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https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2025-01-08 15:52:32 +01:00
ap: Refactor DHCP settings loading
Extend the [IPv4].Address setting's syntax to allow a new format: a list of <IP>/<prefix_len> -form strings that define the address space from which a subnet is selected. Rewrite the DHCP settings loading with other notable changes: * validate some of the settings more thoroughly, * name all netconfig-related ap_state members with the netconfig_ prefix, * make sure we always call l_dhcp_server_set_netmask(), * allow netmasks other than 24-bit and change the default to 28 bits, * as requested avoid using the l_net_ ioctl-based functions although l_dhcp still uses them internally, * as requested avoid touching the ap_state members until the end of some functions so that on error they're basically a no-op (for readability).
This commit is contained in:
Andrew Zaborowski
Denis Kenzior
parent
e56e4ade90
commit
c5d1a5c31f
503
src/ap.c
503
src/ap.c
@ -52,6 +52,7 @@
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#include "src/frame-xchg.h"
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#include "src/wscutil.h"
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#include "src/eap-wsc.h"
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#include "src/ip-pool.h"
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#include "src/ap.h"
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#include "src/storage.h"
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#include "src/diagnostic.h"
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@ -88,15 +89,15 @@ struct ap_state {
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uint16_t last_aid;
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struct l_queue *sta_states;
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struct l_dhcp_server *server;
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struct l_dhcp_server *netconfig_dhcp;
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char *netconfig_addr4_str;
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uint8_t netconfig_prefix_len4;
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uint32_t rtnl_add_cmd;
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char *own_ip;
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unsigned int ip_prefix;
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bool started : 1;
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bool gtk_set : 1;
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bool cleanup_ip : 1;
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bool use_ip_pool : 1;
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bool netconfig_set_addr4 : 1;
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bool netconfig_use_ip_pool : 1;
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};
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struct sta_state {
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@ -181,7 +182,7 @@ static char *ip_pool_get()
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/* This shouldn't happen */
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if (next_subnet < pool.sub_start || next_subnet > pool.sub_end)
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return NULL;
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return 0;
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l_uintset_put(pool.used, next_subnet);
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@ -321,23 +322,27 @@ static void ap_reset(struct ap_state *ap)
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ap->started = false;
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/* Delete IP if one was set by IWD */
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if (ap->cleanup_ip)
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if (ap->netconfig_set_addr4) {
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l_rtnl_ifaddr4_delete(rtnl, netdev_get_ifindex(netdev),
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ap->ip_prefix, ap->own_ip,
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broadcast_from_ip(ap->own_ip),
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NULL, NULL, NULL);
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if (ap->own_ip) {
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/* Release IP from pool if used */
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if (ap->use_ip_pool)
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ip_pool_put(ap->own_ip);
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l_free(ap->own_ip);
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ap->netconfig_prefix_len4,
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ap->netconfig_addr4_str,
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broadcast_from_ip(ap->netconfig_addr4_str),
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NULL, NULL, NULL);
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ap->netconfig_set_addr4 = false;
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}
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if (ap->server) {
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l_dhcp_server_destroy(ap->server);
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ap->server = NULL;
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if (ap->netconfig_use_ip_pool) {
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/* Release IP from pool if used */
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ip_pool_put(ap->netconfig_addr4_str);
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ap->netconfig_use_ip_pool = false;
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}
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l_free(ap->netconfig_addr4_str);
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ap->netconfig_addr4_str = NULL;
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if (ap->netconfig_dhcp) {
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l_dhcp_server_destroy(ap->netconfig_dhcp);
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ap->netconfig_dhcp = NULL;
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}
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}
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@ -2165,7 +2170,7 @@ static void ap_start_cb(struct l_genl_msg *msg, void *user_data)
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goto failed;
