+++ /dev/null
-/*
- * Copyright (c) 2017 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 <nat/dslite.h>
-#include <nat/nat_inlines.h>
-#include <nat/nat_syslog.h>
-
-typedef enum
-{
- DSLITE_IN2OUT_NEXT_IP4_LOOKUP,
- DSLITE_IN2OUT_NEXT_IP6_ICMP,
- DSLITE_IN2OUT_NEXT_DROP,
- DSLITE_IN2OUT_NEXT_SLOWPATH,
- DSLITE_IN2OUT_N_NEXT,
-} dslite_in2out_next_t;
-
-static char *dslite_in2out_error_strings[] = {
-#define _(sym,string) string,
- foreach_dslite_error
-#undef _
-};
-
-static u32
-slow_path (dslite_main_t * dm, dslite_session_key_t * in2out_key,
- dslite_session_t ** sp, u32 next, u8 * error, u32 thread_index)
-{
- dslite_b4_t *b4;
- clib_bihash_kv_16_8_t b4_kv, b4_value;
- clib_bihash_kv_24_8_t in2out_kv;
- clib_bihash_kv_8_8_t out2in_kv;
- dlist_elt_t *head_elt, *oldest_elt, *elt;
- u32 oldest_index;
- dslite_session_t *s;
- snat_session_key_t out2in_key;
- u32 b4_index;
-
- out2in_key.protocol = in2out_key->proto;
- out2in_key.fib_index = 0;
-
- b4_kv.key[0] = in2out_key->softwire_id.as_u64[0];
- b4_kv.key[1] = in2out_key->softwire_id.as_u64[1];
-
- if (clib_bihash_search_16_8
- (&dm->per_thread_data[thread_index].b4_hash, &b4_kv, &b4_value))
- {
- pool_get (dm->per_thread_data[thread_index].b4s, b4);
- clib_memset (b4, 0, sizeof (*b4));
- b4->addr.as_u64[0] = in2out_key->softwire_id.as_u64[0];
- b4->addr.as_u64[1] = in2out_key->softwire_id.as_u64[1];
-
- pool_get (dm->per_thread_data[thread_index].list_pool, head_elt);
- b4->sessions_per_b4_list_head_index =
- head_elt - dm->per_thread_data[thread_index].list_pool;
- clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
- b4->sessions_per_b4_list_head_index);
-
- b4_index = b4_kv.value = b4 - dm->per_thread_data[thread_index].b4s;
- clib_bihash_add_del_16_8 (&dm->per_thread_data[thread_index].b4_hash,
- &b4_kv, 1);
-
- vlib_set_simple_counter (&dm->total_b4s, thread_index, 0,
- pool_elts (dm->
- per_thread_data[thread_index].b4s));
- }
- else
- {
- b4_index = b4_value.value;
- b4 =
- pool_elt_at_index (dm->per_thread_data[thread_index].b4s,
- b4_value.value);
- }
-
- //TODO configurable quota
- if (b4->nsessions >= 1000)
- {
- oldest_index =
- clib_dlist_remove_head (dm->per_thread_data[thread_index].list_pool,
- b4->sessions_per_b4_list_head_index);
- ASSERT (oldest_index != ~0);
- clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
- b4->sessions_per_b4_list_head_index, oldest_index);
- oldest_elt =
- pool_elt_at_index (dm->per_thread_data[thread_index].list_pool,
- oldest_index);
- s =
- pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
- oldest_elt->value);
-
- in2out_kv.key[0] = s->in2out.as_u64[0];
- in2out_kv.key[1] = s->in2out.as_u64[1];
- in2out_kv.key[2] = s->in2out.as_u64[2];
- clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
- &in2out_kv, 0);
- out2in_kv.key = s->out2in.as_u64;
- clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
- &out2in_kv, 0);
- snat_free_outside_address_and_port (dm->addr_pool, thread_index,
- &s->out2in);
-
- nat_syslog_dslite_apmdel (b4_index, &s->in2out.softwire_id,
- &s->in2out.addr, s->in2out.port,
- &s->out2in.addr, s->out2in.port,
- s->in2out.proto);
-
- if (snat_alloc_outside_address_and_port
- (dm->addr_pool, 0, thread_index, &out2in_key,
- dm->port_per_thread, thread_index))
- ASSERT (0);
- }
- else
- {
- if (snat_alloc_outside_address_and_port
- (dm->addr_pool, 0, thread_index, &out2in_key,
- dm->port_per_thread, thread_index))
- {
- *error = DSLITE_ERROR_OUT_OF_PORTS;
- return DSLITE_IN2OUT_NEXT_DROP;
- }
- pool_get (dm->per_thread_data[thread_index].sessions, s);
- clib_memset (s, 0, sizeof (*s));
- b4->nsessions++;
-
- pool_get (dm->per_thread_data[thread_index].list_pool, elt);
- clib_dlist_init (dm->per_thread_data[thread_index].list_pool,
- elt - dm->per_thread_data[thread_index].list_pool);
- elt->value = s - dm->per_thread_data[thread_index].sessions;
- s->per_b4_index = elt - dm->per_thread_data[thread_index].list_pool;
- s->per_b4_list_head_index = b4->sessions_per_b4_list_head_index;
- clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
- s->per_b4_list_head_index,
- elt - dm->per_thread_data[thread_index].list_pool);
-
- vlib_set_simple_counter (&dm->total_sessions, thread_index, 0,
- pool_elts (dm->per_thread_data
- [thread_index].sessions));
- }
-
- s->in2out = *in2out_key;
- s->out2in = out2in_key;
- *sp = s;
- in2out_kv.key[0] = s->in2out.as_u64[0];
- in2out_kv.key[1] = s->in2out.as_u64[1];
- in2out_kv.key[2] = s->in2out.as_u64[2];
- in2out_kv.value = s - dm->per_thread_data[thread_index].sessions;
- clib_bihash_add_del_24_8 (&dm->per_thread_data[thread_index].in2out,
- &in2out_kv, 1);
- out2in_kv.key = s->out2in.as_u64;
- out2in_kv.value = s - dm->per_thread_data[thread_index].sessions;
- clib_bihash_add_del_8_8 (&dm->per_thread_data[thread_index].out2in,
- &out2in_kv, 1);
-
- nat_syslog_dslite_apmadd (b4_index, &s->in2out.softwire_id, &s->in2out.addr,
- s->in2out.port, &s->out2in.addr, s->out2in.port,
- s->in2out.proto);
-
- return next;
-}
-
-static inline u32
-dslite_icmp_in2out (dslite_main_t * dm, ip6_header_t * ip6,
- ip4_header_t * ip4, dslite_session_t ** sp, u32 next,
- u8 * error, u32 thread_index)
-{
- dslite_session_t *s = 0;
- icmp46_header_t *icmp = ip4_next_header (ip4);
- clib_bihash_kv_24_8_t kv, value;
- dslite_session_key_t key;
- u32 n = next;
- icmp_echo_header_t *echo;
- u32 new_addr, old_addr;
- u16 old_id, new_id;
- ip_csum_t sum;
-
- if (icmp_type_is_error_message (icmp->type))
- {
- n = DSLITE_IN2OUT_NEXT_DROP;
- *error = DSLITE_ERROR_BAD_ICMP_TYPE;
- goto done;
- }
-
- echo = (icmp_echo_header_t *) (icmp + 1);
-
- key.addr = ip4->src_address;
- key.port = echo->identifier;
- key.proto = SNAT_PROTOCOL_ICMP;
- key.softwire_id.as_u64[0] = ip6->src_address.as_u64[0];
- key.softwire_id.as_u64[1] = ip6->src_address.as_u64[1];
- key.pad = 0;
- kv.key[0] = key.as_u64[0];
- kv.key[1] = key.as_u64[1];
- kv.key[2] = key.as_u64[2];
-
- if (clib_bihash_search_24_8
- (&dm->per_thread_data[thread_index].in2out, &kv, &value))
- {
- n = slow_path (dm, &key, &s, next, error, thread_index);
- if (PREDICT_FALSE (next == DSLITE_IN2OUT_NEXT_DROP))
- goto done;
- }
- else
- {
- s =
- pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
- value.value);
- }
-
- old_addr = ip4->src_address.as_u32;
- ip4->src_address = s->out2in.addr;
- new_addr = ip4->src_address.as_u32;
- sum = ip4->checksum;
- sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
- ip4->checksum = ip_csum_fold (sum);
-
- old_id = echo->identifier;
- echo->identifier = new_id = s->out2in.port;
- sum = icmp->checksum;
- sum = ip_csum_update (sum, old_id, new_id, icmp_echo_header_t, identifier);
- icmp->checksum = ip_csum_fold (sum);
-
-done:
- *sp = s;
- return n;
-}
-
-static inline uword
-dslite_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, u8 is_slow_path)
-{
- u32 n_left_from, *from, *to_next;
- dslite_in2out_next_t next_index;
- u32 node_index;
- vlib_node_runtime_t *error_node;
- u32 thread_index = vm->thread_index;
- f64 now = vlib_time_now (vm);
- dslite_main_t *dm = &dslite_main;
-
- node_index =
- is_slow_path ? dm->dslite_in2out_slowpath_node_index :
- dm->dslite_in2out_node_index;
-
- error_node = vlib_node_get_runtime (vm, node_index);
-
- from = vlib_frame_vector_args (frame);
- n_left_from = frame->n_vectors;
- 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 > 0 && n_left_to_next > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- u32 next0 = DSLITE_IN2OUT_NEXT_IP4_LOOKUP;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- u8 error0 = DSLITE_ERROR_IN2OUT;
- u32 proto0;
- dslite_session_t *s0 = 0;
- clib_bihash_kv_24_8_t kv0, value0;
- dslite_session_key_t key0;
- udp_header_t *udp0;
- tcp_header_t *tcp0;
- ip_csum_t sum0;
- u32 new_addr0, old_addr0;
- u16 old_port0, new_port0;
-
- /* 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);
- ip60 = vlib_buffer_get_current (b0);
-
- if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP))
- {
- if (ip60->protocol == IP_PROTOCOL_ICMP6)
- {
- next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP;
- goto trace0;
- }
- error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL;
- next0 = DSLITE_IN2OUT_NEXT_DROP;
- goto trace0;
- }
-
- ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t);
- proto0 = ip_proto_to_snat_proto (ip40->protocol);
-
- if (PREDICT_FALSE (proto0 == ~0))
- {
- error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
- next0 = DSLITE_IN2OUT_NEXT_DROP;
- goto trace0;
- }
-
- udp0 = ip4_next_header (ip40);
- tcp0 = (tcp_header_t *) udp0;
-
- if (is_slow_path)
- {
- if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
- {
- next0 =
- dslite_icmp_in2out (dm, ip60, ip40, &s0, next0, &error0,
- thread_index);
- if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
- goto trace0;
-
- goto accounting0;
- }
- }
- else
- {
- if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
- {
- next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
- goto trace0;
- }
- }
-
- key0.addr = ip40->src_address;
- key0.port = udp0->src_port;
- key0.proto = proto0;
- key0.softwire_id.as_u64[0] = ip60->src_address.as_u64[0];
- key0.softwire_id.as_u64[1] = ip60->src_address.as_u64[1];
- key0.pad = 0;
- kv0.key[0] = key0.as_u64[0];
- kv0.key[1] = key0.as_u64[1];
- kv0.key[2] = key0.as_u64[2];
-
- if (clib_bihash_search_24_8
- (&dm->per_thread_data[thread_index].in2out, &kv0, &value0))
- {
- if (is_slow_path)
- {
- next0 =
- slow_path (dm, &key0, &s0, next0, &error0, thread_index);
- if (PREDICT_FALSE (next0 == DSLITE_IN2OUT_NEXT_DROP))
- goto trace0;
- }
- else
- {
- next0 = DSLITE_IN2OUT_NEXT_SLOWPATH;
- goto trace0;
- }
- }
- else
- {
- s0 =
- pool_elt_at_index (dm->per_thread_data[thread_index].sessions,
- value0.value);
- }
-
- old_addr0 = ip40->src_address.as_u32;
- ip40->src_address = s0->out2in.addr;
- new_addr0 = ip40->src_address.as_u32;
- sum0 = ip40->checksum;
- sum0 =
- ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
- src_address);
- ip40->checksum = ip_csum_fold (sum0);
- if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
- {
- old_port0 = tcp0->src_port;
- tcp0->src_port = s0->out2in.port;
- new_port0 = tcp0->src_port;
-
- sum0 = tcp0->checksum;
- sum0 =
- ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
- dst_address);
- sum0 =
- ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
- length);
- mss_clamping (&snat_main, tcp0, &sum0);
- tcp0->checksum = ip_csum_fold (sum0);
- }
- else
- {
- old_port0 = udp0->src_port;
- udp0->src_port = s0->out2in.port;
- udp0->checksum = 0;
- }
-
- accounting0:
- /* Accounting */
- s0->last_heard = now;
- s0->total_pkts++;
- s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
- /* Per-B4 LRU list maintenance */
- clib_dlist_remove (dm->per_thread_data[thread_index].list_pool,
- s0->per_b4_index);
- clib_dlist_addtail (dm->per_thread_data[thread_index].list_pool,
- s0->per_b4_list_head_index, s0->per_b4_index);
-
- ip40->tos =
- (clib_net_to_host_u32
- (ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >>
- 20;
- vlib_buffer_advance (b0, sizeof (ip6_header_t));
-
- trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
- t->next_index = next0;
- t->session_index = ~0;
- if (s0)
- t->session_index =
- s0 - dm->per_thread_data[thread_index].sessions;
- }
-
- b0->error = error_node->errors[error0];
-
- /* 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;
-}
-
-VLIB_NODE_FN (dslite_in2out_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return dslite_in2out_node_fn_inline (vm, node, frame, 0);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dslite_in2out_node) = {
- .name = "dslite-in2out",
- .vector_size = sizeof (u32),
- .format_trace = format_dslite_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
- .error_strings = dslite_in2out_error_strings,
- .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
- /* edit / add dispositions here */
- .next_nodes = {
- [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
- [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
- [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input",
- [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (dslite_in2out_slowpath_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return dslite_in2out_node_fn_inline (vm, node, frame, 1);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dslite_in2out_slowpath_node) = {
- .name = "dslite-in2out-slowpath",
- .vector_size = sizeof (u32),
- .format_trace = format_dslite_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN (dslite_in2out_error_strings),
- .error_strings = dslite_in2out_error_strings,
- .n_next_nodes = DSLITE_IN2OUT_N_NEXT,
- /* edit / add dispositions here */
- .next_nodes = {
- [DSLITE_IN2OUT_NEXT_DROP] = "error-drop",
- [DSLITE_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
- [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-lookup",
- [DSLITE_IN2OUT_NEXT_SLOWPATH] = "dslite-in2out-slowpath",
- },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
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