Date: Fri, 13 Apr 2012 11:53:59 +1200 From: Andrew Thompson <thompsa@FreeBSD.org> To: freebsd-net <freebsd-net@freebsd.org> Subject: getifaddrs & ipv6 scope Message-ID: <CAFAOGNQv3pW2RwmEkcv3Oez7eP%2BF_q872ayj0=UgxsytBkj3ug@mail.gmail.com>
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Hi,
I have noticed that getifaddrs() does not have sin6_scope_id set to
the interface id for link local addresses on AF_INET6 types. Running
the following program gives different results on Linux
FreeBSD:
dev: bge0 address: <fe80:2::a6ba:dbff:fe03:d69> scope 0
dev: xl0 address: <fe80:4::204:75ff:fedc:39c1> scope 0
dev: lo0 address: <::1> scope 0
dev: lo0 address: <fe80:5::1> scope 0
Linux:
dev: lo address: <::1> scope 0
dev: eth1 address: <2404:130:0:1000:204:75ff:febc:b8f0> scope 0
dev: eth1 address: <fe80::204:75ff:febc:b8f0%eth1> scope 2
dev: eth0 address: <fe80::222:4dff:fe54:3b1d%eth0> scope 3
Should FreeBSD be setting sin6_scope_id?
Andrew
----
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int
main(int argc, char *argv[])
{
struct ifaddrs *ifaddr, *ifa;
char host[NI_MAXHOST];
int rc;
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
exit(EXIT_FAILURE);
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (ifa->ifa_addr == NULL)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
rc = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6),
host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (rc != 0) {
printf("getnameinfo() failed: %s\n", gai_strerror(rc));
exit(EXIT_FAILURE);
}
printf("dev: %-8s address: <%s> scope %d\n",
ifa->ifa_name, host, in6->sin6_scope_id);
}
freeifaddrs(ifaddr);
exit(EXIT_SUCCESS);
}
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