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arp(8): allow -i with -s

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arp(8) usually disallows adding a static ARP entry for an IP address
which is not configured on a local interface.

Change this to allow such ARP entries to be added if '-i' is provided to
specify the interface the ARP entry relates to.

Due to limitations in the kernel lltable, this still requires that a
host route exists for the target address, but allows static ARP entries
to be configured to proxy ARP for, e.g., local jails which use an IPv4
address with a /32 route.

Reviewed by: imp, zlei
Pull Request: https://github.com/freebsd/freebsd-src/pull/1220
This commit is contained in:
Lexi Winter 2024-05-05 19:21:06 +01:00 committed by Warner Losh
parent bedbaee805
commit 2356b60be7
1 changed files with 2 additions and 2 deletions
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4
usr.sbin/arp/arp.c
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@ -144,7 +144,7 @@ main(int argc, char *argv[])
if (!func)
func = F_GET;
if (opts.rifname) {
if (func != F_GET && !(func == F_DELETE && opts.aflag))
if (func != F_GET && func != F_SET && !(func == F_DELETE && opts.aflag))
xo_errx(1, "-i not applicable to this operation");
if ((opts.rifindex = if_nametoindex(opts.rifname)) == 0) {
if (errno == ENXIO)
@ -375,7 +375,7 @@ set(int argc, char **argv)
}
}
#ifndef WITHOUT_NETLINK
return (set_nl(0, dst, &sdl_m, host));
return (set_nl(opts.rifindex, dst, &sdl_m, host));
#else
return (set_rtsock(dst, &sdl_m, host));
#endif