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netconfig: Start RA & DHCPv6 clients
For now the RA client is ran automatically when DHCPv6 client starts. RA takes care of installing / deleting prefix routes and installing the default gateway. If Router Advertisements indicate support DHCPv6, then DHCPv6 transactions are kicked off and the address is set / removed automatically. Stateless configuration is not yet supported.
This commit is contained in:
Denis Kenzior
parent
8d76cae6b1
commit
bb876953ac
138
src/netconfig.c
138
src/netconfig.c
@ -30,6 +30,12 @@
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#include <linux/rtnetlink.h>
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#include <limits.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <ell/ell.h>
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@ -45,6 +51,7 @@
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struct netconfig {
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uint32_t ifindex;
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struct l_dhcp_client *dhcp_client;
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struct l_dhcp6_client *dhcp6_client;
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struct l_queue *ifaddr_list;
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uint8_t rtm_protocol;
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uint8_t rtm_v6_protocol;
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@ -80,6 +87,38 @@ static void do_debug(const char *str, void *user_data)
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l_info("%s%s", prefix, str);
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}
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static int write_string(const char *file, const char *value)
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{
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size_t l = strlen(value);
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int fd;
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int r;
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fd = L_TFR(open(file, O_WRONLY));
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if (fd < 0)
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return -errno;
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r = L_TFR(write(fd, value, l));
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L_TFR(close(fd));
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return r;
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}
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static int sysfs_write_ipv6_setting(const char *ifname, const char *setting,
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const char *value)
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{
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int r;
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L_AUTO_FREE_VAR(char *, file) =
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l_strdup_printf("/proc/sys/net/ipv6/conf/%s/%s",
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ifname, setting);
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r = write_string(file, value);
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if (r < 0)
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l_error("Unable to write %s to %s", setting, file);
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return r;
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}
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static void netconfig_ifaddr_destroy(void *data)
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{
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struct netconfig_ifaddr *ifaddr = data;
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@ -95,6 +134,7 @@ static void netconfig_free(void *data)
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struct netconfig *netconfig = data;
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l_dhcp_client_destroy(netconfig->dhcp_client);
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l_dhcp6_client_destroy(netconfig->dhcp6_client);
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l_queue_destroy(netconfig->ifaddr_list, netconfig_ifaddr_destroy);
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@ -582,6 +622,10 @@ static void netconfig_ifaddr_ipv6_added(struct netconfig *netconfig,
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uint32_t len)
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{
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struct netconfig_ifaddr *ifaddr;
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struct in6_addr in6;
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if (ifa->ifa_flags & IFA_F_TENTATIVE)
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return;
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ifaddr = l_new(struct netconfig_ifaddr, 1);
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ifaddr->family = ifa->ifa_family;
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@ -593,6 +637,22 @@ static void netconfig_ifaddr_ipv6_added(struct netconfig *netconfig,
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ifaddr->prefix_len);
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l_queue_push_tail(netconfig->ifaddr_list, ifaddr);
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if (netconfig->rtm_v6_protocol != RTPROT_DHCP)
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return;
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inet_pton(AF_INET6, ifaddr->ip, &in6);
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if (!IN6_IS_ADDR_LINKLOCAL(&in6))
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return;
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l_dhcp6_client_set_link_local_address(netconfig->dhcp6_client,
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ifaddr->ip);
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if (l_dhcp6_client_start(netconfig->dhcp6_client))
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return;
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l_error("netconfig: Failed to start DHCPv6 client for "
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"interface %u", netconfig->ifindex);
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}
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static void netconfig_ifaddr_ipv6_deleted(struct netconfig *netconfig,
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@ -998,19 +1058,25 @@ static void netconfig_ipv4_dhcp_event_handler(struct l_dhcp_client *client,
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}
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}
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static bool netconfig_ipv4_dhcp_create(struct netconfig *netconfig)
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static void netconfig_dhcp6_event_handler(struct l_dhcp6_client *client,
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enum l_dhcp6_client_event event,
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void *userdata)
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{
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netconfig->dhcp_client = l_dhcp_client_new(netconfig->ifindex);
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struct netconfig *netconfig = userdata;
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l_dhcp_client_set_event_handler(netconfig->dhcp_client,
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netconfig_ipv4_dhcp_event_handler,
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netconfig, NULL);
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if (getenv("IWD_DHCP_DEBUG"))
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l_dhcp_client_set_debug(netconfig->dhcp_client, do_debug,
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"[DHCPv4] ", NULL);
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return true;
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switch (event) {
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case L_DHCP6_CLIENT_EVENT_IP_CHANGED:
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case L_DHCP6_CLIENT_EVENT_LEASE_OBTAINED:
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case L_DHCP6_CLIENT_EVENT_LEASE_RENEWED:
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break;
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case L_DHCP6_CLIENT_EVENT_LEASE_EXPIRED:
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l_debug("Lease for interface %u expired", netconfig->ifindex);
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break;
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case L_DHCP6_CLIENT_EVENT_NO_LEASE:
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l_error("netconfig: Failed to obtain DHCPv6 lease "
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"for interface %u", netconfig->ifindex);
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break;
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}
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}
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static void netconfig_ipv4_select_and_install(struct netconfig *netconfig)
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@ -1061,17 +1127,7 @@ static void netconfig_ipv6_select_and_install(struct netconfig *netconfig)
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return;
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}
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/*
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* TODO
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*
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* netconfig->rtm_v6_protocol = RTPROT_DHCP;
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*
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* if (l_dhcp_v6_client_start(netconfig->l_dhcp_v6_client))
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* return;
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*
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* l_error("netconfig: Failed to start DHCPv6 client for "
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* "interface %u", netconfig->ifindex);
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*/
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netconfig->rtm_v6_protocol = RTPROT_DHCP;
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}
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static void netconfig_ipv6_select_and_uninstall(struct netconfig *netconfig)
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@ -1079,6 +1135,8 @@ static void netconfig_ipv6_select_and_uninstall(struct netconfig *netconfig)
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struct netconfig_ifaddr *ifaddr;
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char *gateway;
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l_dhcp6_client_stop(netconfig->dhcp6_client);
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ifaddr = netconfig_ipv6_get_ifaddr(netconfig,
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netconfig->rtm_v6_protocol);
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if (ifaddr) {
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@ -1086,11 +1144,6 @@ static void netconfig_ipv6_select_and_uninstall(struct netconfig *netconfig)
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netconfig_ifaddr_destroy(ifaddr);
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}
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/*
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* TODO
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* l_dhcp_v6_client_stop(netconfig->l_dhcp_v6_client);
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*/
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gateway = netconfig_ipv6_get_gateway(netconfig);
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if (!gateway)
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return;
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@ -1117,6 +1170,8 @@ bool netconfig_configure(struct netconfig *netconfig,
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l_dhcp_client_set_address(netconfig->dhcp_client, ARPHRD_ETHER,
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mac_address, ETH_ALEN);
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l_dhcp6_client_set_address(netconfig->dhcp6_client, ARPHRD_ETHER,
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mac_address, ETH_ALEN);
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netconfig_ipv4_select_and_install(netconfig);
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@ -1167,7 +1222,9 @@ char *netconfig_get_dhcp_server_ipv4(struct netconfig *netconfig)
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struct netconfig *netconfig_new(uint32_t ifindex)
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{
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struct netdev *netdev = netdev_find(ifindex);
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struct netconfig *netconfig;
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struct l_icmp6_client *icmp6;
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if (!netconfig_list)
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return NULL;
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@ -1183,10 +1240,35 @@ struct netconfig *netconfig_new(uint32_t ifindex)
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netconfig->ifaddr_list = l_queue_new();
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netconfig->resolve = resolve_new(ifindex);
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netconfig_ipv4_dhcp_create(netconfig);
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netconfig->dhcp_client = l_dhcp_client_new(ifindex);
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l_dhcp_client_set_event_handler(netconfig->dhcp_client,
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netconfig_ipv4_dhcp_event_handler,
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netconfig, NULL);
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if (getenv("IWD_DHCP_DEBUG"))
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l_dhcp_client_set_debug(netconfig->dhcp_client, do_debug,
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"[DHCPv4] ", NULL);
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netconfig->dhcp6_client = l_dhcp6_client_new(ifindex);
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l_dhcp6_client_set_event_handler(netconfig->dhcp6_client,
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netconfig_dhcp6_event_handler,
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netconfig, NULL);
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l_dhcp6_client_set_lla_randomized(netconfig->dhcp6_client, true);
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l_dhcp6_client_set_nodelay(netconfig->dhcp6_client, true);
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l_dhcp6_client_set_rtnl(netconfig->dhcp6_client, rtnl);
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if (getenv("IWD_DHCP_DEBUG"))
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l_dhcp6_client_set_debug(netconfig->dhcp6_client, do_debug,
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"[DHCPv6] ", NULL);
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icmp6 = l_dhcp6_client_get_icmp6(netconfig->dhcp6_client);
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l_icmp6_client_set_rtnl(icmp6, rtnl);
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l_icmp6_client_set_route_priority(icmp6, ROUTE_PRIORITY_OFFSET);
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l_queue_push_tail(netconfig_list, netconfig);
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sysfs_write_ipv6_setting(netdev_get_name(netdev), "accept_ra", "0");
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return netconfig;
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}
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