master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
33 */
34
35#ifndef _NETINET_UDP_VAR_H_
36#define _NETINET_UDP_VAR_H_
37
38#include <sys/types.h>
39#include <netinet/ip_var.h>
40#include <netinet/udp.h>
41
42/*
43 * UDP kernel structures and variables.
44 */
45struct udpiphdr {
46 struct ipovly ui_i; /* overlaid ip structure */
47 struct udphdr ui_u; /* udp header */
48};
49#define ui_x1 ui_i.ih_x1
50#define ui_v ui_i.ih_x1[0]
51#define ui_pr ui_i.ih_pr
52#define ui_len ui_i.ih_len
53#define ui_src ui_i.ih_src
54#define ui_dst ui_i.ih_dst
55#define ui_sport ui_u.uh_sport
56#define ui_dport ui_u.uh_dport
57#define ui_ulen ui_u.uh_ulen
58#define ui_sum ui_u.uh_sum
59
60/*
61 * Identifiers for UDP sysctl nodes.
62 */
63#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
64#define UDPCTL_STATS 2 /* statistics (read-only) */
65#define UDPCTL_MAXDGRAM 3 /* max datagram size */
66#define UDPCTL_RECVSPACE 4 /* default receive buffer space */
67#define UDPCTL_PCBLIST 5 /* list of PCBs for UDP sockets */
68
69 /* IPsec: ESP in UDP tunneling: */
70#define UF_ESPINUDP_NON_IKE 0x00000001 /* w/ non-IKE marker .. */
71 /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
72 * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
73#define UF_ESPINUDP 0x00000002 /* w/ non-ESP marker. */
74
75struct udpstat {
76 /* input statistics: */
77 uint64_t udps_ipackets; /* total input packets */
78 uint64_t udps_hdrops; /* packet shorter than header */
79 uint64_t udps_badsum; /* checksum error */
80 uint64_t udps_nosum; /* no checksum */
81 uint64_t udps_badlen; /* data length larger than packet */
82 uint64_t udps_noport; /* no socket on port */
83 uint64_t udps_noportbcast; /* of above, arrived as broadcast */
84 uint64_t udps_fullsock; /* not delivered, input socket full */
85 uint64_t udpps_pcbcachemiss; /* input packets missing pcb cache */
86 uint64_t udpps_pcbhashmiss; /* input packets not for hashed pcb */
87 /* output statistics: */
88 uint64_t udps_opackets; /* total output packets */
89 uint64_t udps_fastout; /* output packets on fast path */
90 /* of no socket on port, arrived as multicast */
91 uint64_t udps_noportmcast;
92 uint64_t udps_filtermcast; /* blocked by multicast filter */
93};
94
95#ifdef _KERNEL
96#include <netinet/in_pcb.h>
97#include <sys/counter.h>
98struct mbuf;
99
100typedef bool udp_tun_func_t(struct mbuf *, int, struct inpcb *,
101 const struct sockaddr *, void *);
102typedef union {
103 struct icmp *icmp;
104 struct ip6ctlparam *ip6cp;
105} udp_tun_icmp_param_t __attribute__((__transparent_union__));
106typedef void udp_tun_icmp_t(udp_tun_icmp_param_t);
107
108/*
109 * UDP control block; one per udp.
110 */
111struct udpcb {
112 struct inpcb u_inpcb;
113#define u_start_zero u_tun_func
114#define u_zero_size (sizeof(struct udpcb) - \
115 offsetof(struct udpcb, u_start_zero))
116 udp_tun_func_t *u_tun_func; /* UDP kernel tunneling callback. */
117 udp_tun_icmp_t *u_icmp_func; /* UDP kernel tunneling icmp callback */
118 u_int u_flags; /* Generic UDP flags. */
119 uint16_t u_rxcslen; /* Coverage for incoming datagrams. */
120 uint16_t u_txcslen; /* Coverage for outgoing datagrams. */
121 void *u_tun_ctx; /* Tunneling callback context. */
122};
123
124#define intoudpcb(ip) __containerof((inp), struct udpcb, u_inpcb)
125#define sotoudpcb(so) (intoudpcb(sotoinpcb(so)))
126
127VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
128/*
129 * In-kernel consumers can use these accessor macros directly to update
130 * stats.
131 */
132#define UDPSTAT_ADD(name, val) \
133 VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
134#define UDPSTAT_INC(name) UDPSTAT_ADD(name, 1)
135
136/*
137 * Kernel module consumers must use this accessor macro.
138 */
139void kmod_udpstat_inc(int statnum);
140#define KMOD_UDPSTAT_INC(name) \
141 kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
142
143SYSCTL_DECL(_net_inet_udp);
144
145VNET_DECLARE(struct inpcbinfo, udbinfo);
146VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
147#define V_udbinfo VNET(udbinfo)
148#define V_ulitecbinfo VNET(ulitecbinfo)
149
150extern u_long udp_sendspace;
151extern u_long udp_recvspace;
152VNET_DECLARE(int, udp_cksum);
153VNET_DECLARE(int, udp_blackhole);
154VNET_DECLARE(bool, udp_blackhole_local);
155VNET_DECLARE(int, udp_log_in_vain);
156#define V_udp_cksum VNET(udp_cksum)
157#define V_udp_blackhole VNET(udp_blackhole)
158#define V_udp_blackhole_local VNET(udp_blackhole_local)
159#define V_udp_log_in_vain VNET(udp_log_in_vain)
160
161VNET_DECLARE(int, zero_checksum_port);
162#define V_zero_checksum_port VNET(zero_checksum_port)
163
164static __inline struct inpcbinfo *
165udp_get_inpcbinfo(int protocol)
166{
167 return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
168}
169
170int udp_ctloutput(struct socket *, struct sockopt *);
171void udplite_input(struct mbuf *, int);
172struct inpcb *udp_notify(struct inpcb *inp, int errno);
173int udp_shutdown(struct socket *so);
174
175int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
176 udp_tun_icmp_t i, void *ctx);
177
178#ifdef _SYS_PROTOSW_H_
179pr_abort_t udp_abort;
180pr_disconnect_t udp_disconnect;
181pr_send_t udp_send;
182#endif
183
184#endif /* _KERNEL */
185
186#endif /* _NETINET_UDP_VAR_H_ */