/* * decap.c: pppoe session decap packet processing * * 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 implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <vlib/vlib.h> #include <vnet/pg/pg.h> #include <vnet/ppp/packet.h> #include <pppoe/pppoe.h> typedef struct { u32 next_index; u32 session_index; u32 session_id; u32 error; } pppoe_rx_trace_t; static u8 * format_pppoe_rx_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_rx_trace_t * t = va_arg (*args, pppoe_rx_trace_t *); if (t->session_index != ~0) { s = format (s, "PPPoE decap from pppoe_session%d session_id %d next %d error %d", t->session_index, t->session_id, t->next_index, t->error); } else { s = format (s, "PPPoE decap error - session for session_id %d does not exist", t->session_id); } return s; } static uword pppoe_input (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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t * b0, * b1; u32 next0, next1; ethernet_header_t *h0, *h1; pppoe_header_t * pppoe0, * pppoe1; u16 ppp_proto0 = 0, ppp_proto1 = 0; pppoe_session_t * t0, * t1; u32 error0, error1; u32 sw_if_index0, sw_if_index1, len0, len1; pppoe_entry_key_t key0, key1; pppoe_entry_result_t result0, result1; u32 bucket0, bucket1; /* Prefetch next iteration. */ { vlib_buffer_t * p2, * p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); } bi0 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); error0 = 0; error1 = 0; /* leaves current_data pointing at the pppoe header */ pppoe0 = vlib_buffer_get_current (b0); pppoe1 = vlib_buffer_get_current (b1); ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto); ppp_proto1 = clib_net_to_host_u16(pppoe1->ppp_proto); /* Manipulate packet 0 */ if ((ppp_proto0 != PPP_PROTOCOL_ip4) && (ppp_proto0 != PPP_PROTOCOL_ip6)) { error0 = PPPOE_ERROR_CONTROL_PLANE; next0 = PPPOE_INPUT_NEXT_CP_INPUT; goto trace0; } /* get client mac */ vlib_buffer_reset(b0); h0 = vlib_buffer_get_current (b0); pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result, h0->src_address, pppoe0->session_id, &key0, &bucket0, &result0); if (PREDICT_FALSE (result0.fields.session_index == ~0)) { error0 = PPPOE_ERROR_NO_SUCH_SESSION; next0 = PPPOE_INPUT_NEXT_DROP; goto trace0; } t0 = pool_elt_at_index (pem->sessions, result0.fields.session_index); /* Pop Eth and PPPoE header */ vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0)); next0 = (ppp_proto0==PPP_PROTOCOL_ip4)? PPPOE_INPUT_NEXT_IP4_INPUT : PPPOE_INPUT_NEXT_IP6_INPUT; sw_if_index0 = t0->sw_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 (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 = sw_if_index0; } trace0: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { pppoe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->session_index = result0.fields.session_index; tr->session_id = clib_net_to_host_u32(pppoe0->session_id); } /* Manipulate packet 1 */ if ((ppp_proto1 != PPP_PROTOCOL_ip4) && (ppp_proto1 != PPP_PROTOCOL_ip6)) { error1 = PPPOE_ERROR_CONTROL_PLANE; next1 = PPPOE_INPUT_NEXT_CP_INPUT; goto trace1; } /* get client mac */ vlib_buffer_reset(b1); h1 = vlib_buffer_get_current (b1); pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result, h1->src_address, pppoe1->session_id, &key1, &bucket1, &result1); if (PREDICT_FALSE (result1.fields.session_index == ~0)) { error1 = PPPOE_ERROR_NO_SUCH_SESSION; next1 = PPPOE_INPUT_NEXT_DROP; goto trace1; } t1 = pool_elt_at_index (pem->sessions, result1.fields.session_index); /* Pop Eth and PPPoE header */ vlib_buffer_advance(b1, sizeof(*h1)+sizeof(*pppoe1)); next1 = (ppp_proto1==PPP_PROTOCOL_ip4)? PPPOE_INPUT_NEXT_IP4_INPUT : PPPOE_INPUT_NEXT_IP6_INPUT; sw_if_index1 = t1->sw_if_index; len1 = vlib_buffer_length_in_chain (vm, b1); pkts_decapsulated ++; stats_n_packets += 1; stats_n_bytes += len1; /* Batch stats increment on the same pppoe session so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len1; 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 = len1; stats_sw_if_index = sw_if_index1; } trace1: b1->error = error1 ? node->errors[error1] : 0; if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { pppoe_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->next_index = next1; tr->error = error1; tr->session_index = result1.fields.session_index; tr->session_id = clib_net_to_host_u32(pppoe1->session_id); } vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0; ethernet_header_t *h0; pppoe_header_t * pppoe0; u16 ppp_proto0 = 0; pppoe_session_t * t0; u32 error0; u32 sw_if_index0, len0; pppoe_entry_key_t key0; pppoe_entry_result_t result0; u32 bucket0; 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); error0 = 0; /* leaves current_data pointing at the pppoe header */ pppoe0 = vlib_buffer_get_current (b0); ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto); if ((ppp_proto0 != PPP_PROTOCOL_ip4) && (ppp_proto0 != PPP_PROTOCOL_ip6)) { error0 = PPPOE_ERROR_CONTROL_PLANE; next0 = PPPOE_INPUT_NEXT_CP_INPUT; goto trace00; } /* get client mac */ vlib_buffer_reset(b0); h0 = vlib_buffer_get_current (b0); pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result, h0->src_address, pppoe0->session_id, &key0, &bucket0, &result0); if (PREDICT_FALSE (result0.fields.session_index == ~0)) { error0 = PPPOE_ERROR_NO_SUCH_SESSION; next0 = PPPOE_INPUT_NEXT_DROP; goto trace00; } t0 = pool_elt_at_index (pem->sessions, result0.fields.session_index); /* Pop Eth and PPPoE header */ vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0)); next0 = (ppp_proto0==PPP_PROTOCOL_ip4)? PPPOE_INPUT_NEXT_IP4_INPUT : PPPOE_INPUT_NEXT_IP6_INPUT; sw_if_index0 = t0->sw_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 (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 = sw_if_index0; } trace00: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { pppoe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->session_index = result0.fields.session_index; tr->session_id = clib_net_to_host_u16(pppoe0->session_id); } 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; } static char * pppoe_error_strings[] = { #define pppoe_error(n,s) s, #include <pppoe/pppoe_error.def> #undef pppoe_error #undef _ }; VLIB_REGISTER_NODE (pppoe_input_node) = { .function = pppoe_input, .name = "pppoe-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = PPPOE_N_ERROR, .error_strings = pppoe_error_strings, .n_next_nodes = PPPOE_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [PPPOE_INPUT_NEXT_##s] = n, foreach_pppoe_input_next #undef _ }, .format_trace = format_pppoe_rx_trace, }; VLIB_NODE_FUNCTION_MULTIARCH (pppoe_input_node, pppoe_input)