diff options
Diffstat (limited to 'plugins/snat-plugin/snat/snat.c')
| -rw-r--r-- | plugins/snat-plugin/snat/snat.c | 716 |
1 files changed, 716 insertions, 0 deletions
diff --git a/plugins/snat-plugin/snat/snat.c b/plugins/snat-plugin/snat/snat.c new file mode 100644 index 00000000000..3675602e917 --- /dev/null +++ b/plugins/snat-plugin/snat/snat.c @@ -0,0 +1,716 @@ +/* + * snat.c - simple nat plugin + * + * Copyright (c) 2016 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/vnet.h> +#include <vnet/plugin/plugin.h> +#include <vlibapi/api.h> +#include <snat/snat.h> + +#include <vlibapi/api.h> +#include <vlibmemory/api.h> +#include <vlibsocket/api.h> + +snat_main_t snat_main; + +/* define message IDs */ +#include <snat/snat_msg_enum.h> + +/* define message structures */ +#define vl_typedefs +#include <snat/snat_all_api_h.h> +#undef vl_typedefs + +/* define generated endian-swappers */ +#define vl_endianfun +#include <snat/snat_all_api_h.h> +#undef vl_endianfun + +#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__) + +/* Get the API version number */ +#define vl_api_version(n,v) static u32 api_version=(v); +#include <snat/snat_all_api_h.h> +#undef vl_api_version + +/* Macro to finish up custom dump fns */ +#define FINISH \ + vec_add1 (s, 0); \ + vl_print (handle, (char *)s); \ + vec_free (s); \ + return handle; + +/* + * A handy macro to set up a message reply. + * Assumes that the following variables are available: + * mp - pointer to request message + * rmp - pointer to reply message type + * rv - return value + */ + +#define REPLY_MACRO(t) \ +do { \ + unix_shared_memory_queue_t * q = \ + vl_api_client_index_to_input_queue (mp->client_index); \ + if (!q) \ + return; \ + \ + rmp = vl_msg_api_alloc (sizeof (*rmp)); \ + rmp->_vl_msg_id = ntohs((t)+sm->msg_id_base); \ + rmp->context = mp->context; \ + rmp->retval = ntohl(rv); \ + \ + vl_msg_api_send_shmem (q, (u8 *)&rmp); \ +} while(0); + + +/* Hook up input features */ +VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_in2out, static) = { + .node_name = "snat-in2out", + .runs_before = {"snat-out2in", 0}, + .feature_index = &snat_main.rx_feature_in2out, +}; +VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_out2in, static) = { + .node_name = "snat-out2in", + .runs_before = {"ip4-lookup", 0}, + .feature_index = &snat_main.rx_feature_out2in, +}; + +/* + * This routine exists to convince the vlib plugin framework that + * we haven't accidentally copied a random .dll into the plugin directory. + * + * Also collects global variable pointers passed from the vpp engine + */ + +clib_error_t * +vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h, + int from_early_init) +{ + snat_main_t * sm = &snat_main; + clib_error_t * error = 0; + + sm->vlib_main = vm; + sm->vnet_main = h->vnet_main; + sm->ethernet_main = h->ethernet_main; + + return error; +} + +/*$$$$$ move to an installed header file */ +#if (1 || CLIB_DEBUG > 0) /* "trust, but verify" */ + +#define VALIDATE_SW_IF_INDEX(mp) \ + do { u32 __sw_if_index = ntohl(mp->sw_if_index); \ + vnet_main_t *__vnm = vnet_get_main(); \ + if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \ + __sw_if_index)) { \ + rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \ + goto bad_sw_if_index; \ + } \ +} while(0); + +#define BAD_SW_IF_INDEX_LABEL \ +do { \ +bad_sw_if_index: \ + ; \ +} while (0); + +#define VALIDATE_RX_SW_IF_INDEX(mp) \ + do { u32 __rx_sw_if_index = ntohl(mp->rx_sw_if_index); \ + vnet_main_t *__vnm = vnet_get_main(); \ + if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \ + __rx_sw_if_index)) { \ + rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \ + goto bad_rx_sw_if_index; \ + } \ +} while(0); + +#define BAD_RX_SW_IF_INDEX_LABEL \ +do { \ +bad_rx_sw_if_index: \ + ; \ +} while (0); + +#define VALIDATE_TX_SW_IF_INDEX(mp) \ + do { u32 __tx_sw_if_index = ntohl(mp->tx_sw_if_index); \ + vnet_main_t *__vnm = vnet_get_main(); \ + if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \ + __tx_sw_if_index)) { \ + rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; \ + goto bad_tx_sw_if_index; \ + } \ +} while(0); + +#define BAD_TX_SW_IF_INDEX_LABEL \ +do { \ +bad_tx_sw_if_index: \ + ; \ +} while (0); + +#else + +#define VALIDATE_SW_IF_INDEX(mp) +#define BAD_SW_IF_INDEX_LABEL +#define VALIDATE_RX_SW_IF_INDEX(mp) +#define BAD_RX_SW_IF_INDEX_LABEL +#define VALIDATE_TX_SW_IF_INDEX(mp) +#define BAD_TX_SW_IF_INDEX_LABEL + +#endif /* CLIB_DEBUG > 0 */ + +void snat_add_address (snat_main_t *sm, ip4_address_t *addr) +{ + snat_address_t * ap; + + vec_add2 (sm->addresses, ap, 1); + ap->addr = *addr; + +} + +static void increment_v4_address (ip4_address_t * a) +{ + u32 v; + + v = clib_net_to_host_u32(a->as_u32) + 1; + a->as_u32 = clib_host_to_net_u32(v); +} + +static void +vl_api_snat_add_address_range_t_handler +(vl_api_snat_add_address_range_t * mp) +{ + snat_main_t * sm = &snat_main; + vl_api_snat_add_address_range_reply_t * rmp; + ip4_address_t this_addr; + u32 start_host_order, end_host_order; + int i, count; + int rv = 0; + u32 * tmp; + + if (mp->is_ip4 != 1) + { + rv = VNET_API_ERROR_UNIMPLEMENTED; + goto send_reply; + } + + tmp = (u32 *) mp->first_ip_address; + start_host_order = clib_host_to_net_u32 (tmp[0]); + tmp = (u32 *) mp->last_ip_address; + end_host_order = clib_host_to_net_u32 (tmp[0]); + + count = (end_host_order - start_host_order) + 1; + + if (count > 1024) + clib_warning ("%U - %U, %d addresses...", + format_ip4_address, mp->first_ip_address, + format_ip4_address, mp->last_ip_address, + count); + + memcpy (&this_addr.as_u8, mp->first_ip_address, 4); + + for (i = 0; i < count; i++) + { + snat_add_address (sm, &this_addr); + increment_v4_address (&this_addr); + } + + send_reply: + REPLY_MACRO (VL_API_SNAT_ADD_ADDRESS_RANGE_REPLY); +} + +static void *vl_api_snat_add_address_range_t_print +(vl_api_snat_add_address_range_t *mp, void * handle) +{ + u8 * s; + + s = format (0, "SCRIPT: snat_add_address_range "); + s = format (s, "%U ", format_ip4_address, mp->first_ip_address); + if (memcmp (mp->first_ip_address, mp->last_ip_address, 4)) + { + s = format (s, " - %U ", format_ip4_address, mp->last_ip_address); + } + FINISH; +} + +static void +vl_api_snat_interface_add_del_feature_t_handler +(vl_api_snat_interface_add_del_feature_t * mp) +{ + snat_main_t * sm = &snat_main; + vl_api_snat_interface_add_del_feature_reply_t * rmp; + u8 is_del = mp->is_add == 0; + u32 sw_if_index = ntohl(mp->sw_if_index); + u32 ci; + ip4_main_t * im = &ip4_main; + ip_lookup_main_t * lm = &im->lookup_main; + ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST]; + u32 feature_index; + int rv = 0; + + VALIDATE_SW_IF_INDEX(mp); + + feature_index = mp->is_inside ? sm->rx_feature_in2out + : sm->rx_feature_out2in; + + ci = rx_cm->config_index_by_sw_if_index[sw_if_index]; + ci = (is_del + ? vnet_config_del_feature + : vnet_config_add_feature) + (sm->vlib_main, &rx_cm->config_main, + ci, + feature_index, + 0 /* config struct */, + 0 /* sizeof config struct*/); + rx_cm->config_index_by_sw_if_index[sw_if_index] = ci; + + BAD_SW_IF_INDEX_LABEL; + + REPLY_MACRO(VL_API_SNAT_INTERFACE_ADD_DEL_FEATURE_REPLY); +} + +static void *vl_api_snat_interface_add_del_feature_t_print +(vl_api_snat_interface_add_del_feature_t * mp, void *handle) +{ + u8 * s; + + s = format (0, "SCRIPT: snat_interface_add_del_feature "); + s = format (s, "sw_if_index %d %s %s", + clib_host_to_net_u32(mp->sw_if_index), + mp->is_inside ? "in":"out", + mp->is_add ? "" : "del"); + + FINISH; +} + +/* List of message types that this plugin understands */ +#define foreach_snat_plugin_api_msg \ +_(SNAT_ADD_ADDRESS_RANGE, snat_add_address_range) \ +_(SNAT_INTERFACE_ADD_DEL_FEATURE, snat_interface_add_del_feature) + +/* Set up the API message handling tables */ +static clib_error_t * +snat_plugin_api_hookup (vlib_main_t *vm) +{ + snat_main_t * sm __attribute__ ((unused)) = &snat_main; +#define _(N,n) \ + vl_msg_api_set_handlers((VL_API_##N + sm->msg_id_base), \ + #n, \ + vl_api_##n##_t_handler, \ + vl_noop_handler, \ + vl_api_##n##_t_endian, \ + vl_api_##n##_t_print, \ + sizeof(vl_api_##n##_t), 1); + foreach_snat_plugin_api_msg; +#undef _ + + return 0; +} + +static void plugin_custom_dump_configure (snat_main_t * sm) +{ +#define _(n,f) sm->api_main->msg_print_handlers \ + [VL_API_##n + sm->msg_id_base] \ + = (void *) vl_api_##f##_t_print; + foreach_snat_plugin_api_msg; +#undef _ +} + +static clib_error_t * snat_init (vlib_main_t * vm) +{ + snat_main_t * sm = &snat_main; + clib_error_t * error = 0; + ip4_main_t * im = &ip4_main; + ip_lookup_main_t * lm = &im->lookup_main; + u8 * name; + + name = format (0, "snat_%08x%c", api_version, 0); + + /* Ask for a correctly-sized block of API message decode slots */ + sm->msg_id_base = vl_msg_api_get_msg_ids + ((char *) name, VL_MSG_FIRST_AVAILABLE); + + sm->vlib_main = vm; + sm->vnet_main = vnet_get_main(); + sm->ip4_main = im; + sm->ip4_lookup_main = lm; + sm->api_main = &api_main; + + error = snat_plugin_api_hookup (vm); + plugin_custom_dump_configure (sm); + vec_free(name); + + return error; +} + +VLIB_INIT_FUNCTION (snat_init); + +void snat_free_outside_address_and_port (snat_main_t * sm, + snat_session_key_t * k, + u32 address_index) +{ + snat_address_t *a; + u16 port_host_byte_order = clib_net_to_host_u16 (k->port); + + ASSERT (address_index < vec_len (sm->addresses)); + + a = sm->addresses + address_index; + + ASSERT (clib_bitmap_get (a->busy_port_bitmap, port_host_byte_order) == 1); + + a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap, + port_host_byte_order, 0); + a->busy_ports--; +} + +int snat_alloc_outside_address_and_port (snat_main_t * sm, + snat_session_key_t * k, + u32 * address_indexp) +{ + int i; + snat_address_t *a; + u32 portnum; + + for (i = 0; i < vec_len (sm->addresses); i++) + { + if (sm->addresses[i].busy_ports < (65535-1024)) + { + a = sm->addresses + i; + + while (1) + { + portnum = random_u32 (&sm->random_seed); + portnum &= 0xFFFF; + if (portnum < 1024) + continue; + if (clib_bitmap_get (a->busy_port_bitmap, portnum)) + continue; + a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap, + portnum, 1); + a->busy_ports++; + /* Caller sets protocol and fib index */ + k->addr = a->addr; + k->port = clib_host_to_net_u16(portnum); + *address_indexp = i; + return 0; + } + } + } + /* Totally out of translations to use... */ + return 1; +} + + +static clib_error_t * +add_address_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + snat_main_t * sm = &snat_main; + ip4_address_t start_addr, end_addr, this_addr; + u32 start_host_order, end_host_order; + int i, count; + + if (unformat (input, "%U - %U", + unformat_ip4_address, &start_addr, + unformat_ip4_address, &end_addr)) + ; + else if (unformat (input, "%U", unformat_ip4_address, &start_addr)) + end_addr = start_addr; + + start_host_order = clib_host_to_net_u32 (start_addr.as_u32); + end_host_order = clib_host_to_net_u32 (end_addr.as_u32); + + if (end_host_order < start_host_order) + return clib_error_return (0, "end address less than start address"); + + count = (end_host_order - start_host_order) + 1; + + if (count > 1024) + clib_warning ("%U - %U, %d addresses...", + format_ip4_address, &start_addr, + format_ip4_address, &end_addr, + count); + + this_addr = start_addr; + + for (i = 0; i < count; i++) + { + snat_add_address (sm, &this_addr); + increment_v4_address (&this_addr); + } + + return 0; +} + +VLIB_CLI_COMMAND (add_address_command, static) = { + .path = "snat add address", + .short_help = "snat add addresses <ip4-range-start> [- <ip4-range-end>]", + .function = add_address_command_fn, +}; + +static clib_error_t * +snat_feature_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + vnet_main_t * vnm = vnet_get_main(); + snat_main_t * sm = &snat_main; + ip4_main_t * im = &ip4_main; + ip_lookup_main_t * lm = &im->lookup_main; + ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST]; + clib_error_t * error = 0; + u32 sw_if_index, ci; + u32 feature_index; + u32 * inside_sw_if_indices = 0; + u32 * outside_sw_if_indices = 0; + int is_del = 0; + int i; + + sw_if_index = ~0; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "in %U", unformat_vnet_sw_interface, + vnm, &sw_if_index)) + vec_add1 (inside_sw_if_indices, sw_if_index); + else if (unformat (input, "out %U", unformat_vnet_sw_interface, + vnm, &sw_if_index)) + vec_add1 (outside_sw_if_indices, sw_if_index); + else if (unformat (input, "del")) + is_del = 1; + else + break; + } + + if (vec_len (inside_sw_if_indices)) + { + feature_index = sm->rx_feature_in2out; + + for (i = 0; i < vec_len(inside_sw_if_indices); i++) + { + sw_if_index = inside_sw_if_indices[i]; + ci = rx_cm->config_index_by_sw_if_index[sw_if_index]; + ci = (is_del + ? vnet_config_del_feature + : vnet_config_add_feature) + (vm, &rx_cm->config_main, + ci, + feature_index, + 0 /* config struct */, + 0 /* sizeof config struct*/); + rx_cm->config_index_by_sw_if_index[sw_if_index] = ci; + } + } + + if (vec_len (outside_sw_if_indices)) + { + feature_index = sm->rx_feature_out2in; + + for (i = 0; i < vec_len(outside_sw_if_indices); i++) + { + sw_if_index = outside_sw_if_indices[i]; + ci = rx_cm->config_index_by_sw_if_index[sw_if_index]; + ci = (is_del + ? vnet_config_del_feature + : vnet_config_add_feature) + (vm, &rx_cm->config_main, + ci, + feature_index, + 0 /* config struct */, + 0 /* sizeof config struct*/); + rx_cm->config_index_by_sw_if_index[sw_if_index] = ci; + } + } + + vec_free (inside_sw_if_indices); + vec_free (outside_sw_if_indices); + + return error; +} + +VLIB_CLI_COMMAND (set_interface_snat_command, static) = { + .path = "set interface snat", + .function = snat_feature_command_fn, + .short_help = "set interface snat in <intfc> out <intfc> [del]", +}; + +static clib_error_t * +snat_config (vlib_main_t * vm, unformat_input_t * input) +{ + snat_main_t * sm = &snat_main; + u32 translation_buckets = 1024; + u32 translation_memory_size = 128<<20; + u32 user_buckets = 128; + u32 user_memory_size = 64<<20; + u32 max_translations_per_user = 100; + u32 outside_vrf_id = 0; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "translation hash buckets %d", &translation_buckets)) + ; + else if (unformat (input, "translation hash memory %d", + &translation_memory_size)); + else if (unformat (input, "user hash buckets %d", &user_buckets)) + ; + else if (unformat (input, "user hash memory %d", + &user_memory_size)) + ; + else if (unformat (input, "max translations per user %d", + &max_translations_per_user)) + ; + else if (unformat (input, "outside VRF id %d", + &outside_vrf_id)) + ; + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, input); + } + + /* for show commands, etc. */ + sm->translation_buckets = translation_buckets; + sm->translation_memory_size = translation_memory_size; + sm->user_buckets = user_buckets; + sm->user_memory_size = user_memory_size; + sm->max_translations_per_user = max_translations_per_user; + sm->outside_vrf_id = outside_vrf_id; + + clib_bihash_init_8_8 (&sm->in2out, "in2out", translation_buckets, + translation_memory_size); + + clib_bihash_init_8_8 (&sm->out2in, "out2in", translation_buckets, + translation_memory_size); + + clib_bihash_init_8_8 (&sm->user_hash, "users", user_buckets, + user_memory_size); + return 0; +} + +VLIB_CONFIG_FUNCTION (snat_config, "snat"); + +u8 * format_snat_key (u8 * s, va_list * args) +{ + snat_session_key_t * key = va_arg (*args, snat_session_key_t *); + char * protocol_string = "unknown"; + static char *protocol_strings[] = { + "UDP", + "TCP", + "ICMP", + }; + + if (key->protocol < ARRAY_LEN(protocol_strings)) + protocol_string = protocol_strings[key->protocol]; + + s = format (s, "%U proto %s port %d fib %d", + format_ip4_address, &key->addr, protocol_string, + key->port, key->fib_index); + return s; +} + +u8 * format_snat_session (u8 * s, va_list * args) +{ + snat_main_t * sm __attribute__((unused)) = va_arg (*args, snat_main_t *); + snat_session_t * sess = va_arg (*args, snat_session_t *); + + s = format (s, " i2o %U\n", format_snat_key, &sess->in2out); + s = format (s, " o2i %U\n", format_snat_key, &sess->out2in); + s = format (s, " last heard %.2f\n", sess->last_heard); + s = format (s, " total pkts %d, total bytes %lld\n", + sess->total_pkts, sess->total_bytes); + + return s; +} + +u8 * format_snat_user (u8 * s, va_list * args) +{ + snat_main_t * sm = va_arg (*args, snat_main_t *); + snat_user_t * u = va_arg (*args, snat_user_t *); + int verbose = va_arg (*args, int); + dlist_elt_t * head, * elt; + u32 elt_index, head_index; + u32 session_index; + snat_session_t * sess; + + s = format (s, "%U: %d translations\n", + format_ip4_address, &u->addr, u->nsessions); + + if (verbose == 0) + return s; + + head_index = u->sessions_per_user_list_head_index; + head = pool_elt_at_index (sm->list_pool, head_index); + + elt_index = head->next; + elt = pool_elt_at_index (sm->list_pool, elt_index); + session_index = elt->value; + + while (session_index != ~0) + { + sess = pool_elt_at_index (sm->sessions, session_index); + + s = format (s, " %U\n", format_snat_session, sm, sess); + + elt_index = elt->next; + elt = pool_elt_at_index (sm->list_pool, elt_index); + session_index = elt->value; + } + + return s; +} + +static clib_error_t * +show_snat_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + int verbose = 0; + snat_main_t * sm = &snat_main; + snat_user_t * u; + + if (unformat (input, "detail")) + verbose = 1; + else if (unformat (input, "verbose")) + verbose = 2; + + vlib_cli_output (vm, "%d users, %d outside addresses, %d active sessions", + pool_elts (sm->users), + vec_len (sm->addresses), + pool_elts (sm->sessions)); + + if (verbose > 0) + { + vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->in2out, + verbose - 1); + vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->out2in, + verbose - 1); + vlib_cli_output (vm, "%d list pool elements", + pool_elts (sm->list_pool)); + + pool_foreach (u, sm->users, + ({ + vlib_cli_output (vm, "%U", format_snat_user, sm, u, verbose - 1); + })); + } + + return 0; +} + +VLIB_CLI_COMMAND (show_snat_command, static) = { + .path = "show snat", + .short_help = "show snat", + .function = show_snat_command_fn, +}; |