2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * @file syslog protocol UDP transport layer implementation (RFC5426)
19 #include <vnet/syslog/syslog_udp.h>
20 #include <vnet/ip/ip4.h>
21 #include <vnet/udp/udp_packet.h>
24 syslog_add_udp_transport (vlib_main_t * vm, u32 bi)
26 syslog_main_t *sm = &syslog_main;
27 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
31 vlib_buffer_advance (b, -(sizeof (ip4_header_t) + sizeof (udp_header_t)));
33 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
34 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
35 vnet_buffer (b)->sw_if_index[VLIB_TX] = sm->fib_index;
37 ip = vlib_buffer_get_current (b);
38 clib_memset (ip, 0, sizeof (*ip));
39 udp = (udp_header_t *) (ip + 1);
40 clib_memset (udp, 0, sizeof (*udp));
42 ip->ip_version_and_header_length = 0x45;
43 ip->flags_and_fragment_offset =
44 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
46 ip->protocol = IP_PROTOCOL_UDP;
47 ip->src_address.as_u32 = sm->src_address.as_u32;
48 ip->dst_address.as_u32 = sm->collector.as_u32;
50 udp->src_port = udp->dst_port = clib_host_to_net_u16 (sm->collector_port);
52 const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
53 ip->length = clib_host_to_net_u16 (ip_length);
54 ip->checksum = ip4_header_checksum (ip);
56 const u16 udp_length = ip_length - (sizeof (ip4_header_t));
57 udp->length = clib_host_to_net_u16 (udp_length);
59 udp->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip);
60 if (udp->checksum == 0)
61 udp->checksum = 0xffff;
63 b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
67 * fd.io coding-style-patch-verification: ON
70 * eval: (c-set-style "gnu")