/* * proxy_node.c: dhcp 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 <dhcp/dhcp_proxy.h> #include <dhcp/client.h> #include <vnet/fib/ip4_fib.h> static char *dhcp_proxy_error_strings[] = { #define dhcp_proxy_error(n,s) s, #include <dhcp/dhcp4_proxy_error.def> #undef dhcp_proxy_error }; #define foreach_dhcp_proxy_to_server_input_next \ _ (DROP, "error-drop") \ _ (LOOKUP, "ip4-lookup") \ _ (SEND_TO_CLIENT, "dhcp-proxy-to-client") typedef enum { #define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s, foreach_dhcp_proxy_to_server_input_next #undef _ DHCP_PROXY_TO_SERVER_INPUT_N_NEXT, } dhcp_proxy_to_server_input_next_t; typedef struct { /* 0 => to server, 1 => to client */ int which; ip4_address_t trace_ip4_address; u32 error; u32 sw_if_index; u32 original_sw_if_index; /* enough space for the DHCP header plus some options */ u8 packet_data[2 * sizeof (dhcp_header_t)]; } dhcp_proxy_trace_t; #define VPP_DHCP_OPTION82_SUB1_SIZE 6 #define VPP_DHCP_OPTION82_SUB5_SIZE 6 #define VPP_DHCP_OPTION82_VSS_SIZE 12 #define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \ VPP_DHCP_OPTION82_SUB5_SIZE + \ VPP_DHCP_OPTION82_VSS_SIZE +3) static vlib_node_registration_t dhcp_proxy_to_server_node; static vlib_node_registration_t dhcp_proxy_to_client_node; static u8 * format_dhcp_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 *); dhcp_proxy_trace_t *t = va_arg (*args, dhcp_proxy_trace_t *); if (t->which == 0) s = format (s, "DHCP proxy: sent to server %U\n", format_ip4_address, &t->trace_ip4_address, t->error); else s = format (s, "DHCP proxy: broadcast to client from %U\n", format_ip4_address, &t->trace_ip4_address); if (t->error != (u32) ~ 0) s = format (s, " error: %s\n", dhcp_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); s = format (s, " %U", format_dhcp_header, t->packet_data, sizeof (t->packet_data)); return s; } static u8 * format_dhcp_proxy_header_with_length (u8 * s, va_list * args) { dhcp_header_t *h = va_arg (*args, dhcp_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, "dhcp header truncated"); s = format (s, "DHCP Proxy"); return s; } static uword dhcp_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; u32 pkts_too_big = 0; ip4_main_t *im = &ip4_main; 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) { u32 bi0; vlib_buffer_t *b0; udp_header_t *u0; dhcp_header_t *h0; ip4_header_t *ip0; u32 next0; u32 old0, new0; ip_csum_t sum0; u32 error0 = (u32) ~ 0; u32 sw_if_index = 0; u32 original_sw_if_index = 0; u32 fib_index; dhcp_proxy_t *proxy; dhcp_server_t *server; u32 rx_sw_if_index; dhcp_option_t *o, *end; u32 len = 0; u8 is_discover = 0; int space_left; 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 DHCP header, need udp hdr, * ip hdr to relay to server */ vlib_buffer_advance (b0, -(sizeof (*u0))); u0 = vlib_buffer_get_current (b0); /* This blows. Return traffic has src_port = 67, dst_port = 67 */ if (u0->src_port == clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_server)) { vlib_buffer_advance (b0, sizeof (*u0)); next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT; error0 = 0; pkts_to_client++; goto do_enqueue; } rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; fib_index = im->fib_index_by_sw_if_index[rx_sw_if_index]; proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4); if (PREDICT_FALSE (NULL == proxy)) { error0 = DHCP_PROXY_ERROR_NO_SERVER; next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_server++; goto do_trace; } if (!vlib_buffer_chain_linearize (vm, b0)) { error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG; next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_too_big++; goto do_trace; } space_left = vlib_buffer_space_left_at_end (vm, b0); /* cant parse chains... * and we need some space for option 82*/ if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || space_left < VPP_DHCP_OPTION82_SIZE) { error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG; next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_too_big++; goto do_trace; } server = &proxy->dhcp_servers[0]; vlib_buffer_advance (b0, -(sizeof (*ip0))); ip0 = vlib_buffer_get_current (b0); /* disable UDP checksum */ u0->checksum = 0; sum0 = ip0->checksum; old0 = ip0->dst_address.as_u32; new0 = server->dhcp_server.ip4.as_u32; ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32; sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ , dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); sum0 = ip0->checksum; old0 = ip0->src_address.as_u32; new0 = proxy->dhcp_src_address.ip4.as_u32; ip0->src_address.as_u32 = new0; sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ , src_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); /* Send to DHCP server via the configured FIB */ vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index; h0->gateway_ip_address = proxy->dhcp_src_address.ip4; pkts_to_server++; o = h0->options; end = (void *) vlib_buffer_get_tail (b0); /* TLVs are not performance-friendly... */ while (o->option != DHCP_PACKET_OPTION_END && o < end) { if (DHCP_PACKET_OPTION_MSG_TYPE == o->option) { if (DHCP_PACKET_DISCOVER == o->data[0]) { is_discover = 1; } } o = (dhcp_option_t *) (o->data + o->length); } if (o->option == DHCP_PACKET_OPTION_END && o <= end) { vnet_main_t *vnm = vnet_get_main (); u16 old_l0, new_l0; ip4_address_t _ia0, *ia0 = &_ia0; dhcp_vss_t *vss; vnet_sw_interface_t *swif; original_sw_if_index = sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; swif = vnet_get_sw_interface (vnm, sw_if_index); if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) sw_if_index = swif->unnumbered_sw_if_index; /* * Get the first ip4 address on the [client-side] * RX interface, if not unnumbered. otherwise use * the loopback interface's ip address. */ ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0); if (ia0 == 0) { error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS; next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP; pkts_no_interface_address++; goto do_trace; } /* Add option 82 */ o->option = 82; /* option 82 */ o->length = 12; /* 12 octets to follow */ o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */ o->data[1] = 4; /* length of suboption */ u32 *o_ifid = (u32 *) & o->data[2]; *o_ifid = clib_host_to_net_u32 (original_sw_if_index); o->data[6] = 5; /* suboption 5 (client RX intfc address) */ o->data[7] = 4; /* length 4 */ u32 *o_addr = (u32 *) & o->data[8]; *o_addr = ia0->as_u32; o->data[12] = DHCP_PACKET_OPTION_END; vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4); if (vss) { u32 id_len; /* length of VPN ID */ if (vss->vss_type == VSS_TYPE_VPN_ID) { id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */ memcpy (&o->data[15], vss->vpn_id, id_len); } else if (vss->vss_type == VSS_TYPE_ASCII) { id_len = vec_len (vss->vpn_ascii_id); memcpy (&o->data[15], vss->vpn_ascii_id, id_len); } else /* must be VSS_TYPE_DEFAULT, no VPN ID */ id_len = 0; o->data[12] = 151; /* vss suboption */ o->data[13] = id_len + 1; /* length: vss_type + id_len */ o->data[14] = vss->vss_type; /* vss option type */ o->data[15 + id_len] = 152; /* vss control suboption */ o->data[16 + id_len] = 0; /* length */ o->data[17 + id_len] = DHCP_PACKET_OPTION_END; /* "end-of-options" (0xFF) */ /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */ o->length += id_len + 5; } len = o->length + 3; b0->current_length += len; /* Fix IP header length and checksum */ old_l0 = ip0->length; new_l0 = clib_net_to_host_u16 (old_l0); new_l0 += len; new_l0 = clib_host_to_net_u16 (new_l0); ip0->length = new_l0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t, length /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); /* Fix UDP length */ new_l0 = clib_net_to_host_u16 (u0->length); new_l0 += len; u0->length = clib_host_to_net_u16 (new_l0); } else { vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_OPTION_82_ERROR, 1); } next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP; /* * If we have multiple servers configured and this is the * client's discover message, then send copies to each of * those servers */ if (is_discover && 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); if (c0 == NULL) { vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_ALLOC_FAIL, 1); continue; } ci0 = vlib_get_buffer_index (vm, c0); server = &proxy->dhcp_servers[ii]; ip0 = vlib_buffer_get_current (c0); sum0 = ip0->checksum; old0 = ip0->dst_address.as_u32; new0 = server->dhcp_server.ip4.as_u32; ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32; sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ , dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); 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)) { dhcp_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 = original_sw_if_index; tr->sw_if_index = sw_if_index; if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP) tr->trace_ip4_address.as_u32 = server->dhcp_server.ip4.as_u32; clib_memcpy_fast (tr->packet_data, h0, sizeof (tr->packet_data)); } 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)) { dhcp_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 = original_sw_if_index; tr->sw_if_index = sw_if_index; if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP) tr->trace_ip4_address.as_u32 = proxy->dhcp_servers[0].dhcp_server.ip4.as_u32; clib_memcpy_fast (tr->packet_data, h0, sizeof (tr->packet_data)); } 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, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_RELAY_TO_CLIENT, pkts_to_client); vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_RELAY_TO_SERVER, pkts_to_server); vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server); vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS, pkts_no_interface_address); vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index, DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big); return from_frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = { .function = dhcp_proxy_to_server_input, .name = "dhcp-proxy-to-server", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = DHCP_PROXY_N_ERROR, .error_strings = dhcp_proxy_error_strings, .