diff options
Diffstat (limited to 'vnet/vnet/l2/l2_flood.c')
| -rw-r--r-- | vnet/vnet/l2/l2_flood.c | 568 |
1 files changed, 0 insertions, 568 deletions
diff --git a/vnet/vnet/l2/l2_flood.c b/vnet/vnet/l2/l2_flood.c deleted file mode 100644 index ed9e5ac2258..00000000000 --- a/vnet/vnet/l2/l2_flood.c +++ /dev/null @@ -1,568 +0,0 @@ -/* - * l2_flood.c : layer 2 flooding - * - * Copyright (c) 2013 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 <vnet/pg/pg.h> -#include <vnet/ethernet/ethernet.h> -#include <vlib/cli.h> -#include <vnet/l2/l2_input.h> -#include <vnet/l2/feat_bitmap.h> -#include <vnet/l2/l2_bvi.h> -#include <vnet/replication.h> -#include <vnet/l2/l2_fib.h> - -#include <vppinfra/error.h> -#include <vppinfra/hash.h> - - -/** - * @file - * @brief Ethernet Flooding. - * - * Flooding uses the packet replication infrastructure to send a copy of the - * packet to each member interface. Logically the replication infrastructure - * expects two graph nodes: a prep node that initiates replication and sends the - * packet to the first destination, and a recycle node that is passed the packet - * after it has been transmitted. - * - * To decrease the amount of code, l2 flooding implements both functions in - * the same graph node. This node can tell if is it being called as the "prep" - * or "recycle" using replication_is_recycled(). - */ - - -typedef struct -{ - - /* Next nodes for each feature */ - u32 feat_next_node_index[32]; - - /* next node index for the L3 input node of each ethertype */ - next_by_ethertype_t l3_next; - - /* convenience variables */ - vlib_main_t *vlib_main; - vnet_main_t *vnet_main; -} l2flood_main_t; - -typedef struct -{ - u8 src[6]; - u8 dst[6]; - u32 sw_if_index; - u16 bd_index; -} l2flood_trace_t; - - -/* packet trace format function */ -static u8 * -format_l2flood_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 *); - l2flood_trace_t *t = va_arg (*args, l2flood_trace_t *); - - s = format (s, "l2-flood: sw_if_index %d dst %U src %U bd_index %d", - t->sw_if_index, - format_ethernet_address, t->dst, - format_ethernet_address, t->src, t->bd_index); - return s; -} - -l2flood_main_t l2flood_main; - -static vlib_node_registration_t l2flood_node; - -#define foreach_l2flood_error \ -_(L2FLOOD, "L2 flood packets") \ -_(REPL_FAIL, "L2 replication failures") \ -_(NO_MEMBERS, "L2 replication complete") \ -_(BVI_BAD_MAC, "BVI L3 mac mismatch") \ -_(BVI_ETHERTYPE, "BVI packet with unhandled ethertype") - -typedef enum -{ -#define _(sym,str) L2FLOOD_ERROR_##sym, - foreach_l2flood_error -#undef _ - L2FLOOD_N_ERROR, -} l2flood_error_t; - -static char *l2flood_error_strings[] = { -#define _(sym,string) string, - foreach_l2flood_error -#undef _ -}; - -typedef enum -{ - L2FLOOD_NEXT_L2_OUTPUT, - L2FLOOD_NEXT_DROP, - L2FLOOD_N_NEXT, -} l2flood_next_t; - -/* - * Perform flooding on one packet - * - * Due to the way BVI processing can modify the packet, the BVI interface - * (if present) must be processed last in the replication. The member vector - * is arranged so that the BVI interface is always the first element. - * Flooding walks the vector in reverse. - * - * BVI processing causes the packet to go to L3 processing. This strips the - * L2 header, which is fine because the replication infrastructure restores - * it. However L3 processing can trigger larger changes to the packet. For - * example, an ARP request could be turned into an ARP reply, an ICMP request - * could be turned into an ICMP reply. If BVI processing is not performed - * last, the modified packet would be replicated to the remaining members. - */ - -static_always_inline void -l2flood_process (vlib_main_t * vm, - vlib_node_runtime_t * node, - l2flood_main_t * msm, - u64 * counter_base, - vlib_buffer_t * b0, - u32 * sw_if_index0, - l2fib_entry_key_t * key0, - u32 * bucket0, l2fib_entry_result_t * result0, u32 * next0) -{ - u16 bd_index0; - l2_bridge_domain_t *bd_config; - l2_flood_member_t *members; - i32 current_member; /* signed */ - replication_context_t *ctx; - u8 in_shg = vnet_buffer (b0)->l2.shg; - - if (!replication_is_recycled (b0)) - { - - /* Do flood "prep node" processing */ - - /* Get config for the bridge domain interface */ - bd_index0 = vnet_buffer (b0)->l2.bd_index; - bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index0); - members = bd_config->members; - - /* Find first member that passes the reflection and SHG checks */ - current_member = bd_config->flood_count - 1; - while ((current_member >= 0) && - ((members[current_member].sw_if_index == *sw_if_index0) || - (in_shg && members[current_member].shg == in_shg))) - { - current_member--; - } - - if (current_member < 0) - { - /* No members to flood to */ - *next0 = L2FLOOD_NEXT_DROP; - b0->error = node->errors[L2FLOOD_ERROR_NO_MEMBERS]; - return; - } - - if ((current_member > 0) && - ((current_member > 1) || - ((members[0].sw_if_index != *sw_if_index0) && - (!in_shg || members[0].shg != in_shg)))) - { - /* If more than one member then initiate replication */ - ctx = - replication_prep (vm, b0, l2flood_node.index, 1 /* l2_packet */ ); - ctx->feature_replicas = (uword) members; - ctx->feature_counter = current_member; - } - - } - else - { - vnet_buffer_opaque_t *vnet_buff_op; - - /* Do flood "recycle node" processing */ - - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_REPL_FAIL)) - { - (void) replication_recycle (vm, b0, 1 /* is_last */ ); - *next0 = L2FLOOD_NEXT_DROP; - b0->error = node->errors[L2FLOOD_ERROR_REPL_FAIL]; - return; - } - - ctx = replication_get_ctx (b0); - replication_clear_recycled (b0); - - members = (l2_flood_member_t *) (intptr_t) ctx->feature_replicas; - current_member = (i32) ctx->feature_counter - 1; - - /* Need to update input index from saved packet context */ - vnet_buff_op = (vnet_buffer_opaque_t *) ctx->vnet_buffer; - *sw_if_index0 = vnet_buff_op->sw_if_index[VLIB_RX]; - - /* Find next member that passes the reflection and SHG check */ - while ((current_member >= 0) && - ((members[current_member].sw_if_index == *sw_if_index0) || - (in_shg && members[current_member].shg == in_shg))) - { - current_member--; - } - - if (current_member < 0) - { - /* - * No more members to flood to. - * Terminate replication and drop packet. - */ - - replication_recycle (vm, b0, 1 /* is_last */ ); - - *next0 = L2FLOOD_NEXT_DROP; - /* Ideally we woudn't bump a counter here, just silently complete */ - b0->error = node->errors[L2FLOOD_ERROR_NO_MEMBERS]; - return; - } - - /* Restore packet and context and continue replication */ - ctx->feature_counter = current_member; - replication_recycle (vm, b0, ((current_member == 0) || /*is_last */ - ((current_member == 1) && - ((members[0].sw_if_index == - *sw_if_index0) || (in_shg - && members[0].shg == - in_shg))))); - } - - /* Forward packet to the current member */ - if (PREDICT_FALSE (members[current_member].flags & L2_FLOOD_MEMBER_BVI)) - { - /* Do BVI processing */ - u32 rc; - rc = l2_to_bvi (vm, - msm->vnet_main, - b0, - members[current_member].sw_if_index, - &msm->l3_next, next0); - - if (PREDICT_FALSE (rc)) - { - if (rc == TO_BVI_ERR_BAD_MAC) - { - b0->error = node->errors[L2FLOOD_ERROR_BVI_BAD_MAC]; - *next0 = L2FLOOD_NEXT_DROP; - } - else if (rc == TO_BVI_ERR_ETHERTYPE) - { - b0->error = node->errors[L2FLOOD_ERROR_BVI_ETHERTYPE]; - *next0 = L2FLOOD_NEXT_DROP; - } - } - } - else - { - /* Do normal L2 forwarding */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = - members[current_member].sw_if_index; - *next0 = L2FLOOD_NEXT_L2_OUTPUT; - - } - -} - - -static uword -l2flood_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - u32 n_left_from, *from, *to_next; - l2flood_next_t next_index; - l2flood_main_t *msm = &l2flood_main; - vlib_node_t *n = vlib_get_node (vm, l2flood_node.index); - u32 node_counter_base_index = n->error_heap_index; - vlib_error_main_t *em = &vm->error_main; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; /* number of packets to process */ - next_index = node->cached_next_index; - - while (n_left_from > 0) - { - u32 n_left_to_next; - - /* get space to enqueue frame to graph node "next_index" */ - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left_from >= 6 && n_left_to_next >= 2) - { - u32 bi0, bi1; - vlib_buffer_t *b0, *b1; - u32 next0, next1; - u32 sw_if_index0, sw_if_index1; - l2fib_entry_key_t key0, key1; - l2fib_entry_result_t result0, result1; - u32 bucket0, bucket1; - - /* Prefetch next iteration. */ - { - vlib_buffer_t *p2, *p3, *p4, *p5; - - p2 = vlib_get_buffer (vm, from[2]); - p3 = vlib_get_buffer (vm, from[3]); - p4 = vlib_get_buffer (vm, from[4]); - p5 = vlib_get_buffer (vm, from[5]); - - /* Prefetch the buffer header for the N+2 loop iteration */ - vlib_prefetch_buffer_header (p4, LOAD); - vlib_prefetch_buffer_header (p5, LOAD); - - /* Prefetch the replication context for the N+1 loop iteration */ - /* This depends on the buffer header above */ - replication_prefetch_ctx (p2); - replication_prefetch_ctx (p3); - - /* Prefetch the packet for the N+1 loop iteration */ - 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 */ - /* bi is "buffer index", b is pointer to the buffer */ - 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); - - /* RX interface handles */ - sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; - - /* process 2 pkts */ - em->counters[node_counter_base_index + L2FLOOD_ERROR_L2FLOOD] += 2; - - l2flood_process (vm, node, msm, - &em->counters[node_counter_base_index], b0, - &sw_if_index0, &key0, &bucket0, &result0, &next0); - - l2flood_process (vm, node, msm, - &em->counters[node_counter_base_index], b1, - &sw_if_index1, &key1, &bucket1, &result1, &next1); - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) - { - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - l2flood_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - ethernet_header_t *h0 = vlib_buffer_get_current (b0); - t->sw_if_index = sw_if_index0; - t->bd_index = vnet_buffer (b0)->l2.bd_index; - clib_memcpy (t->src, h0->src_address, 6); - clib_memcpy (t->dst, h0->dst_address, 6); - } - if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED)) - { - l2flood_trace_t *t = - vlib_add_trace (vm, node, b1, sizeof (*t)); - ethernet_header_t *h1 = vlib_buffer_get_current (b1); - t->sw_if_index = sw_if_index1; - t->bd_index = vnet_buffer (b1)->l2.bd_index; - clib_memcpy (t->src, h1->src_address, 6); - clib_memcpy (t->dst, h1->dst_address, 6); - } - } - - /* verify speculative enqueues, maybe switch current next frame */ - /* if next0==next1==next_index then nothing special needs to be done */ - 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 next0; - u32 sw_if_index0; - l2fib_entry_key_t key0; - l2fib_entry_result_t result0; - u32 bucket0; - - /* 