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Changes to interface handling on traditional Unices:

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o  Aliases are interpreted as secondary addresses.
  o  When the system doesn't supply interface indices, generate
     our ones.
This commit is contained in:
Martin Mares 1999-08-03 19:30:20 +00:00
parent 5e13ffe6f4
commit 9273035403
2 changed files with 25 additions and 12 deletions
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5
TODO
View file

@ -4,8 +4,6 @@ Core
- io.c: refuse old-style multicasts for unnumbered interfaces? - io.c: refuse old-style multicasts for unnumbered interfaces?
- prefer loopback addresses as router IDs (dummy interface?)
- config: executable config files - config: executable config files
- do we really need preconfig? - do we really need preconfig?
@ -13,7 +11,6 @@ Core
- counters (according to SNMP MIB?) - counters (according to SNMP MIB?)
- better memory allocators - better memory allocators
- default preferences of protocols: prefer BGP over OSPF/RIP external routes? - default preferences of protocols: prefer BGP over OSPF/RIP external routes?
- secondary addresses -> subinterfaces or ignore
- static: check validity of route destination? - static: check validity of route destination?
@ -23,8 +20,6 @@ Core
- netlink: import Linux route attributes to our rta's, so that they can be filtered? - netlink: import Linux route attributes to our rta's, so that they can be filtered?
- iface: when seen an invalid broadcast, fix it up or at least report
- iface: we always need ifindex at least for PtP links (OSPF)
- iface: interface filters should support filtering by IP address as well - iface: interface filters should support filtering by IP address as well
- iface: SIOCGIFINDEX exists on glibc systems, but it doesn't work on 2.0.x kernels! - iface: SIOCGIFINDEX exists on glibc systems, but it doesn't work on 2.0.x kernels!

30
sysdep/unix/krt-iface.c
View file

@ -32,10 +32,11 @@ scan_ifs(struct ifreq *r, int cnt)
{ {
struct iface i, *pi; struct iface i, *pi;
struct ifa a; struct ifa a;
char *err; char *err, *colon;
unsigned fl; unsigned fl;
ip_addr netmask; ip_addr netmask;
int l; int l;
int sec = 0;
if_start_update(); if_start_update();
for (cnt /= sizeof(struct ifreq); cnt; cnt--, r++) for (cnt /= sizeof(struct ifreq); cnt; cnt--, r++)
@ -43,11 +44,11 @@ scan_ifs(struct ifreq *r, int cnt)
bzero(&i, sizeof(i)); bzero(&i, sizeof(i));
bzero(&a, sizeof(a)); bzero(&a, sizeof(a));
DBG("%s\n", r->ifr_name); DBG("%s\n", r->ifr_name);
if (strchr(r->ifr_name, ':')) if (colon = strchr(r->ifr_name, ':'))
{ {
/* FIXME: Honour aliases as secondary addresses? */ /* It's an alias -- let's interpret it as a secondary interface address */
DBG("Alias, ignored.\n"); sec = 1;
continue; *colon = 0;
} }
strncpy(i.name, r->ifr_name, sizeof(i.name) - 1); strncpy(i.name, r->ifr_name, sizeof(i.name) - 1);
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.ip, NULL); get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.ip, NULL);
@ -135,9 +136,26 @@ scan_ifs(struct ifreq *r, int cnt)
else else
i.index = r->ifr_ifindex; i.index = r->ifr_ifindex;
#else #else
/* FIXME: What else? Guess ifindex (we need it at least for OSPF on unnumbered links)? */ /*
* The kernel doesn't give us real ifindices, but we still need them
* at least for OSPF unnumbered links. So let's make them up ourselves.
*/
if (pi = if_find_by_name(i.name))
i.index = pi->index;
else
{
static int if_index_counter = 1;
i.index = if_index_counter++;
}
#endif #endif
pi = NULL;
if (sec)
{
a.flags |= IA_SECONDARY;
pi = if_find_by_index(i.index);
}
if (!pi)
pi = if_update(&i); pi = if_update(&i);
a.iface = pi; a.iface = pi;
ifa_update(&a); ifa_update(&a);