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n, foreach_dhcp_proxy_to_server_input_next #undef _ }, .format_buffer = format_dhcp_proxy_header_with_length, .format_trace = format_dhcp_proxy_trace, #if 0 .unformat_buffer = unformat_dhcp_proxy_header, #endif }; /* *INDENT-ON* */ typedef enum { DHCP4_PROXY_NEXT_DROP, DHCP4_PROXY_NEXT_TX, DHCP4_PROXY_N_NEXT, } dhcp4_next_t; static uword dhcp_proxy_to_client_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, *from, *to_next, n_left_to_next; ethernet_main_t *em = vnet_get_ethernet_main (); dhcp_proxy_main_t *dpm = &dhcp_proxy_main; vnet_main_t *vnm = vnet_get_main (); ip4_main_t *im = &ip4_main; u32 next_index; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; udp_header_t *u0; dhcp_header_t *h0; ip4_header_t *ip0 = 0; ip4_address_t *ia0 = 0; u32 old0, new0; ip_csum_t sum0; ethernet_interface_t *ei0; ethernet_header_t *mac0; vnet_hw_interface_t *hi0; u32 sw_if_index = ~0; vnet_sw_interface_t *si0; u32 inner_vlan = (u32) ~ 0; u32 outer_vlan = (u32) ~ 0; u32 error0 = (u32) ~ 0; vnet_sw_interface_t *swif; u32 fib_index; dhcp_proxy_t *proxy; dhcp_server_t *server; u32 original_sw_if_index = (u32) ~ 0; dhcp4_next_t next0 = DHCP4_PROXY_NEXT_TX; ip4_address_t relay_addr = { .as_u32 = 0, }; bi0 = to_next[0] = from[0]; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); h0 = vlib_buffer_get_current (b0); /* * udp_local hands us the DHCP header, need udp hdr, * ip hdr to relay to client */ vlib_buffer_advance (b0, -(sizeof (*u0))); u0 = vlib_buffer_get_current (b0); vlib_buffer_advance (b0, -(sizeof (*ip0))); ip0 = vlib_buffer_get_current (b0); /* Consumed by dhcp client code? */ if (dhcp_client_for_us (bi0, b0, ip0, u0, h0)) { error0 = DHCP_PROXY_ERROR_FOR_US; goto drop_packet; } // if (1 /* dpm->insert_option_82 */ ) /* linearize needed to "unclone" and scan options */ int rv = vlib_buffer_chain_linearize (vm, b0); if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || !rv) { error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG; goto drop_packet; } dhcp_option_t *o = h0->options, *end = (void *) vlib_buffer_get_tail (b0); /* Parse through TLVs looking for option 82. The circuit-ID is the FIB number we need to track down the client-facing interface */ while (o->option != DHCP_PACKET_OPTION_END && o < end) { if (o->option == 82) { u32 vss_exist = 0; u32 vss_ctrl = 0; dhcp_option_t *sub = (dhcp_option_t *) & o->data[0]; dhcp_option_t *subend = (dhcp_option_t *) (o->data + o->length); while (sub->option != DHCP_PACKET_OPTION_END && sub < subend) { /* If this is one of ours, it will have total length 12, circuit-id suboption type, and the sw_if_index */ if (sub->option == 1 && sub->length == 4) { sw_if_index = ((sub->data[0] << 24) | (sub->data[1] << 16) | (sub->data[2] << 8) | (sub->data[3])); } else if (sub->option == 5 && sub->length == 4) { relay_addr.as_u8[0] = sub->data[0]; relay_addr.as_u8[1] = sub->data[1]; relay_addr.as_u8[2] = sub->data[2]; relay_addr.as_u8[3] = sub->data[3]; } else if (sub->option == 151 && sub->length == 7 && sub->data[0] == 1) vss_exist = 1; else if (sub->option == 152 && sub->length == 0) vss_ctrl = 1; sub = (dhcp_option_t *) (sub->data + sub->length); } if (vss_ctrl && vss_exist) vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index, DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1); } o = (dhcp_option_t *) (o->data + o->length); } if (sw_if_index == (u32) ~ 0) { error0 = DHCP_PROXY_ERROR_NO_OPTION_82; drop_packet: vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index, error0, 1); b0->error = node->errors[error0]; next0 = DHCP4_PROXY_NEXT_DROP; goto do_trace; } if (relay_addr.as_u32 == 0) { error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR; goto drop_packet; } if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index)) { error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF; goto drop_packet; } fib_index = im->fib_index_by_sw_if_index[sw_if_index]; proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4); if (PREDICT_FALSE (NULL == proxy)) { error0 = DHCP_PROXY_ERROR_NO_SERVER; goto drop_packet; } vec_foreach (server, proxy->dhcp_servers) { if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32) { goto server_found; } } error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS; goto drop_packet; server_found: vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index; swif = vnet_get_sw_interface (vnm, sw_if_index); original_sw_if_index = sw_if_index; if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) sw_if_index = swif->unnumbered_sw_if_index; ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0); if (ia0 == 0) { error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS; goto drop_packet; } if (relay_addr.as_u32 != ia0->as_u32) { error0 = DHCP_PROXY_ERROR_BAD_YIADDR; goto drop_packet; } u0->checksum = 0; u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client); sum0 = ip0->checksum; old0 = ip0->dst_address.as_u32; new0 = 0xFFFFFFFF; ip0->dst_address.as_u32 = new0; sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ , dst_address /* offset of changed member */ ); ip0->checksum = ip_csum_fold (sum0); sum0 = ip0->checksum; old0 = ip0->src_address.as_u32; new0 = ia0->as_u32; ip0->src_address.as_u32 = new0; sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ , src_address /* offset of changed member */ ); ip0->checksum = ip_csum_fold (sum0); 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) { if (si0->sub.eth.flags.one_tag == 1) { vlib_buffer_advance (b0, -4 /* space for 1 VLAN tag */ ); outer_vlan = (si0->sub.eth.outer_vlan_id << 16) | 0x0800; } else if (si0->sub.eth.flags.two_tags == 1) { vlib_buffer_advance (b0, -8 /* space for 2 VLAN tag */ ); outer_vlan = (si0->sub.eth.outer_vlan_id << 16) | 0x8100; inner_vlan = (si0->sub.eth.inner_vlan_id << 16) | 0x0800; } } 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 (mac0->src_address)); clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address)); if (si0->type == VNET_SW_INTERFACE_TYPE_SUB && outer_vlan != (u32) ~ 0) { mac0->type = (si0->sub.eth.flags.dot1ad == 1) ? clib_net_to_host_u16 (0x88a8) : clib_net_to_host_u16 (0x8100); u32 *vlan_tag = (u32 *) (mac0 + 1); *vlan_tag = clib_host_to_net_u32 (outer_vlan); if (inner_vlan != (u32) ~ 0) { u32 *inner_vlan_tag = (u32 *) (vlan_tag + 1); *inner_vlan_tag = clib_host_to_net_u32 (inner_vlan); } } else { mac0->type = clib_net_to_host_u16 (0x0800); } do_trace: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->which = 1; /* to client */ tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0; tr->error = error0; tr->original_sw_if_index = original_sw_if_index; tr->sw_if_index = sw_if_index; clib_memcpy_fast (tr->packet_data, h0, sizeof (tr->packet_data)); } 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); } return from_frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = { .function = dhcp_proxy_to_client_input, .name = "dhcp-proxy-to-client", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = DHCP_PROXY_N_ERROR, .error_strings = dhcp_proxy_error_strings, .format_buffer = format_dhcp_proxy_header_with_length, .format_trace = format_dhcp_proxy_trace, #if 0 .unformat_buffer = unformat_dhcp_proxy_header, #endif .n_next_nodes = DHCP4_PROXY_N_NEXT, .next_nodes = { [DHCP4_PROXY_NEXT_DROP] = "error-drop", [DHCP4_PROXY_NEXT_TX] = "interface-output", }, }; /* *INDENT-ON* */ void dhcp_maybe_register_udp_ports (dhcp_port_reg_flags_t ports) { dhcp_proxy_main_t *dm = &dhcp_proxy_main; vlib_main_t *vm = dm->vlib_main; int port_regs_diff = dm->udp_ports_registered ^ ports; if (!port_regs_diff) return; if ((port_regs_diff & DHCP_PORT_REG_CLIENT) & ports) udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client, dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ ); if ((port_regs_diff & DHCP_PORT_REG_SERVER) & ports) udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server, dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ ); dm->udp_ports_registered |= ports; } static clib_error_t * dhcp4_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; dm->vlib_main = vm; return 0; } VLIB_INIT_FUNCTION (dhcp4_proxy_init); int dhcp4_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 fib_prefix_t all_1s = { .fp_len = 32, .fp_addr.ip4.as_u32 = 0xffffffff, .fp_proto = FIB_PROTOCOL_IP4, }; 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; dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT | DHCP_PORT_REG_SERVER); rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, rx_table_id, FIB_SOURCE_DHCP); if (is_del) { if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index, addr, server_table_id)) { fib_table_entry_special_remove (rx_fib_index, &all_1s, FIB_SOURCE_DHCP); fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP); } } else { if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4, addr, src_addr, rx_fib_index, server_table_id)) { fib_table_entry_special_add (rx_fib_index, &all_1s, FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL); fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP); } } fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP); return (rc); } static clib_error_t * dhcp4_proxy_set_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { ip46_address_t server_addr, src_addr; u32 server_table_id = 0, rx_table_id = 0; int is_del = 0; int set_src = 0, set_server = 0; clib_memset (&server_addr, 0, sizeof (server_addr)); clib_memset (&src_addr, 0, sizeof (src_addr)); while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "server %U", unformat_ip4_address, &server_addr.ip4)) set_server = 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, "src-address %U", unformat_ip4_address, &src_addr.ip4)) set_src = 1; else if (unformat (input, "delete") || unformat (input, "del")) is_del = 1; else break; } if (is_del || (set_server && set_src)) { int rv; rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id, server_table_id, is_del); 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); } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = { .path = "set dhcp proxy", .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]", .function = dhcp4_proxy_set_command_fn, }; /* *INDENT-ON* */ static u8 * format_dhcp4_proxy_server (u8 * s, va_list * args) { dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *); ip4_fib_t *rx_fib, *server_fib; dhcp_server_t *server; if (proxy == 0) { s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address", "Servers FIB,Address"); return s; } rx_fib = ip4_fib_get (proxy->rx_fib_index); s = format (s, "%=14u%=16U", rx_fib->hash.table_id, format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY); vec_foreach (server, proxy->dhcp_servers) { server_fib = ip4_fib_get (server->server_fib_index); s = format (s, "%u,%U ", server_fib->hash.table_id, format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY); } return s; } static int dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx) { vlib_main_t *vm = ctx; vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server); return (1); } static clib_error_t * dhcp4_proxy_show_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, NULL /* header line */ ); dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm); return (NULL); } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = { .path = "show dhcp proxy", .short_help = "Display dhcp proxy server info", .function = dhcp4_proxy_show_command_fn, }; /* *INDENT-ON* */ static clib_error_t * dhcp_option_82_vss_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT; u32 oui = 0, fib_id = 0, tbl_id = ~0; u8 *vpn_ascii_id = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "table %d", &tbl_id)) ; else if (unformat (input, "oui %d", &oui)) vss_type = VSS_TYPE_VPN_ID; else if (unformat (input, "vpn-id %d", &fib_id)) vss_type = VSS_TYPE_VPN_ID; else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id)) vss_type = VSS_TYPE_ASCII; 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."); int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type, vpn_ascii_id, oui, fib_id, is_del); switch (rv) { case 0: return 0; case VNET_API_ERROR_NO_SUCH_ENTRY: return clib_error_return (0, "option 82 vss for table %d not found in in pool.", tbl_id); default: return clib_error_return (0, "BUG: rv %d", rv); } } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = { .path = "set dhcp option-82 vss", .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]", .function = dhcp_option_82_vss_fn, }; /* *INDENT-ON* */ static clib_error_t * dhcp_vss_show_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm); return (NULL); } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = { .path = "show dhcp vss", .short_help = "show dhcp VSS", .function = dhcp_vss_show_command_fn, }; /* *INDENT-ON* */ static clib_error_t * dhcp_option_82_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; ip4_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 = ip4_interface_first_address (&ip4_main, sw_if_index, 0); if (ia0) { vlib_cli_output (vm, "%=20s%=20s", "interface", "source IP address"); vlib_cli_output (vm, "%=20U%=20U", format_vnet_sw_if_index_name, vnm, sw_if_index0, format_ip4_address, ia0); } else vlib_cli_output (vm, "%=34s %=20U", "No IPv4 address configured on", format_vnet_sw_if_index_name, vnm, sw_if_index); } else break; } return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = { .path = "show dhcp option-82-address interface", .short_help = "show dhcp option-82-address interface <interface>", .function = dhcp_option_82_address_show_command_fn, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */