/* * dhcp6_proxy_node.c: dhcpv6 proxy node processing * * 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 <vlib/vlib.h> #include <vnet/pg/pg.h> #include <vnet/dhcp/dhcp_proxy.h> #include <vnet/dhcp/dhcp6_packet.h> #include <vnet/mfib/mfib_table.h> #include <vnet/mfib/ip6_mfib.h> #include <vnet/fib/fib.h> static char * dhcpv6_proxy_error_strings[] = { #define dhcpv6_proxy_error(n,s) s, #include <vnet/dhcp/dhcp6_proxy_error.def> #undef dhcpv6_proxy_error }; #define foreach_dhcpv6_proxy_to_server_input_next \ _ (DROP, "error-drop") \ _ (LOOKUP, "ip6-lookup") \ _ (SEND_TO_CLIENT, "dhcpv6-proxy-to-client") typedef enum { #define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s, foreach_dhcpv6_proxy_to_server_input_next #undef _ DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT, } dhcpv6_proxy_to_server_input_next_t; typedef struct { /* 0 => to server, 1 => to client */ int which; u8 packet_data[64]; u32 error; u32 sw_if_index; u32 original_sw_if_index; } dhcpv6_proxy_trace_t; static vlib_node_registration_t dhcpv6_proxy_to_server_node; static vlib_node_registration_t dhcpv6_proxy_to_client_node; /* all DHCP servers address */ static ip6_address_t all_dhcpv6_server_address; static ip6_address_t all_dhcpv6_server_relay_agent_address; static u8 * format_dhcpv6_proxy_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 *); dhcpv6_proxy_trace_t * t = va_arg (*args, dhcpv6_proxy_trace_t *); if (t->which == 0) s = format (s, "DHCPV6 proxy: sent to server %U", format_ip6_address, &t->packet_data, sizeof (ip6_address_t)); else s = format (s, "DHCPV6 proxy: sent to client from %U", format_ip6_address, &t->packet_data, sizeof (ip6_address_t)); if (t->error != (u32)~0) s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]); s = format (s, " original_sw_if_index: %d, sw_if_index: %d\n", t->original_sw_if_index, t->sw_if_index); return s; } static u8 * format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args) { dhcpv6_header_t * h = va_arg (*args, dhcpv6_header_t *); u32 max_header_bytes = va_arg (*args, u32); u32 header_bytes; header_bytes = sizeof (h[0]); if (max_header_bytes != 0 && header_bytes > max_header_bytes) return format (s, "dhcpv6 header truncated"); s = format (s, "DHCPV6 Proxy"); return s; } /* get first interface address */ static ip6_address_t * ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index) { ip_lookup_main_t * lm = &im->lookup_main; ip_interface_address_t * ia = 0; ip6_address_t * result = 0; foreach_ip_interface_address (lm, ia, sw_if_index, 1 /* honor unnumbered */, ({ ip6_address_t * a = ip_interface_address_get_address (lm, ia); if ((a->as_u8[0] & 0xe0) == 0x20 || (a->as_u8[0] & 0xfe) == 0xfc) { result = a; break; } })); return result; } static inline void copy_ip6_address (ip6_address_t *dst, ip6_address_t *src) { dst->as_u64[0] = src->as_u64[0]; dst->as_u64[1] = src->as_u64[1]; } static uword dhcpv6_proxy_to_server_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, next_index, * from, * to_next; dhcp_proxy_main_t * dpm = &dhcp_proxy_main; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; u32 pkts_to_server=0, pkts_to_client=0, pkts_no_server=0; u32 pkts_no_interface_address=0, pkts_no_exceeding_max_hop=0; u32 pkts_no_src_address=0; u32 pkts_wrong_msg_type=0; u32 pkts_too_big=0; ip6_main_t * im = &ip6_main; ip6_address_t * src; int bogus_length; dhcp_proxy_t *proxy; dhcp_server_t *server; u32 rx_fib_idx = 0, server_fib_idx = 0; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { vnet_main_t *vnm = vnet_get_main(); u32 sw_if_index = 0; u32 rx_sw_if_index = 0; vnet_sw_interface_t *swif; u32 bi0; vlib_buffer_t * b0; udp_header_t * u0, *u1; dhcpv6_header_t * h0; // client msg hdr ip6_header_t * ip0, *ip1; ip6_address_t _ia0, *ia0=&_ia0; u32 next0; u32 error0 = (u32) ~0; dhcpv6_option_t *fwd_opt; dhcpv6_relay_hdr_t *r1; u16 len; dhcpv6_int_id_t *id1; dhcpv6_vss_t *vss1; dhcpv6_client_mac_t *cmac; // client mac ethernet_header_t * e_h0; u8 client_src_mac[6]; vlib_buffer_free_list_t *fl; dhcp_vss_t *vss; u8 is_solicit = 0; bi0 = from[0]; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); h0 = vlib_buffer_get_current (b0); /* * udp_local hands us the DHCPV6 header. */ u0 = (void *)h0 -(sizeof(*u0)); ip0 = (void *)u0 -(sizeof(*ip0)); e_h0 = (void *)ip0 - ethernet_buffer_header_size(b0); clib_memcpy(client_src_mac, e_h0->src_address, 6); switch (h0->u.msg_type) { case DHCPV6_MSG_SOLICIT: case DHCPV6_MSG_REQUEST: case DHCPV6_MSG_CONFIRM: case DHCPV6_MSG_RENEW: case DHCPV6_MSG_REBIND: case DHCPV6_MSG_RELEASE: case DHCPV6_MSG_DECLINE: case DHCPV6_MSG_INFORMATION_REQUEST: case DHCPV6_MSG_RELAY_FORW: /* send to server */ break; case DHCPV6_MSG_RELAY_REPL: /* send to client */ next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT; error0 = 0; pkts_to_client++; goto do_enqueue; default: /* drop the packet */ pkts_wrong_msg_type++; error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; goto do_trace; } /* Send to DHCPV6 server via the configured FIB */ rx_sw_if_index = sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_idx = im->mfib_index_by_sw_if_index [rx_sw_if_index]; proxy = dhcp_get_proxy(dpm, rx_fib_idx, FIB_PROTOCOL_IP6); if (PREDICT_FALSE (NULL == proxy)) { error0 = DHCPV6_PROXY_ERROR_NO_SERVER; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_server++; goto do_trace; } server = &proxy->dhcp_servers[0]; server_fib_idx = server->server_fib_index; vnet_buffer(b0)->sw_if_index[VLIB_TX] = server_fib_idx; /* relay-option header pointer */ vlib_buffer_advance(b0, -(sizeof(*fwd_opt))); fwd_opt = vlib_buffer_get_current(b0); /* relay message header pointer */ vlib_buffer_advance(b0, -(sizeof(*r1))); r1 = vlib_buffer_get_current(b0); vlib_buffer_advance(b0, -(sizeof(*u1))); u1 = vlib_buffer_get_current(b0); vlib_buffer_advance(b0, -(sizeof(*ip1))); ip1 = vlib_buffer_get_current(b0); /* fill in all that rubbish... */ len = clib_net_to_host_u16(u0->length) - sizeof(udp_header_t); copy_ip6_address(&r1->peer_addr, &ip0->src_address); r1->msg_type = DHCPV6_MSG_RELAY_FORW; fwd_opt->length = clib_host_to_net_u16(len); fwd_opt->option = clib_host_to_net_u16(DHCPV6_OPTION_RELAY_MSG); r1->hop_count++; r1->hop_count = (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count; if (PREDICT_FALSE(r1->hop_count >= HOP_COUNT_LIMIT)) { error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_exceeding_max_hop++; goto do_trace; } /* If relay-fwd and src address is site or global unicast address */ if (h0->u.msg_type == DHCPV6_MSG_RELAY_FORW && ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 || (ip0->src_address.as_u8[0] & 0xfe) == 0xfc)) { /* Set link address to zero */ r1->link_addr.as_u64[0] = 0; r1->link_addr.as_u64[1] = 0; goto link_address_set; } /* if receiving interface is unnumbered, use receiving interface * IP address as link address, otherwise use the loopback interface * IP address as link address. */ swif = vnet_get_sw_interface (vnm, rx_sw_if_index); if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) sw_if_index = swif->unnumbered_sw_if_index; ia0 = ip6_interface_first_global_or_site_address(&ip6_main, sw_if_index); if (ia0 == 0) { error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_interface_address++; goto do_trace; } copy_ip6_address(&r1->link_addr, ia0); link_address_set: fl = vlib_buffer_get_free_list (vm, vlib_buffer_get_free_list_index (b0)); if ((b0->current_length+sizeof(*id1)+sizeof(*vss1)+sizeof(*cmac)) > fl->n_data_bytes) { error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_too_big++; goto do_trace; } id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length); b0->current_length += (sizeof (*id1)); id1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_INTERFACE_ID); id1->opt.length = clib_host_to_net_u16(sizeof(rx_sw_if_index)); id1->int_idx = clib_host_to_net_u32(rx_sw_if_index); u1->length =0; if (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW) { cmac = (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length); b0->current_length += (sizeof (*cmac)); cmac->opt.length =clib_host_to_net_u16(sizeof(*cmac) - sizeof(cmac->opt)); cmac->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS); cmac->link_type = clib_host_to_net_u16(1); // ethernet clib_memcpy(cmac->data, client_src_mac, 6); u1->length += sizeof(*cmac); } vss = dhcp_get_vss_info(dpm, rx_fib_idx, FIB_PROTOCOL_IP6); if (NULL != vss) { vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length); b0->current_length += (sizeof (*vss1)); vss1->opt.length =clib_host_to_net_u16(sizeof(*vss1) - sizeof(vss1->opt)); vss1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_VSS); vss1->data[0] = 1; // type vss1->data[1] = vss->oui >>16 & 0xff; vss1->data[2] = vss->oui >>8 & 0xff; vss1->data[3] = vss->oui & 0xff; vss1->data[4] = vss->fib_id >> 24 & 0xff; vss1->data[5] = vss->fib_id >> 16 & 0xff; vss1->data[6] = vss->fib_id >> 8 & 0xff; vss1->data[7] = vss->fib_id & 0xff; u1->length += sizeof(*vss1); } pkts_to_server++; u1->checksum = 0; u1->src_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_client); u1->dst_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_server); u1->length = clib_host_to_net_u16( clib_net_to_host_u16(fwd_opt->length) + sizeof(*r1) + sizeof(*fwd_opt) + sizeof(*u1) + sizeof(*id1) + u1->length); memset(ip1, 0, sizeof(*ip1)); ip1->ip_version_traffic_class_and_flow_label = 0x60; ip1->payload_length = u1->length; ip1->protocol = PROTO_UDP; ip1->hop_limit = HOP_COUNT_LIMIT; src = ((server->dhcp_server.ip6.as_u64[0] || server->dhcp_server.ip6.as_u64[1]) ? &server->dhcp_server.ip6 : &all_dhcpv6_server_address); copy_ip6_address(&ip1->dst_address, src); ia0 = ip6_interface_first_global_or_site_address (&ip6_main, vnet_buffer(b0)->sw_if_index[VLIB_RX]); src = (proxy->dhcp_src_address.ip6.as_u64[0] || proxy->dhcp_src_address.ip6.as_u64[1]) ? &proxy->dhcp_src_address.ip6 : ia0; if (ia0 == 0) { error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS; next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_src_address++; goto do_trace; } copy_ip6_address (&ip1->src_address, src); u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1, &bogus_length); ASSERT(bogus_length == 0); next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP; is_solicit = (DHCPV6_MSG_SOLICIT == h0->u.msg_type); /* * If we have multiple servers configured and this is the * client's discover message, then send copies to each of * those servers */ if (is_solicit && vec_len(proxy->dhcp_servers) > 1) { u32 ii; for (ii = 1; ii < vec_len(proxy->dhcp_servers); ii++) { vlib_buffer_t *c0; u32 ci0; c0 = vlib_buffer_copy(vm, b0); ci0 = vlib_get_buffer_index(vm, c0); server = &proxy->dhcp_servers[ii]; ip0 = vlib_buffer_get_current (c0); src = ((server->dhcp_server.ip6.as_u64[0] || server->dhcp_server.ip6.as_u64[1]) ? &server->dhcp_server.ip6 : &all_dhcpv6_server_address); copy_ip6_address(&ip1->dst_address, src); to_next[0] = ci0; to_next += 1; n_left_to_next -= 1; vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, ci0, next0); if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { dhcpv6_proxy_trace_t *tr; tr = vlib_add_trace (vm, node, c0, sizeof (*tr)); tr->which = 0; /* to server */ tr->error = error0; tr->original_sw_if_index = rx_sw_if_index; tr->sw_if_index = sw_if_index; if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP) copy_ip6_address((ip6_address_t *)&tr->packet_data[0], &server->dhcp_server.ip6); } if (PREDICT_FALSE(0 == n_left_to_next)) { vlib_put_next_frame (vm, node, next_index, n_left_to_next); vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); } } } do_trace: if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->which = 0; /* to server */ tr->error = error0; tr->original_sw_if_index = rx_sw_if_index; tr->sw_if_index = sw_if_index; if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0) copy_ip6_address((ip6_address_t *)&tr->packet_data[0], &server->dhcp_server.ip6); } do_enqueue: to_next[0] = bi0; to_next += 1; n_left_to_next -= 1; vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT, pkts_to_client); vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_RELAY_TO_SERVER, pkts_to_server); vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS, pkts_no_interface_address); vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE, pkts_wrong_msg_type); vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS, pkts_no_src_address); vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index, DHCPV6_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big); return from_frame->n_vectors; } VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = { .function = dhcpv6_proxy_to_server_input, .name = "dhcpv6-proxy-to-server", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = DHCPV6_PROXY_N_ERROR, .error_strings = dhcpv6_proxy_error_strings, .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n, foreach_dhcpv6_proxy_to_server_input_next #undef _ }, .format_buffer = format_dhcpv6_proxy_header_with_length, .format_trace = format_dhcpv6_proxy_trace, #if 0 .unformat_buffer = unformat_dhcpv6_proxy_header, #endif }; static uword dhcpv6_proxy_to_client_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, * from; ethernet_main_t *em = ethernet_get_main (vm); dhcp_proxy_main_t * dm = &dhcp_proxy_main; dhcp_proxy_t *proxy; dhcp_server_t *server; vnet_main_t * vnm = vnet_get_main(); int bogus_length; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; while (n_left_from > 0) { u32 bi0; vlib_buffer_t * b0; udp_header_t * u0, *u1=0; dhcpv6_relay_hdr_t * h0; ip6_header_t * ip1 = 0, *ip0; ip6_address_t _ia0, * ia0 = &_ia0; ip6_address_t client_address; ethernet_interface_t *ei0; ethernet_header_t *mac0; vnet_hw_interface_t *hi0; vlib_frame_t *f0; u32 * to_next0; u32 sw_if_index = ~0; u32 original_sw_if_index = ~0; vnet_sw_interface_t *si0; u32 error0 = (u32)~0; vnet_sw_interface_t *swif; dhcpv6_option_t *r0 = 0, *o; u16 len = 0; u8 interface_opt_flag = 0; u8 relay_msg_opt_flag = 0; ip6_main_t * im = &ip6_main; u32 server_fib_idx, client_fib_idx; bi0 = from[0]; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); h0 = vlib_buffer_get_current (b0); if (DHCPV6_MSG_RELAY_REPL != h0->msg_type) { error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE; drop_packet: vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index, error0, 1); f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index); to_next0 = vlib_frame_vector_args (f0); to_next0[0] = bi0; f0->n_vectors = 1; vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0); goto do_trace; } /* hop count seems not need to be checked */ if (HOP_COUNT_LIMIT < h0->hop_count) { error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS; goto drop_packet; } u0 = (void *)h0 -(sizeof(*u0)); ip0 = (void *)u0 -(sizeof(*ip0)); vlib_buffer_advance (b0, sizeof(*h0)); o = vlib_buffer_get_current (b0); /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID) _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there. Currently assuming no other options need to be processed The interface-ID is the FIB number we need to track down the client-facing interface */ while ((u8 *) o < (b0->data + b0->current_data + b0->current_length)) { if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16(o->option)) { interface_opt_flag = 1; if (clib_net_to_host_u16(o->length) == sizeof(sw_if_index)) sw_if_index = clib_net_to_host_u32(((dhcpv6_int_id_t*)o)->int_idx); if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index)) { error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION; goto drop_packet; } } if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16(o->option)) { relay_msg_opt_flag = 1; r0 = vlib_buffer_get_current (b0); } if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1)) break; vlib_buffer_advance (b0, sizeof(*o) + clib_net_to_host_u16(o->length)); o = (dhcpv6_option_t *) (((uword) o) + clib_net_to_host_u16(o->length) + sizeof(*o)); } if ((relay_msg_opt_flag == 0) || (r0 == 0)) { error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION; goto drop_packet; } if ((u32)~0 == sw_if_index) { error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION; goto drop_packet; } //Advance buffer to start of encapsulated DHCPv6 message vlib_buffer_advance (b0, sizeof(*r0)); client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index]; proxy = dhcp_get_proxy(dm, client_fib_idx, FIB_PROTOCOL_IP6); if (NULL == proxy) { error0 = DHCPV6_PROXY_ERROR_NO_SERVER; goto drop_packet; } server_fib_idx = im->fib_index_by_sw_if_index [vnet_buffer(b0)->sw_if_index[VLIB_RX]]; vec_foreach(server, proxy->dhcp_servers) { if (server_fib_idx == server->server_fib_index && ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] && ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1]) { goto server_found; } } //drop packet if not from server with configured address or FIB error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS; goto drop_packet; server_found: vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index = sw_if_index; swif = vnet_get_sw_interface (vnm, original_sw_if_index); if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) sw_if_index = swif->unnumbered_sw_if_index; /* * udp_local hands us the DHCPV6 header, need udp hdr, * ip hdr to relay to client */ vlib_buffer_advance (b0, -(sizeof(*u1))); u1 = vlib_buffer_get_current (b0); vlib_buffer_advance (b0, -(sizeof(*ip1))); ip1 = vlib_buffer_get_current (b0); copy_ip6_address(&client_address, &h0->peer_addr); ia0 = ip6_interface_first_address (&ip6_main, sw_if_index); if (ia0 == 0) { error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS; goto drop_packet; } len = clib_net_to_host_u16(r0->length); memset(ip1, 0, sizeof(*ip1)); copy_ip6_address(&ip1->dst_address, &client_address); u1->checksum = 0; u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server); u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client); u1->length = clib_host_to_net_u16 (len + sizeof(udp_header_t)); ip1->ip_version_traffic_class_and_flow_label = ip0->ip_version_traffic_class_and_flow_label & 0x00000fff; ip1->payload_length = u1->length; ip1->protocol = PROTO_UDP; ip1->hop_limit = HOP_COUNT_LIMIT; copy_ip6_address(&ip1->src_address, ia0); u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1, &bogus_length); ASSERT(bogus_length == 0); vlib_buffer_advance (b0, -(sizeof(ethernet_header_t))); si0 = vnet_get_sw_interface (vnm, original_sw_if_index); if (si0->type == VNET_SW_INTERFACE_TYPE_SUB) vlib_buffer_advance (b0, -4 /* space for VLAN tag */); mac0 = vlib_buffer_get_current (b0); hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index); ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance); clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address)); memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address)); mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ? clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x86dd); if (si0->type == VNET_SW_INTERFACE_TYPE_SUB) { u32 * vlan_tag = (u32 *)(mac0+1); u32 tmp; tmp = (si0->sub.id << 16) | 0x0800; *vlan_tag = clib_host_to_net_u32 (tmp); } /* $$$ consider adding a dynamic next to the graph node, for performance */ f0 = vlib_get_frame_to_node (vm, hi0->output_node_index); to_next0 = vlib_frame_vector_args (f0); to_next0[0] = bi0; f0->n_vectors = 1; vlib_put_frame_to_node (vm, hi0->output_node_index, f0); do_trace: if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->which = 1; /* to client */ if (ia0) copy_ip6_address((ip6_address_t*)tr->packet_data, ia0); tr->error = error0; tr->original_sw_if_index = original_sw_if_index; tr->sw_if_index = sw_if_index; } } return from_frame->n_vectors; } VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = { .function = dhcpv6_proxy_to_client_input, .name = "dhcpv6-proxy-to-client", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = DHCPV6_PROXY_N_ERROR, .error_strings = dhcpv6_proxy_error_strings, .format_buffer = format_dhcpv6_proxy_header_with_length, .format_trace = format_dhcpv6_proxy_trace, #if 0 .unformat_buffer = unformat_dhcpv6_proxy_header, #endif }; static clib_error_t * dhcp6_proxy_init (vlib_main_t * vm) { dhcp_proxy_main_t * dm = &dhcp_proxy_main; vlib_node_t * error_drop_node; error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop"); dm->error_drop_node_index = error_drop_node->index; /* RFC says this is the dhcpv6 server address */ all_dhcpv6_server_address.as_u64[0] = clib_host_to_net_u64 (0xFF05000000000000); all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003); /* RFC says this is the server and agent address */ all_dhcpv6_server_relay_agent_address.as_u64[0] = clib_host_to_net_u64 (0xFF02000000000000); all_dhcpv6_server_relay_agent_address.as_u64[1] = clib_host_to_net_u64 (0x00010002); udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client, dhcpv6_proxy_to_client_node.index, 0 /* is_ip6 */); udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server, dhcpv6_proxy_to_server_node.index, 0 /* is_ip6 */); return 0; } VLIB_INIT_FUNCTION (dhcp6_proxy_init); int dhcp6_proxy_set_server (ip46_address_t *addr, ip46_address_t *src_addr, u32 rx_table_id, u32 server_table_id, int is_del) { u32 rx_fib_index = 0; int rc = 0; const mfib_prefix_t all_dhcp_servers = { .fp_len = 128, .fp_proto = FIB_PROTOCOL_IP6, .fp_grp_addr = { .ip6 = all_dhcpv6_server_relay_agent_address, } }; if (ip46_address_is_zero(addr)) return VNET_API_ERROR_INVALID_DST_ADDRESS; if (ip46_address_is_zero(src_addr)) return VNET_API_ERROR_INVALID_SRC_ADDRESS; rx_fib_index = mfib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6, rx_table_id); if (is_del) { if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index, addr, server_table_id)) { mfib_table_entry_delete(rx_fib_index, &all_dhcp_servers, MFIB_SOURCE_DHCP); mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6); } } else { const fib_route_path_t path_for_us = { .frp_proto = FIB_PROTOCOL_IP6, .frp_addr = zero_addr, .frp_sw_if_index = 0xffffffff, .frp_fib_index = ~0, .frp_weight = 0, .frp_flags = FIB_ROUTE_PATH_LOCAL, }; if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr, rx_fib_index, server_table_id)) { mfib_table_entry_path_update(rx_fib_index, &all_dhcp_servers, MFIB_SOURCE_DHCP, &path_for_us, MFIB_ITF_FLAG_FORWARD); /* * Each interface that is enabled in this table, needs to be added * as an accepting interface, but this is not easily doable in VPP. * So we cheat. Add a flag to the entry that indicates accept form * any interface. * We will still only accept on v6 enabled interfaces, since the * input feature ensures this. */ mfib_table_entry_update(rx_fib_index, &all_dhcp_servers, MFIB_SOURCE_DHCP, MFIB_RPF_ID_NONE, MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF); mfib_table_lock(rx_fib_index, FIB_PROTOCOL_IP6); } } mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6); return (rc); } static clib_error_t * dhcpv6_proxy_set_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { ip46_address_t addr, src_addr; int set_server = 0, set_src_address = 0; u32 rx_table_id = 0, server_table_id = 0; int is_del = 0; while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "server %U", unformat_ip6_address, &addr.ip6)) set_server = 1; else if (unformat(input, "src-address %U", unformat_ip6_address, &src_addr.ip6)) set_src_address =1; else if (unformat (input, "server-fib-id %d", &server_table_id)) ; else if (unformat (input, "rx-fib-id %d", &rx_table_id)) ; else if (unformat (input, "delete") || unformat (input, "del")) is_del = 1; else break; } if (is_del || (set_server && set_src_address)) { int rv; rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id, server_table_id, is_del); //TODO: Complete the errors switch (rv) { case 0: return 0; case VNET_API_ERROR_INVALID_DST_ADDRESS: return clib_error_return (0, "Invalid server address"); case VNET_API_ERROR_INVALID_SRC_ADDRESS: return clib_error_return (0, "Invalid src address"); case VNET_API_ERROR_NO_SUCH_ENTRY: return clib_error_return (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id); default: return clib_error_return (0, "BUG: rv %d", rv); } } else return clib_error_return (0, "parse error`%U'", format_unformat_error, input); } VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = { .path = "set dhcpv6 proxy", .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> " "[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ", .function = dhcpv6_proxy_set_command_fn, }; static u8 * format_dhcp6_proxy_server (u8 * s, va_list * args) { dhcp_proxy_t * proxy = va_arg (*args, dhcp_proxy_t *); fib_table_t *server_fib; dhcp_server_t *server; ip6_mfib_t *rx_fib; if (proxy == 0) { s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address", "Servers FIB,Address"); return s; } rx_fib = ip6_mfib_get(proxy->rx_fib_index); s = format (s, "%=14u%=16U", rx_fib->table_id, format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY); vec_foreach(server, proxy->dhcp_servers) { server_fib = fib_table_get(server->server_fib_index, FIB_PROTOCOL_IP6); s = format (s, "%u,%U ", server_fib->ft_table_id, format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY); } return s; } static int dhcp6_proxy_show_walk (dhcp_proxy_t *proxy, void *ctx) { vlib_main_t * vm = ctx; vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy); return (1); } static clib_error_t * dhcpv6_proxy_show_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, NULL /* header line */); dhcp_proxy_walk(FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm); return (NULL); } VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = { .path = "show dhcpv6 proxy", .short_help = "Display dhcpv6 proxy info", .function = dhcpv6_proxy_show_command_fn, }; static clib_error_t * dhcpv6_vss_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { int is_del = 0, got_new_vss=0; u32 oui=0; u32 fib_id=0, tbl_id=~0; while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "oui %d", &oui)) got_new_vss = 1; else if (unformat (input, "vpn-id %d", &fib_id)) got_new_vss = 1; else if (unformat (input, "table %d", &tbl_id)) got_new_vss = 1; else if (unformat(input, "delete") || unformat(input, "del")) is_del = 1; else break; } if (tbl_id ==~0) return clib_error_return (0, "no table ID specified."); if (is_del || got_new_vss) { int rv; rv = dhcp_proxy_set_vss(FIB_PROTOCOL_IP6, tbl_id, oui, fib_id, is_del); switch (rv) { case 0: return 0; case VNET_API_ERROR_NO_SUCH_FIB: return clib_error_return (0, "vss info (oui:%d, vpn-id:%d) not found in table %d.", oui, fib_id, tbl_id); case VNET_API_ERROR_NO_SUCH_ENTRY: return clib_error_return (0, "vss for table %d not found in pool.", tbl_id); default: return clib_error_return (0, "BUG: rv %d", rv); } } else return clib_error_return (0, "parse error`%U'", format_unformat_error, input); } VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = { .path = "set dhcpv6 vss", .short_help = "set dhcpv6 vss table <table-id> oui <oui> vpn-idx <vpn-idx>", .function = dhcpv6_vss_command_fn, }; static clib_error_t * dhcpv6_vss_show_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { dhcp_vss_walk(FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm); return (NULL); } VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = { .path = "show dhcpv6 vss", .short_help = "show dhcpv6 VSS", .function = dhcpv6_vss_show_command_fn, }; static clib_error_t * dhcpv6_link_address_show_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main(); u32 sw_if_index0=0, sw_if_index; vnet_sw_interface_t *swif; ip6_address_t *ia0; while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) { if (unformat(input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index0)) { swif = vnet_get_sw_interface (vnm, sw_if_index0); sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ? swif->unnumbered_sw_if_index : sw_if_index0; ia0 = ip6_interface_first_address(&ip6_main, sw_if_index); if (ia0) { vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address"); vlib_cli_output (vm, "%=20U%=48U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip6_address, ia0); } else vlib_cli_output (vm, "%=34s%=20U", "No IPv6 address configured on", format_vnet_sw_if_index_name, vnm, sw_if_index); } else break; } return 0; } VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = { .path = "show dhcpv6 link-address interface", .short_help = "show dhcpv6 link-address interface <interface>", .function = dhcpv6_link_address_show_command_fn, };