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path: root/src/vnet/l2tp/l2tp_api.c
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/*
 *------------------------------------------------------------------
 * l2tp_api.c - l2tpv3 api
 *
 * Copyright (c) 2016 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/interface.h>
#include <vnet/api_errno.h>
#include <vnet/l2tp/l2tp.h>

#include <vnet/vnet_msg_enum.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

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <vnet/vnet_all_api_h.h>
#undef vl_printfun

#include <vlibapi/api_helper_macros.h>

#define foreach_vpe_api_msg                             \
_(L2TPV3_CREATE_TUNNEL, l2tpv3_create_tunnel)                           \
_(L2TPV3_SET_TUNNEL_COOKIES, l2tpv3_set_tunnel_cookies)                 \
_(L2TPV3_INTERFACE_ENABLE_DISABLE, l2tpv3_interface_enable_disable)     \
_(L2TPV3_SET_LOOKUP_KEY, l2tpv3_set_lookup_key)                         \
_(SW_IF_L2TPV3_TUNNEL_DUMP, sw_if_l2tpv3_tunnel_dump)

static void
send_sw_if_l2tpv3_tunnel_details (vpe_api_main_t * am,
				  vl_api_registration_t * reg,
				  l2t_session_t * s,
				  l2t_main_t * lm, u32 context)
{
  vl_api_sw_if_l2tpv3_tunnel_details_t *mp;
  u8 *if_name = NULL;
  vnet_sw_interface_t *si = NULL;

  si = vnet_get_hw_sw_interface (lm->vnet_main, s->hw_if_index);

  if_name = format (if_name, "%U",
		    format_vnet_sw_interface_name, lm->vnet_main, si);

  mp = vl_msg_api_alloc (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_SW_IF_L2TPV3_TUNNEL_DETAILS);
  strncpy ((char *) mp->interface_name,
	   (char *) if_name, ARRAY_LEN (mp->interface_name) - 1);
  mp->sw_if_index = ntohl (si->sw_if_index);
  mp->local_session_id = s->local_session_id;
  mp->remote_session_id = s->remote_session_id;
  mp->local_cookie[0] = s->local_cookie[0];
  mp->local_cookie[1] = s->local_cookie[1];
  mp->remote_cookie = s->remote_cookie;
  clib_memcpy (mp->client_address, &s->client_address,
	       sizeof (s->client_address));
  clib_memcpy (mp->our_address, &s->our_address, sizeof (s->our_address));
  mp->l2_sublayer_present = s->l2_sublayer_present;
  mp->context = context;

  vl_api_send_msg (reg, (u8 *) mp);
}


static void
vl_api_sw_if_l2tpv3_tunnel_dump_t_handler (vl_api_sw_if_l2tpv3_tunnel_dump_t *
					   mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  l2t_main_t *lm = &l2t_main;
  vl_api_registration_t *reg;
  l2t_session_t *session;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  /* *INDENT-OFF* */
  pool_foreach (session, lm->sessions,
  ({
    send_sw_if_l2tpv3_tunnel_details (am, reg, session, lm, mp->context);
  }));
  /* *INDENT-ON* */
}

static void vl_api_l2tpv3_create_tunnel_t_handler
  (vl_api_l2tpv3_create_tunnel_t * mp)
{
  vl_api_l2tpv3_create_tunnel_reply_t *rmp;
  l2t_main_t *lm = &l2t_main;
  u32 sw_if_index = (u32) ~ 0;
  int rv;

  if (mp->is_ipv6 != 1)
    {
      rv = VNET_API_ERROR_UNIMPLEMENTED;
      goto out;
    }

  u32 encap_fib_index;

  if (mp->encap_vrf_id != ~0)
    {
      uword *p;
      ip6_main_t *im = &ip6_main;
      if (!
	  (p =
	   hash_get (im->fib_index_by_table_id, ntohl (mp->encap_vrf_id))))
	{
	  rv = VNET_API_ERROR_NO_SUCH_FIB;
	  goto out;
	}
      encap_fib_index = p[0];
    }
  else
    {
      encap_fib_index = ~0;
    }

