FreeBSD/Linux Kernel Cross Reference
sys/netinet/udp_var.h
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 * $FreeBSD$
34 */
35
36 #ifndef _NETINET_UDP_VAR_H_
37 #define _NETINET_UDP_VAR_H_
38
39 #include <sys/types.h>
40 #include <netinet/ip_var.h>
41 #include <netinet/udp.h>
42
43 /*
44 * UDP kernel structures and variables.
45 */
46 struct udpiphdr {
47 struct ipovly ui_i; /* overlaid ip structure */
48 struct udphdr ui_u; /* udp header */
49 };
50 #define ui_x1 ui_i.ih_x1
51 #define ui_v ui_i.ih_x1[0]
52 #define ui_pr ui_i.ih_pr
53 #define ui_len ui_i.ih_len
54 #define ui_src ui_i.ih_src
55 #define ui_dst ui_i.ih_dst
56 #define ui_sport ui_u.uh_sport
57 #define ui_dport ui_u.uh_dport
58 #define ui_ulen ui_u.uh_ulen
59 #define ui_sum ui_u.uh_sum
60
61 /*
62 * Identifiers for UDP sysctl nodes.
63 */
64 #define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
65 #define UDPCTL_STATS 2 /* statistics (read-only) */
66 #define UDPCTL_MAXDGRAM 3 /* max datagram size */
67 #define UDPCTL_RECVSPACE 4 /* default receive buffer space */
68 #define UDPCTL_PCBLIST 5 /* list of PCBs for UDP sockets */
69
70 /* IPsec: ESP in UDP tunneling: */
71 #define UF_ESPINUDP_NON_IKE 0x00000001 /* w/ non-IKE marker .. */
72 /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
73 * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
74 #define UF_ESPINUDP 0x00000002 /* w/ non-ESP marker. */
75
76 struct udpstat {
77 /* input statistics: */
78 uint64_t udps_ipackets; /* total input packets */
79 uint64_t udps_hdrops; /* packet shorter than header */
80 uint64_t udps_badsum; /* checksum error */
81 uint64_t udps_nosum; /* no checksum */
82 uint64_t udps_badlen; /* data length larger than packet */
83 uint64_t udps_noport; /* no socket on port */
84 uint64_t udps_noportbcast; /* of above, arrived as broadcast */
85 uint64_t udps_fullsock; /* not delivered, input socket full */
86 uint64_t udpps_pcbcachemiss; /* input packets missing pcb cache */
87 uint64_t udpps_pcbhashmiss; /* input packets not for hashed pcb */
88 /* output statistics: */
89 uint64_t udps_opackets; /* total output packets */
90 uint64_t udps_fastout; /* output packets on fast path */
91 /* of no socket on port, arrived as multicast */
92 uint64_t udps_noportmcast;
93 uint64_t udps_filtermcast; /* blocked by multicast filter */
94 };
95
96 #ifdef _KERNEL
97 #include <netinet/in_pcb.h>
98 #include <sys/counter.h>
99 struct mbuf;
100
101 typedef bool udp_tun_func_t(struct mbuf *, int, struct inpcb *,
102 const struct sockaddr *, void *);
103 typedef union {
104 struct icmp *icmp;
105 struct ip6ctlparam *ip6cp;
106 } udp_tun_icmp_param_t __attribute__((__transparent_union__));
107 typedef void udp_tun_icmp_t(udp_tun_icmp_param_t);
108
109 /*
110 * UDP control block; one per udp.
111 */
112 struct udpcb {
113 struct inpcb u_inpcb;
114 #define u_start_zero u_tun_func
115 #define u_zero_size (sizeof(struct udpcb) - \
116 offsetof(struct udpcb, u_start_zero))
117 udp_tun_func_t *u_tun_func; /* UDP kernel tunneling callback. */
118 udp_tun_icmp_t *u_icmp_func; /* UDP kernel tunneling icmp callback */
119 u_int u_flags; /* Generic UDP flags. */
120 uint16_t u_rxcslen; /* Coverage for incoming datagrams. */
121 uint16_t u_txcslen; /* Coverage for outgoing datagrams. */
122 void *u_tun_ctx; /* Tunneling callback context. */
123 };
124
125 #define intoudpcb(ip) __containerof((inp), struct udpcb, u_inpcb)
126 #define sotoudpcb(so) (intoudpcb(sotoinpcb(so)))
127
128 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
129 /*
130 * In-kernel consumers can use these accessor macros directly to update
131 * stats.
132 */
133 #define UDPSTAT_ADD(name, val) \
134 VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
135 #define UDPSTAT_INC(name) UDPSTAT_ADD(name, 1)
136
137 /*
138 * Kernel module consumers must use this accessor macro.
139 */
140 void kmod_udpstat_inc(int statnum);
141 #define KMOD_UDPSTAT_INC(name) \
142 kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
143
144 SYSCTL_DECL(_net_inet_udp);
145
146 VNET_DECLARE(struct inpcbinfo, udbinfo);
147 VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
148 #define V_udbinfo VNET(udbinfo)
149 #define V_ulitecbinfo VNET(ulitecbinfo)
150
151 extern u_long udp_sendspace;
152 extern u_long udp_recvspace;
153 VNET_DECLARE(int, udp_cksum);
154 VNET_DECLARE(int, udp_blackhole);
155 VNET_DECLARE(bool, udp_blackhole_local);
156 VNET_DECLARE(int, udp_log_in_vain);
157 #define V_udp_cksum VNET(udp_cksum)
158 #define V_udp_blackhole VNET(udp_blackhole)
159 #define V_udp_blackhole_local VNET(udp_blackhole_local)
160 #define V_udp_log_in_vain VNET(udp_log_in_vain)
161
162 VNET_DECLARE(int, zero_checksum_port);
163 #define V_zero_checksum_port VNET(zero_checksum_port)
164
165 static __inline struct inpcbinfo *
166 udp_get_inpcbinfo(int protocol)
167 {
168 return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
169 }
170
171 int udp_ctloutput(struct socket *, struct sockopt *);
172 void udplite_input(struct mbuf *, int);
173 struct inpcb *udp_notify(struct inpcb *inp, int errno);
174 int udp_shutdown(struct socket *so);
175
176 int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
177 udp_tun_icmp_t i, void *ctx);
178
179 #ifdef _SYS_PROTOSW_H_
180 pr_abort_t udp_abort;
181 pr_disconnect_t udp_disconnect;
182 pr_send_t udp_send;
183 #endif
184
185 #endif /* _KERNEL */
186
187 #endif /* _NETINET_UDP_VAR_H_ */
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