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diff --git a/tools/tools/netmap/pkt-gen.8 b/tools/tools/netmap/pkt-gen.8
--- a/tools/tools/netmap/pkt-gen.8
+++ b/tools/tools/netmap/pkt-gen.8
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 21, 2020
+.Dd April 21, 2023
.Dt PKT-GEN 8
.Os
.Sh NAME
@@ -150,7 +150,7 @@
mode), or a TX/RX ring pair.
The number of
.Ar threads
-must be less than or equal to the number of TX (or RX) ring available
+must be less than or equal to the number of TX (or RX) rings available
in the device specified by
.Ar interface .
.It Fl T Ar report_ms
@@ -288,7 +288,8 @@
You must set the destination MAC address for
packets to be received by the target host.
.Bd -literal -offset indent
-pkt-gen -i netmap:ncxl0 -f tx -s 172.16.0.1:53 -d 172.16.1.3:53 -D 00:07:43:29:2a:e0
+pkt-gen -i netmap:ncxl0 -f tx -s 172.16.0.1:53 -d 172.16.1.3:53 \e
+-D 00:07:43:29:2a:e0
.Ed
.Sh SEE ALSO
.Xr netmap 4 ,
diff --git a/tools/tools/netmap/pkt-gen.c b/tools/tools/netmap/pkt-gen.c
--- a/tools/tools/netmap/pkt-gen.c
+++ b/tools/tools/netmap/pkt-gen.c
@@ -283,6 +283,7 @@
#define OPT_RANDOM_SRC 512
#define OPT_RANDOM_DST 1024
#define OPT_PPS_STATS 2048
+#define OPT_UPDATE_CSUM 4096
int dev_type;
#ifndef NO_PCAP
pcap_t *p;
@@ -1005,6 +1006,85 @@
else
update_ip6(pkt, t);
}
+
+static void
+update_ip_size(struct pkt *pkt, int size)
+{
+ struct ip ip;
+ struct udphdr udp;
+ uint16_t oiplen, niplen;
+ uint16_t nudplen;
+ uint16_t ip_sum = 0;
+
+ memcpy(&ip, &pkt->ipv4.ip, sizeof(ip));
+ memcpy(&udp, &pkt->ipv4.udp, sizeof(udp));
+
+ oiplen = ntohs(ip.ip_len);
+ niplen = size - sizeof(struct ether_header);
+ ip.ip_len = htons(niplen);
+ nudplen = niplen - sizeof(struct ip);
+ udp.uh_ulen = htons(nudplen);
+ ip_sum = new_udp_sum(ip_sum, oiplen, niplen);
+
+ /* update checksums */
+ if (ip_sum != 0)
+ ip.ip_sum = ~cksum_add(~ip.ip_sum, htons(ip_sum));
+
+ udp.uh_sum = 0;
+ /* Magic: taken from sbin/dhclient/packet.c */
+ udp.uh_sum = wrapsum(
+ checksum(&udp, sizeof(udp), /* udp header */
+ checksum(pkt->ipv4.body, /* udp payload */
+ nudplen - sizeof(udp),
+ checksum(&ip.ip_src, /* pseudo header */
+ 2 * sizeof(ip.ip_src),
+ IPPROTO_UDP + (u_int32_t)ntohs(udp.uh_ulen)))));
+
+ memcpy(&pkt->ipv4.ip, &ip, sizeof(ip));
+ memcpy(&pkt->ipv4.udp, &udp, sizeof(udp));
+}
+
+static void
+update_ip6_size(struct pkt *pkt, int size)
+{
+ struct ip6_hdr ip6;
+ struct udphdr udp;
+ uint16_t niplen, nudplen;
+ uint32_t csum;
+
+ memcpy(&ip6, &pkt->ipv6.ip, sizeof(ip6));
+ memcpy(&udp, &pkt->ipv6.udp, sizeof(udp));
+
+ nudplen = niplen = size - sizeof(struct ether_header) - sizeof(ip6);
+ ip6.ip6_plen = htons(niplen);
+ udp.uh_ulen = htons(nudplen);
+
+ /* Save part of pseudo header checksum into csum */
+ udp.uh_sum = 0;
+ csum = IPPROTO_UDP << 24;
+ csum = checksum(&csum, sizeof(csum), nudplen);
+ udp.uh_sum = wrapsum(
+ checksum(&udp, sizeof(udp), /* udp header */
+ checksum(pkt->ipv6.body, /* udp payload */
+ nudplen - sizeof(udp),
+ checksum(&pkt->ipv6.ip.ip6_src, /* pseudo header */
+ 2 * sizeof(pkt->ipv6.ip.ip6_src), csum))));
+
+ memcpy(&pkt->ipv6.ip, &ip6, sizeof(ip6));
+ memcpy(&pkt->ipv6.udp, &udp, sizeof(udp));
+}
+
+static void
+update_size(struct pkt *pkt, struct targ *t, int size)
+{
+ if (t->g->options & OPT_UPDATE_CSUM) {
+ if (t->g->af == AF_INET)
+ update_ip_size(pkt, size);
+ else
+ update_ip6_size(pkt, size);
+ }
+}
+
/*
* initialize one packet and prepare for the next one.
* The copy could be done better instead of repeating it each time.
@@ -1744,6 +1824,7 @@
size = nrand48(targ->seed) %
(targ->g->pkt_size - targ->g->pkt_min_size) +
targ->g->pkt_min_size;
+ update_size(pkt, targ, size);
}
m = send_packets(txring, pkt, frame, size, targ,
limit, options);
@@ -2528,6 +2609,7 @@
" OPT_RANDOM_SRC 512\n"
" OPT_RANDOM_DST 1024\n"
" OPT_PPS_STATS 2048\n"
+" OPT_UPDATE_CSUM 4096\n"
"",
cmd);
exit(errcode);
@@ -3284,8 +3366,8 @@
g.tx_period.tv_nsec = g.tx_period.tv_nsec % 1000000000;
}
if (g.td_type == TD_TYPE_SENDER)
- D("Sending %d packets every %ld.%09ld s",
- g.burst, g.tx_period.tv_sec, g.tx_period.tv_nsec);
+ D("Sending %d packets every %jd.%09ld s",
+ g.burst, (intmax_t)g.tx_period.tv_sec, g.tx_period.tv_nsec);
/* Install ^C handler. */
global_nthreads = g.nthreads;
sigemptyset(&ss);

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