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conf, dhcp, ndp: Fix message about default MTU, make NDP consistent

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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-09-07 11:19:57 +02:00
parent 8e9333616a
commit ec2b58ea4d
3 changed files with 16 additions and 4 deletions
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15
conf.c
View file

@ -617,7 +617,9 @@ static void usage(const char *name)
info(" /tmp/passt_ISO8601-TIMESTAMP_INSTANCE-NUMBER.pcap");
info( " -m, --mtu MTU Assign MTU via DHCP/NDP");
info( " default: no MTU assigned via DHCP/NDP options");
info( " a zero value disables assignment");
info( " default: 65520: maximum 802.3 MTU minus 802.3 header");
info( " length, rounded to 32 bits (IPv4 words)");
info( " -a, --address ADDR Assign IPv4 or IPv6 address ADDR");
info( " can be specified zero to two times (for IPv4 and IPv6)");
info( " default: use addresses from interface with default route");
@ -954,6 +956,12 @@ void conf(struct ctx *c, int argc, char **argv)
errno = 0;
c->mtu = strtol(optarg, NULL, 0);
if (!c->mtu) {
c->mtu = -1;
break;
}
if (c->mtu < ETH_MIN_MTU || c->mtu > (int)ETH_MAX_MTU ||
errno) {
err("Invalid MTU: %s", optarg);
@ -1132,6 +1140,11 @@ void conf(struct ctx *c, int argc, char **argv)
}
}
if (!c->mtu) {
c->mtu = (ETH_MAX_MTU - ETH_HLEN) /
sizeof(uint32_t) * sizeof(uint32_t);
}
get_routes(c);
get_addrs(c);

3
dhcp.c
View file

@ -49,7 +49,6 @@ struct opt {
static struct opt opts[255] = {
[1] = { 0, 4, { 0 }, 0, { 0 }, }, /* Mask */
[3] = { 0, 4, { 0 }, 0, { 0 }, }, /* Router */
[26] = { 0, 2, { 0xff, 0xf0 }, 0, { 0 }, }, /* MTU */
[51] = { 0, 4, { 0xff, 0xff, 0xff, 0xff }, 0, { 0 }, }, /* Lease time */
[53] = { 0, 1, { 0 }, 0, { 0 }, }, /* Type */
#define DHCPDISCOVER 1
@ -319,7 +318,7 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len)
*(unsigned long *)&opts[121].s[10] = c->gw4;
}
if (c->mtu) {
if (c->mtu != -1) {
opts[26].slen = 2;
opts[26].s[0] = c->mtu / 256;
opts[26].s[1] = c->mtu % 256;

2
ndp.c
View file

@ -116,7 +116,7 @@ int ndp(struct ctx *c, struct ethhdr *eh, size_t len)
memcpy(p, &c->addr6, 8); /* prefix */
p += 16;
if (c->mtu) {
if (c->mtu != -1) {
*p++ = 5; /* type */
*p++ = 1; /* length */
p += 2; /* reserved */