  rv = create_l2tpv3_ipv6_tunnel (lm,
				  (ip6_address_t *) mp->client_address,
				  (ip6_address_t *) mp->our_address,
				  ntohl (mp->local_session_id),
				  ntohl (mp->remote_session_id),
				  clib_net_to_host_u64 (mp->local_cookie),
				  clib_net_to_host_u64 (mp->remote_cookie),
				  mp->l2_sublayer_present,
				  encap_fib_index, &sw_if_index);

out:
  /* *INDENT-OFF* */
  REPLY_MACRO2(VL_API_L2TPV3_CREATE_TUNNEL_REPLY,
  ({
    rmp->sw_if_index = ntohl (sw_if_index);
  }));
  /* *INDENT-ON* */
}

static void vl_api_l2tpv3_set_tunnel_cookies_t_handler
  (vl_api_l2tpv3_set_tunnel_cookies_t * mp)
{
  vl_api_l2tpv3_set_tunnel_cookies_reply_t *rmp;
  l2t_main_t *lm = &l2t_main;
  int rv;

  VALIDATE_SW_IF_INDEX (mp);

  rv = l2tpv3_set_tunnel_cookies (lm, ntohl (mp->sw_if_index),
				  clib_net_to_host_u64 (mp->new_local_cookie),
				  clib_net_to_host_u64
				  (mp->new_remote_cookie));

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_L2TPV3_SET_TUNNEL_COOKIES_REPLY);
}

static void vl_api_l2tpv3_interface_enable_disable_t_handler
  (vl_api_l2tpv3_interface_enable_disable_t * mp)
{
  int rv;
  vnet_main_t *vnm = vnet_get_main ();
  vl_api_l2tpv3_interface_enable_disable_reply_t *rmp;

  VALIDATE_SW_IF_INDEX (mp);

  rv = l2tpv3_interface_enable_disable
    (vnm, ntohl (mp->sw_if_index), mp->enable_disable);

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_L2TPV3_INTERFACE_ENABLE_DISABLE_REPLY);
}

static void vl_api_l2tpv3_set_lookup_key_t_handler
  (vl_api_l2tpv3_set_lookup_key_t * mp)
{
  int rv = 0;
  l2t_main_t *lm = &l2t_main;
  vl_api_l2tpv3_set_lookup_key_reply_t *rmp;

  if (mp->key > L2T_LOOKUP_SESSION_ID)
    {
      rv = VNET_API_ERROR_INVALID_VALUE;
      goto out;
    }

  lm->lookup_type = mp->key;

out:
  REPLY_MACRO (VL_API_L2TPV3_SET_LOOKUP_KEY_REPLY);
}

/*
 * l2tp_api_hookup
 * Add vpe's API message handlers to the table.
 * vlib has already mapped shared memory and
 * added the client registration handlers.
 * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
 */
#define vl_msg_name_crc_list
#include <vnet/vnet_all_api_h.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_l2tp;
#undef _
}

static clib_error_t *
l2tp_api_hookup (vlib_main_t * vm)
{
  api_main_t *am = &api_main;

#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), 1);
  foreach_vpe_api_msg;
#undef _

  /*
   * Set up the (msg_name, crc, message-id) table
   */
  setup_message_id_table (am);

  return 0;
}

VLIB_API_INIT_FUNCTION (l2tp_api_hookup);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
s="p">, default_route-> sw_if_index); fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP6, }; ip46_address_t nh = { .ip6 = default_route->router_address, }; fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_API, FIB_ENTRY_FLAG_NONE, DPO_PROTO_IP6, &nh, default_route->sw_if_index, 0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); } } static int remove_slaac_address (vlib_main_t * vm, slaac_address_t * slaac_address) { rd_cp_main_t *rm = &rd_cp_main; clib_error_t *rv = 0; rv = ip6_add_del_interface_address (vm, slaac_address->sw_if_index, &slaac_address->address, slaac_address->address_length, 1); pool_put (rm->slaac_address_pool, slaac_address); return rv != 0; } static void remove_default_route (vlib_main_t * vm, default_route_t * default_route) { rd_cp_main_t *rm = &rd_cp_main; { u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, default_route-> sw_if_index); fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP6, }; ip46_address_t nh = { .ip6 = default_route->router_address, }; fib_table_entry_path_remove (fib_index, &pfx, FIB_SOURCE_API, DPO_PROTO_IP6, &nh, default_route->sw_if_index, 0, 1, FIB_ROUTE_PATH_FLAG_NONE); } pool_put (rm->default_route_pool, default_route); } static u32 get_interface_mac_address (u32 sw_if_index, u8 mac[]) { rd_cp_main_t *rm = &rd_cp_main; vnet_sw_interface_t *si; ethernet_interface_t *eth_if = 0; if (!vnet_sw_interface_is_api_valid (rm->vnet_main, sw_if_index)) { vlib_log_warn (rm->log_class, "Invalid sw_if_index"); return 1; } si = vnet_get_sup_sw_interface (rm->vnet_main, sw_if_index); if (si->type == VNET_SW_INTERFACE_TYPE_HARDWARE) eth_if = ethernet_get_interface (&ethernet_main, si->hw_if_index); if (!eth_if) { vlib_log_warn (rm->log_class, "Failed to get hardware interface"); return 1; } clib_memcpy_fast (mac, eth_if->address, 6); return 0; } static u32 ip6_enable (u32 sw_if_index) { rd_cp_main_t *rm = &rd_cp_main; clib_error_t *rv; rv = enable_ip6_interface (rm->vlib_main, sw_if_index); return rv != 0; } static u8 ip6_prefixes_equal (ip6_address_t * prefix1, ip6_address_t * prefix2, u8 len) { if (len >= 64) { if (prefix1->as_u64[0] != prefix2->as_u64[0]) return 0; if (len == 64) return 1; return prefix1->as_u64[1] >> (128 - len) == prefix2->as_u64[1] >> (128 - len); } return prefix1->as_u64[0] >> (64 - len) == prefix2->as_u64[0] >> (64 - len); } #define PREFIX_FLAG_A (1 << 6) #define PREFIX_FLAG_L (1 << 7) static clib_error_t * ip6_ra_report_handler (void *data) { rd_cp_main_t *rm = &rd_cp_main; vlib_main_t *vm = rm->vlib_main; clib_error_t *error = 0; ra_report_t *r = data; interface_config_t *if_config; default_route_t *default_route; slaac_address_t *slaac_address; u32 sw_if_index; u16 router_lifetime_in_sec; u32 n_prefixes; ra_report_prefix_info_t *prefix; u8 mac[6]; f64 current_time; u32 i; current_time = vlib_time_now (vm); sw_if_index = r->sw_if_index; if (sw_if_index >= vec_len (rm->config_by_sw_if_index)) return 0; if_config = &rm->config_by_sw_if_index[sw_if_index]; if (if_config->install_default_routes) { router_lifetime_in_sec = r->router_lifetime_in_sec; u8 route_already_present = 0; /* *INDENT-OFF* */ pool_foreach (default_route, rm->default_route_pool, ({ if (default_route->sw_if_index != sw_if_index) ; else if (0 != memcmp (&default_route->router_address, &r->router_address, 16)) ; else { route_already_present = 1; goto default_route_pool_foreach_out; } })); /* *INDENT-ON* */ default_route_pool_foreach_out: if (!route_already_present) { if (router_lifetime_in_sec != 0) add_default_route (vm, sw_if_index, &r->router_address, current_time + router_lifetime_in_sec); } else { if (router_lifetime_in_sec != 0) default_route->due_time = current_time + router_lifetime_in_sec; else remove_default_route (vm, default_route); } } if (get_interface_mac_address (sw_if_index, mac) != 0) { vlib_log_warn (rm->log_class, "Error getting MAC address"); return clib_error_return (0, "Error getting MAC address"); } if (!if_config->enabled) return 0; n_prefixes = vec_len (r->prefixes); for (i = 0; i < n_prefixes; i++) { ip6_address_t *dst_address; u8 prefix_length; u32 valid_time; u32 preferred_time; f64 due_time; prefix = &r->prefixes[i]; if (!(prefix->flags & PREFIX_FLAG_A)) continue; dst_address = &prefix->prefix.fp_addr.ip6; prefix_length = prefix->prefix.fp_len; if (ip6_address_is_link_local_unicast (dst_address)) continue; valid_time = prefix->valid_time; preferred_time = prefix->preferred_time; if (preferred_time > valid_time) continue; if (prefix_length != 64) continue; u8 address_already_present = 0; /* *INDENT-OFF* */ pool_foreach (slaac_address, rm->slaac_address_pool, ({ if (slaac_address->sw_if_index != sw_if_index) ; else if (slaac_address->address_length != prefix_length) ; else if (!ip6_prefixes_equal (&slaac_address->address, dst_address, prefix_length)) ; else { address_already_present = 1; goto slaac_address_pool_foreach_out; } })); /* *INDENT-ON* */ slaac_address_pool_foreach_out: if (address_already_present) { f64 remaining_life_time = slaac_address->due_time - current_time; if (valid_time > 2 * 60 * 60 || valid_time > remaining_life_time) slaac_address->due_time = current_time + valid_time; else if (remaining_life_time > 2 * 60 * 60) slaac_address->due_time = current_time + 2 * 60 * 60; continue; } if (valid_time == 0) continue; due_time = current_time + valid_time; ip6_address_t addr; addr.as_u64[0] = dst_address->as_u64[0]; /* Invert the "u" bit */ addr.as_u8[8] = mac[0] ^ (1 << 1); addr.as_u8[9] = mac[1]; addr.as_u8[10] = mac[2]; addr.as_u8[11] = 0xFF; addr.as_u8[12] = 0xFE; addr.as_u8[13] = mac[3]; addr.as_u8[14] = mac[4]; addr.as_u8[15] = mac[5]; add_slaac_address (vm, sw_if_index, prefix_length, &addr, due_time); } interrupt_process (); return error; } VNET_IP6_NEIGHBOR_RA_FUNCTION (ip6_ra_report_handler); static uword rd_cp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { uword *event_data = 0; rd_cp_main_t *rm = &rd_cp_main; slaac_address_t *slaac_address; default_route_t *default_route; f64 sleep_time = 1e9; f64 current_time; f64 due_time; while (1) { vlib_process_wait_for_event_or_clock (vm, sleep_time); vlib_process_get_events (vm, &event_data); vec_reset_length (event_data); current_time = vlib_time_now (vm); do { due_time = current_time + 1e9; /* *INDENT-OFF* */ pool_foreach (slaac_address, rm->slaac_address_pool, ({ if (slaac_address->due_time > current_time) { if (slaac_address->due_time < due_time) due_time = slaac_address->due_time; } else { remove_slaac_address (vm, slaac_address); /* make sure ip6 stays enabled */ ip6_enable (slaac_address->sw_if_index); } })); pool_foreach (default_route, rm->default_route_pool, ({ if (default_route->due_time > current_time) { if (default_route->due_time < due_time) due_time = default_route->due_time; } else remove_default_route (vm, default_route); })); /* *INDENT-ON* */ current_time = vlib_time_now (vm); } while (due_time < current_time); sleep_time = due_time - current_time; } return 0; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (rd_cp_process_node) = { .function = rd_cp_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "rd-cp-process", }; /* *INDENT-ON* */ static void interrupt_process (void) { rd_cp_main_t *rm = &rd_cp_main; vlib_main_t *vm = rm->vlib_main; vlib_process_signal_event (vm, rd_cp_process_node.index, RD_CP_EVENT_INTERRUPT, 0); } static int set_address_autoconfig (u32 sw_if_index, u8 enable, u8 install_default_routes) { rd_cp_main_t *rm = &rd_cp_main; vlib_main_t *vm = rm->vlib_main; vnet_main_t *vnm = rm->vnet_main; interface_config_t *if_config; interface_config_t empty_config = { 0, 0 }; slaac_address_t *slaac_address; default_route_t *default_route; if (!enable) install_default_routes = 0; if (!vnet_sw_interface_is_api_valid (vnm, sw_if_index)) { vlib_log_warn (rm->log_class, "Invalid sw_if_index"); return 1; } if (!rm->enabled) { /* process kickoff */ interrupt_process (); rm->enabled = 1; } vec_validate_init_empty (rm->config_by_sw_if_index, sw_if_index, empty_config); if_config = &rm->config_by_sw_if_index[sw_if_index]; if (!if_config->enabled && enable) ip6_enable (sw_if_index); if ((!if_config->enabled && enable) || (!if_config->install_default_routes && install_default_routes)) router_solicitation_start_stop (sw_if_index, 1); else if (if_config->enabled && !enable) router_solicitation_start_stop (sw_if_index, 0); if (if_config->enabled && !enable) { /* *INDENT-OFF* */ pool_foreach (slaac_address, rm->slaac_address_pool, ({ remove_slaac_address (vm, slaac_address); })); /* *INDENT-ON* */ } if (if_config->install_default_routes && !install_default_routes) { /* *INDENT-OFF* */ pool_foreach (default_route, rm->default_route_pool, ({ remove_default_route (vm, default_route); })); /* *INDENT-ON* */ } if_config->enabled = enable; if_config->install_default_routes = install_default_routes; return 0; } static clib_error_t * ip6_nd_address_autoconfig (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { rd_cp_main_t *rm = &rd_cp_main; vnet_main_t *vnm = rm->vnet_main; clib_error_t *error = 0; u32 sw_if_index = ~0; u8 enable = 1; u8 default_route = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index)) ; if (unformat (input, "default-route")) default_route = 1; if (unformat (input, "disable")) enable = 0; else break; } if (sw_if_index != ~0) { if (set_address_autoconfig (sw_if_index, enable, default_route) != 0) error = clib_error_return (0, "Invalid sw_if_index"); } else error = clib_error_return (0, "Missing sw_if_index"); return error; } /*? * This command is used to enable ND address autoconfiguration * on particular interface including setting up default routes. * * @cliexpar * @parblock * Example of how to enable ND address autoconfiguration: * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0} * Example of how to enable ND address autoconfiguration * with setting up default routes: * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0 default-route} * Example of how to disable ND address autoconfiguration: * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0 disable} * @endparblock ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (ip6_nd_address_autoconfig_command, static) = { .path = "ip6 nd address autoconfig", .short_help = "ip6 nd address autoconfig <interface> [default-route|disable]", .function = ip6_nd_address_autoconfig, }; /* *INDENT-ON* */ static void vl_api_ip6_nd_address_autoconfig_t_handler (vl_api_ip6_nd_address_autoconfig_t * mp) { vl_api_ip6_nd_address_autoconfig_reply_t *rmp; u32 sw_if_index; int rv = 0; VALIDATE_SW_IF_INDEX (mp); sw_if_index = ntohl (mp->sw_if_index); rv = set_address_autoconfig (sw_if_index, mp->enable, mp->install_default_routes); BAD_SW_IF_INDEX_LABEL; REPLY_MACRO (VL_API_SW_INTERFACE_SET_TABLE_REPLY); } #define vl_msg_name_crc_list #include <vnet/ip/rd_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_rd_cp; #undef _ } static clib_error_t * rd_cp_init (vlib_main_t * vm) { rd_cp_main_t *rm = &rd_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 = rd_cp_process_node.index; rm->log_class = vlib_log_register_class ("rd_cp", 0); #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_rd_cp_msg; #undef _ /* * Set up the (msg_name, crc, message-id) table */ setup_message_id_table (am); return 0; } VLIB_INIT_FUNCTION (rd_cp_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */