4 files changed, 361 insertions, 0 deletions

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7c6280f1cf4d..7f50078d0e8c 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -6,6 +6,7 @@ TARGETS += cpu-hotplug
 TARGETS += memory-hotplug
 TARGETS += efivarfs
 TARGETS += net-socket
+TARGETS += net-afpacket
 
 all:
         for TARGET in $(TARGETS); do \
diff --git a/tools/testing/selftests/net-afpacket/Makefile b/tools/testing/selftests/net-afpacket/Makefile
new file mode 100644
index 000000000000..45f2ffb7fda7
--- /dev/null
+++ b/tools/testing/selftests/net-afpacket/Makefile
@@ -0,0 +1,18 @@
+# Makefile for net-socket selftests
+
+CC = $(CROSS_COMPILE)gcc
+CFLAGS = -Wall
+
+CFLAGS += -I../../../../usr/include/
+
+AF_PACKET_PROGS = psock_fanout
+
+all: $(AF_PACKET_PROGS)
+%: %.c
+        $(CC) $(CFLAGS) -o $@ $^
+
+run_tests: all
+        @/bin/sh ./run_afpackettests || echo "afpackettests: [FAIL]"
+
+clean:
+        $(RM) $(AF_PACKET_PROGS)
diff --git a/tools/testing/selftests/net-afpacket/psock_fanout.c b/tools/testing/selftests/net-afpacket/psock_fanout.c
new file mode 100644
index 000000000000..09dbf93c53d4
--- /dev/null
+++ b/tools/testing/selftests/net-afpacket/psock_fanout.c
@@ -0,0 +1,326 @@
+/*
+ * 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_ROLLOVER
+ *
+ * Todo:
+ * - datapath: PACKET_FANOUT_LB
+ * - datapath: PACKET_FANOUT_CPU
+ * - functionality: PACKET_FANOUT_FLAG_DEFRAG
+ *
+ * License (GPLv2):
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/filter.h>
+#include <linux/if_packet.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* Hack: build even if local includes are old */
+#ifndef PACKET_FANOUT
+#define PACKET_FANOUT                   18
+#define PACKET_FANOUT_HASH              0
+#define PACKET_FANOUT_LB                1
+#define PACKET_FANOUT_CPU               2
+#define PACKET_FANOUT_FLAG_DEFRAG       0x8000
+
+#ifndef PACKET_FANOUT_ROLLOVER
+#define PACKET_FANOUT_ROLLOVER          3
+#endif
+
+#ifndef PACKET_FANOUT_FLAG_ROLLOVER
+#define PACKET_FANOUT_FLAG_ROLLOVER     0x1000
+#endif
+
+#endif
+
+#define DATA_LEN                        100
+#define DATA_CHAR                       'a'
+
+static void pair_udp_open(int fds[], uint16_t port)
+{
+        struct sockaddr_in saddr, daddr;
+
+        fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
+        fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
+        if (fds[0] == -1 || fds[1] == -1) {
+                fprintf(stderr, "ERROR: socket dgram\n");
+                exit(1);
+        }
+
+        memset(&saddr, 0, sizeof(saddr));
+        saddr.sin_family = AF_INET;
+        saddr.sin_port = htons(port);
+        saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+        memset(&daddr, 0, sizeof(daddr));
+        daddr.sin_family = AF_INET;
+        daddr.sin_port = htons(port + 1);
+        daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+        /* must bind both to get consistent hash result */
+        if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
+                perror("bind");
+                exit(1);
+        }
+        if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
+                perror("bind");
+                exit(1);
+        }
+        if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
+                perror("bind");
+                exit(1);
+        }
+}
+
+static void pair_udp_send(int fds[], int num)
+{
+        char buf[DATA_LEN], rbuf[DATA_LEN];
+
+        memset(buf, DATA_CHAR, sizeof(buf));
+        while (num--) {
+                /* Should really handle EINTR and EAGAIN */
+                if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
+                        fprintf(stderr, "ERROR: send failed left=%d\n", num);
+                        exit(1);
+                }
+                if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
+                        fprintf(stderr, "ERROR: recv failed left=%d\n", num);
+                        exit(1);
+                }
+                if (memcmp(buf, rbuf, sizeof(buf))) {
+                        fprintf(stderr, "ERROR: data failed left=%d\n", num);
+                        exit(1);
+                }
+        }
+}
+
+static void sock_fanout_setfilter(int fd)
+{
+        struct sock_filter bpf_filter[] = {
+                { 0x80, 0, 0, 0x00000000 },  /* LD  pktlen                    */
+                { 0x35, 0, 5, DATA_LEN   },  /* JGE DATA_LEN  [f goto nomatch]*/
+                { 0x30, 0, 0, 0x00000050 },  /* LD  ip[80]                    */
+                { 0x15, 0, 3, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
+                { 0x30, 0, 0, 0x00000051 },  /* LD  ip[81]                    */
+                { 0x15, 0, 1, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
+                { 0x6, 0, 0, 0x00000060  },  /* RET match                     */
+/* nomatch */   { 0x6, 0, 0, 0x00000000  },  /* RET no match                  */
+        };
+        struct sock_fprog bpf_prog;
+
+        bpf_prog.filter = bpf_filter;
+        bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
+        if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
+                       sizeof(bpf_prog))) {
+                perror("setsockopt SO_ATTACH_FILTER");
+                exit(1);
+        }
+}
+
+/* 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, int num_packets)
+{
+        int fd, val;
+
+        fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
+        if (fd < 0) {
+                perror("socket packet");
+                exit(1);
+        }
+
+        /* fanout group ID is always 0: tests whether old groups are deleted */
+        val = ((int) typeflags) << 16;
+        if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
+                if (close(fd)) {
+                        perror("close packet");
+                        exit(1);
+                }
+                return -1;
+        }
+
+        val = sizeof(struct iphdr) + sizeof(struct udphdr) + DATA_LEN;
+        val *= num_packets;
+        /* hack: apparently, the above calculation is too small (TODO: fix) */
+        val *= 3;
+        if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) {
+                perror("setsockopt SO_RCVBUF");
+                exit(1);
+        }
+
+        sock_fanout_setfilter(fd);
+        return fd;
+}
+
+static void sock_fanout_read(int fds[], const int expect[])
+{
+        struct tpacket_stats stats;
+        socklen_t ssize;
+        int ret[2];
+
+        ssize = sizeof(stats);
+        if (getsockopt(fds[0], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
+                perror("getsockopt statistics 0");
+                exit(1);
+        }
+        ret[0] = stats.tp_packets - stats.tp_drops;
+        ssize = sizeof(stats);
+        if (getsockopt(fds[1], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) {
+                perror("getsockopt statistics 1");
+                exit(1);
+        }
+        ret[1] = stats.tp_packets - stats.tp_drops;
+
+        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, "ERROR: incorrect queue lengths\n");
+                exit(1);
+        }
+}
+
+/* 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, 20);
+        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, 10) != -1) {
+                fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
+                exit(1);
+        }
+        if (sock_fanout_open(PACKET_FANOUT_HASH |
+                               PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
+                fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
+                exit(1);
+        }
+        if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
+                fprintf(stderr, "ERROR: joined group with wrong mode\n");
+                exit(1);
+        }
+        fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
+        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);
+        }
+}
+
+static void test_datapath(uint16_t typeflags,
+                          const int expect1[], const int expect2[])
+{
+        const int expect0[] = { 0, 0 };
+        int fds[2], fds_udp[2][2];
+
+        fprintf(stderr, "test: datapath 0x%hx\n", typeflags);
+
+        fds[0] = sock_fanout_open(typeflags, 20);
+        fds[1] = sock_fanout_open(typeflags, 20);
+        if (fds[0] == -1 || fds[1] == -1) {
+                fprintf(stderr, "ERROR: failed open\n");
+                exit(1);
+        }
+        pair_udp_open(fds_udp[0], 8000);
+        pair_udp_open(fds_udp[1], 8002);
+        sock_fanout_read(fds, expect0);
+
+        /* Send data, but not enough to overflow a queue */
+        pair_udp_send(fds_udp[0], 15);
+        pair_udp_send(fds_udp[1], 5);
+        sock_fanout_read(fds, expect1);
+
+        /* Send more data, overflow the queue */
+        pair_udp_send(fds_udp[0], 15);
+        /* TODO: ensure consistent order between expect1 and expect2 */
+        sock_fanout_read(fds, expect2);
+
+        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);
+        }
+}
+
+int main(int argc, char **argv)
+{
+        const int expect_hash[2][2]     = { { 15, 5 }, { 5, 0 } };
+        const int expect_hash_rb[2][2]  = { { 15, 5 }, { 5, 10 } };
+        const int expect_rb[2][2]       = { { 20, 0 }, { 0, 15 } };
+
+        test_control_single();
+        test_control_group();
+
+        test_datapath(PACKET_FANOUT_HASH, expect_hash[0], expect_hash[1]);
+        test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
+                      expect_hash_rb[0], expect_hash_rb[1]);
+        test_datapath(PACKET_FANOUT_ROLLOVER, expect_rb[0], expect_rb[1]);
+
+        printf("OK. All tests passed\n");
+        return 0;
+}
diff --git a/tools/testing/selftests/net-afpacket/run_afpackettests b/tools/testing/selftests/net-afpacket/run_afpackettests
new file mode 100644
index 000000000000..7907824c6355
--- /dev/null
+++ b/tools/testing/selftests/net-afpacket/run_afpackettests
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if [ $(id -u) != 0 ]; then
+        echo $msg must be run as root >&2
+        exit 0
+fi
+
+echo "--------------------"
+echo "running psock_fanout test"
+echo "--------------------"
+./psock_fanout
+if [ $? -ne 0 ]; then
+        echo "[FAIL]"
+else
+        echo "[PASS]"
+fi