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}
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if (ap->server && !l_dhcp_server_start(ap->server)) {
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if (ap->netconfig_dhcp && !l_dhcp_server_start(ap->netconfig_dhcp)) {
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l_error("DHCP server failed to start");
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goto failed;
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}
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@ -2492,182 +2497,290 @@ static void ap_mlme_notify(struct l_genl_msg *msg, void *user_data)
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}
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}
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static bool dhcp_load_settings(struct ap_state *ap,
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const struct l_settings *settings)
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{
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struct l_dhcp_server *server = ap->server;
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struct in_addr ia;
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#define AP_DEFAULT_IPV4_PREFIX_LEN 28
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L_AUTO_FREE_VAR(char *, netmask) = l_settings_get_string(settings,
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"IPv4", "Netmask");
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L_AUTO_FREE_VAR(char *, gateway) = l_settings_get_string(settings,
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"IPv4", "Gateway");
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char **dns = l_settings_get_string_list(settings, "IPv4",
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"DNSList", ',');
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char **ip_range = l_settings_get_string_list(settings, "IPv4",
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"IPRange", ',');
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unsigned int lease_time;
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bool ret = false;
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if (!l_settings_get_uint(settings, "IPv4", "LeaseTime", &lease_time))
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lease_time = 0;
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if (gateway && !l_dhcp_server_set_gateway(server, gateway)) {
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l_error("[IPv4].Gateway value error");
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goto error;
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}
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if (dns && !l_dhcp_server_set_dns(server, dns)) {
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l_error("[IPv4].DNSList value error");
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goto error;
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}
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if (netmask && !l_dhcp_server_set_netmask(server, netmask)) {
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l_error("[IPv4].Netmask value error");
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goto error;
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}
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if (ip_range) {
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if (l_strv_length(ip_range) != 2) {
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l_error("Two addresses expected in [IPv4].IPRange");
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goto error;
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}
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if (!l_dhcp_server_set_ip_range(server, ip_range[0],
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ip_range[1])) {
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l_error("Error setting IP range from [IPv4].IPRange");
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goto error;
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}
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}
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if (lease_time && !l_dhcp_server_set_lease_time(server, lease_time)) {
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l_error("[IPv4].LeaseTime value error");
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goto error;
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}
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if (netmask && inet_pton(AF_INET, netmask, &ia) > 0)
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ap->ip_prefix = __builtin_popcountl(ia.s_addr);
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else
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ap->ip_prefix = 24;
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ret = true;
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error:
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l_strv_free(dns);
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l_strv_free(ip_range);
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return ret;
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}
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/*
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* This will determine the IP being used for DHCP. The IP will be automatically
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* set to ap->own_ip.
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*
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* The address to set (or keep) is determined in this order:
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* 1. Address defined in provisioning file
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* 2. Address already set on interface
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* 3. Address in IP pool.
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*
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* Returns: 0 if an IP was successfully selected and needs to be set
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* -EALREADY if an IP was already set on the interface or
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* IP configuration was not enabled,
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* -EEXIST if the IP pool ran out of IP's
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* -EINVAL if there was an error.
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*/
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static int ap_setup_dhcp(struct ap_state *ap, const struct l_settings *settings)
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static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
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uint8_t prefix_len, const char *gateway_str,
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const char **ip_range,
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const char **dns_str_list,
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unsigned int lease_time)
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{
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uint32_t ifindex = netdev_get_ifindex(ap->netdev);
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struct l_rtnl_address *existing_addr = ip_pool_get_addr4(ifindex);
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struct l_rtnl_address *new_addr = NULL;
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int ret;
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struct in_addr ia;
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uint32_t address = 0;
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L_AUTO_FREE_VAR(char *, addr) = NULL;
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int ret = -EINVAL;
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struct l_dhcp_server *dhcp = NULL;
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bool use_ip_pool = false;
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bool r;
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char addr_str_buf[INET_ADDRSTRLEN];
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/* get the current address if there is one */
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if (l_net_get_address(ifindex, &ia) && ia.s_addr != 0)
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address = ia.s_addr;
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addr = l_settings_get_string(settings, "IPv4", "Address");
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if (addr) {
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if (inet_pton(AF_INET, addr, &ia) < 0)
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return -EINVAL;
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/* Is a matching address already set on interface? */
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if (ia.s_addr == address)
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ret = -EALREADY;
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else
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ret = 0;
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} else if (address) {
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/* No address in config, but interface has one set */
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addr = l_strdup(inet_ntoa(ia));
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ret = -EALREADY;
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} else if (pool.used) {
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/* No config file, no address set. Use IP pool */
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addr = ip_pool_get();
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if (!addr) {
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l_error("No more IP's in pool, cannot start AP on %u",
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ifindex);
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return -EEXIST;
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}
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ap->use_ip_pool = true;
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ap->ip_prefix = pool.prefix;
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ret = 0;
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} else
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return -EALREADY;
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ap->server = l_dhcp_server_new(ifindex);
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if (!ap->server) {
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l_error("Failed to create DHCP server on %u", ifindex);
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return -EINVAL;
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dhcp = l_dhcp_server_new(ifindex);
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if (!dhcp) {
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l_error("Failed to create DHCP server on ifindex %u", ifindex);
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ret = -EIO;
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goto cleanup;
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}
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if (getenv("IWD_DHCP_DEBUG"))
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l_dhcp_server_set_debug(ap->server, do_debug,
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"[DHCPv4 SERV] ", NULL);
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l_dhcp_server_set_debug(dhcp, do_debug,
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"[DHCPv4 SERV] ", NULL);
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/* Set the remaining DHCP options in config file */
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if (!dhcp_load_settings(ap, settings))
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return -EINVAL;
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/*
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* The address pool specified for this AP (if any) has the priority,
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* next is the address currently set on the interface (if any) and
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* last is the global AP address pool (APRanges setting).
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*/
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if (addr_str_list) {
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if (!prefix_len)
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prefix_len = AP_DEFAULT_IPV4_PREFIX_LEN;
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if (!l_dhcp_server_set_ip_address(ap->server, addr))
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return -EINVAL;
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ret = ip_pool_select_addr4(addr_str_list, prefix_len,
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&new_addr);
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} else if (existing_addr &&
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l_rtnl_address_get_prefix_length(existing_addr) <
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31) {
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if (!prefix_len)
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prefix_len = l_rtnl_address_get_prefix_length(
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existing_addr);
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ap->own_ip = l_steal_ptr(addr);
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if (!l_rtnl_address_get_address(existing_addr, addr_str_buf)) {
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ret = -EIO;
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goto cleanup;
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}
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new_addr = l_rtnl_address_new(addr_str_buf, prefix_len);
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ret = 0;
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} else {
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L_AUTO_FREE_VAR(char *, addr_str) = NULL;
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if (prefix_len) {
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l_error("[IPv4].Netmask can't be used without an "
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"address");
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ret = -EINVAL;
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goto cleanup;
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}
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/* No config, no address set. Use IP pool */
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addr_str = ip_pool_get();
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if (addr_str) {
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use_ip_pool = true;
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prefix_len = pool.prefix;
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new_addr = l_rtnl_address_new(addr_str, prefix_len);
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ret = 0;
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} else {
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l_error("No more IP's in pool, cannot start AP on %u",
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ifindex);
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ret = -EEXIST;
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}
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}
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if (ret)
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goto cleanup;
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ret = -EIO;
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/*
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* l_dhcp_server_start() would retrieve the current IPv4 from
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* the interface but set it anyway in case there are multiple
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* addresses, saves one ioctl too.
