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Added support for setting the per-interface MTU.

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This commit is contained in:
David Greenman 1994-08-08 10:45:06 +00:00
parent f847d045bf
commit 4db32b036d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=1940
2 changed files with 34 additions and 8 deletions
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8
sbin/ifconfig/ifconfig.8
View File

@ -174,6 +174,14 @@ The routing metric is used by the routing protocol
Higher metrics have the effect of making a route
less favorable; metrics are counted as addition hops
to the destination network or host.
.It Cm mtu Ar n
Set the maximum transmission unit of the interface to
.Ar n ,
default is interface specific.
The mtu is used to limit the size of packets that are transmitted on an
interface.
Not all interfaces support setting the mtu, and some interfaces have
range restrictions.
.It Cm netmask Ar mask
(Inet and ISO)
Specify how much of the address to reserve for subdividing

34
sbin/ifconfig/ifconfig.c
View File

@ -76,6 +76,7 @@ struct sockaddr_in netmask;
char name[30];
int flags;
int metric;
int mtu;
int nsellength = 1;
int setaddr;
int setipdst;
@ -86,7 +87,7 @@ int s;
extern int errno;
int setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
int setifmetric(), setifbroadaddr(), setifipdst();
int setifmetric(), setifmtu(), setifbroadaddr(), setifipdst();
int notealias(), setsnpaoffset(), setnsellength(), notrailers();
#define NEXTARG 0xffffff
@ -118,12 +119,13 @@ struct cmd {
{ "ipdst", NEXTARG, setifipdst },
{ "snpaoffset", NEXTARG, setsnpaoffset },
{ "nsellength", NEXTARG, setnsellength },
{ "link0", IFF_LINK0, setifflags } ,
{ "-link0", -IFF_LINK0, setifflags } ,
{ "link1", IFF_LINK1, setifflags } ,
{ "-link1", -IFF_LINK1, setifflags } ,
{ "link2", IFF_LINK2, setifflags } ,
{ "-link2", -IFF_LINK2, setifflags } ,
{ "link0", IFF_LINK0, setifflags },
{ "-link0", -IFF_LINK0, setifflags },
{ "link1", IFF_LINK1, setifflags },
{ "-link1", -IFF_LINK1, setifflags },
{ "link2", IFF_LINK2, setifflags },
{ "-link2", -IFF_LINK2, setifflags },
{ "mtu", NEXTARG, setifmtu },
{ 0, 0, setifaddr },
{ 0, 0, setifdstaddr },
};
@ -167,10 +169,11 @@ main(argc, argv)
register struct afswtch *rafp;
if (argc < 2) {
fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s",
fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s%s",
"\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
"[ netmask mask ] ]\n",
"\t[ metric n ]\n",
"\t[ mtu n ]\n",
"\t[ arp | -arp ]\n",
"\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ] \n");
exit(1);
@ -203,6 +206,10 @@ main(argc, argv)
perror("ioctl (SIOCGIFMETRIC)");
else
metric = ifr.ifr_metric;
if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0)
perror("ioctl (SIOCGIFMTU)");
else
mtu = ifr.ifr_mtu;
if (argc == 0) {
status();
exit(0);
@ -360,6 +367,15 @@ setifmetric(val)
perror("ioctl (set metric)");
}
setifmtu(val)
char *val;
{
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
ifr.ifr_mtu = atoi(val);
if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
perror("ioctl (set mtu)");
}
setsnpaoffset(val)
char *val;
{
@ -383,6 +399,8 @@ status()
printb("flags", flags, IFFBITS);
if (metric)
printf(" metric %d", metric);
if (mtu)
printf(" mtu %d", mtu);
putchar('\n');
if ((p = afp) != NULL) {
(*p->af_status)(1);