+++ /dev/null
-/*
- * encap.c : L2TPv3 tunnel encapsulation
- *
- * 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>
-
-/* Statistics (not really errors) */
-#define foreach_l2t_encap_error \
-_(NETWORK_TO_USER, "L2TP L2 network to user (ip6) pkts") \
-_(LOOKUP_FAIL_TO_L3, "L2TP L2 session lookup failed pkts") \
-_(ADMIN_DOWN, "L2TP tunnel is down")
-
-static char *l2t_encap_error_strings[] = {
-#define _(sym,string) string,
- foreach_l2t_encap_error
-#undef _
-};
-
-typedef enum
-{
-#define _(sym,str) L2T_ENCAP_ERROR_##sym,
- foreach_l2t_encap_error
-#undef _
- L2T_ENCAP_N_ERROR,
-} l2t_encap_error_t;
-
-
-typedef enum
-{
- L2T_ENCAP_NEXT_DROP,
- L2T_ENCAP_NEXT_IP6_LOOKUP,
- L2T_ENCAP_N_NEXT,
-} l2t_encap_next_t;
-
-typedef struct
-{
- u32 cached_session_index;
- u32 cached_sw_if_index;
- vnet_main_t *vnet_main;
-} l2tp_encap_runtime_t;
-
-vlib_node_registration_t l2t_encap_node;
-
-#define NSTAGES 3
-
-static inline void
-stage0 (vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
-{
- vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
- vlib_prefetch_buffer_header (b, STORE);
- CLIB_PREFETCH (b->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
-}
-
-static inline void
-stage1 (vlib_main_t * vm, vlib_node_runtime_t * node, u32 bi)
-{
- l2tp_encap_runtime_t *rt = (void *) node->runtime_data;
- vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- vnet_hw_interface_t *hi;
-
- u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
- u32 session_index = rt->cached_session_index;
-
- if (PREDICT_FALSE (rt->cached_sw_if_index != sw_if_index))
- {
- hi = vnet_get_sup_hw_interface (rt->vnet_main, sw_if_index);
- session_index = rt->cached_session_index = hi->dev_instance;
- rt->cached_sw_if_index = sw_if_index;
- }
-
- /* Remember mapping index, prefetch the mini counter */
- vnet_buffer (b)->l2t.next_index = L2T_ENCAP_NEXT_IP6_LOOKUP;
- vnet_buffer (b)->l2t.session_index = session_index;
-
- /* $$$$ prefetch counter... */
-}
-
-static inline u32
-last_stage (vlib_main_t * vm, vlib_node_runtime_t * node, u32 bi)
-{
- vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- l2t_main_t *lm = &l2t_main;
- vlib_node_t *n = vlib_get_node (vm, l2t_encap_node.index);
- u32 node_counter_base_index = n->error_heap_index;
- vlib_error_main_t *em = &vm->error_main;
- l2tpv3_header_t *l2tp;
- u32 session_index;
- u32 counter_index;
- l2t_session_t *s;
- ip6_header_t *ip6;
- u16 payload_length;
- u32 next_index = L2T_ENCAP_NEXT_IP6_LOOKUP;
-
- /* Other-than-output pkt? We're done... */
- if (vnet_buffer (b)->l2t.next_index != L2T_ENCAP_NEXT_IP6_LOOKUP)
- return vnet_buffer (b)->l2t.next_index;
-
- em->counters[node_counter_base_index + L2T_ENCAP_ERROR_NETWORK_TO_USER] +=
- 1;
-
- session_index = vnet_buffer (b)->l2t.session_index;
-
- counter_index =
- session_index_to_counter_index (session_index,
- SESSION_COUNTER_NETWORK_TO_USER);
-
- /* per-mapping byte stats include the ethernet header */
- vlib_increment_combined_counter (&lm->counter_main,
- os_get_cpu_number (),
- counter_index, 1 /* packet_increment */ ,
- vlib_buffer_length_in_chain (vm, b));
-
- s = pool_elt_at_index (lm->sessions, session_index);
-
- vnet_buffer (b)->sw_if_index[VLIB_TX] = s->encap_fib_index;
-
- /* Paint on an l2tpv3 hdr */
- vlib_buffer_advance (b, -(s->l2tp_hdr_size));
- l2tp = vlib_buffer_get_current (b);
-
- l2tp->session_id = s->remote_session_id;
- l2tp->cookie = s->remote_cookie;
- if (PREDICT_FALSE (s->l2_sublayer_present))
- {
- l2tp->l2_specific_sublayer = 0;
- }
-
- /* Paint on an ip6 header */
- vlib_buffer_advance (b, -(sizeof (*ip6)));
- ip6 = vlib_buffer_get_current (b);
-
- if (PREDICT_FALSE (!(s->admin_up)))
- {
- b->error = node->errors[L2T_ENCAP_ERROR_ADMIN_DOWN];
- next_index = L2T_ENCAP_NEXT_DROP;
- goto done;
- }
-
- ip6->ip_version_traffic_class_and_flow_label =
- clib_host_to_net_u32 (0x6 << 28);
-
- /* calculate ip6 payload length */
- payload_length = vlib_buffer_length_in_chain (vm, b);
- payload_length -= sizeof (*ip6);
-
- ip6->payload_length = clib_host_to_net_u16 (payload_length);
- ip6->protocol = IP_PROTOCOL_L2TP;
- ip6->hop_limit = 0xff;
- ip6->src_address.as_u64[0] = s->our_address.as_u64[0];
- ip6->src_address.as_u64[1] = s->our_address.as_u64[1];
- ip6->dst_address.as_u64[0] = s->client_address.as_u64[0];
- ip6->dst_address.as_u64[1] = s->client_address.as_u64[1];
-
-
-done:
- 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 = 0;
- t->our_address.as_u64[0] = ip6->src_address.as_u64[0];
- t->our_address.as_u64[1] = ip6->src_address.as_u64[1];
- t->client_address.as_u64[0] = ip6->dst_address.as_u64[0];
- t->client_address.as_u64[1] = ip6->dst_address.as_u64[1];
- t->session_index = session_index;
- }
-
- return next_index;
-}
-
-#include <vnet/pipeline.h>
-
-uword
-l2t_encap_node_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
- return dispatch_pipeline (vm, node, frame);
-}
-
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (l2t_encap_node) = {
- .function = l2t_encap_node_fn,
- .name = "l2tp-encap",
- .vector_size = sizeof (u32),
- .format_trace = format_l2t_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .runtime_data_bytes = sizeof (l2tp_encap_runtime_t),
-
- .n_errors = ARRAY_LEN(l2t_encap_error_strings),
- .error_strings = l2t_encap_error_strings,
-
- .n_next_nodes = L2T_ENCAP_N_NEXT,
-
- /* add dispositions here */
- .next_nodes = {
- [L2T_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
- [L2T_ENCAP_NEXT_DROP] = "error-drop",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FUNCTION_MULTIARCH (l2t_encap_node, l2t_encap_node_fn);
-void
-l2tp_encap_init (vlib_main_t * vm)
-{
- l2tp_encap_runtime_t *rt;
-
- rt = vlib_node_get_runtime_data (vm, l2t_encap_node.index);
- rt->vnet_main = vnet_get_main ();
- rt->cached_sw_if_index = (u32) ~ 0;
- rt->cached_session_index = (u32) ~ 0;
-}
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
Code Review / vpp.git / blobdiff