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libiproute/ll_map.c: fix bug 279

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("On-demand net module loading fails with CONFIG_FEATURE_IFUPDOWN_IP")
This commit is contained in:
Denis Vlasenko 2006-09-30 00:18:16 +00:00
parent 70210168fc
commit 7935a5a992
1 changed files with 30 additions and 6 deletions
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36
networking/libiproute/ll_map.c
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@ -17,8 +17,11 @@
#include "libnetlink.h"
#include "ll_map.h"
struct idxmap
{
#include <sys/socket.h> /* socket() */
#include <net/if.h> /* struct ifreq and co. */
#include <sys/ioctl.h> /* ioctl() & SIOCGIFINDEX */
struct idxmap {
struct idxmap * next;
int index;
int type;
@ -129,6 +132,7 @@ int ll_name_to_index(char *name)
static char ncache[16];
static int icache;
struct idxmap *im;
int sock_fd;
int i;
if (name == NULL)
@ -144,19 +148,39 @@ int ll_name_to_index(char *name)
}
}
}
/* We have not found the interface in our cache, but the kernel
* may still know about it. One reason is that we may be using
* module on-demand loading, which means that the kernel will
* load the module and make the interface exist only when
* we explicitely request it (check for dev_load() in net/core/dev.c).
* I can think of other similar scenario, but they are less common...
* Jean II */
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd) {
struct ifreq ifr;
int ret;
strncpy(ifr.ifr_name, name, IFNAMSIZ);
ifr.ifr_ifindex = -1;
ret = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
close(sock_fd);
if (ret >= 0)
/* In theory, we should redump the interface list
* to update our cache, this is left as an exercise
* to the reader... Jean II */
return ifr.ifr_ifindex;
}
return 0;
}
int ll_init_map(struct rtnl_handle *rth)
{
if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
perror("Cannot send dump request");
exit(1);
bb_perror_msg_and_die("cannot send dump request");
}
if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
bb_error_msg_and_die("dump terminated");
}
return 0;
}