Date: Fri, 11 Mar 2011 14:38:31 +0900 From: Hajimu UMEMOTO <ume@mahoroba.org> To: Carl Johnson <carlj@peak.org> Cc: freebsd-stable@freebsd.org Subject: Re: if_bridge and IPv6 Message-ID: <yge4o7afc88.wl%ume@mahoroba.org> In-Reply-To: <87oc5i5j5n.fsf@oak.localnet> References: <FAF0B5E9-029E-4345-BFC4-98C0DFF505CC@gsoft.com.au> <87oc5i5j5n.fsf@oak.localnet>
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Hi,
>>>>> On Thu, 10 Mar 2011 21:19:00 -0800
>>>>> Carl Johnson <carlj@peak.org> said:
carlj> You should be able to do something like the following:
carlj> ifconfig bridge0 inet6 fe80:: eui64 add
carlj> That assumes that it has a MAC address already assigned. I can't help
carlj> if it doesn't have one yet.
Unfortunately, eui64 option doesn't support link-local address.
You need to specify link-local address, explicitly.
Here is a patch to support it.
Sincerely,
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Content-Disposition: attachment; filename="ifconfig-af_inet6.c-linklocal.diff"
Content-Transfer-Encoding: 7bit
Index: sbin/ifconfig/af_inet6.c
diff -u -p sbin/ifconfig/af_inet6.c.orig sbin/ifconfig/af_inet6.c
--- sbin/ifconfig/af_inet6.c.orig 2009-11-21 20:28:57.783110487 +0900
+++ sbin/ifconfig/af_inet6.c 2009-11-23 21:00:02.212252557 +0900
@@ -36,6 +36,9 @@ static const char rcsid[] =
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/ethernet.h>
#include <err.h>
#include <stdio.h>
@@ -130,6 +133,56 @@ setip6vltime(const char *seconds, int du
setip6lifetime("vltime", seconds, s, afp);
}
+static struct sockaddr_dl *
+getsdl(struct ifaddrs *ifap, char *ifname)
+{
+ struct ifaddrs *ifa;
+ struct sockaddr_dl *sdl = NULL;
+
+ for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+ if (ifname != NULL && strcmp(ifa->ifa_name, ifname) != 0)
+ continue;
+ if (ifa->ifa_addr == NULL)
+ continue;
+ if (ifa->ifa_addr->sa_family != AF_LINK)
+ continue;
+ sdl = (struct sockaddr_dl *)ifa->ifa_addr;
+ if (sdl == NULL)
+ continue;
+ if (sdl->sdl_type != IFT_ETHER ||
+ sdl->sdl_alen != ETHER_ADDR_LEN) {
+ sdl = NULL;
+ continue;
+ }
+ break;
+ }
+ return (sdl);
+}
+
+static void
+link2eui64(struct ifaddrs *ifap, struct in6_addr *in6)
+{
+ struct sockaddr_dl *sdl;
+ char *cp;
+
+ sdl = getsdl(ifap, name);
+ if (sdl == NULL) {
+ sdl = getsdl(ifap, NULL);
+ if (sdl == NULL)
+ errx(EXIT_FAILURE, "cannot find interface information");
+ }
+ cp = (char *)(sdl->sdl_data + sdl->sdl_nlen);
+ in6->s6_addr[8] = cp[0];
+ in6->s6_addr[8] ^= 0x02; /* reverse the u/l bit*/
+ in6->s6_addr[9] = cp[1];
+ in6->s6_addr[10] = cp[2];
+ in6->s6_addr[11] = 0xff;
+ in6->s6_addr[12] = 0xfe;
+ in6->s6_addr[13] = cp[3];
+ in6->s6_addr[14] = cp[4];
+ in6->s6_addr[15] = cp[5];
+}
+
static void
setip6eui64(const char *cmd, int dummy __unused, int s,
const struct afswtch *afp)
@@ -156,10 +209,13 @@ setip6eui64(const char *cmd, int dummy _
}
}
}
- if (!lladdr)
- errx(EXIT_FAILURE, "could not determine link local address");
-
- memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
+ if (!lladdr) {
+ if (!IN6_IS_ADDR_LINKLOCAL(in6))
+ errx(EXIT_FAILURE,
+ "could not determine link local address");
+ link2eui64(ifap, in6);
+ } else
+ memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
freeifaddrs(ifap);
}
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--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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