/* * Copyright (c) 2015 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. */ /* * srp_interface.c: srp interfaces * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <vnet/vnet.h> #include <vnet/pg/pg.h> #include <vnet/srp/srp.h> static u8* srp_build_rewrite (vnet_main_t * vnm, u32 sw_if_index, vnet_link_t link_type, const void * dst_address) { vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index); srp_main_t * sm = &srp_main; srp_and_ethernet_header_t * h; u8* rewrite = NULL; u16 type; uword n_bytes = sizeof (h[0]); switch (link_type) { #define _(a,b) case VNET_LINK_##a: type = ETHERNET_TYPE_##b; break _ (IP4, IP4); _ (IP6, IP6); _ (MPLS, MPLS); _ (ARP, ARP); #undef _ default: return (NULL); } vec_validate(rewrite, n_bytes-1); h = (srp_and_ethernet_header_t *)rewrite; clib_memcpy (h->ethernet.src_address, hw->hw_address, sizeof (h->ethernet.src_address)); if (dst_address) clib_memcpy (h->ethernet.dst_address, dst_address, sizeof (h->ethernet.dst_address)); else clib_memset (h->ethernet.dst_address, ~0, sizeof (h->ethernet.dst_address)); /* broadcast */ h->ethernet.type = clib_host_to_net_u16 (type); h->srp.as_u16 = 0; h->srp.mode = SRP_MODE_data; h->srp.ttl = sm->default_data_ttl; srp_header_compute_parity (&h->srp); return (rewrite); } static void srp_register_interface_helper (u32 * hw_if_indices_by_side, u32 redistribute); void serialize_srp_main (serialize_main_t * m, va_list * va) { srp_main_t * sm = &srp_main; srp_interface_t * si; serialize_integer (m, pool_elts (sm->interface_pool), sizeof (u32)); pool_foreach (si, sm->interface_pool) { serialize_integer (m, si->rings[SRP_RING_OUTER].hw_if_index, sizeof (u32)); serialize_integer (m, si->rings[SRP_RING_INNER].hw_if_index, sizeof (u32)); } } void unserialize_srp_main (serialize_main_t * m, va_list * va) { u32 i, n_ifs, hw_if_indices[SRP_N_RING]; unserialize_integer (m, &n_ifs, sizeof (u32)); for (i = 0; i < n_ifs; i++) { unserialize_integer (m, &hw_if_indices[SRP_RING_OUTER], sizeof (u32)); unserialize_integer (m, &hw_if_indices[SRP_RING_INNER], sizeof (u32)); srp_register_interface_helper (hw_if_indices, /* redistribute */ 0); } } static void srp_register_interface_helper (u32 * hw_if_indices_by_side, u32 redistribute) { vnet_main_t * vnm = vnet_get_main(); srp_main_t * sm = &srp_main; srp_interface_t * si; vnet_hw_interface_t * hws[SRP_N_RING]; uword s, * p; /* Check if interface has already been registered. */ p = hash_get (sm->interface_index_by_hw_if_index, hw_if_indices_by_side[0]); if (p) { si = pool_elt_at_index (sm->interface_pool, p[0]); } else { pool_get (sm->interface_pool, si); clib_memset (si, 0, sizeof (si[0])); } for (s = 0; s < SRP_N_SIDE; s++) { hws[s] = vnet_get_hw_interface (vnm, hw_if_indices_by_side[s]); si->rings[s].ring = s; si->rings[s].hw_if_index = hw_if_indices_by_side[s]; si->rings[s].sw_if_index = hws[s]->sw_if_index; hash_set (sm->interface_index_by_hw_if_index, hw_if_indices_by_side[s], si - sm->interface_pool); } /* Inherit MAC address from outer ring. */ clib_memcpy (si->my_address, hws[SRP_RING_OUTER]->hw_address, vec_len (hws[SRP_RING_OUTER]->hw_address)); /* Default time to wait to restore signal. */ si->config.wait_to_restore_idle_delay = 60; si->config.ips_tx_interval = 1; } void srp_register_interface (u32 * hw_if_indices_by_side) { srp_register_interface_helper (hw_if_indices_by_side, /* redistribute */ 1); } void srp_interface_set_hw_wrap_function (u32 hw_if_index, srp_hw_wrap_function_t * f) { srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); si->hw_wrap_function = f; } void srp_interface_set_hw_enable_function (u32 hw_if_index, srp_hw_enable_function_t * f) { srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); si->hw_enable_function = f; } void srp_interface_enable_ips (u32 hw_if_index) { srp_main_t * sm = &srp_main; srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); si->ips_process_enable = 1; vlib_node_set_state (sm->vlib_main, srp_ips_process_node.index, VLIB_NODE_STATE_POLLING); } static uword srp_is_valid_class_for_interface (vnet_main_t * vnm, u32 hw_if_index, u32 hw_class_index) { srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); if (! si) return 0; /* Both sides must be admin down. */ if (vnet_sw_interface_is_admin_up (vnm, si->rings[SRP_RING_OUTER].sw_if_index)) return 0; if (vnet_sw_interface_is_admin_up (vnm, si->rings[SRP_RING_INNER].sw_if_index)) return 0; return 1; } static void srp_interface_hw_class_change (vnet_main_t * vnm, u32 hw_if_index, u32 old_hw_class_index, u32 new_hw_class_index) { srp_main_t * sm = &srp_main; srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); vnet_hw_interface_t * hi; vnet_device_class_t * dc; u32 r, to_srp; if (!si) { clib_warning ("srp interface no set si = 0"); return; } to_srp = new_hw_class_index == srp_hw_interface_class.index; /* Changing class on either outer or inner rings implies changing the class of the other. */ for (r = 0; r < SRP_N_RING; r++) { srp_interface_ring_t * ir = &si->rings[r]; hi = vnet_get_hw_interface (vnm, ir->hw_if_index); dc = vnet_get_device_class (vnm, hi->dev_class_index); /* hw_if_index itself will be handled by caller. */ if (ir->hw_if_index != hw_if_index) { vnet_hw_interface_init_for_class (vnm, ir->hw_if_index, new_hw_class_index, to_srp ? si - sm->interface_pool : ~0); if (dc->hw_class_change) dc->hw_class_change (vnm, ir->hw_if_index, new_hw_class_index); } else hi->hw_instance = to_srp ? si - sm->interface_pool : ~0; } if (si->hw_enable_function) si->hw_enable_function (si, /* enable */ to_srp); } VNET_HW_INTERFACE_CLASS (srp_hw_interface_class) = { .name = "SRP", .format_address = format_ethernet_address, .format_header = format_srp_header_with_length, .format_device = format_srp_device, .unformat_hw_address = unformat_ethernet_address, .unformat_header = unformat_srp_header, .build_rewrite = srp_build_rewrite, .update_adjacency = ethernet_update_adjacency, .is_valid_class_for_interface = srp_is_valid_class_for_interface, .hw_class_change = srp_interface_hw_class_change, }; void srp_interface_get_interface_config (u32 hw_if_index, srp_interface_config_t * c) { srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); ASSERT (si != 0); c[0] = si->config; } void srp_interface_set_interface_config (u32 hw_if_index, srp_interface_config_t * c) { srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index); ASSERT (si != 0); if (memcmp (&si->config, &c[0], sizeof (c[0]))) { si->config = c[0]; } } #if DEBUG > 0 #define VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT VNET_INTERFACE_TX_N_NEXT /* Echo packets back to srp input. */ static uword simulated_srp_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, n_left_to_next, n_copy, * from, * to_next; u32 next_index = VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT; u32 i; vlib_buffer_t * b; n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); n_copy = clib_min (n_left_from, n_left_to_next); clib_memcpy_fast (to_next, from, n_copy * sizeof (from[0])); n_left_to_next -= n_copy; n_left_from -= n_copy; for (i = 0; i < n_copy; i++) { b = vlib_get_buffer (vm, from[i]); /* TX interface will be fake eth; copy to RX for benefit of srp-input. */ b->sw_if_index[VLIB_RX] = b->sw_if_index[VLIB_TX]; } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return n_left_from; } static u8 * format_simulated_srp_name (u8 * s, va_list * args) { u32 dev_instance = va_arg (*args, u32); return format (s, "fake-srp%d", dev_instance); } VNET_DEVICE_CLASS (srp_simulated_device_class,static) = { .name = "Simulated srp", .format_device_name = format_simulated_srp_name, .tx_function = simulated_srp_interface_tx, }; static clib_error_t * create_simulated_srp_interfaces (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t * vnm = vnet_get_main(); u8 address[6]; u32 hw_if_index; vnet_hw_interface_t * hi; static u32 instance; if (! unformat_user (input, unformat_ethernet_address, &address)) { clib_memset (address, 0, sizeof (address)); address[0] = 0xde; address[1] = 0xad; address[5] = instance; } hw_if_index = vnet_register_interface (vnm, srp_simulated_device_class.index, instance++, srp_hw_interface_class.index, 0); hi = vnet_get_hw_interface (vnm, hw_if_index); srp_setup_node (vm, hi->output_node_index); hi->min_packet_bytes = 40 + 16; /* Standard default ethernet MTU. */ vnet_sw_interface_set_mtu (vnm, sw_if_index, 1500); vec_free (hi->hw_address); vec_add (hi->hw_address, address, sizeof (address)); { uword slot; slot = vlib_node_add_named_next_with_slot (vm, hi->tx_node_index, "srp-input", VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT); ASSERT (slot == VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT); } return /* no error */ 0; } static VLIB_CLI_COMMAND (create_simulated_srp_interface_command) = { .path = "srp create-interfaces", .short_help = "Create simulated srp interface", .function = create_simulated_srp_interfaces, }; #endif