diff options
Diffstat (limited to 'src/vnet/l2tp/decap.c')
| -rw-r--r-- | src/vnet/l2tp/decap.c | 301 |
1 files changed, 0 insertions, 301 deletions
diff --git a/src/vnet/l2tp/decap.c b/src/vnet/l2tp/decap.c deleted file mode 100644 index 787cc115a7e..00000000000 --- a/src/vnet/l2tp/decap.c +++ /dev/null @@ -1,301 +0,0 @@ -/* - * decap.c : L2TPv3 tunnel decapsulation - * - * 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 <vppinfra/error.h> -#include <vppinfra/hash.h> -#include <vnet/vnet.h> -#include <vnet/ip/ip.h> -#include <vnet/ethernet/ethernet.h> -#include <vnet/l2tp/l2tp.h> -#include <vnet/l2/l2_input.h> - -/* Statistics (not really errors) */ -#define foreach_l2t_decap_error \ -_(USER_TO_NETWORK, "L2TP user (ip6) to L2 network pkts") \ -_(SESSION_ID_MISMATCH, "l2tpv3 local session id mismatches") \ -_(COOKIE_MISMATCH, "l2tpv3 local cookie mismatches") \ -_(NO_SESSION, "l2tpv3 session not found") \ -_(ADMIN_DOWN, "l2tpv3 tunnel is down") - -static char *l2t_decap_error_strings[] = { -#define _(sym,string) string, - foreach_l2t_decap_error -#undef _ -}; - -typedef enum -{ -#define _(sym,str) L2T_DECAP_ERROR_##sym, - foreach_l2t_decap_error -#undef _ - L2T_DECAP_N_ERROR, -} l2t_DECAP_error_t; - -typedef enum -{ - L2T_DECAP_NEXT_DROP, - L2T_DECAP_NEXT_L2_INPUT, - L2T_DECAP_N_NEXT, - /* Pseudo next index */ - L2T_DECAP_NEXT_NO_INTERCEPT = L2T_DECAP_N_NEXT, -} l2t_decap_next_t; - -#define NSTAGES 3 - -static inline void -stage0 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b) -{ - vlib_prefetch_buffer_header (b, STORE); - /* l2tpv3 header is a long way away, need 2 cache lines */ - CLIB_PREFETCH (b->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); -} - -static inline void -stage1 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b) -{ - l2t_main_t *lm = &l2t_main; - ip6_header_t *ip6 = vlib_buffer_get_current (b); - u32 session_index; - uword *p = 0; - l2tpv3_header_t *l2t; - - /* Not L2tpv3 (0x73, 0t115)? Use the normal path. */ - if (PREDICT_FALSE (ip6->protocol != IP_PROTOCOL_L2TP)) - { - vnet_buffer (b)->l2t.next_index = L2T_DECAP_NEXT_NO_INTERCEPT; - return; - } - - /* Make up your minds, people... */ - switch (lm->lookup_type) - { - case L2T_LOOKUP_SRC_ADDRESS: - p = hash_get_mem (lm->session_by_src_address, &ip6->src_address); - break; - case L2T_LOOKUP_DST_ADDRESS: - p = hash_get_mem (lm->session_by_dst_address, &ip6->dst_address); - break; - case L2T_LOOKUP_SESSION_ID: - l2t = (l2tpv3_header_t *) (ip6 + 1); - p = hash_get (lm->session_by_session_id, l2t->session_id); - break; - default: - ASSERT (0); - } - - if (PREDICT_FALSE (p == 0)) - { - vnet_buffer (b)->l2t.next_index = L2T_DECAP_NEXT_NO_INTERCEPT; - return; - } - else - { - session_index = p[0]; - } - - /* Remember mapping index, prefetch the mini counter */ - vnet_buffer (b)->l2t.next_index = L2T_DECAP_NEXT_L2_INPUT; - vnet_buffer (b)->l2t.session_index = session_index; - - /* $$$$$ prefetch counter */ -} - -static inline u32 -last_stage (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b) -{ - l2t_main_t *lm = &l2t_main; - ip6_header_t *ip6 = vlib_buffer_get_current (b); - vlib_node_t *n = vlib_get_node (vm, node->node_index); - u32 node_counter_base_index = n->error_heap_index; - vlib_error_main_t *em = &vm->error_main; - l2tpv3_header_t *l2tp; - u32 counter_index; - l2t_session_t *session = 0; - u32 session_index; - u32 next_index; - u8 l2tp_decap_local = (l2t_decap_local_node.index == n->index); - - /* Other-than-output pkt? We're done... */ - if (vnet_buffer (b)->l2t.next_index != L2T_DECAP_NEXT_L2_INPUT) - { - next_index = vnet_buffer (b)->l2t.next_index; - goto done; - } - - em->counters[node_counter_base_index + L2T_DECAP_ERROR_USER_TO_NETWORK] += - 1; - - session_index = vnet_buffer (b)->l2t.session_index; - - counter_index = - session_index_to_counter_index (session_index, - SESSION_COUNTER_USER_TO_NETWORK); - - /* per-mapping byte stats include the ethernet header */ - vlib_increment_combined_counter (&lm->counter_main, - vlib_get_thread_index (), - counter_index, 1 /* packet_increment */ , - vlib_buffer_length_in_chain (vm, b) + - sizeof (ethernet_header_t)); - - session = pool_elt_at_index (lm->sessions, session_index); - - l2tp = vlib_buffer_get_current (b) + sizeof (*ip6); - - if (PREDICT_FALSE (l2tp->session_id != session->local_session_id)) - { - /* Key matched but session id does not. Assume packet is not for us. */ - em->counters[node_counter_base_index + - L2T_DECAP_ERROR_SESSION_ID_MISMATCH] += 1; - next_index = L2T_DECAP_NEXT_NO_INTERCEPT; - goto done; - } - - if (PREDICT_FALSE (l2tp->cookie != session->local_cookie[0])) - { - if (l2tp->cookie != session->local_cookie[1]) - { - /* Key and session ID matched, but cookie doesn't. Drop this packet. */ - b->error = node->errors[L2T_DECAP_ERROR_COOKIE_MISMATCH]; - next_index = L2T_DECAP_NEXT_DROP; - goto done; - } - } - - vnet_buffer (b)->sw_if_index[VLIB_RX] = session->sw_if_index; - - if (PREDICT_FALSE (!(session->admin_up))) - { - b->error = node->errors[L2T_DECAP_ERROR_ADMIN_DOWN]; - next_index = L2T_DECAP_NEXT_DROP; - goto done; - } - - /* strip the ip6 and L2TP header */ - vlib_buffer_advance (b, sizeof (*ip6) + session->l2tp_hdr_size); - - /* Required to make the l2 tag push / pop code work on l2 subifs */ - vnet_update_l2_len (b); - - if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) - { - l2t_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t)); - t->is_user_to_network = 1; - t->our_address.as_u64[0] = ip6->dst_address.as_u64[0]; - t->our_address.as_u64[1] = ip6->dst_address.as_u64[1]; - t->client_address.as_u64[0] = ip6->src_address.as_u64[0]; - t->client_address.as_u64[1] = ip6->src_address.as_u64[1]; - t->session_index = session_index; - } - - return L2T_DECAP_NEXT_L2_INPUT; - -done: - if (next_index == L2T_DECAP_NEXT_NO_INTERCEPT) - { - /* Small behavioral change between l2tp-decap and l2tp-decap-local */ - if (l2tp_decap_local) - { - b->error = node->errors[L2T_DECAP_ERROR_NO_SESSION]; - next_index = L2T_DECAP_NEXT_DROP; - } - else - { - /* Go to next node on the ip6 configuration chain */ - if (PREDICT_TRUE (session != 0)) - vnet_feature_next (&next_index, b); - } - } - - if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) - { - l2t_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t)); - t->is_user_to_network = 1; - t->our_address.as_u64[0] = ip6->dst_address.as_u64[0]; - t->our_address.as_u64[1] = ip6->dst_address.as_u64[1]; - t->client_address.as_u64[0] = ip6->src_address.as_u64[0]; - t->client_address.as_u64[1] = ip6->src_address.as_u64[1]; - t->session_index = ~0; - } - return next_index; -} - -#include <vnet/pipeline.h> - -VLIB_NODE_FN (l2t_decap_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return dispatch_pipeline (vm, node, frame); -} - -/* - * l2tp-decap and l2tp-decap-local have very slightly different behavior. - * When a packet has no associated session l2tp-decap let it go to ip6 forward, - * while l2tp-decap-local drops it. - */ - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (l2t_decap_node) = { - .name = "l2tp-decap", - .vector_size = sizeof (u32), - .format_trace = format_l2t_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(l2t_decap_error_strings), - .error_strings = l2t_decap_error_strings, - - .n_next_nodes = L2T_DECAP_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [L2T_DECAP_NEXT_L2_INPUT] = "l2-input", - [L2T_DECAP_NEXT_DROP] = "error-drop", - }, -}; -/* *INDENT-ON* */ - -extern vlib_node_function_t l2t_decap_node_fn; - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (l2t_decap_local_node) = { - .function = l2t_decap_node_fn, - .name = "l2tp-decap-local", - .vector_size = sizeof (u32), - .format_trace = format_l2t_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(l2t_decap_error_strings), - .error_strings = l2t_decap_error_strings, - - .n_next_nodes = L2T_DECAP_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [L2T_DECAP_NEXT_L2_INPUT] = "l2-input", - [L2T_DECAP_NEXT_DROP] = "error-drop", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |