networkd: add support for [Address] sections

This will allow specifying more options per address than the
simple Address= entry in the [Network] section.

Preliminary support for the same functionality for [Route] sections
are added, but not yet hooked up, as more testing is needed.

man/systemd-networkd.service.xml

@@ -162,6 +162,23 @@
                                         .</para>
                                 </listitem>
                         </varlistentry>
+                </variablelist>
+
+                <para>The <literal>[Address]</literal> section accepts the following keys:</para>
+
+                <variablelist class='network-directives'>
+                        <varlistentry>
+                                <term><varname>Address</varname></term>
+                                <listitem>
+                                        <para>As in the <literal>[Network]</literal> section.</para>
+                                </listitem>
+                        </varlistentry>
+                        <varlistentry>
+                                <term><varname>Label</varname></term>
+                                <listitem>
+                                        <para>An address label.</para>
+                                </listitem>
+                        </varlistentry>
                </variablelist>
         </refsect1>
 

src/network/networkd-address.c

@@ -28,9 +28,20 @@
 #include "conf-parser.h"
 #include "net-util.h"
 
-int address_new(Network *network, Address **ret) {
+int address_new(Network *network, unsigned section, Address **ret) {
         _cleanup_address_free_ Address *address = NULL;
 
+        if (section) {
+                uint64_t key = section;
+                address = hashmap_get(network->addresses_by_section, &key);
+                if (address) {
+                        *ret = address;
+                        address = NULL;
+
+                        return 0;
+                }
+        }
+
         address = new0(Address, 1);
         if (!address)
                 return -ENOMEM;
@@ -39,6 +50,11 @@ int address_new(Network *network, Address **ret) {
 
         LIST_PREPEND(addresses, network->addresses, address);
 
+        if (section) {
+                address->section = section;
+                hashmap_put(network->addresses_by_section, &address->section, address);
+        }
+
         *ret = address;
         address = NULL;
 
@@ -51,7 +67,10 @@ void address_free(Address *address) {
 
         LIST_REMOVE(addresses, address->network->addresses, address);
 
-        free(address->label);
+        if (address->section)
+                hashmap_remove(address->network->addresses_by_section,
+                               &address->section);
+
         free(address);
 }
 
@@ -121,17 +140,19 @@ int config_parse_address(const char *unit,
                 const char *rvalue,
                 void *data,
                 void *userdata) {
+        Network *network = userdata;
         _cleanup_address_free_ Address *n = NULL;
         _cleanup_free_ char *address = NULL;
         const char *e;
         int r;
 
         assert(filename);
+        assert(section);
         assert(lvalue);
         assert(rvalue);
         assert(data);
 
-        r = address_new(userdata, &n);
+        r = address_new(network, section_line, &n);
         if (r < 0)
                 return r;
 
@@ -172,3 +193,54 @@ int config_parse_address(const char *unit,
 
         return 0;
 }
+
+int config_parse_label(const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        Network *network = userdata;
+        _cleanup_address_free_ Address *n = NULL;
+        _cleanup_free_ char *address = NULL;
+        char *label;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = address_new(network, section_line, &n);
+        if (r < 0)
+                return r;
+
+        label = strdup(rvalue);
+        if (!label)
+                return log_oom();
+
+        if (!ascii_is_valid(label) || strlen(label) >= IFNAMSIZ) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Interface label is not ASCII clean or is too"
+                           " long, ignoring assignment: %s", rvalue);
+                free(label);
+                return 0;
+        }
+
+        free(n->label);
+        if (*label)
+                n->label = label;
+        else {
+                free(label);
+                n->label = NULL;
+        }
+
+        n = NULL;
+
+        return 0;
+}

src/network/networkd-gperf.gperf

@@ -23,3 +23,5 @@ Match.Name,              config_parse_ifname,           0,       offsetof(Networ
 Network.Description,     config_parse_string,           0,       offsetof(Network, description)
 Network.Address,         config_parse_address,          0,       0
 Network.Gateway,         config_parse_gateway,          0,       0
+Address.Address,         config_parse_address,          0,       0
+Address.Label,           config_parse_label,            0,       0

src/network/networkd-network.c

@@ -45,8 +45,21 @@ static int network_load_one(Manager *manager, const char *filename) {
         network->manager = manager;
 
