diff options
Diffstat (limited to 'src/vnet/lawful-intercept/node.c')
| -rw-r--r-- | src/vnet/lawful-intercept/node.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/vnet/lawful-intercept/node.c b/src/vnet/lawful-intercept/node.c new file mode 100644 index 00000000000..ea0cd8efcdd --- /dev/null +++ b/src/vnet/lawful-intercept/node.c @@ -0,0 +1,275 @@ +/* + * 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> + +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; +} + +vlib_node_registration_t li_hit_node; + +#define foreach_li_hit_error \ +_(HITS, "LI packets processed") \ +_(NO_COLLECTOR, "No collector configured") + +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; + +static uword +li_hit_node_fn (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 (p2->data, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); + } + + /* 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 */ + c0 = vlib_buffer_copy (vm, b0); + + 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++; + } + + 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; +} + +VLIB_REGISTER_NODE (li_hit_node) = { + .function = li_hit_node_fn, + .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", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (li_hit_node, li_hit_node_fn) + |