diff options
Diffstat (limited to 'src/vnet/l2tp/l2tp.c')
| -rw-r--r-- | src/vnet/l2tp/l2tp.c | 739 |
1 files changed, 739 insertions, 0 deletions
diff --git a/src/vnet/l2tp/l2tp.c b/src/vnet/l2tp/l2tp.c new file mode 100644 index 00000000000..a4531dab85c --- /dev/null +++ b/src/vnet/l2tp/l2tp.c @@ -0,0 +1,739 @@ +/* + * l2tp.c : L2TPv3 tunnel support + * + * Copyright (c) 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 <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/l2/l2_input.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/l2tp/l2tp.h> + +l2t_main_t l2t_main; + +/* packet trace format function */ +u8 * +format_l2t_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + l2t_trace_t *t = va_arg (*args, l2t_trace_t *); + + if (t->is_user_to_network) + s = format (s, "L2T: %U (client) -> %U (our) session %d", + format_ip6_address, &t->client_address, + format_ip6_address, &t->our_address, t->session_index); + else + s = format (s, "L2T: %U (our) -> %U (client) session %d)", + format_ip6_address, &t->our_address, + format_ip6_address, &t->client_address, t->session_index); + return s; +} + +u8 * +format_l2t_session (u8 * s, va_list * args) +{ + l2t_session_t *session = va_arg (*args, l2t_session_t *); + l2t_main_t *lm = &l2t_main; + u32 counter_index; + vlib_counter_t v; + + s = format (s, "[%d] %U (our) %U (client) %U (sw_if_index %d)\n", + session - lm->sessions, + format_ip6_address, &session->our_address, + format_ip6_address, &session->client_address, + format_vnet_sw_interface_name, lm->vnet_main, + vnet_get_sw_interface (lm->vnet_main, session->sw_if_index), + session->sw_if_index); + + s = format (s, " local cookies %016llx %016llx remote cookie %016llx\n", + clib_net_to_host_u64 (session->local_cookie[0]), + clib_net_to_host_u64 (session->local_cookie[1]), + clib_net_to_host_u64 (session->remote_cookie)); + + s = format (s, " local session-id %d remote session-id %d\n", + clib_net_to_host_u32 (session->local_session_id), + clib_net_to_host_u32 (session->remote_session_id)); + + s = format (s, " l2 specific sublayer %s\n", + session->l2_sublayer_present ? "preset" : "absent"); + + counter_index = + session_index_to_counter_index (session - lm->sessions, + SESSION_COUNTER_USER_TO_NETWORK); + + vlib_get_combined_counter (&lm->counter_main, counter_index, &v); + if (v.packets != 0) + s = format (s, " user-to-net: %llu pkts %llu bytes\n", + v.packets, v.bytes); + + vlib_get_combined_counter (&lm->counter_main, counter_index + 1, &v); + + if (v.packets != 0) + s = format (s, " net-to-user: %llu pkts %llu bytes\n", + v.packets, v.bytes); + return s; +} + +static clib_error_t * +show_l2tp_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + l2t_session_t *session; + l2t_main_t *lm = &l2t_main; + char *keystr = 0; + int verbose = 0; + + if (unformat (input, "verbose") || unformat (input, "v")) + verbose = 1; + + if (pool_elts (lm->sessions) == 0) + vlib_cli_output (vm, "No l2tp sessions..."); + else + vlib_cli_output (vm, "%u l2tp sessions...", pool_elts (lm->sessions)); + + if (verbose) + { + switch (lm->lookup_type) + { + case L2T_LOOKUP_SRC_ADDRESS: + keystr = "src address"; + break; + + case L2T_LOOKUP_DST_ADDRESS: + keystr = "dst address"; + break; + + case L2T_LOOKUP_SESSION_ID: + keystr = "session id"; + break; + + default: + keystr = "BOGUS!"; + break; + } + + vlib_cli_output (vm, "L2tp session lookup on %s", keystr); + + /* *INDENT-OFF* */ + pool_foreach (session, lm->sessions, + ({ + vlib_cli_output (vm, "%U", format_l2t_session, session); + })); + /* *INDENT-ON* */ + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_session_detail_command, static) = { + .path = "show l2tpv3", + .short_help = "show l2tpv3 [verbose]", + .function = show_l2tp_command_fn, +}; +/* *INDENT-ON* */ + +static clib_error_t * +test_counters_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + l2t_session_t *session; + l2t_main_t *lm = &l2t_main; + u32 session_index; + u32 counter_index; + u32 nincr = 0; + u32 cpu_index = os_get_cpu_number (); + + /* *INDENT-OFF* */ + pool_foreach (session, lm->sessions, + ({ + session_index = session - lm->sessions; + counter_index = + session_index_to_counter_index (session_index, + SESSION_COUNTER_USER_TO_NETWORK); + vlib_increment_combined_counter (&lm->counter_main, + cpu_index, + counter_index, + 1/*pkt*/, 1111 /*bytes*/); + vlib_increment_combined_counter (&lm->counter_main, + cpu_index, + counter_index+1, + 1/*pkt*/, 2222 /*bytes*/); + nincr++; + + })); + /* *INDENT-ON* */ + vlib_cli_output (vm, "Incremented %d active counters\n", nincr); + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (test_counters_command, static) = { + .path = "test counters", + .short_help = "increment all active counters", + .function = test_counters_command_fn, +}; +/* *INDENT-ON* */ + +static clib_error_t * +clear_counters_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + l2t_session_t *session; + l2t_main_t *lm = &l2t_main; + u32 session_index; + u32 counter_index; + u32 nincr = 0; + + /* *INDENT-OFF* */ + pool_foreach (session, lm->sessions, + ({ + session_index = session - lm->sessions; + counter_index = + session_index_to_counter_index (session_index, + SESSION_COUNTER_USER_TO_NETWORK); + vlib_zero_combined_counter (&lm->counter_main, counter_index); + vlib_zero_combined_counter (&lm->counter_main, counter_index+1); + nincr++; + })); + /* *INDENT-ON* */ + vlib_cli_output (vm, "Cleared %d active counters\n", nincr); + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (clear_counters_command, static) = { + .path = "clear counters", + .short_help = "clear all active counters", + .function = clear_counters_command_fn, +}; +/* *INDENT-ON* */ + +static u8 * +format_l2tpv3_name (u8 * s, va_list * args) +{ + l2t_main_t *lm = &l2t_main; + u32 i = va_arg (*args, u32); + u32 show_dev_instance = ~0; + + if (i < vec_len (lm->dev_inst_by_real)) + show_dev_instance = lm->dev_inst_by_real[i]; + + if (show_dev_instance != ~0) + i = show_dev_instance; + + return format (s, "l2tpv3_tunnel%d", i); +} + +static int +l2tpv3_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance) +{ + l2t_main_t *lm = &l2t_main; + + vec_validate_init_empty (lm->dev_inst_by_real, hi->dev_instance, ~0); + + lm->dev_inst_by_real[hi->dev_instance] = new_dev_instance; + + return 0; +} + +static uword +dummy_interface_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + clib_warning ("you shouldn't be here, leaking buffers..."); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VNET_DEVICE_CLASS (l2tpv3_device_class,static) = { + .name = "L2TPv3", + .format_device_name = format_l2tpv3_name, + .name_renumber = l2tpv3_name_renumber, + .tx_function = dummy_interface_tx, +}; +/* *INDENT-ON* */ + +static u8 * +format_l2tp_header_with_length (u8 * s, va_list * args) +{ + u32 dev_instance = va_arg (*args, u32); + s = format (s, "unimplemented dev %u", dev_instance); + return s; +} + +/* *INDENT-OFF* */ +VNET_HW_INTERFACE_CLASS (l2tpv3_hw_class) = { + .name = "L2TPV3", + .format_header = format_l2tp_header_with_length, + .build_rewrite = default_build_rewrite, + .