diff options
Diffstat (limited to 'src/vnet/dns')
| -rw-r--r-- | src/vnet/dns/dns.api | 103 | ||||
| -rw-r--r-- | src/vnet/dns/dns.c | 3012 | ||||
| -rw-r--r-- | src/vnet/dns/dns.h | 221 | ||||
| -rw-r--r-- | src/vnet/dns/dns_packet.h | 156 | ||||
| -rw-r--r-- | src/vnet/dns/reply_node.c | 227 | ||||
| -rw-r--r-- | src/vnet/dns/request_node.c | 344 | ||||
| -rw-r--r-- | src/vnet/dns/resolver_process.c | 378 |
7 files changed, 0 insertions, 4441 deletions
diff --git a/src/vnet/dns/dns.api b/src/vnet/dns/dns.api deleted file mode 100644 index 4045b8111c4..00000000000 --- a/src/vnet/dns/dns.api +++ /dev/null @@ -1,103 +0,0 @@ -/* - * Copyright (c) 2017 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. - */ - -option version = "1.0.0"; - -/** \brief enable/disable name resolution - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param is_enable - 1 = enable, 0 = disable -*/ -autoreply define dns_enable_disable { - u32 client_index; - u32 context; - u8 enable; -}; - -/** \brief add or delete an upstream name server - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param is_ip6 - an ip6 name server - @param is_add - add = 1, delete = 0 - @param server_address - server ip address -*/ -autoreply define dns_name_server_add_del { - u32 client_index; - u32 context; - u8 is_ip6; - u8 is_add; - u8 server_address[16]; -}; - -/** \brief DNS name resolution request - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param name - the name to resolve -*/ -define dns_resolve_name { - u32 client_index; - u32 context; - u8 name[256]; - }; - -/** \brief DNS name resolution reply - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param retval - return value, 0 => success - @param ip4_set - indicates that the ip4 address is valid - @param ip6_set - indicates that the ip6 address is valid - @param ip4_address - the ip4 name resolution reply - @param ip6_address - the ip6 name resolution reply -*/ -define dns_resolve_name_reply { - u32 context; - i32 retval; - u8 ip4_set; - u8 ip6_set; - u8 ip4_address[4]; - u8 ip6_address[16]; -}; - -/** \brief DNS IP -> name resolution request - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param is_ip6 - set if the reverse-DNS request is an ip6 address - @param address - the address to map to a name -*/ -define dns_resolve_ip { - u32 client_index; - u32 context; - u8 is_ip6; - u8 address[16]; - }; - -/** \brief DNS ip->name resolution reply - - @param client_index - opaque cookie to identify the sender - @param context - sender context, to match reply w/ request - @param retval - return value, 0 => success - @param name - canonical name for the indicated IP address -*/ -define dns_resolve_ip_reply { - u32 context; - i32 retval; - u8 name[256]; -}; - diff --git a/src/vnet/dns/dns.c b/src/vnet/dns/dns.c deleted file mode 100644 index eac95450485..00000000000 --- a/src/vnet/dns/dns.c +++ /dev/null @@ -1,3012 +0,0 @@ -/* - * Copyright (c) 2017 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 <vnet/dns/dns.h> - -#include <vnet/vnet.h> -#include <vnet/fib/fib.h> -#include <vlibmemory/api.h> - -#include <vnet/udp/udp.h> - -#include <vnet/vnet_msg_enum.h> - -#define vl_typedefs /* define message structures */ -#include <vnet/vnet_all_api_h.h> -#undef vl_typedefs - -#define vl_endianfun /* define message structures */ -#include <vnet/vnet_all_api_h.h> -#undef vl_endianfun - -/* instantiate all the print functions we know about */ -#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__) -#define vl_printfun -#include <vnet/vnet_all_api_h.h> -#undef vl_printfun - -#include <vlibapi/api_helper_macros.h> - -dns_main_t dns_main; - -static int -dns_cache_clear (dns_main_t * dm) -{ - dns_cache_entry_t *ep; - - if (dm->is_enabled == 0) - return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED; - - dns_cache_lock (dm); - - /* *INDENT-OFF* */ - pool_foreach (ep, dm->entries, - ({ - vec_free (ep->name); - vec_free (ep->pending_requests); - })); - /* *INDENT-ON* */ - - pool_free (dm->entries); - hash_free (dm->cache_entry_by_name); - dm->cache_entry_by_name = hash_create_string (0, sizeof (uword)); - vec_free (dm->unresolved_entries); - dns_cache_unlock (dm); - return 0; -} - -static int -dns_enable_disable (dns_main_t * dm, int is_enable) -{ - vlib_thread_main_t *tm = &vlib_thread_main; - u32 n_vlib_mains = tm->n_vlib_mains; - vlib_main_t *vm = dm->vlib_main; - - /* Create the resolver process if not done already */ - vnet_dns_create_resolver_process (dm); - - if (is_enable) - { - if (vec_len (dm->ip4_name_servers) == 0 - && (vec_len (dm->ip6_name_servers) == 0)) - return VNET_API_ERROR_NO_NAME_SERVERS; - - if (dm->udp_ports_registered == 0) - { - udp_register_dst_port (vm, UDP_DST_PORT_dns_reply, - dns46_reply_node.index, 1 /* is_ip4 */ ); - - udp_register_dst_port (vm, UDP_DST_PORT_dns_reply6, - dns46_reply_node.index, 0 /* is_ip4 */ ); - - udp_register_dst_port (vm, UDP_DST_PORT_dns, - dns4_request_node.index, 1 /* is_ip4 */ ); - - udp_register_dst_port (vm, UDP_DST_PORT_dns6, - dns6_request_node.index, 0 /* is_ip4 */ ); - - dm->udp_ports_registered = 1; - } - - if (dm->cache_entry_by_name == 0) - { - if (n_vlib_mains > 1) - clib_spinlock_init (&dm->cache_lock); - - dm->cache_entry_by_name = hash_create_string (0, sizeof (uword)); - } - - dm->is_enabled = 1; - } - else - { - dns_cache_clear (dm); - dm->is_enabled = 0; - } - return 0; -} - -static void vl_api_dns_enable_disable_t_handler - (vl_api_dns_enable_disable_t * mp) -{ - vl_api_dns_enable_disable_reply_t *rmp; - dns_main_t *dm = &dns_main; - int rv; - - rv = dns_enable_disable (dm, mp->enable); - - REPLY_MACRO (VL_API_DNS_ENABLE_DISABLE_REPLY); -} - -static int -dns6_name_server_add_del (dns_main_t * dm, - u8 * server_address_as_u8, int is_add) -{ - int i; - ip6_address_t *ap; - - if (is_add) - { - /* Already there? done... */ - for (i = 0; i < vec_len (dm->ip6_name_servers); i++) - { - if (!memcmp (dm->ip6_name_servers + i, server_address_as_u8, - sizeof (ip6_address_t))) - return 0; - } - - vec_add2 (dm->ip6_name_servers, ap, 1); - clib_memcpy (ap, server_address_as_u8, sizeof (*ap)); - } - else - { - for (i = 0; i < vec_len (dm->ip6_name_servers); i++) - { - if (!memcmp (dm->ip6_name_servers + i, server_address_as_u8, - sizeof (ip6_address_t))) - { - vec_delete (dm->ip6_name_servers, 1, i); - return 0; - } - } - return VNET_API_ERROR_NAME_SERVER_NOT_FOUND; - } - return 0; -} - -static int -dns4_name_server_add_del (dns_main_t * dm, - u8 * server_address_as_u8, int is_add) -{ - int i; - ip4_address_t *ap; - - if (is_add) - { - /* Already there? done... */ - for (i = 0; i < vec_len (dm->ip4_name_servers); i++) - { - if (!memcmp (dm->ip4_name_servers + i, server_address_as_u8, - sizeof (ip4_address_t))) - return 0; - } - - vec_add2 (dm->ip4_name_servers, ap, 1); - clib_memcpy (ap, server_address_as_u8, sizeof (*ap)); - } - else - { - for (i = 0; i < vec_len (dm->ip4_name_servers); i++) - { - if (!memcmp (dm->ip4_name_servers + i, server_address_as_u8, - sizeof (ip4_address_t))) - { - vec_delete (dm->ip4_name_servers, 1, i); - return 0; - } - } - return VNET_API_ERROR_NAME_SERVER_NOT_FOUND; - } - return 0; -} - -static void vl_api_dns_name_server_add_del_t_handler - (vl_api_dns_name_server_add_del_t * mp) -{ - dns_main_t *dm = &dns_main; - vl_api_dns_name_server_add_del_reply_t *rmp; - int rv; - - if (mp->is_ip6) - rv = dns6_name_server_add_del (dm, mp->server_address, mp->is_add); - else - rv = dns4_name_server_add_del (dm, mp->server_address, mp->is_add); - - REPLY_MACRO (VL_API_DNS_NAME_SERVER_ADD_DEL_REPLY); -} - -void -vnet_dns_send_dns4_request (dns_main_t * dm, - dns_cache_entry_t * ep, ip4_address_t * server) -{ - vlib_main_t *vm = dm->vlib_main; - f64 now = vlib_time_now (vm); - u32 bi; - vlib_buffer_t *b; - ip4_header_t *ip; - fib_prefix_t prefix; - fib_node_index_t fei; - u32 sw_if_index, fib_index; - udp_header_t *udp; - ip4_main_t *im4 = &ip4_main; - ip_lookup_main_t *lm4 = &im4->lookup_main; - ip_interface_address_t *ia = 0; - ip4_address_t *src_address; - u8 *dns_request; - vlib_frame_t *f; - u32 *to_next; - - ASSERT (ep->dns_request); - - /* Find a FIB path to the server */ - clib_memcpy (&prefix.fp_addr.ip4, server, sizeof (*server)); - prefix.fp_proto = FIB_PROTOCOL_IP4; - prefix.fp_len = 32; - - fib_index = fib_table_find (prefix.fp_proto, 0 /* default VRF for now */ ); - if (fib_index == (u32) ~ 0) - { - if (0) - clib_warning ("no fib table"); - return; - } - - fei = fib_table_lookup (fib_index, &prefix); - - /* Couldn't find route to destination. Bail out. */ - if (fei == FIB_NODE_INDEX_INVALID) - { - if (0) - clib_warning ("no route to DNS server"); - return; - } - - sw_if_index = fib_entry_get_resolving_interface (fei); - - if (sw_if_index == ~0) - { - if (0) - clib_warning - ("route to %U exists, fei %d, get_resolving_interface returned" - " ~0", format_ip4_address, &prefix.fp_addr, fei); - return; - } - - /* *INDENT-OFF* */ - foreach_ip_interface_address(lm4, ia, sw_if_index, 1 /* honor unnumbered */, - ({ - src_address = ip_interface_address_get_address (lm4, ia); - goto found_src_address; - })); - /* *INDENT-ON* */ - - clib_warning ("FIB BUG"); - return; - -found_src_address: - - /* Go get a buffer */ - if (vlib_buffer_alloc (dm->vlib_main, &bi, 1) != 1) - return; - - b = vlib_get_buffer (vm, bi); - b->current_length = sizeof (ip4_header_t) + sizeof (udp_header_t) + - vec_len (ep->dns_request); - b->total_length_not_including_first_buffer = 0; - b->flags = - VLIB_BUFFER_TOTAL_LENGTH_VALID | VNET_BUFFER_F_LOCALLY_ORIGINATED; - vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; /* "local0" */ - vnet_buffer (b)->sw_if_index[VLIB_TX] = 0; /* default VRF for now */ - - ip = vlib_buffer_get_current (b); - clib_memset (ip, 0, sizeof (*ip)); - udp = (udp_header_t *) (ip + 1); - clib_memset (udp, 0, sizeof (*udp)); - - dns_request = (u8 *) (udp + 1); - - /* IP header */ - ip->ip_version_and_header_length = 0x45; - ip->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b)); - ip->ttl = 255; - ip->protocol = IP_PROTOCOL_UDP; - ip->src_address.as_u32 = src_address->as_u32; - ip->dst_address.as_u32 = server->as_u32; - ip->checksum = ip4_header_checksum (ip); - - /* UDP header */ - udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dns_reply); - udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dns); - udp->length = clib_host_to_net_u16 (sizeof (udp_header_t) + - vec_len (ep->dns_request)); - udp->checksum = 0; - - /* The actual DNS request */ - clib_memcpy (dns_request, ep->dns_request, vec_len (ep->dns_request)); - - /* Ship it to ip4_lookup */ - f = vlib_get_frame_to_node (vm, ip4_lookup_node.index); - to_next = vlib_frame_vector_args (f); - to_next[0] = bi; - f->n_vectors = 1; - vlib_put_frame_to_node (vm, ip4_lookup_node.index, f); - - ep->retry_timer = now + 2.0; -} - -void -vnet_dns_send_dns6_request (dns_main_t * dm, - dns_cache_entry_t * ep, ip6_address_t * server) -{ - vlib_main_t *vm = dm->vlib_main; - f64 now = vlib_time_now (vm); - u32 bi; - vlib_buffer_t *b; - ip6_header_t *ip; - fib_prefix_t prefix; - fib_node_index_t fei; - u32 sw_if_index, fib_index; - udp_header_t *udp; - ip6_main_t *im6 = &ip6_main; - ip_lookup_main_t *lm6 = &im6->lookup_main; - ip_interface_address_t *ia = 0; - ip6_address_t *src_address; - u8 *dns_request; - vlib_frame_t *f; - u32 *to_next; - int junk __attribute__ ((unused)); - - ASSERT (ep->dns_request); - - /* Find a FIB path to the server */ - clib_memcpy (&prefix.fp_addr, server, sizeof (*server)); - prefix.fp_proto = FIB_PROTOCOL_IP6; - prefix.fp_len = 32; - - fib_index = fib_table_find (prefix.fp_proto, 0 /* default VRF for now */ ); - if (fib_index == (u32) ~ 0) - { - if (0) - clib_warning ("no fib table"); - return; - } - - fei = fib_table_lookup (fib_index, &prefix); - - /* Couldn't find route to destination. Bail out. */ - if (fei == FIB_NODE_INDEX_INVALID) - { - clib_warning ("no route to DNS server"); - } - - sw_if_index = fib_entry_get_resolving_interface (fei); - - /* *INDENT-OFF* */ - foreach_ip_interface_address(lm6, ia, sw_if_index, 1 /* honor unnumbered */, - ({ - src_address = ip_interface_address_get_address (lm6, ia); - goto found_src_address; - })); - /* *INDENT-ON* */ - - clib_warning ("FIB BUG"); - return; - -found_src_address: - - /* Go get a buffer */ - if (vlib_buffer_alloc (dm->vlib_main, &bi, 1) != 1) - return; - - b = vlib_get_buffer (vm, bi); - b->current_length = sizeof (ip6_header_t) + sizeof (udp_header_t) + - vec_len (ep->dns_request); - b->total_length_not_including_first_buffer = 0; - b->flags = - VLIB_BUFFER_TOTAL_LENGTH_VALID | VNET_BUFFER_F_LOCALLY_ORIGINATED; - - ip = vlib_buffer_get_current (b); - clib_memset (ip, 0, sizeof (*ip)); - udp = (udp_header_t *) (ip + 1); - clib_memset (udp, 0, sizeof (*udp)); - - dns_request = (u8 *) (udp + 1); - - /* IP header */ - ip->ip_version_traffic_class_and_flow_label = - clib_host_to_net_u32 (0x6 << 28); - - ip->payload_length = - clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b) - - sizeof (ip6_header_t)); - ip->hop_limit = 255; - ip->protocol = IP_PROTOCOL_UDP; - clib_memcpy (&ip->src_address, src_address, sizeof (ip6_address_t)); - clib_memcpy (&ip->dst_address, server, sizeof (ip6_address_t)); - - /* UDP header */ - udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dns_reply); - udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dns); - udp->length = clib_host_to_net_u16 (sizeof (udp_header_t) + - vec_len (ep->dns_request)); - udp->checksum = 0; - udp->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip, &junk); - - /* The actual DNS request */ - clib_memcpy (dns_request, ep->dns_request, vec_len (ep->dns_request)); - - /* Ship it to ip6_lookup */ - f = vlib_get_frame_to_node (vm, ip6_lookup_node.index); - to_next = vlib_frame_vector_args (f); - to_next[0] = bi; - f->n_vectors = 1; - - ep->retry_timer = now + 2.0; -} - -/** - * Translate "foo.com" into "0x3 f o o 0x3 c o m 0x0" - * A historical / hysterical micro-TLV scheme. DGMS. - */ -u8 * -name_to_labels (u8 * name) -{ - int i; - int last_label_index; - u8 *rv; - - rv = vec_dup (name); - - /* punch in space for the first length */ - vec_insert (rv, 1, 0); - last_label_index = 0; - i = 1; - - while (i < vec_len (rv)) - { - if (rv[i] == '.') - { - rv[last_label_index] = (i - last_label_index) - 1; - if ((i - last_label_index) > 63) - clib_warning ("stupid name, label length %d", - i - last_label_index); - last_label_index = i; - rv[i] = 0; - } - i++; - } - /* Set the last real label length */ - rv[last_label_index] = (i - last_label_index) - 1; - - /* - * Add a [sic] NULL root label. Otherwise, the name parser can't figure out - * where to stop. - */ - vec_add1 (rv, 0); - return rv; -} - -/** - * arc-function for the above. - * Translate "0x3 f o o 0x3 c o m 0x0" into "foo.com" - * Produces a non-NULL-terminated u8 *vector. %v format is your friend. - */ -u8 * -vnet_dns_labels_to_name (u8 * label, u8 * full_text, u8 ** parse_from_here) -{ - u8 *reply = 0; - u16 offset; - u8 len; - int i; - - *parse_from_here = 0; - - /* chase initial pointer? */ - if ((label[0] & 0xC0) == 0xC0) - { - *parse_from_here = label + 2; - offset = ((label[0] & 0x3f) << 8) + label[1]; - label = full_text + offset; - } - - len = *label++; - - while (len) - { - for (i = 0; i < len; i++) - vec_add1 (reply, *label++); - - /* chase pointer? */ - if ((label[0] & 0xC0) == 0xC0) - { - *parse_from_here = label + 2; - offset = ((label[0] & 0x3f) << 8) + label[1]; - label = full_text + offset; - } - - len = *label++; - if (len) - vec_add1 (reply, '.'); - } - if (*parse_from_here == 0) - *parse_from_here = label; - return reply; -} - -void -vnet_send_dns_request (dns_main_t * dm, dns_cache_entry_t * ep) -{ - dns_header_t *h; - dns_query_t *qp; - u16 tmp; - u8 *request, *name_copy; - u32 qp_offset; - - /* This can easily happen if sitting in GDB, etc. */ - if (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID || ep->server_fails > 1) - return; - - /* Construct the dns request, if we haven't been here already */ - if (vec_len (ep->dns_request) == 0) - { - /* - * Start with the variadic portion of the exercise. - * Turn the name into a set of DNS "labels". Max length - * per label is 63, enforce that. - */ - request = name_to_labels (ep->name); - name_copy = vec_dup (request); - qp_offset = vec_len (request); - - /* - * At least when testing against "known good" DNS servers: - * it turns out that sending 2x requests - one for an A-record - * and another for a AAAA-record - seems to work better than - * sending a DNS_TYPE_ALL request. - */ - - /* Add space for the query header */ - vec_validate (request, 2 * qp_offset + 2 * sizeof (dns_query_t) - 1); - - qp = (dns_query_t *) (request + qp_offset); - - qp->type = clib_host_to_net_u16 (DNS_TYPE_A); - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - qp++; - clib_memcpy (qp, name_copy, vec_len (name_copy)); - qp = (dns_query_t *) (((u8 *) qp) + vec_len (name_copy)); - vec_free (name_copy); - - qp->type = clib_host_to_net_u16 (DNS_TYPE_AAAA); - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - - /* Punch in space for the dns_header_t */ - vec_insert (request, sizeof (dns_header_t), 0); - - h = (dns_header_t *) request; - - /* Transaction ID = pool index */ - h->id = clib_host_to_net_u16 (ep - dm->entries); - - /* Ask for a recursive lookup */ - tmp = DNS_RD | DNS_OPCODE_QUERY; - h->flags = clib_host_to_net_u16 (tmp); - h->qdcount = clib_host_to_net_u16 (2); - h->nscount = 0; - h->arcount = 0; - - ep->dns_request = request; - } - - /* Work out which server / address family we're going to use */ - - /* Retry using current server */ - if (ep->retry_count++ < DNS_RETRIES_PER_SERVER) - { - if (ep->server_af == 1 /* ip6 */ ) - { - if (vec_len (dm->ip6_name_servers)) - { - vnet_dns_send_dns6_request - (dm, ep, dm->ip6_name_servers + ep->server_rotor); - goto out; - } - else - ep->server_af = 0; - } - if (vec_len (dm->ip4_name_servers)) - { - vnet_dns_send_dns4_request - (dm, ep, dm->ip4_name_servers + ep->server_rotor); - goto out; - } - } - else /* switch to a new server */ - { - ep->retry_count = 1; - ep->server_rotor++; - if (ep->server_af == 1 /* ip6 */ ) - { - if (ep->server_rotor >= vec_len (dm->ip6_name_servers)) - { - ep->server_rotor = 0; - ep->server_af = vec_len (dm->ip4_name_servers) > 0 ? 0 : 1; - } - } - else - { - if (ep->server_rotor >= vec_len (dm->ip4_name_servers)) - { - ep->server_rotor = 0; - ep->server_af = vec_len (dm->ip6_name_servers) > 0 ? 1 : 0; - } - } - } - - if (ep->server_af == 1 /* ip6 */ ) - vnet_dns_send_dns6_request - (dm, ep, dm->ip6_name_servers + ep->server_rotor); - else - vnet_dns_send_dns4_request - (dm, ep, dm->ip4_name_servers + ep->server_rotor); - -out: - - vlib_process_signal_event_mt (dm->vlib_main, - dm->resolver_process_node_index, - DNS_RESOLVER_EVENT_PENDING, 0); -} - -int -vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index) -{ - dns_cache_entry_t *ep; - int i; - - if (dm->is_enabled == 0) - return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED; - - if (pool_is_free_index (dm->entries, index)) - return VNET_API_ERROR_NO_SUCH_ENTRY; - - ep = pool_elt_at_index (dm->entries, index); - if (!(ep->flags & DNS_CACHE_ENTRY_FLAG_VALID)) - { - for (i = 0; i < vec_len (dm->unresolved_entries); i++) - if (index == dm->unresolved_entries[i]) - { - vec_delete (dm->unresolved_entries, 1, i); - goto found; - } - clib_warning ("pool elt %d supposedly pending, but not found...", - index); - } - -found: - hash_unset_mem (dm->cache_entry_by_name, ep->name); - vec_free (ep->name); - vec_free (ep->pending_requests); - pool_put (dm->entries, ep); - - return 0; -} - -static int -dns_delete_by_name (dns_main_t * dm, u8 * name) -{ - int rv; - uword *p; - - if (dm->is_enabled == 0) - return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED; - - dns_cache_lock (dm); - p = hash_get_mem (dm->cache_entry_by_name, name); - if (!p) - { - dns_cache_unlock (dm); - return VNET_API_ERROR_NO_SUCH_ENTRY; - } - rv = vnet_dns_delete_entry_by_index_nolock (dm, p[0]); - - dns_cache_unlock (dm); - - return rv; -} - -static int -delete_random_entry (dns_main_t * dm) -{ - int rv; - u32 victim_index, start_index, i; - u32 limit; - dns_cache_entry_t *ep; - - if (dm->is_enabled == 0) - return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED; - - /* - * Silence spurious coverity warning. We know pool_elts >> 0, or - * we wouldn't be here... - */ -#ifdef __COVERITY__ - if (pool_elts (dm->entries) == 0) - return VNET_API_ERROR_UNSPECIFIED; -#endif - - dns_cache_lock (dm); - limit = pool_elts (dm->entries); - start_index = random_u32 (&dm->random_seed) % limit; - - for (i = 0; i < limit; i++) - { - victim_index = (start_index + i) % limit; - - if (!pool_is_free_index (dm->entries, victim_index)) - { - ep = pool_elt_at_index (dm->entries, victim_index); - /* Delete only valid, non-static entries */ - if ((ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) - && ((ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC) == 0)) - { - rv = vnet_dns_delete_entry_by_index_nolock (dm, victim_index); - dns_cache_unlock (dm); - return rv; - } - } - } - dns_cache_unlock (dm); - - clib_warning ("Couldn't find an entry to delete?"); - return VNET_API_ERROR_UNSPECIFIED; -} - -static int -dns_add_static_entry (dns_main_t * dm, u8 * name, u8 * dns_reply_data) -{ - dns_cache_entry_t *ep; - uword *p; - int rv; - - if (dm->is_enabled == 0) - return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED; - - dns_cache_lock (dm); - p = hash_get_mem (dm->cache_entry_by_name, name); - if (p) - { - dns_cache_unlock (dm); - return VNET_API_ERROR_ENTRY_ALREADY_EXISTS; - } - - if (pool_elts (dm->entries) == dm->name_cache_size) - { - /* Will only fail if the cache is totally filled w/ static entries... */ - rv = delete_random_entry (dm); - if (rv) - { - dns_cache_unlock (dm); - return rv; - } - } - - pool_get (dm->entries, ep); - clib_memset (ep, 0, sizeof (*ep)); - - /* Note: consumes the name vector */ - ep->name = name; - hash_set_mem (dm->cache_entry_by_name, ep->name, ep - dm->entries); - ep->flags = DNS_CACHE_ENTRY_FLAG_VALID | DNS_CACHE_ENTRY_FLAG_STATIC; - ep->dns_response = dns_reply_data; - - dns_cache_unlock (dm); - return 0; -} - -int -vnet_dns_resolve_name (dns_main_t * dm, u8 * name, dns_pending_request_t * t, - dns_cache_entry_t ** retp) -{ - dns_cache_entry_t *ep; - int rv; - f64 now; - uword *p; - dns_pending_request_t *pr; - int count; - - now = vlib_time_now (dm->vlib_main); - - /* In case we can't actually answer the question right now... */ - *retp = 0; - - dns_cache_lock (dm); -search_again: - p = hash_get_mem (dm->cache_entry_by_name, name); - if (p) - { - ep = pool_elt_at_index (dm->entries, p[0]); - if (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) - { - /* Has the entry expired? */ - if (((ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC) == 0) - && (now > ep->expiration_time)) - { - int i; - u32 *indices_to_delete = 0; - - /* - * Take out the rest of the resolution chain - * This isn't optimal, but it won't happen very often. - */ - while (ep) - { - if ((ep->flags & DNS_CACHE_ENTRY_FLAG_CNAME)) - { - vec_add1 (indices_to_delete, ep - dm->entries); - - p = hash_get_mem (dm->cache_entry_by_name, ep->cname); - if (!p) - break; - ep = pool_elt_at_index (dm->entries, p[0]); - } - else - { - vec_add1 (indices_to_delete, ep - dm->entries); - break; - } - } - for (i = 0; i < vec_len (indices_to_delete); i++) - { - /* Reenable to watch re-resolutions */ - if (0) - { - ep = pool_elt_at_index (dm->entries, - indices_to_delete[i]); - clib_warning ("Re-resolve %s", ep->name); - } - - vnet_dns_delete_entry_by_index_nolock - (dm, indices_to_delete[i]); - } - vec_free (indices_to_delete); - /* Yes, kill it... */ - goto re_resolve; - } - - if (ep->flags & DNS_CACHE_ENTRY_FLAG_CNAME) - { - name = ep->cname; - goto search_again; - } - - /* Note: caller must drop the lock! */ - *retp = ep; - return (0); - } - else - { - /* - * Resolution pending. Add request to the pending vector - * by copying the template request - */ - vec_add2 (ep->pending_requests, pr, 1); - memcpy (pr, t, sizeof (*pr)); - dns_cache_unlock (dm); - return (0); - } - } - -re_resolve: - if (pool_elts (dm->entries) == dm->name_cache_size) - { - /* Will only fail if the cache is totally filled w/ static entries... */ - rv = delete_random_entry (dm); - if (rv) - { - dns_cache_unlock (dm); - return rv; - } - } - - /* add new hash table entry */ - pool_get (dm->entries, ep); - clib_memset (ep, 0, sizeof (*ep)); - - ep->name = format (0, "%s%c", name, 0); - _vec_len (ep->name) = vec_len (ep->name) - 1; - - hash_set_mem (dm->cache_entry_by_name, ep->name, ep - dm->entries); - - vec_add1 (dm->unresolved_entries, ep - dm->entries); - vec_add2 (ep->pending_requests, pr, 1); - - pr->request_type = t->request_type; - - /* Remember details so we can reply later... */ - if (t->request_type == DNS_API_PENDING_NAME_TO_IP || - t->request_type == DNS_API_PENDING_IP_TO_NAME) - { - pr->client_index = t->client_index; - pr->client_context = t->client_context; - } - else - { - pr->client_index = ~0; - pr->is_ip6 = t->is_ip6; - pr->dst_port = t->dst_port; - pr->id = t->id; - pr->name = t->name; - if (t->is_ip6) - count = 16; - else - count = 4; - clib_memcpy (pr->dst_address, t->dst_address, count); - } - - vnet_send_dns_request (dm, ep); - dns_cache_unlock (dm); - return 0; -} - -#define foreach_notification_to_move \ -_(pending_requests) - -/** - * Handle cname indirection. JFC. Called with the cache locked. - * returns 0 if the reply is not a CNAME. - */ - -int -vnet_dns_cname_indirection_nolock (dns_main_t * dm, u32 ep_index, u8 * reply) -{ - dns_header_t *h; - dns_query_t *qp; - dns_rr_t *rr; - u8 *curpos; - u8 *pos, *pos2; - u8 *cname_pos = 0; - int len, i; - u8 *cname = 0; - u8 *request = 0; - u8 *name_copy; - u32 qp_offset; - u16 flags; - u16 rcode; - dns_cache_entry_t *ep, *next_ep; - f64 now; - - h = (dns_header_t *) reply; - flags = clib_net_to_host_u16 (h->flags); - rcode = flags & DNS_RCODE_MASK; - - /* See if the response is OK */ - switch (rcode) - { - case DNS_RCODE_NO_ERROR: - break; - - case DNS_RCODE_NAME_ERROR: - case DNS_RCODE_FORMAT_ERROR: - case DNS_RCODE_SERVER_FAILURE: - case DNS_RCODE_NOT_IMPLEMENTED: - case DNS_RCODE_REFUSED: - return -1; - } - - curpos = (u8 *) (h + 1); - pos = curpos; - len = *pos++; - - /* Skip the questions */ - for (i = 0; i < clib_net_to_host_u16 (h->qdcount); i++) - { - while (len) - { - pos += len; - len = *pos++; - } - pos += sizeof (dns_query_t); - } - pos2 = pos; - /* expect a pointer chase here for a CNAME record */ - if ((pos2[0] & 0xC0) == 0xC0) - pos += 2; - else - return 0; - - /* Walk the answer(s) to see what to do next */ - for (i = 0; i < clib_net_to_host_u16 (h->anscount); i++) - { - rr = (dns_rr_t *) pos; - switch (clib_net_to_host_u16 (rr->type)) - { - /* Real address record? Done.. */ - case DNS_TYPE_A: - case DNS_TYPE_AAAA: - return 0; - /* - * Maybe chase a CNAME pointer? - * It's not unheard-of for name-servers to return - * both CNAME and A/AAAA records... - */ - case DNS_TYPE_CNAME: - cname_pos = pos; - break; - - /* Some other junk, e.g. a nameserver... */ - default: - break; - } - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - /* Skip name... */ - if ((pos2[0] & 0xc0) == 0xc0) - pos += 2; - } - - /* Neither a CNAME nor a real address. Try another server */ - if (cname_pos == 0) - { - flags &= ~DNS_RCODE_MASK; - flags |= DNS_RCODE_NAME_ERROR; - h->flags = clib_host_to_net_u16 (flags); - return -1; - } - - /* This is a CNAME record, chase the name chain. */ - pos = cname_pos; - - /* The last request is no longer pending.. */ - for (i = 0; i < vec_len (dm->unresolved_entries); i++) - if (ep_index == dm->unresolved_entries[i]) - { - vec_delete (dm->unresolved_entries, 1, i); - goto found_last_request; - } - clib_warning ("pool elt %d supposedly pending, but not found...", ep_index); - return -1; - -found_last_request: - - now = vlib_time_now (dm->vlib_main); - cname = vnet_dns_labels_to_name (rr->rdata, reply, &pos2); - /* Save the cname */ - vec_add1 (cname, 0); - _vec_len (cname) -= 1; - ep = pool_elt_at_index (dm->entries, ep_index); - ep->cname = cname; - ep->flags |= (DNS_CACHE_ENTRY_FLAG_CNAME | DNS_CACHE_ENTRY_FLAG_VALID); - /* Save the response */ - if (ep->dns_response) - vec_free (ep->dns_response); - ep->dns_response = reply; - /* Set up expiration time */ - ep->expiration_time = now + clib_net_to_host_u32 (rr->ttl); - - pool_get (dm->entries, next_ep); - - /* Need to recompute ep post pool-get */ - ep = pool_elt_at_index (dm->entries, ep_index); - - clib_memset (next_ep, 0, sizeof (*next_ep)); - next_ep->name = vec_dup (cname); - vec_add1 (next_ep->name, 0); - _vec_len (next_ep->name) -= 1; - - hash_set_mem (dm->cache_entry_by_name, next_ep->name, - next_ep - dm->entries); - - /* Use the same server */ - next_ep->server_rotor = ep->server_rotor; - next_ep->server_af = ep->server_af; - - /* Move notification data to the next name in the chain */ -#define _(a) next_ep->a = ep->a; ep->a = 0; - foreach_notification_to_move; -#undef _ - - request = name_to_labels (cname); - name_copy = vec_dup (request); - - qp_offset = vec_len (request); - - /* Add space for the query header */ - vec_validate (request, 2 * qp_offset + 2 * sizeof (dns_query_t) - 1); - - qp = (dns_query_t *) (request + qp_offset); - - qp->type = clib_host_to_net_u16 (DNS_TYPE_A); - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - clib_memcpy (qp, name_copy, vec_len (name_copy)); - qp = (dns_query_t *) (((u8 *) qp) + vec_len (name_copy)); - vec_free (name_copy); - - qp->type = clib_host_to_net_u16 (DNS_TYPE_AAAA); - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - - /* Punch in space for the dns_header_t */ - vec_insert (request, sizeof (dns_header_t), 0); - - h = (dns_header_t *) request; - - /* Transaction ID = pool index */ - h->id = clib_host_to_net_u16 (next_ep - dm->entries); - - /* Ask for a recursive lookup */ - h->flags = clib_host_to_net_u16 (DNS_RD | DNS_OPCODE_QUERY); - h->qdcount = clib_host_to_net_u16 (2); - h->nscount = 0; - h->arcount = 0; - - next_ep->dns_request = request; - next_ep->retry_timer = now + 2.0; - next_ep->retry_count = 0; - - /* - * Enable this to watch recursive resolution happen... - * fformat (stdout, "%U", format_dns_reply, request, 2); - */ - - vec_add1 (dm->unresolved_entries, next_ep - dm->entries); - vnet_send_dns_request (dm, next_ep); - return (1); -} - -int -vnet_dns_response_to_reply (u8 * response, - vl_api_dns_resolve_name_reply_t * rmp, - u32 * min_ttlp) -{ - dns_header_t *h; - dns_query_t *qp; - dns_rr_t *rr; - int i, limit; - u8 len; - u8 *curpos, *pos, *pos2; - u16 flags; - u16 rcode; - u32 ttl; - int pointer_chase; - - h = (dns_header_t *) response; - flags = clib_net_to_host_u16 (h->flags); - rcode = flags & DNS_RCODE_MASK; - - /* See if the response is OK, etc. */ - switch (rcode) - { - default: - case DNS_RCODE_NO_ERROR: - break; - - case DNS_RCODE_NAME_ERROR: - case DNS_RCODE_FORMAT_ERROR: - return VNET_API_ERROR_NAME_SERVER_NO_SUCH_NAME; - - case DNS_RCODE_SERVER_FAILURE: - case DNS_RCODE_NOT_IMPLEMENTED: - case DNS_RCODE_REFUSED: - return VNET_API_ERROR_NAME_SERVER_NEXT_SERVER; - } - - /* No answers? Loser... */ - if (clib_net_to_host_u16 (h->anscount) < 1) - return VNET_API_ERROR_NAME_SERVER_NO_ADDRESSES; - - curpos = (u8 *) (h + 1); - - /* Skip the name we asked about */ - pos = curpos; - len = *pos++; - /* Should never happen, but stil... */ - if ((len & 0xC0) == 0xC0) - curpos += 2; - else - { - /* skip the name / label-set */ - while (len) - { - pos += len; - len = *pos++; - } - curpos = pos; - } - /* Skip queries */ - limit = clib_net_to_host_u16 (h->qdcount); - qp = (dns_query_t *) curpos; - qp += limit; - curpos = (u8 *) qp; - - /* Parse answers */ - limit = clib_net_to_host_u16 (h->anscount); - - for (i = 0; i < limit; i++) - { - pos = pos2 = curpos; - pointer_chase = 0; - - /* Expect pointer chases in the answer section... */ - if ((pos2[0] & 0xC0) == 0xC0) - { - pos = pos2 + 2; - pos2 = response + ((pos2[0] & 0x3f) << 8) + pos2[1]; - pointer_chase = 1; - } - - len = *pos2++; - - while (len) - { - pos2 += len; - if ((pos2[0] & 0xc0) == 0xc0) - { - /* - * If we've already done one pointer chase, - * do not move the pos pointer. - */ - if (pointer_chase == 0) - pos = pos2 + 2; - pos2 = response + ((pos2[0] & 0x3f) << 8) + pos2[1]; - len = *pos2++; - pointer_chase = 1; - } - else - len = *pos2++; - } - - if (pointer_chase == 0) - pos = pos2; - - rr = (dns_rr_t *) pos; - - switch (clib_net_to_host_u16 (rr->type)) - { - case DNS_TYPE_A: - /* Collect an ip4 address. Do not pass go. Do not collect $200 */ - memcpy (rmp->ip4_address, rr->rdata, sizeof (ip4_address_t)); - rmp->ip4_set = 1; - ttl = clib_net_to_host_u32 (rr->ttl); - if (min_ttlp && *min_ttlp > ttl) - *min_ttlp = ttl; - break; - case DNS_TYPE_AAAA: - /* Collect an ip6 address. Do not pass go. Do not collect $200 */ - memcpy (rmp->ip6_address, rr->rdata, sizeof (ip6_address_t)); - ttl = clib_net_to_host_u32 (rr->ttl); - if (min_ttlp && *min_ttlp > ttl) - *min_ttlp = ttl; - rmp->ip6_set = 1; - break; - - default: - break; - } - /* Might as well stop ASAP */ - if (rmp->ip4_set && rmp->ip6_set) - break; - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - curpos = pos; - } - - if ((rmp->ip4_set + rmp->ip6_set) == 0) - return VNET_API_ERROR_NAME_SERVER_NO_ADDRESSES; - return 0; -} - -int -vnet_dns_response_to_name (u8 * response, - vl_api_dns_resolve_ip_reply_t * rmp, - u32 * min_ttlp) -{ - dns_header_t *h; - dns_query_t *qp; - dns_rr_t *rr; - int i, limit; - u8 len; - u8 *curpos, *pos, *pos2; - u16 flags; - u16 rcode; - u8 *name; - u32 ttl; - u8 *junk __attribute__ ((unused)); - int name_set = 0; - int pointer_chase; - - h = (dns_header_t *) response; - flags = clib_net_to_host_u16 (h->flags); - rcode = flags & DNS_RCODE_MASK; - - /* See if the response is OK, etc. */ - switch (rcode) - { - default: - case DNS_RCODE_NO_ERROR: - break; - - case DNS_RCODE_NAME_ERROR: - case DNS_RCODE_FORMAT_ERROR: - return VNET_API_ERROR_NAME_SERVER_NO_SUCH_NAME; - - case DNS_RCODE_SERVER_FAILURE: - case DNS_RCODE_NOT_IMPLEMENTED: - case DNS_RCODE_REFUSED: - return VNET_API_ERROR_NAME_SERVER_NEXT_SERVER; - } - - /* No answers? Loser... */ - if (clib_net_to_host_u16 (h->anscount) < 1) - return VNET_API_ERROR_NAME_SERVER_NO_ADDRESSES; - - curpos = (u8 *) (h + 1); - - /* Skip the name we asked about */ - pos = curpos; - len = *pos++; - /* Should never happen, but stil... */ - if ((len & 0xC0) == 0xC0) - curpos += 2; - else - { - /* skip the name / label-set */ - while (len) - { - pos += len; - len = *pos++; - } - curpos = pos; - } - /* Skip queries */ - limit = clib_net_to_host_u16 (h->qdcount); - qp = (dns_query_t *) curpos; - qp += limit; - curpos = (u8 *) qp; - - /* Parse answers */ - limit = clib_net_to_host_u16 (h->anscount); - - for (i = 0; i < limit; i++) - { - pos = pos2 = curpos; - pointer_chase = 0; - - /* Expect pointer chases in the answer section... */ - if ((pos2[0] & 0xC0) == 0xC0) - { - pos = pos2 + 2; - pos2 = response + ((pos2[0] & 0x3f) << 8) + pos2[1]; - pointer_chase = 1; - } - - len = *pos2++; - - while (len) - { - pos2 += len; - if ((pos2[0] & 0xc0) == 0xc0) - { - /* - * If we've already done one pointer chase, - * do not move the pos pointer. - */ - if (pointer_chase == 0) - pos = pos2 + 2; - pos2 = response + ((pos2[0] & 0x3f) << 8) + pos2[1]; - len = *pos2++; - pointer_chase = 1; - } - else - len = *pos2++; - } - - if (pointer_chase == 0) - pos = pos2; - - rr = (dns_rr_t *) pos; - - switch (clib_net_to_host_u16 (rr->type)) - { - case DNS_TYPE_PTR: - name = vnet_dns_labels_to_name (rr->rdata, response, &junk); - memcpy (rmp->name, name, vec_len (name)); - ttl = clib_net_to_host_u32 (rr->ttl); - if (min_ttlp) - *min_ttlp = ttl; - rmp->name[vec_len (name)] = 0; - name_set = 1; - break; - default: - break; - } - /* Might as well stop ASAP */ - if (name_set == 1) - break; - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - curpos = pos; - } - - if (name_set == 0) - return VNET_API_ERROR_NAME_SERVER_NO_SUCH_NAME; - return 0; -} - -static void -vl_api_dns_resolve_name_t_handler (vl_api_dns_resolve_name_t * mp) -{ - dns_main_t *dm = &dns_main; - vl_api_dns_resolve_name_reply_t *rmp; - dns_cache_entry_t *ep; - dns_pending_request_t _t0, *t0 = &_t0; - int rv; - - /* Sanitize the name slightly */ - mp->name[ARRAY_LEN (mp->name) - 1] = 0; - - t0->request_type = DNS_API_PENDING_NAME_TO_IP; - t0->client_index = mp->client_index; - t0->client_context = mp->context; - - rv = vnet_dns_resolve_name (dm, mp->name, t0, &ep); - - /* Error, e.g. not enabled? Tell the user */ - if (rv < 0) - { - REPLY_MACRO (VL_API_DNS_RESOLVE_NAME_REPLY); - return; - } - - /* Resolution pending? Don't reply... */ - if (ep == 0) - return; - - /* *INDENT-OFF* */ - REPLY_MACRO2(VL_API_DNS_RESOLVE_NAME_REPLY, - ({ - rv = vnet_dns_response_to_reply (ep->dns_response, rmp, 0 /* ttl-ptr */); - rmp->retval = clib_host_to_net_u32 (rv); - })); - /* *INDENT-ON* */ - - /* - * dns_resolve_name leaves the cache locked when it returns - * a cached result, so unlock it here. - */ - dns_cache_unlock (dm); -} - -static void -vl_api_dns_resolve_ip_t_handler (vl_api_dns_resolve_ip_t * mp) -{ - dns_main_t *dm = &dns_main; - vl_api_dns_resolve_ip_reply_t *rmp; - dns_cache_entry_t *ep; - int rv; - int i, len; - u8 *lookup_name = 0; - u8 digit, nybble; - dns_pending_request_t _t0, *t0 = &_t0; - - if (mp->is_ip6) - { - for (i = 15; i >= 0; i--) - { - digit = mp->address[i]; - nybble = (digit & 0x0F); - if (nybble > 9) - vec_add1 (lookup_name, (nybble - 10) + 'a'); - else - vec_add1 (lookup_name, nybble + '0'); - vec_add1 (lookup_name, '.'); - nybble = (digit & 0xF0) >> 4; - if (nybble > 9) - vec_add1 (lookup_name, (nybble - 10) + 'a'); - else - vec_add1 (lookup_name, nybble + '0'); - vec_add1 (lookup_name, '.'); - } - len = vec_len (lookup_name); - vec_validate (lookup_name, len + 8); - memcpy (lookup_name + len, "ip6.arpa", 8); - } - else - { - for (i = 3; i >= 0; i--) - { - digit = mp->address[i]; - lookup_name = format (lookup_name, "%d.", digit); - } - lookup_name = format (lookup_name, "in-addr.arpa"); - } - - vec_add1 (lookup_name, 0); - - t0->request_type = DNS_API_PENDING_IP_TO_NAME; - t0->client_index = mp->client_index; - t0->client_context = mp->context; - - rv = vnet_dns_resolve_name (dm, lookup_name, t0, &ep); - - vec_free (lookup_name); - - /* Error, e.g. not enabled? Tell the user */ - if (rv < 0) - { - REPLY_MACRO (VL_API_DNS_RESOLVE_IP_REPLY); - return; - } - - /* Resolution pending? Don't reply... */ - if (ep == 0) - return; - - /* *INDENT-OFF* */ - REPLY_MACRO2(VL_API_DNS_RESOLVE_IP_REPLY, - ({ - rv = vnet_dns_response_to_name (ep->dns_response, rmp, 0 /* ttl-ptr */); - rmp->retval = clib_host_to_net_u32 (rv); - })); - /* *INDENT-ON* */ - - /* - * vnet_dns_resolve_name leaves the cache locked when it returns - * a cached result, so unlock it here. - */ - dns_cache_unlock (dm); -} - -#define vl_msg_name_crc_list -#include <vpp/api/vpe_all_api_h.h> -#undef vl_msg_name_crc_list - -static void -setup_message_id_table (api_main_t * am) -{ -#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id); - foreach_vl_msg_name_crc_dns; -#undef _ -} - -#define foreach_dns_api_msg \ -_(DNS_ENABLE_DISABLE, dns_enable_disable) \ -_(DNS_NAME_SERVER_ADD_DEL, dns_name_server_add_del) \ -_(DNS_RESOLVE_NAME, dns_resolve_name) \ -_(DNS_RESOLVE_IP, dns_resolve_ip) - -static clib_error_t * -dns_api_hookup (vlib_main_t * vm) -{ -#define _(N,n) \ - vl_msg_api_set_handlers(VL_API_##N, #n, \ - vl_api_##n##_t_handler, \ - vl_noop_handler, \ - vl_api_##n##_t_endian, \ - vl_api_##n##_t_print, \ - sizeof(vl_api_##n##_t), 1); - foreach_dns_api_msg; -#undef _ - - setup_message_id_table (&api_main); - return 0; -} - -VLIB_API_INIT_FUNCTION (dns_api_hookup); - - -static clib_error_t * -dns_config_fn (vlib_main_t * vm, unformat_input_t * input) -{ - dns_main_t *dm = &dns_main; - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "max-cache-size %u", &dm->name_cache_size)) - ; - else if (unformat (input, "max-ttl %u", &dm->max_ttl_in_seconds)) - ; - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - return 0; -} - -VLIB_CONFIG_FUNCTION (dns_config_fn, "dns"); - -static clib_error_t * -dns_init (vlib_main_t * vm) -{ - dns_main_t *dm = &dns_main; - - dm->vlib_main = vm; - dm->vnet_main = vnet_get_main (); - dm->name_cache_size = 65535; - dm->max_ttl_in_seconds = 86400; - dm->random_seed = 0xDEADDABE; - - return 0; -} - -VLIB_INIT_FUNCTION (dns_init); - -uword -unformat_dns_reply (unformat_input_t * input, va_list * args) -{ - u8 **result = va_arg (*args, u8 **); - u8 **namep = va_arg (*args, u8 **); - ip4_address_t a4; - ip6_address_t a6; - int a4_set = 0; - int a6_set = 0; - u8 *name; - int name_set = 0; - u8 *ce; - u32 qp_offset; - dns_header_t *h; - dns_query_t *qp; - dns_rr_t *rr; - u8 *rru8; - - if (unformat (input, "%v", &name)) - name_set = 1; - - if (unformat (input, "%U", unformat_ip4_address, &a4)) - { - a4_set = 1; - if (unformat (input, "%U", unformat_ip6_address, &a6)) - a6_set = 1; - } - - if (unformat (input, "%U", unformat_ip6_address, &a6)) - { - a6_set = 1; - if (unformat (input, "%U", unformat_ip4_address, &a6)) - a4_set = 1; - } - - /* Must have a name */ - if (!name_set) - return 0; - - /* Must have at least one address */ - if (!(a4_set + a6_set)) - return 0; - - /* Build a fake DNS cache entry string, one hemorrhoid at a time */ - ce = name_to_labels (name); - qp_offset = vec_len (ce); - - /* Add space for the query header */ - vec_validate (ce, qp_offset + sizeof (dns_query_t) - 1); - qp = (dns_query_t *) (ce + qp_offset); - - qp->type = clib_host_to_net_u16 (DNS_TYPE_ALL); - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - - /* Punch in space for the dns_header_t */ - vec_insert (ce, sizeof (dns_header_t), 0); - - h = (dns_header_t *) ce; - - /* Fake Transaction ID */ - h->id = 0xFFFF; - - h->flags = clib_host_to_net_u16 (DNS_RD | DNS_RA); - h->qdcount = clib_host_to_net_u16 (1); - h->anscount = clib_host_to_net_u16 (a4_set + a6_set); - h->nscount = 0; - h->arcount = 0; - - /* Now append one or two A/AAAA RR's... */ - if (a4_set) - { - /* Pointer to the name (DGMS) */ - vec_add1 (ce, 0xC0); - vec_add1 (ce, 0x0C); - vec_add2 (ce, rru8, sizeof (*rr) + 4); - rr = (void *) rru8; - rr->type = clib_host_to_net_u16 (DNS_TYPE_A); - rr->class = clib_host_to_net_u16 (DNS_CLASS_IN); - rr->ttl = clib_host_to_net_u32 (86400); - rr->rdlength = clib_host_to_net_u16 (4); - memcpy (rr->rdata, &a4, sizeof (a4)); - } - if (a6_set) - { - /* Pointer to the name (DGMS) */ - vec_add1 (ce, 0xC0); - vec_add1 (ce, 0x0C); - vec_add2 (ce, rru8, sizeof (*rr) + 16); - rr = (void *) rru8; - rr->type = clib_host_to_net_u16 (DNS_TYPE_AAAA); - rr->class = clib_host_to_net_u16 (DNS_CLASS_IN); - rr->ttl = clib_host_to_net_u32 (86400); - rr->rdlength = clib_host_to_net_u16 (16); - memcpy (rr->rdata, &a6, sizeof (a6)); - } - *result = ce; - if (namep) - *namep = name; - else - vec_free (name); - - return 1; -} - -u8 * -format_dns_query (u8 * s, va_list * args) -{ - u8 **curpos = va_arg (*args, u8 **); - int verbose = va_arg (*args, int); - u8 *pos; - dns_query_t *qp; - int len, i; - if (verbose > 1) - s = format (s, " Name: "); - - /* Unwind execrated counted-label sheit */ - pos = *curpos; - len = *pos++; - - while (len) - { - for (i = 0; i < len; i++) - vec_add1 (s, *pos++); - - len = *pos++; - if (len) - vec_add1 (s, '.'); - else - { - vec_add1 (s, ':'); - vec_add1 (s, ' '); - } - } - - qp = (dns_query_t *) pos; - if (verbose > 1) - { - switch (clib_net_to_host_u16 (qp->type)) - { - case DNS_TYPE_A: - s = format (s, "type A\n"); - break; - case DNS_TYPE_AAAA: - s = format (s, "type AAAA\n"); - break; - case DNS_TYPE_ALL: - s = format (s, "type ALL\n"); - break; - - default: - s = format (s, "type %d\n", clib_net_to_host_u16 (qp->type)); - break; - } - } - - pos += sizeof (*qp); - - *curpos = pos; - return s; -} - -/** - * format dns reply data - * verbose > 1, dump everything - * verbose == 1, dump all A and AAAA records - * verbose == 0, dump one A record, and one AAAA record - */ - -u8 * -format_dns_reply_data (u8 * s, va_list * args) -{ - u8 *reply = va_arg (*args, u8 *); - u8 **curpos = va_arg (*args, u8 **); - int verbose = va_arg (*args, int); - int *print_ip4 = va_arg (*args, int *); - int *print_ip6 = va_arg (*args, int *); - int len; - u8 *pos, *pos2; - dns_rr_t *rr; - int i; - int pointer_chase = 0; - u16 *tp; - u16 rrtype_host_byte_order; - - pos = pos2 = *curpos; - - if (verbose > 1) - s = format (s, " "); - - /* chase pointer? almost always yes here... */ - if ((pos2[0] & 0xc0) == 0xc0) - { - pos = pos2 + 2; - pos2 = reply + ((pos2[0] & 0x3f) << 8) + pos2[1]; - pointer_chase = 1; - } - - len = *pos2++; - - while (len) - { - for (i = 0; i < len; i++) - { - if (verbose > 1) - vec_add1 (s, *pos2); - pos2++; - } - if ((pos2[0] & 0xc0) == 0xc0) - { - /* - * If we've already done one pointer chase, - * do not move the pos pointer. - */ - if (pointer_chase == 0) - pos = pos2 + 2; - pos2 = reply + ((pos2[0] & 0x3f) << 8) + pos2[1]; - len = *pos2++; - pointer_chase = 1; - } - else - len = *pos2++; - if (len) - { - if (verbose > 1) - vec_add1 (s, '.'); - } - else - { - if (verbose > 1) - vec_add1 (s, ' '); - } - } - - if (pointer_chase == 0) - pos = pos2; - - rr = (dns_rr_t *) pos; - rrtype_host_byte_order = clib_net_to_host_u16 (rr->type); - - switch (rrtype_host_byte_order) - { - case DNS_TYPE_A: - if (verbose > 1) - { - s = format (s, "A: ttl %d %U\n", clib_net_to_host_u32 (rr->ttl), - format_ip4_address, rr->rdata); - } - else - { - if (*print_ip4) - s = format (s, "%U [%u] ", format_ip4_address, rr->rdata, - clib_net_to_host_u32 (rr->ttl)); - if (verbose == 0) - *print_ip4 = 0; - - } - pos += sizeof (*rr) + 4; - break; - - case DNS_TYPE_AAAA: - if (verbose > 1) - { - s = format (s, "AAAA: ttl %d %U\n", clib_net_to_host_u32 (rr->ttl), - format_ip6_address, rr->rdata); - } - else - { - if (*print_ip6) - s = format (s, "%U [%u] ", format_ip6_address, rr->rdata, - clib_net_to_host_u32 (rr->ttl)); - if (verbose == 0) - *print_ip6 = 0; - } - pos += sizeof (*rr) + 16; - break; - - case DNS_TYPE_TEXT: - if (verbose > 1) - { - s = format (s, "TEXT: "); - for (i = 0; i < clib_net_to_host_u16 (rr->rdlength); i++) - vec_add1 (s, rr->rdata[i]); - vec_add1 (s, '\n'); - } - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - - case DNS_TYPE_HINFO: - { - /* Two counted strings. DGMS */ - u8 *len; - u8 *curpos; - int i; - if (verbose > 1) - { - s = format (s, "HINFO: "); - len = rr->rdata; - curpos = len + 1; - for (i = 0; i < *len; i++) - vec_add1 (s, *curpos++); - - vec_add1 (s, ' '); - len = curpos++; - for (i = 0; i < *len; i++) - vec_add1 (s, *curpos++); - - vec_add1 (s, '\n'); - } - } - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - - case DNS_TYPE_NAMESERVER: - if (verbose > 1) - { - s = format (s, "Nameserver: "); - pos2 = rr->rdata; - - /* chase pointer? */ - if ((pos2[0] & 0xc0) == 0xc0) - { - pos = pos2 + 2; - pos2 = reply + ((pos2[0] & 0x3f) << 8) + pos2[1]; - } - - len = *pos2++; - - while (len) - { - for (i = 0; i < len; i++) - vec_add1 (s, *pos2++); - - /* chase pointer, typically to offset 12... */ - if (pos2[0] == 0xC0) - pos2 = reply + pos2[1]; - - len = *pos2++; - if (len) - vec_add1 (s, '.'); - else - vec_add1 (s, '\n'); - } - } - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - - case DNS_TYPE_MAIL_EXCHANGE: - if (verbose > 1) - { - tp = (u16 *) rr->rdata; - - s = format (s, "Mail Exchange: Preference %d ", (u32) - clib_net_to_host_u16 (*tp)); - - pos2 = rr->rdata + 2; - - /* chase pointer? */ - if (pos2[0] == 0xc0) - pos2 = reply + pos2[1]; - - len = *pos2++; - - while (len) - { - for (i = 0; i < len; i++) - vec_add1 (s, *pos2++); - - /* chase pointer */ - if (pos2[0] == 0xC0) - pos2 = reply + pos2[1]; - - len = *pos2++; - if (len) - vec_add1 (s, '.'); - else - vec_add1 (s, '\n'); - } - } - - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - - case DNS_TYPE_PTR: - case DNS_TYPE_CNAME: - if (verbose > 1) - { - tp = (u16 *) rr->rdata; - - if (rrtype_host_byte_order == DNS_TYPE_CNAME) - s = format (s, "CNAME: "); - else - s = format (s, "PTR: "); - - pos2 = rr->rdata; - - /* chase pointer? */ - if (pos2[0] == 0xc0) - pos2 = reply + pos2[1]; - - len = *pos2++; - - while (len) - { - for (i = 0; i < len; i++) - vec_add1 (s, *pos2++); - - /* chase pointer */ - if (pos2[0] == 0xC0) - pos2 = reply + pos2[1]; - - len = *pos2++; - if (len) - vec_add1 (s, '.'); - else - vec_add1 (s, '\n'); - } - } - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - - default: - if (verbose > 1) - s = format (s, "type %d: len %d\n", - (int) clib_net_to_host_u16 (rr->type), - sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength)); - pos += sizeof (*rr) + clib_net_to_host_u16 (rr->rdlength); - break; - } - - *curpos = pos; - - return s; -} - -u8 * -format_dns_reply (u8 * s, va_list * args) -{ - u8 *reply_as_u8 = va_arg (*args, u8 *); - int verbose = va_arg (*args, int); - dns_header_t *h; - u16 id, flags; - u8 *curpos; - int i; - int print_ip4 = 1; - int print_ip6 = 1; - - h = (dns_header_t *) reply_as_u8; - id = clib_net_to_host_u16 (h->id); - flags = clib_net_to_host_u16 (h->flags); - - if (verbose > 1) - { - s = format (s, "DNS %s: id %d\n", (flags & DNS_QR) ? "reply" : "query", - id); - s = format (s, " %s %s %s %s\n", - (flags & DNS_RA) ? "recur" : "no-recur", - (flags & DNS_RD) ? "recur-des" : "no-recur-des", - (flags & DNS_TC) ? "trunc" : "no-trunc", - (flags & DNS_AA) ? "auth" : "non-auth"); - s = format (s, " %d queries, %d answers, %d name-servers," - " %d add'l recs\n", - clib_net_to_host_u16 (h->qdcount), - clib_net_to_host_u16 (h->anscount), - clib_net_to_host_u16 (h->nscount), - clib_net_to_host_u16 (h->arcount)); - } - - curpos = (u8 *) (h + 1); - - if (h->qdcount) - { - if (verbose > 1) - s = format (s, " Queries:\n"); - for (i = 0; i < clib_net_to_host_u16 (h->qdcount); i++) - { - /* The query is variable-length, so curpos is a value-result parm */ - s = format (s, "%U", format_dns_query, &curpos, verbose); - } - } - if (h->anscount) - { - if (verbose > 1) - s = format (s, " Replies:\n"); - - for (i = 0; i < clib_net_to_host_u16 (h->anscount); i++) - { - /* curpos is a value-result parm */ - s = format (s, "%U", format_dns_reply_data, reply_as_u8, &curpos, - verbose, &print_ip4, &print_ip6); - } - } - return s; -} - -u8 * -format_dns_cache (u8 * s, va_list * args) -{ - dns_main_t *dm = va_arg (*args, dns_main_t *); - f64 now = va_arg (*args, f64); - int verbose = va_arg (*args, int); - u8 *name = va_arg (*args, u8 *); - dns_cache_entry_t *ep; - char *ss; - uword *p; - - if (dm->is_enabled == 0) - { - s = format (s, "The DNS cache is disabled..."); - return s; - } - - if (pool_elts (dm->entries) == 0) - { - s = format (s, "The DNS cache is empty..."); - return s; - } - - dns_cache_lock (dm); - - if (name) - { - p = hash_get_mem (dm->cache_entry_by_name, name); - if (!p) - { - s = format (s, "%s is not in the cache...", name); - dns_cache_unlock (dm); - return (s); - } - - ep = pool_elt_at_index (dm->entries, p[0]); - /* Magic to spit out a C-initializer to research hemorrhoids... */ - if (verbose == 3) - { - int i, j; - s = format (s, "static u8 dns_reply_data_initializer[] =\n"); - s = format (s, "{\n"); - j = 0; - for (i = 0; i < vec_len (ep->dns_response); i++) - { - if (j++ == 8) - { - j = 0; - vec_add1 (s, '\n'); - } - s = format (s, "0x%02x, ", ep->dns_response[i]); - } - s = format (s, "};\n"); - } - else - { - if (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) - { - ASSERT (ep->dns_response); - if (ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC) - ss = "[S] "; - else - ss = " "; - - if (verbose < 2 && ep->flags & DNS_CACHE_ENTRY_FLAG_CNAME) - s = format (s, "%s%s -> %s", ss, ep->name, ep->cname); - else - s = format (s, "%s%s -> %U", ss, ep->name, - format_dns_reply, ep->dns_response, verbose); - if (!(ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC)) - { - f64 time_left = ep->expiration_time - now; - if (time_left > 0.0) - s = format (s, " TTL left %.1f", time_left); - else - s = format (s, " EXPIRED"); - } - } - else - { - ASSERT (ep->dns_request); - s = format (s, "[P] %U", format_dns_reply, ep->dns_request, - verbose); - } - vec_add1 (s, '\n'); - } - return s; - } - - s = format (s, "DNS cache contains %d entries\n", pool_elts (dm->entries)); - - if (verbose > 0) - { - /* *INDENT-OFF* */ - pool_foreach (ep, dm->entries, - ({ - if (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) - { - ASSERT (ep->dns_response); - if (ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC) - ss = "[S] "; - else - ss = " "; - - if (verbose < 2 && ep->flags & DNS_CACHE_ENTRY_FLAG_CNAME) - s = format (s, "%s%s -> %s", ss, ep->name, ep->cname); - else - s = format (s, "%s%s -> %U", ss, ep->name, - format_dns_reply, - ep->dns_response, - verbose); - if (!(ep->flags & DNS_CACHE_ENTRY_FLAG_STATIC)) - { - f64 time_left = ep->expiration_time - now; - if (time_left > 0.0) - s = format (s, " TTL left %.1f", time_left); - else - s = format (s, " EXPIRED"); - - if (verbose > 2) - s = format (s, " %d client notifications pending\n", - vec_len(ep->pending_requests)); - } - } - else - { - ASSERT (ep->dns_request); - s = format (s, "[P] %U", format_dns_reply, ep->dns_request, - verbose); - } - vec_add1 (s, '\n'); - })); - /* *INDENT-ON* */ - } - - dns_cache_unlock (dm); - - return s; -} - -static clib_error_t * -show_dns_cache_command_fn (vlib_main_t * vm, - unformat_input_t * input, vlib_cli_command_t * cmd) -{ - dns_main_t *dm = &dns_main; - int verbose = 0; - u8 *name = 0; - f64 now = vlib_time_now (vm); - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "verbose %d", &verbose)) - ; - else if (unformat (input, "verbose")) - verbose = 1; - else if (unformat (input, "name %s", &name)) - ; - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - vlib_cli_output (vm, "%U", format_dns_cache, dm, now, verbose, name); - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (show_dns_cache_command) = -{ - .path = "show dns cache", - .short_help = "show dns cache [verbose [nn]]", - .function = show_dns_cache_command_fn, -}; -/* *INDENT-ON* */ - -static clib_error_t * -dns_cache_add_del_command_fn (vlib_main_t * vm, - unformat_input_t * input, - vlib_cli_command_t * cmd) -{ - dns_main_t *dm = &dns_main; - u8 *dns_reply_data; - u8 *name; - int is_add = -1; - int is_clear = -1; - int rv; - clib_error_t *error; - - if (unformat (input, "add")) - is_add = 1; - if (unformat (input, "del")) - is_add = 0; - if (unformat (input, "clear")) - is_clear = 1; - - if (is_add == -1 && is_clear == -1) - return clib_error_return (0, "add / del / clear required..."); - - if (is_clear == 1) - { - rv = dns_cache_clear (dm); - switch (rv) - { - case 0: - return 0; - - case VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED: - error = clib_error_return (0, "Name resolution not enabled"); - return error; - } - } - - /* Delete (by name)? */ - if (is_add == 0) - { - if (unformat (input, "%v", &name)) - { - rv = dns_delete_by_name (dm, name); - switch (rv) - { - case VNET_API_ERROR_NO_SUCH_ENTRY: - error = clib_error_return (0, "%v not in the cache...", name); - vec_free (name); - return error; - - case VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED: - error = clib_error_return (0, "Name resolution not enabled"); - vec_free (name); - return error; - - case 0: - vec_free (name); - return 0; - - default: - error = clib_error_return (0, "dns_delete_by_name returned %d", - rv); - vec_free (name); - return error; - } - } - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - /* Note: dns_add_static_entry consumes the name vector if OK... */ - if (unformat (input, "%U", unformat_dns_reply, &dns_reply_data, &name)) - { - rv = dns_add_static_entry (dm, name, dns_reply_data); - switch (rv) - { - case VNET_API_ERROR_ENTRY_ALREADY_EXISTS: - vec_free (name); - vec_free (dns_reply_data); - return clib_error_return (0, "%v already in the cache...", name); - case 0: - return 0; - - default: - return clib_error_return (0, "dns_add_static_entry returned %d", - rv); - } - } - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (dns_cache_add_del_command) = -{ - .path = "dns cache", - .short_help = "dns cache [add|del|clear] <name> [ip4][ip6]", - .function = dns_cache_add_del_command_fn, -}; -/* *INDENT-ON* */ - -#define DNS_FORMAT_TEST 1 - -#if DNS_FORMAT_TEST > 0 -#if 0 -/* yahoo.com */ -static u8 dns_reply_data_initializer[] = - { 0x0, 0x0, 0x81, 0x80, 0x0, 0x1, 0x0, 0x10, 0x0, 0x0, 0x0, 0x0, 0x5, - 0x79, 0x61, 0x68, 0x6f, 0x6f, 0x3, 0x63, 0x6f, 0x6d, - 0x0, /* null lbl */ - 0x0, 0xff, /* type ALL */ - 0x0, 0x1, /* class IN */ - 0xc0, 0xc, /* pointer to yahoo.com name */ - 0x0, 0x10, 0x0, 0x1, 0x0, 0x0, 0x6, 0x5c, 0x0, 0x24, 0x23, - 0x76, 0x3d, 0x73, 0x70, 0x66, 0x31, 0x20, 0x72, 0x65, 0x64, 0x69, 0x72, - 0x65, 0x63, 0x74, 0x3d, 0x5f, 0x73, 0x70, 0x66, 0x2e, 0x6d, 0x61, 0x69, - 0x6c, 0x2e, 0x79, 0x61, 0x68, 0x6f, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0xc0, - 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x50, 0xd4, 0x0, 0x6, 0x3, 0x6e, 0x73, - 0x35, 0xc0, 0xc, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x50, 0xd4, 0x0, - 0x6, 0x3, 0x6e, 0x73, 0x34, 0xc0, 0xc, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, - 0x1, 0x50, 0xd4, 0x0, 0x6, 0x3, 0x6e, 0x73, 0x31, 0xc0, 0xc, 0xc0, 0xc, - 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x50, 0xd4, 0x0, 0x6, 0x3, 0x6e, 0x73, 0x32, - 0xc0, 0xc, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x50, 0xd4, 0x0, 0x6, - 0x3, 0x6e, 0x73, 0x33, 0xc0, 0xc, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, - 0x6, 0x5c, 0x0, 0x19, 0x0, 0x1, 0x4, 0x6d, 0x74, 0x61, 0x36, 0x3, 0x61, - 0x6d, 0x30, 0x8, 0x79, 0x61, 0x68, 0x6f, 0x6f, 0x64, 0x6e, 0x73, 0x3, - 0x6e, - 0x65, 0x74, 0x0, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x6, 0x5c, 0x0, - 0x9, 0x0, 0x1, 0x4, 0x6d, 0x74, 0x61, 0x37, 0xc0, 0xb8, 0xc0, 0xc, 0x0, - 0xf, 0x0, 0x1, 0x0, 0x0, 0x6, 0x5c, 0x0, 0x9, 0x0, 0x1, 0x4, 0x6d, 0x74, - 0x61, 0x35, 0xc0, 0xb8, 0xc0, 0xc, 0x0, 0x1c, 0x0, 0x1, 0x0, 0x0, 0x6, - 0x5c, 0x0, 0x10, 0x20, 0x1, 0x49, 0x98, 0x0, 0x44, 0x2, 0x4, 0x0, 0x0, - 0x0, - 0x0, 0x0, 0x0, 0x0, 0xa7, 0xc0, 0xc, 0x0, 0x1c, 0x0, 0x1, 0x0, 0x0, 0x6, - 0x5c, 0x0, 0x10, 0x20, 0x1, 0x49, 0x98, 0x0, 0xc, 0xa, 0x6, 0x0, 0x0, 0x0, - 0x0, 0x0, 0x2, 0x40, 0x8, 0xc0, 0xc, 0x0, 0x1c, 0x0, 0x1, 0x0, 0x0, 0x6, - 0x5c, 0x0, 0x10, 0x20, 0x1, 0x49, 0x98, 0x0, 0x58, 0xc, 0x2, 0x0, 0x0, - 0x0, - 0x0, 0x0, 0x0, 0x0, 0xa9, 0xc0, 0xc, 0x0, 0x1, 0x0, 0x1, 0x0, 0x0, 0x6, - 0x5c, 0x0, 0x4, 0x62, 0x8a, 0xfd, 0x6d, 0xc0, 0xc, 0x0, 0x1, 0x0, 0x1, - 0x0, - 0x0, 0x6, 0x5c, 0x0, 0x4, 0xce, 0xbe, 0x24, 0x2d, 0xc0, 0xc, 0x0, 0x1, - 0x0, - 0x1, 0x0, 0x0, 0x6, 0x5c, 0x0, 0x4, 0x62, 0x8b, 0xb4, 0x95, 0xc0, 0xc, - 0x0, - 0x6, 0x0, 0x1, 0x0, 0x0, 0x6, 0x5c, 0x0, 0x2d, 0xc0, 0x7b, 0xa, 0x68, - 0x6f, - 0x73, 0x74, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x9, 0x79, 0x61, 0x68, - 0x6f, 0x6f, 0x2d, 0x69, 0x6e, 0x63, 0xc0, 0x12, 0x78, 0x3a, 0x85, 0x44, - 0x0, 0x0, 0xe, 0x10, 0x0, 0x0, 0x1, 0x2c, 0x0, 0x1b, 0xaf, 0x80, 0x0, 0x0, - 0x2, 0x58 -}; - -/* www.cisco.com, has no addresses in reply */ -static u8 dns_reply_data_initializer[] = { - 0x00, 0x01, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, - 0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77, 0x05, - 0x63, 0x69, 0x73, 0x63, 0x6f, 0x03, 0x63, 0x6f, 0x6d, - - 0x00, 0x00, 0xff, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x05, - 0x00, 0x01, 0x00, 0x00, 0x0b, 0xd3, 0x00, 0x1a, 0x03, - 0x77, 0x77, 0x77, 0x05, 0x63, 0x69, 0x73, 0x63, 0x6f, - 0x03, 0x63, 0x6f, 0x6d, 0x06, 0x61, 0x6b, 0x61, 0x64, - 0x6e, 0x73, 0x03, 0x6e, 0x65, 0x74, 0x00, -}; - -/* bind8 (linux widget, w/ nasty double pointer chasees */ -static u8 dns_reply_data_initializer[] = { - /* 0 */ - 0x00, 0x01, 0x81, 0x80, 0x00, 0x01, 0x00, 0x08, - /* 8 */ - 0x00, 0x06, 0x00, 0x06, 0x0a, 0x6f, 0x72, 0x69, - /* 16 */ - 0x67, 0x69, 0x6e, 0x2d, 0x77, 0x77, 0x77, 0x05, - /* 24 */ - 0x63, 0x69, 0x73, 0x63, 0x6f, 0x03, 0x63, 0x6f, - /* 32 */ - 0x6d, 0x00, 0x00, 0xff, 0x00, 0x01, 0x0a, 0x6f, - /* 40 */ - 0x72, 0x69, 0x67, 0x69, 0x6e, 0x2d, 0x77, 0x77, - /* 48 */ - 0x77, 0x05, 0x43, 0x49, 0x53, 0x43, 0x4f, 0xc0, - - /* 56 */ - 0x1d, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x05, - - /* 64 */ - 0x9a, 0x00, 0x18, 0x15, 0x72, 0x63, 0x64, - 0x6e, 0x39, 0x2d, 0x31, 0x34, 0x70, 0x2d, 0x64, 0x63, - 0x7a, 0x30, 0x35, 0x6e, 0x2d, 0x67, 0x73, 0x73, 0x31, - 0xc0, 0x17, 0xc0, 0x26, 0x00, 0x02, 0x00, 0x01, 0x00, - 0x00, 0x05, 0x9a, 0x00, 0x1a, 0x17, 0x61, 0x6c, 0x6c, - 0x6e, 0x30, 0x31, 0x2d, 0x61, 0x67, 0x30, 0x39, 0x2d, - 0x64, 0x63, 0x7a, 0x30, 0x33, 0x6e, 0x2d, 0x67, 0x73, - 0x73, 0x31, 0xc0, 0x17, 0xc0, 0x26, 0x00, 0x02, 0x00, - 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, 0x10, 0x0d, 0x72, - 0x74, 0x70, 0x35, 0x2d, 0x64, 0x6d, 0x7a, 0x2d, 0x67, - 0x73, 0x73, 0x31, 0xc0, 0x17, 0xc0, 0x26, 0x00, 0x02, - 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, 0x18, 0x15, - 0x6d, 0x74, 0x76, 0x35, 0x2d, 0x61, 0x70, 0x31, 0x30, - 0x2d, 0x64, 0x63, 0x7a, 0x30, 0x36, 0x6e, 0x2d, 0x67, - 0x73, 0x73, 0x31, 0xc0, 0x17, 0xc0, 0x26, 0x00, 0x02, - 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, 0x1b, 0x18, - 0x73, 0x6e, 0x67, 0x64, 0x63, 0x30, 0x31, 0x2d, 0x61, - 0x62, 0x30, 0x37, 0x2d, 0x64, 0x63, 0x7a, 0x30, 0x31, - 0x6e, 0x2d, 0x67, 0x73, 0x73, 0x31, 0xc0, 0x17, 0xc0, - 0x26, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, - 0x00, 0x1a, 0x17, 0x61, 0x65, 0x72, 0x30, 0x31, 0x2d, - 0x72, 0x34, 0x63, 0x32, 0x35, 0x2d, 0x64, 0x63, 0x7a, - 0x30, 0x31, 0x6e, 0x2d, 0x67, 0x73, 0x73, 0x31, 0xc0, - 0x17, 0xc0, 0x26, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, - 0x00, 0x81, 0x00, 0x04, 0x48, 0xa3, 0x04, 0xa1, 0xc0, - 0x26, 0x00, 0x1c, 0x00, 0x01, 0x00, 0x00, 0x00, 0x82, - 0x00, 0x10, 0x20, 0x01, 0x04, 0x20, 0x12, 0x01, 0x00, - 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, - 0xc0, 0x0c, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x05, - 0x9a, 0x00, 0x02, 0xc0, 0xf4, 0xc0, 0x0c, 0x00, 0x02, - 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, 0x02, 0xc0, - 0xcd, 0xc0, 0x0c, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, - 0x05, 0x9a, 0x00, 0x02, 0xc0, 0x8d, 0xc0, 0x0c, 0x00, - 0x02, 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, 0x02, - 0xc0, 0x43, 0xc0, 0x0c, 0x00, 0x02, 0x00, 0x01, 0x00, - 0x00, 0x05, 0x9a, 0x00, 0x02, 0xc0, 0xa9, 0xc0, 0x0c, - 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x05, 0x9a, 0x00, - 0x02, 0xc0, 0x67, 0xc0, 0x8d, 0x00, 0x01, 0x00, 0x01, - 0x00, 0x00, 0x07, 0x08, 0x00, 0x04, 0x40, 0x66, 0xf6, - 0x05, 0xc0, 0xa9, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, - 0x07, 0x08, 0x00, 0x04, 0xad, 0x24, 0xe0, 0x64, 0xc0, - 0x43, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x07, 0x08, - 0x00, 0x04, 0x48, 0xa3, 0x04, 0x1c, 0xc0, 0xf4, 0x00, - 0x01, 0x00, 0x01, 0x00, 0x00, 0x07, 0x08, 0x00, 0x04, - 0xad, 0x26, 0xd4, 0x6c, 0xc0, 0x67, 0x00, 0x01, 0x00, - 0x01, 0x00, 0x00, 0x07, 0x08, 0x00, 0x04, 0xad, 0x25, - 0x90, 0x64, 0xc0, 0xcd, 0x00, 0x01, 0x00, 0x01, 0x00, - 0x00, 0x07, 0x08, 0x00, 0x04, 0xad, 0x27, 0x70, 0x44, -}; - -/* google.com */ -static u8 dns_reply_data_initializer[] = - { 0x0, 0x0, 0x81, 0x80, 0x0, 0x1, 0x0, 0xe, 0x0, 0x0, 0x0, 0x0, 0x6, - 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x3, 0x63, 0x6f, 0x6d, 0x0, 0x0, 0xff, - 0x0, 0x1, 0xc0, 0xc, 0x0, 0x1, 0x0, 0x1, 0x0, 0x0, 0x1, 0x2b, 0x0, 0x4, - 0xac, 0xd9, 0x3, 0x2e, 0xc0, 0xc, 0x0, 0x1c, 0x0, 0x1, 0x0, 0x0, 0x1, - 0x2b, - 0x0, 0x10, 0x26, 0x7, 0xf8, 0xb0, 0x40, 0x4, 0x8, 0xf, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x0, 0x20, 0xe, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x51, 0x7f, - 0x0, 0x6, 0x3, 0x6e, 0x73, 0x31, 0xc0, 0xc, 0xc0, 0xc, 0x0, 0x6, 0x0, 0x1, - 0x0, 0x0, 0x0, 0x3b, 0x0, 0x22, 0xc0, 0x54, 0x9, 0x64, 0x6e, 0x73, 0x2d, - 0x61, 0x64, 0x6d, 0x69, 0x6e, 0xc0, 0xc, 0xa, 0x3d, 0xc7, 0x30, 0x0, 0x0, - 0x3, 0x84, 0x0, 0x0, 0x3, 0x84, 0x0, 0x0, 0x7, 0x8, 0x0, 0x0, 0x0, 0x3c, - 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x57, 0x0, 0x11, 0x0, 0x1e, - 0x4, 0x61, 0x6c, 0x74, 0x32, 0x5, 0x61, 0x73, 0x70, 0x6d, 0x78, 0x1, 0x6c, - 0xc0, 0xc, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x57, 0x0, 0x4, - 0x0, 0xa, 0xc0, 0x9b, 0xc0, 0xc, 0x0, 0x10, 0x0, 0x1, 0x0, 0x0, 0xe, 0xf, - 0x0, 0x24, 0x23, 0x76, 0x3d, 0x73, 0x70, 0x66, 0x31, 0x20, 0x69, 0x6e, - 0x63, 0x6c, 0x75, 0x64, 0x65, 0x3a, 0x5f, 0x73, 0x70, 0x66, 0x2e, 0x67, - 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x20, 0x7e, 0x61, - 0x6c, 0x6c, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, 0x51, 0x7f, 0x0, 0x6, - 0x3, 0x6e, 0x73, 0x32, 0xc0, 0xc, 0xc0, 0xc, 0x1, 0x1, 0x0, 0x1, 0x0, 0x1, - 0x51, 0x7f, 0x0, 0xf, 0x0, 0x5, 0x69, 0x73, 0x73, 0x75, 0x65, 0x70, 0x6b, - 0x69, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, - 0x1, 0x51, 0x7f, 0x0, 0x6, 0x3, 0x6e, 0x73, 0x34, 0xc0, 0xc, 0xc0, 0xc, - 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x57, 0x0, 0x9, 0x0, 0x28, 0x4, 0x61, - 0x6c, 0x74, 0x33, 0xc0, 0x9b, 0xc0, 0xc, 0x0, 0x2, 0x0, 0x1, 0x0, 0x1, - 0x51, 0x7f, 0x0, 0x6, 0x3, 0x6e, 0x73, 0x33, 0xc0, 0xc, 0xc0, 0xc, 0x0, - 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x57, 0x0, 0x9, 0x0, 0x32, 0x4, 0x61, 0x6c, - 0x74, 0x34, 0xc0, 0x9b, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, - 0x57, - 0x0, 0x9, 0x0, 0x14, 0x4, 0x61, 0x6c, 0x74, 0x31, 0xc0, 0x9b -}; - -#else -/* www.weatherlink.com */ -static u8 dns_reply_data_initializer[] = { - 0x00, 0x00, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, - 0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77, 0x0b, - 0x77, 0x65, 0x61, 0x74, 0x68, 0x65, 0x72, 0x6c, 0x69, - 0x6e, 0x6b, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0xff, - 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, - 0x00, 0x0c, 0x9e, 0x00, 0x1f, 0x0e, 0x64, 0x33, 0x6b, - 0x72, 0x30, 0x67, 0x75, 0x62, 0x61, 0x31, 0x64, 0x76, - 0x77, 0x66, 0x0a, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x66, - 0x72, 0x6f, 0x6e, 0x74, 0x03, 0x6e, 0x65, 0x74, 0x00, -}; - -#endif - -static clib_error_t * -test_dns_fmt_command_fn (vlib_main_t * vm, - unformat_input_t * input, vlib_cli_command_t * cmd) -{ - u8 *dns_reply_data = 0; - int verbose = 0; - int rv; - vl_api_dns_resolve_name_reply_t _rm, *rmp = &_rm; - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "verbose %d", &verbose)) - ; - else if (unformat (input, "verbose")) - verbose = 1; - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - vec_validate (dns_reply_data, ARRAY_LEN (dns_reply_data_initializer) - 1); - - memcpy (dns_reply_data, dns_reply_data_initializer, - ARRAY_LEN (dns_reply_data_initializer)); - - vlib_cli_output (vm, "%U", format_dns_reply, dns_reply_data, verbose); - - clib_memset (rmp, 0, sizeof (*rmp)); - - rv = vnet_dns_response_to_reply (dns_reply_data, rmp, 0 /* ttl-ptr */ ); - - switch (rv) - { - case VNET_API_ERROR_NAME_SERVER_NO_ADDRESSES: - vlib_cli_output (vm, "no addresses found..."); - break; - - default: - vlib_cli_output (vm, "response to reply returned %d", rv); - break; - - case 0: - if (rmp->ip4_set) - vlib_cli_output (vm, "ip4 address: %U", format_ip4_address, - (ip4_address_t *) rmp->ip4_address); - if (rmp->ip6_set) - vlib_cli_output (vm, "ip6 address: %U", format_ip6_address, - (ip6_address_t *) rmp->ip6_address); - break; - } - - vec_free (dns_reply_data); - - return 0; -} - - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (test_dns_fmt_command) = -{ - .path = "test dns format", - .short_help = "test dns format", - .function = test_dns_fmt_command_fn, -}; -/* *INDENT-ON* */ - -static clib_error_t * -test_dns_unfmt_command_fn (vlib_main_t * vm, - unformat_input_t * input, vlib_cli_command_t * cmd) -{ - u8 *dns_reply_data = 0; - int verbose = 0; - int reply_set = 0; - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "verbose %d", &verbose)) - ; - else if (unformat (input, "verbose")) - verbose = 1; - else if (unformat (input, "%U", unformat_dns_reply, &dns_reply_data)) - reply_set = 1; - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - if (reply_set == 0) - return clib_error_return (0, "dns data not set..."); - - vlib_cli_output (vm, "%U", format_dns_reply, dns_reply_data, verbose); - - vec_free (dns_reply_data); - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (test_dns_unfmt_command) = -{ - .path = "test dns unformat", - .short_help = "test dns unformat <name> [ip4][ip6]", - .function = test_dns_unfmt_command_fn, -}; -/* *INDENT-ON* */ - -static clib_error_t * -test_dns_expire_command_fn (vlib_main_t * vm, - unformat_input_t * input, - vlib_cli_command_t * cmd) -{ - dns_main_t *dm = &dns_main; - u8 *name = 0; - uword *p; - clib_error_t *e; - dns_cache_entry_t *ep; - - if (unformat (input, "%v", &name)) - { - vec_add1 (name, 0); - _vec_len (name) -= 1; - } - else - return clib_error_return (0, "no name provided"); - - dns_cache_lock (dm); - - p = hash_get_mem (dm->cache_entry_by_name, name); - if (!p) - { - dns_cache_unlock (dm); - e = clib_error_return (0, "%s is not in the cache...", name); - vec_free (name); - return e; - } - - ep = pool_elt_at_index (dm->entries, p[0]); - - ep->expiration_time = 0; - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (test_dns_expire_command) = -{ - .path = "test dns expire", - .short_help = "test dns expire <name>", - .function = test_dns_expire_command_fn, -}; -/* *INDENT-ON* */ -#endif - -void -vnet_send_dns6_reply (dns_main_t * dm, dns_pending_request_t * pr, - dns_cache_entry_t * ep, vlib_buffer_t * b0) -{ - clib_warning ("Unimplemented..."); -} - - -void -vnet_send_dns4_reply (dns_main_t * dm, dns_pending_request_t * pr, - dns_cache_entry_t * ep, vlib_buffer_t * b0) -{ - vlib_main_t *vm = dm->vlib_main; - u32 bi = 0; - fib_prefix_t prefix; - fib_node_index_t fei; - u32 sw_if_index, fib_index; - ip4_main_t *im4 = &ip4_main; - ip_lookup_main_t *lm4 = &im4->lookup_main; - ip_interface_address_t *ia = 0; - ip4_address_t *src_address; - ip4_header_t *ip; - udp_header_t *udp; - dns_header_t *dh; - vlib_frame_t *f; - u32 *to_next; - u8 *dns_response; - u8 *reply; - vl_api_dns_resolve_name_reply_t _rnr, *rnr = &_rnr; - vl_api_dns_resolve_ip_reply_t _rir, *rir = &_rir; - u32 ttl, tmp; - u32 qp_offset; - dns_query_t *qp; - dns_rr_t *rr; - u8 *rrptr; - int is_fail = 0; - int is_recycle = (b0 != 0); - - ASSERT (ep && ep->dns_response); - - if (pr->request_type == DNS_PEER_PENDING_NAME_TO_IP) - { - /* Quick and dirty way to dig up the A-record address. $$ FIXME */ - clib_memset (rnr, 0, sizeof (*rnr)); - if (vnet_dns_response_to_reply (ep->dns_response, rnr, &ttl)) - { - /* clib_warning ("response_to_reply failed..."); */ - is_fail = 1; - } - if (rnr->ip4_set == 0) - { - /* clib_warning ("No A-record..."); */ - is_fail = 1; - } - } - else if (pr->request_type == DNS_PEER_PENDING_IP_TO_NAME) - { - clib_memset (rir, 0, sizeof (*rir)); - if (vnet_dns_response_to_name (ep->dns_response, rir, &ttl)) - { - /* clib_warning ("response_to_name failed..."); */ - is_fail = 1; - } - } - else - { - clib_warning ("Unknown request type %d", pr->request_type); - return; - } - - /* Initialize a buffer */ - if (b0 == 0) - { - if (vlib_buffer_alloc (vm, &bi, 1) != 1) - return; - b0 = vlib_get_buffer (vm, bi); - } - else - { - /* Use the buffer we were handed. Reinitialize it... */ - vlib_buffer_t bt = { }; - /* push/pop the reference count */ - u8 save_ref_count = b0->ref_count; - vlib_buffer_copy_template (b0, &bt); - b0->ref_count = save_ref_count; - bi = vlib_get_buffer_index (vm, b0); - } - - if (b0->flags & VLIB_BUFFER_NEXT_PRESENT) - vlib_buffer_free_one (vm, b0->next_buffer); - - /* - * Reset the buffer. We recycle the DNS request packet in the cache - * hit case, and reply immediately from the request node. - * - * In the resolution-required / deferred case, resetting a freshly-allocated - * buffer won't hurt. We hope. - */ - b0->flags |= (VNET_BUFFER_F_LOCALLY_ORIGINATED - | VLIB_BUFFER_TOTAL_LENGTH_VALID); - vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; /* "local0" */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0; /* default VRF for now */ - - /* Find a FIB path to the peer we're trying to answer */ - clib_memcpy (&prefix.fp_addr.ip4, pr->dst_address, sizeof (ip4_address_t)); - prefix.fp_proto = FIB_PROTOCOL_IP4; - prefix.fp_len = 32; - - fib_index = fib_table_find (prefix.fp_proto, 0 /* default VRF for now */ ); - if (fib_index == (u32) ~ 0) - { - clib_warning ("no fib table"); - return; - } - - fei = fib_table_lookup (fib_index, &prefix); - - /* Couldn't find route to destination. Bail out. */ - if (fei == FIB_NODE_INDEX_INVALID) - { - clib_warning ("no route to DNS server"); - return; - } - - sw_if_index = fib_entry_get_resolving_interface (fei); - - if (sw_if_index == ~0) - { - clib_warning - ("route to %U exists, fei %d, get_resolving_interface returned" - " ~0", fei, format_ip4_address, &prefix.fp_addr); - return; - } - - /* *INDENT-OFF* */ - foreach_ip_interface_address(lm4, ia, sw_if_index, 1 /* honor unnumbered */, - ({ - src_address = ip_interface_address_get_address (lm4, ia); - goto found_src_address; - })); - /* *INDENT-ON* */ - - clib_warning ("FIB BUG"); - return; - -found_src_address: - - ip = vlib_buffer_get_current (b0); - udp = (udp_header_t *) (ip + 1); - dns_response = (u8 *) (udp + 1); - clib_memset (ip, 0, sizeof (*ip) + sizeof (*udp)); - - /* - * Start with the variadic portion of the exercise. - * Turn the name into a set of DNS "labels". Max length - * per label is 63, enforce that. - */ - reply = name_to_labels (pr->name); - vec_free (pr->name); - - qp_offset = vec_len (reply); - - /* Add space for the query header */ - vec_validate (reply, qp_offset + sizeof (dns_query_t) - 1); - - qp = (dns_query_t *) (reply + qp_offset); - - if (pr->request_type == DNS_PEER_PENDING_NAME_TO_IP) - qp->type = clib_host_to_net_u16 (DNS_TYPE_A); - else - qp->type = clib_host_to_net_u16 (DNS_TYPE_PTR); - - qp->class = clib_host_to_net_u16 (DNS_CLASS_IN); - - /* Punch in space for the dns_header_t */ - vec_insert (reply, sizeof (dns_header_t), 0); - - dh = (dns_header_t *) reply; - - /* Transaction ID = pool index */ - dh->id = pr->id; - - /* Announce that we did a recursive lookup */ - tmp = DNS_AA | DNS_RA | DNS_RD | DNS_OPCODE_QUERY | DNS_QR; - if (is_fail) - tmp |= DNS_RCODE_NAME_ERROR; - dh->flags = clib_host_to_net_u16 (tmp); - dh->qdcount = clib_host_to_net_u16 (1); - dh->anscount = (is_fail == 0) ? clib_host_to_net_u16 (1) : 0; - dh->nscount = 0; - dh->arcount = 0; - - /* If the name resolution worked, cough up an appropriate RR */ - if (is_fail == 0) - { - /* Add the answer. First, a name pointer (0xC00C) */ - vec_add1 (reply, 0xC0); - vec_add1 (reply, 0x0C); - - /* Now, add single A-rec RR */ - if (pr->request_type == DNS_PEER_PENDING_NAME_TO_IP) - { - vec_add2 (reply, rrptr, sizeof (dns_rr_t) + sizeof (ip4_address_t)); - rr = (dns_rr_t *) rrptr; - - rr->type = clib_host_to_net_u16 (DNS_TYPE_A); - rr->class = clib_host_to_net_u16 (1 /* internet */ ); - rr->ttl = clib_host_to_net_u32 (ttl); - rr->rdlength = clib_host_to_net_u16 (sizeof (ip4_address_t)); - clib_memcpy (rr->rdata, rnr->ip4_address, sizeof (ip4_address_t)); - } - else - { - /* Or a single PTR RR */ - u8 *vecname = format (0, "%s", rir->name); - u8 *label_vec = name_to_labels (vecname); - vec_free (vecname); - - vec_add2 (reply, rrptr, sizeof (dns_rr_t) + vec_len (label_vec)); - rr = (dns_rr_t *) rrptr; - rr->type = clib_host_to_net_u16 (DNS_TYPE_PTR); - rr->class = clib_host_to_net_u16 (1 /* internet */ ); - rr->ttl = clib_host_to_net_u32 (ttl); - rr->rdlength = clib_host_to_net_u16 (vec_len (label_vec)); - clib_memcpy (rr->rdata, label_vec, vec_len (label_vec)); - vec_free (label_vec); - } - } - clib_memcpy (dns_response, reply, vec_len (reply)); - - /* Set the packet length */ - b0->current_length = sizeof (*ip) + sizeof (*udp) + vec_len (reply); - - /* IP header */ - ip->ip_version_and_header_length = 0x45; - ip->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); - ip->ttl = 255; - ip->protocol = IP_PROTOCOL_UDP; - ip->src_address.as_u32 = src_address->as_u32; - clib_memcpy (ip->dst_address.as_u8, pr->dst_address, - sizeof (ip4_address_t)); - ip->checksum = ip4_header_checksum (ip); - - /* UDP header */ - udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dns); - udp->dst_port = pr->dst_port; - udp->length = clib_host_to_net_u16 (sizeof (udp_header_t) + - vec_len (reply)); - udp->checksum = 0; - vec_free (reply); - - /* - * Ship pkts made out of whole cloth to ip4_lookup - * Caller will ship recycled dns reply packets to ip4_lookup - */ - if (is_recycle == 0) - { - f = vlib_get_frame_to_node (vm, ip4_lookup_node.index); - to_next = vlib_frame_vector_args (f); - to_next[0] = bi; - f->n_vectors = 1; - vlib_put_frame_to_node (vm, ip4_lookup_node.index, f); - } -} - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/dns/dns.h b/src/vnet/dns/dns.h deleted file mode 100644 index 6d0901020f9..00000000000 --- a/src/vnet/dns/dns.h +++ /dev/null @@ -1,221 +0,0 @@ -/* - * Copyright (c) 2017 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. - */ - -#ifndef included_dns_h -#define included_dns_h - -#include <vppinfra/time.h> -#include <vppinfra/cache.h> -#include <vppinfra/error.h> - -#include <vppinfra/hash.h> -#include <vnet/dns/dns_packet.h> -#include <vnet/ip/ip.h> -#include <vppinfra/lock.h> - -typedef struct -{ - u32 request_type; - u32 client_index; - u32 client_context; - u8 is_ip6; - u16 dst_port; - u16 id; - u16 pad; - u8 dst_address[16]; - u8 *name; -} dns_pending_request_t; - -typedef enum -{ - DNS_API_PENDING_NAME_TO_IP = 1, - DNS_API_PENDING_IP_TO_NAME, - DNS_PEER_PENDING_NAME_TO_IP, - DNS_PEER_PENDING_IP_TO_NAME, -} dns_pending_request_type_t; - -typedef struct -{ - /** flags */ - volatile u8 flags; - - /** The name in "normal human being" notation, e.g. www.foobar.com */ - u8 *name; - - /** For CNAME records, the "next name" to resolve */ - u8 *cname; - - /** Expiration time */ - f64 expiration_time; - - /** Cached dns request, for sending retries */ - u8 *dns_request; - - /** Retry parameters */ - int retry_count; - int server_rotor; - int server_af; - int server_fails; - f64 retry_timer; - - /** Cached dns response */ - u8 *dns_response; - - /** Clients / peers awaiting responses */ - dns_pending_request_t *pending_requests; -} dns_cache_entry_t; - -#define DNS_CACHE_ENTRY_FLAG_VALID (1<<0) /**< we have Actual Data */ -#define DNS_CACHE_ENTRY_FLAG_STATIC (1<<1) /**< static entry */ -#define DNS_CACHE_ENTRY_FLAG_CNAME (1<<2) /**< CNAME (indirect) entry */ - -#define DNS_RETRIES_PER_SERVER 3 - -#define DNS_RESOLVER_EVENT_RESOLVED 1 -#define DNS_RESOLVER_EVENT_PENDING 2 - - -typedef struct -{ - /** Pool of cache entries */ - dns_cache_entry_t *entries; - - /** Pool indices of unresolved entries */ - u32 *unresolved_entries; - - /** Find cached record by name */ - uword *cache_entry_by_name; - clib_spinlock_t cache_lock; - - /** enable / disable flag */ - int is_enabled; - - /** udp port registration complete */ - int udp_ports_registered; - - /** upstream name servers, e.g. 8.8.8.8 */ - ip4_address_t *ip4_name_servers; - ip6_address_t *ip6_name_servers; - - /** resolver process node index */ - u32 resolver_process_node_index; - - /** config parameters */ - u32 name_cache_size; - u32 max_ttl_in_seconds; - u32 random_seed; - - /* convenience */ - vlib_main_t *vlib_main; - vnet_main_t *vnet_main; -} dns_main_t; - -extern dns_main_t dns_main; - -extern vlib_node_registration_t dns46_reply_node; -extern vlib_node_registration_t dns4_request_node; -extern vlib_node_registration_t dns6_request_node; - -#define foreach_dns46_request_error \ -_(NONE, "No error") \ -_(UNIMPLEMENTED, "Unimplemented") \ -_(PROCESSED, "DNS request pkts processed") \ -_(IP_OPTIONS, "DNS pkts with ip options (dropped)") \ -_(BAD_REQUEST, "DNS pkts with serious discrepanices (dropped)") \ -_(TOO_MANY_REQUESTS, "DNS pkts asking too many questions") \ -_(RESOLUTION_REQUIRED, "DNS pkts pending upstream name resolution") - -typedef enum -{ -#define _(sym,str) DNS46_REQUEST_ERROR_##sym, - foreach_dns46_request_error -#undef _ - DNS46_REQUEST_N_ERROR, -} dns46_request_error_t; - -#define foreach_dns46_reply_error \ -_(DISABLED, "DNS pkts punted (feature disabled)") \ -_(PROCESSED, "DNS reply pkts processed") \ -_(NO_ELT, "No DNS pool element") \ -_(FORMAT_ERROR, "DNS format errors") \ -_(TEST_DROP, "DNS reply pkt dropped for test purposes") \ -_(MULTIPLE_REPLY, "DNS multiple reply packets") \ -_(NO_UNRESOLVED_ENTRY, "No unresolved entry for pkt") - -typedef enum -{ -#define _(sym,str) DNS46_REPLY_ERROR_##sym, - foreach_dns46_reply_error -#undef _ - DNS46_REPLY_N_ERROR, -} dns46_reply_error_t; - -void vnet_send_dns_request (dns_main_t * dm, dns_cache_entry_t * ep); -int -vnet_dns_cname_indirection_nolock (dns_main_t * dm, u32 ep_index, u8 * reply); - -int vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index); - -int -vnet_dns_resolve_name (dns_main_t * dm, u8 * name, dns_pending_request_t * t, - dns_cache_entry_t ** retp); - -void -vnet_dns_send_dns6_request (dns_main_t * dm, - dns_cache_entry_t * ep, ip6_address_t * server); -void -vnet_dns_send_dns4_request (dns_main_t * dm, - dns_cache_entry_t * ep, ip4_address_t * server); - -void vnet_send_dns4_reply (dns_main_t * dm, dns_pending_request_t * t, - dns_cache_entry_t * ep, vlib_buffer_t * b0); - -void vnet_send_dns6_reply (dns_main_t * dm, dns_pending_request_t * t, - dns_cache_entry_t * ep, vlib_buffer_t * b0); - -u8 *vnet_dns_labels_to_name (u8 * label, u8 * full_text, - u8 ** parse_from_here); - -void vnet_dns_create_resolver_process (dns_main_t * dm); - -format_function_t format_dns_reply; - -static inline void -dns_cache_lock (dns_main_t * dm) -{ - if (dm->cache_lock) - { - clib_spinlock_lock (&dm->cache_lock); - } -} - -static inline void -dns_cache_unlock (dns_main_t * dm) -{ - if (dm->cache_lock) - { - clib_spinlock_unlock (&dm->cache_lock); - } -} - -#endif /* included_dns_h */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/dns/dns_packet.h b/src/vnet/dns/dns_packet.h deleted file mode 100644 index da5ddfa64fe..00000000000 --- a/src/vnet/dns/dns_packet.h +++ /dev/null @@ -1,156 +0,0 @@ -/* - * 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. - */ - -#ifndef included_dns_packet_h -#define included_dns_packet_h - -/** - * DNS packet header format - */ - -/* *INDENT-OFF* */ -typedef CLIB_PACKED (struct { - u16 id; /**< transaction ID */ - u16 flags; /**< flags */ - u16 qdcount; /**< number of questions */ - u16 anscount; /**< number of answers */ - u16 nscount; /**< number of name servers */ - u16 arcount; /**< number of additional records */ -}) dns_header_t; -/* *INDENT-ON* */ - -#define DNS_RCODE_MASK (0xf) -#define DNS_RCODE_NO_ERROR 0 -#define DNS_RCODE_FORMAT_ERROR 1 -#define DNS_RCODE_SERVER_FAILURE 2 -#define DNS_RCODE_NAME_ERROR 3 -#define DNS_RCODE_NOT_IMPLEMENTED 4 -#define DNS_RCODE_REFUSED 5 - -#define DNS_RA (1<<7) /**< recursion available */ -#define DNS_RD (1<<8) /**< recursion desired */ -#define DNS_TC (1<<9) /**< truncation */ -#define DNS_AA (1<<10) /**< authoritative answer */ -#define DNS_OPCODE_MASK (0xf<<11) /**< opcode mask */ -#define DNS_OPCODE_QUERY (0<<11) /**< standard query */ -#define DNS_OPCODE_IQUERY (1<<11) /**< inverse query (deprecated) */ -#define DNS_OPCODE_STATUS (2<<11) /**< server status */ -#define DNS_QR (1<<15) /**< query=0, response=1 */ - - -/* - * Note: in DNS-land, www.foobar.com is encoded as three "labels," - * each of which amount to a 1 octet length followed by up to 63 - * octets of name. Don't forget to add a "null root label" after the last - * real one, or the poor slob trying to parse the name will have - * no chance whatsoever. - * - * All RRs have the same top level format shown below: - * - * 1 1 1 1 1 1 - * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | | - * / / - * / NAME / - * | | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | TYPE | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | CLASS | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | TTL | - * | | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | RDLENGTH | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--| - * / RDATA / - * / / - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * - * - * DNS "questions" have the following format: - * - * 1 1 1 1 1 1 - * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | | - * / QNAME / - * / / - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | QTYPE | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | QCLASS | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - */ - -/** - * DNS "question" fixed header. - */ -/* *INDENT-OFF* */ -typedef CLIB_PACKED (struct { - u16 type; /**< record type requested */ - u16 class; /**< class, 1 = internet */ -}) dns_query_t; -/* *INDENT-ON* */ - -/** - * DNS RR fixed header. - */ -/* *INDENT-OFF* */ -typedef CLIB_PACKED (struct { - u16 type; /**< record type */ - u16 class; /**< class, 1 = internet */ - u32 ttl; /**< time to live, in seconds */ - u16 rdlength; - /**< length of r */ - u8 rdata[0]; -}) dns_rr_t; -/* *INDENT-ON* */ - -/* - * There are quite a number of DNS record types - * Feel free to add as needed - */ -#define foreach_dns_type \ -_(A, 1) /**< ip4 host address */ \ -_(AAAA, 28) /**< ip6 host address */ \ -_(ALL, 255) /**< all available data */ \ -_(TEXT, 16) /**< a text string */ \ -_(NAMESERVER, 2) /**< a nameserver */ \ -_(CNAME, 5) /**< a CNAME (alias) */ \ -_(MAIL_EXCHANGE, 15) /**< a mail exchange */ \ -_(PTR, 12) /**< a PTR (pointer) record */ \ -_(HINFO, 13) /**< Host info */ - -typedef enum -{ -#define _(name,value) DNS_TYPE_##name = value, - foreach_dns_type -#undef _ -} dns_type_t; - -#define DNS_CLASS_IN 1 /**< The Internet */ - - -#endif /* included_dns_packet_h */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/dns/reply_node.c b/src/vnet/dns/reply_node.c deleted file mode 100644 index 77d54c84019..00000000000 --- a/src/vnet/dns/reply_node.c +++ /dev/null @@ -1,227 +0,0 @@ -/* - * Copyright (c) 2017 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 <vnet/dns/dns.h> - -#include <vlib/vlib.h> -#include <vnet/vnet.h> - -vlib_node_registration_t dns46_reply_node; - -typedef struct -{ - u32 pool_index; - u32 disposition; -} dns46_reply_trace_t; - -/* packet trace format function */ -static u8 * -format_dns46_reply_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 *); - dns46_reply_trace_t *t = va_arg (*args, dns46_reply_trace_t *); - - s = format (s, "DNS46_REPLY: pool index %d, disposition %d", - t->pool_index, t->disposition); - return s; -} - -vlib_node_registration_t dns46_reply_node; - -static char *dns46_reply_error_strings[] = { -#define _(sym,string) string, - foreach_dns46_reply_error -#undef _ -}; - -typedef enum -{ - DNS46_REPLY_NEXT_DROP, - DNS46_REPLY_NEXT_PUNT, - DNS46_REPLY_N_NEXT, -} dns46_reply_next_t; - -static uword -dns46_reply_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - u32 n_left_from, *from, *to_next; - dns46_reply_next_t next_index; - dns_main_t *dm = &dns_main; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - 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); - -#if 0 - while (n_left_from >= 4 && n_left_to_next >= 2) - { - u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT; - u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT; - u32 sw_if_index0, sw_if_index1; - u8 tmp0[6], tmp1[6]; - ethernet_header_t *en0, *en1; - u32 bi0, bi1; - vlib_buffer_t *b0, *b1; - - /* Prefetch next iteration. */ - { - vlib_buffer_t *p2, *p3; - - p2 = vlib_get_buffer (vm, from[2]); - p3 = vlib_get_buffer (vm, from[3]); - - vlib_prefetch_buffer_header (p2, LOAD); - vlib_prefetch_buffer_header (p3, LOAD); - - CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); - } - - /* speculatively enqueue b0 and b1 to the current next frame */ - to_next[0] = bi0 = from[0]; - to_next[1] = bi1 = from[1]; - from += 2; - to_next += 2; - n_left_from -= 2; - n_left_to_next -= 2; - - b0 = vlib_get_buffer (vm, bi0); - b1 = vlib_get_buffer (vm, bi1); - - /* $$$$$ End of processing 2 x packets $$$$$ */ - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) - { - if (b0->flags & VLIB_BUFFER_IS_TRACED) - { - dns46_reply_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->sw_if_index = sw_if_index0; - t->next_index = next0; - } - if (b1->flags & VLIB_BUFFER_IS_TRACED) - { - dns46_reply_trace_t *t = - vlib_add_trace (vm, node, b1, sizeof (*t)); - t->sw_if_index = sw_if_index1; - t->next_index = next1; - } - } - - /* verify speculative enqueues, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x2 (vm, node, next_index, - to_next, n_left_to_next, - bi0, bi1, next0, next1); - } -#endif - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 next0 = DNS46_REPLY_NEXT_DROP; - dns_header_t *d0; - u32 pool_index0 = ~0; - u32 error0 = 0; - u8 *resp0 = 0; - - /* speculatively enqueue b0 to the current next frame */ - 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); - d0 = vlib_buffer_get_current (b0); - if (PREDICT_FALSE (dm->is_enabled == 0)) - { - next0 = DNS46_REPLY_NEXT_PUNT; - error0 = DNS46_REPLY_ERROR_DISABLED; - goto done0; - } - - pool_index0 = clib_host_to_net_u16 (d0->id); - - /* Save the reply */ - vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1); - clib_memcpy_fast (resp0, d0, vlib_buffer_length_in_chain (vm, b0)); - - /* - * Deal with everything in process ctx on the main thread - */ - vlib_process_signal_event_mt (vm, dm->resolver_process_node_index, - DNS_RESOLVER_EVENT_RESOLVED, - (uword) resp0); - error0 = DNS46_REPLY_ERROR_PROCESSED; - - done0: - b0->error = node->errors[error0]; - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - dns46_reply_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->disposition = error0; - t->pool_index = pool_index0; - } - - /* verify speculative enqueue, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - return frame->n_vectors; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (dns46_reply_node) = -{ - .function = dns46_reply_node_fn, - .name = "dns46_reply", - .vector_size = sizeof (u32), - .format_trace = format_dns46_reply_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - .n_errors = ARRAY_LEN (dns46_reply_error_strings), - .error_strings = dns46_reply_error_strings, - .n_next_nodes = DNS46_REPLY_N_NEXT, - .next_nodes = { - [DNS46_REPLY_NEXT_DROP] = "error-drop", - [DNS46_REPLY_NEXT_PUNT] = "error-punt", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/dns/request_node.c b/src/vnet/dns/request_node.c deleted file mode 100644 index f9ad7cc0ad8..00000000000 --- a/src/vnet/dns/request_node.c +++ /dev/null @@ -1,344 +0,0 @@ -/* - * Copyright (c) 2017 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 <vnet/dns/dns.h> - -#include <vlib/vlib.h> -#include <vnet/vnet.h> - -vlib_node_registration_t dns46_request_node; - -typedef struct -{ - u32 pool_index; - u32 disposition; -} dns46_request_trace_t; - -/* packet trace format function */ -static u8 * -format_dns46_request_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 *); - dns46_request_trace_t *t = va_arg (*args, dns46_request_trace_t *); - - s = format (s, "DNS46_REPLY: pool index %d, disposition %d", - t->pool_index, t->disposition); - return s; -} - -vlib_node_registration_t dns46_request_node; - -static char *dns46_request_error_strings[] = { -#define _(sym,string) string, - foreach_dns46_request_error -#undef _ -}; - -typedef enum -{ - DNS46_REQUEST_NEXT_DROP, - DNS46_REQUEST_NEXT_IP_LOOKUP, - DNS46_REQUEST_NEXT_PUNT, - DNS46_REQUEST_N_NEXT, -} dns46_request_next_t; - -static uword -dns46_request_inline (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame, - int is_ip6) -{ - u32 n_left_from, *from, *to_next; - dns46_request_next_t next_index; - dns_main_t *dm = &dns_main; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - 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); - -#if 0 - while (n_left_from >= 4 && n_left_to_next >= 2) - { - u32 next0 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT; - u32 next1 = DNS46_REQUEST_NEXT_INTERFACE_OUTPUT; - u32 sw_if_index0, sw_if_index1; - u8 tmp0[6], tmp1[6]; - ethernet_header_t *en0, *en1; - u32 bi0, bi1; - vlib_buffer_t *b0, *b1; - - /* Prefetch next iteration. */ - { - vlib_buffer_t *p2, *p3; - - p2 = vlib_get_buffer (vm, from[2]); - p3 = vlib_get_buffer (vm, from[3]); - - vlib_prefetch_buffer_header (p2, LOAD); - vlib_prefetch_buffer_header (p3, LOAD); - - CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); - } - - /* speculatively enqueue b0 and b1 to the current next frame */ - to_next[0] = bi0 = from[0]; - to_next[1] = bi1 = from[1]; - from += 2; - to_next += 2; - n_left_from -= 2; - n_left_to_next -= 2; - - b0 = vlib_get_buffer (vm, bi0); - b1 = vlib_get_buffer (vm, bi1); - - /* $$$$$ End of processing 2 x packets $$$$$ */ - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) - { - if (b0->flags & VLIB_BUFFER_IS_TRACED) - { - dns46_request_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->sw_if_index = sw_if_index0; - t->next_index = next0; - } - if (b1->flags & VLIB_BUFFER_IS_TRACED) - { - dns46_request_trace_t *t = - vlib_add_trace (vm, node, b1, sizeof (*t)); - t->sw_if_index = sw_if_index1; - t->next_index = next1; - } - } - - /* verify speculative enqueues, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x2 (vm, node, next_index, - to_next, n_left_to_next, - bi0, bi1, next0, next1); - } -#endif - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 next0 = DNS46_REQUEST_NEXT_DROP; - u32 error0 = DNS46_REQUEST_ERROR_NONE; - udp_header_t *u0; - dns_header_t *d0; - dns_query_t *q0; - ip4_header_t *ip40 = 0; - ip6_header_t *ip60 = 0; - dns_cache_entry_t *ep0; - dns_pending_request_t _t0, *t0 = &_t0; - u16 flags0; - u32 pool_index0 = ~0; - u8 *name0; - u8 *label0; - - /* speculatively enqueue b0 to the current next frame */ - 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); - d0 = vlib_buffer_get_current (b0); - u0 = (udp_header_t *) ((u8 *) d0 - sizeof (*u0)); - - if (PREDICT_FALSE (dm->is_enabled == 0)) - { - next0 = DNS46_REQUEST_NEXT_PUNT; - goto done0; - } - - if (is_ip6) - { - ip60 = (ip6_header_t *) (((u8 *) u0) - sizeof (ip6_header_t)); - next0 = DNS46_REQUEST_NEXT_DROP; - error0 = DNS46_REQUEST_ERROR_UNIMPLEMENTED; - goto done0; - } - else - { - ip40 = (ip4_header_t *) (((u8 *) u0) - sizeof (ip4_header_t)); - if (ip40->ip_version_and_header_length != 0x45) - { - error0 = DNS46_REQUEST_ERROR_IP_OPTIONS; - goto done0; - } - } - /* Parse through the DNS request */ - flags0 = clib_net_to_host_u16 (d0->flags); - - /* Requests only */ - if (flags0 & DNS_QR) - { - next0 = DNS46_REQUEST_NEXT_DROP; - error0 = DNS46_REQUEST_ERROR_BAD_REQUEST; - goto done0; - } - if (clib_net_to_host_u16 (d0->qdcount) != 1) - { - next0 = DNS46_REQUEST_NEXT_DROP; - error0 = DNS46_REQUEST_ERROR_TOO_MANY_REQUESTS; - goto done0; - } - - label0 = (u8 *) (d0 + 1); - - /* - * vnet_dns_labels_to_name produces a non NULL terminated vector - * vnet_dns_resolve_name expects a C-string. - */ - name0 = vnet_dns_labels_to_name (label0, (u8 *) d0, (u8 **) & q0); - vec_add1 (name0, 0); - _vec_len (name0) -= 1; - - t0->request_type = DNS_PEER_PENDING_NAME_TO_IP; - - /* - * See if this is a reverse lookup. Both ip4 and ip6 reverse - * requests end with ".arpa" - */ - if (PREDICT_TRUE (vec_len (name0) > 5)) - { - u8 *aptr0 = name0 + vec_len (name0) - 5; - - if (!memcmp (aptr0, ".arpa", 5)) - t0->request_type = DNS_PEER_PENDING_IP_TO_NAME; - } - - t0->client_index = ~0; - t0->is_ip6 = is_ip6; - t0->dst_port = u0->src_port; - t0->id = d0->id; - t0->name = name0; - if (is_ip6) - clib_memcpy_fast (t0->dst_address, ip60->src_address.as_u8, - sizeof (ip6_address_t)); - else - clib_memcpy_fast (t0->dst_address, ip40->src_address.as_u8, - sizeof (ip4_address_t)); - - vnet_dns_resolve_name (dm, name0, t0, &ep0); - - if (ep0) - { - if (is_ip6) - vnet_send_dns6_reply (dm, t0, ep0, b0); - else - vnet_send_dns4_reply (dm, t0, ep0, b0); - next0 = DNS46_REQUEST_NEXT_IP_LOOKUP; - } - else - { - error0 = DNS46_REQUEST_ERROR_RESOLUTION_REQUIRED; - } - - done0: - b0->error = node->errors[error0]; - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - dns46_request_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->disposition = error0; - t->pool_index = pool_index0; - } - - /* verify speculative enqueue, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - return frame->n_vectors; -} - -static uword -dns4_request_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - - return dns46_request_inline (vm, node, frame, 0 /* is_ip6 */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (dns4_request_node) = -{ - .function = dns4_request_node_fn, - .name = "dns4-request", - .vector_size = sizeof (u32), - .format_trace = format_dns46_request_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - .n_errors = ARRAY_LEN (dns46_request_error_strings), - .error_strings = dns46_request_error_strings, - .n_next_nodes = DNS46_REQUEST_N_NEXT, - .next_nodes = { - [DNS46_REQUEST_NEXT_DROP] = "error-drop", - [DNS46_REQUEST_NEXT_PUNT] = "error-punt", - [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip4-lookup", - }, -}; -/* *INDENT-ON* */ - -static uword -dns6_request_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - - return dns46_request_inline (vm, node, frame, 1 /* is_ip6 */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (dns6_request_node) = -{ - .function = dns6_request_node_fn, - .name = "dns6-request", - .vector_size = sizeof (u32), - .format_trace = format_dns46_request_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - .n_errors = ARRAY_LEN (dns46_request_error_strings), - .error_strings = dns46_request_error_strings, - .n_next_nodes = DNS46_REQUEST_N_NEXT, - .next_nodes = { - [DNS46_REQUEST_NEXT_DROP] = "error-drop", - [DNS46_REQUEST_NEXT_PUNT] = "error-punt", - [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip6-lookup", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/dns/resolver_process.c b/src/vnet/dns/resolver_process.c deleted file mode 100644 index 4ed7c799ce2..00000000000 --- a/src/vnet/dns/resolver_process.c +++ /dev/null @@ -1,378 +0,0 @@ -/* - * Copyright (c) 2017 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 <vnet/dns/dns.h> -#include <vlibapi/api.h> -#include <vlibmemory/api.h> - -#include <vlib/vlib.h> -#include <vnet/vnet.h> - -#include <vnet/vnet_msg_enum.h> - -#define vl_typedefs /* define message structures */ -#include <vnet/vnet_all_api_h.h> -#undef vl_typedefs - -#define vl_endianfun /* define message structures */ -#include <vnet/vnet_all_api_h.h> -#undef vl_endianfun - -/* instantiate all the print functions we know about */ -#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__) -#define vl_printfun -#include <vnet/vnet_all_api_h.h> -#undef vl_printfun - -#include <vlibapi/api_helper_macros.h> - -extern int -vnet_dns_response_to_reply (u8 * response, - vl_api_dns_resolve_name_reply_t * rmp, - u32 * min_ttlp); -extern int -vnet_dns_response_to_name (u8 * response, - vl_api_dns_resolve_ip_reply_t * rmp, - u32 * min_ttlp); - -static void -resolve_event (dns_main_t * dm, f64 now, u8 * reply) -{ - vlib_main_t *vm = dm->vlib_main; - dns_pending_request_t *pr; - dns_header_t *d; - u32 pool_index; - dns_cache_entry_t *ep; - u32 min_ttl; - u16 flags; - u16 rcode; - int i; - int entry_was_valid; - int remove_count; - int rv = 0; - - d = (dns_header_t *) reply; - flags = clib_net_to_host_u16 (d->flags); - rcode = flags & DNS_RCODE_MASK; - - /* $$$ u16 limits cache to 65K entries, fix later multiple dst ports */ - pool_index = clib_net_to_host_u16 (d->id); - dns_cache_lock (dm); - - if (pool_is_free_index (dm->entries, pool_index)) - { - vec_free (reply); - if (0) - clib_warning ("pool index %d is free", pool_index); - vlib_node_increment_counter (vm, dns46_reply_node.index, - DNS46_REPLY_ERROR_NO_ELT, 1); - dns_cache_unlock (dm); - return; - } - - ep = pool_elt_at_index (dm->entries, pool_index); - - if (ep->dns_response) - vec_free (ep->dns_response); - - /* Handle [sic] recursion AKA CNAME indirection */ - rv = vnet_dns_cname_indirection_nolock (dm, pool_index, reply); - - /* CNAME found, further resolution pending, we're done here */ - if (rv > 0) - { - dns_cache_unlock (dm); - return; - } - /* Server backfire: refused to answer, or sent zero replies */ - if (rv < 0) - { - /* Try a different server */ - if (ep->server_af /* ip6 */ ) - { - if (0) - clib_warning ("Server %U failed to resolve '%s'", - format_ip6_address, - dm->ip6_name_servers + ep->server_rotor, ep->name); - /* Any more servers to try? */ - if (ep->server_fails > 1 || vec_len (dm->ip6_name_servers) <= 1) - { - /* No, tell the client to go away */ - goto reply; - } - ep->retry_count = 0; - ep->server_rotor++; - ep->server_fails++; - if (ep->server_rotor >= vec_len (dm->ip6_name_servers)) - ep->server_rotor = 0; - if (0) - clib_warning ("Try server %U", format_ip6_address, - dm->ip6_name_servers + ep->server_rotor); - vnet_dns_send_dns6_request - (dm, ep, dm->ip6_name_servers + ep->server_rotor); - } - else - { - if (0) - clib_warning ("Server %U failed to resolve '%s'", - format_ip4_address, - dm->ip4_name_servers + ep->server_rotor, ep->name); - - if (ep->server_fails > 1 || vec_len (dm->ip4_name_servers) <= 1) - { - /* No, tell the client to go away */ - goto reply; - } - ep->retry_count = 0; - ep->server_rotor++; - ep->server_fails++; - if (ep->server_rotor >= vec_len (dm->ip4_name_servers)) - ep->server_rotor = 0; - if (0) - clib_warning ("Try server %U", format_ip4_address, - dm->ip4_name_servers + ep->server_rotor); - vnet_dns_send_dns4_request - (dm, ep, dm->ip4_name_servers + ep->server_rotor); - } - dns_cache_unlock (dm); - return; - } - -reply: - /* Save the response */ - ep->dns_response = reply; - - /* - * Pick a sensible default cache entry expiration time. - * We don't play the 10-second timeout game. - */ - ep->expiration_time = now + 600.0; - - if (0) - clib_warning ("resolving '%s', was %s valid", - ep->name, (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) ? - "already" : "not"); - /* - * The world is a mess. A single DNS request sent to e.g. 8.8.8.8 - * may yield multiple, subtly different responses - all with the same - * DNS protocol-level ID. - * - * Last response wins in terms of what ends up in the cache. - * First response wins in terms of the response sent to the client. - */ - - /* Strong hint that we may not find a pending resolution entry */ - entry_was_valid = (ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) ? 1 : 0; - - if (vec_len (ep->dns_response)) - ep->flags |= DNS_CACHE_ENTRY_FLAG_VALID; - - /* Most likely, send 1 message */ - for (i = 0; i < vec_len (ep->pending_requests); i++) - { - vl_api_registration_t *regp; - - pr = vec_elt_at_index (ep->pending_requests, i); - - switch (pr->request_type) - { - case DNS_API_PENDING_NAME_TO_IP: - { - vl_api_dns_resolve_name_reply_t *rmp; - regp = vl_api_client_index_to_registration (pr->client_index); - if (regp == 0) - continue; - - rmp = vl_msg_api_alloc (sizeof (*rmp)); - rmp->_vl_msg_id = - clib_host_to_net_u16 (VL_API_DNS_RESOLVE_NAME_REPLY); - rmp->context = pr->client_context; - min_ttl = ~0; - rv = vnet_dns_response_to_reply (ep->dns_response, rmp, &min_ttl); - if (min_ttl != ~0) - ep->expiration_time = now + min_ttl; - rmp->retval = clib_host_to_net_u32 (rv); - vl_api_send_msg (regp, (u8 *) rmp); - } - break; - - case DNS_API_PENDING_IP_TO_NAME: - { - vl_api_dns_resolve_ip_reply_t *rmp; - - regp = vl_api_client_index_to_registration (pr->client_index); - if (regp == 0) - continue; - - rmp = vl_msg_api_alloc (sizeof (*rmp)); - rmp->_vl_msg_id = - clib_host_to_net_u16 (VL_API_DNS_RESOLVE_IP_REPLY); - rmp->context = pr->client_context; - min_ttl = ~0; - rv = vnet_dns_response_to_name (ep->dns_response, rmp, &min_ttl); - if (min_ttl != ~0) - ep->expiration_time = now + min_ttl; - rmp->retval = clib_host_to_net_u32 (rv); - vl_api_send_msg (regp, (u8 *) rmp); - } - break; - - case DNS_PEER_PENDING_IP_TO_NAME: - case DNS_PEER_PENDING_NAME_TO_IP: - if (pr->is_ip6) - vnet_send_dns6_reply (dm, pr, ep, 0 /* allocate a buffer */ ); - else - vnet_send_dns4_reply (dm, pr, ep, 0 /* allocate a buffer */ ); - break; - default: - clib_warning ("request type %d unknown", pr->request_type); - break; - } - } - vec_free (ep->pending_requests); - - remove_count = 0; - for (i = 0; i < vec_len (dm->unresolved_entries); i++) - { - if (dm->unresolved_entries[i] == pool_index) - { - vec_delete (dm->unresolved_entries, 1, i); - remove_count++; - i--; - } - } - /* See multiple response comment above... */ - if (remove_count == 0) - { - u32 error_code = entry_was_valid ? DNS46_REPLY_ERROR_MULTIPLE_REPLY : - DNS46_REPLY_ERROR_NO_UNRESOLVED_ENTRY; - - vlib_node_increment_counter (vm, dns46_reply_node.index, error_code, 1); - dns_cache_unlock (dm); - return; - } - - /* Deal with bogus names, server issues, etc. */ - switch (rcode) - { - default: - case DNS_RCODE_NO_ERROR: - break; - - case DNS_RCODE_SERVER_FAILURE: - case DNS_RCODE_NOT_IMPLEMENTED: - case DNS_RCODE_REFUSED: - if (ep->server_af == 0) - clib_warning ("name server %U can't resolve '%s'", - format_ip4_address, - dm->ip4_name_servers + ep->server_rotor, ep->name); - else - clib_warning ("name server %U can't resolve '%s'", - format_ip6_address, - dm->ip6_name_servers + ep->server_rotor, ep->name); - /* FALLTHROUGH */ - case DNS_RCODE_NAME_ERROR: - case DNS_RCODE_FORMAT_ERROR: - /* remove trash from the cache... */ - vnet_dns_delete_entry_by_index_nolock (dm, ep - dm->entries); - break; - } - - - dns_cache_unlock (dm); - return; -} - -static void -retry_scan (dns_main_t * dm, f64 now) -{ - int i; - dns_cache_entry_t *ep; - - for (i = 0; i < vec_len (dm->unresolved_entries); i++) - { - dns_cache_lock (dm); - ep = pool_elt_at_index (dm->entries, dm->unresolved_entries[i]); - - ASSERT ((ep->flags & DNS_CACHE_ENTRY_FLAG_VALID) == 0); - vnet_send_dns_request (dm, ep); - dns_cache_unlock (dm); - } -} - -static uword -dns_resolver_process (vlib_main_t * vm, - vlib_node_runtime_t * rt, vlib_frame_t * f) -{ - dns_main_t *dm = &dns_main; - f64 now; - f64 timeout = 1000.0; - uword *event_data = 0; - uword event_type; - int i; - - while (1) - { - vlib_process_wait_for_event_or_clock (vm, timeout); - - now = vlib_time_now (vm); - - event_type = vlib_process_get_events (vm, (uword **) & event_data); - - switch (event_type) - { - /* Send one of these when a resolution is pending */ - case DNS_RESOLVER_EVENT_PENDING: - timeout = 2.0; - break; - - case DNS_RESOLVER_EVENT_RESOLVED: - for (i = 0; i < vec_len (event_data); i++) - resolve_event (dm, now, (u8 *) event_data[i]); - break; - - case ~0: /* timeout */ - retry_scan (dm, now); - break; - } - vec_reset_length (event_data); - - /* No work? Back to slow timeout mode... */ - if (vec_len (dm->unresolved_entries) == 0) - timeout = 1000.0; - } - return 0; /* or not */ -} - -void -vnet_dns_create_resolver_process (dns_main_t * dm) -{ - /* Already created the resolver process? */ - if (dm->resolver_process_node_index > 0) - return; - - /* No, create it now and make a note of the node index */ - dm->resolver_process_node_index = vlib_process_create - (dm->vlib_main, "dns-resolver-process", - dns_resolver_process, 16 /* log2_n_stack_bytes */ ); -} - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |