/* * Copyright (c) 2016 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. */ #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vppinfra/error.h> #include <vnet/span/span.h> #include <vppinfra/error.h> #include <vppinfra/elog.h> vlib_node_registration_t span_node; /* packet trace format function */ u8 * format_span_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 *); span_trace_t *t = va_arg (*args, span_trace_t *); vnet_main_t *vnm = &vnet_main; s = format (s, "SPAN: mirrored %U -> %U", format_vnet_sw_if_index_name, vnm, t->src_sw_if_index, format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index); return s; } #define foreach_span_error \ _(HITS, "SPAN incomming packets processed") typedef enum { #define _(sym,str) SPAN_ERROR_##sym, foreach_span_error #undef _ SPAN_N_ERROR, } span_error_t; static char *span_error_strings[] = { #define _(sym,string) string, foreach_span_error #undef _ }; static_always_inline void span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0, vlib_buffer_t * b0, vlib_frame_t ** mirror_frames, int is_rx) { vlib_buffer_t *c0; span_main_t *sm = &span_main; vnet_main_t *vnm = &vnet_main; span_interface_t *si0 = 0; u32 *to_mirror_next = 0; u32 i; si0 = vec_elt_at_index (sm->interfaces, sw_if_index0); if (is_rx != 0 && si0->num_rx_mirror_ports == 0) return; if (is_rx == 0 && si0->num_tx_mirror_ports == 0) return; /* Don't do it again */ if (PREDICT_FALSE (b0->flags & VNET_BUFFER_SPAN_CLONE)) return; /* *INDENT-OFF* */ clib_bitmap_foreach (i, is_rx ? si0->rx_mirror_ports : si0->tx_mirror_ports, ( { if (mirror_frames[i] == 0) mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i); to_mirror_next = vlib_frame_vector_args (mirror_frames[i]); to_mirror_next += mirror_frames[i]->n_vectors; /* This can fail */ c0 = vlib_buffer_copy (vm, b0); if (PREDICT_TRUE(c0 != 0)) { vnet_buffer (c0)->sw_if_index[VLIB_TX] = i; c0->flags |= VNET_BUFFER_SPAN_CLONE; to_mirror_next[0] = vlib_get_buffer_index (vm, c0); mirror_frames[i]->n_vectors++; if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->src_sw_if_index = sw_if_index0; t->mirror_sw_if_index = i; } } })); /* *INDENT-ON* */ } static_always_inline uword span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_rx) { span_main_t *sm = &span_main; vnet_main_t *vnm = &vnet_main; u32 n_left_from, *from, *to_next; u32 n_span_packets = 0; u32 next_index; u32 sw_if_index; static __thread vlib_frame_t **mirror_frames = 0; vlib_rx_or_tx_t rxtx = is_rx ? VLIB_RX : VLIB_TX; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; vec_validate_aligned (mirror_frames, sm->max_sw_if_index, CLIB_CACHE_LINE_BYTES); 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; u32 bi1; vlib_buffer_t *b0; vlib_buffer_t *b1; u32 sw_if_index0; u32 next0 = 0; u32 sw_if_index1; u32 next1 = 0; /* speculatively enqueue b0, b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; to_next += 2; n_left_to_next -= 2; from += 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx]; span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx); span_mirror (vm, node, sw_if_index1, b1, mirror_frames, is_rx); vnet_feature_next (sw_if_index0, &next0, b0); vnet_feature_next (sw_if_index1, &next1, b1); /* verify speculative enqueue, maybe switch current next frame */ 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 sw_if_index0; u32 next0 = 0; /* speculatively enqueue b0 to the current next frame */ to_next[0] = bi0 = from[0]; to_next += 1; n_left_to_next -= 1; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx]; span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx); vnet_feature_next (sw_if_index0, &next0, b0); /* verify speculative enqueue, maybe switch current next frame */ 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); } for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++) { if (mirror_frames[sw_if_index] == 0) continue; vnet_put_frame_to_sw_interface (vnm, sw_if_index, mirror_frames[sw_if_index]); mirror_frames[sw_if_index] = 0; } vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS, n_span_packets); return frame->n_vectors; } static uword span_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return span_node_inline_fn (vm, node, frame, 1); } static uword span_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return span_node_inline_fn (vm, node, frame, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (span_input_node) = { .function = span_input_node_fn, .name = "span-input", .vector_size = sizeof (u32), .format_trace = format_span_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(span_error_strings), .error_strings = span_error_strings, .n_next_nodes = 0, /* edit / add dispositions here */ .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_input_node_fn) VLIB_REGISTER_NODE (span_output_node) = { .function = span_output_node_fn, .name = "span-output", .vector_size = sizeof (u32), .format_trace = format_span_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(span_error_strings), .error_strings = span_error_strings, .n_next_nodes = 0, /* edit / add dispositions here */ .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_output_node_fn) /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */