diff options
Diffstat (limited to 'src/plugins/dhcp/dhcp6_proxy_node.c')
| -rw-r--r-- | src/plugins/dhcp/dhcp6_proxy_node.c | 1186 |
1 files changed, 1186 insertions, 0 deletions
diff --git a/src/plugins/dhcp/dhcp6_proxy_node.c b/src/plugins/dhcp/dhcp6_proxy_node.c new file mode 100644 index 00000000000..929b49e2b41 --- /dev/null +++ b/src/plugins/dhcp/dhcp6_proxy_node.c @@ -0,0 +1,1186 @@ +/* + * 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 <dhcp/dhcp_proxy.h> +#include <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 <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; + + /* *INDENT-OFF* */ + 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; + } + })); + /* *INDENT-ON* */ + 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]; + 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->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->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->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: + + if ((b0->current_length + sizeof (*id1) + sizeof (*vss1) + + sizeof (*cmac)) > vlib_buffer_get_default_data_size (vm)) + { + 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->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 (vss) + { + u16 id_len; /* length of VPN ID */ + u16 type_len = sizeof (vss1->vss_type); + + vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length); + vss1->vss_type = vss->vss_type; + if (vss->vss_type == VSS_TYPE_VPN_ID) + { + id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */ + memcpy (vss1->data, vss->vpn_id, id_len); + } + else if (vss->vss_type == VSS_TYPE_ASCII) + { + id_len = vec_len (vss->vpn_ascii_id); + memcpy (vss1->data, vss->vpn_ascii_id, id_len); + } + else /* must be VSS_TYPE_DEFAULT, no VPN ID */ + id_len = 0; + + vss1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_VSS); + vss1->opt.length = clib_host_to_net_u16 (type_len + id_len); + u1->length += type_len + id_len + sizeof (vss1->opt); + b0->current_length += type_len + id_len + sizeof (vss1->opt); + } + + 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); + + clib_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->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); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0); + 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; +} + +/* *INDENT-OFF* */ +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 +}; +/* *INDENT-ON* */ + +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 = vnet_get_ethernet_main (); + 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); + clib_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)); + clib_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; + +} + +/* *INDENT-OFF* */ +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 +}; +/* *INDENT-ON* */ + +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); + + 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) +{ + vlib_main_t *vm = vlib_get_main (); + 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, + MFIB_SOURCE_DHCP); + + 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, + MFIB_SOURCE_DHCP); + + udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client, + 0 /* is_ip6 */ ); + udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server, + 0 /* is_ip6 */ ); + } + } + else + { + const fib_route_path_t path_for_us = { + .frp_proto = DPO_PROTO_IP6, + .frp_addr = zero_addr, + .frp_sw_if_index = 0xffffffff, + .frp_fib_index = ~0, + .frp_weight = 1, + .frp_flags = FIB_ROUTE_PATH_LOCAL, + .frp_mitf_flags = MFIB_ITF_FLAG_FORWARD, + }; + 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); + /* + * 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_SOURCE_DHCP); + + 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 */ ); + } + } + + mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP); + + 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); +} + +/* *INDENT-OFF* */ +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, +}; +/* *INDENT-ON* */ + +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); +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = { + .path = "show dhcpv6 proxy", + .short_help = "Display dhcpv6 proxy info", + .function = dhcpv6_proxy_show_command_fn, +}; +/* *INDENT-ON* */ + +static clib_error_t * +dhcpv6_vss_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT; + u8 *vpn_ascii_id = 0; + u32 oui = 0, fib_id = 0, tbl_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_IP6, 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, "vss for table %d not found in pool.", + tbl_id); + default: + return clib_error_return (0, "BUG: rv %d", rv); + } +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = { + .path = "set dhcpv6 vss", + .short_help = "set dhcpv6 vss table <table-id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]", + .function = dhcpv6_vss_command_fn, +}; +/* *INDENT-ON* */ + +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); +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = { + .path = "show dhcpv6 vss", + .short_help = "show dhcpv6 VSS", + .function = dhcpv6_vss_show_command_fn, +}; +/* *INDENT-ON* */ + +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; +} + +/* *INDENT-OFF* */ +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, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |