diff options
Diffstat (limited to 'plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c')
| -rw-r--r-- | plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c | 424 |
1 files changed, 0 insertions, 424 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c b/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c deleted file mode 100644 index 5bea7073..00000000 --- a/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c +++ /dev/null @@ -1,424 +0,0 @@ -/* - *--------------------------------------------------------------------------- - * cnat_ipv4_tcp_inside_input.c - cnat_ipv4_tcp_inside_input node pipeline - * stage functions - * - * - * Copyright (c) 2008-2014 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 <vppinfra/error.h> -#include <vnet/buffer.h> - -#include "cnat_db.h" -#include "tcp_header_definitions.h" -#include "cnat_config.h" -#include "cnat_global.h" -#include "cnat_v4_functions.h" - -#define foreach_cnat_ipv4_tcp_inside_input_error \ -_(CNAT_V4_TCP_I2O_PKT_IN, "tcp i2o packets received") \ -_(CNAT_V4_TCP_I2O_PKT_T, "tcp i2o packets natted") \ -_(CNAT_V4_TCP_I2O_EXCEPTION, "packets to tcp i2o exception") \ -_(CNAT_V4_TCP_I2O_TTL_GEN, "generated TTL expiry ICMP packets") \ -_(CNAT_V4_TCP_I2O_TTL_GEN_DROP, "could not generate TTL expiry ICMP packets") \ -_(CNAT_V4_TCP_I2O_SESSION_DROP, "could not generate session") \ -_(CNAT_V4_UDP_I2O_FRAG_DROP, "non-first fragment drop") - -typedef enum { -#define _(sym,str) sym, - foreach_cnat_ipv4_tcp_inside_input_error -#undef _ - CNAT_IPV4_TCP_INSIDE_INPUT_N_ERROR, -} cnat_ipv4_tcp_inside_input_t; - -static char * cnat_ipv4_tcp_inside_input_error_strings[] = { -#define _(sym,string) string, - foreach_cnat_ipv4_tcp_inside_input_error -#undef _ -}; - -typedef struct { - u32 cached_next_index; - /* $$$$ add data here */ - - /* convenience variables */ - vlib_main_t * vlib_main; - vnet_main_t * vnet_main; -} cnat_ipv4_tcp_inside_input_main_t; - -typedef enum { - CNAT_V4_TCP_I2O_E, - CNAT_V4_TCP_I2O_T, - CNAT_V4_TCP_I2O_D, - CNAT_V4_TCP_I2O_NEXT, -} cnat_ipv4_tcp_inside_input_next_t; - -#define CNAT_REWRITE_OUTPUT CNAT_V4_TCP_I2O_T -#define CNAT_V4_ICMP_GEN CNAT_V4_TCP_I2O_D - -//#define CNAT_V4_TCP_I2O_E CNAT_V4_TCP_I2O_D //remove it once exception node is created -cnat_ipv4_tcp_inside_input_main_t cnat_ipv4_tcp_inside_input_main; -vlib_node_registration_t cnat_ipv4_tcp_inside_input_node; - -#define NSTAGES 6 - -/* - * Use the generic buffer metadata + first line of packet data prefetch - * stage function from <api/pipeline.h>. This is usually a Good Idea. - */ -#define stage0 generic_stage0 - - -static inline void -stage1(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) -{ - u64 a, b, c; - u32 bucket; - u8 *prefetch_target; - //cnat_feature_data_t *fd = (cnat_feature_data_t *)ctx->feature_data; - - - vlib_buffer_t * b0 = vlib_get_buffer (vm, buffer_index); - ipv4_header *ip = vlib_buffer_get_current (b0); - u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2; - tcp_hdr_type *tcp = (tcp_hdr_type *)((u8*)ip + ipv4_hdr_len); - - u64 tmp = 0; - tmp = vnet_buffer(b0)->vcgn_uii.key.k.ipv4 = - clib_net_to_host_u32(ip->src_addr); - vnet_buffer(b0)->vcgn_uii.key.k.port = - clib_net_to_host_u16 (tcp->src_port); - - tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.port) << 32; - - PLATFORM_CNAT_SET_RX_VRF(vnet_buffer(b0)->sw_if_index[VLIB_RX], - vnet_buffer(b0)->vcgn_uii.key.k.vrf, - CNAT_TCP) - tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.vrf) << 48; - - CNAT_V4_GET_HASH(tmp, bucket, CNAT_MAIN_HASH_MASK) - - prefetch_target = (u8 *)(&cnat_in2out_hash[bucket]); - vnet_buffer(b0)->vcgn_uii.bucket = bucket; - - /* Prefetch the hash bucket */ - CLIB_PREFETCH(prefetch_target, CLIB_CACHE_LINE_BYTES, LOAD); -} - -static inline void -stage2(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) -{ /* nothing */ } - - -#define SPP_LOG2_CACHE_LINE_BYTES 6 -#define SPP_CACHE_LINE_BYTES (1 << SPP_LOG2_CACHE_LINE_BYTES) - -static inline void -stage3(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) -{ - vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index); - uword prefetch_target0, prefetch_target1; - u32 bucket = vnet_buffer(b0)->vcgn_uii.bucket; - - /* read the hash bucket */ - u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket - = cnat_in2out_hash[bucket].next; - - if (PREDICT_TRUE(db_index != EMPTY)) { - /* - * Prefetch database keys. We save space by not cache-line - * aligning the DB entries. We don't want to waste LSU - * bandwidth prefetching stuff we won't need. - */ - prefetch_target0 = (uword)(cnat_main_db + db_index); - CLIB_PREFETCH((void*)prefetch_target0, CLIB_CACHE_LINE_BYTES, LOAD); - /* Just beyond DB key #2 */ - prefetch_target1 = prefetch_target0 + - STRUCT_OFFSET_OF(cnat_main_db_entry_t, user_ports); - /* If the targets are in different lines, do the second prefetch */ - if (PREDICT_FALSE((prefetch_target0 & ~(SPP_CACHE_LINE_BYTES-1)) != - (prefetch_target1 & ~(SPP_CACHE_LINE_BYTES-1)))) { - CLIB_PREFETCH((void *)prefetch_target1, CLIB_CACHE_LINE_BYTES, LOAD); - } - } -} - -static inline void -stage4(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) -{ - cnat_main_db_entry_t *db; - vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index); - u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket; - - /* - * Note: if the search already failed (empty bucket), - * the answer is already in the pipeline context structure - */ - if (PREDICT_TRUE(db_index != EMPTY)) { - - /* - * Note: hash collisions suck. We can't easily prefetch around them. - * The first trip around the track will be fast. After that, maybe - * not so much... - */ - do { - db = cnat_main_db + db_index; - if (PREDICT_TRUE(db->in2out_key.key64 == - vnet_buffer(b0)->vcgn_uii.key.key64)) { - break; - } - db_index = db->in2out_hash.next; - } while (db_index != EMPTY); - - /* Stick the answer back into the pipeline context structure */ - vnet_buffer(b0)->vcgn_uii.bucket = db_index; - } -} - - -static inline u32 last_stage (vlib_main_t *vm, vlib_node_runtime_t *node, - u32 bi) -{ - vlib_buffer_t *b0 = vlib_get_buffer (vm, bi); - u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket; - spp_ctx_t *ctx = (spp_ctx_t *) &vnet_buffer(b0)->vcgn_uii; - int disposition = CNAT_V4_TCP_I2O_T; - int counter = CNAT_V4_TCP_I2O_PKT_T; - - ipv4_header *ip = (ipv4_header *)vlib_buffer_get_current(b0); - u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2; - tcp_hdr_type *tcp = (tcp_hdr_type *)((u8*)ip + ipv4_hdr_len); - vlib_node_t *n = vlib_get_node (vm, cnat_ipv4_tcp_inside_input_node.index); - u32 node_counter_base_index = n->error_heap_index; - vlib_error_main_t * em = &vm->error_main; - cnat_session_entry_t *session_db = NULL; - cnat_main_db_entry_t *db = NULL; - cnat_key_t dest_info; - u32 window; - u8 scale; - - - INCREMENT_NODE_COUNTER(CNAT_V4_TCP_I2O_PKT_IN); - - if (PLATFORM_HANDLE_TTL_DECREMENT) { - if (PREDICT_FALSE(ip->ttl <= 1)) { - /* Try to generate ICMP error msg, as TTL is <= 1 */ - - if (icmpv4_generate_with_throttling - (ctx, ip, ctx->ru.rx.uidb_index)) { - - /* Generated ICMP */ - disposition = CNAT_REWRITE_OUTPUT; - counter = CNAT_V4_TCP_I2O_TTL_GEN; - } else { - /* Could not generated ICMP - drop the packet */ - disposition = CNAT_V4_TCP_I2O_D; - counter = CNAT_V4_TCP_I2O_TTL_GEN_DROP; - } - goto drop_pkt; - } - } - - if (PREDICT_FALSE(db_index == EMPTY)) { - /* Deleted fragment code from here */ - disposition = CNAT_V4_TCP_I2O_E; - counter = CNAT_V4_TCP_I2O_EXCEPTION; - } else { - db = cnat_main_db + db_index; - - /* Handle destination sessions */ - dest_info.k.port = clib_net_to_host_u16(tcp->dest_port); - dest_info.k.ipv4 = clib_net_to_host_u32(ip->dest_addr); - - if(PREDICT_TRUE(!PLATFORM_DBL_SUPPORT)) { - - /* No DBL support, so just update the destn and proceed */ - db->dst_ipv4 = dest_info.k.ipv4; - db->dst_port = dest_info.k.port; - goto update_pkt; - } - - if(PREDICT_FALSE(db->dst_ipv4 != dest_info.k.ipv4 || - db->dst_port != dest_info.k.port)) { - if(PREDICT_TRUE(db->nsessions == 0)) { - /* Should be a static entry - * Note this session as the first session and log - */ - cnat_add_dest_n_log(db, &dest_info); - } else if(PREDICT_FALSE(db->nsessions == 1)) { - /* Destn is not same as in main db. Multiple session - * scenario - */ - dest_info.k.vrf = db->in2out_key.k.vrf; - session_db = cnat_handle_1to2_session(db, &dest_info); - if(PREDICT_FALSE(session_db == NULL)) { - disposition = CNAT_V4_TCP_I2O_D; - counter = CNAT_V4_TCP_I2O_SESSION_DROP; - goto drop_pkt; - } - } else { /* There are already multiple destinations */ - dest_info.k.vrf = db->in2out_key.k.vrf; - /* If session already exists, - * cnat_create_session_db_entry will return the existing db - * else create a new db - * If could not create, return NULL - */ - session_db = cnat_create_session_db_entry(&dest_info, - db, TRUE); - if(PREDICT_FALSE(session_db == NULL)) { - disposition = CNAT_V4_TCP_I2O_D; - counter = CNAT_V4_TCP_I2O_SESSION_DROP; - goto drop_pkt; - } - } - if(PREDICT_TRUE(session_db != 0)) { - /* Have to repeat the window size check for new destinations */ - window = (u32)clib_net_to_host_u16(tcp->window_size); - window = window << session_db->scale; - if(PREDICT_TRUE(!session_db->window)) { - calculate_window_scale(tcp, &scale); - session_db->scale = scale; - session_db->window = window; - } else if (PREDICT_FALSE(session_db->window < - window)) { - /* Update the db entry with window option from packet */ - session_db->window = window; - } else { - /* Do nothing */ - } - session_db->tcp_seq_num = clib_net_to_host_u32(tcp->seq_num); - session_db->ack_no = clib_net_to_host_u32(tcp->ack_num); -#if DEBUG > 1 - printf("\n In2out SDB stages seq no = %u," - " ack no = %u, window = %u\n", - session_db->tcp_seq_num, - session_db->ack_no, - session_db->window); -#endif - - } - } else { - //Update the seq no and ack no for subsequent communication - //after connection establishment - //No need to update window here. Window is already updated - //during connection establishment - window = (u32)clib_net_to_host_u16(tcp->window_size); - window = window << db->scale; - if(PREDICT_FALSE(!ALG_ENABLED_DB(db))) { - //This check is done since proto_data is part of union in main - //db entry - db->proto_data.tcp_seq_chk.seq_no = - clib_net_to_host_u32(tcp->seq_num); - db->proto_data.tcp_seq_chk.ack_no = - clib_net_to_host_u32(tcp->ack_num); - } - if (PREDICT_FALSE(db->diff_window < window)) { - /* Update the db entry with window option from packet */ - db->diff_window = window; - } -#if DEBUG > 1 - printf("\n In2out MainDB seq no = %u," - "\n ack no = %u\n", - db->proto_data.tcp_seq_chk.seq_no, - db->proto_data.tcp_seq_chk.ack_no); - printf("\n In2out MAINDB window = %u\n", - db->diff_window); -#endif - } -update_pkt: - - counter = CNAT_V4_TCP_I2O_PKT_T; - disposition = CNAT_V4_TCP_I2O_T; - - /* NO FRAGMENT & ALG HANDLING. DELETING THE CODE */ - - if (PLATFORM_HANDLE_TTL_DECREMENT) { - /* - * Decrement TTL and update IPv4 checksum - */ - ipv4_decr_ttl_n_calc_csum(ip); - } - - tcp_in2out_nat_mss_n_checksum(ip, - tcp, - db->out2in_key.k.ipv4, - db->out2in_key.k.port, - db - /*, db->in2out_key.k.vrf */); - - /* update transaltion counters */ - db->in2out_pkts++; - in2out_forwarding_count++; - - /* update the timer for good mode, or evil mode dst_ip match */ - - if(PREDICT_FALSE(session_db != NULL)) { - V4_TCP_UPDATE_SESSION_DB_FLAG(session_db, tcp); - CNAT_DB_TIMEOUT_RST(session_db); - } else { - V4_TCP_UPDATE_SESSION_FLAG(db, tcp); - CNAT_DB_TIMEOUT_RST(db); - } - } - -drop_pkt: - - em->counters[node_counter_base_index + counter] += 1; - return disposition; -} - -#include <vnet/pipeline.h> - -static uword cnat_ipv4_tcp_inside_input_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return dispatch_pipeline (vm, node, frame); -} - - -VLIB_REGISTER_NODE (cnat_ipv4_tcp_inside_input_node) = { - .function = cnat_ipv4_tcp_inside_input_node_fn, - .name = "vcgn-v4-tcp-i2o", - .vector_size = sizeof (u32), - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(cnat_ipv4_tcp_inside_input_error_strings), - .error_strings = cnat_ipv4_tcp_inside_input_error_strings, - - .n_next_nodes = CNAT_V4_TCP_I2O_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [CNAT_V4_TCP_I2O_E] = "vcgn-v4-tcp-i2o-e", - [CNAT_V4_TCP_I2O_T] = "ip4-input", - [CNAT_V4_TCP_I2O_D] = "error-drop", - }, -}; - -clib_error_t *cnat_ipv4_tcp_inside_input_init (vlib_main_t *vm) -{ - cnat_ipv4_tcp_inside_input_main_t * mp = &cnat_ipv4_tcp_inside_input_main; - - mp->vlib_main = vm; - mp->vnet_main = vnet_get_main(); - - return 0; -} - -VLIB_INIT_FUNCTION (cnat_ipv4_tcp_inside_input_init); |