/* * Copyright (c) 2015 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/lawful-intercept/lawful_intercept.h> #include <vppinfra/error.h> #include <vppinfra/elog.h> extern vlib_node_registration_t li_hit_node; typedef struct { u32 next_index; } li_hit_trace_t; /* packet trace format function */ static u8 * format_li_hit_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 *); li_hit_trace_t *t = va_arg (*args, li_hit_trace_t *); s = format (s, "LI_HIT: next index %d", t->next_index); return s; } #define foreach_li_hit_error \ _(HITS, "LI packets processed") \ _(NO_COLLECTOR, "No collector configured") \ _(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure") typedef enum { #define _(sym,str) LI_HIT_ERROR_##sym, foreach_li_hit_error #undef _ LI_HIT_N_ERROR, } li_hit_error_t; static char *li_hit_error_strings[] = { #define _(sym,string) string, foreach_li_hit_error #undef _ }; typedef enum { LI_HIT_NEXT_ETHERNET, LI_HIT_N_NEXT, } li_hit_next_t; VLIB_NODE_FN (li_hit_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; li_hit_next_t next_index; vlib_frame_t *int_frame = 0; u32 *to_int_next = 0; li_main_t *lm = &li_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; if (PREDICT_FALSE (vec_len (lm->collectors) == 0)) { vlib_node_increment_counter (vm, li_hit_node.index, LI_HIT_ERROR_NO_COLLECTOR, n_left_from); } else { /* The intercept frame... */ int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index); to_int_next = vlib_frame_vector_args (int_frame); } while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); #if 0 while (n_left_from >= 4 && n_left_to_next >= 2) { u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT; u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT; u32 sw_if_index0, sw_if_index1; u8 tmp0[6], tmp1[6]; ethernet_header_t *en0, *en1; u32 bi0, bi1; vlib_buffer_t *b0, *b1; /* 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_store (p2->data); clib_prefetch_store (p3->data); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); /* $$$$$ Dual loop: process 2 x packets here $$$$$ */ ASSERT (b0->current_data == 0); ASSERT (b1->current_data == 0); en0 = vlib_buffer_get_current (b0); en1 = vlib_buffer_get_current (b1); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; /* Send pkt back out the RX interface */ vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0; vnet_buffer (b1)->sw_if_index[VLIB_TX] = sw_if_index1; /* $$$$$ End of processing 2 x packets $$$$$ */ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { li_hit_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { li_hit_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->sw_if_index = sw_if_index1; t->next_index = next1; } } /* verify speculative enqueues, maybe switch current next frame */ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } #endif /* $$$ dual-loop off */ while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; vlib_buffer_t *c0; ip4_udp_header_t *iu0; ip4_header_t *ip0; udp_header_t *udp0; u32 next0 = LI_HIT_NEXT_ETHERNET; /* speculatively enqueue b0 to the current next frame */ 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); if (PREDICT_TRUE (to_int_next != 0)) { /* Make an intercept copy. This can fail. */ c0 = vlib_buffer_copy (vm, b0); if (PREDICT_FALSE (c0 == 0)) { vlib_node_increment_counter (vm, node->node_index, LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1); goto skip; } vlib_buffer_advance (c0, -sizeof (*iu0)); iu0 = vlib_buffer_get_current (c0); ip0 = &iu0->ip4; ip0->ip_version_and_header_length = 0x45; ip0->ttl = 254; ip0->protocol = IP_PROTOCOL_UDP; ip0->src_address.as_u32 = lm->src_addrs[0].as_u32; ip0->dst_address.as_u32 = lm->collectors[0].as_u32; ip0->length = vlib_buffer_length_in_chain (vm, c0); ip0->checksum = ip4_header_checksum (ip0); udp0 = &iu0->udp; udp0->src_port = udp0->dst_port = clib_host_to_net_u16 (lm->ports[0]); udp0->checksum = 0; udp0->length = clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, b0)); to_int_next[0] = vlib_get_buffer_index (vm, c0); to_int_next++; } skip: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { li_hit_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_index = next0; } /* 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); } if (int_frame) { int_frame->n_vectors = frame->n_vectors; vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame); } vlib_node_increment_counter (vm, li_hit_node.index, LI_HIT_ERROR_HITS, frame->n_vectors); return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (li_hit_node) = { .name = "li-hit", .vector_size = sizeof (u32), .format_trace = format_li_hit_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(li_hit_error_strings), .error_strings = li_hit_error_strings, .n_next_nodes = LI_HIT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */