/*
* Find the network interfaces which have configured themselves.
* If the interface is present but not yet up (for example an
* ARPANET IMP), set the lookforinterfaces flag so we'll
* come back later and look again.
*/
void
ifinit(void)
{
struct interface ifs, *ifp;
size_t needed;
int mib[6], no_ipxaddr = 0, flags = 0;
char *buf, *cplim, *cp;
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
struct sockaddr_dl *sdl = NULL;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_IPX;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
quit("route-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
quit("malloc");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
lookforinterfaces = 0;
cplim = buf + needed;
for (cp = buf; cp < cplim; cp += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)cp;
if (ifm->ifm_type == RTM_IFINFO) {
bzero(&ifs, sizeof(ifs));
ifs.int_flags = flags = ifm->ifm_flags | IFF_INTERFACE;
if ((flags & IFF_UP) == 0 || no_ipxaddr)
lookforinterfaces = 1;
sdl = (struct sockaddr_dl *) (ifm + 1);
sdl->sdl_data[sdl->sdl_nlen] = 0;
no_ipxaddr = 1;
continue;
}
if (ifm->ifm_type != RTM_NEWADDR)
quit("ifinit: out of sync");
if ((flags & IFF_UP) == 0)
continue;
ifam = (struct ifa_msghdr *)ifm;
info.rti_addrs = ifam->ifam_addrs;
rt_xaddrs((char *)(ifam + 1), cp + ifam->ifam_msglen, &info);
if (ifaaddr == 0) {
syslog(LOG_ERR, "%s: (get addr)", sdl->sdl_data);
continue;
}
ifs.int_addr = *ifaaddr;
if (ifs.int_addr.sa_family != AF_IPX)
continue;
no_ipxaddr = 0;
if (ifs.int_flags & IFF_POINTOPOINT) {
if (brdaddr == 0) {
syslog(LOG_ERR, "%s: (get dstaddr)",
sdl->sdl_data);
continue;
}
if (brdaddr->sa_family == AF_UNSPEC) {
lookforinterfaces = 1;
continue;
}
ifs.int_dstaddr = *brdaddr;
}
if (ifs.int_flags & IFF_BROADCAST) {
if (brdaddr == 0) {
syslog(LOG_ERR, "%s: (get broadaddr)",
sdl->sdl_data);
continue;
}
ifs.int_dstaddr = *brdaddr;
}
if (ifs.int_flags & IFF_LOOPBACK) {
ifs.int_dstaddr = ifs.int_addr;
}
/*
* already known to us?
* what makes a POINTOPOINT if unique is its dst addr,
* NOT its source address
*/
if ( ((ifs.int_flags & IFF_POINTOPOINT) &&
if_ifwithdstaddr(&ifs.int_dstaddr)) ||
( ((ifs.int_flags & IFF_POINTOPOINT) == 0) &&
if_ifwithaddr(&ifs.int_addr)))
continue;
ifp = (struct interface *)
malloc(sdl->sdl_nlen + 1 + sizeof(ifs));
if (ifp == NULL) {
syslog(LOG_ERR, "IPXrouted: out of memory\n");
lookforinterfaces = 1;
break;
}
*ifp = ifs;
/*
* Count the # of directly connected networks
* and point to point links which aren't looped
* back to ourself. This is used below to
* decide if we should be a routing ``supplier''.
*/
if ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
if_ifwithaddr(&ifs.int_dstaddr) == 0)
externalinterfaces++;
/*
* If we have a point-to-point link, we want to act
* as a supplier even if it's our only interface,
* as that's the only way our peer on the other end
* can tell that the link is up.
*/
if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
supplier = 1;
ifp->int_name = (char *)(ifp + 1);
strcpy(ifp->int_name, sdl->sdl_data);
ifp->int_metric = ifam->ifam_metric;
ifp->int_next = ifnet;
ifnet = ifp;
traceinit(ifp);
addrouteforif(ifp);
}
if (externalinterfaces > 1 && supplier < 0)
supplier = 1;
free(buf);
}
void ifinit(void)
{
struct interface ifs, *ifp;
int s;
char buf[BUFSIZ], *cp, *cplim;
struct ifconf ifc;
struct ifreq ifreq, *ifr;
struct sockaddr_in *sin;
u_long i;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "socket: %m");
close(s);
return;
}
ifc.ifc_len = sizeof (buf);
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
syslog(LOG_ERR, "ioctl (get interface configuration)");
close(s);
return;
}
ifr = ifc.ifc_req;
lookforinterfaces = 0;
cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
for (cp = buf; cp < cplim;
cp += sizeof (ifr->ifr_name) + sizeof(ifr->ifr_ifru)) {
ifr = (struct ifreq *)cp;
bzero((char *)&ifs, sizeof(ifs));
ifs.int_addr = ifr->ifr_addr;
ifreq = *ifr;
if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "%s: ioctl (get interface flags)",
ifr->ifr_name);
continue;
}
ifs.int_flags =
ifreq.ifr_flags | IFF_INTERFACE;
if ((ifs.int_flags & IFF_UP) == 0 ||
ifr->ifr_addr.sa_family == AF_UNSPEC) {
lookforinterfaces = 1;
continue;
}
/* argh, this'll have to change sometime */
if (ifs.int_addr.sa_family != AF_INET)
continue;
if (ifs.int_flags & IFF_POINTOPOINT) {
if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "%s: ioctl (get dstaddr)",
ifr->ifr_name);
continue;
}
if (ifr->ifr_addr.sa_family == AF_UNSPEC) {
lookforinterfaces = 1;
continue;
}
ifs.int_dstaddr = ifreq.ifr_dstaddr;
}
/*
* already known to us?
* This allows multiple point-to-point links
* to share a source address (possibly with one
* other link), but assumes that there will not be
* multiple links with the same destination address.
*/
if (ifs.int_flags & IFF_POINTOPOINT) {
if (if_ifwithdstaddr(&ifs.int_dstaddr))
continue;
} else if (if_ifwithaddr(&ifs.int_addr))
continue;
if (ifs.int_flags & IFF_LOOPBACK) {
ifs.int_flags |= IFF_PASSIVE;
foundloopback = 1;
loopaddr = ifs.int_addr;
for (ifp = ifnet; ifp; ifp = ifp->int_next)
if (ifp->int_flags & IFF_POINTOPOINT)
add_ptopt_localrt(ifp);
}
if (ifs.int_flags & IFF_BROADCAST) {
if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "%s: ioctl (get broadaddr)",
ifr->ifr_name);
continue;
}
ifs.int_broadaddr = ifreq.ifr_broadaddr;
}
#ifdef SIOCGIFMETRIC
if (ioctl(s, SIOCGIFMETRIC, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "%s: ioctl (get metric)",
ifr->ifr_name);
ifs.int_metric = 0;
} else
ifs.int_metric = ifreq.ifr_metric;
#else
ifs.int_metric = 0;
#endif
/*
* Use a minimum metric of one;
* treat the interface metric (default 0)
* as an increment to the hop count of one.
*/
ifs.int_metric++;
if (ioctl(s, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "%s: ioctl (get netmask)",
ifr->ifr_name);
continue;
}
sin = (struct sockaddr_in *)&ifreq.ifr_addr;
ifs.int_subnetmask = ntohl(sin->sin_addr.s_addr);
sin = (struct sockaddr_in *)&ifs.int_addr;
i = ntohl(sin->sin_addr.s_addr);
if (IN_CLASSA(i))
ifs.int_netmask = IN_CLASSA_NET;
else if (IN_CLASSB(i))
ifs.int_netmask = IN_CLASSB_NET;
else
ifs.int_netmask = IN_CLASSC_NET;
ifs.int_net = i & ifs.int_netmask;
ifs.int_subnet = i & ifs.int_subnetmask;
if (ifs.int_subnetmask != ifs.int_netmask)
ifs.int_flags |= IFF_SUBNET;
ifp = (struct interface *)malloc(sizeof (struct interface));
if (ifp == 0) {
printf("routed: out of memory\n");
break;
}
*ifp = ifs;
/*
* Count the # of directly connected networks
* and point to point links which aren't looped
* back to ourself. This is used below to
* decide if we should be a routing ``supplier''.
*/
if ((ifs.int_flags & IFF_LOOPBACK) == 0 &&
((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
if_ifwithaddr(&ifs.int_dstaddr) == 0))
externalinterfaces++;
/*
* If we have a point-to-point link, we want to act
* as a supplier even if it's our only interface,
* as that's the only way our peer on the other end
* can tell that the link is up.
*/
if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
supplier = 1;
ifp->int_name = malloc(strlen(ifr->ifr_name) + 1);
if (ifp->int_name == 0) {
fprintf(stderr, "routed: ifinit: out of memory\n");
syslog(LOG_ERR, "routed: ifinit: out of memory\n");
close(s);
return;
}
strcpy(ifp->int_name, ifr->ifr_name);
*ifnext = ifp;
ifnext = &ifp->int_next;
traceinit(ifp);
addrouteforif(ifp);
}
if (externalinterfaces > 1 && supplier < 0)
supplier = 1;
close(s);
}
/*
* Reads kernel interface list and makes a copy for the local use.
*/
int
initialize_interface(void)
{
size_t needed;
int newif = FALSE, mib[6], flags = 0;
char *buf, *cplim, *cp;
struct interface *ifs, *ifp;
struct preflist *plp = NULL;
struct sockaddr_dl *sdl;
register struct if_msghdr *ifm;
register struct ifa_msghdr *ifam;
int externalinterfaces = 0;
/* I'm afraid of stack overflow. */
/* So work areas are malloc-ed. */
ifs = (struct interface *)malloc(sizeof(struct interface));
if (ifs == NULL) {
syslog(LOG_ERR, "work area malloc: %m");
return -1;
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET6;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
free(ifs);
syslog(LOG_ERR, "sysctl IFLIST 1 : %m");
return -1;
}
if ((buf = malloc(needed)) == NULL) {
free(ifs);
syslog(LOG_ERR, "sysctl IFLIST malloc : %m");
return -1;
}
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
free(ifs);
syslog(LOG_ERR, "sysctl IFLIST 2 : %m");
return -1;
}
for (ifp = ifnet; ifp; ifp = ifp->if_next) {
for (plp = ifp->if_ip6addr; plp; plp = plp->pl_next)
plp->pl_flag = PL_DELADDR;
for (plp = ifp->if_sladdr; plp; plp = plp->pl_next)
plp->pl_flag = PL_DELADDR;
for (plp = ifp->if_lladdr; plp; plp = plp->pl_next)
plp->pl_flag = PL_DELADDR;
}
/* so, ifp is NULL now */
cplim = buf + needed;
for (cp = buf; cp < cplim; cp += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)cp;
if (ifm->ifm_type == RTM_IFINFO) {
newif = FALSE;
ifp = (struct interface *)NULL;
if (ifm->ifm_addrs != RTA_IFP)
continue; /* sanity check */
sdl = (struct sockaddr_dl *)(ifm + 1);
if ((ifp = get_if_by_name(sdl)) == NULL) {
/* Hack! */
/* IFF_RUNNING means 'has at least one linklocal'
* <CAN_SEND> */
/* IFF_JOINED means 'joined multicast group'
* <CAN_RECEIVE> */
flags = ifm->ifm_flags & ~(IFF_RUNNING | IFF_JOINED);
if ((flags & IFF_UP) == 0) {
ifp = NULL;
continue;
}
bzero(ifs, sizeof(struct interface));
ifp = ifs; /* pointer copy */
newif = TRUE;
/* already bzeroed, so trailing 0 is not needed */
strncpy(ifp->if_name, sdl->sdl_data, sdl->sdl_nlen);
ifp->if_sdl = *sdl; /* struct copy */
ifp->if_flag = flags;
} else {
flags = ifm->ifm_flags;
if ((flags & IFF_UP) == 0) {
if (ifp->if_flag & IFF_JOINED)
drop_multicast_group(ifp);
ifp->if_flag = flags & ~(IFF_RUNNING | IFF_JOINED);
/* if_freeaddresses( ifp ); */
/* free will be done in install_address */
ifp = NULL;
continue;
}
if ((ifp->if_flag & IFF_UP) == 0) {
/* wake up */
/* counter reset */
ifp->if_badpkt = ifp->if_badrte = ifp->if_updates = 0;
}
ifp->if_flag = (flags & ~(IFF_RUNNING | IFF_JOINED))
| (ifp->if_flag & (IFF_RUNNING | IFF_JOINED));
ifp->if_sdl = *sdl; /* maybe MAC address
* was changed (?) */
}
ifp->if_metrc = ifm->ifm_data.ifi_metric;
/* maybe index was changed */
if_index(ifp) = ifm->ifm_index;
ifp->if_lmtu = ifm->ifm_data.ifi_mtu;
/* sanity check */
if (ifp->if_lmtu <
(sizeof(struct rip6) + rt6_hdrlen +
sizeof(struct route_entry))) {
/* rt6_hdrlen may be HUGER than DEFAULT(576) */
ifp->if_flag &= ~IFF_UP;
syslog(LOG_ERR, "Too small MTU");
ifp = NULL;
newif = FALSE;
}
continue;
} /* if(RTM_IFINFO) */
if (ifm->ifm_type != RTM_NEWADDR) {
free(buf);
free(ifs);
syslog(LOG_ERR, "sysctl illegal data");
return -1;
}
if (ifp == NULL)
continue;
/* ifp without IFF_UP shall reach here */
/* First message is RTM_NEWADDR (not RTM_IFINFO) shall
reach here */
ifam = (struct ifa_msghdr *)ifm;
rtinfo.rti_addrs = ifam->ifam_addrs;
plp = (struct preflist *)malloc(sizeof(struct preflist));
if (plp == NULL) {
free(buf);
free(ifs);
syslog(LOG_ERR, "initialize_interface: malloc failed");
return -1;
}
bzero((void *)plp, sizeof(struct preflist));
if (get_address(ifam->ifam_addrs, (char *)(ifam + 1),
(cp + ifam->ifam_msglen), plp) < 0) {
free(plp); /* plp = NULL; */
continue;
}
if (flags & IFF_POINTOPOINT) {
if (if_ifwithdstaddr(plp, ifp)) {
/* address already on the interface list ( marked
* OLDADDR ) */
free(plp); /* plp = NULL; */
continue;
}
} else {
int i;
#define vdst plp->pl_dest.s6_addr
#define vsrc1 plp->pl_pref.prf_addr.s6_addr
#define vsrc2 plp->pl_mask.s6_addr
for (i = 0; i < sizeof(struct in6_addr); i++)
vdst[i] = vsrc1[i] & vsrc2[i];
#undef vsrc2
#undef vsrc1
#undef vdst
if (if_ifwithaddr(plp, ifp)) {
/* address already on the interface list ( marked
* OLDADDR ) */
free(plp); /* plp = NULL; */
continue;
}
}
if (newif != FALSE) {
if ((ifp = (struct interface *)malloc(sizeof(struct interface))) == NULL) {
free(plp);
free(buf);
free(ifs);
syslog(LOG_ERR, "initialize_interface: new if malloc :%m");
return -1;
}
*ifp = *ifs; /* struct copy */
ifp->if_next = ifnet;
ifnet = ifp;
newif = FALSE; /* CAUTION: this interface loop has
* not been finished */
if ((ifp->if_flag & IFF_LOOPBACK) == 0)
externalinterfaces++;
}
add_address(plp, ifp); /* plp = NULL; */
if (ifp->if_flag & IFF_LOOPBACK)
foundloopback = 1;
} /* for */
/* Unnumbered P2P check */
for (ifp = ifnet; ifp; ifp = ifp->if_next) {
if (ifp->if_flag & IFF_POINTOPOINT
&& ifp->if_flag & IFF_UP) {
for (plp = ifp->if_ip6addr; plp; plp = plp->pl_next)
if (plp->pl_flag != PL_DELADDR)
if_duplicate(plp, ifp);
/* Duplicate address will be zeroed */
for (plp = ifp->if_sladdr; plp; plp = plp->pl_next)
if (plp->pl_flag != PL_DELADDR)
if_duplicate(plp, ifp);
/* Duplicate address will be zeroed */
}
}
/* Even if we have only one (external) interface, RIPng works */
/* MODE_UNSPEC really needed ? */
if (externalinterfaces == 0)
rt6_opmode = MODE_QUIET;
free(buf);
free(ifs);
return 0;
}
