/* * gre_interface.c: gre interfaces * * 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. */ /** * @file * @brief L2-GRE over IPSec tunnel interface. * * Creates ipsec-gre tunnel interface. * Provides a command line interface so humans can interact with VPP. */ #include <vnet/vnet.h> #include <vnet/pg/pg.h> #include <vnet/ipsec-gre/ipsec_gre.h> #include <vnet/ip/format.h> #include <vnet/ipsec/ipsec.h> #include <vnet/ipsec/esp.h> u8 * format_ipsec_gre_tunnel (u8 * s, va_list * args) { ipsec_gre_tunnel_t *t = va_arg (*args, ipsec_gre_tunnel_t *); ipsec_gre_main_t *gm = &ipsec_gre_main; s = format (s, "[%d] %U (src) %U (dst) local-sa %d remote-sa %d", t - gm->tunnels, format_ip4_address, &t->tunnel_src, format_ip4_address, &t->tunnel_dst, t->local_sa_id, t->remote_sa_id); return s; } static clib_error_t * show_ipsec_gre_tunnel_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { ipsec_gre_main_t *igm = &ipsec_gre_main; ipsec_gre_tunnel_t *t; if (pool_elts (igm->tunnels) == 0) vlib_cli_output (vm, "No IPSec GRE tunnels configured..."); /* *INDENT-OFF* */ pool_foreach (t, igm->tunnels, ({ vlib_cli_output (vm, "%U", format_ipsec_gre_tunnel, t); })); /* *INDENT-ON* */ return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_ipsec_gre_tunnel_command, static) = { .path = "show ipsec gre tunnel", .function = show_ipsec_gre_tunnel_command_fn, }; /* *INDENT-ON* */ /* force inclusion from application's main.c */ clib_error_t * ipsec_gre_interface_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ipsec_gre_interface_init); /** * @brief Add or delete ipsec-gre tunnel interface. * * @param *a vnet_ipsec_gre_add_del_tunnel_args_t - tunnel interface parameters * @param *sw_if_indexp u32 - software interface index * @return int - 0 if success otherwise <code>VNET_API_ERROR_</code> */ int vnet_ipsec_gre_add_del_tunnel (vnet_ipsec_gre_add_del_tunnel_args_t * a, u32 * sw_if_indexp) { ipsec_gre_main_t *igm = &ipsec_gre_main; vnet_main_t *vnm = igm->vnet_main; ip4_main_t *im = &ip4_main; ipsec_gre_tunnel_t *t; vnet_hw_interface_t *hi; u32 hw_if_index, sw_if_index; u32 slot; uword *p; u64 key; ipsec_add_del_ipsec_gre_tunnel_args_t args; memset (&args, 0, sizeof (args)); args.is_add = a->is_add; args.local_sa_id = a->lsa; args.remote_sa_id = a->rsa; args.local_ip.as_u32 = a->src.as_u32; args.remote_ip.as_u32 = a->dst.as_u32; key = (u64) a->src.as_u32 << 32 | (u64) a->dst.as_u32; p = hash_get (igm->tunnel_by_key, key); if (a->is_add) { /* check if same src/dst pair exists */ if (p) return VNET_API_ERROR_INVALID_VALUE; pool_get_aligned (igm->tunnels, t, CLIB_CACHE_LINE_BYTES); memset (t, 0, sizeof (*t)); if (vec_len (igm->free_ipsec_gre_tunnel_hw_if_indices) > 0) { vnet_interface_main_t *im = &vnm->interface_main; hw_if_index = igm->free_ipsec_gre_tunnel_hw_if_indices [vec_len (igm->free_ipsec_gre_tunnel_hw_if_indices) - 1]; _vec_len (igm->free_ipsec_gre_tunnel_hw_if_indices) -= 1; hi = vnet_get_hw_interface (vnm, hw_if_index); hi->dev_instance = t - igm->tunnels; hi->hw_instance = hi->dev_instance; /* clear old stats of freed tunnel before reuse */ sw_if_index = hi->sw_if_index; vnet_interface_counter_lock (im); vlib_zero_combined_counter (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX], sw_if_index); vlib_zero_combined_counter (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], sw_if_index); vlib_zero_simple_counter (&im->sw_if_counters[VNET_INTERFACE_COUNTER_DROP], sw_if_index); vnet_interface_counter_unlock (im); } else { hw_if_index = vnet_register_interface (vnm, ipsec_gre_device_class.index, t - igm->tunnels, ipsec_gre_hw_interface_class.index, t - igm->tunnels); hi = vnet_get_hw_interface (vnm, hw_if_index); sw_if_index = hi->sw_if_index; } t->hw_if_index = hw_if_index; t->sw_if_index = sw_if_index; t->local_sa_id = a->lsa; t->remote_sa_id = a->rsa; t->local_sa = ipsec_get_sa_index_by_sa_id (a->lsa); t->remote_sa = ipsec_get_sa_index_by_sa_id (a->rsa); ip4_sw_interface_enable_disable (sw_if_index, 1); vec_validate_init_empty (igm->tunnel_index_by_sw_if_index, sw_if_index, ~0); igm->tunnel_index_by_sw_if_index[sw_if_index] = t - igm->tunnels; vec_validate (im->fib_index_by_sw_if_index, sw_if_index); hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t) + sizeof (esp_header_t) + sizeof (esp_footer_t); hi->per_packet_overhead_bytes = /* preamble */ 8 + /* inter frame gap */ 12; /* Standard default gre MTU. */ hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000; clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src)); clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst)); hash_set (igm->tunnel_by_key, key, t - igm->tunnels); slot = vlib_node_add_named_next_with_slot (vnm->vlib_main, hi->tx_node_index, "esp-encrypt", IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT); ASSERT (slot == IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT); } else { /* !is_add => delete */ /* tunnel needs to exist */ if (!p) return VNET_API_ERROR_NO_SUCH_ENTRY; t = pool_elt_at_index (igm->tunnels, p[0]); sw_if_index = t->sw_if_index; ip4_sw_interface_enable_disable (sw_if_index, 0); vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */ ); /* make sure tunnel is removed from l2 bd or xconnect */ set_int_l2_mode (igm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0); vec_add1 (igm->free_ipsec_gre_tunnel_hw_if_indices, t->hw_if_index); igm->tunnel_index_by_sw_if_index[sw_if_index] = ~0; hash_unset (igm->tunnel_by_key, key); pool_put (igm->tunnels, t); } if (sw_if_indexp) *sw_if_indexp = sw_if_index; return ipsec_add_del_ipsec_gre_tunnel (vnm, &args); } static clib_error_t * create_ipsec_gre_tunnel_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { unformat_input_t _line_input, *line_input = &_line_input; u8 is_add = 1; u32 num_m_args = 0; ip4_address_t src, dst; u32 lsa = 0, rsa = 0; vnet_ipsec_gre_add_del_tunnel_args_t _a, *a = &_a; int rv; u32 sw_if_index; clib_error_t *error = NULL; /* Get a line of input. */ if (!unformat_user (input, unformat_line_input, line_input)) return 0; while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "del")) is_add = 0; else if (unformat (line_input, "src %U", unformat_ip4_address, &src)) num_m_args++; else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst)) num_m_args++; else if (unformat (line_input, "local-sa %d", &lsa)) num_m_args++; else if (unformat (line_input, "remote-sa %d", &rsa)) num_m_args++; else { error = clib_error_return (0, "unknown input `%U'", format_unformat_error, line_input); goto done; } } if (num_m_args < 4) { error = clib_error_return (0, "mandatory argument(s) missing"); goto done; } if (memcmp (&src, &dst, sizeof (src)) == 0) { error = clib_error_return (0, "src and dst are identical"); goto done; } memset (a, 0, sizeof (*a)); a->is_add = is_add; a->lsa = lsa; a->rsa = rsa; clib_memcpy (&a->src, &src, sizeof (src)); clib_memcpy (&a->dst, &dst, sizeof (dst)); rv = vnet_ipsec_gre_add_del_tunnel (a, &sw_if_index); switch (rv) { case 0: vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main (), sw_if_index); break; case VNET_API_ERROR_INVALID_VALUE: error = clib_error_return (0, "GRE tunnel already exists..."); goto done; default: error = clib_error_return (0, "vnet_ipsec_gre_add_del_tunnel returned %d", rv); goto done; } done: unformat_free (line_input); return error; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (create_ipsec_gre_tunnel_command, static) = { .path = "create ipsec gre tunnel", .short_help = "create ipsec gre tunnel src <addr> dst <addr> " "local-sa <id> remote-sa <id> [del]", .function = create_ipsec_gre_tunnel_command_fn, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */