diff options
Diffstat (limited to 'plugins/vcgn-plugin/vcgn/cnat_va_db.c')
| -rw-r--r-- | plugins/vcgn-plugin/vcgn/cnat_va_db.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_va_db.c b/plugins/vcgn-plugin/vcgn/cnat_va_db.c new file mode 100644 index 00000000000..7423bdf2de2 --- /dev/null +++ b/plugins/vcgn-plugin/vcgn/cnat_va_db.c @@ -0,0 +1,286 @@ +/* + *------------------------------------------------------------------ + * cnat_va_db.c - virtual assembly database + * + * Copyright (c) 2009, 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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <cnat_va_db.h> +#include <format.h> +#include <spp_node.h> +#include <spp_alloc.h> +#include <spp_byteorder.h> +#include <spp_main.h> +#include <spp_cache.h> +#include <spp_interface.h> +#include <spp_api.h> +#include <spp_client_api.h> +#include <spp_timers.h> +#include <cnat_db.h> +#include <spp_plugin.h> +#include <cnat_v4_functions.h> + + +va_bucket_t va_bucket[VA_BUCKETS]; + +void va_bucket_init () { + + u32 i; + + /* + * set the pointer in each bucket + * points to nowhere + */ + for (i=0; i<VA_BUCKETS; i++) { + va_bucket[i].next_available_entry = ~0; + } + +} + +inline void va_db_add_new_entry (u32 bucket_index, + va_lookup_key * key ) +{ + + va_entry_t * entry_p; + u32 head, next; + + entry_p = va_db_lookup(bucket_index, key); + + if (PREDICT_FALSE(entry_p)) { + FRAG_DEBUG_PRINTF6( + "\nVA_ADD_NEW: Bucket %d fnd Existng entry [%d, %d] -> [%d, %d]\n", + bucket_index, entry_p->src_port, + entry_p->dst_port, key->e.src_port, key->e.dst_port) + + /* found match entry, update it */ + entry_p->src_port = key->e.src_port; + entry_p->dst_port = key->e.dst_port; + + FRAG_DEBUG_PRINTF3("VA_ADD_NEW: Existing bucket %d, counter %d\n", + bucket_index, + va_bucket[bucket_index].new_entry_counter) + + } else { + + /* no match, add a new one */ + head = va_bucket[bucket_index].head_entry; + next = va_bucket[bucket_index].next_available_entry; + + FRAG_DEBUG_PRINTF5( + "\nVA_ADD_NEW: Filling bucket %d, index %d with key 0x%llx %x\n", + bucket_index, next, key->k.key64, key->k.key32) + + va_bucket[bucket_index].va_entry[next] = key->e; + + /* increase next pointer */ + va_bucket[bucket_index].next_available_entry = (next+1) & VA_BUCKET_MASK; + + if (PREDICT_FALSE(head == va_bucket[bucket_index].next_available_entry)) { + /* adjust head circular pointer */ + va_bucket[bucket_index].head_entry = (head+1) & VA_BUCKET_MASK; + } + + va_bucket[bucket_index].new_entry_counter++; + + FRAG_DEBUG_PRINTF4( + "VA_ADD_NEW: NEW bucket %d, entry %d counter %d\n", + bucket_index, next, va_bucket[bucket_index].new_entry_counter) + } +} + + +/* + * use the key, + * return pointer to the entry if found, + * NULL if not + */ + +inline +va_entry_t * va_db_lookup (u32 bucket_index, va_lookup_key * key) +{ + + u32 index, next; + va_entry_t * entry_p; + va_bucket_t * bucket; + + bucket = &va_bucket[bucket_index]; + index = bucket->head_entry; + next = bucket->next_available_entry; + entry_p = NULL; + + FRAG_DEBUG_PRINTF4( + "\nVA_DB_LOOKUP: bucket index %d head %d next %d\n", + bucket_index, index, next) + + /* loop through the entries in the bucket */ + while( index != next) { + + if(PREDICT_TRUE(memcmp(&bucket->va_entry[index], key, VA_KEY_SIZE)==0)) { + + entry_p = &bucket->va_entry[index]; + /*In add frag entry function we are again assigning key's src + port to entry_p's src port. So when a main DB entry is deleted/ + timed out, and again another entry is created for the same + src ip and src port pair, the frag's entry_p will have the + previous port info stored and not updated. Hence the below + line is not required*/ + + /* *(u32*)&key->e.src_port = *(u32*)&entry_p->src_port; */ + /* do two ports as u32 :) */ + + break; + } + + index = (index +1) & VA_BUCKET_MASK; + + } + +#ifdef FRAG_DEBUG + if (PREDICT_TRUE(entry_p)) { + FRAG_DEBUG_PRINTF3("VA_DB_LOOKUP: bucket index %d entry index %d\n", + bucket_index, index) + FRAG_DEBUG_PRINTF5("VA_DB_LOOKUP: SRC-->DST [0x%x, %d] [0x%x, %d]\n", + entry_p->src_ip, entry_p->src_port, + entry_p->dst_ip, entry_p->dst_port) + FRAG_DEBUG_PRINTF3("[vrf 0x%x, id 0x%x]\n", + entry_p->vrf, entry_p->ip_id) + } else { + FRAG_DEBUG_PRINTF1("\nNULL ENTRY\n") + } +#endif + + return entry_p; + +} + +inline +int va_db_delete_entry (u32 bucket_index, va_lookup_key * key) +{ + + u32 index, next; + int entry_found = 0; + va_bucket_t * bucket; + + bucket = &va_bucket[bucket_index]; + index = bucket->head_entry; + next = bucket->next_available_entry; + + FRAG_DEBUG_PRINTF4( + "\nVA_DB_DELETE_ENTRY: bucket index %d head %d next %d\n", + bucket_index, index, next); + + /* loop through the entries in the bucket */ + while( index != next) { + if(PREDICT_TRUE(memcmp(&bucket->va_entry[index], key, + VA_KEY_SIZE)==0)) { + /* Clear the entry */ + FRAG_DEBUG_PRINTF1("Entry found in delete API"); + memset(&bucket->va_entry[index], 0, sizeof(va_entry_t)); + entry_found = 1; + break; + } + index = (index +1) & VA_BUCKET_MASK; + } + return entry_found; +} + + + +void cnat_va_bucket_used (int argc, unsigned long * argv) +{ + + u32 i, sum = 0;; + + for(i=0;i<VA_BUCKETS;i++) { + + if(PREDICT_TRUE(va_bucket[i].new_entry_counter)) sum++; + + } + + if (PREDICT_FALSE(!sum)) { + printf("no bucket in use\n"); + return; + } + + printf("index head next counter (%d bucket in use)\n", sum); + + for(i=0;i<VA_BUCKETS;i++) { + + if (PREDICT_FALSE(!va_bucket[i].new_entry_counter)) continue; + + printf(" %04d %04d %04d %d\n", i, + va_bucket[i].head_entry, + va_bucket[i].next_available_entry, + va_bucket[i].new_entry_counter); + + } +} + +void cnat_va_dump (int argc, unsigned long * argv) +{ + + u32 i, sum, index ; + + PLATFORM_DEBUG_PRINT("====== SUMMARY ======\n"); + PLATFORM_DEBUG_PRINT("Total buckets: %d\n", VA_BUCKETS); + PLATFORM_DEBUG_PRINT("Entries per bucket: %d\n", VA_ENTRY_PER_BUCKET); + + sum = 0; + + for(i=0; i<VA_BUCKETS; i++) { + if (PREDICT_TRUE(va_bucket[i].new_entry_counter > 0)) sum ++; + } + + PLATFORM_DEBUG_PRINT("buckets in use: %d\n", sum); + + sum = 0; + for(i=0; i<VA_BUCKETS; i++) { + + if ( PREDICT_FALSE(((va_bucket[i].next_available_entry+1) & VA_BUCKET_MASK) + == va_bucket[i].head_entry)) { + + sum ++; + } + } + + PLATFORM_DEBUG_PRINT("bucket full: %d\n", sum); + + /* dump per bucket info */ + + if (argc == 0 ) return; + + index = (u32) argv[0]; + + if (PREDICT_FALSE(index >= VA_BUCKETS)) { + PLATFORM_DEBUG_PRINT("invalid bucket index %d\n", index); + return; + } + + PLATFORM_DEBUG_PRINT("\n====== Bucket %d ======\n", index); + + PLATFORM_DEBUG_PRINT("bucket head index %d\n", va_bucket[index].head_entry); + + PLATFORM_DEBUG_PRINT("bucket next index %d\n", va_bucket[index].next_available_entry); + + PLATFORM_DEBUG_PRINT(" source IP dest IP VRF ip-id srcP dstP\n"); + + for(i=0;i<VA_ENTRY_PER_BUCKET;i++) { + hex_dump((u8*)&va_bucket[index].va_entry[i], sizeof(va_entry_t)); + } + +} |