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@@ -17,6 +17,7 @@
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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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@@ -26,11 +27,28 @@
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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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+
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+ for (i = 0; i < len / 2; i++)
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+ sum += *pos++;
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+
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+ while (sum >> 16)
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+ sum = (sum & 0xffff) + (sum >> 16);
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+
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+ return sum ^ 0xffff;
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+}
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+
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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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{
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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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@@ -40,8 +58,19 @@ static void tx(int s, const char *ifname, int ifindex,
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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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- pos = (char *) (eth + 1);
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- for (i = 0; i < sizeof(buf) - sizeof(*eth); i++)
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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 = 0;
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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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@@ -62,6 +91,7 @@ static void rx(int s, int iface, const char *ifname, int ifindex,
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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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@@ -76,12 +106,13 @@ static void rx(int s, int iface, const char *ifname, int 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\n");
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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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- pos = (char *) (eth + 1);
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- for (i = 0; i < sizeof(buf) - 1 - sizeof(*eth); i++) {
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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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