/* * Copyright (c) 2018 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. */ /** * @file syslog_udp.c * syslog protocol UDP transport layer implementation (RFC5426) */ #include <vnet/syslog/syslog_udp.h> #include <vnet/ip/ip4.h> #include <vnet/udp/udp_packet.h> void syslog_add_udp_transport (vlib_main_t * vm, u32 bi) { syslog_main_t *sm = &syslog_main; vlib_buffer_t *b = vlib_get_buffer (vm, bi); ip4_header_t *ip; udp_header_t *udp; vlib_buffer_advance (b, -(sizeof (ip4_header_t) + sizeof (udp_header_t))); b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; vnet_buffer (b)->sw_if_index[VLIB_TX] = sm->fib_index; ip = vlib_buffer_get_current (b); clib_memset (ip, 0, sizeof (*ip)); udp = (udp_header_t *) (ip + 1); clib_memset (udp, 0, sizeof (*udp)); ip->ip_version_and_header_length = 0x45; ip->flags_and_fragment_offset = clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT); ip->ttl = 255; ip->protocol = IP_PROTOCOL_UDP; ip->src_address.as_u32 = sm->src_address.as_u32; ip->dst_address.as_u32 = sm->collector.as_u32; udp->src_port = udp->dst_port = clib_host_to_net_u16 (sm->collector_port); const u16 ip_length = vlib_buffer_length_in_chain (vm, b); ip->length = clib_host_to_net_u16 (ip_length); ip->checksum = ip4_header_checksum (ip); const u16 udp_length = ip_length - (sizeof (ip4_header_t)); udp->length = clib_host_to_net_u16 (udp_length); /* RFC5426 3.6. */ udp->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip); if (udp->checksum == 0) udp->checksum = 0xffff; b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */