diff options
Diffstat (limited to 'src/vnet/session/transport.c')
| -rw-r--r-- | src/vnet/session/transport.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/vnet/session/transport.c b/src/vnet/session/transport.c new file mode 100644 index 00000000000..fc722e45668 --- /dev/null +++ b/src/vnet/session/transport.c @@ -0,0 +1,306 @@ +/* + * 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 <vnet/session/transport_interface.h> +#include <vnet/session/session.h> +#include <vnet/fib/fib.h> + +/** + * Per-type vector of transport protocol virtual function tables + */ +transport_proto_vft_t *tp_vfts; + +/* + * Port allocator seed + */ +static u32 port_allocator_seed; + +/* + * Local endpoints table + */ +static transport_endpoint_table_t local_endpoints_table; + +/* + * Pool of local endpoints + */ +static transport_endpoint_t *local_endpoints; + +/* + * Local endpoints pool lock + */ +static clib_spinlock_t local_endpoints_lock; + + +u32 +transport_endpoint_lookup (transport_endpoint_table_t * ht, u8 proto, + ip46_address_t * ip, u16 port) +{ + clib_bihash_kv_24_8_t kv; + int rv; + + kv.key[0] = ip->as_u64[0]; + kv.key[1] = ip->as_u64[1]; + kv.key[2] = (u64) port << 8 | (u64) proto; + + rv = clib_bihash_search_inline_24_8 (ht, &kv); + if (rv == 0) + return kv.value; + + return ENDPOINT_INVALID_INDEX; +} + +void +transport_endpoint_table_add (transport_endpoint_table_t * ht, u8 proto, + transport_endpoint_t * te, u32 value) +{ + clib_bihash_kv_24_8_t kv; + + kv.key[0] = te->ip.as_u64[0]; + kv.key[1] = te->ip.as_u64[1]; + kv.key[2] = (u64) te->port << 8 | (u64) proto; + kv.value = value; + + clib_bihash_add_del_24_8 (ht, &kv, 1); +} + +void +transport_endpoint_table_del (transport_endpoint_table_t * ht, u8 proto, + transport_endpoint_t * te) +{ + clib_bihash_kv_24_8_t kv; + + kv.key[0] = te->ip.as_u64[0]; + kv.key[1] = te->ip.as_u64[1]; + kv.key[2] = (u64) te->port << 8 | (u64) proto; + + clib_bihash_add_del_24_8 (ht, &kv, 0); +} + +/** + * Register transport virtual function table. + * + * @param type - session type (not protocol type) + * @param vft - virtual function table + */ +void +transport_register_protocol (transport_proto_t transport_proto, u8 is_ip4, + const transport_proto_vft_t * vft) +{ + u8 session_type; + session_type = session_type_from_proto_and_ip (transport_proto, is_ip4); + + vec_validate (tp_vfts, session_type); + tp_vfts[session_type] = *vft; + + /* If an offset function is provided, then peek instead of dequeue */ + session_manager_set_transport_rx_fn (session_type, + vft->tx_fifo_offset != 0); +} + +/** + * Get transport virtual function table + * + * @param type - session type (not protocol type) + */ +transport_proto_vft_t * +transport_protocol_get_vft (u8 session_type) +{ + if (session_type >= vec_len (tp_vfts)) + return 0; + return &tp_vfts[session_type]; +} + +#define PORT_MASK ((1 << 16)- 1) + +void +transport_endpoint_del (u32 tepi) +{ + clib_spinlock_lock_if_init (&local_endpoints_lock); + pool_put_index (local_endpoints, tepi); + clib_spinlock_unlock_if_init (&local_endpoints_lock); +} + +always_inline transport_endpoint_t * +transport_endpoint_new (void) +{ + transport_endpoint_t *tep; + pool_get (local_endpoints, tep); + return tep; +} + +void +transport_endpoint_cleanup (u8 proto, ip46_address_t * lcl_ip, u16 port) +{ + u32 tepi; + transport_endpoint_t *tep; + + /* Cleanup local endpoint if this was an active connect */ + tepi = transport_endpoint_lookup (&local_endpoints_table, proto, lcl_ip, + clib_net_to_host_u16 (port)); + if (tepi != ENDPOINT_INVALID_INDEX) + { + tep = pool_elt_at_index (local_endpoints, tepi); + transport_endpoint_table_del (&local_endpoints_table, proto, tep); + transport_endpoint_del (tepi); + } +} + +/** + * Allocate local port and add if successful add entry to local endpoint + * table to mark the pair as used. + */ +int +transport_alloc_local_port (u8 proto, ip46_address_t * ip) +{ + transport_endpoint_t *tep; + u32 tei; + u16 min = 1024, max = 65535; /* XXX configurable ? */ + int tries, limit; + + limit = max - min; + + /* Only support active opens from thread 0 */ + ASSERT (vlib_get_thread_index () == 0); + + /* Search for first free slot */ + for (tries = 0; tries < limit; tries++) + { + u16 port = 0; + + /* Find a port in the specified range */ + while (1) + { + port = random_u32 (&port_allocator_seed) & PORT_MASK; + if (PREDICT_TRUE (port >= min && port < max)) + break; + } + + /* Look it up. If not found, we're done */ + tei = transport_endpoint_lookup (&local_endpoints_table, proto, ip, + port); + if (tei == ENDPOINT_INVALID_INDEX) + { + clib_spinlock_lock_if_init (&local_endpoints_lock); + tep = transport_endpoint_new (); + clib_memcpy (&tep->ip, ip, sizeof (*ip)); + tep->port = port; + transport_endpoint_table_add (&local_endpoints_table, proto, tep, + tep - local_endpoints); + clib_spinlock_unlock_if_init (&local_endpoints_lock); + + return tep->port; + } + } + return -1; +} + +int +transport_alloc_local_endpoint (u8 proto, transport_endpoint_t * rmt, + ip46_address_t * lcl_addr, u16 * lcl_port) +{ + fib_prefix_t prefix; + fib_node_index_t fei; + u32 sw_if_index; + int port; + + /* + * Find the local address and allocate port + */ + + /* Find a FIB path to the destination */ + clib_memcpy (&prefix.fp_addr, &rmt->ip, sizeof (rmt->ip)); + prefix.fp_proto = rmt->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; + prefix.fp_len = rmt->is_ip4 ? 32 : 128; + + ASSERT (rmt->fib_index != ENDPOINT_INVALID_INDEX); + fei = fib_table_lookup (rmt->fib_index, &prefix); + + /* Couldn't find route to destination. Bail out. */ + if (fei == FIB_NODE_INDEX_INVALID) + { + clib_warning ("no route to destination"); + return -1; + } + + sw_if_index = rmt->sw_if_index; + if (sw_if_index == ENDPOINT_INVALID_INDEX) + sw_if_index = fib_entry_get_resolving_interface (fei); + + if (sw_if_index == ENDPOINT_INVALID_INDEX) + { + clib_warning ("no resolving interface for %U", format_ip46_address, + &rmt->ip, (rmt->is_ip4 == 0) + 1); + return -1; + } + + memset (lcl_addr, 0, sizeof (*lcl_addr)); + + if (rmt->is_ip4) + { + ip4_address_t *ip4; + ip4 = ip_interface_get_first_ip (sw_if_index, 1); + lcl_addr->ip4.as_u32 = ip4->as_u32; + } + else + { + ip6_address_t *ip6; + ip6 = ip_interface_get_first_ip (sw_if_index, 0); + if (ip6 == 0) + { + clib_warning ("no routable ip6 addresses on %U", + format_vnet_sw_if_index_name, vnet_get_main (), + sw_if_index); + return -1; + } + clib_memcpy (&lcl_addr->ip6, ip6, sizeof (*ip6)); + } + + /* Allocate source port */ + port = transport_alloc_local_port (proto, lcl_addr); + if (port < 1) + { + clib_warning ("Failed to allocate src port"); + return -1; + } + *lcl_port = port; + return 0; +} + +void +transport_init (void) +{ + vlib_thread_main_t *vtm = vlib_get_thread_main (); + u32 local_endpoints_table_buckets = 250000; + u32 local_endpoints_table_memory = 512 << 20; + u32 num_threads; + + /* Initialize [port-allocator] random number seed */ + port_allocator_seed = (u32) clib_cpu_time_now (); + + clib_bihash_init_24_8 (&local_endpoints_table, "local endpoints table", + local_endpoints_table_buckets, + local_endpoints_table_memory); + num_threads = 1 /* main thread */ + vtm->n_threads; + if (num_threads > 1) + clib_spinlock_init (&local_endpoints_lock); +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |