diff options
Diffstat (limited to 'src/vnet/dhcp/client.c')
| -rw-r--r-- | src/vnet/dhcp/client.c | 1135 |
1 files changed, 1135 insertions, 0 deletions
diff --git a/src/vnet/dhcp/client.c b/src/vnet/dhcp/client.c new file mode 100644 index 00000000..5986438b --- /dev/null +++ b/src/vnet/dhcp/client.c @@ -0,0 +1,1135 @@ +/* + * Copyright (c) 2015 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include <vlib/vlib.h> +#include <vnet/dhcp/client.h> +#include <vnet/dhcp/dhcp_proxy.h> +#include <vnet/fib/fib_table.h> + +dhcp_client_main_t dhcp_client_main; +static u8 * format_dhcp_client_state (u8 * s, va_list * va); +static vlib_node_registration_t dhcp_client_process_node; + +static void +dhcp_client_add_rx_address (dhcp_client_main_t * dcm, dhcp_client_t * c) +{ + /* Install a local entry for the offered address */ + fib_prefix_t rx = + { + .fp_len = 32, + .fp_addr.ip4 = c->leased_address, + .fp_proto = FIB_PROTOCOL_IP4, + }; + + fib_table_entry_special_add(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &rx, + FIB_SOURCE_DHCP, + (FIB_ENTRY_FLAG_LOCAL)); + + /* And add the server's address as uRPF exempt so we can accept + * local packets from it */ + fib_prefix_t server = + { + .fp_len = 32, + .fp_addr.ip4 = c->dhcp_server, + .fp_proto = FIB_PROTOCOL_IP4, + }; + + fib_table_entry_special_add(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &server, + FIB_SOURCE_URPF_EXEMPT, + (FIB_ENTRY_FLAG_DROP)); +} + +static void +dhcp_client_remove_rx_address (dhcp_client_main_t * dcm, dhcp_client_t * c) +{ + fib_prefix_t rx = + { + .fp_len = 32, + .fp_addr.ip4 = c->leased_address, + .fp_proto = FIB_PROTOCOL_IP4, + }; + + fib_table_entry_special_remove(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &rx, + FIB_SOURCE_DHCP); + fib_prefix_t server = + { + .fp_len = 32, + .fp_addr.ip4 = c->dhcp_server, + .fp_proto = FIB_PROTOCOL_IP4, + }; + + fib_table_entry_special_remove(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &server, + FIB_SOURCE_URPF_EXEMPT); +} + +static void +dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c) +{ + /* + * Install any/all info gleaned from dhcp, right here + */ + ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index, + (void *) &c->leased_address, + c->subnet_mask_width, 0 /*is_del*/); +} + +static void +dhcp_client_release_address (dhcp_client_main_t * dcm, dhcp_client_t * c) +{ + /* + * Remove any/all info gleaned from dhcp, right here. Caller(s) + * have not wiped out the info yet. + */ + + ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index, + (void *) &c->leased_address, + c->subnet_mask_width, 1 /*is_del*/); +} + +static void +set_l2_rewrite (dhcp_client_main_t * dcm, dhcp_client_t * c) +{ + /* Acquire the L2 rewrite string for the indicated sw_if_index */ + c->l2_rewrite = vnet_build_rewrite_for_sw_interface( + dcm->vnet_main, + c->sw_if_index, + VNET_LINK_IP4, + 0 /* broadcast */); +} + +void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); + +static void +dhcp_client_proc_callback (uword * client_index) +{ + vlib_main_t *vm = vlib_get_main (); + ASSERT (vlib_get_thread_index () == 0); + vlib_process_signal_event (vm, dhcp_client_process_node.index, + EVENT_DHCP_CLIENT_WAKEUP, *client_index); +} + +/* + * dhcp_client_for_us - server-to-client callback. + * Called from proxy_node.c:dhcp_proxy_to_client_input(). + * This function first decides that the packet in question is + * actually for the dhcp client code in case we're also acting as + * a dhcp proxy. Ay caramba, what a folly! + */ +int dhcp_client_for_us (u32 bi, vlib_buffer_t * b, + ip4_header_t * ip, + udp_header_t * udp, + dhcp_header_t * dhcp) +{ + dhcp_client_main_t * dcm = &dhcp_client_main; + vlib_main_t * vm = dcm->vlib_main; + dhcp_client_t * c; + uword * p; + f64 now = vlib_time_now (dcm->vlib_main); + u8 dhcp_message_type = 0; + dhcp_option_t * o; + + /* + * Doing dhcp client on this interface? + * Presumably we will always receive dhcp clnt for-us pkts on + * the interface that's asking for an address. + */ + p = hash_get (dcm->client_by_sw_if_index, + vnet_buffer(b)->sw_if_index [VLIB_RX]); + if (p == 0) + return 0; /* no */ + + c = pool_elt_at_index (dcm->clients, p[0]); + + /* Mixing dhcp relay and dhcp proxy? DGMS... */ + if (c->state == DHCP_BOUND && c->retry_count == 0) + return 0; + + /* parse through the packet, learn what we can */ + if (dhcp->your_ip_address.as_u32) + c->leased_address.as_u32 = dhcp->your_ip_address.as_u32; + + c->dhcp_server.as_u32 = dhcp->server_ip_address.as_u32; + + o = (dhcp_option_t *) dhcp->options; + + while (o->option != 0xFF /* end of options */ && + (u8 *) o < (b->data + b->current_data + b->current_length)) + { + switch (o->option) + { + case 53: /* dhcp message type */ + dhcp_message_type = o->data[0]; + break; + + case 51: /* lease time */ + { + u32 lease_time_in_seconds = + clib_host_to_net_u32 (o->data_as_u32[0]); + c->lease_expires = now + (f64) lease_time_in_seconds; + c->lease_lifetime = lease_time_in_seconds; + /* Set a sensible default, in case we don't get opt 58 */ + c->lease_renewal_interval = lease_time_in_seconds / 2; + } + break; + + case 58: /* lease renew time in seconds */ + { + u32 lease_renew_time_in_seconds = + clib_host_to_net_u32 (o->data_as_u32[0]); + c->lease_renewal_interval = lease_renew_time_in_seconds; + } + break; + + case 54: /* dhcp server address */ + c->dhcp_server.as_u32 = o->data_as_u32[0]; + break; + + case 1: /* subnet mask */ + { + u32 subnet_mask = + clib_host_to_net_u32 (o->data_as_u32[0]); + c->subnet_mask_width = count_set_bits (subnet_mask); + } + break; + case 3: /* router address */ + { + u32 router_address = o->data_as_u32[0]; + c->router_address.as_u32 = router_address; + } + break; + + case 12: /* hostname */ + { + /* Replace the existing hostname if necessary */ + vec_free (c->hostname); + vec_validate (c->hostname, o->length - 1); + clib_memcpy (c->hostname, o->data, o->length); + } + break; + + /* $$$$ Your message in this space, parse more options */ + default: + break; + } + + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + + switch (c->state) + { + case DHCP_DISCOVER: + if (dhcp_message_type != DHCP_PACKET_OFFER) + { + clib_warning ("sw_if_index %d state %U message type %d", + c->sw_if_index, format_dhcp_client_state, + c->state, dhcp_message_type); + c->next_transmit = now + 5.0; + break; + } + /* + * in order to accept unicasted ACKs we need to configure the offered + * address on the interface. However, at this point we may not know the + * subnet-mask (an OFFER may not contain it). So add a temporary receice + * and uRPF excempt entry + */ + dhcp_client_add_rx_address (dcm, c); + + /* Received an offer, go send a request */ + c->state = DHCP_REQUEST; + c->retry_count = 0; + c->next_transmit = 0; /* send right now... */ + /* Poke the client process, which will send the request */ + uword client_id = c - dcm->clients; + vl_api_rpc_call_main_thread (dhcp_client_proc_callback, + (u8 *) &client_id, sizeof (uword)); + break; + + case DHCP_BOUND: + case DHCP_REQUEST: + if (dhcp_message_type != DHCP_PACKET_ACK) + { + clib_warning ("sw_if_index %d state %U message type %d", + c->sw_if_index, format_dhcp_client_state, + c->state, dhcp_message_type); + c->next_transmit = now + 5.0; + break; + } + /* OK, we own the address (etc), add to the routing table(s) */ + if (c->state == DHCP_REQUEST) + { + void (*fp)(u32, u32, u8 *, u8, u8, u8 *, u8 *, u8 *) = c->event_callback; + + /* replace the temporary RX address with the correct subnet */ + dhcp_client_remove_rx_address (dcm, c); + dhcp_client_acquire_address (dcm, c); + + /* + * Configure default IP route: + */ + if (c->router_address.as_u32) + { + fib_prefix_t all_0s = + { + .fp_len = 0, + .fp_addr.ip4.as_u32 = 0x0, + .fp_proto = FIB_PROTOCOL_IP4, + }; + ip46_address_t nh = + { + .ip4 = c->router_address, + }; + + fib_table_entry_path_add (fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &all_0s, + FIB_SOURCE_DHCP, + FIB_ENTRY_FLAG_NONE, + DPO_PROTO_IP4, + &nh, + c->sw_if_index, + ~0, + 1, + NULL, // no label stack + FIB_ROUTE_PATH_FLAG_NONE); + } + + /* + * Call the user's event callback to report DHCP information + */ + if (fp) + (*fp) (c->client_index, /* clinet index */ + c->pid, + c->hostname, + c->subnet_mask_width, + 0, /* is_ipv6 */ + (u8 *)&c->leased_address, /* host IP address */ + (u8 *)&c->router_address, /* router IP address */ + (u8 *)(c->l2_rewrite + 6));/* host MAC address */ + } + + c->state = DHCP_BOUND; + c->retry_count = 0; + c->next_transmit = now + (f64) c->lease_renewal_interval; + c->lease_expires = now + (f64) c->lease_lifetime; + break; + + default: + clib_warning ("client %d bogus state %d", + c - dcm->clients, c->state); + break; + } + + /* drop the pkt, return 1 */ + vlib_buffer_free (vm, &bi, 1); + return 1; +} + +static void +send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c, + dhcp_packet_type_t type, int is_broadcast) +{ + vlib_main_t * vm = dcm->vlib_main; + vnet_main_t * vnm = dcm->vnet_main; + vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, c->sw_if_index); + vnet_sw_interface_t * sup_sw + = vnet_get_sup_sw_interface (vnm, c->sw_if_index); + vnet_sw_interface_t * sw = vnet_get_sw_interface (vnm, c->sw_if_index); + vlib_buffer_t * b; + u32 bi; + ip4_header_t * ip; + udp_header_t * udp; + dhcp_header_t * dhcp; + u32 * to_next; + vlib_frame_t * f; + dhcp_option_t * o; + u16 udp_length, ip_length; + + /* Interface(s) down? */ + if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0) + return; + if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0) + return; + if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0) + return; + + if (vlib_buffer_alloc (vm, &bi, 1) != 1) { + clib_warning ("buffer allocation failure"); + c->next_transmit = 0; + return; + } + + /* Build a dhcpv4 pkt from whole cloth */ + b = vlib_get_buffer (vm, bi); + + ASSERT (b->current_data == 0); + + vnet_buffer(b)->sw_if_index[VLIB_RX] = c->sw_if_index; + if (is_broadcast) + { + f = vlib_get_frame_to_node (vm, hw->output_node_index); + vnet_buffer(b)->sw_if_index[VLIB_TX] = c->sw_if_index; + clib_memcpy (b->data, c->l2_rewrite, vec_len(c->l2_rewrite)); + ip = (void *) + (((u8 *)vlib_buffer_get_current (b)) + vec_len (c->l2_rewrite)); + } + else + { + f = vlib_get_frame_to_node (vm, ip4_lookup_node.index); + vnet_buffer(b)->sw_if_index[VLIB_TX] = ~0; /* use interface VRF */ + ip = vlib_buffer_get_current (b); + } + + /* Enqueue the packet right now */ + to_next = vlib_frame_vector_args (f); + to_next[0] = bi; + f->n_vectors = 1; + + if (is_broadcast) + vlib_put_frame_to_node (vm, hw->output_node_index, f); + else + vlib_put_frame_to_node (vm, ip4_lookup_node.index, f); + + udp = (udp_header_t *)(ip+1); + dhcp = (dhcp_header_t *)(udp+1); + + /* $$$ optimize, maybe */ + memset (ip, 0, sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp)); + + ip->ip_version_and_header_length = 0x45; + ip->ttl = 128; + ip->protocol = IP_PROTOCOL_UDP; + + if (is_broadcast) + { + /* src = 0.0.0.0, dst = 255.255.255.255 */ + ip->dst_address.as_u32 = ~0; + } + else + { + /* Renewing an active lease, plain old ip4 src/dst */ + ip->src_address.as_u32 = c->leased_address.as_u32; + ip->dst_address.as_u32 = c->dhcp_server.as_u32; + } + + udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client); + udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server); + + /* Send the interface MAC address */ + clib_memcpy (dhcp->client_hardware_address, c->l2_rewrite + 6, 6); + + /* Lease renewal, set up client_ip_address */ + if (is_broadcast == 0) + dhcp->client_ip_address.as_u32 = c->leased_address.as_u32; + + dhcp->opcode = 1; /* request, all we send */ + dhcp->hardware_type = 1; /* ethernet */ + dhcp->hardware_address_length = 6; + dhcp->transaction_identifier = c->transaction_id; + dhcp->flags = clib_host_to_net_u16(is_broadcast ? DHCP_FLAG_BROADCAST : 0); + dhcp->magic_cookie.as_u32 = DHCP_MAGIC; + + o = (dhcp_option_t * )dhcp->options; + + /* Send option 53, the DHCP message type */ + o->option = DHCP_PACKET_OPTION_MSG_TYPE; + o->length = 1; + o->data[0] = type; + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + + /* Send option 57, max msg length */ + if (0 /* not needed, apparently */) + { + o->option = 57; + o->length = 2; + { + u16 *o2 = (u16 *) o->data; + *o2 = clib_host_to_net_u16 (1152); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + } + + /* + * If server ip address is available with non-zero value, + * option 54 (DHCP Server Identifier) is sent. + */ + if (c->dhcp_server.as_u32) + { + o->option = 54; + o->length = 4; + clib_memcpy (o->data, &c->dhcp_server.as_u32, 4); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + + /* send option 50, requested IP address */ + if (c->leased_address.as_u32) + { + o->option = 50; + o->length = 4; + clib_memcpy (o->data, &c->leased_address.as_u32, 4); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + + /* send option 12, host name */ + if (vec_len (c->hostname)) + { + o->option = 12; + o->length = vec_len (c->hostname); + clib_memcpy (o->data, c->hostname, vec_len (c->hostname)); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + + /* send option 61, client_id */ + if (vec_len (c->client_identifier)) + { + o->option = 61; + o->length = vec_len (c->client_identifier); + clib_memcpy (o->data, c->client_identifier, + vec_len (c->client_identifier)); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + } + + /* $$ maybe send the client s/w version if anyone cares */ + + /* + * send option 55, parameter request list + * The current list - see below, matches the Linux dhcp client's list + * Any specific dhcp server config and/or dhcp server may or may + * not yield specific options. + */ + o->option = 55; + o->length = vec_len (c->option_55_data); + clib_memcpy (o->data, c->option_55_data, vec_len(c->option_55_data)); + o = (dhcp_option_t *) (((uword) o) + (o->length + 2)); + + /* End of list */ + o->option = 0xff; + o->length = 0; + o++; + + b->current_length = ((u8 *)o) - b->data; + + /* fix ip length, checksum and udp length */ + ip_length = vlib_buffer_length_in_chain (vm, b); + if (is_broadcast) + ip_length -= vec_len (c->l2_rewrite); + + ip->length = clib_host_to_net_u16(ip_length); + ip->checksum = ip4_header_checksum(ip); + + udp_length = ip_length - (sizeof (*ip)); + udp->length = clib_host_to_net_u16 (udp_length); +} + +static int +dhcp_discover_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now) +{ + /* + * State machine "DISCOVER" state. Send a dhcp discover packet, + * eventually back off the retry rate. + */ + send_dhcp_pkt (dcm, c, DHCP_PACKET_DISCOVER, 1 /* is_broadcast */); + + c->retry_count++; + if (c->retry_count > 10) + c->next_transmit = now + 5.0; + else + c->next_transmit = now + 1.0; + return 0; +} + +static int +dhcp_request_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now) +{ + /* + * State machine "REQUEST" state. Send a dhcp request packet, + * eventually drop back to the discover state. + */ + send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 1 /* is_broadcast */); + + c->retry_count++; + if (c->retry_count > 7 /* lucky you */) + { + c->state = DHCP_DISCOVER; + c->next_transmit = now; + c->retry_count = 0; + return 1; + } + c->next_transmit = now + 1.0; + return 0; +} + +static int +dhcp_bound_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now) +{ + /* + * State machine "BOUND" state. Send a dhcp request packet, + * eventually, when the lease expires, forget the dhcp data + * and go back to the stone age. + */ + send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 0 /* is_broadcast */); + + c->retry_count++; + if (c->retry_count > 10) + c->next_transmit = now + 5.0; + else + c->next_transmit = now + 1.0; + + if (now > c->lease_expires) + { + if (c->router_address.as_u32) + { + fib_prefix_t all_0s = + { + .fp_len = 0, + .fp_addr.ip4.as_u32 = 0x0, + .fp_proto = FIB_PROTOCOL_IP4, + }; + ip46_address_t nh = { + .ip4 = c->router_address, + }; + + fib_table_entry_path_remove(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &all_0s, + FIB_SOURCE_DHCP, + DPO_PROTO_IP4, + &nh, + c->sw_if_index, + ~0, + 1, + FIB_ROUTE_PATH_FLAG_NONE); + } + + dhcp_client_release_address (dcm, c); + c->state = DHCP_DISCOVER; + c->next_transmit = now; + c->retry_count = 0; + /* Wipe out any memory of the address we had... */ + c->leased_address.as_u32 = 0; + c->subnet_mask_width = 0; + c->router_address.as_u32 = 0; + c->lease_renewal_interval = 0; + c->dhcp_server.as_u32 = 0; + return 1; + } + return 0; +} + +static f64 dhcp_client_sm (f64 now, f64 timeout, uword pool_index) +{ + dhcp_client_main_t * dcm = &dhcp_client_main; + dhcp_client_t * c; + + /* deleted, pooched, yadda yadda yadda */ + if (pool_is_free_index (dcm->clients, pool_index)) + return timeout; + + c = pool_elt_at_index (dcm->clients, pool_index); + + /* Time for us to do something with this client? */ + if (now < c->next_transmit) + return timeout; + + again: + switch (c->state) + { + case DHCP_DISCOVER: /* send a discover */ + if (dhcp_discover_state (dcm, c, now)) + goto again; + break; + + case DHCP_REQUEST: /* send a request */ + if (dhcp_request_state (dcm, c, now)) + goto again; + break; + + case DHCP_BOUND: /* bound, renew needed? */ + if (dhcp_bound_state (dcm, c, now)) + goto again; + break; + + default: + clib_warning ("dhcp client %d bogus state %d", + c - dcm->clients, c->state); + break; + } + + if (c->next_transmit < now + timeout) + return c->next_transmit - now; + + return timeout; +} + +static uword +dhcp_client_process (vlib_main_t * vm, + vlib_node_runtime_t * rt, + vlib_frame_t * f) +{ + f64 timeout = 100.0; + f64 now; + uword event_type; + uword * event_data = 0; + dhcp_client_main_t * dcm = &dhcp_client_main; + dhcp_client_t * c; + int i; + + while (1) + { + vlib_process_wait_for_event_or_clock (vm, timeout); + + event_type = vlib_process_get_events (vm, &event_data); + + now = vlib_time_now (vm); + + switch (event_type) + { + case EVENT_DHCP_CLIENT_WAKEUP: + for (i = 0; i < vec_len (event_data); i++) + timeout = dhcp_client_sm (now, timeout, event_data[i]); + break; + + case ~0: + pool_foreach (c, dcm->clients, + ({ + timeout = dhcp_client_sm (now, timeout, + (uword)(c - dcm->clients)); + })); + if (pool_elts (dcm->clients) == 0) + timeout = 100.0; + break; + } + + vec_reset_length (event_data); + } + + /* NOTREACHED */ + return 0; +} + +VLIB_REGISTER_NODE (dhcp_client_process_node,static) = { + .function = dhcp_client_process, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "dhcp-client-process", + .process_log2_n_stack_bytes = 16, +}; + +static u8 * format_dhcp_client_state (u8 * s, va_list * va) +{ + dhcp_client_state_t state = va_arg (*va, dhcp_client_state_t); + char * str = "BOGUS!"; + + switch (state) + { +#define _(a) \ + case a: \ + str = #a; \ + break; + foreach_dhcp_client_state; +#undef _ + default: + break; + } + + s = format (s, "%s", str); + return s; +} + +static u8 * format_dhcp_client (u8 * s, va_list * va) +{ + dhcp_client_main_t * dcm = va_arg (*va, dhcp_client_main_t *); + dhcp_client_t * c = va_arg (*va, dhcp_client_t *); + int verbose = va_arg (*va, int); + + s = format (s, "[%d] %U state %U ", c - dcm->clients, + format_vnet_sw_if_index_name, dcm->vnet_main, c->sw_if_index, + format_dhcp_client_state, c->state); + + if (c->leased_address.as_u32) + s = format (s, "addr %U/%d gw %U\n", + format_ip4_address, &c->leased_address, + c->subnet_mask_width, format_ip4_address, &c->router_address); + else + s = format (s, "no address\n"); + + if (verbose) + { + s = format (s, "retry count %d, next xmt %.2f", + c->retry_count, c->next_transmit); + } + return s; +} + +static clib_error_t * +show_dhcp_client_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + dhcp_client_main_t * dcm = &dhcp_client_main; + dhcp_client_t * c; + int verbose = 0; + u32 sw_if_index = ~0; + uword * p; + + while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "intfc %U", + unformat_vnet_sw_interface, dcm->vnet_main, + &sw_if_index)) + ; + else if (unformat (input, "verbose")) + verbose = 1; + else + break; + } + + if (sw_if_index != ~0) + { + p = hash_get (dcm->client_by_sw_if_index, sw_if_index); + if (p == 0) + return clib_error_return (0, "dhcp client not configured"); + c = pool_elt_at_index (dcm->clients, p[0]); + vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose); + return 0; + } + + pool_foreach (c, dcm->clients, + ({ + vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose); + })); + + return 0; +} + +VLIB_CLI_COMMAND (show_dhcp_client_command, static) = { + .path = "show dhcp client", + .short_help = "show dhcp client [intfc <intfc>][verbose]", + .function = show_dhcp_client_command_fn, +}; + + +int dhcp_client_add_del (dhcp_client_add_del_args_t * a) +{ + dhcp_client_main_t * dcm = &dhcp_client_main; + vlib_main_t * vm = dcm->vlib_main; + dhcp_client_t * c; + uword * p; + fib_prefix_t all_1s = + { + .fp_len = 32, + .fp_addr.ip4.as_u32 = 0xffffffff, + .fp_proto = FIB_PROTOCOL_IP4, + }; + fib_prefix_t all_0s = + { + .fp_len = 0, + .fp_addr.ip4.as_u32 = 0x0, + .fp_proto = FIB_PROTOCOL_IP4, + }; + + p = hash_get (dcm->client_by_sw_if_index, a->sw_if_index); + + if ((p && a->is_add) || (!p && a->is_add == 0)) + return VNET_API_ERROR_INVALID_VALUE; + + if (a->is_add) + { + pool_get (dcm->clients, c); + memset (c, 0, sizeof (*c)); + c->state = DHCP_DISCOVER; + c->sw_if_index = a->sw_if_index; + c->client_index = a->client_index; + c->pid = a->pid; + c->event_callback = a->event_callback; + c->option_55_data = a->option_55_data; + c->hostname = a->hostname; + c->client_identifier = a->client_identifier; + do { + c->transaction_id = random_u32 (&dcm->seed); + } while (c->transaction_id == 0); + set_l2_rewrite (dcm, c); + hash_set (dcm->client_by_sw_if_index, a->sw_if_index, c - dcm->clients); + + /* this add is ref counted by FIB so we can add for each itf */ + fib_table_entry_special_add(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &all_1s, + FIB_SOURCE_DHCP, + FIB_ENTRY_FLAG_LOCAL); + + /* + * enable the interface to RX IPv4 packets + * this is also ref counted + */ + ip4_sw_interface_enable_disable (c->sw_if_index, 1); + + vlib_process_signal_event (vm, dhcp_client_process_node.index, + EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients); + } + else + { + c = pool_elt_at_index (dcm->clients, p[0]); + + fib_table_entry_special_remove(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &all_1s, + FIB_SOURCE_DHCP); + + if (c->router_address.as_u32) + { + ip46_address_t nh = { + .ip4 = c->router_address, + }; + + fib_table_entry_path_remove(fib_table_get_index_for_sw_if_index( + FIB_PROTOCOL_IP4, + c->sw_if_index), + &all_0s, + FIB_SOURCE_DHCP, + DPO_PROTO_IP4, + &nh, + c->sw_if_index, + ~0, + 1, + FIB_ROUTE_PATH_FLAG_NONE); + } + dhcp_client_remove_rx_address (dcm, c); + dhcp_client_release_address (dcm, c); + ip4_sw_interface_enable_disable (c->sw_if_index, 0); + + vec_free (c->option_55_data); + vec_free (c->hostname); + vec_free (c->client_identifier); + vec_free (c->l2_rewrite); + hash_unset (dcm->client_by_sw_if_index, c->sw_if_index); + pool_put (dcm->clients, c); + } + return 0; +} + +int +dhcp_client_config (vlib_main_t * vm, + u32 sw_if_index, + u8 * hostname, + u8 * client_id, + u32 is_add, + u32 client_index, + void * event_callback, + u32 pid) +{ + dhcp_client_add_del_args_t _a, *a = &_a; + int rv; + + memset (a, 0, sizeof (*a)); + a->is_add = is_add; + a->sw_if_index = sw_if_index; + a->client_index = client_index; + a->pid = pid; + a->event_callback = event_callback; + vec_validate(a->hostname, strlen((char *)hostname) - 1); + strncpy((char *)a->hostname, (char *)hostname, vec_len(a->hostname)); + vec_validate(a->client_identifier, strlen((char *)client_id) - 1); + strncpy((char *)a->client_identifier, (char *)client_id, vec_len(a->client_identifier)); + + /* + * Option 55 request list. These data precisely match + * the Ubuntu dhcp client. YMMV. + */ + + /* Subnet Mask */ + vec_add1 (a->option_55_data, 1); + /* Broadcast address */ + vec_add1 (a->option_55_data, 28); + /* time offset */ + vec_add1 (a->option_55_data, 2); + /* Router */ + vec_add1 (a->option_55_data, 3); + /* Domain Name */ + vec_add1 (a->option_55_data, 15); + /* DNS */ + vec_add1 (a->option_55_data, 6); + /* Domain search */ + vec_add1 (a->option_55_data, 119); + /* Host name */ + vec_add1 (a->option_55_data, 12); + /* NetBIOS name server */ + vec_add1 (a->option_55_data, 44); + /* NetBIOS Scope */ + vec_add1 (a->option_55_data, 47); + /* MTU */ + vec_add1 (a->option_55_data, 26); + /* Classless static route */ + vec_add1 (a->option_55_data, 121); + /* NTP servers */ + vec_add1 (a->option_55_data, 42); + + rv = dhcp_client_add_del (a); + + switch (rv) + { + case 0: + break; + + case VNET_API_ERROR_INVALID_VALUE: + + vec_free (a->hostname); + vec_free (a->client_identifier); + vec_free (a->option_55_data); + + if (is_add) + clib_warning ("dhcp client already enabled on intf_idx %d", + sw_if_index); + else + clib_warning ("dhcp client not enabled on on intf_idx %d", + sw_if_index); + break; + + default: + clib_warning ("dhcp_client_add_del returned %d", rv); + } + + return rv; +} + +static clib_error_t * +dhcp_client_set_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + + dhcp_client_main_t * dcm = &dhcp_client_main; + u32 sw_if_index; + u8 * hostname = 0; + u8 sw_if_index_set = 0; + int is_add = 1; + dhcp_client_add_del_args_t _a, *a = &_a; + int rv; + + while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "intfc %U", + unformat_vnet_sw_interface, dcm->vnet_main, + &sw_if_index)) + sw_if_index_set = 1; + else if (unformat (input, "hostname %v", &hostname)) + ; + else if (unformat (input, "del")) + is_add = 0; + else + break; + } + + if (sw_if_index_set == 0) + return clib_error_return (0, "interface not specified"); + + memset (a, 0, sizeof (*a)); + a->is_add = is_add; + a->sw_if_index = sw_if_index; + a->hostname = hostname; + a->client_identifier = format (0, "vpe 1.0%c", 0); + + /* + * Option 55 request list. These data precisely match + * the Ubuntu dhcp client. YMMV. + */ + + /* Subnet Mask */ + vec_add1 (a->option_55_data, 1); + /* Broadcast address */ + vec_add1 (a->option_55_data, 28); + /* time offset */ + vec_add1 (a->option_55_data, 2); + /* Router */ + vec_add1 (a->option_55_data, 3); + /* Domain Name */ + vec_add1 (a->option_55_data, 15); + /* DNS */ + vec_add1 (a->option_55_data, 6); + /* Domain search */ + vec_add1 (a->option_55_data, 119); + /* Host name */ + vec_add1 (a->option_55_data, 12); + /* NetBIOS name server */ + vec_add1 (a->option_55_data, 44); + /* NetBIOS Scope */ + vec_add1 (a->option_55_data, 47); + /* MTU */ + vec_add1 (a->option_55_data, 26); + /* Classless static route */ + vec_add1 (a->option_55_data, 121); + /* NTP servers */ + vec_add1 (a->option_55_data, 42); + + rv = dhcp_client_add_del (a); + + switch (rv) + { + case 0: + break; + + case VNET_API_ERROR_INVALID_VALUE: + + vec_free (a->hostname); + vec_free (a->client_identifier); + vec_free (a->option_55_data); + if (is_add) + return clib_error_return (0, "dhcp client already enabled on %U", + format_vnet_sw_if_index_name, + dcm->vnet_main, sw_if_index); + else + return clib_error_return (0, "dhcp client not enabled on %U", + format_vnet_sw_if_index_name, + dcm->vnet_main, sw_if_index); + break; + + default: + vlib_cli_output (vm, "dhcp_client_add_del returned %d", rv); + } + + return 0; +} + +VLIB_CLI_COMMAND (dhcp_client_set_command, static) = { + .path = "set dhcp client", + .short_help = "set dhcp client [del] intfc <interface> [hostname <name>]", + .function = dhcp_client_set_command_fn, +}; + +static clib_error_t * +dhcp_client_init (vlib_main_t * vm) +{ + dhcp_client_main_t * dcm = &dhcp_client_main; + + dcm->vlib_main = vm; + dcm->vnet_main = vnet_get_main(); + dcm->seed = 0xdeaddabe; + return 0; +} + +VLIB_INIT_FUNCTION (dhcp_client_init); |