NAT: VPP-1552 code migration from old multiarch scheme - vpp

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author	Filip Varga <fivarga@cisco.com>	2019-02-13 01:42:59 -0800
committer	Damjan Marion <dmarion@me.com>	2019-02-18 16:46:50 +0000
commit	e69e423743630b52e13db58c3f0229df8a46c07f (patch)
tree	5471b64b7fe38031f47791c987f9791fc8207fa7 /src/plugins/nat/nat.c
parent	7dcb80a202f1ce075434a17ace3334a7a311e84e (diff)

NAT: VPP-1552 code migration from old multiarch scheme

Change-Id: I88f3df8aaa521e7707ef3335acdbf1ab41e7ee28 Signed-off-by: Filip Varga <fivarga@cisco.com>

Diffstat (limited to 'src/plugins/nat/nat.c')

-rwxr-xr-x

src/plugins/nat/nat.c

1 files changed, 57 insertions, 4 deletions

/* * 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; #define foreach_dhcp_sent_packet_stat \ _(DISCOVER, "DHCP discover packets sent") \ _(OFFER, "DHCP offer packets sent") \ _(REQUEST, "DHCP request packets sent") \ _(ACK, "DHCP ack packets sent") #define foreach_dhcp_error_counter \ _(NOT_FOR_US, "DHCP packets for other hosts, dropped") \ _(NAK, "DHCP nak packets received") \ _(NON_OFFER_DISCOVER, "DHCP non-offer packets in discover state") \ _(ODDBALL, "DHCP non-ack, non-offer packets received") \ _(BOUND, "DHCP bind success") typedef enum { #define _(sym,str) DHCP_STAT_##sym, foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter #undef _ DHCP_STAT_UNKNOWN, DHCP_STAT_N_STAT, } sample_error_t; static char *dhcp_client_process_stat_strings[] = { #define _(sym,string) string, foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter #undef _ "DHCP unknown packets sent", }; 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); } static void dhcp_client_addr_callback (dhcp_client_t * c) { dhcp_client_main_t *dcm = &dhcp_client_main; /* disable the feature */ vnet_feature_enable_disable ("ip4-unicast", "ip4-dhcp-client-detect", c->sw_if_index, 0 /* disable */ , 0, 0); c->client_detect_feature_enabled = 0; /* if renewing the lease, the address and route have already been added */ if (c->state == DHCP_BOUND) return; /* add the address to the interface */ 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, }; /* *INDENT-OFF* */ 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); /* *INDENT-ON* */ } /* * Call the user's event callback to report DHCP information */ if (c->event_callback) c->event_callback (c->client_index, c); } /* * 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; /* Packet not for us? Turf it... */ if (memcmp (dhcp->client_hardware_address, c->client_hardware_address, sizeof (c->client_hardware_address))) { vlib_node_increment_counter (vm, dhcp_client_process_node.index, DHCP_STAT_NOT_FOR_US, 1); 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]); // for debug: lease_time_in_seconds = 20; /*$$$$*/ c->lease_expires = now + (f64) lease_time_in_seconds; c->lease_lifetime = lease_time_in_seconds; /* Set a sensible default, in case we don't get opt 58 */ c->lease_renewal_interval = lease_time_in_seconds / 2; } break; case 58: /* lease renew time in seconds */ { u32 lease_renew_time_in_seconds = clib_host_to_net_u32 (o->data_as_u32[0]); c->lease_renewal_interval = lease_renew_time_in_seconds; } break; case 54: /* dhcp server address */ c->dhcp_server.as_u32 = o->data_as_u32[0]; break; case 1: /* subnet mask */ { u32 subnet_mask = clib_host_to_net_u32 (o->data_as_u32[0]); c->subnet_mask_width = count_set_bits (subnet_mask); } break; case 3: /* router address */ { u32 router_address = o->data_as_u32[0]; c->router_address.as_u32 = router_address; } break; case 12: /* hostname */ { /* Replace the existing hostname if necessary */ vec_free (c->hostname); vec_validate (c->hostname, o->length - 1); clib_memcpy (c->hostname, o->data, o->length); } break; /* $$$$ 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) { vlib_node_increment_counter (vm, dhcp_client_process_node.index, DHCP_STAT_NON_OFFER_DISCOVER, 1); c->next_transmit = now + 5.0; break; } /* 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_NAK) { vlib_node_increment_counter (vm, dhcp_client_process_node.index, DHCP_STAT_NAK, 1); /* Probably never happens in bound state, but anyhow... */ if (c->state == DHCP_BOUND) { ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index, (void *) &c->leased_address, c->subnet_mask_width, 1 /*is_del */ ); vnet_feature_enable_disable ("ip4-unicast", "ip4-dhcp-client-detect", c->sw_if_index, 1 /* enable */ , 0, 0); c->client_detect_feature_enabled = 1; } /* Wipe out any memory of the address we had... */ c->state = DHCP_DISCOVER; c->next_transmit = now; c->retry_count = 0; 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; break; } if (dhcp_message_type != DHCP_PACKET_ACK && dhcp_message_type != DHCP_PACKET_OFFER) { vlib_node_increment_counter (vm, dhcp_client_process_node.index, DHCP_STAT_NON_OFFER_DISCOVER, 1); 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) */ vl_api_rpc_call_main_thread (dhcp_client_addr_callback, (u8 *) c, sizeof (*c)); 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; vlib_node_increment_counter (vm, dhcp_client_process_node.index, DHCP_STAT_BOUND, 1); 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; u32 counter_index; /* 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 */ clib_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); /* And remember it for rx-packet-for-us checking */ clib_memcpy (c->client_hardware_address, dhcp->client_hardware_address, sizeof (c->client_hardware_address)); /* 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 && c->set_broadcast_flag ? 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); switch (type) { #define _(a,b) case DHCP_PACKET_##a: {counter_index = DHCP_STAT_##a; break;} foreach_dhcp_sent_packet_stat #undef _ default: counter_index = DHCP_STAT_UNKNOWN; break; } vlib_node_increment_counter (vm, dhcp_client_process_node.index, counter_index, 1); } 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. */ if (c->client_detect_feature_enabled == 0) { vnet_feature_enable_disable ("ip4-unicast", "ip4-dhcp-client-detect", c->sw_if_index, 1 /* enable */ , 0, 0); c->client_detect_feature_enabled = 1; } 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 to renew * the lease. * Eventually, when the lease expires, forget the dhcp data * and go back to the stone age. */ /* * We disable the client detect feature when we bind a * DHCP address. Turn it back on again on first renew attempt. * Otherwise, if the DHCP server replies we'll never see it. */ if (c->client_detect_feature_enabled == 0) { vnet_feature_enable_disable ("ip4-unicast", "ip4-dhcp-client-detect", c->sw_if_index, 1 /* enable */ , 0, 0); c->client_detect_feature_enabled = 1; } 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) { /* Remove the default 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_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); } /* Remove the interface address */ 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: /* *INDENT-OFF* */ pool_foreach (c, dcm->clients, ({ timeout = dhcp_client_sm (now, timeout, (uword) (c - dcm->clients)); })); /* *INDENT-ON* */ if (pool_elts (dcm->clients) == 0) timeout = 100.0; break; } vec_reset_length (event_data); } /* NOTREACHED */ return 0; } /* *INDENT-OFF* */ 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, .n_errors = ARRAY_LEN(dhcp_client_process_stat_strings), .error_strings = dhcp_client_process_stat_strings, }; /* *INDENT-ON* */ 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; } /* *INDENT-OFF* */ pool_foreach (c, dcm->clients, ({ vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose); })); /* *INDENT-ON* */ return 0; } /* *INDENT-OFF* */ 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, }; /* *INDENT-ON* */ 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_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) { dhcp_maybe_register_udp_ports (); pool_get (dcm->clients, c); clib_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; c->set_broadcast_flag = a->set_broadcast_flag; 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); /* * In order to accept any OFFER, whether broadcasted or unicasted, we * need to configure the dhcp-client-detect feature as an input feature * so the DHCP OFFER is sent to the ip4-local node. Without this a * broadcasted OFFER hits the 255.255.255.255/32 address and a unicast * hits 0.0.0.0/0 both of which default to drop and the latter may forward * of box - not what we want. Nor to we want to change these route for * all interfaces in this table */ vnet_feature_enable_disable ("ip4-unicast", "ip4-dhcp-client-detect", c->sw_if_index, 1 /* enable */ , 0, 0); c->client_detect_feature_enabled = 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]); 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_release_address (dcm, c); 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 (u32 is_add, u32 client_index, vlib_main_t * vm, u32 sw_if_index, u8 * hostname, u8 * client_id, dhcp_event_cb_t event_callback, u8 set_broadcast_flag, u32 pid) { dhcp_client_add_del_args_t _a, *a = &_a; int rv; clib_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; a->set_broadcast_flag = set_broadcast_flag; 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; } void dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx) { dhcp_client_main_t *dcm = &dhcp_client_main; dhcp_client_t *c; /* *INDENT-OFF* */ pool_foreach (c, dcm->clients, ({ if (!cb(c, ctx)) break; })); /* *INDENT-ON* */ } 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; u8 set_broadcast_flag = 1; 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 if (unformat (input, "broadcast", &set_broadcast_flag)) is_add = 0; else break; } if (sw_if_index_set == 0) return clib_error_return (0, "interface not specified"); clib_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); a->set_broadcast_flag = set_broadcast_flag; /* * 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; } /* *INDENT-OFF* */ 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, }; /* *INDENT-ON* */ 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); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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