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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_ROLLOVER
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+ *
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+ * Todo:
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+ * - datapath: PACKET_FANOUT_LB
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+ * - datapath: PACKET_FANOUT_CPU
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+ * - functionality: PACKET_FANOUT_FLAG_DEFRAG
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+ *
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+ * License (GPLv2):
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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+ */
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+
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+#include <arpa/inet.h>
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+#include <errno.h>
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+#include <linux/filter.h>
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+#include <linux/if_packet.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 <fcntl.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/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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+
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+/* Hack: build even if local includes are old */
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+#ifndef PACKET_FANOUT
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+#define PACKET_FANOUT 18
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+#define PACKET_FANOUT_HASH 0
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+#define PACKET_FANOUT_LB 1
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+#define PACKET_FANOUT_CPU 2
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+#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
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+
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+#ifndef PACKET_FANOUT_ROLLOVER
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+#define PACKET_FANOUT_ROLLOVER 3
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+#endif
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+
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+#ifndef PACKET_FANOUT_FLAG_ROLLOVER
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+#define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
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+#endif
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+
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+#endif
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+
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+#define DATA_LEN 100
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+#define DATA_CHAR 'a'
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+
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+static void pair_udp_open(int fds[], uint16_t port)
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+{
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+ struct sockaddr_in saddr, daddr;
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+
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+ fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
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+ fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
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+ if (fds[0] == -1 || fds[1] == -1) {
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+ fprintf(stderr, "ERROR: socket dgram\n");
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+ exit(1);
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+ }
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+
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+ memset(&saddr, 0, sizeof(saddr));
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+ saddr.sin_family = AF_INET;
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+ saddr.sin_port = htons(port);
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+ saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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+
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+ memset(&daddr, 0, sizeof(daddr));
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+ daddr.sin_family = AF_INET;
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+ daddr.sin_port = htons(port + 1);
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+ daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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+
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+ /* must bind both to get consistent hash result */
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+ if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
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+ perror("bind");
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+ exit(1);
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+ }
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+ if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
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+ perror("bind");
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+ exit(1);
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+ }
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+ if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
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+ perror("bind");
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+ exit(1);
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+ }
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+}
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+
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+static void pair_udp_send(int fds[], int num)
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+{
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+ char buf[DATA_LEN], rbuf[DATA_LEN];
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+
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+ memset(buf, DATA_CHAR, sizeof(buf));
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+ while (num--) {
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+ /* Should really handle EINTR and EAGAIN */
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+ if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
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+ fprintf(stderr, "ERROR: send failed left=%d\n", num);
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+ exit(1);
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+ }
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+ if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
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+ fprintf(stderr, "ERROR: recv failed left=%d\n", num);
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+ exit(1);
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+ }
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+ if (memcmp(buf, rbuf, sizeof(buf))) {
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+ fprintf(stderr, "ERROR: data failed left=%d\n", num);
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+ exit(1);
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+ }
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+ }
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+}
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+
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+static void sock_fanout_setfilter(int fd)
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+{
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+ struct sock_filter bpf_filter[] = {
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+ { 0x80, 0, 0, 0x00000000 }, /* LD pktlen */
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+ { 0x35, 0, 5, DATA_LEN }, /* JGE DATA_LEN [f goto nomatch]*/
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+ { 0x30, 0, 0, 0x00000050 }, /* LD ip[80] */
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+ { 0x15, 0, 3, DATA_CHAR }, /* JEQ DATA_CHAR [f goto nomatch]*/
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+ { 0x30, 0, 0, 0x00000051 }, /* LD ip[81] */
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+ { 0x15, 0, 1, DATA_CHAR }, /* JEQ DATA_CHAR [f goto nomatch]*/
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+ { 0x6, 0, 0, 0x00000060 }, /* RET match */
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+/* nomatch */ { 0x6, 0, 0, 0x00000000 }, /* RET no match */
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+ };
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+ struct sock_fprog bpf_prog;
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+
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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_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
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+ sizeof(bpf_prog))) {
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+ perror("setsockopt SO_ATTACH_FILTER");
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+ exit(1);
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+ }
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+}
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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, int num_packets)
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+{
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+ int fd, val;
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+
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+ fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
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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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+
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+ /* fanout group ID is always 0: tests whether old groups are deleted */
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+ val = ((int) typeflags) << 16;
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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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+
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+ val = sizeof(struct iphdr) + sizeof(struct udphdr) + DATA_LEN;
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+ val *= num_packets;
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+ /* hack: apparently, the above calculation is too small (TODO: fix) */
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+ val *= 3;
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+ if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) {
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+ perror("setsockopt SO_RCVBUF");
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+ exit(1);
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+ }
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+
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+ sock_fanout_setfilter(fd);
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+ return fd;
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+}
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+
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+static void sock_fanout_read(int fds[], const int expect[])
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+{
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+ struct tpacket_stats stats;
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+ socklen_t ssize;
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+ int ret[2];
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+
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+ ssize = sizeof(stats);
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+ if (getsockopt(fds[0], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
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+ perror("getsockopt statistics 0");
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+ exit(1);
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+ }
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+ ret[0] = stats.tp_packets - stats.tp_drops;
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+ ssize = sizeof(stats);
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+ if (getsockopt(fds[1], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
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+ perror("getsockopt statistics 1");
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+ exit(1);
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+ }
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+ ret[1] = stats.tp_packets - stats.tp_drops;
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+
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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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+
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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, "ERROR: incorrect queue lengths\n");
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+ exit(1);
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+ }
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+}
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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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+
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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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+
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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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+
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+ fprintf(stderr, "test: control multiple sockets\n");
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+
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+ fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
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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, 10) != -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, 10) != -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, 10) != -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, 20);
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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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+
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+static void test_datapath(uint16_t typeflags,
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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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+ int fds[2], fds_udp[2][2];
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+
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+ fprintf(stderr, "test: datapath 0x%hx\n", typeflags);
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+
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+ fds[0] = sock_fanout_open(typeflags, 20);
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+ fds[1] = sock_fanout_open(typeflags, 20);
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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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+ pair_udp_open(fds_udp[0], 8000);
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+ pair_udp_open(fds_udp[1], 8002);
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+ sock_fanout_read(fds, expect0);
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+
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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(fds_udp[1], 5);
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+ sock_fanout_read(fds, expect1);
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+
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+ /* Send more data, overflow the queue */
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+ pair_udp_send(fds_udp[0], 15);
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+ /* TODO: ensure consistent order between expect1 and expect2 */
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+ sock_fanout_read(fds, expect2);
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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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+}
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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 }, { 5, 0 } };
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+ const int expect_hash_rb[2][2] = { { 15, 5 }, { 5, 10 } };
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+ const int expect_rb[2][2] = { { 20, 0 }, { 0, 15 } };
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+
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+ test_control_single();
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+ test_control_group();
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+
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+ test_datapath(PACKET_FANOUT_HASH, expect_hash[0], expect_hash[1]);
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+ test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
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+ expect_hash_rb[0], expect_hash_rb[1]);
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+ test_datapath(PACKET_FANOUT_ROLLOVER, expect_rb[0], expect_rb[1]);
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+
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+ printf("OK. All tests passed\n");
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+ return 0;
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+}
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Willem de Bruijn