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*/
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if (!l_rtnl_address_get_address(new_addr, addr_str_buf)) {
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l_error("l_rtnl_address_get_address failed");
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goto cleanup;
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}
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if (!l_dhcp_server_set_ip_address(dhcp, addr_str_buf)) {
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l_error("l_dhcp_server_set_ip_address failed");
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goto cleanup;
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}
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ia.s_addr = htonl(util_netmask_from_prefix(prefix_len));
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if (!l_dhcp_server_set_netmask(dhcp, inet_ntoa(ia))) {
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l_error("l_dhcp_server_set_netmask failed");
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goto cleanup;
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}
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if (gateway_str && !l_dhcp_server_set_gateway(dhcp, gateway_str)) {
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l_error("l_dhcp_server_set_gateway failed");
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goto cleanup;
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}
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if (ip_range) {
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r = l_dhcp_server_set_ip_range(dhcp, ip_range[0], ip_range[1]);
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if (!r) {
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l_error("l_dhcp_server_set_ip_range failed");
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goto cleanup;
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}
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}
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if (dns_str_list) {
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r = l_dhcp_server_set_dns(dhcp, (char **) dns_str_list);
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if (!r) {
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l_error("l_dhcp_server_set_dns failed");
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goto cleanup;
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}
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}
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if (lease_time && !l_dhcp_server_set_lease_time(dhcp, lease_time)) {
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l_error("l_dhcp_server_set_lease_time failed");
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goto cleanup;
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}
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ap->netconfig_addr4_str = l_strdup(addr_str_buf);
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ap->netconfig_prefix_len4 = prefix_len;
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ap->netconfig_set_addr4 = true;
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ap->netconfig_use_ip_pool = use_ip_pool;
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ap->netconfig_dhcp = l_steal_ptr(dhcp);
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ret = 0;
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if (existing_addr && l_rtnl_address_get_prefix_length(existing_addr) >
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prefix_len) {
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char addr_str_buf2[INET_ADDRSTRLEN];
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if (l_rtnl_address_get_address(existing_addr, addr_str_buf2) &&
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!strcmp(addr_str_buf, addr_str_buf2))
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ap->netconfig_set_addr4 = false;
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}
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cleanup:
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l_dhcp_server_destroy(dhcp);
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l_rtnl_address_free(new_addr);
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l_rtnl_address_free(existing_addr);
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return ret;
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}
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static int ap_load_dhcp(struct ap_state *ap, const struct l_settings *config,
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bool *wait_dhcp)
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static int ap_load_ipv4(struct ap_state *ap, const struct l_settings *config)
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{
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uint32_t ifindex = netdev_get_ifindex(ap->netdev);
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int err = -EINVAL;
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int ret = -EINVAL;
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char **addr_str_list = NULL;
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uint32_t static_addr = 0;
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uint8_t prefix_len = 0;
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char *gateway_str = NULL;
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char **ip_range = NULL;
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char **dns_str_list = NULL;
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unsigned int lease_time = 0;
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struct in_addr ia;
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if (!l_settings_has_group(config, "IPv4"))
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if (!l_settings_has_group(config, "IPv4") || !pool.used)
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return 0;
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err = ap_setup_dhcp(ap, config);
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if (err == 0) {
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/* Address change required */
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ap->rtnl_add_cmd = l_rtnl_ifaddr4_add(rtnl, ifindex,
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ap->ip_prefix, ap->own_ip,
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broadcast_from_ip(ap->own_ip),
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ap_ifaddr4_added_cb, ap, NULL);
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if (!ap->rtnl_add_cmd) {
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l_error("Failed to add IPv4 address");
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return -EIO;
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if (l_settings_has_key(config, "IPv4", "Address")) {
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addr_str_list = l_settings_get_string_list(config, "IPv4",
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"Address", ',');
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if (!addr_str_list || !*addr_str_list) {
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l_error("Can't parse the profile [IPv4].Address "
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"setting as a string list");
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goto done;
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}
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ap->cleanup_ip = true;
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*wait_dhcp = true;
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err = 0;
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/* Selected address already set, continue normally */
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} else if (err == -EALREADY) {
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*wait_dhcp = false;
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err = 0;
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/* Check for the static IP syntax: Address=<IP> */
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if (l_strv_length(addr_str_list) == 1 &&
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inet_pton(AF_INET, *addr_str_list, &ia) == 1)
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static_addr = ntohl(ia.s_addr);
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}
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return err;
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if (l_settings_has_key(config, "IPv4", "Netmask")) {
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L_AUTO_FREE_VAR(char *, netmask_str) =
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l_settings_get_string(config, "IPv4", "Netmask");
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if (inet_pton(AF_INET, netmask_str, &ia) != 1) {
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l_error("Can't parse the profile [IPv4].Netmask "
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"setting");
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goto done;
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}
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prefix_len = __builtin_popcount(ia.s_addr);
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if (ntohl(ia.s_addr) != util_netmask_from_prefix(prefix_len)) {
|
||||
l_error("Invalid profile [IPv4].Netmask value");
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
if (l_settings_has_key(config, "IPv4", "Gateway")) {
|
||||
gateway_str = l_settings_get_string(config, "IPv4", "Gateway");
|
||||
if (!gateway_str) {
|
||||
l_error("Invalid profile [IPv4].Gateway value");
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
if (l_settings_get_value(config, "IPv4", "IPRange")) {
|
||||
int i;
|
||||
uint32_t netmask;
|
||||
uint8_t tmp_len = prefix_len ?: AP_DEFAULT_IPV4_PREFIX_LEN;
|
||||
|
||||
ip_range = l_settings_get_string_list(config, "IPv4",
|
||||
"IPRange", ',');
|
||||
|
||||
if (!static_addr) {
|
||||
l_error("[IPv4].IPRange only makes sense in an AP "
|
||||
"profile if a static local address has also "
|
||||
"been specified");
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (!ip_range || l_strv_length(ip_range) != 2) {
|
||||
l_error("Can't parse the profile [IPv4].IPRange "
|
||||
"setting as two address strings");
|
||||
goto done;
|
||||
}
|
||||
|
||||
netmask = util_netmask_from_prefix(tmp_len);
|
||||
|
||||
for (i = 0; i < 2; i++) {
|
||||
struct in_addr range_addr;
|
||||
|
||||
if (inet_aton(ip_range[i], &range_addr) != 1) {
|
||||
l_error("Can't parse address in "
|
||||
"[IPv4].IPRange[%i]", i + 1);
|
||||
goto done;
|
||||
}
|
||||
|
||||
if ((static_addr ^ ntohl(range_addr.s_addr)) &
|
||||
netmask) {
|
||||
ia.s_addr = htonl(static_addr);
|
||||
l_error("[IPv4].IPRange[%i] is not in the "
|
||||
"%s/%i subnet", i + 1, inet_ntoa(ia),
|
||||
tmp_len);
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (l_settings_has_key(config, "IPv4", "DNSList")) {
|
||||
dns_str_list = l_settings_get_string_list(config, "IPv4",
|
||||
"DNSList", ',');
|
||||
if (!dns_str_list || !*dns_str_list) {
|
||||
l_error("Can't parse the profile [IPv4].DNSList "
|
||||
"setting as a string list");
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
if (l_settings_has_key(config, "IPv4", "LeaseTime")) {
|
||||
if (!l_settings_get_uint(config, "IPv4", "LeaseTime",
|
||||
&lease_time) ||
|
||||
lease_time < 1) {
|
||||
l_error("Error parsing [IPv4].LeaseTime as a positive "
|
||||
"integer");
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
ret = ap_setup_netconfig4(ap, (const char **) addr_str_list, prefix_len,
|
||||
gateway_str, (const char **) ip_range,
|
||||
(const char **) dns_str_list,
|
||||
lease_time);
|
||||
|
||||
done:
|
||||
l_strv_free(addr_str_list);
|
||||
l_free(gateway_str);
|
||||
l_strv_free(ip_range);
|
||||
l_strv_free(dns_str_list);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static bool ap_load_psk(struct ap_state *ap, const struct l_settings *config)
|
||||
@ -2722,7 +2835,7 @@ static bool ap_load_psk(struct ap_state *ap, const struct l_settings *config)
|
||||
}
|
||||
|
||||
static int ap_load_config(struct ap_state *ap, const struct l_settings *config,
|
||||
bool *out_wait_dhcp, bool *out_cck_rates)
|
||||
bool *out_cck_rates)
|
||||
{
|
||||
size_t len;
|
||||
L_AUTO_FREE_VAR(char *, strval) = NULL;
|
||||
@ -2748,11 +2861,12 @@ static int ap_load_config(struct ap_state *ap, const struct l_settings *config,
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* This loads DHCP settings either from the l_settings object or uses
|
||||
* the defaults. wait_on_address will be set true if an address change
|
||||
* is required.
|
||||
* This looks at the network configuration settings in @config and
|
||||
* relevant global settings and if it determines that netconfig is to
|
||||
* be enabled for the AP, it both creates the DHCP server object and
|
||||
* processes IP settings, applying the defaults where needed.
|
||||
*/
|
||||
err = ap_load_dhcp(ap, config, out_wait_dhcp);
|
||||
err = ap_load_ipv4(ap, config);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
@ -2868,15 +2982,15 @@ struct ap_state *ap_start(struct netdev *netdev, struct l_settings *config,
|
||||
struct ap_state *ap;
|
||||
struct wiphy *wiphy = netdev_get_wiphy(netdev);
|
||||
uint64_t wdev_id = netdev_get_wdev_id(netdev);
|
||||
int err = -EINVAL;
|
||||
bool wait_on_address = false;
|
||||
int err;
|
||||
bool cck_rates = true;
|
||||
|
||||
if (err_out)
|
||||
*err_out = err;
|
||||
if (L_WARN_ON(!config)) {
|
||||
if (err_out)
|
||||
*err_out = -EINVAL;
|
||||
|
||||
if (L_WARN_ON(!config))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ap = l_new(struct ap_state, 1);
|
||||
ap->nl80211 = l_genl_family_new(iwd_get_genl(), NL80211_GENL_NAME);
|
||||
@ -2884,7 +2998,7 @@ struct ap_state *ap_start(struct netdev *netdev, struct l_settings *config,
|
||||
ap->ops = ops;
|
||||
ap->user_data = user_data;
|
||||
|
||||
err = ap_load_config(ap, config, &wait_on_address, &cck_rates);
|
||||
err = ap_load_config(ap, config, &cck_rates);
|
||||
if (err)
|
||||
goto error;
|
||||
|
||||
@ -2950,9 +3064,20 @@ struct ap_state *ap_start(struct netdev *netdev, struct l_settings *config,
|
||||
if (!ap->mlme_watch)
|
||||
l_error("Registering for MLME notification failed");
|
||||
|
||||
if (wait_on_address) {
|
||||
if (err_out)
|
||||
*err_out = 0;
|
||||
if (ap->netconfig_set_addr4) {
|
||||
const char *broadcast_str =
|
||||
broadcast_from_ip(ap->netconfig_addr4_str);
|
||||
|
||||
ap->rtnl_add_cmd = l_rtnl_ifaddr4_add(rtnl,
|
||||
netdev_get_ifindex(netdev),
|
||||
ap->netconfig_prefix_len4,
|
||||
ap->netconfig_addr4_str,
|
||||
broadcast_str,
|
||||
ap_ifaddr4_added_cb, ap, NULL);
|
||||
if (!ap->rtnl_add_cmd) {
|
||||
l_error("Failed to add the IPv4 address");
|
||||
goto error;
|
||||
}
|
||||
|
||||
return ap;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user