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); - - sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - - /* process 1 pkt */ - em->counters[node_counter_base_index + L2FLOOD_ERROR_L2FLOOD] += 1; - - l2flood_process (vm, node, msm, - &em->counters[node_counter_base_index], b0, - &sw_if_index0, &key0, &bucket0, &result0, &next0); - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && - (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - l2flood_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); - ethernet_header_t *h0 = vlib_buffer_get_current (b0); - t->sw_if_index = sw_if_index0; - t->bd_index = vnet_buffer (b0)->l2.bd_index; - clib_memcpy (t->src, h0->src_address, 6); - clib_memcpy (t->dst, h0->dst_address, 6); - } - - /* 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); - } - - return frame->n_vectors; -} - - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (l2flood_node,static) = { - .function = l2flood_node_fn, - .name = "l2-flood", - .vector_size = sizeof (u32), - .format_trace = format_l2flood_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(l2flood_error_strings), - .error_strings = l2flood_error_strings, - - .n_next_nodes = L2FLOOD_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [L2FLOOD_NEXT_L2_OUTPUT] = "l2-output", - [L2FLOOD_NEXT_DROP] = "error-drop", - }, -}; -/* *INDENT-ON* */ - -VLIB_NODE_FUNCTION_MULTIARCH (l2flood_node, l2flood_node_fn) - clib_error_t *l2flood_init (vlib_main_t * vm) -{ - l2flood_main_t *mp = &l2flood_main; - - mp->vlib_main = vm; - mp->vnet_main = vnet_get_main (); - - /* Initialize the feature next-node indexes */ - feat_bitmap_init_next_nodes (vm, - l2flood_node.index, - L2INPUT_N_FEAT, - l2input_get_feat_names (), - mp->feat_next_node_index); - - return 0; -} - -VLIB_INIT_FUNCTION (l2flood_init); - - - -/** Add the L3 input node for this ethertype to the next nodes structure. */ -void -l2flood_register_input_type (vlib_main_t * vm, - ethernet_type_t type, u32 node_index) -{ - l2flood_main_t *mp = &l2flood_main; - u32 next_index; - - next_index = vlib_node_add_next (vm, l2flood_node.index, node_index); - - next_by_ethertype_register (&mp->l3_next, type, next_index); -} - - -/** - * Set subinterface flood enable/disable. - * The CLI format is: - * set interface l2 flood <interface> [disable] - */ -static clib_error_t * -int_flood (vlib_main_t * vm, - unformat_input_t * input, vlib_cli_command_t * cmd) -{ - vnet_main_t *vnm = vnet_get_main (); - clib_error_t *error = 0; - u32 sw_if_index; - u32 enable; - - if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index)) - { - error = clib_error_return (0, "unknown interface `%U'", - format_unformat_error, input); - goto done; - } - - enable = 1; - if (unformat (input, "disable")) - { - enable = 0; - } - - /* set the interface flag */ - l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_FLOOD, enable); - -done: - return error; -} - -/*? - * Layer 2 flooding can be enabled and disabled on each - * interface and on each bridge-domain. Use this command to - * manage interfaces. It is enabled by default. - * - * @cliexpar - * Example of how to enable flooding: - * @cliexcmd{set interface l2 flood GigabitEthernet0/8/0} - * Example of how to disable flooding: - * @cliexcmd{set interface l2 flood GigabitEthernet0/8/0 disable} -?*/ -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (int_flood_cli, static) = { - .path = "set interface l2 flood", - .short_help = "set interface l2 flood <interface> [disable]", - .function = int_flood, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |