diff options
Diffstat (limited to 'plugins/vcgn-plugin/vcgn/cnat_bulk_port.c')
| -rw-r--r-- | plugins/vcgn-plugin/vcgn/cnat_bulk_port.c | 964 |
1 files changed, 964 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_bulk_port.c b/plugins/vcgn-plugin/vcgn/cnat_bulk_port.c new file mode 100644 index 00000000000..d8894eb84f5 --- /dev/null +++ b/plugins/vcgn-plugin/vcgn/cnat_bulk_port.c @@ -0,0 +1,964 @@ +/* + *------------------------------------------------------------------ + * cnat_bulk_ports.c - wrappers for bulk port allocation + * + * Copyright (c) 2011-2013 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 <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vppinfra/error.h> +#include <vnet/buffer.h> +#include <vppinfra/vec.h> +#include <vppinfra/hash.h> +#include <vppinfra/pool.h> +#include <vppinfra/bitmap.h> + +#include "cnat_db.h" +#include "cnat_config.h" +#include "cnat_global.h" +#include "cnat_logging.h" +#include "spp_timers.h" +#include "platform_common.h" +#include "cgn_bitmap.h" +#include "spp_platform_trace_log.h" +#include "cnat_ports.h" + +#ifndef NO_BULK_LOGGING + +#define PORT_TO_CACHE(y, z) ((y)/(z)) +/* The last bit (MSB) is used to indicate whether the cache entry is full */ +#define CACHE_TO_PORT(x, z) (((x)& 0x7FFF) * (z)) +#define IS_CACHE_ENTRY_FULL(x) ((x) & 0x8000) +#define MARK_CACHE_ENTRY_AS_FULL(x) ((x) = ((x) | 0x8000)) +#define UNMARK_CACHE_ENTRY_AS_FULL(x) ((x) = ((x) & 0x7FFF)) +#define CACHE_ENTRY_WITHOUT_FULL_STAT(x) ((x) & 0x7FFF) + + +#define NUM_BULK_CHECK 128 /* max number of previous chache to check. + * somewhat orbirtrary.. assume 64 as bulk size.. can handle up + * to 128*64 ports allocated by a single subscriber */ + +/* #define DEBUG_BULK_PORT 1 */ +/* #define DEBUG_BULK_PORT_DETAIL 1 */ +#define HAVE_BULK_PORT_STATS 1 + +#ifdef HAVE_BULK_PORT_STATS +static uword bulk_cache_hit_count; +static uword bulk_port_use_count; +static uword bulk_port_alloc_count; +static uword mapped_port_alloc_count; +#endif /* HAVE_BULK_PORT_STATS */ + +static u32 bulk_port_rand_across; + +void show_bulk_port_allocation(u16 in_vrfid, u32 inside_ip) +{ + cnat_db_key_bucket_t u_ki; + cnat_user_db_entry_t *udb; + int i; + u32 head; + cnat_main_db_entry_t *db = NULL; + i16 printed_so_far = 0; /* entries printed so far */ + u16 prev_bulks[NUM_BULK_CHECK]; + cnat_vrfmap_t *my_vrfmap = 0; + cnat_vrfmap_t *vrfmap = 0; + bulk_alloc_size_t bulk_size; + + u_ki.k.k.vrf = in_vrfid; + u_ki.k.k.ipv4 = inside_ip; + u_ki.k.k.port = 0; + + PLATFORM_DEBUG_PRINT("Searching for user %x in invrf %d\n", + inside_ip, in_vrfid); + udb = cnat_user_db_lookup_entry(&u_ki); + if(!udb) { + PLATFORM_DEBUG_PRINT("No such user\n"); return; + } + + pool_foreach (vrfmap, cnat_map_by_vrf, ({ + if(vrfmap->i_vrf == in_vrfid) { + my_vrfmap = vrfmap; + break; + }})); + + if(!my_vrfmap) { + PLATFORM_DEBUG_PRINT("Vrf map not found\n"); + return; + } + bulk_size = BULKSIZE_FROM_VRFMAP(my_vrfmap); + + if(bulk_size == BULK_ALLOC_SIZE_NONE) { + PLATFORM_DEBUG_PRINT("Bulk allocation not enabled\n"); + return; + } + + PLATFORM_DEBUG_PRINT("\nBulk cache for subscriber 0x%x: ", inside_ip); + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + PLATFORM_DEBUG_PRINT("%d , ", + CACHE_TO_PORT(udb->bulk_port_range_cache[i], bulk_size)); + } + PLATFORM_DEBUG_PRINT("\nNon cached bulk allocation for subscriber 0x%x:\n", + inside_ip); + ASSERT(udb); + memset(prev_bulks, 0,sizeof(prev_bulks)); + + head = udb->translation_list_head_index; + if(PREDICT_FALSE(head == EMPTY)) { + return; + } + db = cnat_main_db + head; + while (1) { + /* skip static ports - static ports may not belong to bulk pool*/ + if(db->out2in_key.k.port < cnat_static_port_range) goto next_entry; + + u16 bm_index = PORT_TO_CACHE(db->out2in_key.k.port, bulk_size); + + /*Check if we have already tested this bulk */ + for(i=0; i < printed_so_far; i++) { + if(prev_bulks[i] == bm_index) goto next_entry; + } + + /*Check if this base port is already part of cache */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(CACHE_ENTRY_WITHOUT_FULL_STAT(udb->bulk_port_range_cache[i]) + == bm_index) { + goto next_entry; + } + } + /* this is not in chache already */ + PLATFORM_DEBUG_PRINT("%d ", CACHE_TO_PORT(bm_index, bulk_size)); + if(printed_so_far < NUM_BULK_CHECK) { + prev_bulks[printed_so_far] = bm_index; + printed_so_far++; + } + +next_entry: + db = cnat_main_db + db->user_ports.next; + /* + * its a circular list, so if we have reached the head again + * all the entries for that user have been read + */ + if (db == (cnat_main_db + head)) { + break; + } + } /* while loop for db entries */ + + PLATFORM_DEBUG_PRINT("\n"); + return; +} + +void show_bulk_port_stats() +{ + + cnat_vrfmap_t *my_vrfmap = 0; + PLATFORM_DEBUG_PRINT("Bulk size settings of each inside vrf ...\n"); + pool_foreach (my_vrfmap, cnat_map_by_vrf, ({ + PLATFORM_DEBUG_PRINT("vrf id %d, bulk size %d\n", my_vrfmap->i_vrf, + BULKSIZE_FROM_VRFMAP(my_vrfmap)); + })); + +#ifdef HAVE_BULK_PORT_STATS + PLATFORM_DEBUG_PRINT("\nBulk port allocation, use and cache hit statistics\n"); + PLATFORM_DEBUG_PRINT("Number of times bulk ports allocated %lld\n", + bulk_port_alloc_count); + PLATFORM_DEBUG_PRINT("Number of times pre-allocated ports used %lld\n", + bulk_port_use_count); + PLATFORM_DEBUG_PRINT( + "Number of times pre-allocated bulk port found from cache %lld\n", + bulk_cache_hit_count); + PLATFORM_DEBUG_PRINT( + "Number of times mapped port (static) allocations made %lld\n", + mapped_port_alloc_count); +#else + PLATFORM_DEBUG_PRINT("\nNat44 bulk port statistics not turned on\n"); +#endif /* HAVE_BULK_PORT_STATS */ +} + +void clear_bulk_port_stats() +{ +#ifdef HAVE_BULK_PORT_STATS + bulk_port_alloc_count = 0; + bulk_port_use_count = 0; + bulk_cache_hit_count = 0; + mapped_port_alloc_count = 0; +#endif /* HAVE_BULK_PORT_STATS */ + return; +} + +void cnat_update_bulk_range_cache(cnat_user_db_entry_t *udb, u16 o_port, + bulk_alloc_size_t bulk_size) +{ + i16 i; + if(!udb) { +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("%s, null udb!\n", __func__); +#endif + return; + } + if(BULK_ALLOC_SIZE_NONE == bulk_size) { /* no bulk logging */ + return; + } + + /* Take care of caching */ + if(o_port & 0x1) { + o_port--; + } + if(PREDICT_FALSE(o_port <= 0)) { +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("%s invalid port: %d\n", __func__, o_port); +#endif + return; + } + + /* First preference is for the cache entry's that are not used yet */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_FALSE( + udb->bulk_port_range_cache[i] == (i16)BULK_RANGE_INVALID)) { + udb->bulk_port_range_cache[i] = PORT_TO_CACHE(o_port, bulk_size); + return; + } + } + + /* Now check if any cache entry is full and if it can be replaced */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_FALSE(IS_CACHE_ENTRY_FULL(udb->bulk_port_range_cache[i]))) { + udb->bulk_port_range_cache[i] = PORT_TO_CACHE(o_port, bulk_size); + return; + } + } + + return; +} + + +void cnat_port_free_v2_bulk ( + cnat_portmap_v2_t *pm, + int index, + port_pair_t ptype, + u16 base_port, + cnat_user_db_entry_t *udb, + u16 static_port_range, + bulk_alloc_size_t bulk_size, + int *nfv9_log_req) +{ + cnat_portmap_v2_t *my_pm; + i16 bm_index; + i16 i; + int unmark_full_status = 0; + + *nfv9_log_req = BULK_ALLOC_NOT_ATTEMPTED; + + /* First free up the port */ + cnat_port_free_v2(pm, index, ptype, base_port, static_port_range); + if(BULK_ALLOC_SIZE_NONE == bulk_size) /* no bulk logging */ + return; + if(PREDICT_FALSE(!udb)) { +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("%s udb is null\n", __func__); +#endif + } + + if(PREDICT_FALSE(base_port < static_port_range)) { + return; + } + /* Now check if cache needs to be removed */ + my_pm = pm + index; + base_port = base_port/bulk_size; + base_port = base_port * bulk_size; /*Align it to multiples of bulk_size */ + if(PREDICT_TRUE(!cgn_clib_bitmap_check_if_all( + my_pm->bm, base_port, bulk_size))) { + *nfv9_log_req = CACHE_ALLOC_NO_LOG_REQUIRED; + unmark_full_status = 1; + /* One or more ports are still in use */ + } else { + *nfv9_log_req = base_port; /* logging required now. indicate base port*/ + } + bm_index = PORT_TO_CACHE(base_port, bulk_size); + /* Now check if this is in the cache */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_FALSE( + CACHE_ENTRY_WITHOUT_FULL_STAT(udb->bulk_port_range_cache[i])) + == bm_index) { + if(unmark_full_status) { + /* Unmark full stat.. if it was marked so..*/ + UNMARK_CACHE_ENTRY_AS_FULL(udb->bulk_port_range_cache[i]); + } else { + udb->bulk_port_range_cache[i] = (i16)BULK_RANGE_INVALID; +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT( + "Clearing cache for client 0x%x, bulk port %d\n", + my_pm->ipv4_address, base_port); +#endif + } + break; + } + } + return; +} + + +/* Get suitable port from range */ +static i16 get_suiting_port_pos_from_range(cnat_portmap_v2_t *my_pm, + u16 bulk_start, i16 bulk_size, port_pair_t pair_type) +{ + i16 num_pos = 0, num_bits, iterations; + uword bulk_ports; + i16 inc = 0; + i16 num_uwords = bulk_size/BITS(my_pm->bm[0]); + + if(PREDICT_FALSE(!num_uwords)) { + iterations = 0; + num_bits = bulk_size; + bulk_size = 0; + } else { + bulk_port_rand_across = randq1(bulk_port_rand_across); + iterations = bulk_port_rand_across % num_uwords; + num_bits = BITS(my_pm->bm[0]); + } + + do { + bulk_ports = cgn_clib_bitmap_get_bits(my_pm->bm, + (bulk_start + iterations * BITS(my_pm->bm[0])), num_bits); +#ifdef DEBUG_BULK_PORT_DETAIL + PLATFORM_DEBUG_PRINT("%s %d, bulk start %d, num_bits %d, ports %lld \n", + __func__, __LINE__, bulk_start, num_bits, bulk_ports); +#endif /* DEBUG_BULK_PORT_DETAIL */ + if(PREDICT_FALSE(!bulk_ports)) goto next_uword; + if(PREDICT_TRUE((pair_type == PORT_SINGLE) + || (pair_type == PORT_PAIR))) { + num_pos =0; + inc = 1; + } else if(pair_type == PORT_S_ODD) { + num_pos = 1; + inc = 2; + } else if(pair_type == PORT_S_EVEN) { + num_pos =0; + inc = 2; + } + + for(; num_pos < num_bits; num_pos = num_pos + inc) { + if(!((bulk_ports >> num_pos) & 1)) + continue; /* In use */ + /* Check if the available port meets our + * criteria such as add, even, pair etc */ + else if(PREDICT_FALSE( + (pair_type == PORT_PAIR) && ((num_pos & 0x1) || + (!((bulk_ports >> (num_pos + 1)) & 1))))) + continue; + else break; /* Found one that meets the criteria */ + } + if(num_pos < num_bits) + return (num_pos + iterations * BITS(my_pm->bm[0])); +next_uword: + num_bits = BITS(my_pm->bm[0]); + bulk_size -= BITS(my_pm->bm[0]); + iterations++; + if(iterations >= num_uwords) iterations = 0; + } while (bulk_size > 0); + + return -2; /* nothing found */ +} + +static cnat_errno_t try_bulk_port_from_non_cache( + cnat_user_db_entry_t *udb, + cnat_portmap_v2_t *my_pm, + port_pair_t pair_type, + bulk_alloc_size_t bulk_size, + u16 *port_available, + u16 static_port_range + ) +{ + /**** + 1. user should have existing translations.. otherwise, we wouldn't get here. + 2. For each, get the outside port. get the base port. + check if it is already in cache + 3. if not, we stand chance. + 4. Check for availability from this non cached pool. + 5. if found, repalce this with one of the cache that is invalid or full?? + 6. if we are replacing the cache.. it has to be governed by user + preference on prefer oldest pool or prefer newest pool + ********/ + u32 head; + cnat_main_db_entry_t *db = NULL; + u16 bulk_start; /* start point in 64 bitmap array to search for port */ + i16 port_pos; /* indicates the position of available port in bulk */ + i16 i; /* just a counter */ + i16 attempts_so_far = 0; /* (futile-;) attemps so far..*/ + u16 prev_bulks[NUM_BULK_CHECK]; + ASSERT(udb); + memset(prev_bulks, 0,sizeof(prev_bulks)); + + head = udb->translation_list_head_index; + if(PREDICT_FALSE(head == EMPTY)) return CNAT_NO_PRE_ALLOCATED_BULK_PORTS; + + db = cnat_main_db + head; + while (1) { //what should be the limit?? + + /* skip static ports - static ports may not belong to bulk pool*/ + if(db->out2in_key.k.port < static_port_range) goto next_entry; + + u16 bm_index = PORT_TO_CACHE(db->out2in_key.k.port, bulk_size); + + /*Check if we have already tested this bulk */ + for(i=0; i < attempts_so_far; i++) { + if(prev_bulks[i] == bm_index) { + goto next_entry; + } + } + + /*Check if this base port is already part of cache */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(CACHE_ENTRY_WITHOUT_FULL_STAT(udb->bulk_port_range_cache[i]) + == bm_index) + goto next_entry; + } + + /* this is not in chache already */ + bulk_start = CACHE_TO_PORT(bm_index, bulk_size); + port_pos = get_suiting_port_pos_from_range(my_pm, + bulk_start, bulk_size, pair_type); + + if(port_pos < 0) { /* no port available in this range */ + /* Mark this bulk so that we don't have to try this again */ + if(attempts_so_far < NUM_BULK_CHECK) { + prev_bulks[attempts_so_far] = bm_index; + attempts_so_far++; + } + goto next_entry; + } + + /* Got one...Get the port number */ + *port_available = bulk_start + port_pos; + + /* Check to see if we shoud replace one of the cache */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_FALSE((udb->bulk_port_range_cache[i] + == (i16)BULK_RANGE_INVALID) || ( + IS_CACHE_ENTRY_FULL(udb->bulk_port_range_cache[i])))) { + udb->bulk_port_range_cache[i] = bm_index; + return CNAT_SUCCESS; + } + } + /* Check to replace an existing (in use) entry */ + /* TODO: enforce policy */ + /* order of looping should depend on policy */ + + return CNAT_SUCCESS; + +next_entry: + db = cnat_main_db + db->user_ports.next; + /* + * its a circular list, so if we have reached the head again + * all the entries for that user have been read + */ + if (db == (cnat_main_db + head)) { + break; + } + } /* while loop for db entries */ + /* no ports available from pre allocated bulk pool */ + return CNAT_NO_PORT_FROM_BULK; +} + +cnat_errno_t +cnat_dynamic_port_alloc_v2_bulk ( + cnat_portmap_v2_t *pm, + port_alloc_t atype, + port_pair_t pair_type, + u32 *index, + u32 *o_ipv4_address, + u16 *o_port, + u16 static_port_range, + cnat_user_db_entry_t *udb, + bulk_alloc_size_t bulk_size, + int *nfv9_log_req, + u16 ip_n_to_1, + u32 *rseed_ip + ) +{ + + cnat_errno_t rv; + u16 port_available = 0; + i16 i; + cnat_portmap_v2_t *my_pm; + + if((BULK_ALLOC_SIZE_NONE != bulk_size) /* bulk logging enabled */ + && (udb)) { /* This user does have translations already */ + u16 bulk_start; + i16 port_pos; + + my_pm = pm + *index; + /* We have a case to check if bulk allocated ports can be used */ + /* TODO: order of looping to be based on policy + * like prefer older or prefer newer ?? + * For now, start with most recent cache entry + * so that we stand a better chance of + * finding a port + */ + for(i= 0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_TRUE((udb->bulk_port_range_cache[i] == + (i16)BULK_RANGE_INVALID) || + IS_CACHE_ENTRY_FULL(udb->bulk_port_range_cache[i]))) { + continue; /* This range is not initialized yet or it is full */ + } + bulk_start = CACHE_TO_PORT(udb->bulk_port_range_cache[i], + bulk_size); + port_pos = get_suiting_port_pos_from_range(my_pm, + bulk_start, bulk_size, pair_type); + if(PREDICT_FALSE(port_pos < 0)) { + /* Mark this cache entry as full so that we do not + * waste time on this entry again */ + MARK_CACHE_ENTRY_AS_FULL(udb->bulk_port_range_cache[i]); +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("Marked bulk cache entry %d as full for %x \n", + i, my_pm->ipv4_address); +#endif /* #ifdef DEBUG_BULK_PORT */ + continue; + } + /* Get the port number */ + port_available = bulk_start+ port_pos; +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT( + "Found port from cache : IP 0x%x, port %d %d iterations\n", + my_pm->ipv4_address, port_available, i) +#endif +#ifdef HAVE_BULK_PORT_STATS + bulk_cache_hit_count++; +#endif /* HAVE_BULK_PORT_STATS */ + break; + } /* end of for loop for cache check */ + /* If we have not found a port yet, check if we can have + * pre allocated bulk port from non-cache */ + if(PREDICT_FALSE(i == BULK_RANGE_CACHE_SIZE)) { + if( try_bulk_port_from_non_cache(udb, my_pm, pair_type, + bulk_size, &port_available, + static_port_range) != CNAT_SUCCESS ) { + goto ALLCOATE_NEW_BULK; + } +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("Found port from non-cache : IP 0x%x, port %d\n", + my_pm->ipv4_address, port_available); +#endif + } + /* Assign the port, mark it as in use */ + cgn_clib_bitmap_clear_no_check(my_pm->bm, port_available); + (my_pm->inuse)++; + if(PREDICT_FALSE(pair_type == PORT_PAIR)) {/* Mark the next one too */ + cgn_clib_bitmap_clear_no_check(my_pm->bm, port_available + 1); + (my_pm->inuse)++; + } + *o_ipv4_address = my_pm->ipv4_address; + *o_port = port_available; + *nfv9_log_req = CACHE_ALLOC_NO_LOG_REQUIRED; +#ifdef HAVE_BULK_PORT_STATS + bulk_port_use_count++; +#endif /* HAVE_BULK_PORT_STATS */ + return (CNAT_SUCCESS); + } +ALLCOATE_NEW_BULK: +#ifdef DEBUG_BULK_PORT + if(BULK_ALLOC_SIZE_NONE != bulk_size) { + PLATFORM_DEBUG_PRINT( + "No port available from bulk cache, bulk size %d\n", bulk_size); + } +#endif + /* For whatever reason, we have not got a port yet */ + rv = cnat_dynamic_port_alloc_v2(pm, atype, pair_type, index, + o_ipv4_address, o_port, static_port_range, bulk_size, nfv9_log_req, + ip_n_to_1, rseed_ip); + if (PREDICT_FALSE(rv != CNAT_SUCCESS)) { + return rv; + } + /* Take care of caching */ + if(PREDICT_FALSE(udb != NULL)) { + /* Predict false because, we usually allocate for new users */ + cnat_update_bulk_range_cache(udb, *o_port, bulk_size); + } +#ifdef HAVE_BULK_PORT_STATS + bulk_port_alloc_count++; +#endif /* HAVE_BULK_PORT_STATS */ + return (CNAT_SUCCESS); +} + + +cnat_errno_t +cnat_static_port_alloc_v2_bulk ( + cnat_portmap_v2_t *pm, + port_alloc_t atype, + port_pair_t pair_type, + u32 i_ipv4_address, + u16 i_port, + u32 *index, + u32 *o_ipv4_address, + u16 *o_port, + u16 static_port_range, + cnat_user_db_entry_t *udb, + bulk_alloc_size_t bulk_size, + int *nfv9_log_req, + u16 ip_n_to_1 + ) +{ + + /*** + * Requirements - + * 1. If the port allocated is below dyn start, it should be individual + * port (not bulk) + * 2. If NOT, it should be bulk allocated + * 3. Try and keep the inside port same as outside port in both the + * cases (best effort) + + * Algorithm + * 1. Check if it is below stat port start or user is new or bulk is + * disabled. If yes, call existing function + * 2. If not, see if we can pick from bulk and yet try to keep the port + * same - difficult thing - check if the port is free - then check if the + * entire bulk is free - if not check if bulk is owned by the user already. + * If all of these fail, call existing function to allocate a new bulk + * 3. Update cache, etc return log requirements + *****/ + + cnat_errno_t rv; + i16 i; + u32 head; + cnat_portmap_v2_t *my_pm; + uword bit_test_result, start_bit; + cnat_main_db_entry_t *db = NULL; + + if((BULK_ALLOC_SIZE_NONE != bulk_size) /* bulk logging enabled */ + && (udb) && /* This user does have translations already */ + i_port >= static_port_range ) { /* It is outside stat port range*/ + + my_pm = pm + *index; + /* We have a case to check if bulk allocated ports can be used */ + + /* First check if the required port is available. */ + if(PREDICT_FALSE(clib_bitmap_get_no_check(my_pm->bm, i_port) == 0)) { + goto ALLOCATE_NEW_BULK_STATIC; + } + + /* Port is free.. check if the bulk is also free */ + start_bit= ((i_port/bulk_size) * bulk_size); + bit_test_result = cgn_clib_bitmap_check_if_all(my_pm->bm, + start_bit, bulk_size); + if(PREDICT_TRUE(bit_test_result)) { /* bulk is available, grab it */ + goto ALLOCATE_NEW_BULK_STATIC; + } + + /* else, bulk is taken by someone. check if it is me */ + /* Check if we own the bulk by any chance */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(udb->bulk_port_range_cache[i] == start_bit) break; + } + if(i == BULK_RANGE_CACHE_SIZE) { /* no luck with cache */ + head = udb->translation_list_head_index; + if(PREDICT_FALSE(head == EMPTY)) + goto ALLOCATE_NEW_BULK_STATIC; + db = cnat_main_db + head; + i = 0; + while(1) { + if((db->out2in_key.k.port/bulk_size) * bulk_size == start_bit) { + i = 1; /* Just to indicate it is found */ + break; + } + db = cnat_main_db + db->user_ports.next; + /* + * its a circular list, so if we have reached the head again + * all the entries for that user have been read + */ + if (db == (cnat_main_db + head)) break; + } /* while loop for db entries */ + if(!i) { + goto ALLOCATE_NEW_BULK_STATIC; + } + } + /* Assign the port, mark it as in use */ + cgn_clib_bitmap_clear_no_check(my_pm->bm, i_port); + (my_pm->inuse)++; + *o_ipv4_address = my_pm->ipv4_address; + *o_port = i_port; + *nfv9_log_req = CACHE_ALLOC_NO_LOG_REQUIRED; +#ifdef HAVE_BULK_PORT_STATS + bulk_port_use_count++; +#endif /* HAVE_BULK_PORT_STATS */ + +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("%s, %d, found stat port from bulk: %x, %d\n", + __func__, + __LINE__, *o_ipv4_address, *o_port); +#endif /* DEBUG_BULK_PORT */ + return (CNAT_SUCCESS); + } + +ALLOCATE_NEW_BULK_STATIC: +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("%s No port available from bulk cache, bulk size %d\n", + __func__,bulk_size); +#endif + /* For whatever reason, we have not got a port yet */ + rv = cnat_static_port_alloc_v2(pm, atype, pair_type, i_ipv4_address, + i_port, index, o_ipv4_address, o_port, static_port_range, + bulk_size, nfv9_log_req,ip_n_to_1); + if (PREDICT_FALSE(rv != CNAT_SUCCESS)) { + return rv; + } + /* Take care of caching only if it was a bulk alloc */ + if(PREDICT_FALSE(udb && (BULK_ALLOC_NOT_ATTEMPTED != *nfv9_log_req))) { + cnat_update_bulk_range_cache(udb, *o_port, bulk_size); + } +#ifdef HAVE_BULK_PORT_STATS + bulk_port_alloc_count++; +#endif /* HAVE_BULK_PORT_STATS */ + return (CNAT_SUCCESS); + +} + +cnat_errno_t +cnat_mapped_static_port_alloc_v2_bulk ( + cnat_portmap_v2_t *pm, + port_alloc_t atype, + u32 *index, + u32 ipv4_address, + u16 port, + cnat_user_db_entry_t *udb, + bulk_alloc_size_t bulk_size, + int *nfv9_log_req, + u16 ip_n_to_1 + ) +{ + /* Requirements : + * 1. Check if bulk allocation is required. + * 2. Call cnat_mapped_static_port_alloc_v2 to allocate + * 3. Decide if alloc has to be cached + * 4. Update nfv9_log_req + */ + cnat_errno_t rv; + rv = cnat_mapped_static_port_alloc_v2 (pm, + atype, index, ipv4_address, port, nfv9_log_req, bulk_size, ip_n_to_1); + if (PREDICT_FALSE(rv != CNAT_SUCCESS)) { + return rv; + } + /* Take care of caching only if it was a bulk alloc */ + if(PREDICT_FALSE(udb && (BULK_ALLOC_NOT_ATTEMPTED != *nfv9_log_req))) { + int i; + port = port*bulk_size; + port = port/bulk_size; /* align it to bulk size boundary */ + for(i=0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(CACHE_ENTRY_WITHOUT_FULL_STAT(udb->bulk_port_range_cache[i]) + == PORT_TO_CACHE(port, bulk_size)) + break; + } + if( i == BULK_RANGE_CACHE_SIZE) { /* else, it is alredy in cache */ + cnat_update_bulk_range_cache(udb, port, bulk_size); + } + } +#ifdef HAVE_BULK_PORT_STATS + mapped_port_alloc_count++; +#endif /* HAVE_BULK_PORT_STATS */ + return (CNAT_SUCCESS); +} + + +cnat_errno_t +cnat_dynamic_port_alloc_rtsp_bulk ( + cnat_portmap_v2_t *pm, + port_alloc_t atype, + port_pair_t pair_type, + u16 i_port, + u32 *index, + u32 *o_ipv4_address, + u16 *o_port, + u16 static_port_range, + cnat_user_db_entry_t *udb, + bulk_alloc_size_t bulk_size, + int *nfv9_log_req, + u32 *rseed_ip) +{ + + /*** + * Algorithm + * 1. Compute the range of ports required based on the number of digits + * in the port request made by the client. + * 2. Check if bulk logging is enabled. If not, use the existing method. + * 3. Check if there are 2 adjacent ports available that meet the above + * criteria in any of the bulk allocations made already. + * 4. If yes, mark them in use and return. + * 5. If not allocate a new bulk and pick 2 ports in it + ***/ + + i16 i; + cnat_portmap_v2_t *my_pm = 0; + u32 start_port1, end_port1, start_port2, end_port2; + int range_loop; + u16 bulk_start; + i16 port_pos; + u16 port_available = 0; + + ASSERT(index); + ASSERT(o_ipv4_address); + ASSERT(o_port); + + /* + * Check if the port is 4 digit or 5 digit. I am assuming we are + * not getting 3 (or 2 or 1) digit ports, which we cannot anyway + * allocate same sized outside ports - as outside ports start from 1024 + * + * Static Port has its own reserved range. Ensure that the range is + * such that atleast few 4 digit ports are available for RTSP. If + * not it does not make sense to do special allocation for RTSP. + */ + if (PREDICT_TRUE(static_port_range < MIN_STATIC_PORT_RANGE_FOR_RTSP)) { + /* + * 4 digit port or less + */ + if (i_port <= 9999) { + start_port1 = static_port_range; + end_port1 = 9999; + + start_port2 = 10000; + end_port2 = PORTS_PER_ADDR - 1; + } else { /* 5 digit port */ + start_port1 = 10000; + end_port1 = PORTS_PER_ADDR - 1; + + start_port2 = static_port_range; + end_port2 = 9999; + } + } else { /* Static port range is too big */ + start_port1 = static_port_range; + end_port1 = PORTS_PER_ADDR - 1; + + /* + * PORTS_PER_ADDR is just a placeholder for + * INVALID_PORT, valid ports are b/w 1 and PORTS_PER_ADDR + */ + start_port2 = PORTS_PER_ADDR; + end_port2 = PORTS_PER_ADDR; + } + + + if(PREDICT_TRUE(udb != NULL)) { + my_pm = pm + *index; + } + + /* Now check if this user already owns a bulk range that is + * within start range 1 + */ + + u32 start_range = start_port1; + u32 end_range = end_port1; + for(range_loop = 0; range_loop < 2; range_loop++) { + if((BULK_ALLOC_SIZE_NONE == bulk_size) || (!udb)) { + goto ALLOCATE_NEW_RTSP_PORTS; + } + for(i= 0; i < BULK_RANGE_CACHE_SIZE; i++) { + if(PREDICT_TRUE((udb->bulk_port_range_cache[i] == + (i16)BULK_RANGE_INVALID) || + IS_CACHE_ENTRY_FULL(udb->bulk_port_range_cache[i]))) { + continue; /* This range is not initialized yet or it is full */ + } + + bulk_start = CACHE_TO_PORT(udb->bulk_port_range_cache[i], + bulk_size); + if(bulk_start < start_port1 || bulk_start >= end_port1) { + continue; /* Not in the range */ + } + + port_pos = get_suiting_port_pos_from_range(my_pm, + bulk_start, bulk_size, pair_type); + if(PREDICT_FALSE(port_pos < 0)) { + /* Not Marking this cache entry as full as it failed + * for pair type. It might have individual entries + */ + continue; + } + /* Get the port number */ + port_available = bulk_start+ port_pos; +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT( + "Found port from cache : IP 0x%x, port %d %d iterations\n", + my_pm->ipv4_address, port_available, i) +#endif +#ifdef HAVE_BULK_PORT_STATS + bulk_cache_hit_count += 2; +#endif /* HAVE_BULK_PORT_STATS */ + break; + } /* end of for loop for cache check */ + + if(PREDICT_FALSE(i == BULK_RANGE_CACHE_SIZE)) { + /* we have not found a port yet, but to do not want to try + * non-cache bulks.. because, it is a very low probability and + * do not want to tweak that code for this special case + * The impact of non checking the non-cache is, we give this + * user few extra ports .. which is OK + */ + goto ALLOCATE_NEW_RTSP_PORTS; + } +#ifdef DEBUG_BULK_PORT + PLATFORM_DEBUG_PRINT("RTSP: Found port from non-cache : IP 0x%x, port %d\n", + my_pm->ipv4_address, port_available); +#endif + + /* Assign the port, mark it as in use */ + cgn_clib_bitmap_clear_no_check(my_pm->bm, port_available); + (my_pm->inuse)++; + cgn_clib_bitmap_clear_no_check(my_pm->bm, port_available + 1); + (my_pm->inuse)++; + + *o_ipv4_address = my_pm->ipv4_address; + *o_port = port_available; + *nfv9_log_req = CACHE_ALLOC_NO_LOG_REQUIRED; +#ifdef HAVE_BULK_PORT_STATS + bulk_port_use_count += 2; +#endif /* HAVE_BULK_PORT_STATS */ + return (CNAT_SUCCESS); + +ALLOCATE_NEW_RTSP_PORTS: + /* No luck. Let's try allocating new bulk.. */ + if(PREDICT_TRUE(CNAT_SUCCESS == cnat_dynamic_port_alloc_rtsp + (pm, atype, pair_type, + start_range, end_range,index, o_ipv4_address, + o_port, bulk_size, nfv9_log_req,rseed_ip))) { + if(PREDICT_FALSE(udb && + (BULK_ALLOC_NOT_ATTEMPTED != *nfv9_log_req))) { + cnat_update_bulk_range_cache(udb, *o_port, bulk_size); + } +#ifdef HAVE_BULK_PORT_STATS + bulk_port_alloc_count++; +#endif /* HAVE_BULK_PORT_STATS */ + return CNAT_SUCCESS; + } + + /* Could not allocate in range 1.. so move to range 2. */ + start_range = start_port2; + end_range = end_port2; + + } + + return (CNAT_NOT_FOUND_DIRECT); /* if we are here, we could not get any ports */ + +} + +#else /* Dummy definitions */ +void show_bulk_port_stats() +{ + PLATFORM_DEBUG_PRINT("\nBulk logging feature not included\n"); +} + + void clear_bulk_port_stats() +{ + PLATFORM_DEBUG_PRINT("\nBulk logging feature not included\n"); +} +#endif /* NO_BULK_LOGGING */ |