1 files changed, 824 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/psock_tpacket.c b/tools/testing/selftests/net/psock_tpacket.c
new file mode 100644
index 000000000000..c41b58640a05
--- /dev/null
+++ b/tools/testing/selftests/net/psock_tpacket.c
@@ -0,0 +1,824 @@
+/*
+ * Copyright 2013 Red Hat, Inc.
+ * Author: Daniel Borkmann <dborkman@redhat.com>
+ *
+ * A basic test of packet socket's TPACKET_V1/TPACKET_V2/TPACKET_V3 behavior.
+ *
+ * Control:
+ *   Test the setup of the TPACKET socket with different patterns that are
+ *   known to fail (TODO) resp. succeed (OK).
+ *
+ * Datapath:
+ *   Open a pair of packet sockets and send resp. receive an a priori known
+ *   packet pattern accross the sockets and check if it was received resp.
+ *   sent correctly. Fanout in combination with RX_RING is currently not
+ *   tested here.
+ *
+ *   The test currently runs for
+ *   - TPACKET_V1: RX_RING, TX_RING
+ *   - TPACKET_V2: RX_RING, TX_RING
+ *   - TPACKET_V3: RX_RING
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <linux/if_packet.h>
+#include <linux/filter.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <bits/wordsize.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include <net/if.h>
+#include <inttypes.h>
+#include <poll.h>
+
+#include "psock_lib.h"
+
+#ifndef bug_on
+# define bug_on(cond)           assert(!(cond))
+#endif
+
+#ifndef __aligned_tpacket
+# define __aligned_tpacket      __attribute__((aligned(TPACKET_ALIGNMENT)))
+#endif
+
+#ifndef __align_tpacket
+# define __align_tpacket(x)     __attribute__((aligned(TPACKET_ALIGN(x))))
+#endif
+
+#define BLOCK_STATUS(x)         ((x)->h1.block_status)
+#define BLOCK_NUM_PKTS(x)       ((x)->h1.num_pkts)
+#define BLOCK_O2FP(x)           ((x)->h1.offset_to_first_pkt)
+#define BLOCK_LEN(x)            ((x)->h1.blk_len)
+#define BLOCK_SNUM(x)           ((x)->h1.seq_num)
+#define BLOCK_O2PRIV(x)         ((x)->offset_to_priv)
+#define BLOCK_PRIV(x)           ((void *) ((uint8_t *) (x) + BLOCK_O2PRIV(x)))
+#define BLOCK_HDR_LEN           (ALIGN_8(sizeof(struct block_desc)))
+#define ALIGN_8(x)              (((x) + 8 - 1) & ~(8 - 1))
+#define BLOCK_PLUS_PRIV(sz_pri) (BLOCK_HDR_LEN + ALIGN_8((sz_pri)))
+
+#define NUM_PACKETS             100
+
+struct ring {
+        struct iovec *rd;
+        uint8_t *mm_space;
+        size_t mm_len, rd_len;
+        struct sockaddr_ll ll;
+        void (*walk)(int sock, struct ring *ring);
+        int type, rd_num, flen, version;
+        union {
+                struct tpacket_req  req;
+                struct tpacket_req3 req3;
+        };
+};
+
+struct block_desc {
+        uint32_t version;
+        uint32_t offset_to_priv;
+        struct tpacket_hdr_v1 h1;
+};
+
+union frame_map {
+        struct {
+                struct tpacket_hdr tp_h __aligned_tpacket;
+                struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket_hdr));
+        } *v1;
+        struct {
+                struct tpacket2_hdr tp_h __aligned_tpacket;
+                struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket2_hdr));
+        } *v2;
+        void *raw;
+};
+
+static unsigned int total_packets, total_bytes;
+
+static int pfsocket(int ver)
+{
+        int ret, sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+        if (sock == -1) {
+                perror("socket");
+                exit(1);
+        }
+
+        ret = setsockopt(sock, SOL_PACKET, PACKET_VERSION, &ver, sizeof(ver));
+        if (ret == -1) {
+                perror("setsockopt");
+                exit(1);
+        }
+
+        return sock;
+}
+
+static void status_bar_update(void)
+{
+        if (total_packets % 10 == 0) {
+                fprintf(stderr, ".");
+                fflush(stderr);
+        }
+}
+
+static void test_payload(void *pay, size_t len)
+{
+        struct ethhdr *eth = pay;
+
+        if (len < sizeof(struct ethhdr)) {
+                fprintf(stderr, "test_payload: packet too "
+                        "small: %zu bytes!\n", len);
+                exit(1);
+        }
+
+        if (eth->h_proto != htons(ETH_P_IP)) {
+                fprintf(stderr, "test_payload: wrong ethernet "
+                        "type: 0x%x!\n", ntohs(eth->h_proto));
+                exit(1);
+        }
+}
+
+static void create_payload(void *pay, size_t *len)
+{
+        int i;
+        struct ethhdr *eth = pay;
+        struct iphdr *ip = pay + sizeof(*eth);
+
+        /* Lets create some broken crap, that still passes
+         * our BPF filter.
+         */
+
+        *len = DATA_LEN + 42;
+
+        memset(pay, 0xff, ETH_ALEN * 2);
+        eth->h_proto = htons(ETH_P_IP);
+
+        for (i = 0; i < sizeof(*ip); ++i)
+                ((uint8_t *) pay)[i + sizeof(*eth)] = (uint8_t) rand();
+
+        ip->ihl = 5;
+        ip->version = 4;
+        ip->protocol = 0x11;
+        ip->frag_off = 0;
+        ip->ttl = 64;
+        ip->tot_len = htons((uint16_t) *len - sizeof(*eth));
+
+        ip->saddr = htonl(INADDR_LOOPBACK);
+        ip->daddr = htonl(INADDR_LOOPBACK);
+
+        memset(pay + sizeof(*eth) + sizeof(*ip),
+               DATA_CHAR, DATA_LEN);
+}
+
+static inline int __v1_rx_kernel_ready(struct tpacket_hdr *hdr)
+{
+        return ((hdr->tp_status & TP_STATUS_USER) == TP_STATUS_USER);
+}
+
+static inline void __v1_rx_user_ready(struct tpacket_hdr *hdr)
+{
+        hdr->tp_status = TP_STATUS_KERNEL;
+        __sync_synchronize();
+}
+
+static inline int __v2_rx_kernel_ready(struct tpacket2_hdr *hdr)
+{
+        return ((hdr->tp_status & TP_STATUS_USER) == TP_STATUS_USER);
+}
+
+static inline void __v2_rx_user_ready(struct tpacket2_hdr *hdr)
+{
+        hdr->tp_status = TP_STATUS_KERNEL;
+        __sync_synchronize();
+}
+
+static inline int __v1_v2_rx_kernel_ready(void *base, int version)
+{
+        switch (version) {
+        case TPACKET_V1:
+                return __v1_rx_kernel_ready(base);
+        case TPACKET_V2:
+                return __v2_rx_kernel_ready(base);
+        default:
+                bug_on(1);
+                return 0;
+        }
+}
+
+static inline void __v1_v2_rx_user_ready(void *base, int version)
+{
+        switch (version) {
+        case TPACKET_V1:
+                __v1_rx_user_ready(base);
+                break;
+        case TPACKET_V2:
+                __v2_rx_user_ready(base);
+                break;
+        }
+}
+
+static void walk_v1_v2_rx(int sock, struct ring *ring)
+{
+        struct pollfd pfd;
+        int udp_sock[2];
+        union frame_map ppd;
+        unsigned int frame_num = 0;
+
+        bug_on(ring->type != PACKET_RX_RING);
+
+        pair_udp_open(udp_sock, PORT_BASE);
+        pair_udp_setfilter(sock);
+
+        memset(&pfd, 0, sizeof(pfd));
+        pfd.fd = sock;
+        pfd.events = POLLIN | POLLERR;
+        pfd.revents = 0;
+
+        pair_udp_send(udp_sock, NUM_PACKETS);
+
+        while (total_packets < NUM_PACKETS * 2) {
+                while (__v1_v2_rx_kernel_ready(ring->rd[frame_num].iov_base,
+                                               ring->version)) {
+                        ppd.raw = ring->rd[frame_num].iov_base;
+
+                        switch (ring->version) {
+                        case TPACKET_V1:
+                                test_payload((uint8_t *) ppd.raw + ppd.v1->tp_h.tp_mac,
+                                             ppd.v1->tp_h.tp_snaplen);
+                                total_bytes += ppd.v1->tp_h.tp_snaplen;
+                                break;
+
+                        case TPACKET_V2:
+                                test_payload((uint8_t *) ppd.raw + ppd.v2->tp_h.tp_mac,
+                                             ppd.v2->tp_h.tp_snaplen);
+                                total_bytes += ppd.v2->tp_h.tp_snaplen;
+                                break;
+                        }
+
+                        status_bar_update();
+                        total_packets++;
+
+                        __v1_v2_rx_user_ready(ppd.raw, ring->version);
+
+                        frame_num = (frame_num + 1) % ring->rd_num;
+                }
+
+                poll(&pfd, 1, 1);
+        }
+
+        pair_udp_close(udp_sock);
+
+        if (total_packets != 2 * NUM_PACKETS) {
+                fprintf(stderr, "walk_v%d_rx: received %u out of %u pkts\n",
+                        ring->version, total_packets, NUM_PACKETS);
+                exit(1);
+        }
+
+        fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, total_bytes >> 1);
+}
+
+static inline int __v1_tx_kernel_ready(struct tpacket_hdr *hdr)
+{
+        return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
+}
+
+static inline void __v1_tx_user_ready(struct tpacket_hdr *hdr)
+{
+        hdr->tp_status = TP_STATUS_SEND_REQUEST;
+        __sync_synchronize();
+}
+
+static inline int __v2_tx_kernel_ready(struct tpacket2_hdr *hdr)
+{
+        return !(hdr->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING));
+}
+
+static inline void __v2_tx_user_ready(struct tpacket2_hdr *hdr)
+{
+        hdr->tp_status = TP_STATUS_SEND_REQUEST;
+        __sync_synchronize();
+}
+
+static inline int __v1_v2_tx_kernel_ready(void *base, int version)
+{
+        switch (version) {
+        case TPACKET_V1:
+                return __v1_tx_kernel_ready(base);
+        case TPACKET_V2:
+                return __v2_tx_kernel_ready(base);
+        default:
+                bug_on(1);
+                return 0;
+        }
+}
+
+static inline void __v1_v2_tx_user_ready(void *base, int version)
+{
+        switch (version) {
+        case TPACKET_V1:
+                __v1_tx_user_ready(base);
+                break;
+        case TPACKET_V2:
+                __v2_tx_user_ready(base);
+                break;
+        }
+}
+
+static void __v1_v2_set_packet_loss_discard(int sock)
+{
+        int ret, discard = 1;
+
+        ret = setsockopt(sock, SOL_PACKET, PACKET_LOSS, (void *) &discard,
+                         sizeof(discard));
+        if (ret == -1) {
+                perror("setsockopt");
+                exit(1);
+        }
+}
+
+static void walk_v1_v2_tx(int sock, struct ring *ring)
+{
+        struct pollfd pfd;
+        int rcv_sock, ret;
+        size_t packet_len;
+        union frame_map ppd;
+        char packet[1024];
+        unsigned int frame_num = 0, got = 0;
+        struct sockaddr_ll ll = {
+                .sll_family = PF_PACKET,
+                .sll_halen = ETH_ALEN,
+        };
+
+        bug_on(ring->type != PACKET_TX_RING);
+        bug_on(ring->rd_num < NUM_PACKETS);
+
+        rcv_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+        if (rcv_sock == -1) {
+                perror("socket");
+                exit(1);
+        }
+
+        pair_udp_setfilter(rcv_sock);
+
+        ll.sll_ifindex = if_nametoindex("lo");
+        ret = bind(rcv_sock, (struct sockaddr *) &ll, sizeof(ll));
+        if (ret == -1) {
+                perror("bind");
+                exit(1);
+        }
+
+        memset(&pfd, 0, sizeof(pfd));
+        pfd.fd = sock;
+        pfd.events = POLLOUT | POLLERR;
+        pfd.revents = 0;
+
+        total_packets = NUM_PACKETS;
+        create_payload(packet, &packet_len);
+
+        while (total_packets > 0) {
+                while (__v1_v2_tx_kernel_ready(ring->rd[frame_num].iov_base,
+                                               ring->version) &&
+                       total_packets > 0) {
+                        ppd.raw = ring->rd[frame_num].iov_base;
+
+                        switch (ring->version) {
+                        case TPACKET_V1:
+                                ppd.v1->tp_h.tp_snaplen = packet_len;
+                                ppd.v1->tp_h.tp_len = packet_len;
+
+                                memcpy((uint8_t *) ppd.raw + TPACKET_HDRLEN -
+                                       sizeof(struct sockaddr_ll), packet,
+                                       packet_len);
+                                total_bytes += ppd.v1->tp_h.tp_snaplen;
+                                break;
+
+                        case TPACKET_V2:
+                                ppd.v2->tp_h.tp_snaplen = packet_len;
+                                ppd.v2->tp_h.tp_len = packet_len;
+
+                                memcpy((uint8_t *) ppd.raw + TPACKET2_HDRLEN -
+                                       sizeof(struct sockaddr_ll), packet,
+                                       packet_len);
+                                total_bytes += ppd.v2->tp_h.tp_snaplen;
+                                break;
+                        }
+
+                        status_bar_update();
+                        total_packets--;
+
+                        __v1_v2_tx_user_ready(ppd.raw, ring->version);
+
+                        frame_num = (frame_num + 1) % ring->rd_num;
+                }
+
+                poll(&pfd, 1, 1);
+        }
+
+        bug_on(total_packets != 0);
+
+        ret = sendto(sock, NULL, 0, 0, NULL, 0);
+        if (ret == -1) {
+                perror("sendto");
+                exit(1);
+        }
+
+        while ((ret = recvfrom(rcv_sock, packet, sizeof(packet),
+                               0, NULL, NULL)) > 0 &&
+               total_packets < NUM_PACKETS) {
+                got += ret;
+                test_payload(packet, ret);
+
+                status_bar_update();
+                total_packets++;
+        }
+
+        close(rcv_sock);
+
+        if (total_packets != NUM_PACKETS) {
+                fprintf(stderr, "walk_v%d_rx: received %u out of %u pkts\n",
+                        ring->version, total_packets, NUM_PACKETS);
+                exit(1);
+        }
+
+        fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, got);
+}
+
+static void walk_v1_v2(int sock, struct ring *ring)
+{
+        if (ring->type == PACKET_RX_RING)
+                walk_v1_v2_rx(sock, ring);
+        else
+                walk_v1_v2_tx(sock, ring);
+}
+
+static uint64_t __v3_prev_block_seq_num = 0;
+
+void __v3_test_block_seq_num(struct block_desc *pbd)
+{
+        if (__v3_prev_block_seq_num + 1 != BLOCK_SNUM(pbd)) {
+                fprintf(stderr, "\nprev_block_seq_num:%"PRIu64", expected "
+                        "seq:%"PRIu64" != actual seq:%"PRIu64"\n",
+                        __v3_prev_block_seq_num, __v3_prev_block_seq_num + 1,
+                        (uint64_t) BLOCK_SNUM(pbd));
+                exit(1);
+        }
+
+        __v3_prev_block_seq_num = BLOCK_SNUM(pbd);
+}
+
+static void __v3_test_block_len(struct block_desc *pbd, uint32_t bytes, int block_num)
+{
+        if (BLOCK_NUM_PKTS(pbd)) {
+                if (bytes != BLOCK_LEN(pbd)) {
+                        fprintf(stderr, "\nblock:%u with %upackets, expected "
+                                "len:%u != actual len:%u\n", block_num,
+                                BLOCK_NUM_PKTS(pbd), bytes, BLOCK_LEN(pbd));
+                        exit(1);
+                }
+        } else {
+                if (BLOCK_LEN(pbd) != BLOCK_PLUS_PRIV(13)) {
+                        fprintf(stderr, "\nblock:%u, expected len:%lu != "
+                                "actual len:%u\n", block_num, BLOCK_HDR_LEN,
+                                BLOCK_LEN(pbd));
+                        exit(1);
+                }
+        }
+}
+
+static void __v3_test_block_header(struct block_desc *pbd, const int block_num)
+{
+        uint32_t block_status = BLOCK_STATUS(pbd);
+
+        if ((block_status & TP_STATUS_USER) == 0) {
+                fprintf(stderr, "\nblock %u: not in TP_STATUS_USER\n", block_num);
+                exit(1);
+        }
+
+        __v3_test_block_seq_num(pbd);
+}
+
+static void __v3_walk_block(struct block_desc *pbd, const int block_num)
+{
+        int num_pkts = BLOCK_NUM_PKTS(pbd), i;
+        unsigned long bytes = 0;
+        unsigned long bytes_with_padding = BLOCK_PLUS_PRIV(13);
+        struct tpacket3_hdr *ppd;
+
+        __v3_test_block_header(pbd, block_num);
+
+        ppd = (struct tpacket3_hdr *) ((uint8_t *) pbd + BLOCK_O2FP(pbd));
+        for (i = 0; i < num_pkts; ++i) {
+                bytes += ppd->tp_snaplen;
+
+                if (ppd->tp_next_offset)
+                        bytes_with_padding += ppd->tp_next_offset;
+                else
+                        bytes_with_padding += ALIGN_8(ppd->tp_snaplen + ppd->tp_mac);
+
+                test_payload((uint8_t *) ppd + ppd->tp_mac, ppd->tp_snaplen);
+
+                status_bar_update();
+                total_packets++;
+
+                ppd = (struct tpacket3_hdr *) ((uint8_t *) ppd + ppd->tp_next_offset);
+                __sync_synchronize();
+        }
+
+        __v3_test_block_len(pbd, bytes_with_padding, block_num);
+        total_bytes += bytes;
+}
+
+void __v3_flush_block(struct block_desc *pbd)
+{
+        BLOCK_STATUS(pbd) = TP_STATUS_KERNEL;
+        __sync_synchronize();
+}
+
+static void walk_v3_rx(int sock, struct ring *ring)
+{
+        unsigned int block_num = 0;
+        struct pollfd pfd;
+        struct block_desc *pbd;
+        int udp_sock[2];
+
+        bug_on(ring->type != PACKET_RX_RING);
+
+        pair_udp_open(udp_sock, PORT_BASE);
+        pair_udp_setfilter(sock);
+
+        memset(&pfd, 0, sizeof(pfd));
+        pfd.fd = sock;
+        pfd.events = POLLIN | POLLERR;
+        pfd.revents = 0;
+
+        pair_udp_send(udp_sock, NUM_PACKETS);
+
+        while (total_packets < NUM_PACKETS * 2) {
+                pbd = (struct block_desc *) ring->rd[block_num].iov_base;
+
+                while ((BLOCK_STATUS(pbd) & TP_STATUS_USER) == 0)
+                        poll(&pfd, 1, 1);
+
+                __v3_walk_block(pbd, block_num);
+                __v3_flush_block(pbd);
+
+                block_num = (block_num + 1) % ring->rd_num;
+        }
+
+        pair_udp_close(udp_sock);
+
+        if (total_packets != 2 * NUM_PACKETS) {
+                fprintf(stderr, "walk_v3_rx: received %u out of %u pkts\n",
+                        total_packets, NUM_PACKETS);
+                exit(1);
+        }
+
+        fprintf(stderr, " %u pkts (%u bytes)", NUM_PACKETS, total_bytes >> 1);
+}
+
+static void walk_v3(int sock, struct ring *ring)
+{
+        if (ring->type == PACKET_RX_RING)
+                walk_v3_rx(sock, ring);
+        else
+                bug_on(1);
+}
+
+static void __v1_v2_fill(struct ring *ring, unsigned int blocks)
+{
+        ring->req.tp_block_size = getpagesize() << 2;
+        ring->req.tp_frame_size = TPACKET_ALIGNMENT << 7;
+        ring->req.tp_block_nr = blocks;
+
+        ring->req.tp_frame_nr = ring->req.tp_block_size /
+                                ring->req.tp_frame_size *
+                                ring->req.tp_block_nr;
+
+        ring->mm_len = ring->req.tp_block_size * ring->req.tp_block_nr;
+        ring->walk = walk_v1_v2;
+        ring->rd_num = ring->req.tp_frame_nr;
+        ring->flen = ring->req.tp_frame_size;
+}
+
+static void __v3_fill(struct ring *ring, unsigned int blocks)
+{
+        ring->req3.tp_retire_blk_tov = 64;
+        ring->req3.tp_sizeof_priv = 13;
+        ring->req3.tp_feature_req_word |= TP_FT_REQ_FILL_RXHASH;
+
+        ring->req3.tp_block_size = getpagesize() << 2;
+        ring->req3.tp_frame_size = TPACKET_ALIGNMENT << 7;
+        ring->req3.tp_block_nr = blocks;
+
+        ring->req3.tp_frame_nr = ring->req3.tp_block_size /
+                                 ring->req3.tp_frame_size *
+                                 ring->req3.tp_block_nr;
+
+        ring->mm_len = ring->req3.tp_block_size * ring->req3.tp_block_nr;
+        ring->walk = walk_v3;
+        ring->rd_num = ring->req3.tp_block_nr;
+        ring->flen = ring->req3.tp_block_size;
+}
+
+static void setup_ring(int sock, struct ring *ring, int version, int type)
+{
+        int ret = 0;
+        unsigned int blocks = 256;
+
+        ring->type = type;
+        ring->version = version;
+
+        switch (version) {
+        case TPACKET_V1:
+        case TPACKET_V2:
+                if (type == PACKET_TX_RING)
+                        __v1_v2_set_packet_loss_discard(sock);
+                __v1_v2_fill(ring, blocks);
+                ret = setsockopt(sock, SOL_PACKET, type, &ring->req,
+                                 sizeof(ring->req));
+                break;
+
+        case TPACKET_V3:
+                __v3_fill(ring, blocks);
+                ret = setsockopt(sock, SOL_PACKET, type, &ring->req3,
+                                 sizeof(ring->req3));
+                break;
+        }
+
+        if (ret == -1) {
+                perror("setsockopt");
+                exit(1);
+        }
+
+        ring->rd_len = ring->rd_num * sizeof(*ring->rd);
+        ring->rd = malloc(ring->rd_len);
+        if (ring->rd == NULL) {
+                perror("malloc");
+                exit(1);
+        }
+
+        total_packets = 0;
+        total_bytes = 0;
+}
+
+static void mmap_ring(int sock, struct ring *ring)
+{
+        int i;
+
+        ring->mm_space = mmap(0, ring->mm_len, PROT_READ | PROT_WRITE,
+                              MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
+        if (ring->mm_space == MAP_FAILED) {
+                perror("mmap");
+                exit(1);
+        }
+
+        memset(ring->rd, 0, ring->rd_len);
+        for (i = 0; i < ring->rd_num; ++i) {
+                ring->rd[i].iov_base = ring->mm_space + (i * ring->flen);
+                ring->rd[i].iov_len = ring->flen;
+        }
+}
+
+static void bind_ring(int sock, struct ring *ring)
+{
+        int ret;
+
+        ring->ll.sll_family = PF_PACKET;
+        ring->ll.sll_protocol = htons(ETH_P_ALL);
+        ring->ll.sll_ifindex = if_nametoindex("lo");
+        ring->ll.sll_hatype = 0;
+        ring->ll.sll_pkttype = 0;
+        ring->ll.sll_halen = 0;
+
+        ret = bind(sock, (struct sockaddr *) &ring->ll, sizeof(ring->ll));
+        if (ret == -1) {
+                perror("bind");
+                exit(1);
+        }
+}
+
+static void walk_ring(int sock, struct ring *ring)
+{
+        ring->walk(sock, ring);
+}
+
+static void unmap_ring(int sock, struct ring *ring)
+{
+        munmap(ring->mm_space, ring->mm_len);
+        free(ring->rd);
+}
+
+static int test_kernel_bit_width(void)
+{
+        char in[512], *ptr;
+        int num = 0, fd;
+        ssize_t ret;
+
+        fd = open("/proc/kallsyms", O_RDONLY);
+        if (fd == -1) {
+                perror("open");
+                exit(1);
+        }
+
+        ret = read(fd, in, sizeof(in));
+        if (ret <= 0) {
+                perror("read");
+                exit(1);
+        }
+
+        close(fd);
+
+        ptr = in;
+        while(!isspace(*ptr)) {
+                num++;
+                ptr++;
+        }
+
+        return num * 4;
+}
+
+static int test_user_bit_width(void)
+{
+        return __WORDSIZE;
+}
+
+static const char *tpacket_str[] = {
+        [TPACKET_V1] = "TPACKET_V1",
+        [TPACKET_V2] = "TPACKET_V2",
+        [TPACKET_V3] = "TPACKET_V3",
+};
+
+static const char *type_str[] = {
+        [PACKET_RX_RING] = "PACKET_RX_RING",
+        [PACKET_TX_RING] = "PACKET_TX_RING",
+};
+
+static int test_tpacket(int version, int type)
+{
+        int sock;
+        struct ring ring;
+
+        fprintf(stderr, "test: %s with %s ", tpacket_str[version],
+                type_str[type]);
+        fflush(stderr);
+
+        if (version == TPACKET_V1 &&
+            test_kernel_bit_width() != test_user_bit_width()) {
+                fprintf(stderr, "test: skip %s %s since user and kernel "
+                        "space have different bit width\n",
+                        tpacket_str[version], type_str[type]);
+                return 0;
+        }
+
+        sock = pfsocket(version);
+        memset(&ring, 0, sizeof(ring));
+        setup_ring(sock, &ring, version, type);
+        mmap_ring(sock, &ring);
+        bind_ring(sock, &ring);
+        walk_ring(sock, &ring);
+        unmap_ring(sock, &ring);
+        close(sock);
+
+        fprintf(stderr, "\n");
+        return 0;
+}
+
+int main(void)
+{
+        int ret = 0;
+
+        ret |= test_tpacket(TPACKET_V1, PACKET_RX_RING);
+        ret |= test_tpacket(TPACKET_V1, PACKET_TX_RING);
+
+        ret |= test_tpacket(TPACKET_V2, PACKET_RX_RING);
+        ret |= test_tpacket(TPACKET_V2, PACKET_TX_RING);
+
+        ret |= test_tpacket(TPACKET_V3, PACKET_RX_RING);
+
+        if (ret)
+                return 1;
+
+        printf("OK. All tests passed\n");
+        return 0;
+}