From fb38095d1c9d1b84850f345f0344f82b9ae2c375 Mon Sep 17 00:00:00 2001 From: Pablo Camarillo Date: Wed, 7 Dec 2016 18:34:18 +0100 Subject: Evolving SRv6 (Segment Routing for IPv6) Implements: 1.- SR Policies with several (weighted) SID lists 2.- Binding SID 3.- SR LocalSIDs with support for the following functions - End - End.X - End.DX6 - End.DX4 - End.DX2 - End.DT6 - End.DT2 - End.B6 - End.B6.Encaps 4.- SR Steering policies (to steer a traffic through an SR Policy) - Support for IPv6 traffic (IPv6 Encapsulation / SRH insertion) - Support for IPv4 traffic (IPv6 Encapsulation) - Support for L2 traffic (T.Insert / T.Encaps) 5.- Doxygen documentation 6.- Framework (APIs) to allow the definition of new SR LocalSID behaviors by means of plugins 7.- Sample SRv6 LocalSID plugin Change-Id: I2de3d126699d4f11f54c0f7f3b71420ea41fd389 Signed-off-by: Pablo Camarillo --- src/vnet/sr/sr_steering.c | 568 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 568 insertions(+) create mode 100755 src/vnet/sr/sr_steering.c (limited to 'src/vnet/sr/sr_steering.c') diff --git a/src/vnet/sr/sr_steering.c b/src/vnet/sr/sr_steering.c new file mode 100755 index 00000000000..86d6f27cbe1 --- /dev/null +++ b/src/vnet/sr/sr_steering.c @@ -0,0 +1,568 @@ +/* + * sr_steering.c: ipv6 segment routing steering into SR policy + * + * 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. + */ + +/** + * @file + * @brief Packet steering into SR Policies + * + * This file is in charge of handling the FIB appropiatly to steer packets + * through SR Policies as defined in 'sr_policy_rewrite.c'. Notice that here + * we are only doing steering. SR policy application is done in + * sr_policy_rewrite.c + * + * Supports: + * - Steering of IPv6 traffic Destination Address based + * - Steering of IPv4 traffic Destination Address based + * - Steering of L2 frames, interface based (sw interface) + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +/** + * @brief Steer traffic L2 and L3 traffic through a given SR policy + * + * @param is_del + * @param bsid is the bindingSID of the SR Policy (alt to sr_policy_index) + * @param sr_policy is the index of the SR Policy (alt to bsid) + * @param table_id is the VRF where to install the FIB entry for the BSID + * @param prefix is the IPv4/v6 address for L3 traffic type + * @param mask_width is the mask for L3 traffic type + * @param sw_if_index is the incoming interface for L2 traffic + * @param traffic_type describes the type of traffic + * + * @return 0 if correct, else error + */ +int +sr_steering_policy (int is_del, ip6_address_t * bsid, u32 sr_policy_index, + u32 table_id, ip46_address_t * prefix, u32 mask_width, + u32 sw_if_index, u8 traffic_type) +{ + ip6_sr_main_t *sm = &sr_main; + sr_steering_key_t key, *key_copy; + ip6_sr_steering_policy_t *steer_pl; + fib_prefix_t pfx = { 0 }; + + ip6_sr_policy_t *sr_policy = 0; + uword *p = 0; + + hash_pair_t *hp; + + /* Compute the steer policy key */ + if (prefix) + { + key.l3.prefix.as_u64[0] = prefix->as_u64[0]; + key.l3.prefix.as_u64[1] = prefix->as_u64[1]; + key.l3.mask_width = mask_width; + key.l3.fib_table = (table_id != (u32) ~ 0 ? table_id : 0); + } + else + { + key.l2.sw_if_index = sw_if_index; + + /* Sanitise the SW_IF_INDEX */ + if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces, + sw_if_index)) + return -3; + + vnet_sw_interface_t *sw = + vnet_get_sw_interface (sm->vnet_main, sw_if_index); + if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE) + return -3; + } + + key.traffic_type = traffic_type; + + /* Search for the item */ + p = hash_get_mem (sm->steer_policies_index_by_key, &key); + + if (p) + { + /* Retrieve Steer Policy function */ + steer_pl = pool_elt_at_index (sm->steer_policies, p[0]); + + if (is_del) + { + if (steer_pl->classify.traffic_type == SR_STEER_IPV6) + { + /* Remove FIB entry */ + pfx.fp_proto = FIB_PROTOCOL_IP6; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip6 = steer_pl->classify.l3.prefix.ip6; + + fib_table_entry_delete (fib_table_id_find_fib_index + (FIB_PROTOCOL_IP6, + steer_pl->classify.l3.fib_table), &pfx, + FIB_SOURCE_SR); + } + else if (steer_pl->classify.traffic_type == SR_STEER_IPV4) + { + /* Remove FIB entry */ + pfx.fp_proto = FIB_PROTOCOL_IP4; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip4 = steer_pl->classify.l3.prefix.ip4; + + fib_table_entry_delete (fib_table_id_find_fib_index + (FIB_PROTOCOL_IP4, + steer_pl->classify.l3.fib_table), &pfx, + FIB_SOURCE_SR); + } + else if (steer_pl->classify.traffic_type == SR_STEER_L2) + { + /* Remove HW redirection */ + vnet_feature_enable_disable ("device-input", + "sr-policy-rewrite-encaps-l2", + sw_if_index, 0, 0, 0); + sm->sw_iface_sr_policies[sw_if_index] = ~(u32) 0; + + /* Remove promiscous mode from interface */ + vnet_main_t *vnm = vnet_get_main (); + ethernet_main_t *em = ðernet_main; + ethernet_interface_t *eif = + ethernet_get_interface (em, sw_if_index); + + if (!eif) + goto cleanup_error_redirection; + + ethernet_set_flags (vnm, sw_if_index, 0); + } + + /* Delete SR steering policy entry */ + pool_put (sm->steer_policies, steer_pl); + hp = hash_get_pair (sm->steer_policies_index_by_key, &key); + key_copy = (void *) (hp->key); + hash_unset_mem (sm->steer_policies_index_by_key, &key); + vec_free (key_copy); + return 1; + } + else /* It means user requested to update an existing SR steering policy */ + { + /* Retrieve SR steering policy */ + if (bsid) + { + p = hash_get_mem (sm->sr_policy_index_by_key, bsid); + if (p) + sr_policy = pool_elt_at_index (sm->sr_policies, p[0]); + else + return -2; + } + else + sr_policy = pool_elt_at_index (sm->sr_policies, sr_policy_index); + + if (!sr_policy) + return -2; + + steer_pl->sr_policy = sr_policy - sm->sr_policies; + + /* Remove old FIB/hw redirection and create a new one */ + if (steer_pl->classify.traffic_type == SR_STEER_IPV6) + { + /* Remove FIB entry */ + pfx.fp_proto = FIB_PROTOCOL_IP6; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip6 = steer_pl->classify.l3.prefix.ip6; + + fib_table_entry_delete (fib_table_id_find_fib_index + (FIB_PROTOCOL_IP6, + steer_pl->classify.l3.fib_table), &pfx, + FIB_SOURCE_SR); + + /* Create a new one */ + goto update_fib; + + } + else if (steer_pl->classify.traffic_type == SR_STEER_IPV4) + { + /* Remove FIB entry */ + pfx.fp_proto = FIB_PROTOCOL_IP4; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip4 = steer_pl->classify.l3.prefix.ip4; + + fib_table_entry_delete (fib_table_id_find_fib_index + (FIB_PROTOCOL_IP4, + steer_pl->classify.l3.fib_table), &pfx, + FIB_SOURCE_SR); + + /* Create a new one */ + goto update_fib; + } + else if (steer_pl->classify.traffic_type == SR_STEER_L2) + { + /* Update L2-HW redirection */ + goto update_fib; + } + } + } + else + /* delete; steering policy does not exist; complain */ + if (is_del) + return -4; + + /* Retrieve SR policy */ + if (bsid) + { + p = hash_get_mem (sm->sr_policy_index_by_key, bsid); + if (p) + sr_policy = pool_elt_at_index (sm->sr_policies, p[0]); + else + return -2; + } + else + sr_policy = pool_elt_at_index (sm->sr_policies, sr_policy_index); + + /* Create a new steering policy */ + pool_get (sm->steer_policies, steer_pl); + memset (steer_pl, 0, sizeof (*steer_pl)); + + if (traffic_type == SR_STEER_IPV4 || traffic_type == SR_STEER_IPV6) + { + clib_memcpy (&steer_pl->classify.l3.prefix, prefix, + sizeof (ip46_address_t)); + steer_pl->classify.l3.mask_width = mask_width; + steer_pl->classify.l3.fib_table = + (table_id != (u32) ~ 0 ? table_id : 0); + steer_pl->classify.traffic_type = traffic_type; + } + else if (traffic_type == SR_STEER_L2) + { + steer_pl->classify.l2.sw_if_index = sw_if_index; + steer_pl->classify.traffic_type = traffic_type; + } + else + { + /* Incorrect API usage. Should never get here */ + pool_put (sm->steer_policies, steer_pl); + hp = hash_get_pair (sm->steer_policies_index_by_key, &key); + key_copy = (void *) (hp->key); + hash_unset_mem (sm->steer_policies_index_by_key, &key); + vec_free (key_copy); + return -1; + } + steer_pl->sr_policy = sr_policy - sm->sr_policies; + + /* Create and store key */ + key_copy = vec_new (sr_steering_key_t, 1); + clib_memcpy (key_copy, &key, sizeof (sr_steering_key_t)); + hash_set_mem (sm->steer_policies_index_by_key, + key_copy, steer_pl - sm->steer_policies); + + if (traffic_type == SR_STEER_L2) + { + if (!sr_policy->is_encap) + goto cleanup_error_encap; + + if (vnet_feature_enable_disable + ("device-input", "sr-policy-rewrite-encaps-l2", sw_if_index, 1, 0, + 0)) + goto cleanup_error_redirection; + + /* Set promiscous mode on interface */ + vnet_main_t *vnm = vnet_get_main (); + ethernet_main_t *em = ðernet_main; + ethernet_interface_t *eif = ethernet_get_interface (em, sw_if_index); + + if (!eif) + goto cleanup_error_redirection; + + ethernet_set_flags (vnm, sw_if_index, + ETHERNET_INTERFACE_FLAG_ACCEPT_ALL); + } + else if (traffic_type == SR_STEER_IPV4) + if (!sr_policy->is_encap) + goto cleanup_error_encap; + +update_fib: + /* FIB API calls - Recursive route through the BindingSID */ + if (traffic_type == SR_STEER_IPV6) + { + pfx.fp_proto = FIB_PROTOCOL_IP6; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip6 = steer_pl->classify.l3.prefix.ip6; + + fib_table_entry_path_add (fib_table_id_find_fib_index (FIB_PROTOCOL_IP6, + (table_id != + (u32) ~ 0 ? + table_id : 0)), + &pfx, FIB_SOURCE_CLI, FIB_ENTRY_FLAG_NONE, + FIB_PROTOCOL_IP6, + (ip46_address_t *) & sr_policy->bsid, ~0, + sm->fib_table_ip6, 1, NULL, + FIB_ROUTE_PATH_FLAG_NONE); + } + else if (traffic_type == SR_STEER_IPV4) + { + pfx.fp_proto = FIB_PROTOCOL_IP4; + pfx.fp_len = steer_pl->classify.l3.mask_width; + pfx.fp_addr.ip4 = steer_pl->classify.l3.prefix.ip4; + + fib_table_entry_path_add (fib_table_id_find_fib_index (FIB_PROTOCOL_IP4, + (table_id != + (u32) ~ 0 ? + table_id : 0)), + &pfx, FIB_SOURCE_CLI, FIB_ENTRY_FLAG_NONE, + FIB_PROTOCOL_IP6, + (ip46_address_t *) & sr_policy->bsid, ~0, + sm->fib_table_ip4, 1, NULL, + FIB_ROUTE_PATH_FLAG_NONE); + } + else if (traffic_type == SR_STEER_L2) + { + if (sw_if_index < vec_len (sm->sw_iface_sr_policies)) + sm->sw_iface_sr_policies[sw_if_index] = steer_pl->sr_policy; + else + { + vec_resize (sm->sw_iface_sr_policies, + (pool_len (sm->vnet_main->interface_main.sw_interfaces) + - vec_len (sm->sw_iface_sr_policies))); + sm->sw_iface_sr_policies[sw_if_index] = steer_pl->sr_policy; + } + } + + return 0; + +cleanup_error_encap: + pool_put (sm->steer_policies, steer_pl); + hp = hash_get_pair (sm->steer_policies_index_by_key, &key); + key_copy = (void *) (hp->key); + hash_unset_mem (sm->steer_policies_index_by_key, &key); + vec_free (key_copy); + return -5; + +cleanup_error_redirection: + pool_put (sm->steer_policies, steer_pl); + hp = hash_get_pair (sm->steer_policies_index_by_key, &key); + key_copy = (void *) (hp->key); + hash_unset_mem (sm->steer_policies_index_by_key, &key); + vec_free (key_copy); + return -3; +} + +static clib_error_t * +sr_steer_policy_command_fn (vlib_main_t * vm, unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + vnet_main_t *vnm = vnet_get_main (); + + int is_del = 0; + + ip46_address_t prefix; + u32 dst_mask_width = 0; + u32 sw_if_index = (u32) ~ 0; + u8 traffic_type = 0; + u32 fib_table = (u32) ~ 0; + + ip6_address_t bsid; + u32 sr_policy_index = (u32) ~ 0; + + u8 sr_policy_set = 0; + + int rv; + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "del")) + is_del = 1; + else if (!traffic_type + && unformat (input, "l3 %U/%d", unformat_ip6_address, + &prefix.ip6, &dst_mask_width)) + traffic_type = SR_STEER_IPV6; + else if (!traffic_type + && unformat (input, "l3 %U/%d", unformat_ip4_address, + &prefix.ip4, &dst_mask_width)) + traffic_type = SR_STEER_IPV4; + else if (!traffic_type + && unformat (input, "l2 %U", unformat_vnet_sw_interface, vnm, + &sw_if_index)) + traffic_type = SR_STEER_L2; + else if (!sr_policy_set + && unformat (input, "via sr policy index %d", + &sr_policy_index)) + sr_policy_set = 1; + else if (!sr_policy_set + && unformat (input, "via sr policy bsid %U", + unformat_ip6_address, &bsid)) + sr_policy_set = 1; + else if (fib_table == (u32) ~ 0 + && unformat (input, "fib-table %d", &fib_table)); + else + break; + } + + if (!traffic_type) + return clib_error_return (0, "No L2/L3 traffic specified"); + if (!sr_policy_set) + return clib_error_return (0, "No SR policy specified"); + + /* Make sure that the prefixes are clean */ + if (traffic_type == SR_STEER_IPV4) + { + u32 mask = + (dst_mask_width ? (0xFFFFFFFFu >> (32 - dst_mask_width)) : 0); + prefix.ip4.as_u32 &= mask; + } + else if (traffic_type == SR_STEER_IPV6) + { + ip6_address_t mask; + ip6_address_mask_from_width (&mask, dst_mask_width); + ip6_address_mask (&prefix.ip6, &mask); + } + + rv = + sr_steering_policy (is_del, (sr_policy_index == ~(u32) 0 ? &bsid : NULL), + sr_policy_index, fib_table, &prefix, dst_mask_width, + sw_if_index, traffic_type); + + switch (rv) + { + case 0: + break; + case 1: + return 0; + case -1: + return clib_error_return (0, "Incorrect API usage."); + case -2: + return clib_error_return (0, + "The requested SR policy could not be located. Review the BSID/index."); + case -3: + return clib_error_return (0, + "Unable to do SW redirect. Incorrect interface."); + case -4: + return clib_error_return (0, + "The requested SR policy could not be deleted. Review the BSID/index."); + case -5: + return clib_error_return (0, + "The SR policy is not an encapsulation one."); + default: + return clib_error_return (0, "BUG: sr steer policy returns %d", rv); + } + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (sr_steer_policy_command, static) = { + .path = "sr steer", + .short_help = "sr steer (del) [l3 |l2 ]" + "via sr policy [index |bsid ]" + "(fib-table )", + .long_help = + "\tSteer a L2 or L3 traffic through an existing SR policy.\n" + "\tExamples:\n" + "\t\tsr steer l3 2001::/64 via sr_policy index 5\n" + "\t\tsr steer l3 2001::/64 via sr_policy bsid 2010::9999:1\n" + "\t\tsr steer l2 GigabitEthernet0/5/0 via sr_policy index 5\n" + "\t\tsr steer del l3 2001::/64 via sr_policy index 5\n", + .function = sr_steer_policy_command_fn, +}; +/* *INDENT-ON* */ + +static clib_error_t * +show_sr_steering_policies_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + ip6_sr_main_t *sm = &sr_main; + ip6_sr_steering_policy_t **steer_policies = 0; + ip6_sr_steering_policy_t *steer_pl; + + vnet_main_t *vnm = vnet_get_main (); + + ip6_sr_policy_t *pl = 0; + int i; + + vlib_cli_output (vm, "SR steering policies:"); + /* *INDENT-OFF* */ + pool_foreach (steer_pl, sm->steer_policies, ({vec_add1(steer_policies, steer_pl);})); + /* *INDENT-ON* */ + vlib_cli_output (vm, "Traffic\t\tSR policy BSID"); + for (i = 0; i < vec_len (steer_policies); i++) + { + steer_pl = steer_policies[i]; + pl = pool_elt_at_index (sm->sr_policies, steer_pl->sr_policy); + if (steer_pl->classify.traffic_type == SR_STEER_L2) + { + vlib_cli_output (vm, "L2 %U\t%U", + format_vnet_sw_if_index_name, vnm, + steer_pl->classify.l2.sw_if_index, + format_ip6_address, &pl->bsid); + } + else if (steer_pl->classify.traffic_type == SR_STEER_IPV4) + { + vlib_cli_output (vm, "L3 %U/%d\t%U", + format_ip4_address, + &steer_pl->classify.l3.prefix.ip4, + steer_pl->classify.l3.mask_width, + format_ip6_address, &pl->bsid); + } + else if (steer_pl->classify.traffic_type == SR_STEER_IPV6) + { + vlib_cli_output (vm, "L3 %U/%d\t%U", + format_ip6_address, + &steer_pl->classify.l3.prefix.ip6, + steer_pl->classify.l3.mask_width, + format_ip6_address, &pl->bsid); + } + } + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_sr_steering_policies_command, static) = { + .path = "show sr steering policies", + .short_help = "show sr steering policies", + .function = show_sr_steering_policies_command_fn, +}; +/* *INDENT-ON* */ + +clib_error_t * +sr_steering_init (vlib_main_t * vm) +{ + ip6_sr_main_t *sm = &sr_main; + + /* Init memory for function keys */ + sm->steer_policies_index_by_key = + hash_create_mem (0, sizeof (sr_steering_key_t), sizeof (uword)); + + sm->sw_iface_sr_policies = 0; + + sm->vnet_main = vnet_get_main (); + + return 0; +} + +VLIB_INIT_FUNCTION (sr_steering_init); + +VNET_FEATURE_INIT (sr_policy_rewrite_encaps_l2, static) = +{ +.arc_name = "device-input",.node_name = + "sr-pl-rewrite-encaps-l2",.runs_before = + VNET_FEATURES ("ethernet-input"),}; + +/* +* fd.io coding-style-patch-verification: ON +* +* Local Variables: +* eval: (c-set-style "gnu") +* End: +*/ -- cgit 1.2.3-korg