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https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-12-23 06:02:37 +01:00
ap: Refactor global address pool loading
Deprecate the global [General].APRanges setting in favour of [IPv4].APAddressPool with an extended (but backwards-compatible) syntax. Drop the existing address pool creation code. The new APAddressPool setting has the same syntax as the profile-local [IPv4].Address setting and the subnet selection code will fall back to the global setting if it's missing, this way we use common code to handle both settings.
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parent
c5d1a5c31f
commit
ff2840f95f
183
src/ap.c
183
src/ap.c
@ -97,7 +97,6 @@ struct ap_state {
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bool started : 1;
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bool gtk_set : 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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@ -128,99 +127,11 @@ struct ap_wsc_pbc_probe_record {
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uint64_t timestamp;
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};
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struct ap_ip_pool {
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uint32_t start;
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uint32_t end;
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uint8_t prefix;
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/* Fist/last valid subnet */
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uint8_t sub_start;
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uint8_t sub_end;
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struct l_uintset *used;
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};
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struct ap_ip_pool pool;
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static bool netconfig_enabled;
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static char **global_addr4_strs;
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static uint32_t netdev_watch;
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static struct l_netlink *rtnl;
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/*
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* Creates pool of IPs which AP intefaces can use. Each call to ip_pool_get
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* will advance the subnet +1 so there are no IP conflicts between AP
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* interfaces
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*/
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static bool ip_pool_create(const char *ip_prefix)
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{
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if (!util_ip_prefix_tohl(ip_prefix, &pool.prefix, &pool.start,
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&pool.end, NULL))
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return false;
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if (pool.prefix > 24) {
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l_error("APRanges prefix must 24 or less (%u used)",
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pool.prefix);
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memset(&pool, 0, sizeof(pool));
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return false;
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}
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/*
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* Find the number of subnets we can use, this will dictate the number
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* of AP interfaces that can be created (when using DHCP)
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*/
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pool.sub_start = (pool.start & 0x0000ff00) >> 8;
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pool.sub_end = (pool.end & 0x0000ff00) >> 8;
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pool.used = l_uintset_new_from_range(pool.sub_start, pool.sub_end);
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return true;
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}
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static char *ip_pool_get()
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{
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uint32_t ip;
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struct in_addr ia;
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uint8_t next_subnet = (uint8_t)l_uintset_find_unused_min(pool.used);
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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 0;
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l_uintset_put(pool.used, next_subnet);
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ip = pool.start;
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ip &= 0xffff00ff;
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ip |= (next_subnet << 8);
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ia.s_addr = htonl(ip);
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return l_strdup(inet_ntoa(ia));
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}
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static bool ip_pool_put(const char *address)
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{
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struct in_addr ia;
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uint32_t ip;
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uint8_t subnet;
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if (inet_aton(address, &ia) < 0)
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return false;
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ip = ntohl(ia.s_addr);
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subnet = (ip & 0x0000ff00) >> 8;
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if (subnet < pool.sub_start || subnet > pool.sub_end)
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return false;
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return l_uintset_take(pool.used, subnet);
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}
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static void ip_pool_destroy()
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{
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if (pool.used)
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l_uintset_free(pool.used);
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memset(&pool, 0, sizeof(pool));
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}
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static const char *broadcast_from_ip(const char *ip)
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{
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struct in_addr ia;
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@ -331,12 +242,6 @@ static void ap_reset(struct ap_state *ap)
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ap->netconfig_set_addr4 = false;
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}
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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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@ -2511,7 +2416,6 @@ static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
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int ret;
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struct in_addr ia;
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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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@ -2552,27 +2456,11 @@ static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
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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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prefix_len = AP_DEFAULT_IPV4_PREFIX_LEN;
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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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ret = ip_pool_select_addr4((const char **) global_addr4_strs,
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prefix_len, &new_addr);
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}
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if (ret)
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@ -2631,7 +2519,6 @@ static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
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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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@ -2663,7 +2550,7 @@ static int ap_load_ipv4(struct ap_state *ap, const struct l_settings *config)
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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") || !pool.used)
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if (!l_settings_has_group(config, "IPv4") || !netconfig_enabled)
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return 0;
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if (l_settings_has_key(config, "IPv4", "Address")) {
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@ -3652,7 +3539,6 @@ static void ap_netdev_watch(struct netdev *netdev,
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static int ap_init(void)
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{
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const struct l_settings *settings = iwd_get_config();
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bool dhcp_enable;
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netdev_watch = netdev_watch_add(ap_netdev_watch, NULL, NULL);
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@ -3663,31 +3549,44 @@ static int ap_init(void)
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ap_diagnostic_interface_destroy, false);
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/*
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* Reusing [General].EnableNetworkConfiguration as a switch to enable
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* DHCP server. If no value is found or it is false do not create a
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* DHCP server.
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* Enable network configuration and DHCP only if
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* [General].EnableNetworkConfiguration is true.
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*/
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if (!l_settings_get_bool(settings, "General",
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"EnableNetworkConfiguration", &dhcp_enable))
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dhcp_enable = false;
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"EnableNetworkConfiguration",
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&netconfig_enabled))
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netconfig_enabled = false;
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if (dhcp_enable) {
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L_AUTO_FREE_VAR(char *, ip_prefix);
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ip_prefix = l_settings_get_string(settings, "General",
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"APRanges");
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/*
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* In this case its assumed the user only cares about station
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* netconfig so we let ap_init pass but DHCP will not be
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* enabled.
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*/
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if (!ip_prefix) {
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l_warn("[General].APRanges must be set for DHCP");
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return 0;
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if (netconfig_enabled) {
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if (l_settings_get_value(settings, "IPv4", "APAddressPool")) {
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global_addr4_strs = l_settings_get_string_list(settings,
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"IPv4",
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"APAddressPool",
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',');
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if (!global_addr4_strs || !*global_addr4_strs) {
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l_error("Can't parse the [IPv4].APAddressPool "
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"setting as a string list");
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l_strv_free(global_addr4_strs);
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global_addr4_strs = NULL;
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}
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} else if (l_settings_get_value(settings,
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"General", "APRanges")) {
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global_addr4_strs = l_settings_get_string_list(settings,
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"General",
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"APRanges",
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',');
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if (!global_addr4_strs || !*global_addr4_strs) {
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l_error("Can't parse the [General].APRanges "
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"setting as a string list");
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l_strv_free(global_addr4_strs);
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global_addr4_strs = NULL;
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}
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}
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if (!ip_pool_create(ip_prefix))
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return -EINVAL;
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/* Fall back to 192.168.0.0/16 */
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if (!global_addr4_strs)
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global_addr4_strs =
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l_strv_append(NULL, "192.168.0.0/16");
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}
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rtnl = iwd_get_rtnl();
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@ -3700,7 +3599,7 @@ static void ap_exit(void)
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netdev_watch_remove(netdev_watch);
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l_dbus_unregister_interface(dbus_get_bus(), IWD_AP_INTERFACE);
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ip_pool_destroy();
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l_strv_free(global_addr4_strs);
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}
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IWD_MODULE(ap, ap_init, ap_exit)
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