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dhcp: set "src" for DHCPv4 routes

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Let's set the "src" (RTA_PREFSRC) of DHCP routes.
This helps with source address selection.

This can matter if the interface also has static addresses
configured.

Systemd-networkd also does this ([1], [2]).

[1] ac2dce5f36
[2] 5b89bff55f/src/network/networkd-dhcp4.c (L395)

Related: https://bugzilla.redhat.com/show_bug.cgi?id=1995372

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1173
This commit is contained in:
Thomas Haller
2022-04-01 08:39:56 +02:00
parent 7003b5eb70
commit 2dc7a3d9f9
4 changed files with 32 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
NEWS
View File

@@ -36,6 +36,8 @@ USE AT YOUR OWN RISK. NOT RECOMMENDED FOR PRODUCTION USE!
* nmcli: add connection migrate command to move a profile to a specified
settings plugin. This allows to convert profiles in the deprecated ifcfg-rh
format to keyfile.
* Set "src" attribute for routes from DHCPv4 to the leased address. This
helps with source address selection.
* Updated translations.
* Various bugfixes and internal improvements.

16
src/core/dhcp/nm-dhcp-nettools.c
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@@ -154,6 +154,7 @@ static gboolean
lease_parse_address(NDhcp4ClientLease *lease,
NML3ConfigData *l3cd,
GHashTable *options,
in_addr_t *out_address,
GError **error)
{
struct in_addr a_address;
@@ -268,6 +269,8 @@ lease_parse_address(NDhcp4ClientLease *lease,
.preferred = a_lifetime,
}));
NM_SET_OUT(out_address, a_address.s_addr);
return TRUE;
}
@@ -326,6 +329,7 @@ lease_parse_address_list(NDhcp4ClientLease *lease,
static void
lease_parse_routes(NDhcp4ClientLease *lease,
NML3ConfigData *l3cd,
in_addr_t lease_address,
GHashTable *options,
NMStrBuf *sbuf)
{
@@ -384,10 +388,11 @@ lease_parse_routes(NDhcp4ClientLease *lease,
nm_l3_config_data_add_route_4(l3cd,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.network = dest,
.plen = plen,
.gateway = gateway,
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.pref_src = lease_address,
.table_any = TRUE,
.table_coerced = 0,
.metric_any = TRUE,
@@ -427,10 +432,11 @@ lease_parse_routes(NDhcp4ClientLease *lease,
nm_l3_config_data_add_route_4(l3cd,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.network = dest,
.plen = plen,
.gateway = gateway,
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.pref_src = lease_address,
.table_any = TRUE,
.table_coerced = 0,
.metric_any = TRUE,
@@ -475,6 +481,7 @@ lease_parse_routes(NDhcp4ClientLease *lease,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.gateway = gateway,
.pref_src = lease_address,
.table_any = TRUE,
.table_coerced = 0,
.metric_any = TRUE,
@@ -558,6 +565,7 @@ lease_to_ip4_config(NMDedupMultiIndex *multi_idx,
const char *v_str;
guint16 v_u16;
in_addr_t v_inaddr;
in_addr_t lease_address;
struct in_addr v_inaddr_s;
int r;
@@ -567,7 +575,7 @@ lease_to_ip4_config(NMDedupMultiIndex *multi_idx,
options = nm_dhcp_option_create_options_dict();
if (!lease_parse_address(lease, l3cd, options, error))
if (!lease_parse_address(lease, l3cd, options, &lease_address, error))
return NULL;
r = n_dhcp4_client_lease_get_server_identifier(lease, &v_inaddr_s);
@@ -586,7 +594,7 @@ lease_to_ip4_config(NMDedupMultiIndex *multi_idx,
v_inaddr);
}
lease_parse_routes(lease, l3cd, options, &sbuf);
lease_parse_routes(lease, l3cd, lease_address, options, &sbuf);
lease_parse_address_list(lease, l3cd, NM_DHCP_OPTION_DHCP4_DOMAIN_NAME_SERVER, options, &sbuf);

4
src/core/dhcp/nm-dhcp-systemd.c
View File

@@ -293,10 +293,11 @@ lease_to_ip4_config(NMDedupMultiIndex *multi_idx,
nm_l3_config_data_add_route_4(l3cd,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.network = network_net,
.plen = r_plen,
.gateway = r_gateway.s_addr,
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.pref_src = a_address.s_addr,
.metric_any = TRUE,
.metric = m,
.table_any = TRUE,
@@ -347,6 +348,7 @@ lease_to_ip4_config(NMDedupMultiIndex *multi_idx,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.gateway = a_router[i].s_addr,
.pref_src = a_address.s_addr,
.table_any = TRUE,
.table_coerced = 0,
.metric_any = TRUE,

26
src/core/dhcp/nm-dhcp-utils.c
View File

@@ -28,7 +28,8 @@ static gboolean
ip4_process_dhcpcd_rfc3442_routes(const char *iface,
const char *str,
NML3ConfigData *l3cd,
guint32 *gwaddr)
in_addr_t address,
guint32 *out_gwaddr)
{
gs_free const char **routes = NULL;
const char **r;
@@ -79,7 +80,7 @@ ip4_process_dhcpcd_rfc3442_routes(const char *iface,
have_routes = TRUE;
if (rt_cidr == 0 && rt_addr == 0) {
/* FIXME: how to handle multiple routers? */
*gwaddr = rt_route;
*out_gwaddr = rt_route;
} else {
_LOG2I(LOGD_DHCP4,
iface,
@@ -91,13 +92,13 @@ ip4_process_dhcpcd_rfc3442_routes(const char *iface,
nm_l3_config_data_add_route_4(
l3cd,
&((const NMPlatformIP4Route){
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.network = nm_utils_ip4_address_clear_host_address(rt_addr, rt_cidr),
.plen = rt_cidr,
.gateway = rt_route,
.rt_source = NM_IP_CONFIG_SOURCE_DHCP,
.pref_src = address,
.metric_any = TRUE,
.table_any = TRUE,
}));
}
}
@@ -158,7 +159,8 @@ static gboolean
ip4_process_dhclient_rfc3442_routes(const char *iface,
const char *str,
NML3ConfigData *l3cd,
guint32 *gwaddr)
in_addr_t address,
guint32 *out_gwaddr)
{
gs_free const char **octets = NULL;
const char *const *o;
@@ -182,13 +184,14 @@ ip4_process_dhclient_rfc3442_routes(const char *iface,
have_routes = TRUE;
if (!route.plen) {
/* gateway passed as classless static route */
*gwaddr = route.gateway;
*out_gwaddr = route.gateway;
} else {
char b1[INET_ADDRSTRLEN];
char b2[INET_ADDRSTRLEN];
/* normal route */
route.rt_source = NM_IP_CONFIG_SOURCE_DHCP;
route.pref_src = address;
route.table_any = TRUE;
route.table_coerced = 0;
route.metric_any = TRUE;
@@ -212,14 +215,15 @@ static gboolean
ip4_process_classless_routes(const char *iface,
GHashTable *options,
NML3ConfigData *l3cd,
guint32 *gwaddr)
in_addr_t address,
guint32 *out_gwaddr)
{
const char *str, *p;
g_return_val_if_fail(options != NULL, FALSE);
g_return_val_if_fail(l3cd != NULL, FALSE);
*gwaddr = 0;
*out_gwaddr = 0;
/* dhcpd/dhclient in Fedora has support for rfc3442 implemented using a
* slightly different format:
@@ -266,10 +270,10 @@ ip4_process_classless_routes(const char *iface,
if (strchr(str, '/')) {
/* dhcpcd format */
return ip4_process_dhcpcd_rfc3442_routes(iface, str, l3cd, gwaddr);
return ip4_process_dhcpcd_rfc3442_routes(iface, str, l3cd, address, out_gwaddr);
}
return ip4_process_dhclient_rfc3442_routes(iface, str, l3cd, gwaddr);
return ip4_process_dhclient_rfc3442_routes(iface, str, l3cd, address, out_gwaddr);
}
static void
@@ -422,7 +426,7 @@ nm_dhcp_utils_ip4_config_from_options(NMDedupMultiIndex *multi_idx,
/* Routes: if the server returns classless static routes, we MUST ignore
* the 'static_routes' option.
*/
if (!ip4_process_classless_routes(iface, options, l3cd, &gateway))
if (!ip4_process_classless_routes(iface, options, l3cd, address.address, &gateway))
process_classful_routes(iface, options, l3cd);
if (gateway) {