\n");
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fds[0] = sock_fanout_open(PACKET_FANOUT_HASH |
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PACKET_FANOUT_FLAG_UNIQUEID, 0);
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if (fds[0] == -1) {
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fprintf(stderr, "ERROR: failed to create a unique id group.\n");
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exit(1);
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}
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sock_fanout_getopts(fds[0], &typeflags, &first_group_id);
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if (typeflags != PACKET_FANOUT_HASH) {
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fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags);
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exit(1);
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}
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if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {
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fprintf(stderr, "ERROR: joined group with wrong type.\n");
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exit(1);
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}
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fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id);
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if (fds[1] == -1) {
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fprintf(stderr,
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"ERROR: failed to join previously created group.\n");
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exit(1);
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}
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fds[2] = sock_fanout_open(PACKET_FANOUT_HASH |
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PACKET_FANOUT_FLAG_UNIQUEID, 0);
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if (fds[2] == -1) {
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fprintf(stderr,
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"ERROR: failed to create a second unique id group.\n");
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exit(1);
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}
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sock_fanout_getopts(fds[2], &typeflags, &second_group_id);
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if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID,
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second_group_id) != -1) {
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fprintf(stderr,
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"ERROR: specified a group id when requesting unique id\n");
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exit(1);
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}
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if (close(fds[0]) || close(fds[1]) || close(fds[2])) {
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fprintf(stderr, "ERROR: closing sockets\n");
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exit(1);
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}
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}
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static int test_datapath(uint16_t typeflags, int port_off,
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const int expect1[], const int expect2[])
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{
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const int expect0[] = { 0, 0 };
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char *rings[2];
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uint8_t type = typeflags & 0xFF;
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int fds[2], fds_udp[2][2], ret;
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fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n",
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typeflags, PORT_BASE, PORT_BASE + port_off);
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fds[0] = sock_fanout_open(typeflags, 0);
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fds[1] = sock_fanout_open(typeflags, 0);
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if (fds[0] == -1 || fds[1] == -1) {
|
||
|
|
fprintf(stderr, "ERROR: failed open\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (type == PACKET_FANOUT_CBPF)
|
||
|
|
sock_fanout_set_cbpf(fds[0]);
|
||
|
|
else if (type == PACKET_FANOUT_EBPF)
|
||
|
|
sock_fanout_set_ebpf(fds[0]);
|
||
|
|
|
||
|
|
rings[0] = sock_fanout_open_ring(fds[0]);
|
||
|
|
rings[1] = sock_fanout_open_ring(fds[1]);
|
||
|
|
pair_udp_open(fds_udp[0], PORT_BASE);
|
||
|
|
pair_udp_open(fds_udp[1], PORT_BASE + port_off);
|
||
|
|
sock_fanout_read(fds, rings, expect0);
|
||
|
|
|
||
|
|
/* Send data, but not enough to overflow a queue */
|
||
|
|
pair_udp_send(fds_udp[0], 15);
|
||
|
|
pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
|
||
|
|
ret = sock_fanout_read(fds, rings, expect1);
|
||
|
|
|
||
|
|
/* Send more data, overflow the queue */
|
||
|
|
pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);
|
||
|
|
/* TODO: ensure consistent order between expect1 and expect2 */
|
||
|
|
ret |= sock_fanout_read(fds, rings, expect2);
|
||
|
|
|
||
|
|
if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
|
||
|
|
munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
|
||
|
|
fprintf(stderr, "close rings\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
|
||
|
|
close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
|
||
|
|
close(fds[1]) || close(fds[0])) {
|
||
|
|
fprintf(stderr, "close datapath\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int set_cpuaffinity(int cpuid)
|
||
|
|
{
|
||
|
|
cpu_set_t mask;
|
||
|
|
|
||
|
|
CPU_ZERO(&mask);
|
||
|
|
CPU_SET(cpuid, &mask);
|
||
|
|
if (sched_setaffinity(0, sizeof(mask), &mask)) {
|
||
|
|
if (errno != EINVAL) {
|
||
|
|
fprintf(stderr, "setaffinity %d\n", cpuid);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } };
|
||
|
|
const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } };
|
||
|
|
const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } };
|
||
|
|
const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } };
|
||
|
|
const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };
|
||
|
|
const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } };
|
||
|
|
const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } };
|
||
|
|
const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } };
|
||
|
|
int port_off = 2, tries = 20, ret;
|
||
|
|
|
||
|
|
test_control_single();
|
||
|
|
test_control_group();
|
||
|
|
test_unique_fanout_group_ids();
|
||
|
|
|
||
|
|
/* find a set of ports that do not collide onto the same socket */
|
||
|
|
ret = test_datapath(PACKET_FANOUT_HASH, port_off,
|
||
|
|
expect_hash[0], expect_hash[1]);
|
||
|
|
while (ret) {
|
||
|
|
fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
|
||
|
|
ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
|
||
|
|
expect_hash[0], expect_hash[1]);
|
||
|
|
if (!--tries) {
|
||
|
|
fprintf(stderr, "too many collisions\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
|
||
|
|
port_off, expect_hash_rb[0], expect_hash_rb[1]);
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_LB,
|
||
|
|
port_off, expect_lb[0], expect_lb[1]);
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
|
||
|
|
port_off, expect_rb[0], expect_rb[1]);
|
||
|
|
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_CBPF,
|
||
|
|
port_off, expect_bpf[0], expect_bpf[1]);
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_EBPF,
|
||
|
|
port_off, expect_bpf[0], expect_bpf[1]);
|
||
|
|
|
||
|
|
set_cpuaffinity(0);
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
|
||
|
|
expect_cpu0[0], expect_cpu0[1]);
|
||
|
|
if (!set_cpuaffinity(1))
|
||
|
|
/* TODO: test that choice alternates with previous */
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
|
||
|
|
expect_cpu1[0], expect_cpu1[1]);
|
||
|
|
|
||
|
|
ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off,
|
||
|
|
expect_uniqueid[0], expect_uniqueid[1]);
|
||
|
|
|
||
|
|
if (ret)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
printf("OK. All tests passed\n");
|
||
|
|
return 0;
|
||
|
|
}
|