diff options
Diffstat (limited to 'src/vnet/snap/node.c')
| -rw-r--r-- | src/vnet/snap/node.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/src/vnet/snap/node.c b/src/vnet/snap/node.c new file mode 100644 index 00000000000..884ff32444b --- /dev/null +++ b/src/vnet/snap/node.c @@ -0,0 +1,353 @@ +/* + * 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. + */ +/* + * snap_node.c: snap packet processing + * + * Copyright (c) 2010 Eliot Dresselhaus + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/llc/llc.h> +#include <vnet/snap/snap.h> + +typedef enum +{ + SNAP_INPUT_NEXT_DROP, + SNAP_INPUT_NEXT_PUNT, + SNAP_INPUT_NEXT_ETHERNET_TYPE, + SNAP_INPUT_N_NEXT, +} snap_input_next_t; + +typedef struct +{ + u8 packet_data[32]; +} snap_input_trace_t; + +static u8 * +format_snap_input_trace (u8 * s, va_list * va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + snap_input_trace_t *t = va_arg (*va, snap_input_trace_t *); + + s = format (s, "%U", format_snap_header, t->packet_data); + + return s; +} + +static uword +snap_input (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + snap_main_t *sm = &snap_main; + u32 n_left_from, next_index, *from, *to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + if (node->flags & VLIB_NODE_FLAG_TRACE) + vlib_trace_frame_buffers_only (vm, node, + from, + n_left_from, + sizeof (from[0]), + sizeof (snap_input_trace_t)); + + next_index = node->cached_next_index; + + 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; + snap_header_t *h0, *h1; + snap_protocol_info_t *pi0, *pi1; + u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1, + enqueue_code; + u32 oui0, oui1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *b2, *b3; + + b2 = vlib_get_buffer (vm, from[2]); + b3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (b2, LOAD); + vlib_prefetch_buffer_header (b3, LOAD); + + CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD); + CLIB_PREFETCH (b3->data, sizeof (h1[0]), 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); + + h0 = (void *) (b0->data + b0->current_data); + h1 = (void *) (b1->data + b1->current_data); + + oui0 = snap_header_get_oui (h0); + oui1 = snap_header_get_oui (h1); + + is_ethernet0 = oui0 == IEEE_OUI_ethernet; + is_ethernet1 = oui1 == IEEE_OUI_ethernet; + + len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0); + len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0); + + b0->current_data += len0; + b1->current_data += len1; + + b0->current_length -= len0; + b1->current_length -= len1; + + pi0 = snap_get_protocol_info (sm, h0); + pi1 = snap_get_protocol_info (sm, h1); + + next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP; + next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP; + + next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0; + next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1; + + /* In case of error. */ + b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + + enqueue_code = (next0 != next_index) + 2 * (next1 != next_index); + + if (PREDICT_FALSE (enqueue_code != 0)) + { + switch (enqueue_code) + { + case 1: + /* A B A */ + to_next[-2] = bi1; + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, next0, bi0); + break; + + case 2: + /* A A B */ + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, next1, bi1); + break; + + case 3: + /* A B B or A B C */ + to_next -= 2; + n_left_to_next += 2; + vlib_set_next_frame_buffer (vm, node, next0, bi0); + vlib_set_next_frame_buffer (vm, node, next1, bi1); + if (next0 == next1) + { + vlib_put_next_frame (vm, node, next_index, + n_left_to_next); + next_index = next1; + 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; + snap_header_t *h0; + snap_protocol_info_t *pi0; + u8 next0, is_ethernet0, len0; + u32 oui0; + + 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); + + h0 = (void *) (b0->data + b0->current_data); + + oui0 = snap_header_get_oui (h0); + + is_ethernet0 = oui0 == IEEE_OUI_ethernet; + + len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0); + + b0->current_data += len0; + + b0->current_length -= len0; + + pi0 = snap_get_protocol_info (sm, h0); + + next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP; + + next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0; + + /* In case of error. */ + b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + + /* Sent packet to wrong next? */ + if (PREDICT_FALSE (next0 != next_index)) + { + /* Return old frame; remove incorrectly enqueued packet. */ + vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1); + + /* Send to correct next. */ + next_index = next0; + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + } + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return from_frame->n_vectors; +} + +static char *snap_error_strings[] = { +#define _(f,s) s, + foreach_snap_error +#undef _ +}; + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (snap_input_node) = { + .function = snap_input, + .name = "snap-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = SNAP_N_ERROR, + .error_strings = snap_error_strings, + + .n_next_nodes = SNAP_INPUT_N_NEXT, + .next_nodes = { + [SNAP_INPUT_NEXT_DROP] = "error-drop", + [SNAP_INPUT_NEXT_PUNT] = "error-punt", + [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type", + }, + + .format_buffer = format_snap_header_with_length, + .format_trace = format_snap_input_trace, + .unformat_buffer = unformat_snap_header, +}; +/* *INDENT-ON* */ + +static clib_error_t * +snap_input_init (vlib_main_t * vm) +{ + { + clib_error_t *error = vlib_call_init_function (vm, snap_init); + if (error) + clib_error_report (error); + } + + snap_setup_node (vm, snap_input_node.index); + + llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index); + + return 0; +} + +VLIB_INIT_FUNCTION (snap_input_init); + +void +snap_register_input_protocol (vlib_main_t * vm, + char *name, + u32 ieee_oui, u16 protocol, u32 node_index) +{ + snap_main_t *sm = &snap_main; + snap_protocol_info_t *pi; + snap_header_t h; + snap_oui_and_protocol_t key; + + { + clib_error_t *error = vlib_call_init_function (vm, snap_input_init); + if (error) + clib_error_report (error); + } + + h.protocol = clib_host_to_net_u16 (protocol); + h.oui[0] = (ieee_oui >> 16) & 0xff; + h.oui[1] = (ieee_oui >> 8) & 0xff; + h.oui[2] = (ieee_oui >> 0) & 0xff; + pi = snap_get_protocol_info (sm, &h); + if (pi) + return; + + vec_add2 (sm->protocols, pi, 1); + + pi->name = format (0, "%s", name); + pi->node_index = node_index; + pi->next_index = vlib_node_add_next (vm, snap_input_node.index, node_index); + + key.oui = ieee_oui; + key.protocol = clib_host_to_net_u16 (protocol); + + mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0); + hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols); +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |