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network: static routes via DHCP gateway
This makes Gateway= also take "DHCP". If "DHCP" is set, then the gateway address provided by DHCP or IPv6 RA is used. Closes #8213.
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0e97a910a6
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1985c54ff3
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@ -1216,7 +1216,9 @@
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<varlistentry>
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<term><varname>Gateway=</varname></term>
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<listitem>
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<para>As in the <literal>[Network]</literal> section.</para>
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<para>Takes the gateway address or special value <literal>dhcp</literal>. If
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<literal>dhcp</literal>, then the gateway address provided by DHCP (or in the IPv6 case,
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provided by IPv6 RA) is used.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -377,6 +377,23 @@ static int link_set_dhcp_routes(Link *link) {
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return log_link_error_errno(link, r, "Could not set router: %m");
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}
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Route *rt;
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LIST_FOREACH(routes, rt, link->network->static_routes) {
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if (!rt->gateway_from_dhcp)
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continue;
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if (rt->family != AF_INET)
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continue;
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rt->gw.in = router[0];
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r = route_configure(rt, link, dhcp4_route_handler);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set gateway: %m");
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if (r > 0)
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link->dhcp4_messages++;
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}
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return link_set_dns_routes(link, &address);
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}
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@ -480,6 +497,20 @@ static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_
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if (remove_all || !set_contains(link->dhcp_routes, route))
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(void) route_remove(route, link, NULL);
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Route *rt;
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LIST_FOREACH(routes, rt, link->network->static_routes) {
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if (!rt->gateway_from_dhcp)
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continue;
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if (rt->family != AF_INET)
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continue;
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if (!remove_all && in4_addr_equal(router, &rt->gw.in))
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continue;
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(void) route_remove(rt, link, NULL);
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}
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return 0;
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}
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@ -1039,6 +1039,8 @@ int link_request_set_routes(Link *link) {
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/* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
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for (phase = 0; phase < _PHASE_MAX; phase++)
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LIST_FOREACH(routes, rt, link->network->static_routes) {
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if (rt->gateway_from_dhcp)
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continue;
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if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
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continue;
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@ -169,6 +169,26 @@ static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
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if (r > 0)
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link->ndisc_messages++;
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Route *route_gw;
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LIST_FOREACH(routes, route_gw, link->network->static_routes) {
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if (!route_gw->gateway_from_dhcp)
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continue;
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if (route_gw->family != AF_INET6)
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continue;
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route_gw->gw = gateway;
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r = route_configure(route_gw, link, ndisc_netlink_route_message_handler);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not set gateway: %m");
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link_enter_failed(link);
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return r;
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}
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if (r > 0)
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link->ndisc_messages++;
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}
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return 0;
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}
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@ -998,10 +998,19 @@ int config_parse_gateway(
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/* we are not in an Route section, so treat
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* this as the special '0' section */
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r = route_new_static(network, NULL, 0, &n);
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} else
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if (r < 0)
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return r;
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} else {
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r = route_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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if (r < 0)
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return r;
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if (streq(rvalue, "dhcp")) {
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n->gateway_from_dhcp = true;
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TAKE_PTR(n);
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return 0;
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}
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}
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if (n->family == AF_UNSPEC)
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r = in_addr_from_string_auto(rvalue, &n->family, &n->gw);
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@ -48,6 +48,7 @@ struct Route {
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unsigned char pref;
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unsigned flags;
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int gateway_onlink;
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bool gateway_from_dhcp;
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union in_addr_union gw;
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union in_addr_union dst;
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