diff options
Diffstat (limited to 'vpp/vnet/vnet/ip/lookup.c')
| -rw-r--r-- | vpp/vnet/vnet/ip/lookup.c | 967 |
1 files changed, 967 insertions, 0 deletions
diff --git a/vpp/vnet/vnet/ip/lookup.c b/vpp/vnet/vnet/ip/lookup.c new file mode 100644 index 00000000..734a4cd7 --- /dev/null +++ b/vpp/vnet/vnet/ip/lookup.c @@ -0,0 +1,967 @@ +/* + * Copyright (c) 2015 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. + */ +/* + * ip/ip_lookup.c: ip4/6 adjacency and lookup table managment + * + * Copyright (c) 2008 Eliot Dresselhaus + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <vnet/ip/ip.h> +#include <vnet/adj/adj.h> +#include <vnet/fib/fib_table.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/fib/ip6_fib.h> +#include <vnet/mpls/mpls.h> +#include <vnet/dpo/drop_dpo.h> +#include <vnet/dpo/classify_dpo.h> +#include <vnet/dpo/punt_dpo.h> +#include <vnet/dpo/receive_dpo.h> +#include <vnet/dpo/ip_null_dpo.h> + +/** + * @file + * @brief IPv4 and IPv6 adjacency and lookup table managment. + * + */ + +clib_error_t * +ip_interface_address_add_del (ip_lookup_main_t * lm, + u32 sw_if_index, + void *addr_fib, + u32 address_length, + u32 is_del, u32 * result_if_address_index) +{ + vnet_main_t *vnm = vnet_get_main (); + ip_interface_address_t *a, *prev, *next; + uword *p = mhash_get (&lm->address_to_if_address_index, addr_fib); + + vec_validate_init_empty (lm->if_address_pool_index_by_sw_if_index, + sw_if_index, ~0); + a = p ? pool_elt_at_index (lm->if_address_pool, p[0]) : 0; + + /* Verify given length. */ + if ((a && (address_length != a->address_length)) || (address_length == 0)) + { + vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH; + return clib_error_create + ("%U wrong length (expected %d) for interface %U", + lm->format_address_and_length, addr_fib, + address_length, a ? a->address_length : -1, + format_vnet_sw_if_index_name, vnm, sw_if_index); + } + + if (is_del) + { + if (!a) + { + vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index); + vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE; + return clib_error_create ("%U not found for interface %U", + lm->format_address_and_length, + addr_fib, address_length, + format_vnet_sw_interface_name, vnm, si); + } + + if (a->prev_this_sw_interface != ~0) + { + prev = + pool_elt_at_index (lm->if_address_pool, + a->prev_this_sw_interface); + prev->next_this_sw_interface = a->next_this_sw_interface; + } + if (a->next_this_sw_interface != ~0) + { + next = + pool_elt_at_index (lm->if_address_pool, + a->next_this_sw_interface); + next->prev_this_sw_interface = a->prev_this_sw_interface; + + if (a->prev_this_sw_interface == ~0) + lm->if_address_pool_index_by_sw_if_index[sw_if_index] = + a->next_this_sw_interface; + } + + if ((a->next_this_sw_interface == ~0) + && (a->prev_this_sw_interface == ~0)) + lm->if_address_pool_index_by_sw_if_index[sw_if_index] = ~0; + + mhash_unset (&lm->address_to_if_address_index, addr_fib, + /* old_value */ 0); + pool_put (lm->if_address_pool, a); + + if (result_if_address_index) + *result_if_address_index = ~0; + } + + else if (!a) + { + u32 pi; /* previous index */ + u32 ai; + u32 hi; /* head index */ + + pool_get (lm->if_address_pool, a); + memset (a, ~0, sizeof (a[0])); + ai = a - lm->if_address_pool; + + hi = pi = lm->if_address_pool_index_by_sw_if_index[sw_if_index]; + prev = 0; + while (pi != (u32) ~ 0) + { + prev = pool_elt_at_index (lm->if_address_pool, pi); + pi = prev->next_this_sw_interface; + } + pi = prev ? prev - lm->if_address_pool : (u32) ~ 0; + + a->address_key = mhash_set (&lm->address_to_if_address_index, + addr_fib, ai, /* old_value */ 0); + a->address_length = address_length; + a->sw_if_index = sw_if_index; + a->flags = 0; + a->prev_this_sw_interface = pi; + a->next_this_sw_interface = ~0; + if (prev) + prev->next_this_sw_interface = ai; + + lm->if_address_pool_index_by_sw_if_index[sw_if_index] = + (hi != ~0) ? hi : ai; + if (result_if_address_index) + *result_if_address_index = ai; + } + else + { + if (result_if_address_index) + *result_if_address_index = a - lm->if_address_pool; + } + + + return /* no error */ 0; +} + +void +ip_lookup_init (ip_lookup_main_t * lm, u32 is_ip6) +{ + /* ensure that adjacency is cacheline aligned and sized */ + STATIC_ASSERT (STRUCT_OFFSET_OF (ip_adjacency_t, cacheline0) == 0, + "Cache line marker must be 1st element in struct"); + STATIC_ASSERT (STRUCT_OFFSET_OF (ip_adjacency_t, cacheline1) == + CLIB_CACHE_LINE_BYTES, + "Data in cache line 0 is bigger than cache line size"); + + /* Preallocate three "special" adjacencies */ + lm->adjacency_heap = adj_pool; + + if (!lm->fib_result_n_bytes) + lm->fib_result_n_bytes = sizeof (uword); + + lm->is_ip6 = is_ip6; + if (is_ip6) + { + lm->format_address_and_length = format_ip6_address_and_length; + mhash_init (&lm->address_to_if_address_index, sizeof (uword), + sizeof (ip6_address_fib_t)); + } + else + { + lm->format_address_and_length = format_ip4_address_and_length; + mhash_init (&lm->address_to_if_address_index, sizeof (uword), + sizeof (ip4_address_fib_t)); + } + + { + int i; + + /* Setup all IP protocols to be punted and builtin-unknown. */ + for (i = 0; i < 256; i++) + { + lm->local_next_by_ip_protocol[i] = IP_LOCAL_NEXT_PUNT; + lm->builtin_protocol_by_ip_protocol[i] = IP_BUILTIN_PROTOCOL_UNKNOWN; + } + + lm->local_next_by_ip_protocol[IP_PROTOCOL_UDP] = IP_LOCAL_NEXT_UDP_LOOKUP; + lm->local_next_by_ip_protocol[is_ip6 ? IP_PROTOCOL_ICMP6 : + IP_PROTOCOL_ICMP] = IP_LOCAL_NEXT_ICMP; + lm->builtin_protocol_by_ip_protocol[IP_PROTOCOL_UDP] = + IP_BUILTIN_PROTOCOL_UDP; + lm->builtin_protocol_by_ip_protocol[is_ip6 ? IP_PROTOCOL_ICMP6 : + IP_PROTOCOL_ICMP] = + IP_BUILTIN_PROTOCOL_ICMP; + } +} + +u8 * +format_ip_flow_hash_config (u8 * s, va_list * args) +{ + flow_hash_config_t flow_hash_config = va_arg (*args, u32); + +#define _(n,v) if (flow_hash_config & v) s = format (s, "%s ", #n); + foreach_flow_hash_bit; +#undef _ + + return s; +} + +u8 * +format_ip_lookup_next (u8 * s, va_list * args) +{ + ip_lookup_next_t n = va_arg (*args, ip_lookup_next_t); + char *t = 0; + + switch (n) + { + default: + s = format (s, "unknown %d", n); + return s; + + case IP_LOOKUP_NEXT_DROP: + t = "drop"; + break; + case IP_LOOKUP_NEXT_PUNT: + t = "punt"; + break; + case IP_LOOKUP_NEXT_ARP: + t = "arp"; + break; + case IP_LOOKUP_NEXT_MIDCHAIN: + t = "midchain"; + break; + case IP_LOOKUP_NEXT_GLEAN: + t = "glean"; + break; + case IP_LOOKUP_NEXT_REWRITE: + break; + } + + if (t) + vec_add (s, t, strlen (t)); + + return s; +} + +u8 * +format_ip_adjacency_packet_data (u8 * s, va_list * args) +{ + vnet_main_t *vnm = va_arg (*args, vnet_main_t *); + u32 adj_index = va_arg (*args, u32); + u8 *packet_data = va_arg (*args, u8 *); + u32 n_packet_data_bytes = va_arg (*args, u32); + ip_adjacency_t *adj = adj_get (adj_index); + + switch (adj->lookup_next_index) + { + case IP_LOOKUP_NEXT_REWRITE: + s = format (s, "%U", + format_vnet_rewrite_header, + vnm->vlib_main, &adj->rewrite_header, packet_data, + n_packet_data_bytes); + break; + + default: + break; + } + + return s; +} + +static uword +unformat_dpo (unformat_input_t * input, va_list * args) +{ + dpo_id_t *dpo = va_arg (*args, dpo_id_t *); + fib_protocol_t fp = va_arg (*args, int); + dpo_proto_t proto; + + proto = fib_proto_to_dpo (fp); + + if (unformat (input, "drop")) + dpo_copy (dpo, drop_dpo_get (proto)); + else if (unformat (input, "punt")) + dpo_copy (dpo, punt_dpo_get (proto)); + else if (unformat (input, "local")) + receive_dpo_add_or_lock (proto, ~0, NULL, dpo); + else if (unformat (input, "null-send-unreach")) + ip_null_dpo_add_and_lock (proto, IP_NULL_ACTION_SEND_ICMP_UNREACH, dpo); + else if (unformat (input, "null-send-prohibit")) + ip_null_dpo_add_and_lock (proto, IP_NULL_ACTION_SEND_ICMP_PROHIBIT, dpo); + else if (unformat (input, "null")) + ip_null_dpo_add_and_lock (proto, IP_NULL_ACTION_NONE, dpo); + else if (unformat (input, "classify")) + { + u32 classify_table_index; + + if (!unformat (input, "%d", &classify_table_index)) + { + clib_warning ("classify adj must specify table index"); + return 0; + } + + dpo_set (dpo, DPO_CLASSIFY, proto, + classify_dpo_create (proto, classify_table_index)); + } + else + return 0; + + return 1; +} + +const ip46_address_t zero_addr = { + .as_u64 = { + 0, 0}, +}; + +u32 +fib_table_id_find_fib_index (fib_protocol_t proto, u32 table_id) +{ + ip4_main_t *im4 = &ip4_main; + ip6_main_t *im6 = &ip6_main; + uword *p; + + switch (proto) + { + case FIB_PROTOCOL_IP4: + p = hash_get (im4->fib_index_by_table_id, table_id); + break; + case FIB_PROTOCOL_IP6: + p = hash_get (im6->fib_index_by_table_id, table_id); + break; + default: + p = NULL; + break; + } + if (NULL != p) + { + return (p[0]); + } + return (~0); +} + +clib_error_t * +vnet_ip_route_cmd (vlib_main_t * vm, + unformat_input_t * main_input, vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + fib_route_path_t *rpaths = NULL, rpath; + dpo_id_t dpo = DPO_INVALID, *dpos = NULL; + fib_prefix_t *prefixs = NULL, pfx; + mpls_label_t out_label, via_label; + clib_error_t *error = NULL; + u32 table_id, is_del; + vnet_main_t *vnm; + u32 fib_index; + f64 count; + int i; + + vnm = vnet_get_main (); + is_del = 0; + table_id = 0; + count = 1; + memset (&pfx, 0, sizeof (pfx)); + out_label = via_label = MPLS_LABEL_INVALID; + + /* Get a line of input. */ + if (!unformat_user (main_input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + memset (&rpath, 0, sizeof (rpath)); + + if (unformat (line_input, "table %d", &table_id)) + ; + else if (unformat (line_input, "del")) + is_del = 1; + else if (unformat (line_input, "add")) + is_del = 0; + else if (unformat (line_input, "resolve-via-host")) + { + if (vec_len (rpaths) == 0) + { + error = clib_error_return (0, "Paths then flags"); + goto done; + } + rpaths[vec_len (rpaths) - 1].frp_flags |= + FIB_ROUTE_PATH_RESOLVE_VIA_HOST; + } + else if (unformat (line_input, "resolve-via-attached")) + { + if (vec_len (rpaths) == 0) + { + error = clib_error_return (0, "Paths then flags"); + goto done; + } + rpaths[vec_len (rpaths) - 1].frp_flags |= + FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED; + } + else if (unformat (line_input, "out-label %U", + unformat_mpls_unicast_label, &out_label)) + { + if (vec_len (rpaths) == 0) + { + error = clib_error_return (0, "Paths then labels"); + goto done; + } + vec_add1 (rpaths[vec_len (rpaths) - 1].frp_label_stack, out_label); + } + else if (unformat (line_input, "via-label %U", + unformat_mpls_unicast_label, &rpath.frp_local_label)) + { + rpath.frp_weight = 1; + rpath.frp_proto = FIB_PROTOCOL_MPLS; + rpath.frp_sw_if_index = ~0; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, "count %f", &count)) + ; + + else if (unformat (line_input, "%U/%d", + unformat_ip4_address, &pfx.fp_addr.ip4, &pfx.fp_len)) + { + pfx.fp_proto = FIB_PROTOCOL_IP4; + vec_add1 (prefixs, pfx); + } + else if (unformat (line_input, "%U/%d", + unformat_ip6_address, &pfx.fp_addr.ip6, &pfx.fp_len)) + { + pfx.fp_proto = FIB_PROTOCOL_IP6; + vec_add1 (prefixs, pfx); + } + else if (unformat (line_input, "via %U %U weight %u", + unformat_ip4_address, + &rpath.frp_addr.ip4, + unformat_vnet_sw_interface, vnm, + &rpath.frp_sw_if_index, &rpath.frp_weight)) + { + rpath.frp_proto = FIB_PROTOCOL_IP4; + vec_add1 (rpaths, rpath); + } + + else if (unformat (line_input, "via %U %U weight %u", + unformat_ip6_address, + &rpath.frp_addr.ip6, + unformat_vnet_sw_interface, vnm, + &rpath.frp_sw_if_index, &rpath.frp_weight)) + { + rpath.frp_proto = FIB_PROTOCOL_IP6; + vec_add1 (rpaths, rpath); + } + + else if (unformat (line_input, "via %U %U", + unformat_ip4_address, + &rpath.frp_addr.ip4, + unformat_vnet_sw_interface, vnm, + &rpath.frp_sw_if_index)) + { + rpath.frp_weight = 1; + rpath.frp_proto = FIB_PROTOCOL_IP4; + vec_add1 (rpaths, rpath); + } + + else if (unformat (line_input, "via %U %U", + unformat_ip6_address, + &rpath.frp_addr.ip6, + unformat_vnet_sw_interface, vnm, + &rpath.frp_sw_if_index)) + { + rpath.frp_weight = 1; + rpath.frp_proto = FIB_PROTOCOL_IP6; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, "via %U next-hop-table %d", + unformat_ip4_address, + &rpath.frp_addr.ip4, &rpath.frp_fib_index)) + { + rpath.frp_weight = 1; + rpath.frp_sw_if_index = ~0; + rpath.frp_proto = FIB_PROTOCOL_IP4; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, "via %U next-hop-table %d", + unformat_ip6_address, + &rpath.frp_addr.ip6, &rpath.frp_fib_index)) + { + rpath.frp_weight = 1; + rpath.frp_sw_if_index = ~0; + rpath.frp_proto = FIB_PROTOCOL_IP6; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, "via %U", + unformat_ip4_address, &rpath.frp_addr.ip4)) + { + /* + * the recursive next-hops are by default in the same table + * as the prefix + */ + rpath.frp_fib_index = table_id; + rpath.frp_weight = 1; + rpath.frp_sw_if_index = ~0; + rpath.frp_proto = FIB_PROTOCOL_IP4; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, "via %U", + unformat_ip6_address, &rpath.frp_addr.ip6)) + { + rpath.frp_fib_index = table_id; + rpath.frp_weight = 1; + rpath.frp_sw_if_index = ~0; + rpath.frp_proto = FIB_PROTOCOL_IP6; + vec_add1 (rpaths, rpath); + } + else if (unformat (line_input, + "lookup in table %d", &rpath.frp_fib_index)) + { + rpath.frp_proto = pfx.fp_proto; + rpath.frp_sw_if_index = ~0; + vec_add1 (rpaths, rpath); + } + else if (vec_len (prefixs) > 0 && + unformat (line_input, "via %U", + unformat_vnet_sw_interface, vnm, + &rpath.frp_sw_if_index)) + { + rpath.frp_weight = 1; + rpath.frp_proto = prefixs[0].fp_proto; + vec_add1 (rpaths, rpath); + } + else if (vec_len (prefixs) > 0 && + unformat (line_input, "via %U", + unformat_dpo, &dpo, prefixs[0].fp_proto)) + { + vec_add1 (dpos, dpo); + } + else + { + error = unformat_parse_error (line_input); + goto done; + } + } + + unformat_free (line_input); + + if (vec_len (prefixs) == 0) + { + error = + clib_error_return (0, "expected ip4/ip6 destination address/length."); + goto done; + } + + if (!is_del && vec_len (rpaths) + vec_len (dpos) == 0) + { + error = clib_error_return (0, "expected paths."); + goto done; + } + + if (~0 == table_id) + { + /* + * if no table_id is passed we will manipulate the default + */ + fib_index = 0; + } + else + { + fib_index = fib_table_id_find_fib_index (prefixs[0].fp_proto, table_id); + + if (~0 == fib_index) + { + error = clib_error_return (0, "Nonexistent table id %d", table_id); + goto done; + } + } + + for (i = 0; i < vec_len (prefixs); i++) + { + if (is_del && 0 == vec_len (rpaths)) + { + fib_table_entry_delete (fib_index, &prefixs[i], FIB_SOURCE_CLI); + } + else if (!is_del && 1 == vec_len (dpos)) + { + fib_table_entry_special_dpo_add (fib_index, + &prefixs[i], + FIB_SOURCE_CLI, + FIB_ENTRY_FLAG_EXCLUSIVE, + &dpos[0]); + dpo_reset (&dpos[0]); + } + else if (vec_len (dpos) > 0) + { + error = + clib_error_return (0, + "Load-balancing over multiple special adjacencies is unsupported"); + goto done; + } + else if (0 < vec_len (rpaths)) + { + u32 k, j, n, incr; + ip46_address_t dst = prefixs[i].fp_addr; + f64 t[2]; + n = count; + t[0] = vlib_time_now (vm); + incr = 1 << ((FIB_PROTOCOL_IP4 == prefixs[0].fp_proto ? 32 : 128) - + prefixs[i].fp_len); + + for (k = 0; k < n; k++) + { + for (j = 0; j < vec_len (rpaths); j++) + { + u32 fi; + /* + * the CLI parsing stored table Ids, swap to FIB indicies + */ + fi = fib_table_id_find_fib_index (prefixs[i].fp_proto, + rpaths[i].frp_fib_index); + + if (~0 == fi) + { + error = + clib_error_return (0, "Via table %d does not exist", + rpaths[i].frp_fib_index); + goto done; + } + rpaths[i].frp_fib_index = fi; + + fib_prefix_t rpfx = { + .fp_len = prefixs[i].fp_len, + .fp_proto = prefixs[i].fp_proto, + .fp_addr = dst, + }; + + if (is_del) + fib_table_entry_path_remove2 (fib_index, + &rpfx, + FIB_SOURCE_CLI, &rpaths[j]); + else + fib_table_entry_path_add2 (fib_index, + &rpfx, + FIB_SOURCE_CLI, + FIB_ENTRY_FLAG_NONE, + &rpaths[j]); + } + + if (FIB_PROTOCOL_IP4 == prefixs[0].fp_proto) + { + dst.ip4.as_u32 = + clib_host_to_net_u32 (incr + + clib_net_to_host_u32 (dst. + ip4.as_u32)); + } + else + { + int bucket = (incr < 64 ? 0 : 1); + dst.ip6.as_u64[bucket] = + clib_host_to_net_u64 (incr + + clib_net_to_host_u64 (dst.ip6.as_u64 + [bucket])); + + } + } + t[1] = vlib_time_now (vm); + if (count > 1) + vlib_cli_output (vm, "%.6e routes/sec", count / (t[1] - t[0])); + } + else + { + error = clib_error_return (0, "Don't understand what you want..."); + goto done; + } + } + + +done: + vec_free (dpos); + vec_free (prefixs); + vec_free (rpaths); + return error; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (vlib_cli_ip_command, static) = { + .path = "ip", + .short_help = "Internet protocol (IP) commands", +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (vlib_cli_ip6_command, static) = { + .path = "ip6", + .short_help = "Internet protocol version 6 (IPv6) commands", +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (vlib_cli_show_ip_command, static) = { + .path = "show ip", + .short_help = "Internet protocol (IP) show commands", +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (vlib_cli_show_ip6_command, static) = { + .path = "show ip6", + .short_help = "Internet protocol version 6 (IPv6) show commands", +}; +/* *INDENT-ON* */ + +/*? + * This command is used to add or delete IPv4 or IPv6 routes. All + * IP Addresses ('<em><dst-ip-addr>/<width></em>', + * '<em><next-hop-ip-addr></em>' and '<em><adj-hop-ip-addr></em>') + * can be IPv4 or IPv6, but all must be of the same form in a single + * command. To display the current set of routes, use the commands + * '<em>show ip fib</em>' and '<em>show ip6 fib</em>'. + * + * @cliexpar + * Example of how to add a straight forward static route: + * @cliexcmd{ip route add 6.0.1.2/32 via 6.0.0.1 GigabitEthernet2/0/0} + * Example of how to delete a straight forward static route: + * @cliexcmd{ip route del 6.0.1.2/32 via 6.0.0.1 GigabitEthernet2/0/0} + * Mainly for route add/del performance testing, one can add or delete + * multiple routes by adding 'count N' to the previous item: + * @cliexcmd{ip route add count 10 7.0.0.0/24 via 6.0.0.1 GigabitEthernet2/0/0} + * Add multiple routes for the same destination to create equal-cost multipath: + * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.1 GigabitEthernet2/0/0} + * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.2 GigabitEthernet2/0/0} + * For unequal-cost multipath, specify the desired weights. This + * combination of weights results in 3/4 of the traffic following the + * second path, 1/4 following the first path: + * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.1 GigabitEthernet2/0/0 weight 1} + * @cliexcmd{ip route add 7.0.0.1/32 via 6.0.0.2 GigabitEthernet2/0/0 weight 3} + * To add a route to a particular FIB table (VRF), use: + * @cliexcmd{ip route add 172.16.24.0/24 table 7 via GigabitEthernet2/0/0} + ?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (ip_route_command, static) = { + .path = "ip route", + .short_help = "ip route [add|del] [count <n>] <dst-ip-addr>/<width> [table <table-id>] [via <next-hop-ip-addr> [<interface>] [weight <weight>]] | [via arp <interface> <adj-hop-ip-addr>] | [via drop|punt|local<id>|arp|classify <classify-idx>] [lookup in table <out-table-id>]", + .function = vnet_ip_route_cmd, + .is_mp_safe = 1, +}; +/* *INDENT-ON* */ + +/* + * The next two routines address a longstanding script hemorrhoid. + * Probing a v4 or v6 neighbor needs to appear to be synchronous, + * or dependent route-adds will simply fail. + */ +static clib_error_t * +ip6_probe_neighbor_wait (vlib_main_t * vm, ip6_address_t * a, u32 sw_if_index, + int retry_count) +{ + vnet_main_t *vnm = vnet_get_main (); + clib_error_t *e; + int i; + int resolved = 0; + uword event_type; + uword *event_data = 0; + + ASSERT (vlib_in_process_context (vm)); + + if (retry_count > 0) + vnet_register_ip6_neighbor_resolution_event + (vnm, a, vlib_get_current_process (vm)->node_runtime.node_index, + 1 /* event */ , 0 /* data */ ); + + for (i = 0; i < retry_count; i++) + { + /* The interface may be down, etc. */ + e = ip6_probe_neighbor (vm, a, sw_if_index); + + if (e) + return e; + + vlib_process_wait_for_event_or_clock (vm, 1.0); + event_type = vlib_process_get_events (vm, &event_data); + switch (event_type) + { + case 1: /* resolved... */ + vlib_cli_output (vm, "Resolved %U", format_ip6_address, a); + resolved = 1; + goto done; + + case ~0: /* timeout */ + break; + + default: + clib_warning ("unknown event_type %d", event_type); + } + vec_reset_length (event_data); + } + +done: + + if (!resolved) + return clib_error_return (0, "Resolution failed for %U", + format_ip6_address, a); + return 0; +} + +static clib_error_t * +ip4_probe_neighbor_wait (vlib_main_t * vm, ip4_address_t * a, u32 sw_if_index, + int retry_count) +{ + vnet_main_t *vnm = vnet_get_main (); + clib_error_t *e; + int i; + int resolved = 0; + uword event_type; + uword *event_data = 0; + + ASSERT (vlib_in_process_context (vm)); + + if (retry_count > 0) + vnet_register_ip4_arp_resolution_event + (vnm, a, vlib_get_current_process (vm)->node_runtime.node_index, + 1 /* event */ , 0 /* data */ ); + + for (i = 0; i < retry_count; i++) + { + /* The interface may be down, etc. */ + e = ip4_probe_neighbor (vm, a, sw_if_index); + + if (e) + return e; + + vlib_process_wait_for_event_or_clock (vm, 1.0); + event_type = vlib_process_get_events (vm, &event_data); + switch (event_type) + { + case 1: /* resolved... */ + vlib_cli_output (vm, "Resolved %U", format_ip4_address, a); + resolved = 1; + goto done; + + case ~0: /* timeout */ + break; + + default: + clib_warning ("unknown event_type %d", event_type); + } + vec_reset_length (event_data); + } + +done: + + vec_reset_length (event_data); + + if (!resolved) + return clib_error_return (0, "Resolution failed for %U", + format_ip4_address, a); + return 0; +} + +static clib_error_t * +probe_neighbor_address (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + vnet_main_t *vnm = vnet_get_main (); + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t a4; + ip6_address_t a6; + clib_error_t *error = 0; + u32 sw_if_index = ~0; + int retry_count = 3; + int is_ip4 = 1; + int address_set = 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_user (line_input, unformat_vnet_sw_interface, vnm, + &sw_if_index)) + ; + else if (unformat (line_input, "retry %d", &retry_count)) + ; + + else if (unformat (line_input, "%U", unformat_ip4_address, &a4)) + address_set++; + else if (unformat (line_input, "%U", unformat_ip6_address, &a6)) + { + address_set++; + is_ip4 = 0; + } + else + return clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + } + + unformat_free (line_input); + + if (sw_if_index == ~0) + return clib_error_return (0, "Interface required, not set."); + if (address_set == 0) + return clib_error_return (0, "ip address required, not set."); + if (address_set > 1) + return clib_error_return (0, "Multiple ip addresses not supported."); + + if (is_ip4) + error = ip4_probe_neighbor_wait (vm, &a4, sw_if_index, retry_count); + else + error = ip6_probe_neighbor_wait (vm, &a6, sw_if_index, retry_count); + + return error; +} + +/*? + * The '<em>ip probe-neighbor</em>' command ARPs for IPv4 addresses or + * attempts IPv6 neighbor discovery depending on the supplied IP address + * format. + * + * @note This command will not immediately affect the indicated FIB; it + * is not suitable for use in establishing a FIB entry prior to adding + * recursive FIB entries. As in: don't use it in a script to probe a + * gateway prior to adding a default route. It won't work. Instead, + * configure a static ARP cache entry [see '<em>set ip arp</em>'], or + * a static IPv6 neighbor [see '<em>set ip6 neighbor</em>']. + * + * @cliexpar + * Example of probe for an IPv4 address: + * @cliexcmd{ip probe-neighbor GigabitEthernet2/0/0 172.16.1.2} +?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (ip_probe_neighbor_command, static) = { + .path = "ip probe-neighbor", + .function = probe_neighbor_address, + .short_help = "ip probe-neighbor <interface> <ip4-addr> | <ip6-addr> [retry nn]", + .is_mp_safe = 1, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |