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538 lines
14 KiB
538 lines
14 KiB
// 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 ([email protected]) |
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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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static uint32_t cfg_max_num_members; |
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|
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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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struct fanout_args args; |
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int fd, val, err; |
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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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if (cfg_max_num_members) { |
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args.id = group_id; |
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args.type_flags = typeflags; |
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args.max_num_members = cfg_max_num_members; |
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err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &args, |
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sizeof(args)); |
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} else { |
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val = (((int) typeflags) << 16) | group_id; |
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err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, |
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sizeof(val)); |
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} |
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if (err) { |
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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 illegal max_num_members values */ |
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static void test_control_group_max_num_members(void) |
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{ |
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int fds[3]; |
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fprintf(stderr, "test: control multiple sockets, max_num_members\n"); |
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/* expected failure on greater than PACKET_FANOUT_MAX */ |
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cfg_max_num_members = (1 << 16) + 1; |
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if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) { |
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fprintf(stderr, "ERROR: max_num_members > PACKET_FANOUT_MAX\n"); |
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exit(1); |
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} |
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cfg_max_num_members = 256; |
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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 open\n"); |
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exit(1); |
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} |
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/* expected failure on joining group with different max_num_members */ |
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cfg_max_num_members = 257; |
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if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) { |
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fprintf(stderr, "ERROR: set different max_num_members\n"); |
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exit(1); |
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} |
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/* success on joining group with same max_num_members */ |
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cfg_max_num_members = 256; |
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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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/* success on joining group with max_num_members unspecified */ |
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cfg_max_num_members = 0; |
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fds[2] = sock_fanout_open(PACKET_FANOUT_HASH, 0); |
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if (fds[2] == -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[2]) || 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, (uint16_t)PORT_BASE, |
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(uint16_t)(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) { |
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fprintf(stderr, "ERROR: failed open\n"); |
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exit(1); |
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} |
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if (type == PACKET_FANOUT_CBPF) |
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sock_fanout_set_cbpf(fds[0]); |
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else if (type == PACKET_FANOUT_EBPF) |
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sock_fanout_set_ebpf(fds[0]); |
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rings[0] = sock_fanout_open_ring(fds[0]); |
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rings[1] = sock_fanout_open_ring(fds[1]); |
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pair_udp_open(fds_udp[0], PORT_BASE); |
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pair_udp_open(fds_udp[1], PORT_BASE + port_off); |
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sock_fanout_read(fds, rings, expect0); |
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/* Send data, but not enough to overflow a queue */ |
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pair_udp_send(fds_udp[0], 15); |
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pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1); |
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ret = sock_fanout_read(fds, rings, expect1); |
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/* Send more data, overflow the queue */ |
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pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1); |
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/* TODO: ensure consistent order between expect1 and expect2 */ |
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ret |= sock_fanout_read(fds, rings, expect2); |
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|
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if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) || |
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munmap(rings[0], RING_NUM_FRAMES * getpagesize())) { |
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fprintf(stderr, "close rings\n"); |
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exit(1); |
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} |
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if (close(fds_udp[1][1]) || close(fds_udp[1][0]) || |
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close(fds_udp[0][1]) || close(fds_udp[0][0]) || |
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close(fds[1]) || close(fds[0])) { |
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fprintf(stderr, "close datapath\n"); |
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exit(1); |
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} |
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return ret; |
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} |
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static int set_cpuaffinity(int cpuid) |
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{ |
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cpu_set_t mask; |
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CPU_ZERO(&mask); |
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CPU_SET(cpuid, &mask); |
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if (sched_setaffinity(0, sizeof(mask), &mask)) { |
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if (errno != EINVAL) { |
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fprintf(stderr, "setaffinity %d\n", cpuid); |
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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 0; |
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} |
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int main(int argc, char **argv) |
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{ |
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const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } }; |
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const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } }; |
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const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } }; |
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const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } }; |
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const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } }; |
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const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } }; |
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const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } }; |
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const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } }; |
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int port_off = 2, tries = 20, ret; |
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|
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test_control_single(); |
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test_control_group(); |
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test_control_group_max_num_members(); |
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test_unique_fanout_group_ids(); |
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/* PACKET_FANOUT_MAX */ |
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cfg_max_num_members = 1 << 16; |
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/* find a set of ports that do not collide onto the same socket */ |
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ret = test_datapath(PACKET_FANOUT_HASH, port_off, |
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expect_hash[0], expect_hash[1]); |
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while (ret) { |
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fprintf(stderr, "info: trying alternate ports (%d)\n", tries); |
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ret = test_datapath(PACKET_FANOUT_HASH, ++port_off, |
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expect_hash[0], expect_hash[1]); |
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if (!--tries) { |
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fprintf(stderr, "too many collisions\n"); |
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return 1; |
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} |
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} |
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|
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ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, |
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port_off, expect_hash_rb[0], expect_hash_rb[1]); |
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ret |= test_datapath(PACKET_FANOUT_LB, |
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port_off, expect_lb[0], expect_lb[1]); |
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ret |= test_datapath(PACKET_FANOUT_ROLLOVER, |
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port_off, expect_rb[0], expect_rb[1]); |
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|
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ret |= test_datapath(PACKET_FANOUT_CBPF, |
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port_off, expect_bpf[0], expect_bpf[1]); |
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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; |
|
}
|
|
|