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, +}; +/* *INDENT-ON* */ + +int +create_l2tpv3_ipv6_tunnel (l2t_main_t * lm, + ip6_address_t * client_address, + ip6_address_t * our_address, + u32 local_session_id, + u32 remote_session_id, + u64 local_cookie, + u64 remote_cookie, + int l2_sublayer_present, + u32 encap_fib_index, u32 * sw_if_index) +{ + l2t_session_t *s = 0; + vnet_main_t *vnm = lm->vnet_main; + vnet_hw_interface_t *hi; + uword *p = (uword *) ~ 0; + u32 hw_if_index; + l2tpv3_header_t l2tp_hdr; + ip6_address_t *dst_address_copy, *src_address_copy; + u32 counter_index; + + remote_session_id = clib_host_to_net_u32 (remote_session_id); + local_session_id = clib_host_to_net_u32 (local_session_id); + + switch (lm->lookup_type) + { + case L2T_LOOKUP_SRC_ADDRESS: + p = hash_get_mem (lm->session_by_src_address, client_address); + break; + + case L2T_LOOKUP_DST_ADDRESS: + p = hash_get_mem (lm->session_by_dst_address, our_address); + break; + + case L2T_LOOKUP_SESSION_ID: + p = hash_get (lm->session_by_session_id, local_session_id); + break; + + default: + ASSERT (0); + } + + /* adding a session: session must not already exist */ + if (p) + return VNET_API_ERROR_INVALID_VALUE; + + pool_get (lm->sessions, s); + memset (s, 0, sizeof (*s)); + clib_memcpy (&s->our_address, our_address, sizeof (s->our_address)); + clib_memcpy (&s->client_address, client_address, + sizeof (s->client_address)); + s->local_cookie[0] = clib_host_to_net_u64 (local_cookie); + s->remote_cookie = clib_host_to_net_u64 (remote_cookie); + s->local_session_id = local_session_id; + s->remote_session_id = remote_session_id; + s->l2_sublayer_present = l2_sublayer_present; + /* precompute l2tp header size */ + s->l2tp_hdr_size = l2_sublayer_present ? + sizeof (l2tpv3_header_t) : + sizeof (l2tpv3_header_t) - sizeof (l2tp_hdr.l2_specific_sublayer); + s->admin_up = 0; + s->encap_fib_index = encap_fib_index; + + /* Setup hash table entries */ + switch (lm->lookup_type) + { + case L2T_LOOKUP_SRC_ADDRESS: + src_address_copy = clib_mem_alloc (sizeof (*src_address_copy)); + clib_memcpy (src_address_copy, client_address, + sizeof (*src_address_copy)); + hash_set_mem (lm->session_by_src_address, src_address_copy, + s - lm->sessions); + break; + case L2T_LOOKUP_DST_ADDRESS: + dst_address_copy = clib_mem_alloc (sizeof (*dst_address_copy)); + clib_memcpy (dst_address_copy, our_address, sizeof (*dst_address_copy)); + hash_set_mem (lm->session_by_dst_address, dst_address_copy, + s - lm->sessions); + break; + case L2T_LOOKUP_SESSION_ID: + hash_set (lm->session_by_session_id, local_session_id, + s - lm->sessions); + break; + + default: + ASSERT (0); + } + + /* validate counters */ + counter_index = + session_index_to_counter_index (s - lm->sessions, + SESSION_COUNTER_USER_TO_NETWORK); + vlib_validate_combined_counter (&lm->counter_main, counter_index); + vlib_validate_combined_counter (&lm->counter_main, counter_index + 1); + + if (vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) > 0) + { + hw_if_index = lm->free_l2tpv3_tunnel_hw_if_indices + [vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) - 1]; + _vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) -= 1; + + hi = vnet_get_hw_interface (vnm, hw_if_index); + hi->dev_instance = s - lm->sessions; + hi->hw_instance = hi->dev_instance; + } + else + { + hw_if_index = vnet_register_interface + (vnm, l2tpv3_device_class.index, s - lm->sessions, + l2tpv3_hw_class.index, s - lm->sessions); + hi = vnet_get_hw_interface (vnm, hw_if_index); + hi->output_node_index = l2t_encap_node.index; + /* $$$$ initialize custom dispositions, if needed */ + } + + s->hw_if_index = hw_if_index; + s->sw_if_index = hi->sw_if_index; + + if (sw_if_index) + *sw_if_index = hi->sw_if_index; + + return 0; +} + +static clib_error_t * +create_l2tpv3_tunnel_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + ip6_address_t client_address, our_address; + unformat_input_t _line_input, *line_input = &_line_input; + l2t_main_t *lm = &l2t_main; + u64 local_cookie = (u64) ~ 0, remote_cookie = (u64) ~ 0; + u32 local_session_id = 1, remote_session_id = 1; + int our_address_set = 0, client_address_set = 0; + int l2_sublayer_present = 0; + int rv; + u32 sw_if_index; + u32 encap_fib_id = ~0; + u32 encap_fib_index = ~0; + + /* Get a line of input. */ + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "client %U", + unformat_ip6_address, &client_address)) + client_address_set = 1; + else if (unformat (line_input, "our %U", + unformat_ip6_address, &our_address)) + our_address_set = 1; + else if (unformat (line_input, "local-cookie %llx", &local_cookie)) + ; + else if (unformat (line_input, "remote-cookie %llx", &remote_cookie)) + ; + else if (unformat (line_input, "local-session-id %d", + &local_session_id)) + ; + else if (unformat (line_input, "remote-session-id %d", + &remote_session_id)) + ; + else if (unformat (line_input, "fib-id %d", &encap_fib_id)) + ; + else if (unformat (line_input, "l2-sublayer-present")) + l2_sublayer_present = 1; + else + return clib_error_return (0, "parse error: '%U'", + format_unformat_error, line_input); + } + + unformat_free (line_input); + + if (encap_fib_id != ~0) + { + uword *p; + ip6_main_t *im = &ip6_main; + if (!(p = hash_get (im->fib_index_by_table_id, encap_fib_id))) + return clib_error_return (0, "No fib with id %d", encap_fib_id); + encap_fib_index = p[0]; + } + else + { + encap_fib_index = ~0; + } + + if (our_address_set == 0) + return clib_error_return (0, "our address not specified"); + if (client_address_set == 0) + return clib_error_return (0, "client address not specified"); + + rv = create_l2tpv3_ipv6_tunnel (lm, &client_address, &our_address, + local_session_id, remote_session_id, + local_cookie, remote_cookie, + l2_sublayer_present, + encap_fib_index, &sw_if_index); + switch (rv) + { + case 0: + vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, + vnet_get_main (), sw_if_index); + break; + case VNET_API_ERROR_INVALID_VALUE: + return clib_error_return (0, "session already exists..."); + + case VNET_API_ERROR_NO_SUCH_ENTRY: + return clib_error_return (0, "session does not exist..."); + + default: + return clib_error_return (0, "l2tp_session_add_del returned %d", rv); + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (create_l2tpv3_tunnel_command, static) = +{ + .path = "create l2tpv3 tunnel", + .short_help = + "create l2tpv3 tunnel client <ip6> our <ip6> local-cookie <hex> remote-cookie <hex> local-session <dec> remote-session <dec>", + .function = create_l2tpv3_tunnel_command_fn, +}; +/* *INDENT-ON* */ + +int +l2tpv3_set_tunnel_cookies (l2t_main_t * lm, + u32 sw_if_index, + u64 new_local_cookie, u64 new_remote_cookie) +{ + l2t_session_t *s; + vnet_hw_interface_t *hi; + vnet_main_t *vnm = vnet_get_main (); + hi = vnet_get_sup_hw_interface (vnm, sw_if_index); + + if (pool_is_free_index (lm->sessions, hi->dev_instance)) + return VNET_API_ERROR_INVALID_VALUE; + + s = pool_elt_at_index (lm->sessions, hi->dev_instance); + + s->local_cookie[1] = s->local_cookie[0]; + s->local_cookie[0] = clib_host_to_net_u64 (new_local_cookie); + s->remote_cookie = clib_host_to_net_u64 (new_remote_cookie); + + return 0; +} + + +static clib_error_t * +set_l2tp_tunnel_cookie_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + l2t_main_t *lm = &l2t_main; + vnet_main_t *vnm = vnet_get_main (); + u32 sw_if_index = ~0; + u64 local_cookie = (u64) ~ 0, remote_cookie = (u64) ~ 0; + + int rv; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, + &sw_if_index)) + ; + else if (unformat (input, "local %llx", &local_cookie)) + ; + else if (unformat (input, "remote %llx", &remote_cookie)) + ; + else + break; + } + if (sw_if_index == ~0) + return clib_error_return (0, "unknown interface"); + if (local_cookie == ~0) + return clib_error_return (0, "local cookie required"); + if (remote_cookie == ~0) + return clib_error_return (0, "remote cookie required"); + + rv = l2tpv3_set_tunnel_cookies (lm, sw_if_index, + local_cookie, remote_cookie); + + switch (rv) + { + case 0: + break; + + case VNET_API_ERROR_INVALID_SW_IF_INDEX: + return clib_error_return (0, "invalid interface"); + + default: + return clib_error_return (0, "l2tp_session_set_cookies returned %d", + rv); + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (set_l2tp_tunnel_cookie_command, static) = +{ + .path = "set l2tpv3 tunnel cookie", + .short_help = + "set l2tpv3 tunnel cookie <intfc> local <hex> remote <hex>", + .function = set_l2tp_tunnel_cookie_command_fn, +}; +/* *INDENT-ON* */ + +int +l2tpv3_interface_enable_disable (vnet_main_t * vnm, + u32 sw_if_index, int enable_disable) +{ + + if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index)) + return VNET_API_ERROR_INVALID_SW_IF_INDEX; + + vnet_feature_enable_disable ("ip6-unicast", "l2tp-decap", sw_if_index, + enable_disable, 0, 0); + return 0; +} + +/* Enable/disable L2TPv3 intercept on IP6 fowarding path */ +static clib_error_t * +set_ip6_l2tpv3 (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + u32 sw_if_index = ~0; + int is_add = 1; + int rv; + vnet_main_t *vnm = vnet_get_main (); + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, + &sw_if_index)) + ; + else if (unformat (input, "del")) + is_add = 0; + else + break; + } + + if (sw_if_index == ~0) + return clib_error_return (0, "interface required"); + + rv = l2tpv3_interface_enable_disable (vnm, sw_if_index, is_add); + + switch (rv) + { + case 0: + break; + + case VNET_API_ERROR_INVALID_SW_IF_INDEX: + return clib_error_return (0, "invalid interface"); + + default: + return clib_error_return (0, + "l2tp_interface_enable_disable returned %d", + rv); + } + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (set_interface_ip6_l2tpv3, static) = +{ + .path = "set interface ip6 l2tpv3", + .function = set_ip6_l2tpv3, + .short_help = "set interface ip6 l2tpv3 <intfc> [del]", +}; +/* *INDENT-ON* */ + +static clib_error_t * +l2tp_config (vlib_main_t * vm, unformat_input_t * input) +{ + l2t_main_t *lm = &l2t_main; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "lookup-v6-src")) + lm->lookup_type = L2T_LOOKUP_SRC_ADDRESS; + else if (unformat (input, "lookup-v6-dst")) + lm->lookup_type = L2T_LOOKUP_DST_ADDRESS; + else if (unformat (input, "lookup-session-id")) + lm->lookup_type = L2T_LOOKUP_SESSION_ID; + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, input); + } + return 0; +} + +VLIB_CONFIG_FUNCTION (l2tp_config, "l2tp"); + + +clib_error_t * +l2tp_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags) +{ + l2t_main_t *lm = &l2t_main; + vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index); + if (hi->hw_class_index != l2tpv3_hw_class.index) + return 0; + + u32 session_index = hi->dev_instance; + l2t_session_t *s = pool_elt_at_index (lm->sessions, session_index); + s->admin_up = ! !(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP); + return 0; +} + +VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (l2tp_sw_interface_up_down); + +clib_error_t * +l2tp_init (vlib_main_t * vm) +{ + l2t_main_t *lm = &l2t_main; + ip_main_t *im = &ip_main; + ip_protocol_info_t *pi; + + lm->vnet_main = vnet_get_main (); + lm->vlib_main = vm; + lm->lookup_type = L2T_LOOKUP_DST_ADDRESS; + + lm->session_by_src_address = hash_create_mem + (0, sizeof (ip6_address_t) /* key bytes */ , + sizeof (u32) /* value bytes */ ); + lm->session_by_dst_address = hash_create_mem + (0, sizeof (ip6_address_t) /* key bytes */ , + sizeof (u32) /* value bytes */ ); + lm->session_by_session_id = hash_create (0, sizeof (uword)); + + pi = ip_get_protocol_info (im, IP_PROTOCOL_L2TP); + pi->unformat_pg_edit = unformat_pg_l2tp_header; + + /* insure these nodes are included in build */ + l2tp_encap_init (vm); + l2tp_decap_init (); + + return 0; +} + +VLIB_INIT_FUNCTION (l2tp_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |