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platform: don't treat ifindex zero special in nmp_lookup_init_object()

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So far, certain NMObject types could not have an ifindex of zero. Hence,
nmp_lookup_init_object() took such an ifindex to mean lookup all objects
of that type.

Soon, we will support blackhole/unreachable/prohibit route types, which
have their ifindex set to zero. It is still useful to lookup those routes
types via nmp_lookup_init_object().

Change behaviour how to interpret the ifindex. Note that this also
affects various callers of nmp_lookup_init_object(). If somebody was
relying on the previous behavior, it would need fixing.
This commit is contained in:
Thomas Haller
2022-02-02 21:17:48 +01:00
parent 1123d3a5fb
commit d4ad9666bd
3 changed files with 19 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/core/platform/nm-fake-platform.c
View File

@@ -957,11 +957,10 @@ ipx_address_delete(NMPlatform *platform,
peer_addr_i = peer_addr ? *((guint32 *) peer_addr) : 0;
nmp_cache_iter_for_each (&iter,
nm_platform_lookup_object(platform,
addr_family == AF_INET
? NMP_OBJECT_TYPE_IP4_ADDRESS
: NMP_OBJECT_TYPE_IP6_ADDRESS,
0),
nm_platform_lookup_obj_type(platform,
addr_family == AF_INET
? NMP_OBJECT_TYPE_IP4_ADDRESS
: NMP_OBJECT_TYPE_IP6_ADDRESS),
&o) {
const NMPObject *obj_old = NULL;
@@ -1139,7 +1138,7 @@ ip_route_add(NMPlatform *platform,
gboolean has_route_to_gw = FALSE;
nmp_cache_iter_for_each (&iter,
nm_platform_lookup_object(platform, NMP_OBJECT_GET_TYPE(obj), 0),
nm_platform_lookup_obj_type(platform, NMP_OBJECT_GET_TYPE(obj)),
&o) {
if (addr_family == AF_INET) {
const NMPlatformIP4Route *item = NMP_OBJECT_CAST_IP4_ROUTE(o);

6
src/core/platform/tests/test-common.c
View File

@@ -102,7 +102,11 @@ nmtstp_platform_ip_address_find(NMPlatform *self, int ifindex, int addr_family,
nm_assert_addr_family(addr_family);
nm_assert(addr);
nmp_lookup_init_object(&lookup, NMP_OBJECT_TYPE_IP_ADDRESS(IS_IPv4), ifindex);
if (ifindex > 0)
nmp_lookup_init_object(&lookup, NMP_OBJECT_TYPE_IP_ADDRESS(IS_IPv4), ifindex);
else
nmp_lookup_init_obj_type(&lookup, NMP_OBJECT_TYPE_IP_ADDRESS(IS_IPv4));
nm_platform_iter_obj_for_each (&iter, self, &lookup, &obj) {
const NMPlatformIPAddress *a = NMP_OBJECT_CAST_IP_ADDRESS(obj);

10
src/libnm-platform/nmp-object.c
View File

@@ -2142,7 +2142,15 @@ nmp_lookup_init_object(NMPLookup *lookup, NMPObjectType obj_type, int ifindex)
NMP_OBJECT_TYPE_QDISC,
NMP_OBJECT_TYPE_TFILTER));
if (ifindex <= 0) {
if (G_UNLIKELY(
(ifindex < 0)
|| (ifindex == 0
&& !NM_IN_SET(obj_type, NMP_OBJECT_TYPE_IP4_ROUTE, NMP_OBJECT_TYPE_IP6_ROUTE)))) {
/* This function used to have a fallback that meant to lookup all objects, if
* ifindex is non-positive. As routes can have a zero ifindex, that fallback is
* confusing and no longer supported. Only have this code, to catch accidental bugs
* after the API change. */
nm_assert_not_reached();
return nmp_lookup_init_obj_type(lookup, obj_type);
}