diff options
Diffstat (limited to 'src/vnet/dhcp/dhcp6_ia_na_client_cp.c')
| -rw-r--r-- | src/vnet/dhcp/dhcp6_ia_na_client_cp.c | 831 |
1 files changed, 831 insertions, 0 deletions
diff --git a/src/vnet/dhcp/dhcp6_ia_na_client_cp.c b/src/vnet/dhcp/dhcp6_ia_na_client_cp.c new file mode 100644 index 00000000000..e83eecc17c3 --- /dev/null +++ b/src/vnet/dhcp/dhcp6_ia_na_client_cp.c @@ -0,0 +1,831 @@ +/* + * Copyright (c) 2018 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <vnet/vnet.h> +#include <vlibmemory/api.h> +#include <vnet/vnet_msg_enum.h> +#include <vnet/dhcp/dhcp6_packet.h> +#include <vnet/dhcp/dhcp6_ia_na_client_dp.h> +#include <vnet/ip/ip.h> +#include <vnet/ip/ip6.h> +#include <float.h> +#include <math.h> + +#define vl_typedefs /* define message structures */ +#include <vnet/vnet_all_api_h.h> +#undef vl_typedefs + +#define vl_endianfun /* define message structures */ +#include <vnet/vnet_all_api_h.h> +#undef vl_endianfun + +#include <vlibapi/api_helper_macros.h> + +#define foreach_dhcp6_client_cp_msg \ +_(DHCP6_CLIENT_ENABLE_DISABLE, dhcp6_client_enable_disable) + +#define vl_api_dhcp6_client_enable_disable_t_print vl_noop_handler + +typedef struct +{ + u32 sw_if_index; + ip6_address_t address; + u32 preferred_lt; + u32 valid_lt; + f64 due_time; +} address_info_t; + +typedef struct +{ + u8 enabled; + u32 server_index; + u32 T1; + u32 T2; + f64 T1_due_time; + f64 T2_due_time; + u32 address_count; + u8 rebinding; +} client_state_t; + +typedef struct +{ + address_info_t *address_pool; + client_state_t *client_state_by_sw_if_index; + u32 n_clients; + f64 max_valid_due_time; + + /* convenience */ + vlib_main_t *vlib_main; + vnet_main_t *vnet_main; + api_main_t *api_main; + u32 node_index; +} dhcp6_client_cp_main_t; + +static dhcp6_client_cp_main_t dhcp6_client_cp_main; + +enum +{ + RD_CP_EVENT_INTERRUPT, + RD_CP_EVENT_DISABLE, +}; + +static void +send_client_message_start_stop (u32 sw_if_index, u32 server_index, + u8 msg_type, address_info_t * address_list, + u8 start) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + dhcp6_send_client_message_params_t params = { 0, }; + dhcp6_send_client_message_params_address_t *addresses = 0, *addr; + u32 i; + + ASSERT (sw_if_index < vec_len (rm->client_state_by_sw_if_index) && + rm->client_state_by_sw_if_index[sw_if_index].enabled); + client_state_t *client_state = + &rm->client_state_by_sw_if_index[sw_if_index]; + + params.sw_if_index = sw_if_index; + params.server_index = server_index; + params.msg_type = msg_type; + if (start) + { + if (msg_type == DHCPV6_MSG_SOLICIT) + { + params.irt = 1; + params.mrt = 120; + } + else if (msg_type == DHCPV6_MSG_REQUEST) + { + params.irt = 1; + params.mrt = 30; + params.mrc = 10; + } + else if (msg_type == DHCPV6_MSG_RENEW) + { + params.irt = 10; + params.mrt = 600; + f64 current_time = vlib_time_now (rm->vlib_main); + i32 diff_time = client_state->T2 - current_time; + if (diff_time < 0) + diff_time = 0; + params.mrd = diff_time; + } + else if (msg_type == DHCPV6_MSG_REBIND) + { + params.irt = 10; + params.mrt = 600; + f64 current_time = vlib_time_now (rm->vlib_main); + i32 diff_time = rm->max_valid_due_time - current_time; + if (diff_time < 0) + diff_time = 0; + params.mrd = diff_time; + } + else if (msg_type == DHCPV6_MSG_RELEASE) + { + params.mrc = 1; + } + } + + params.T1 = 0; + params.T2 = 0; + if (vec_len (address_list) != 0) + vec_validate (addresses, vec_len (address_list) - 1); + for (i = 0; i < vec_len (address_list); i++) + { + address_info_t *address = &address_list[i]; + addr = &addresses[i]; + addr->valid_lt = address->valid_lt; + addr->preferred_lt = address->preferred_lt; + addr->address = address->address; + } + params.addresses = addresses; + + dhcp6_send_client_message (rm->vlib_main, sw_if_index, !start, ¶ms); + + vec_free (params.addresses); +} + +static void interrupt_process (void); + +static u32 +ip6_enable (u32 sw_if_index) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + clib_error_t *rv; + + rv = enable_ip6_interface (rm->vlib_main, sw_if_index); + + return rv != 0; +} + +static u8 +ip6_addresses_equal (ip6_address_t * address1, ip6_address_t * address2) +{ + if (address1->as_u64[0] != address2->as_u64[0]) + return 0; + return address1->as_u64[1] == address2->as_u64[1]; +} + +static clib_error_t * +dhcp6_reply_event_handler (vl_api_dhcp6_reply_event_t * mp) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vlib_main_t *vm = rm->vlib_main; + client_state_t *client_state; + ip6_address_t *address; + u32 sw_if_index; + u32 n_addresses; + vl_api_dhcp6_address_info_t *api_address; + u32 inner_status_code; + u32 status_code; + u32 server_index; + f64 current_time; + clib_error_t *error = 0; + u32 i; + + current_time = vlib_time_now (vm); + + sw_if_index = ntohl (mp->sw_if_index); + + if (sw_if_index >= vec_len (rm->client_state_by_sw_if_index)) + return 0; + + client_state = &rm->client_state_by_sw_if_index[sw_if_index]; + + if (!client_state->enabled) + return 0; + + server_index = ntohl (mp->server_index); + + n_addresses = ntohl (mp->n_addresses); + + inner_status_code = ntohs (mp->inner_status_code); + status_code = ntohs (mp->status_code); + + if (mp->msg_type == DHCPV6_MSG_ADVERTISE + && client_state->server_index == ~0) + { + address_info_t *address_list = 0, *address_info; + + if (inner_status_code == DHCPV6_STATUS_NOADDRS_AVAIL) + { + clib_warning + ("Advertise message arrived with NoAddrsAvail status code"); + return 0; + } + + if (n_addresses > 0) + vec_validate (address_list, n_addresses - 1); + for (i = 0; i < n_addresses; i++) + { + api_address = &mp->addresses[i]; + address = (ip6_address_t *) api_address->address; + + address_info = &address_list[i]; + address_info->address = *address; + address_info->preferred_lt = 0; + address_info->valid_lt = 0; + } + + client_state->server_index = server_index; + + send_client_message_start_stop (sw_if_index, server_index, + DHCPV6_MSG_REQUEST, address_list, 1); + vec_free (address_list); + } + + if (mp->msg_type != DHCPV6_MSG_REPLY) + return 0; + + if (!client_state->rebinding && client_state->server_index != server_index) + { + clib_warning ("Reply message arrived with Server ID different " + "from that in Request or Renew message"); + return 0; + } + + if (inner_status_code == DHCPV6_STATUS_NOADDRS_AVAIL) + { + clib_warning ("Reply message arrived with NoAddrsAvail status code"); + if (n_addresses > 0) + { + clib_warning + ("Invalid Reply message arrived: It contains NoAddrsAvail " + "status code but also contains addresses"); + return 0; + } + } + + if (status_code == DHCPV6_STATUS_UNSPEC_FAIL) + { + clib_warning ("Reply message arrived with UnspecFail status code"); + return 0; + } + + send_client_message_start_stop (sw_if_index, server_index, + mp->msg_type, 0, 0); + + for (i = 0; i < n_addresses; i++) + { + address_info_t *address_info = 0; + u32 valid_time; + u32 preferred_time; + + api_address = &mp->addresses[i]; + + address = (ip6_address_t *) api_address->address; + + if (ip6_address_is_link_local_unicast (address)) + continue; + + valid_time = ntohl (api_address->valid_time); + preferred_time = ntohl (api_address->preferred_time); + + if (preferred_time > valid_time) + continue; + + u8 address_already_present = 0; + /* *INDENT-OFF* */ + pool_foreach (address_info, rm->address_pool, + ({ + if (address_info->sw_if_index != sw_if_index) + ; + else if (!ip6_addresses_equal (&address_info->address, address)) + ; + else + { + address_already_present = 1; + goto address_pool_foreach_out; + } + })); + /* *INDENT-ON* */ + address_pool_foreach_out: + + if (address_already_present) + { + address_info->preferred_lt = preferred_time; + address_info->valid_lt = valid_time; + address_info->due_time = current_time + valid_time; + if (address_info->due_time > rm->max_valid_due_time) + rm->max_valid_due_time = address_info->due_time; + continue; + } + + if (valid_time == 0) + continue; + + pool_get (rm->address_pool, address_info); + address_info->sw_if_index = sw_if_index; + address_info->address = *address; + address_info->preferred_lt = preferred_time; + address_info->valid_lt = valid_time; + address_info->due_time = current_time + valid_time; + if (address_info->due_time > rm->max_valid_due_time) + rm->max_valid_due_time = address_info->due_time; + rm->client_state_by_sw_if_index[sw_if_index].address_count++; + + error = ip6_add_del_interface_address (vm, sw_if_index, + &address_info->address, 64, 0); + if (error) + clib_warning ("Failed to add interface address"); + } + + client_state->server_index = server_index; + client_state->T1 = ntohl (mp->T1); + client_state->T2 = ntohl (mp->T2); + if (client_state->T1 != 0) + client_state->T1_due_time = current_time + client_state->T1; + if (client_state->T2 != 0) + client_state->T2_due_time = current_time + client_state->T2; + client_state->rebinding = 0; + + interrupt_process (); + + return error; +} + +static address_info_t * +create_address_list (u32 sw_if_index) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + address_info_t *address_info, *address_list = 0;; + + /* *INDENT-OFF* */ + pool_foreach (address_info, rm->address_pool, + ({ + if (address_info->sw_if_index == sw_if_index) + { + u32 pos = vec_len (address_list); + vec_validate (address_list, pos); + clib_memcpy (&address_list[pos], address_info, sizeof (*address_info)); + } + })); + /* *INDENT-ON* */ + + return address_list; +} + +VNET_DHCP6_REPLY_EVENT_FUNCTION (dhcp6_reply_event_handler); + +static uword +dhcp6_client_cp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, + vlib_frame_t * f) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + address_info_t *address_info; + client_state_t *client_state; + f64 sleep_time = 1e9; + clib_error_t *error; + f64 current_time; + f64 due_time; + uword event_type; + uword *event_data = 0; + int i; + + while (1) + { + vlib_process_wait_for_event_or_clock (vm, sleep_time); + event_type = vlib_process_get_events (vm, &event_data); + vec_reset_length (event_data); + + if (event_type == RD_CP_EVENT_DISABLE) + { + vlib_node_set_state (vm, rm->node_index, VLIB_NODE_STATE_DISABLED); + sleep_time = 1e9; + continue; + } + + current_time = vlib_time_now (vm); + do + { + due_time = current_time + 1e9; + /* *INDENT-OFF* */ + pool_foreach (address_info, rm->address_pool, + ({ + if (address_info->due_time > current_time) + { + if (address_info->due_time < due_time) + due_time = address_info->due_time; + } + else + { + u32 sw_if_index = address_info->sw_if_index; + error = ip6_add_del_interface_address (vm, sw_if_index, + &address_info->address, + 64, 1); + if (error) + clib_warning ("Failed to delete interface address"); + pool_put (rm->address_pool, address_info); + /* make sure ip6 stays enabled */ + ip6_enable (sw_if_index); + client_state = &rm->client_state_by_sw_if_index[sw_if_index]; + if (--client_state->address_count == 0) + { + client_state->rebinding = 0; + client_state->server_index = ~0; + send_client_message_start_stop (sw_if_index, ~0, + DHCPV6_MSG_SOLICIT, + 0, 1); + } + } + })); + /* *INDENT-ON* */ + for (i = 0; i < vec_len (rm->client_state_by_sw_if_index); i++) + { + client_state_t *cs = &rm->client_state_by_sw_if_index[i]; + if (cs->enabled && cs->server_index != ~0) + { + if (cs->T2_due_time > current_time) + { + if (cs->T2_due_time < due_time) + due_time = cs->T2_due_time; + if (cs->T1_due_time > current_time) + { + if (cs->T1_due_time < due_time) + due_time = cs->T1_due_time; + } + else + { + cs->T1_due_time = DBL_MAX; + address_info_t *address_list; + address_list = create_address_list (i); + cs->rebinding = 1; + send_client_message_start_stop (i, cs->server_index, + DHCPV6_MSG_RENEW, + address_list, 1); + vec_free (address_list); + } + } + else + { + cs->T2_due_time = DBL_MAX; + address_info_t *address_list; + address_list = create_address_list (i); + cs->rebinding = 1; + send_client_message_start_stop (i, ~0, + DHCPV6_MSG_REBIND, + address_list, 1); + vec_free (address_list); + } + } + } + current_time = vlib_time_now (vm); + } + while (due_time < current_time); + + sleep_time = due_time - current_time; + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (dhcp6_client_cp_process_node) = { + .function = dhcp6_client_cp_process, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "dhcp6-client-cp-process", +}; +/* *INDENT-ON* */ + +static void +interrupt_process (void) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vlib_main_t *vm = rm->vlib_main; + + vlib_process_signal_event (vm, dhcp6_client_cp_process_node.index, + RD_CP_EVENT_INTERRUPT, 0); +} + +static void +disable_process (void) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vlib_main_t *vm = rm->vlib_main; + + vlib_process_signal_event (vm, dhcp6_client_cp_process_node.index, + RD_CP_EVENT_DISABLE, 0); +} + +static void +enable_process (void) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vlib_main_t *vm = rm->vlib_main; + vlib_node_t *node; + + node = vec_elt (vm->node_main.nodes, rm->node_index); + + vlib_node_set_state (vm, rm->node_index, VLIB_NODE_STATE_POLLING); + vlib_start_process (vm, node->runtime_index); +} + +static clib_error_t * +dhcp6_addresses_show_command_function (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + dhcp6_client_cp_main_t *dm = &dhcp6_client_cp_main; + clib_error_t *error = 0; + address_info_t *address_info; + f64 current_time = vlib_time_now (vm); + + /* *INDENT-OFF* */ + pool_foreach (address_info, dm->address_pool, + ({ + vlib_cli_output (vm, "address: %U, " + "preferred lifetime: %u, valid lifetime: %u " + "(%f remaining)", + format_ip6_address, &address_info->address, + address_info->preferred_lt, address_info->valid_lt, + address_info->due_time - current_time); + })); + /* *INDENT-ON* */ + + return error; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcp6_addresses_show_command, static) = { + .path = "show dhcp6 addresses", + .short_help = "show dhcp6 addresses", + .function = dhcp6_addresses_show_command_function, +}; +/* *INDENT-ON* */ + +static clib_error_t * +dhcp6_clients_show_command_function (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + clib_error_t *error = 0; + client_state_t *cs; + f64 current_time = vlib_time_now (vm); + char buf1[256]; + char buf2[256]; + const char *rebinding; + u32 i; + + for (i = 0; i < vec_len (rm->client_state_by_sw_if_index); i++) + { + cs = &rm->client_state_by_sw_if_index[i]; + if (cs->enabled) + { + if (cs->T1_due_time != DBL_MAX && cs->T1_due_time > current_time) + { + sprintf (buf1, "%u remaining", + (u32) round (cs->T1_due_time - current_time)); + } + else + sprintf (buf1, "timeout"); + if (cs->T2_due_time != DBL_MAX && cs->T2_due_time > current_time) + sprintf (buf2, "%u remaining", + (u32) round (cs->T2_due_time - current_time)); + else + sprintf (buf2, "timeout"); + if (cs->rebinding) + rebinding = ", REBINDING"; + else + rebinding = ""; + if (cs->T1) + vlib_cli_output (vm, + "sw_if_index: %u, T1: %u (%s), " + "T2: %u (%s), server index: %d%s", i, + cs->T1, buf1, cs->T2, buf2, + cs->server_index, rebinding); + else + vlib_cli_output (vm, "sw_if_index: %u%s", i, rebinding); + } + } + + return error; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcp6_clients_show_command, static) = { + .path = "show dhcp6 clients", + .short_help = "show dhcp6 clients", + .function = dhcp6_clients_show_command_function, +}; +/* *INDENT-ON* */ + +static int +dhcp6_client_enable_disable (u32 sw_if_index, u8 enable) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vnet_main_t *vnm = rm->vnet_main; + vlib_main_t *vm = rm->vlib_main; + client_state_t *client_state; + client_state_t empty_config = { 0 }; + address_info_t *address_info; + clib_error_t *error; + + if (!vnet_sw_interface_is_api_valid (vnm, sw_if_index)) + { + clib_warning ("Invalid sw_if_index"); + return 1; + } + + vec_validate_init_empty (rm->client_state_by_sw_if_index, sw_if_index, + empty_config); + client_state = &rm->client_state_by_sw_if_index[sw_if_index]; + + u8 old_enabled = client_state->enabled; + if (enable) + client_state->enabled = 1; + client_state->server_index = ~0; + + if (!old_enabled && enable) + { + rm->n_clients++; + if (rm->n_clients == 1) + { + enable_process (); + dhcp6_clients_enable_disable (1); + } + + ip6_enable (sw_if_index); + send_client_message_start_stop (sw_if_index, ~0, DHCPV6_MSG_SOLICIT, + 0, 1); + } + else if (old_enabled && !enable) + { + send_client_message_start_stop (sw_if_index, ~0, ~0, 0, 0); + + rm->n_clients--; + if (rm->n_clients == 0) + { + dhcp6_clients_enable_disable (0); + disable_process (); + } + + /* *INDENT-OFF* */ + pool_foreach (address_info, rm->address_pool, + ({ + if (address_info->sw_if_index == sw_if_index) + { + ASSERT (sw_if_index < vec_len (rm->client_state_by_sw_if_index) && + rm->client_state_by_sw_if_index[sw_if_index].enabled); + client_state_t *client_state = + &rm->client_state_by_sw_if_index[sw_if_index]; + send_client_message_start_stop (sw_if_index, + client_state->server_index, + DHCPV6_MSG_RELEASE, address_info, + 1); + error = ip6_add_del_interface_address (vm, sw_if_index, + &address_info->address, + 64, 1); + if (error) + clib_warning ("Failed to delete interface address"); + pool_put (rm->address_pool, address_info); + } + })); + /* *INDENT-ON* */ + } + + if (!enable) + client_state->enabled = 0; + + return 0; +} + +static clib_error_t * +dhcp6_client_enable_disable_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + vnet_main_t *vnm = rm->vnet_main; + clib_error_t *error = 0; + u32 sw_if_index = ~0; + u8 enable = 1; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat + (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index)) + ; + else if (unformat (input, "disable")) + enable = 0; + else + { + error = clib_error_return (0, "unexpected input `%U'", + format_unformat_error, input); + goto done; + } + } + + if (sw_if_index != ~0) + { + if (dhcp6_client_enable_disable (sw_if_index, enable) != 0) + error = clib_error_return (0, "Invalid sw_if_index"); + } + else + error = clib_error_return (0, "Missing sw_if_index"); + +done: + return error; +} + +/*? + * This command is used to enable/disable DHCPv6 client + * on particular interface. + * + * @cliexpar + * @parblock + * Example of how to enable DHCPv6 client: + * @cliexcmd{dhcp6 client GigabitEthernet2/0/0} + * Example of how to disable DHCPv6 client: + * @cliexcmd{dhcp6 client GigabitEthernet2/0/0 disable} + * @endparblock +?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcp6_client_enable_disable_command, static) = { + .path = "dhcp6 client", + .short_help = "dhcp6 client <interface> [disable]", + .function = dhcp6_client_enable_disable_command_fn, +}; +/* *INDENT-ON* */ + +static void + vl_api_dhcp6_client_enable_disable_t_handler + (vl_api_dhcp6_client_enable_disable_t * mp) +{ + vl_api_dhcp6_client_enable_disable_reply_t *rmp; + u32 sw_if_index; + int rv = 0; + + VALIDATE_SW_IF_INDEX (mp); + + sw_if_index = ntohl (mp->sw_if_index); + + rv = dhcp6_client_enable_disable (sw_if_index, mp->enable); + + BAD_SW_IF_INDEX_LABEL; + + REPLY_MACRO (VL_API_SW_INTERFACE_SET_TABLE_REPLY); +} + +#define vl_msg_name_crc_list +#include <vnet/dhcp/dhcp6_ia_na_client_cp.api.h> +#undef vl_msg_name_crc_list + +static void +setup_message_id_table (api_main_t * am) +{ +#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id); + foreach_vl_msg_name_crc_dhcp6_ia_na_client_cp; +#undef _ +} + +static clib_error_t * +dhcp_client_cp_init (vlib_main_t * vm) +{ + dhcp6_client_cp_main_t *rm = &dhcp6_client_cp_main; + api_main_t *am = &api_main; + + rm->vlib_main = vm; + rm->vnet_main = vnet_get_main (); + rm->api_main = am; + rm->node_index = dhcp6_client_cp_process_node.index; + +#define _(N,n) \ + vl_msg_api_set_handlers(VL_API_##N, #n, \ + vl_api_##n##_t_handler, \ + vl_noop_handler, \ + vl_api_##n##_t_endian, \ + vl_api_##n##_t_print, \ + sizeof(vl_api_##n##_t), 0/* do NOT trace! */); + foreach_dhcp6_client_cp_msg; +#undef _ + + /* + * Set up the (msg_name, crc, message-id) table + */ + setup_message_id_table (am); + + return 0; +} + +VLIB_INIT_FUNCTION (dhcp_client_cp_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |