/* *------------------------------------------------------------------ * Copyright (c) 2017 Intel 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 pemplied. * See the License for the specific language governing permissions and * lpemitations under the License. *------------------------------------------------------------------ */ #include <vlib/vlib.h> #include <vnet/ppp/packet.h> #include <pppoe/pppoe.h> vlib_node_registration_t pppoe_tap_dispatch_node; #define foreach_pppoe_tap_next \ _(DROP, "error-drop") \ _(TUNTAP, "tuntap-tx" ) \ _(INTERFACE, "interface-output" ) \ typedef enum { #define _(s,n) PPPOE_TAP_NEXT_##s, foreach_pppoe_tap_next #undef _ PPPOE_TAP_N_NEXT, } pppoe_tap_next_t; typedef struct { u32 next_index; u32 sw_if_index; u32 tap_if_index; u8 pppoe_code; u16 ppp_proto; u32 error; } pppoe_tap_trace_t; static u8 * format_pppoe_tap_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); pppoe_tap_trace_t * t = va_arg (*args, pppoe_tap_trace_t *); pppoe_main_t * pem = &pppoe_main; if (t->sw_if_index != pem->tap_if_index) { s = format (s, "PPPoE dispatch from sw_if_index %d next %d error %d \n" " pppoe_code 0x%x ppp_proto 0x%x", t->sw_if_index, t->next_index, t->error, t->pppoe_code, t->ppp_proto); } else { s = format (s, "PPPoE dispatch from tap_if_index %d next %d error %d \n" " pppoe_code 0x%x ppp_proto 0x%x", t->tap_if_index, t->next_index, t->error, t->pppoe_code, t->ppp_proto); } return s; } /** * Perform learning on one packet based on the mac table lookup result. * */ static_always_inline void pppoe_learn_process (vlib_node_runtime_t * node, pppoe_main_t * pem, vlib_buffer_t * b0, u32 sw_if_index0, pppoe_entry_key_t * key0, pppoe_entry_key_t * cached_key, u32 * bucket0, pppoe_entry_result_t * result0) { /* Check mac table lookup result */ if (PREDICT_TRUE (result0->fields.sw_if_index == sw_if_index0)) { /* * The entry was in the table, and the sw_if_index matched, the normal case */ return; } else if (result0->fields.sw_if_index == ~0) { /* The entry was not in table, so add it */ result0->fields.sw_if_index = sw_if_index0; result0->fields.session_index = ~0; cached_key->raw = ~0; /* invalidate the cache */ } else { /* The entry was in the table, but with the wrong sw_if_index mapping (mac move) */ result0->fields.sw_if_index = sw_if_index0; } /* Update the entry */ BVT (clib_bihash_kv) kv; kv.key = key0->raw; kv.value = result0->raw; BV (clib_bihash_add_del) (&pem->session_table, &kv, 1 /* is_add */ ); } static uword pppoe_tap_dispatch (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, next_index, * from, * to_next; pppoe_main_t * pem = &pppoe_main; vnet_main_t * vnm = pem->vnet_main; vnet_interface_main_t * im = &vnm->interface_main; u32 pkts_decapsulated = 0; u32 thread_index = vlib_get_thread_index(); u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; pppoe_entry_key_t cached_key; pppoe_entry_result_t cached_result; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; /* Clear the one-entry cache in case session table was updated */ cached_key.raw = ~0; cached_result.raw = ~0; /* warning be gone */ next_index = node->cached_next_index; stats_sw_if_index = node->runtime_data[0]; stats_n_packets = stats_n_bytes = 0; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; ethernet_header_t *h0; pppoe_header_t * pppoe0; pppoe_entry_key_t key0; pppoe_entry_result_t result0; u32 bucket0; u32 next0; u32 error0 = 0; u32 rx_sw_if_index0=~0, tx_sw_if_index0=~0, len0; vnet_hw_interface_t *hi; vnet_sw_interface_t *si; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); /* leaves current_data pointing at the pppoe header */ pppoe0 = vlib_buffer_get_current (b0); rx_sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; if (PREDICT_FALSE (pppoe0->ver_type != PPPOE_VER_TYPE)) { error0 = PPPOE_ERROR_BAD_VER_TYPE; next0 = PPPOE_INPUT_NEXT_DROP; goto trace00; } vlib_buffer_reset(b0); h0 = vlib_buffer_get_current (b0); if(rx_sw_if_index0 == pem->tap_if_index) { pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result, h0->dst_address, 0, &key0, &bucket0, &result0); tx_sw_if_index0 = result0.fields.sw_if_index; if (PREDICT_FALSE (tx_sw_if_index0 == ~0)) { error0 = PPPOE_ERROR_NO_SUCH_SESSION; next0 = PPPOE_INPUT_NEXT_DROP; goto trace00; } next0 = PPPOE_TAP_NEXT_INTERFACE; vnet_buffer(b0)->sw_if_index[VLIB_TX] = tx_sw_if_index0; /* set src mac address */ si = vnet_get_sw_interface(vnm, tx_sw_if_index0); hi = vnet_get_hw_interface (vnm, si->hw_if_index); clib_memcpy (vlib_buffer_get_current (b0)+6, hi->hw_address, 6); } else { pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result, h0->src_address, pppoe0->session_id, &key0, &bucket0, &result0); tx_sw_if_index0 = result0.fields.sw_if_index; /* learn client session */ pppoe_learn_process (node, pem, b0, rx_sw_if_index0, &key0, &cached_key, &bucket0, &result0); next0 = PPPOE_TAP_NEXT_TUNTAP; vnet_buffer(b0)->sw_if_index[VLIB_TX] = pem->tap_if_index; } len0 = vlib_buffer_length_in_chain (vm, b0); pkts_decapsulated ++; stats_n_packets += 1; stats_n_bytes += len0; /* Batch stats increment on the same pppoe session so counter is not incremented per packet */ if (PREDICT_FALSE (rx_sw_if_index0 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len0; if (stats_n_packets) vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len0; stats_sw_if_index = rx_sw_if_index0; } trace00: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { pppoe_tap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->sw_if_index = tx_sw_if_index0; tr->tap_if_index = pem->tap_if_index; tr->pppoe_code = pppoe0->code; tr->ppp_proto = clib_net_to_host_u16(pppoe0->ppp_proto); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } /* Do we still need this now that session tx stats is kept? */ vlib_node_increment_counter (vm, pppoe_input_node.index, PPPOE_ERROR_DECAPSULATED, pkts_decapsulated); /* Increment any remaining batch stats */ if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); node->runtime_data[0] = stats_sw_if_index; } return from_frame->n_vectors; } VLIB_REGISTER_NODE (pppoe_tap_dispatch_node) = { .function = pppoe_tap_dispatch, .name = "pppoe-tap-dispatch", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_next_nodes = PPPOE_TAP_N_NEXT, .next_nodes = { #define _(s,n) [PPPOE_TAP_NEXT_##s] = n, foreach_pppoe_tap_next #undef _ }, .format_trace = format_pppoe_tap_trace, }; VLIB_NODE_FUNCTION_MULTIARCH (pppoe_tap_dispatch_node, pppoe_tap_dispatch)