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introduced a flag bit "ND6_IFF_ACCEPT_RTADV" in the nd_ifinfo structure to

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control whether to accept RAs per-interface basis.
the new stuff ensures the backward compatibility;
- the kernel does not accept RAs on any interfaces by default.
- since the default value of the flag bit is on, the kernel accepts RAs
  on all interfaces when net.inet6.ip6.accept_rtadv is 1.

Obtained from:	KAME
MFC after:	1 week
This commit is contained in:
Hajimu UMEMOTO 2003-08-05 14:57:11 +00:00
parent 5246b4ff88
commit 07cf047d5a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118498
5 changed files with 35 additions and 4 deletions
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7
sys/netinet6/nd6.c
View File

@ -191,7 +191,12 @@ nd6_ifattach(ifp)
ND.reachable = ND_COMPUTE_RTIME(ND.basereachable);
ND.retrans = RETRANS_TIMER;
ND.receivedra = 0;
ND.flags = ND6_IFF_PERFORMNUD;
/*
* Note that the default value of ip6_accept_rtadv is 0, which means
* we won't accept RAs by default even if we set ND6_IFF_ACCEPT_RTADV
* here.
*/
ND.flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV);
nd6_setmtu(ifp);
#undef ND
}

1
sys/netinet6/nd6.h
View File

@ -87,6 +87,7 @@ struct nd_ifinfo {
};
#define ND6_IFF_PERFORMNUD 0x1
#define ND6_IFF_ACCEPT_RTADV 0x2
struct in6_nbrinfo {
char ifname[IFNAMSIZ]; /* if name, e.g. "en0" */

7
sys/netinet6/nd6_rtr.c
View File

@ -217,8 +217,15 @@ nd6_ra_input(m, off, icmp6len)
union nd_opts ndopts;
struct nd_defrouter *dr;
/*
* We only accept RAs only when
* the system-wide variable allows the acceptance, and
* per-interface variable allows RAs on the receiving interface.
*/
if (ip6_accept_rtadv == 0)
goto freeit;
if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
goto freeit;
if (ip6->ip6_hlim != 255) {
nd6log((LOG_ERR,

11
usr.sbin/ndp/ndp.8
View File

@ -135,6 +135,17 @@ which means the flag should be cleared.
turn on or off NUD (Neighbor Unreachability Detection) on the
interface.
NUD is usually turned on by default.
.It Xo
.Ic accept_rtadv
.Xc
Specify whether or not to accept Router Advertisement messages
received on the
.Ar interface .
Note that the kernel does not accept Router Advertisement messages
unless the
.Li net.inet6.ip6.accept_rtadv
variable is non-0, even if the flag is on.
This flag is set to 1 by default.
.El
.It Fl n
Do not try to resolve numeric address to hostname.

13
usr.sbin/ndp/ndp.c
View File

@ -939,6 +939,9 @@ ifinfo(argc, argv)
}\
} while (0)
SETFLAG("nud", ND6_IFF_PERFORMNUD);
#ifdef ND6_IFF_ACCEPT_RTADV
SETFLAG("accept_rtadv", ND6_IFF_ACCEPT_RTADV);
#endif
ND.flags = newflags;
if (ioctl(s, SIOCSIFINFO_FLAGS, (caddr_t)&nd) < 0) {
@ -982,9 +985,13 @@ ifinfo(argc, argv)
#endif
if (ND.flags) {
printf("\nFlags: ");
if ((ND.flags & ND6_IFF_PERFORMNUD) != 0)
printf("PERFORMNUD ");
}
if ((ND.flags & ND6_IFF_PERFORMNUD))
printf("nud ");
#ifdef ND6_IFF_ACCEPT_RTADV
if ((ND.flags & ND6_IFF_ACCEPT_RTADV))
printf("accept_rtadv ");
#endif
}
putc('\n', stdout);
#undef ND