         LIST_HEAD_INIT(network->addresses);
+        LIST_HEAD_INIT(network->routes);
 
-        r = config_parse(NULL, filename, file, "Match\0Network\0", config_item_perf_lookup,
+        network->addresses_by_section = hashmap_new(uint64_hash_func, uint64_compare_func);
+        if (!network->addresses_by_section)
+                return log_oom();
+
+        network->routes_by_section = hashmap_new(uint64_hash_func, uint64_compare_func);
+        if (!network->routes_by_section)
+                return log_oom();
+
+        network->filename = strdup(filename);
+        if (!network->filename)
+                return log_oom();
+
+        r = config_parse(NULL, filename, file, "Match\0Network\0Address\0Route\0", config_item_perf_lookup,
                         (void*) network_gperf_lookup, false, false, network);
         if (r < 0) {
                 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
@@ -54,10 +67,6 @@ static int network_load_one(Manager *manager, const char *filename) {
         } else
                 log_debug("Parsed configuration file %s", filename);
 
-        network->filename = strdup(filename);
-        if (!network->filename)
-                return log_oom();
-
         LIST_PREPEND(networks, manager->networks, network);
         network = NULL;
 
@@ -121,6 +130,9 @@ void network_free(Network *network) {
         while ((address = network->addresses))
                 address_free(address);
 
+        hashmap_free(network->addresses_by_section);
+        hashmap_free(network->routes_by_section);
+
         LIST_REMOVE(networks, network->manager->networks, network);
 
         free(network);

src/network/networkd-route.c

@@ -28,9 +28,21 @@
 #include "conf-parser.h"
 #include "net-util.h"
 
-int route_new(Network *network, Route **ret) {
+int route_new(Network *network, unsigned section, Route **ret) {
         _cleanup_route_free_ Route *route = NULL;
 
+        if (section) {
+                uint64_t key = section;
+
+                route = hashmap_get(network->routes_by_section, &key);
+                if (route) {
+                        *ret = route;
+                        route = NULL;
+
+                        return 0;
+                }
+        }
+
         route = new0(Route, 1);
         if (!route)
                 return -ENOMEM;
@@ -39,6 +51,11 @@ int route_new(Network *network, Route **ret) {
 
         LIST_PREPEND(routes, network->routes, route);
 
+        if (section) {
+                route->section = section;
+                hashmap_put(network->routes_by_section, &route->section, route);
+        }
+
         *ret = route;
         route = NULL;
 
@@ -51,6 +68,10 @@ void route_free(Route *route) {
 
         LIST_REMOVE(routes, route->network->routes, route);
 
+        if (route->section)
+                hashmap_remove(route->network->routes_by_section,
+                               &route->section);
+
         free(route);
 }
 
@@ -65,9 +86,9 @@ int route_configure(Route *route, Link *link,
         assert(link->ifindex > 0);
         assert(route->family == AF_INET || route->family == AF_INET6);
 
-        r = sd_rtnl_message_route_new(RTM_NEWROUTE, route->family, 0, 0, 0,
+        r = sd_rtnl_message_route_new(RTM_NEWROUTE, route->family, route->dst_prefixlen,
-                                      RT_TABLE_MAIN, RT_SCOPE_UNIVERSE, RTPROT_BOOT,
+                                      0, 0, RT_TABLE_MAIN, RT_SCOPE_UNIVERSE,
-                                      RTN_UNICAST, 0, &req);
+                                      RTPROT_BOOT, RTN_UNICAST, 0, &req);
         if (r < 0) {
                 log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
                 return r;
@@ -79,6 +100,12 @@ int route_configure(Route *route, Link *link,
                 return r;
         }
 
+        r = sd_rtnl_message_append(req, RTA_DST, &route->dst_addr);
+        if (r < 0) {
+                log_error("Could not append RTA_DST attribute: %s", strerror(-r));
+                return r;
+        }
+
         r = sd_rtnl_message_append(req, RTA_OIF, &link->ifindex);
         if (r < 0) {
                 log_error("Could not append RTA_OIF attribute: %s", strerror(-r));
@@ -106,16 +133,18 @@ int config_parse_gateway(const char *unit,
                 const char *rvalue,
                 void *data,
                 void *userdata) {
+        Network *network = userdata;
         _cleanup_route_free_ Route *n = NULL;
         _cleanup_free_ char *route = NULL;
         int r;
 
         assert(filename);
+        assert(section);
         assert(lvalue);
         assert(rvalue);
         assert(data);
 
-        r = route_new(userdata, &n);
+        r = route_new(network, section_line, &n);
         if (r < 0)
                 return r;
 
@@ -130,3 +159,66 @@ int config_parse_gateway(const char *unit,
 
         return 0;
 }
+
+int config_parse_destination(const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        Network *network = userdata;
+        _cleanup_route_free_ Route *n = NULL;
+        _cleanup_free_ char *address = NULL;
+        const char *e;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = route_new(network, section_line, &n);
+        if (r < 0)
+                return r;
+
+        /* Destination=address/prefixlen */
+
+        /* prefixlen */
+        e = strchr(rvalue, '/');
+        if (e) {
+                unsigned i;
+                r = safe_atou(e + 1, &i);
+                if (r < 0) {
+                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                                   "Route destination prefix length is invalid, "
+                                   "ignoring assignment: %s", e + 1);
+                        return 0;
+                }
+
+                n->dst_prefixlen = (unsigned char) i;
+
+                address = strndup(rvalue, e - rvalue);
+                if (!address)
+                        return log_oom();
+        } else {
+                address = strdup(rvalue);
+                if (!address)
+                        return log_oom();
+        }
+
+        r = net_parse_inaddr(address, &n->family, &n->dst_addr);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Destination is invalid, ignoring assignment: %s", address);
+                return 0;
+        }
+
+        n = NULL;
+
+        return 0;
+}

src/network/networkd.h

@@ -54,11 +54,15 @@ struct Network {
         LIST_HEAD(Address, addresses);
         LIST_HEAD(Route, routes);
 
+        Hashmap *addresses_by_section;
+        Hashmap *routes_by_section;
+
         LIST_FIELDS(Network, networks);
 };
 
 struct Address {
         Network *network;
+        uint64_t section;
 
         unsigned char family;
         unsigned char prefixlen;
@@ -76,14 +80,21 @@ struct Address {
 
 struct Route {
         Network *network;
+        uint64_t section;
 
         unsigned char family;
+        unsigned char dst_prefixlen;
 
         union {
                 struct in_addr in;
                 struct in6_addr in6;
         } in_addr;
 
+        union {
+                struct in_addr in;
+                struct in6_addr in6;
+        } dst_addr;
+
         LIST_FIELDS(Route, routes);
 };
 
@@ -156,7 +167,7 @@ int network_apply(Manager *manager, Network *network, Link *link);
 const struct ConfigPerfItem* network_gperf_lookup(const char *key, unsigned length);
 
 /* Route */
-int route_new(Network *network, Route **ret);
+int route_new(Network *network, unsigned section, Route **ret);
 void route_free(Route *route);
 int route_configure(Route *route, Link *link, sd_rtnl_message_handler_t callback);
 
@@ -167,8 +178,12 @@ int config_parse_gateway(const char *unit, const char *filename, unsigned line,
                          const char *section, unsigned section_line, const char *lvalue,
                          int ltype, const char *rvalue, void *data, void *userdata);
 
+int config_parse_destination(const char *unit, const char *filename, unsigned line,
+                             const char *section, unsigned section_line, const char *lvalue,
+                             int ltype, const char *rvalue, void *data, void *userdata);
+
 /* Address */
-int address_new(Network *network, Address **ret);
+int address_new(Network *network, unsigned section, Address **ret);
 void address_free(Address *address);
 int address_configure(Address *address, Link *link, sd_rtnl_message_handler_t callback);
 
@@ -179,6 +194,10 @@ int config_parse_address(const char *unit, const char *filename, unsigned line,
                          const char *section, unsigned section_line, const char *lvalue,
                          int ltype, const char *rvalue, void *data, void *userdata);
 
+int config_parse_label(const char *unit, const char *filename, unsigned line,
+                       const char *section, unsigned section_line, const char *lvalue,
+                       int ltype, const char *rvalue, void *data, void *userdata);
+
 /* Link */
 
 int link_new(Manager *manager, struct udev_device *device, Link **ret);