diff options
author | 2019-12-19 11:55:54 +0100 | |
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committer | 2020-02-05 15:45:30 +0000 | |
commit | 2c6639c695aebf0cd5ac74ad31fd331547fa0126 (patch) | |
tree | dd962dda017462107eca0b838c159ea1e19f7b8a /src/plugins/nat/dslite_in2out.c | |
parent | 72e31bc2d9b910147c09e1c329713fccc873a018 (diff) |
nat: move dslite to separate sub-plugin
Type: refactor
Change-Id: If3d9f16f3a06c10b354f1eef674e8db5f3c44de7
Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/plugins/nat/dslite_in2out.c')
-rw-r--r-- | src/plugins/nat/dslite_in2out.c | 503 |
1 files changed, 0 insertions, 503 deletions
diff --git a/src/plugins/nat/dslite_in2out.c b/src/plugins/nat/dslite_in2out.c deleted file mode 100644 index 4494a77701e..00000000000 --- a/src/plugins/nat/dslite_in2out.c +++ /dev/null @@ -1,503 +0,0 @@ -/* - * 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: - */ |