mirror of
https://github.com/vanhoefm/fragattacks.git
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24dbd2813c
This makes it easier to test how Data frames are mapped to different ACs. Signed-hostap: Jouni Malinen <j@w1.fi>
307 lines
6.9 KiB
C
307 lines
6.9 KiB
C
/*
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* hwsim_test - Data connectivity test for mac80211_hwsim
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* Copyright (c) 2009, Atheros Communications
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/ip.h>
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#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
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#define MACSTR "%02x:%02x:%02x:%02x:%02x:%02x"
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#define HWSIM_ETHERTYPE ETHERTYPE_IP
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#define HWSIM_PACKETLEN 1500
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static unsigned char addr1[ETH_ALEN], addr2[ETH_ALEN], bcast[ETH_ALEN];
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static u_int16_t checksum(const void *buf, size_t len)
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{
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size_t i;
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u_int32_t sum = 0;
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const u_int16_t *pos = buf;
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for (i = 0; i < len / 2; i++)
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sum += *pos++;
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while (sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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return sum ^ 0xffff;
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}
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static void tx(int s, const char *ifname, int ifindex,
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const unsigned char *src, const unsigned char *dst,
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u_int8_t tos)
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{
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char buf[HWSIM_PACKETLEN], *pos;
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struct ether_header *eth;
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struct iphdr *ip;
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int i;
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printf("TX: %s(ifindex=%d) " MACSTR " -> " MACSTR "\n",
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ifname, ifindex, MAC2STR(src), MAC2STR(dst));
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eth = (struct ether_header *) buf;
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memcpy(eth->ether_dhost, dst, ETH_ALEN);
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memcpy(eth->ether_shost, src, ETH_ALEN);
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eth->ether_type = htons(HWSIM_ETHERTYPE);
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ip = (struct iphdr *) (eth + 1);
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memset(ip, 0, sizeof(*ip));
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ip->ihl = 5;
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ip->version = 4;
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ip->ttl = 64;
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ip->tos = tos;
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ip->tot_len = htons(HWSIM_PACKETLEN - sizeof(*eth));
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ip->protocol = 1;
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ip->saddr = htonl(192 << 24 | 168 << 16 | 1 << 8 | 1);
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ip->daddr = htonl(192 << 24 | 168 << 16 | 1 << 8 | 2);
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ip->check = checksum(ip, sizeof(*ip));
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pos = (char *) (ip + 1);
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for (i = 0; i < sizeof(buf) - sizeof(*eth) - sizeof(*ip); i++)
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*pos++ = i;
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if (send(s, buf, sizeof(buf), 0) < 0)
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perror("send");
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}
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struct rx_result {
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unsigned int rx_unicast1:1;
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unsigned int rx_broadcast1:1;
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unsigned int rx_unicast2:1;
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unsigned int rx_broadcast2:1;
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};
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static void rx(int s, int iface, const char *ifname, int ifindex,
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struct rx_result *res)
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{
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char buf[HWSIM_PACKETLEN + 1], *pos;
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struct ether_header *eth;
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struct iphdr *ip;
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int len, i;
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len = recv(s, buf, sizeof(buf), 0);
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if (len < 0) {
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perror("recv");
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return;
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}
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eth = (struct ether_header *) buf;
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printf("RX: %s(ifindex=%d) " MACSTR " -> " MACSTR " (len=%d)\n",
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ifname, ifindex,
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MAC2STR(eth->ether_shost), MAC2STR(eth->ether_dhost), len);
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if (len != HWSIM_PACKETLEN) {
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printf("Ignore frame with unexpected RX length (%d)\n", len);
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return;
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}
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ip = (struct iphdr *) (eth + 1);
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pos = (char *) (ip + 1);
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for (i = 0; i < sizeof(buf) - 1 - sizeof(*eth) - sizeof(*ip); i++) {
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if ((unsigned char) *pos != (unsigned char) i) {
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printf("Ignore frame with unexpected contents\n");
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printf("i=%d received=0x%x expected=0x%x\n",
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i, (unsigned char) *pos, (unsigned char) i);
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return;
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}
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pos++;
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}
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if (iface == 1 &&
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memcmp(eth->ether_dhost, addr1, ETH_ALEN) == 0 &&
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memcmp(eth->ether_shost, addr2, ETH_ALEN) == 0)
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res->rx_unicast1 = 1;
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else if (iface == 1 &&
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memcmp(eth->ether_dhost, bcast, ETH_ALEN) == 0 &&
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memcmp(eth->ether_shost, addr2, ETH_ALEN) == 0)
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res->rx_broadcast1 = 1;
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else if (iface == 2 &&
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memcmp(eth->ether_dhost, addr2, ETH_ALEN) == 0 &&
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memcmp(eth->ether_shost, addr1, ETH_ALEN) == 0)
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res->rx_unicast2 = 1;
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else if (iface == 2 &&
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memcmp(eth->ether_dhost, bcast, ETH_ALEN) == 0 &&
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memcmp(eth->ether_shost, addr1, ETH_ALEN) == 0)
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res->rx_broadcast2 = 1;
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}
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static void usage(void)
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{
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fprintf(stderr, "usage: hwsim_test [-D<DSCP>] [-t<tos>] <ifname1> <ifname2>\n");
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}
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int main(int argc, char *argv[])
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{
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int s1 = -1, s2 = -1, ret = -1, c;
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struct ifreq ifr;
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int ifindex1, ifindex2;
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struct sockaddr_ll ll;
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fd_set rfds;
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struct timeval tv;
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struct rx_result res;
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char *s_ifname, *d_ifname, *end;
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int tos = 0;
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for (;;) {
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c = getopt(argc, argv, "D:t:");
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if (c < 0)
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break;
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switch (c) {
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case 'D':
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tos = strtol(optarg, &end, 0) << 2;
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if (*end) {
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usage();
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return -1;
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}
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break;
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case 't':
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tos = strtol(optarg, &end, 0);
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if (*end) {
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usage();
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return -1;
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}
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break;
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default:
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usage();
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return -1;
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}
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}
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if (optind != argc - 2) {
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usage();
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return -1;
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}
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s_ifname = argv[optind];
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d_ifname = argv[optind + 1];
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memset(bcast, 0xff, ETH_ALEN);
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s1 = socket(PF_PACKET, SOCK_RAW, htons(HWSIM_ETHERTYPE));
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if (s1 < 0) {
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perror("socket");
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goto fail;
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}
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s2 = socket(PF_PACKET, SOCK_RAW, htons(HWSIM_ETHERTYPE));
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if (s2 < 0) {
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perror("socket");
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goto fail;
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}
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, s_ifname, sizeof(ifr.ifr_name));
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if (ioctl(s1, SIOCGIFINDEX, &ifr) < 0) {
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perror("ioctl[SIOCGIFINDEX]");
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goto fail;
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}
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ifindex1 = ifr.ifr_ifindex;
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if (ioctl(s1, SIOCGIFHWADDR, &ifr) < 0) {
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perror("ioctl[SIOCGIFHWADDR]");
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goto fail;
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}
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memcpy(addr1, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, d_ifname, sizeof(ifr.ifr_name));
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if (ioctl(s2, SIOCGIFINDEX, &ifr) < 0) {
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perror("ioctl[SIOCGIFINDEX]");
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goto fail;
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}
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ifindex2 = ifr.ifr_ifindex;
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if (ioctl(s2, SIOCGIFHWADDR, &ifr) < 0) {
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perror("ioctl[SIOCGIFHWADDR]");
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goto fail;
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}
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memcpy(addr2, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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memset(&ll, 0, sizeof(ll));
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ll.sll_family = PF_PACKET;
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ll.sll_ifindex = ifindex1;
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ll.sll_protocol = htons(HWSIM_ETHERTYPE);
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if (bind(s1, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
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perror("bind");
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goto fail;
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}
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memset(&ll, 0, sizeof(ll));
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ll.sll_family = PF_PACKET;
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ll.sll_ifindex = ifindex2;
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ll.sll_protocol = htons(HWSIM_ETHERTYPE);
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if (bind(s2, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
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perror("bind");
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goto fail;
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}
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tx(s1, s_ifname, ifindex1, addr1, addr2, tos);
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tx(s1, s_ifname, ifindex1, addr1, bcast, tos);
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tx(s2, d_ifname, ifindex2, addr2, addr1, tos);
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tx(s2, d_ifname, ifindex2, addr2, bcast, tos);
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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memset(&res, 0, sizeof(res));
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for (;;) {
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int r;
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FD_ZERO(&rfds);
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FD_SET(s1, &rfds);
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FD_SET(s2, &rfds);
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r = select(s2 + 1, &rfds, NULL, NULL, &tv);
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if (r < 0) {
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perror("select");
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goto fail;
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}
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if (r == 0)
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break; /* timeout */
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if (FD_ISSET(s1, &rfds))
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rx(s1, 1, s_ifname, ifindex1, &res);
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if (FD_ISSET(s2, &rfds))
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rx(s2, 2, d_ifname, ifindex2, &res);
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if (res.rx_unicast1 && res.rx_broadcast1 &&
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res.rx_unicast2 && res.rx_broadcast2) {
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ret = 0;
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break;
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}
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}
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if (ret) {
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printf("Did not receive all expected frames:\n"
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"rx_unicast1=%u rx_broadcast1=%u "
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"rx_unicast2=%u rx_broadcast2=%u\n",
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res.rx_unicast1, res.rx_broadcast1,
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res.rx_unicast2, res.rx_broadcast2);
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} else {
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printf("Both unicast and broadcast working in both "
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"directions\n");
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}
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fail:
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close(s1);
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close(s2);
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return ret;
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}
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