diff options
Diffstat (limited to 'src/vnet/ipsec-gre/interface.c')
| -rw-r--r-- | src/vnet/ipsec-gre/interface.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/src/vnet/ipsec-gre/interface.c b/src/vnet/ipsec-gre/interface.c new file mode 100644 index 00000000..0772ce73 --- /dev/null +++ b/src/vnet/ipsec-gre/interface.c @@ -0,0 +1,319 @@ +/* + * 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: +*/ |