diff options
Diffstat (limited to 'src/plugins/pppoe/pppoe_encap.c')
| -rw-r--r-- | src/plugins/pppoe/pppoe_encap.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/src/plugins/pppoe/pppoe_encap.c b/src/plugins/pppoe/pppoe_encap.c new file mode 100644 index 00000000000..69bec61dec1 --- /dev/null +++ b/src/plugins/pppoe/pppoe_encap.c @@ -0,0 +1,384 @@ +/* + * 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 <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <pppoe/pppoe.h> + +/* Statistics (not all errors) */ +#define foreach_pppoe_encap_error \ +_(ENCAPSULATED, "good packets encapsulated") + +static char * pppoe_encap_error_strings[] = { +#define _(sym,string) string, + foreach_pppoe_encap_error +#undef _ +}; + +typedef enum { +#define _(sym,str) PPPOE_ENCAP_ERROR_##sym, + foreach_pppoe_encap_error +#undef _ + PPPOE_ENCAP_N_ERROR, +} pppoe_encap_error_t; + +#define foreach_pppoe_encap_next \ +_(DROP, "error-drop") \ +_(INTERFACE, "interface-output" ) \ + +typedef enum +{ +#define _(s,n) PPPOE_ENCAP_NEXT_##s, + foreach_pppoe_encap_next +#undef _ + PPPOE_ENCAP_N_NEXT, +} pppoe_encap_next_t; + +typedef struct { + u32 session_index; + u32 session_id; +} pppoe_encap_trace_t; + +u8 * format_pppoe_encap_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_encap_trace_t * t + = va_arg (*args, pppoe_encap_trace_t *); + + s = format (s, "PPPOE encap to pppoe_session%d session_id %d", + t->session_index, t->session_id); + return s; +} + + +#define foreach_fixed_header2_offset \ + _(0) _(1) + + +static uword +pppoe_encap (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_encapsulated = 0; + u32 thread_index = vlib_get_thread_index(); + u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; + u32 sw_if_index0 = 0, sw_if_index1 = 0; + u32 next0 = 0, next1 = 0; + pppoe_session_t * t0 = NULL, * t1 = NULL; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + 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 len0, len1; + ethernet_header_t * eth0, * eth1; + pppoe_header_t * pppoe0, * pppoe1; + u64 * copy_src0, * copy_dst0; + u64 * copy_src1, * copy_dst1; + u16 * copy_src_last0, * copy_dst_last0; + u16 * copy_src_last1, * copy_dst_last1; + u16 new_l0, new_l1; + u32 session_id0, session_id1; + + /* 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); + + /* Get next node index and if-index from session */ + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; + session_id0 = pem->session_index_by_sw_if_index[sw_if_index0]; + t0 = pool_elt_at_index(pem->sessions, session_id0); + next0 = PPPOE_ENCAP_NEXT_INTERFACE; + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_if_index; + + /* Get next node index and if-index from session */ + sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX]; + session_id1 = pem->session_index_by_sw_if_index[sw_if_index1]; + t1 = pool_elt_at_index(pem->sessions, session_id1); + next1 = PPPOE_ENCAP_NEXT_INTERFACE; + vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_if_index; + + /* Apply the rewrite string. $$$$ vnet_rewrite? */ + vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite)); + vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite)); + + eth0 = (ethernet_header_t *)(vlib_buffer_get_current(b0)); + eth1 = (ethernet_header_t *)(vlib_buffer_get_current(b1)); + + /* Copy the fixed header */ + copy_dst0 = (u64 *) eth0; + copy_src0 = (u64 *) t0->rewrite; + copy_dst1 = (u64 *) eth1; + copy_src1 = (u64 *) t1->rewrite; + /* Copy first 8-bytes at a time */ +#define _(offs) copy_dst0[offs] = copy_src0[offs]; + foreach_fixed_header2_offset; +#undef _ + /* Last 6 octets. Hopefully gcc will be our friend */ + copy_dst_last0 = (u16 *)(©_dst0[2]); + copy_src_last0 = (u16 *)(©_src0[2]); + copy_dst_last0[0] = copy_src_last0[0]; + copy_dst_last0[1] = copy_src_last0[1]; + copy_dst_last0[2] = copy_src_last0[2]; + +#define _(offs) copy_dst1[offs] = copy_src1[offs]; + foreach_fixed_header2_offset; +#undef _ + /* Last 6 octets. Hopefully gcc will be our friend */ + copy_dst_last1 = (u16 *)(©_dst1[2]); + copy_src_last1 = (u16 *)(©_src1[2]); + copy_dst_last1[0] = copy_src_last1[0]; + copy_dst_last1[1] = copy_src_last1[1]; + copy_dst_last1[2] = copy_src_last1[2]; + + /* Fix PPPoE length */ + new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0) + - sizeof (*pppoe0) - sizeof(*eth0)); + pppoe0 = (pppoe_header_t *)(eth0 + 1); + pppoe0->length = new_l0; + + new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1) + - sizeof (*pppoe1) - sizeof(*eth1)); + pppoe1 = (pppoe_header_t *)(eth1 + 1); + pppoe1->length = new_l1; + + pkts_encapsulated += 2; + len0 = vlib_buffer_length_in_chain (vm, b0); + len1 = vlib_buffer_length_in_chain (vm, b1); + stats_n_packets += 2; + stats_n_bytes += len0 + len1; + + /* Batch stats increment on the same pppoe session so counter is not + incremented per packet. Note stats are still incremented for deleted + and admin-down session where packets are dropped. It is not worthwhile + to check for this rare case and affect normal path performance. */ + if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) || + (sw_if_index1 != stats_sw_if_index))) + { + stats_n_packets -= 2; + stats_n_bytes -= len0 + len1; + if (sw_if_index0 == sw_if_index1) + { + if (stats_n_packets) + vlib_increment_combined_counter + (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, + thread_index, stats_sw_if_index, + stats_n_packets, stats_n_bytes); + stats_sw_if_index = sw_if_index0; + stats_n_packets = 2; + stats_n_bytes = len0 + len1; + } + else + { + vlib_increment_combined_counter + (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, + thread_index, sw_if_index0, 1, len0); + vlib_increment_combined_counter + (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, + thread_index, sw_if_index1, 1, len1); + } + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + pppoe_encap_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->session_index = t0 - pem->sessions; + tr->session_id = t0->session_id; + } + + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + pppoe_encap_trace_t *tr = + vlib_add_trace (vm, node, b1, sizeof (*tr)); + tr->session_index = t1 - pem->sessions; + tr->session_id = t1->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; + ethernet_header_t * eth0; + pppoe_header_t * pppoe0; + u64 * copy_src0, * copy_dst0; + u16 * copy_src_last0, * copy_dst_last0; + u16 new_l0; + u32 len0; + u32 session_id0; + + 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); + + /* Get next node index and if-index from session */ + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; + session_id0 = pem->session_index_by_sw_if_index[sw_if_index0]; + t0 = pool_elt_at_index(pem->sessions, session_id0); + next0 = PPPOE_ENCAP_NEXT_INTERFACE; + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_if_index; + + /* Apply the rewrite string. $$$$ vnet_rewrite? */ + vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite)); + + eth0 = (ethernet_header_t *)(vlib_buffer_get_current(b0)); + /* Copy the fixed header */ + copy_dst0 = (u64 *) eth0; + copy_src0 = (u64 *) t0->rewrite; + + /* Copy first 8-bytes at a time */ +#define _(offs) copy_dst0[offs] = copy_src0[offs]; + foreach_fixed_header2_offset; +#undef _ + /* Last 6 octets. Hopefully gcc will be our friend */ + copy_dst_last0 = (u16 *)(©_dst0[2]); + copy_src_last0 = (u16 *)(©_src0[2]); + copy_dst_last0[0] = copy_src_last0[0]; + copy_dst_last0[1] = copy_src_last0[1]; + copy_dst_last0[2] = copy_src_last0[2]; + + /* Fix PPPoE length */ + new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0) + - sizeof (*pppoe0) - sizeof(*eth0)); + pppoe0 = (pppoe_header_t *)(eth0 + 1); + pppoe0->length = new_l0; + + pkts_encapsulated ++; + len0 = vlib_buffer_length_in_chain (vm, b0); + stats_n_packets += 1; + stats_n_bytes += len0; + + /* Batch stats increment on the same pppoe session so counter is not + incremented per packet. Note stats are still incremented for deleted + and admin-down session where packets are dropped. It is not worthwhile + to check for this rare case and affect normal path performance. */ + 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_TX, + 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; + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + pppoe_encap_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->session_index = t0 - pem->sessions; + tr->session_id = t0->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, node->node_index, + PPPOE_ENCAP_ERROR_ENCAPSULATED, + pkts_encapsulated); + + /* Increment any remaining batch stats */ + if (stats_n_packets) + { + vlib_increment_combined_counter + (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, + 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_encap_node) = { + .function = pppoe_encap, + .name = "pppoe-encap", + .vector_size = sizeof (u32), + .format_trace = format_pppoe_encap_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(pppoe_encap_error_strings), + .error_strings = pppoe_encap_error_strings, + .n_next_nodes = PPPOE_ENCAP_N_NEXT, + .next_nodes = { +#define _(s,n) [PPPOE_ENCAP_NEXT_##s] = n, + foreach_pppoe_encap_next +#undef _ + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (pppoe_encap_node, pppoe_encap) + |