From ba7992aa62523d014b55802463fb3357c7099b70 Mon Sep 17 00:00:00 2001 From: Francois Clad Date: Tue, 16 Jan 2018 17:52:24 +0100 Subject: SRv6 static proxy plugin Change-Id: Ia0654461d9fa36503323a8375997719c873d23b9 Signed-off-by: Francois Clad --- src/plugins/srv6-as/as.c | 502 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 502 insertions(+) create mode 100644 src/plugins/srv6-as/as.c (limited to 'src/plugins/srv6-as/as.c') diff --git a/src/plugins/srv6-as/as.c b/src/plugins/srv6-as/as.c new file mode 100644 index 00000000000..d027656b6fc --- /dev/null +++ b/src/plugins/srv6-as/as.c @@ -0,0 +1,502 @@ +/* + * 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. + */ +/* + *------------------------------------------------------------------ + * as.c - SRv6 Static Proxy (AS) function + *------------------------------------------------------------------ + */ + +#include +#include +#include +#include + +#define SID_CREATE_IFACE_FEATURE_ERROR -1 +#define SID_CREATE_INVALID_IFACE_TYPE -3 +#define SID_CREATE_INVALID_IFACE_INDEX -4 +#define SID_CREATE_INVALID_ADJ_INDEX -5 + +unsigned char function_name[] = "SRv6-AS-plugin"; +unsigned char keyword_str[] = "End.AS"; +unsigned char def_str[] = + "Endpoint with static proxy to SR-unaware appliance"; +unsigned char params_str[] = + "nh oif iif src next [next ...]"; + + +static inline u8 * +prepare_rewrite (ip6_address_t src_addr, ip6_address_t * sid_list, + u8 protocol) +{ + u8 *rewrite_str = NULL; + u32 rewrite_len = IPv6_DEFAULT_HEADER_LENGTH; + + u8 num_sids = vec_len (sid_list); + u32 sr_hdr_len = 0; + + if (num_sids > 1) + { + sr_hdr_len = + sizeof (ip6_sr_header_t) + num_sids * sizeof (ip6_address_t); + rewrite_len += sr_hdr_len; + } + + vec_validate (rewrite_str, rewrite_len - 1); + + /* Fill IP header */ + ip6_header_t *iph = (ip6_header_t *) rewrite_str; + iph->ip_version_traffic_class_and_flow_label = + clib_host_to_net_u32 (0 | ((6 & 0xF) << 28)); + iph->src_address = src_addr; + iph->dst_address = sid_list[0]; + iph->payload_length = sr_hdr_len; + iph->hop_limit = IPv6_DEFAULT_HOP_LIMIT; + + if (num_sids > 1) + { + /* Set Next Header value to Routing Extension */ + iph->protocol = IP_PROTOCOL_IPV6_ROUTE; + + /* Fill SR header */ + ip6_sr_header_t *srh = (ip6_sr_header_t *) (iph + 1); + srh->protocol = protocol; + srh->length = sr_hdr_len / 8 - 1; + srh->type = ROUTING_HEADER_TYPE_SR; + srh->segments_left = num_sids - 1; + srh->first_segment = num_sids - 1; + srh->flags = 0x00; + srh->reserved = 0x00; + + /* Fill segment list */ + ip6_address_t *this_address; + ip6_address_t *addrp = srh->segments + srh->first_segment; + vec_foreach (this_address, sid_list) + { + *addrp = *this_address; + addrp--; + } + } + else + { + /* Set Next Header value to inner protocol */ + iph->protocol = protocol; + } + + return rewrite_str; +} + +static inline void +free_ls_mem (srv6_as_localsid_t * ls_mem) +{ + vec_free (ls_mem->rewrite); + vec_free (ls_mem->sid_list); + clib_mem_free (ls_mem); +} + + +/*****************************************/ +/* SRv6 LocalSID instantiation and removal functions */ +static int +srv6_as_localsid_creation_fn (ip6_sr_localsid_t * localsid) +{ + ip6_sr_main_t *srm = &sr_main; + srv6_as_main_t *sm = &srv6_as_main; + srv6_as_localsid_t *ls_mem = localsid->plugin_mem; + u32 localsid_index = localsid - srm->localsids; + + /* Step 1: Prepare xconnect adjacency for sending packets to the VNF */ + + /* Retrieve the adjacency corresponding to the (OIF, next_hop) */ + adj_index_t nh_adj_index = ADJ_INDEX_INVALID; + if (ls_mem->ip_version == DA_IP4) + nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, + VNET_LINK_IP4, &ls_mem->nh_addr, + ls_mem->sw_if_index_out); + else if (ls_mem->ip_version == DA_IP6) + 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) + { + free_ls_mem (ls_mem); + return SID_CREATE_INVALID_ADJ_INDEX; + } + + ls_mem->nh_adj = nh_adj_index; + + + /* Step 2: Prepare inbound policy for packets returning from the VNF */ + + /* Make sure the provided incoming interface index is valid */ + if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces, + ls_mem->sw_if_index_in)) + { + adj_unlock (ls_mem->nh_adj); + free_ls_mem (ls_mem); + return SID_CREATE_INVALID_IFACE_INDEX; + } + + /* Retrieve associated interface structure */ + 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) + { + adj_unlock (ls_mem->nh_adj); + free_ls_mem (ls_mem); + return SID_CREATE_INVALID_IFACE_TYPE; + } + + if (ls_mem->ip_version == DA_IP4) + { + /* Enable End.AS4 rewrite node for this interface */ + int ret = + vnet_feature_enable_disable ("ip4-unicast", "srv6-as4-rewrite", + ls_mem->sw_if_index_in, 1, 0, 0); + if (ret != 0) + { + adj_unlock (ls_mem->nh_adj); + free_ls_mem (ls_mem); + return SID_CREATE_IFACE_FEATURE_ERROR; + } + + /* Prepare rewrite string */ + ls_mem->rewrite = prepare_rewrite (ls_mem->src_addr, ls_mem->sid_list, + IP_PROTOCOL_IP_IN_IP); + + /* Associate local SID index to this interface (resize vector if needed) */ + if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid4)) + { + vec_resize (sm->sw_iface_localsid4, + (pool_len (sm->vnet_main->interface_main.sw_interfaces) + - vec_len (sm->sw_iface_localsid4))); + } + sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = localsid_index; + } + else if (ls_mem->ip_version == DA_IP6) + { + /* Enable End.AS6 rewrite node for this interface */ + int ret = + vnet_feature_enable_disable ("ip6-unicast", "srv6-as6-rewrite", + ls_mem->sw_if_index_in, 1, 0, 0); + if (ret != 0) + { + adj_unlock (ls_mem->nh_adj); + free_ls_mem (ls_mem); + return SID_CREATE_IFACE_FEATURE_ERROR; + } + + /* Prepare rewrite string */ + ls_mem->rewrite = prepare_rewrite (ls_mem->src_addr, ls_mem->sid_list, + IP_PROTOCOL_IPV6); + + /* Associate local SID index to this interface (resize vector if needed) */ + if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid6)) + { + vec_resize (sm->sw_iface_localsid6, + (pool_len (sm->vnet_main->interface_main.sw_interfaces) + - vec_len (sm->sw_iface_localsid6))); + } + sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = localsid_index; + } + + return 0; +} + +static int +srv6_as_localsid_removal_fn (ip6_sr_localsid_t * localsid) +{ + srv6_as_main_t *sm = &srv6_as_main; + srv6_as_localsid_t *ls_mem = localsid->plugin_mem; + + if (ls_mem->ip_version == DA_IP4) + { + /* Disable End.AS4 rewrite node for this interface */ + int ret; + ret = vnet_feature_enable_disable ("ip4-unicast", "srv6-as4-rewrite", + ls_mem->sw_if_index_in, 0, 0, 0); + if (ret != 0) + return -1; + + /* Remove local SID index from interface table */ + sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = ~(u32) 0; + } + else if (ls_mem->ip_version == DA_IP6) + { + /* Disable End.AS6 rewrite node for this interface */ + int ret; + ret = vnet_feature_enable_disable ("ip6-unicast", "srv6-as6-rewrite", + ls_mem->sw_if_index_in, 0, 0, 0); + if (ret != 0) + return -1; + + /* Remove local SID index from interface table */ + sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = ~(u32) 0; + } + + + /* Unlock (OIF, NHOP) adjacency (from sr_localsid.c:103) */ + adj_unlock (ls_mem->nh_adj); + + /* Clean up local SID memory */ + free_ls_mem (ls_mem); + + return 0; +} + +/**********************************/ +/* SRv6 LocalSID format functions */ +/* + * Prints nicely the parameters of a localsid + * Example: print "Table 5" + */ +u8 * +format_srv6_as_localsid (u8 * s, va_list * args) +{ + srv6_as_localsid_t *ls_mem = va_arg (*args, void *); + + vnet_main_t *vnm = vnet_get_main (); + + if (ls_mem->ip_version == DA_IP4) + { + s = + format (s, "Next-hop:\t%U\n", format_ip4_address, + &ls_mem->nh_addr.ip4); + } + else + { + s = + format (s, "Next-hop:\t%U\n", format_ip6_address, + &ls_mem->nh_addr.ip6); + } + + s = format (s, "\tOutgoing iface:\t%U\n", format_vnet_sw_if_index_name, vnm, + ls_mem->sw_if_index_out); + s = format (s, "\tIncoming iface:\t%U\n", format_vnet_sw_if_index_name, vnm, + ls_mem->sw_if_index_in); + s = format (s, "\tSource address:\t%U\n", format_ip6_address, + &ls_mem->src_addr); + + s = format (s, "\tSegment list:\t< "); + ip6_address_t *addr; + vec_foreach (addr, ls_mem->sid_list) + { + s = format (s, "%U, ", format_ip6_address, addr); + } + s = format (s, "\b\b > "); + + return s; +} + +/* + * 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_as_localsid (unformat_input_t * input, va_list * args) +{ + void **plugin_mem_p = va_arg (*args, void **); + srv6_as_localsid_t *ls_mem; + + vnet_main_t *vnm = vnet_get_main (); + + u8 ip_version = 0; + ip46_address_t nh_addr; + u32 sw_if_index_out; + u32 sw_if_index_in; + ip6_address_t src_addr; + ip6_address_t next_sid; + ip6_address_t *sid_list = NULL; + + u8 params = 0; +#define PARAM_AS_NH (1 << 0) +#define PARAM_AS_OIF (1 << 1) +#define PARAM_AS_IIF (1 << 2) +#define PARAM_AS_SRC (1 << 3) + + if (!unformat (input, "end.as")) + return 0; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (!(params & PARAM_AS_NH) && unformat (input, "nh %U", + unformat_ip4_address, + &nh_addr.ip4)) + { + ip_version = DA_IP4; + params |= PARAM_AS_NH; + } + if (!(params & PARAM_AS_NH) && unformat (input, "nh %U", + unformat_ip6_address, + &nh_addr.ip6)) + { + ip_version = DA_IP6; + params |= PARAM_AS_NH; + } + else if (!(params & PARAM_AS_OIF) && unformat (input, "oif %U", + unformat_vnet_sw_interface, + vnm, &sw_if_index_out)) + { + params |= PARAM_AS_OIF; + } + else if (!(params & PARAM_AS_IIF) && unformat (input, "iif %U", + unformat_vnet_sw_interface, + vnm, &sw_if_index_in)) + { + params |= PARAM_AS_IIF; + } + else if (!(params & PARAM_AS_SRC) && unformat (input, "src %U", + unformat_ip6_address, + &src_addr)) + { + params |= PARAM_AS_SRC; + } + else if (unformat (input, "next %U", unformat_ip6_address, &next_sid)) + { + vec_add1 (sid_list, next_sid); + } + else + { + break; + } + } + + /* Make sure that all parameters are supplied */ + u8 params_chk = (PARAM_AS_NH | PARAM_AS_OIF | PARAM_AS_IIF | PARAM_AS_SRC); + if ((params & params_chk) != params_chk || sid_list == NULL) + { + vec_free (sid_list); + return 0; + } + + /* Allocate and initialize memory block for local SID parameters */ + ls_mem = clib_mem_alloc_aligned_at_offset (sizeof *ls_mem, 0, 0, 1); + memset (ls_mem, 0, sizeof *ls_mem); + *plugin_mem_p = ls_mem; + + /* Set local SID parameters */ + ls_mem->ip_version = ip_version; + if (ip_version == DA_IP4) + ls_mem->nh_addr.ip4 = nh_addr.ip4; + else + ls_mem->nh_addr.ip6 = nh_addr.ip6; + ls_mem->sw_if_index_out = sw_if_index_out; + ls_mem->sw_if_index_in = sw_if_index_in; + ls_mem->src_addr = src_addr; + ls_mem->sid_list = sid_list; + + return 1; +} + +/*************************/ +/* SRv6 LocalSID FIB DPO */ +static u8 * +format_srv6_as_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: static_proxy_index:[%u]", index)); +} + +void +srv6_as_dpo_lock (dpo_id_t * dpo) +{ +} + +void +srv6_as_dpo_unlock (dpo_id_t * dpo) +{ +} + +const static dpo_vft_t srv6_as_vft = { + .dv_lock = srv6_as_dpo_lock, + .dv_unlock = srv6_as_dpo_unlock, + .dv_format = format_srv6_as_dpo, +}; + +const static char *const srv6_as_ip6_nodes[] = { + "srv6-as-localsid", + NULL, +}; + +const static char *const *const srv6_as_nodes[DPO_PROTO_NUM] = { + [DPO_PROTO_IP6] = srv6_as_ip6_nodes, +}; + +/**********************/ +static clib_error_t * +srv6_as_init (vlib_main_t * vm) +{ + srv6_as_main_t *sm = &srv6_as_main; + int rv = 0; + + sm->vlib_main = vm; + sm->vnet_main = vnet_get_main (); + + /* Create DPO */ + sm->srv6_as_dpo_type = dpo_register_new_type (&srv6_as_vft, srv6_as_nodes); + + /* Register SRv6 LocalSID */ + rv = sr_localsid_register_function (vm, + function_name, + keyword_str, + def_str, + params_str, + &sm->srv6_as_dpo_type, + format_srv6_as_localsid, + unformat_srv6_as_localsid, + srv6_as_localsid_creation_fn, + srv6_as_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_as4_rewrite, static) = +{ + .arc_name = "ip4-unicast", + .node_name = "srv6-as4-rewrite", + .runs_before = 0, +}; + +VNET_FEATURE_INIT (srv6_as6_rewrite, static) = +{ + .arc_name = "ip6-unicast", + .node_name = "srv6-as6-rewrite", + .runs_before = 0, +}; + +VLIB_INIT_FUNCTION (srv6_as_init); + +VLIB_PLUGIN_REGISTER () = { + .version = "1.0", + .description = "Static SRv6 proxy", +}; +/* *INDENT-ON* */ + +/* +* fd.io coding-style-patch-verification: ON +* +* Local Variables: +* eval: (c-set-style "gnu") +* End: +*/ -- cgit 1.2.3-korg