diff options
Diffstat (limited to 'src/plugins/srv6-am/am.c')
| -rw-r--r-- | src/plugins/srv6-am/am.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/src/plugins/srv6-am/am.c b/src/plugins/srv6-am/am.c new file mode 100644 index 00000000000..877b1b3c116 --- /dev/null +++ b/src/plugins/srv6-am/am.c @@ -0,0 +1,249 @@ +/* + * 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. + */ +/* + *------------------------------------------------------------------ + * am.c - SRv6 Masquerading Proxy (AM) function + *------------------------------------------------------------------ + */ + +#include <vnet/vnet.h> +#include <vnet/adj/adj.h> +#include <vnet/plugin/plugin.h> +#include <vpp/app/version.h> +#include <srv6-am/am.h> + +unsigned char function_name[] = "SRv6-AM-plugin"; +unsigned char keyword_str[] = "End.AM"; +unsigned char def_str[] = "Endpoint to SR-unaware appliance via masquerading"; +unsigned char params_str[] = "nh <next-hop> oif <iface-out> iif <iface-in>"; + + +/*****************************************/ +/* SRv6 LocalSID instantiation and removal functions */ +static int +srv6_am_localsid_creation_fn (ip6_sr_localsid_t * localsid) +{ + srv6_am_main_t *sm = &srv6_am_main; + srv6_am_localsid_t *ls_mem = localsid->plugin_mem; + adj_index_t nh_adj_index = ADJ_INDEX_INVALID; + + /* Step 1: Prepare xconnect adjacency for sending packets to the VNF */ + + /* Retrieve the adjacency corresponding to the (OIF, next_hop) */ + nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, + VNET_LINK_IP6, &ls_mem->nh_addr, + ls_mem->sw_if_index_out); + if (nh_adj_index == ADJ_INDEX_INVALID) + return -5; + + localsid->nh_adj = nh_adj_index; + + + /* Step 2: Prepare inbound policy for packets returning from the VNF */ + + /* Sanitise the SW_IF_INDEX */ + if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces, + ls_mem->sw_if_index_in)) + return -3; + + vnet_sw_interface_t *sw = vnet_get_sw_interface (sm->vnet_main, + ls_mem->sw_if_index_in); + if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE) + return -3; + + int ret = vnet_feature_enable_disable ("ip6-unicast", "srv6-am-rewrite", + ls_mem->sw_if_index_in, 1, 0, 0); + if (ret != 0) + return -1; + + return 0; +} + +static int +srv6_am_localsid_removal_fn (ip6_sr_localsid_t * localsid) +{ + srv6_am_localsid_t *ls_mem = localsid->plugin_mem; + + /* Remove hardware indirection (from sr_steering.c:137) */ + int ret = vnet_feature_enable_disable ("ip6-unicast", "srv6-am-rewrite", + ls_mem->sw_if_index_in, 0, 0, 0); + if (ret != 0) + return -1; + + /* Unlock (OIF, NHOP) adjacency (from sr_localsid.c:103) */ + adj_unlock (localsid->nh_adj); + + /* Clean up local SID memory */ + clib_mem_free (localsid->plugin_mem); + + return 0; +} + +/**********************************/ +/* SRv6 LocalSID format functions */ +/* + * Prints nicely the parameters of a localsid + * Example: print "Table 5" + */ +u8 * +format_srv6_am_localsid (u8 * s, va_list * args) +{ + srv6_am_localsid_t *ls_mem = va_arg (*args, void *); + + vnet_main_t *vnm = vnet_get_main (); + + return (format (s, + "Next-hop:\t%U\n" + "\tOutgoing iface: %U\n" + "\tIncoming iface: %U", + format_ip6_address, &ls_mem->nh_addr.ip6, + format_vnet_sw_if_index_name, vnm, ls_mem->sw_if_index_out, + format_vnet_sw_if_index_name, vnm, ls_mem->sw_if_index_in)); +} + +/* + * Process the parameters of a localsid + * Example: process from: + * sr localsid address cafe::1 behavior new_srv6_localsid 5 + * everything from behavior on... so in this case 'new_srv6_localsid 5' + * Notice that it MUST match the keyword_str and params_str defined above. + */ +uword +unformat_srv6_am_localsid (unformat_input_t * input, va_list * args) +{ + void **plugin_mem_p = va_arg (*args, void **); + srv6_am_localsid_t *ls_mem; + + vnet_main_t *vnm = vnet_get_main (); + + ip46_address_t nh_addr; + u32 sw_if_index_out; + u32 sw_if_index_in; + + if (unformat (input, "end.am nh %U oif %U iif %U", + unformat_ip6_address, &nh_addr.ip6, + unformat_vnet_sw_interface, vnm, &sw_if_index_out, + unformat_vnet_sw_interface, vnm, &sw_if_index_in)) + { + /* Allocate a portion of memory */ + ls_mem = clib_mem_alloc_aligned_at_offset (sizeof *ls_mem, 0, 0, 1); + + /* Set to zero the memory */ + memset (ls_mem, 0, sizeof *ls_mem); + + /* Our brand-new car is ready */ + clib_memcpy (&ls_mem->nh_addr.ip6, &nh_addr.ip6, + sizeof (ip6_address_t)); + ls_mem->sw_if_index_out = sw_if_index_out; + ls_mem->sw_if_index_in = sw_if_index_in; + + /* Dont forget to add it to the localsid */ + *plugin_mem_p = ls_mem; + return 1; + } + return 0; +} + +/*************************/ +/* SRv6 LocalSID FIB DPO */ +static u8 * +format_srv6_am_dpo (u8 * s, va_list * args) +{ + index_t index = va_arg (*args, index_t); + CLIB_UNUSED (u32 indent) = va_arg (*args, u32); + + return (format (s, "SR: dynamic_proxy_index:[%u]", index)); +} + +void +srv6_am_dpo_lock (dpo_id_t * dpo) +{ +} + +void +srv6_am_dpo_unlock (dpo_id_t * dpo) +{ +} + +const static dpo_vft_t srv6_am_vft = { + .dv_lock = srv6_am_dpo_lock, + .dv_unlock = srv6_am_dpo_unlock, + .dv_format = format_srv6_am_dpo, +}; + +const static char *const srv6_am_ip6_nodes[] = { + "srv6-am-localsid", + NULL, +}; + +const static char *const *const srv6_am_nodes[DPO_PROTO_NUM] = { + [DPO_PROTO_IP6] = srv6_am_ip6_nodes, +}; + +/**********************/ +static clib_error_t * +srv6_am_init (vlib_main_t * vm) +{ + srv6_am_main_t *sm = &srv6_am_main; + int rv = 0; + + sm->vlib_main = vm; + sm->vnet_main = vnet_get_main (); + + /* Create DPO */ + sm->srv6_am_dpo_type = dpo_register_new_type (&srv6_am_vft, srv6_am_nodes); + + /* Register SRv6 LocalSID */ + rv = sr_localsid_register_function (vm, + function_name, + keyword_str, + def_str, + params_str, + &sm->srv6_am_dpo_type, + format_srv6_am_localsid, + unformat_srv6_am_localsid, + srv6_am_localsid_creation_fn, + srv6_am_localsid_removal_fn); + if (rv < 0) + clib_error_return (0, "SRv6 LocalSID function could not be registered."); + else + sm->srv6_localsid_behavior_id = rv; + + return 0; +} + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (srv6_am_rewrite, static) = +{ + .arc_name = "ip6-unicast", + .node_name = "srv6-am-rewrite", + .runs_before = 0, +}; + +VLIB_INIT_FUNCTION (srv6_am_init); + +VLIB_PLUGIN_REGISTER () = { + .version = VPP_BUILD_VER, + .description = "Masquerading SRv6 proxy", +}; +/* *INDENT-ON* */ + +/* +* fd.io coding-style-patch-verification: ON +* +* Local Variables: +* eval: (c-set-style "gnu") +* End: +*/ |