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-rw-r--r--tools/testing/selftests/net/psock_fanout.c539
1 files changed, 539 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/psock_fanout.c b/tools/testing/selftests/net/psock_fanout.c
new file mode 100644
index 000000000..1a736f700
--- /dev/null
+++ b/tools/testing/selftests/net/psock_fanout.c
@@ -0,0 +1,539 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2013 Google Inc.
+ * Author: Willem de Bruijn (willemb@google.com)
+ *
+ * A basic test of packet socket fanout behavior.
+ *
+ * Control:
+ * - create fanout fails as expected with illegal flag combinations
+ * - join fanout fails as expected with diverging types or flags
+ *
+ * Datapath:
+ * Open a pair of packet sockets and a pair of INET sockets, send a known
+ * number of packets across the two INET sockets and count the number of
+ * packets enqueued onto the two packet sockets.
+ *
+ * The test currently runs for
+ * - PACKET_FANOUT_HASH
+ * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
+ * - PACKET_FANOUT_LB
+ * - PACKET_FANOUT_CPU
+ * - PACKET_FANOUT_ROLLOVER
+ * - PACKET_FANOUT_CBPF
+ * - PACKET_FANOUT_EBPF
+ *
+ * Todo:
+ * - functionality: PACKET_FANOUT_FLAG_DEFRAG
+ */
+
+#define _GNU_SOURCE /* for sched_setaffinity */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/unistd.h> /* for __NR_bpf */
+#include <linux/filter.h>
+#include <linux/bpf.h>
+#include <linux/if_packet.h>
+#include <net/if.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <poll.h>
+#include <sched.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "psock_lib.h"
+#include "../kselftest.h"
+
+#define RING_NUM_FRAMES 20
+
+static uint32_t cfg_max_num_members;
+
+/* Open a socket in a given fanout mode.
+ * @return -1 if mode is bad, a valid socket otherwise */
+static int sock_fanout_open(uint16_t typeflags, uint16_t group_id)
+{
+ struct sockaddr_ll addr = {0};
+ struct fanout_args args;
+ int fd, val, err;
+
+ fd = socket(PF_PACKET, SOCK_RAW, 0);
+ if (fd < 0) {
+ perror("socket packet");
+ exit(1);
+ }
+
+ pair_udp_setfilter(fd);
+
+ addr.sll_family = AF_PACKET;
+ addr.sll_protocol = htons(ETH_P_IP);
+ addr.sll_ifindex = if_nametoindex("lo");
+ if (addr.sll_ifindex == 0) {
+ perror("if_nametoindex");
+ exit(1);
+ }
+ if (bind(fd, (void *) &addr, sizeof(addr))) {
+ perror("bind packet");
+ exit(1);
+ }
+
+ if (cfg_max_num_members) {
+ args.id = group_id;
+ args.type_flags = typeflags;
+ args.max_num_members = cfg_max_num_members;
+ err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &args,
+ sizeof(args));
+ } else {
+ val = (((int) typeflags) << 16) | group_id;
+ err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val,
+ sizeof(val));
+ }
+ if (err) {
+ if (close(fd)) {
+ perror("close packet");
+ exit(1);
+ }
+ return -1;
+ }
+
+ return fd;
+}
+
+static void sock_fanout_set_cbpf(int fd)
+{
+ struct sock_filter bpf_filter[] = {
+ BPF_STMT(BPF_LD | BPF_B | BPF_ABS, 80), /* ldb [80] */
+ BPF_STMT(BPF_RET | BPF_A, 0), /* ret A */
+ };
+ struct sock_fprog bpf_prog;
+
+ bpf_prog.filter = bpf_filter;
+ bpf_prog.len = ARRAY_SIZE(bpf_filter);
+
+ if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog,
+ sizeof(bpf_prog))) {
+ perror("fanout data cbpf");
+ exit(1);
+ }
+}
+
+static void sock_fanout_getopts(int fd, uint16_t *typeflags, uint16_t *group_id)
+{
+ int sockopt;
+ socklen_t sockopt_len = sizeof(sockopt);
+
+ if (getsockopt(fd, SOL_PACKET, PACKET_FANOUT,
+ &sockopt, &sockopt_len)) {
+ perror("failed to getsockopt");
+ exit(1);
+ }
+ *typeflags = sockopt >> 16;
+ *group_id = sockopt & 0xfffff;
+}
+
+static void sock_fanout_set_ebpf(int fd)
+{
+ static char log_buf[65536];
+
+ const int len_off = __builtin_offsetof(struct __sk_buff, len);
+ struct bpf_insn prog[] = {
+ { BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 },
+ { BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 },
+ { BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN },
+ { BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 },
+ { BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 },
+ { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR },
+ { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 },
+ { BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 },
+ { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
+ };
+ union bpf_attr attr;
+ int pfd;
+
+ memset(&attr, 0, sizeof(attr));
+ attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
+ attr.insns = (unsigned long) prog;
+ attr.insn_cnt = ARRAY_SIZE(prog);
+ attr.license = (unsigned long) "GPL";
+ attr.log_buf = (unsigned long) log_buf,
+ attr.log_size = sizeof(log_buf),
+ attr.log_level = 1,
+
+ pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
+ if (pfd < 0) {
+ perror("bpf");
+ fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
+ exit(1);
+ }
+
+ if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
+ perror("fanout data ebpf");
+ exit(1);
+ }
+
+ if (close(pfd)) {
+ perror("close ebpf");
+ exit(1);
+ }
+}
+
+static char *sock_fanout_open_ring(int fd)
+{
+ struct tpacket_req req = {
+ .tp_block_size = getpagesize(),
+ .tp_frame_size = getpagesize(),
+ .tp_block_nr = RING_NUM_FRAMES,
+ .tp_frame_nr = RING_NUM_FRAMES,
+ };
+ char *ring;
+ int val = TPACKET_V2;
+
+ if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
+ sizeof(val))) {
+ perror("packetsock ring setsockopt version");
+ exit(1);
+ }
+ if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
+ sizeof(req))) {
+ perror("packetsock ring setsockopt");
+ exit(1);
+ }
+
+ ring = mmap(0, req.tp_block_size * req.tp_block_nr,
+ PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (ring == MAP_FAILED) {
+ perror("packetsock ring mmap");
+ exit(1);
+ }
+
+ return ring;
+}
+
+static int sock_fanout_read_ring(int fd, void *ring)
+{
+ struct tpacket2_hdr *header = ring;
+ int count = 0;
+
+ while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
+ count++;
+ header = ring + (count * getpagesize());
+ }
+
+ return count;
+}
+
+static int sock_fanout_read(int fds[], char *rings[], const int expect[])
+{
+ int ret[2];
+
+ ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
+ ret[1] = sock_fanout_read_ring(fds[1], rings[1]);
+
+ fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
+ ret[0], ret[1], expect[0], expect[1]);
+
+ if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
+ (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
+ fprintf(stderr, "warning: incorrect queue lengths\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+/* Test illegal mode + flag combination */
+static void test_control_single(void)
+{
+ fprintf(stderr, "test: control single socket\n");
+
+ if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
+ PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
+ fprintf(stderr, "ERROR: opened socket with dual rollover\n");
+ exit(1);
+ }
+}
+
+/* Test illegal group with different modes or flags */
+static void test_control_group(void)
+{
+ int fds[2];
+
+ fprintf(stderr, "test: control multiple sockets\n");
+
+ fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
+ if (fds[0] == -1) {
+ fprintf(stderr, "ERROR: failed to open HASH socket\n");
+ exit(1);
+ }
+ if (sock_fanout_open(PACKET_FANOUT_HASH |
+ PACKET_FANOUT_FLAG_DEFRAG, 0) != -1) {
+ fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
+ exit(1);
+ }
+ if (sock_fanout_open(PACKET_FANOUT_HASH |
+ PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
+ fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
+ exit(1);
+ }
+ if (sock_fanout_open(PACKET_FANOUT_CPU, 0) != -1) {
+ fprintf(stderr, "ERROR: joined group with wrong mode\n");
+ exit(1);
+ }
+ fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
+ if (fds[1] == -1) {
+ fprintf(stderr, "ERROR: failed to join group\n");
+ exit(1);
+ }
+ if (close(fds[1]) || close(fds[0])) {
+ fprintf(stderr, "ERROR: closing sockets\n");
+ exit(1);
+ }
+}
+
+/* Test illegal max_num_members values */
+static void test_control_group_max_num_members(void)
+{
+ int fds[3];
+
+ fprintf(stderr, "test: control multiple sockets, max_num_members\n");
+
+ /* expected failure on greater than PACKET_FANOUT_MAX */
+ cfg_max_num_members = (1 << 16) + 1;
+ if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {
+ fprintf(stderr, "ERROR: max_num_members > PACKET_FANOUT_MAX\n");
+ exit(1);
+ }
+
+ cfg_max_num_members = 256;
+ fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
+ if (fds[0] == -1) {
+ fprintf(stderr, "ERROR: failed open\n");
+ exit(1);
+ }
+
+ /* expected failure on joining group with different max_num_members */
+ cfg_max_num_members = 257;
+ if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) {
+ fprintf(stderr, "ERROR: set different max_num_members\n");
+ exit(1);
+ }
+
+ /* success on joining group with same max_num_members */
+ cfg_max_num_members = 256;
+ fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
+ if (fds[1] == -1) {
+ fprintf(stderr, "ERROR: failed to join group\n");
+ exit(1);
+ }
+
+ /* success on joining group with max_num_members unspecified */
+ cfg_max_num_members = 0;
+ fds[2] = sock_fanout_open(PACKET_FANOUT_HASH, 0);
+ if (fds[2] == -1) {
+ fprintf(stderr, "ERROR: failed to join group\n");
+ exit(1);
+ }
+
+ if (close(fds[2]) || close(fds[1]) || close(fds[0])) {
+ fprintf(stderr, "ERROR: closing sockets\n");
+ exit(1);
+ }
+}
+
+/* Test creating a unique fanout group ids */
+static void test_unique_fanout_group_ids(void)
+{
+ int fds[3];
+ uint16_t typeflags, first_group_id, second_group_id;
+
+ fprintf(stderr, "test: unique ids\n");
+
+ fds[0] = sock_fanout_open(PACKET_FANOUT_HASH |
+ PACKET_FANOUT_FLAG_UNIQUEID, 0);
+ if (fds[0] == -1) {
+ fprintf(stderr, "ERROR: failed to create a unique id group.\n");
+ exit(1);
+ }
+
+ sock_fanout_getopts(fds[0], &typeflags, &first_group_id);
+ if (typeflags != PACKET_FANOUT_HASH) {
+ fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags);
+ exit(1);
+ }
+
+ if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {
+ fprintf(stderr, "ERROR: joined group with wrong type.\n");
+ exit(1);
+ }
+
+ fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id);
+ if (fds[1] == -1) {
+ fprintf(stderr,
+ "ERROR: failed to join previously created group.\n");
+ exit(1);
+ }
+
+ fds[2] = sock_fanout_open(PACKET_FANOUT_HASH |
+ PACKET_FANOUT_FLAG_UNIQUEID, 0);
+ if (fds[2] == -1) {
+ fprintf(stderr,
+ "ERROR: failed to create a second unique id group.\n");
+ exit(1);
+ }
+
+ sock_fanout_getopts(fds[2], &typeflags, &second_group_id);
+ if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID,
+ second_group_id) != -1) {
+ fprintf(stderr,
+ "ERROR: specified a group id when requesting unique id\n");
+ exit(1);
+ }
+
+ if (close(fds[0]) || close(fds[1]) || close(fds[2])) {
+ fprintf(stderr, "ERROR: closing sockets\n");
+ exit(1);
+ }
+}
+
+static int test_datapath(uint16_t typeflags, int port_off,
+ const int expect1[], const int expect2[])
+{
+ const int expect0[] = { 0, 0 };
+ char *rings[2];
+ uint8_t type = typeflags & 0xFF;
+ int fds[2], fds_udp[2][2], ret;
+
+ fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n",
+ typeflags, (uint16_t)PORT_BASE,
+ (uint16_t)(PORT_BASE + port_off));
+
+ fds[0] = sock_fanout_open(typeflags, 0);
+ fds[1] = sock_fanout_open(typeflags, 0);
+ 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_control_group_max_num_members();
+ test_unique_fanout_group_ids();
+
+ /* PACKET_FANOUT_MAX */
+ cfg_max_num_members = 1 << 16;
+ /* 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;
+}
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