diff options
Diffstat (limited to 'vpp/vnet/vnet/dhcpv6/proxy_node.c')
| -rw-r--r-- | vpp/vnet/vnet/dhcpv6/proxy_node.c | 1195 |
1 files changed, 1195 insertions, 0 deletions
diff --git a/vpp/vnet/vnet/dhcpv6/proxy_node.c b/vpp/vnet/vnet/dhcpv6/proxy_node.c new file mode 100644 index 00000000..4dd2239f --- /dev/null +++ b/vpp/vnet/vnet/dhcpv6/proxy_node.c @@ -0,0 +1,1195 @@ +/* + * 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/dhcpv6/proxy.h> +#include <vnet/fib/ip6_fib.h> + +static char * dhcpv6_proxy_error_strings[] = { +#define dhcpv6_proxy_error(n,s) s, +#include "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; + +vlib_node_registration_t dhcpv6_proxy_to_server_node; +vlib_node_registration_t dhcpv6_proxy_to_client_node; + + +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; +} + +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; +} + +/* get first interface address */ +static ip6_address_t * +ip6_interface_first_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); + 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; + dhcpv6_proxy_main_t * dpm = &dhcpv6_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_fib_t * fib; + ip6_address_t * src; + int bogus_length; + dhcpv6_server_t * server; + u32 rx_fib_idx = 0, server_fib_idx = 0; + u32 server_idx; + u32 fib_id1 = 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; + + uword *p_vss; + u32 oui1=0; + dhcpv6_vss_info *vss; + + + bi0 = from[0]; + to_next[0] = bi0; + 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 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->fib_index_by_sw_if_index [rx_sw_if_index]; + + if (vec_len(dpm->dhcp6_server_index_by_rx_fib_index) <= rx_fib_idx) + goto no_server; + + server_idx = dpm->dhcp6_server_index_by_rx_fib_index[rx_fib_idx]; + + if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp6_servers, + server_idx))) + { + no_server: + error0 = DHCPV6_PROXY_ERROR_NO_SERVER; + next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP; + pkts_no_server++; + goto do_trace; + } + + server = pool_elt_at_index(dpm->dhcp6_servers, server_idx); + if (server->valid == 0) + goto no_server; + + server_fib_idx = server->server_fib6_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, b0->free_list_index); + + 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)); + + + fib = ip6_fib_get (rx_fib_idx); + + //TODO: Revisit if hash makes sense here + p_vss = hash_get (dpm->vss_index_by_vrf_id, + fib->table_id); + if (p_vss) + { + vss = pool_elt_at_index (dpm->vss, p_vss[0]); + oui1 = vss->vpn_id.oui; + fib_id1 = vss->vpn_id.fib_id; + } + + 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); + } + if (server->insert_vss !=0 ) { + 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] = oui1>>16 & 0xff; + vss1->data[2] = oui1>>8 & 0xff; + vss1->data[3] = oui1 & 0xff; + vss1->data[4] = fib_id1>>24 & 0xff; + vss1->data[5] = fib_id1>>16 & 0xff; + vss1->data[6] = fib_id1>>8 & 0xff; + vss1->data[7] = fib_id1 & 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->dhcp6_server.as_u64[0] || server->dhcp6_server.as_u64[1]) ? + &server->dhcp6_server : &dpm->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 = (server->dhcp6_src_address.as_u64[0] || server->dhcp6_src_address.as_u64[1]) ? + &server->dhcp6_src_address : 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; + + 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->dhcp6_server); + } + + do_enqueue: + 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) = { + .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); + dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main; + dhcpv6_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_fib_t * svr_fib; + ip6_main_t * im = &ip6_main; + u32 server_fib_idx, svr_fib_id, client_fib_idx, server_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->fib_index_by_sw_if_index[sw_if_index]; + if (client_fib_idx < vec_len(dm->dhcp6_server_index_by_rx_fib_index)) + server_idx = dm->dhcp6_server_index_by_rx_fib_index[client_fib_idx]; + else + server_idx = 0; + + if (PREDICT_FALSE (pool_is_free_index (dm->dhcp6_servers, server_idx))) + { + error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION; + goto drop_packet; + } + + server = pool_elt_at_index (dm->dhcp6_servers, server_idx); + if (server->valid == 0) + { + 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]]; + svr_fib = ip6_fib_get (server_fib_idx); + svr_fib_id = svr_fib->table_id; + + if (svr_fib_id != server->server_fib6_index || + ip0->src_address.as_u64[0] != server->dhcp6_server.as_u64[0] || + ip0->src_address.as_u64[1] != server->dhcp6_server.as_u64[1]) + { + //drop packet if not from server with configured address or FIB + error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS; + goto drop_packet; + } + + 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) = { + .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 +}; + +clib_error_t * dhcpv6_proxy_init (vlib_main_t * vm) +{ + dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main; + vlib_node_t * error_drop_node; + dhcpv6_server_t * server; + + dm->vlib_main = vm; + dm->vnet_main = vnet_get_main(); + error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop"); + dm->error_drop_node_index = error_drop_node->index; + + dm->vss_index_by_vrf_id = hash_create (0, sizeof (uword)); + + /* RFC says this is the dhcpv6 server address */ + dm->all_dhcpv6_server_address.as_u64[0] = clib_host_to_net_u64 (0xFF05000000000000); + dm->all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003); + + /* RFC says this is the server and agent address */ + dm->all_dhcpv6_server_relay_agent_address.as_u64[0] = clib_host_to_net_u64 (0xFF02000000000000); + dm->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 */); + + /* Create the default server, don't mark it valid */ + pool_get (dm->dhcp6_servers, server); + memset (server, 0, sizeof (*server)); + + return 0; +} + +VLIB_INIT_FUNCTION (dhcpv6_proxy_init); + +/* Old API, manipulates a single server (only) shared by all Rx VRFs */ +int dhcpv6_proxy_set_server (ip6_address_t *addr, ip6_address_t *src_address, + u32 fib_id, int insert_vss, int is_del) +{ + return dhcpv6_proxy_set_server_2 (addr, src_address, + 0, fib_id, + insert_vss, is_del); +} + +int dhcpv6_proxy_set_server_2 (ip6_address_t *addr, ip6_address_t *src_address, + u32 rx_fib_id, u32 server_fib_id, + int insert_vss, int is_del) +{ + dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main; + dhcpv6_server_t * server = 0; + u32 server_fib_index = 0; + u32 rx_fib_index = 0; + + rx_fib_index = ip6_fib_table_find_or_create_and_lock(rx_fib_id); + server_fib_index = ip6_fib_table_find_or_create_and_lock(server_fib_id); + + if (is_del) + { + + if (rx_fib_index >= vec_len(dm->dhcp6_server_index_by_rx_fib_index)) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + server_fib_index = dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index]; + + dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index] = 0; + server = pool_elt_at_index (dm->dhcp6_servers, server_fib_index); + memset (server, 0, sizeof (*server)); + pool_put (dm->dhcp6_servers, server); + return 0; + } + + if (addr->as_u64[0] == 0 && + addr->as_u64[1] == 0 ) + return VNET_API_ERROR_INVALID_DST_ADDRESS; + + if (src_address->as_u64[0] == 0 && + src_address->as_u64[1] == 0) + return VNET_API_ERROR_INVALID_SRC_ADDRESS; + + if (rx_fib_id == 0) + { + server = pool_elt_at_index (dm->dhcp6_servers, 0); + + goto initialize_it; + } + + if (rx_fib_index < vec_len(dm->dhcp6_server_index_by_rx_fib_index)) + { + server_fib_index = dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index]; + if (server_fib_index != 0) + { + server = pool_elt_at_index (dm->dhcp6_servers, server_fib_index); + goto initialize_it; + } + } + + /*Allocate a new server*/ + pool_get (dm->dhcp6_servers, server); + + initialize_it: + + copy_ip6_address(&server->dhcp6_server, addr); + copy_ip6_address(&server->dhcp6_src_address, src_address); + server->server_fib6_index = server_fib_index; + server->valid = 1; + server->insert_vss = insert_vss; + + vec_validate (dm->dhcp6_server_index_by_rx_fib_index, rx_fib_index); + dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index] = + server - dm->dhcp6_servers; + + return 0; +} + +static clib_error_t * +dhcpv6_proxy_set_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + ip6_address_t addr, src_addr; + int set_server = 0, set_src_address = 0; + u32 rx_fib_id = 0, server_fib_id = 0; + int is_del = 0, add_vss = 0; + + while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "server %U", + unformat_ip6_address, &addr)) + set_server = 1; + else if (unformat(input, "src-address %U", + unformat_ip6_address, &src_addr)) + set_src_address =1; + else if (unformat (input, "server-fib-id %d", &server_fib_id)) + ; + else if (unformat (input, "rx-fib-id %d", &rx_fib_id)) + ; + else if (unformat (input, "add-vss-option") + || unformat (input, "insert-option")) + add_vss = 1; + else if (unformat (input, "delete") || + unformat (input, "del")) + is_del = 1; + else + break; + } + + if (is_del || (set_server && set_src_address)) + { + int rv; + + rv = dhcpv6_proxy_set_server_2 (&addr, &src_addr, rx_fib_id, + server_fib_id, add_vss, is_del); + + //TODO: Complete the errors + switch (rv) + { + case 0: + return 0; + + case -1: + return clib_error_return (0, "FIB id %d does not exist", server_fib_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> " + "[add-vss-option] [server-fib-id <fib-id>] [rx-fib-id <fib-id>] ", + .function = dhcpv6_proxy_set_command_fn, +}; + +u8 * format_dhcpv6_proxy_server (u8 * s, va_list * args) +{ + dhcpv6_proxy_main_t * dm = va_arg (*args, dhcpv6_proxy_main_t *); + dhcpv6_server_t * server = va_arg (*args, dhcpv6_server_t *); + u32 rx_fib_index = va_arg (*args, u32); + ip6_fib_t * rx_fib, * server_fib; + u32 server_fib_id = (u32)~0, rx_fib_id = ~0; + + if (dm == 0) + { + s = format (s, "%=40s%=40s%=14s%=14s%=20s", "Server Address", "Source Address", + "Server FIB", "RX FIB", "Insert VSS Option"); + return s; + } + + server_fib = ip6_fib_get(server->server_fib6_index); + if (server_fib) + server_fib_id= server_fib->table_id; + + rx_fib= ip6_fib_get(rx_fib_index); + + if (rx_fib) + rx_fib_id = rx_fib->table_id; + + s = format (s, "%=40U%=40U%=14u%=14u%=20s", + format_ip6_address, &server->dhcp6_server, + format_ip6_address, &server->dhcp6_src_address, + server_fib_id, rx_fib_id, + server->insert_vss ? "yes" : "no"); + return s; +} + +static clib_error_t * +dhcpv6_proxy_show_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main; + ip6_main_t * im = &ip6_main; + int i; + u32 server_index; + dhcpv6_server_t * server; + + vlib_cli_output (vm, "%U", format_dhcpv6_proxy_server, 0 /* header line */, + 0, 0); + for (i = 0; i < vec_len (im->fibs); i++) + { + if (i < vec_len(dm->dhcp6_server_index_by_rx_fib_index)) + server_index = dm->dhcp6_server_index_by_rx_fib_index[i]; + else + server_index = 0; + server = pool_elt_at_index (dm->dhcp6_servers, server_index); + if (server->valid) + vlib_cli_output (vm, "%U", format_dhcpv6_proxy_server, dm, + server, i); + } + return 0; +} + +VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = { + .path = "show dhcpv6 proxy", + .short_help = "Display dhcpv6 proxy info", + .function = dhcpv6_proxy_show_command_fn, +}; + +int dhcpv6_proxy_set_vss(u32 tbl_id, + u32 oui, + u32 fib_id, + int is_del) +{ + dhcpv6_proxy_main_t *dm = &dhcpv6_proxy_main; + u32 old_oui, old_fib_id; + uword *p; + dhcpv6_vss_info *v; + + p = hash_get (dm->vss_index_by_vrf_id, tbl_id); + + if (p) { + v = pool_elt_at_index (dm->vss, p[0]); + if (!v) + return VNET_API_ERROR_NO_SUCH_FIB; + + old_oui = v->vpn_id.oui; + old_fib_id = v->vpn_id.fib_id; + + if (is_del) + { + if (old_oui == oui && + old_fib_id == fib_id ) + { + pool_put(dm->vss, v); + hash_unset (dm->vss_index_by_vrf_id, tbl_id); + return 0; + } + else + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + pool_put(dm->vss, v); + hash_unset (dm->vss_index_by_vrf_id, tbl_id); + } else if (is_del) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + pool_get (dm->vss, v); + memset (v, ~0, sizeof (*v)); + v->vpn_id.fib_id = fib_id; + v->vpn_id.oui = oui; + hash_set (dm->vss_index_by_vrf_id, tbl_id, v - dm->vss); + + return 0; +} + + +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 = dhcpv6_proxy_set_vss(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) + +{ + dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main; + dhcpv6_vss_info *v; + u32 oui; + u32 fib_id; + u32 tbl_id; + uword index; + + vlib_cli_output (vm, "%=6s%=6s%=12s","Table", "OUI", "VPN ID"); + hash_foreach (tbl_id, index, dm->vss_index_by_vrf_id, + ({ + v = pool_elt_at_index (dm->vss, index); + oui = v->vpn_id.oui; + fib_id = v->vpn_id.fib_id; + vlib_cli_output (vm, "%=6d%=6d%=12d", + tbl_id, oui, fib_id); + })); + + return 0; +} + +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) + +{ + dhcpv6_proxy_main_t *dm = &dhcpv6_proxy_main; + vnet_main_t *vnm = vnet_get_main(); + u32 sw_if_index0=0, sw_if_index; + ip6_address_t *ia0; + vnet_sw_interface_t *swif; + + while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) + { + + if (unformat(input, "%U", + unformat_vnet_sw_interface, dm->vnet_main, &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, dm->vnet_main, 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, dm->vnet_main, 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, +}; |