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/*
* 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:
*/
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