diff options
Diffstat (limited to 'src/plugins/pppoe/pppoe_tap_node.c')
| -rw-r--r-- | src/plugins/pppoe/pppoe_tap_node.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/src/plugins/pppoe/pppoe_tap_node.c b/src/plugins/pppoe/pppoe_tap_node.c new file mode 100644 index 00000000000..f1e0a50103f --- /dev/null +++ b/src/plugins/pppoe/pppoe_tap_node.c @@ -0,0 +1,297 @@ +/* + *------------------------------------------------------------------ + * 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) + |