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platform: support the RT_VIA attribute for IPv4 routes

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The RT_VIA attribute is used to specify a gateway of a different
address family. It is currently used only for IPv4 routes.

[bgalvani@redhat.com: amended the commit message]
This commit is contained in:
Mary Strodl
2025-01-30 15:54:18 -05:00
committed by Beniamino Galvani
parent 84299ed17c
commit 2ffaebd4ae
2 changed files with 30 additions and 1 deletions
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17
src/libnm-platform/nm-linux-platform.c
View File

@@ -5828,7 +5828,22 @@ _nl_msg_new_route(uint16_t nlmsg_type, uint16_t nlmsg_flags, const NMPObject *ob
/* We currently don't have need for multi-hop routes... */
if (IS_IPv4) {
NLA_PUT(msg, RTA_GATEWAY, addr_len, &obj->ip4_route.gateway);
if (!obj->ip4_route.gateway && obj->ip4_route.via.addr_family) {
struct rtvia *rtvia;
rtvia = nla_data(nla_reserve(
msg,
RTA_VIA,
sizeof(*rtvia) + nm_utils_addr_family_to_size(obj->ip4_route.via.addr_family)));
if (!rtvia)
goto nla_put_failure;
rtvia->rtvia_family = obj->ip4_route.via.addr_family;
memcpy(rtvia->rtvia_addr,
obj->ip4_route.via.addr.addr_ptr,
nm_utils_addr_family_to_size(obj->ip4_route.via.addr_family));
} else {
NLA_PUT(msg, RTA_GATEWAY, addr_len, &obj->ip4_route.gateway);
}
} else {
if (!IN6_IS_ADDR_UNSPECIFIED(&obj->ip6_route.gateway))
NLA_PUT(msg, RTA_GATEWAY, addr_len, &obj->ip6_route.gateway);

14
src/libnm-platform/nm-platform.h
View File

@@ -443,6 +443,12 @@ struct _NMPlatformIP4Route {
* the first hop. */
in_addr_t gateway;
/* RTA_VIA. Part of the primary key for a route. Allows a gateway for a
* route to exist in a different address family.
* Only valid if: n_nexthops == 1, gateway == 0, via.family != 0
*/
NMIPAddrTyped via;
/* RTA_PREFSRC (called "src" by iproute2).
*
* pref_src is part of the ID of an IPv4 route. When deleting a route,
@@ -2404,6 +2410,14 @@ nm_platform_ip_route_get_gateway(int addr_family, const NMPlatformIPRoute *route
return &((NMPlatformIP6Route *) route)->gateway;
}
static inline const NMIPAddrTyped *
nm_platform_ip4_route_get_via(const NMPlatformIP4Route *route)
{
nm_assert(route);
return &route->via;
}
static inline gconstpointer
nm_platform_ip_route_get_pref_src(int addr_family, const NMPlatformIPRoute *route)
{