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Add a new option, -P, to pkt-gen which reads a single packet from a stored

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pcap file and transmits it instead of the default UDP packet.

Reviewed by:	luigi
MFC after:	2 weeks
This commit is contained in:
George V. Neville-Neil 2014-10-11 21:43:05 +00:00
parent e58fde506c
commit f284c7376a
1 changed files with 39 additions and 6 deletions
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45
tools/tools/netmap/pkt-gen.c
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@ -202,6 +202,7 @@ struct glob_arg {
int dummy_send;
int virt_header; /* send also the virt_header */
int extra_bufs; /* goes in nr_arg3 */
char *packet_file; /* -P option */
};
enum dev_type { DEV_NONE, DEV_NETMAP, DEV_PCAP, DEV_TAP };
@ -224,6 +225,7 @@ struct targ {
int affinity;
struct pkt pkt;
void *frame;
};
@ -613,6 +615,28 @@ initialize_packet(struct targ *targ)
indirect_payload : default_payload;
int i, l0 = strlen(payload);
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *file;
struct pcap_pkthdr *header;
const unsigned char *packet;
/* Read a packet from a PCAP file if asked. */
if (targ->g->packet_file != NULL) {
if ((file = pcap_open_offline(targ->g->packet_file,
errbuf)) == NULL)
D("failed to open pcap file %s",
targ->g->packet_file);
if (pcap_next_ex(file, &header, &packet) < 0)
D("failed to read packet from %s",
targ->g->packet_file);
if ((targ->frame = malloc(header->caplen)) == NULL)
D("out of memory");
bcopy(packet, (unsigned char *)targ->frame, header->caplen);
targ->g->pkt_size = header->caplen;
pcap_close(file);
return;
}
/* create a nice NUL-terminated string */
for (i = 0; i < paylen; i += l0) {
if (l0 > paylen - i)
@ -783,7 +807,6 @@ pinger_body(void *data)
frame += sizeof(targ->pkt.vh) - targ->g->virt_header;
size = targ->g->pkt_size + targ->g->virt_header;
if (targ->g->nthreads > 1) {
D("can only ping with 1 thread");
return NULL;
@ -1038,10 +1061,15 @@ sender_body(void *data)
void *frame;
int size;
frame = pkt;
frame += sizeof(pkt->vh) - targ->g->virt_header;
size = targ->g->pkt_size + targ->g->virt_header;
if (targ->frame == NULL) {
frame = pkt;
frame += sizeof(pkt->vh) - targ->g->virt_header;
size = targ->g->pkt_size + targ->g->virt_header;
} else {
frame = targ->frame;
size = targ->g->pkt_size;
}
D("start, fd %d main_fd %d", targ->fd, targ->g->main_fd);
if (setaffinity(targ->thread, targ->affinity))
goto quit;
@ -1366,6 +1394,7 @@ usage(void)
"\t-R rate in packets per second\n"
"\t-X dump payload\n"
"\t-H len add empty virtio-net-header with size 'len'\n"
"\t-P file load packet from pcap file"
"",
cmd);
@ -1638,7 +1667,7 @@ main(int arc, char **argv)
g.virt_header = 0;
while ( (ch = getopt(arc, argv,
"a:f:F:n:i:Il:d:s:D:S:b:c:o:p:T:w:WvR:XC:H:e:m:")) != -1) {
"a:f:F:n:i:Il:d:s:D:S:b:c:o:p:T:w:WvR:XC:H:e:m:P:")) != -1) {
struct sf *fn;
switch(ch) {
@ -1781,7 +1810,11 @@ main(int arc, char **argv)
D("unrecognized monitor mode %s", optarg);
}
break;
case 'P':
g.packet_file = strdup(optarg);
break;
}
}
if (g.ifname == NULL) {