VPP-1027: DNS name resolver - vpp - Vector Packet Processing

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author	Dave Barach <dave@barachs.net>	2017-10-10 17:53:14 -0400
committer	Florin Coras <florin.coras@gmail.com>	2017-10-13 20:20:09 +0000
commit	6545716c073c88ad86458620c6dbc59ba1cd00bb (patch)
tree	2bd8b7d9cd0e221669081aba27786e1ce5eee964 /src/vnet/udp
parent	7e550693dffd368b9dd8e0397674cfc4d10f9579 (diff)

VPP-1027: DNS name resolver

This patch is a plausible first-cut, suitable for initial testing by vcl (host stack client library). Main features; - recursive name resolution - multiple ip4/ip6 name servers - cache size limit enforcement - currently limited to 65K - ttl / aging - static mapping support - show / clear / debug CLI commands Binary APIs provided for the following: - add/delete name servers - enable/disable the name cache - resolve a name To Do list: - Respond to ip4/ip6 client DNS requests (vs. binary API requests) - Perf / scale tuning - map pending transaction ids to pool indices, so the cache can (greatly) exceed 65K entries - Security improvements - Use unpredictable dns transaction IDs, related to previous item - Make sure that response-packet src ip addresses match the server - Add binary APIs - deliver raw response data to clients - control recursive name resolution - Documentation Change-Id: I48c373d5c05d7108ccd814d4055caf8c75ca10b7 Signed-off-by: Dave Barach <dave@barachs.net>

Diffstat (limited to 'src/vnet/udp')

-rw-r--r--

src/vnet/udp/udp.h

1 files changed, 6 insertions, 2 deletions

/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* Copyright (c) 2005 Eliot Dresselhaus Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <vppinfra/clib.h> #include <vppinfra/longjmp.h> #include <vppinfra/format.h> static void test_calljmp (unformat_input_t * input); static int i; static int verbose; #define if_verbose(format,args...) \ if (verbose) { clib_warning(format, ## args); } static never_inline void f2 (clib_longjmp_t * env) { i++; clib_longjmp (env, 1); } static never_inline void f1 (clib_longjmp_t * env) { i++; f2 (env); } int test_longjmp_main (unformat_input_t * input) { clib_longjmp_t env; i = 0; if (clib_setjmp (&env, 0) == 0) { if_verbose ("calling long jumper %d", i); f1 (&env); } if_verbose ("back from long jump %d", i); test_calljmp (input); return 0; } static uword f3 (uword arg) { uword i, j, array[10]; for (i = 0; i < ARRAY_LEN (array); i++) array[i] = arg + i; j = 0; for (i = 0; i < ARRAY_LEN (array); i++) j ^= array[i]; return j; } static void test_calljmp (unformat_input_t * input) { static u8 stack[32 * 1024] __attribute__ ((aligned (16))); uword v; v = clib_calljmp (f3, 0, stack + sizeof (stack)); ASSERT (v == f3 (0)); if_verbose ("calljump ok"); } #ifdef CLIB_UNIX int main (int argc, char *argv[]) { unformat_input_t i; int res; clib_mem_init (0, 64 << 20); verbose = (argc > 1); unformat_init_command_line (&i, argv); res = test_longjmp_main (&i); unformat_free (&i); return res; } #endif /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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