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
33 #ifndef _NETINET_UDP_VAR_H_
34 #define _NETINET_UDP_VAR_H_
35
36 #include <sys/types.h>
37 #include <netinet/ip_var.h>
38 #include <netinet/udp.h>
39
40 /*
41 * UDP kernel structures and variables.
42 */
43 struct udpiphdr {
44 struct ipovly ui_i; /* overlaid ip structure */
45 struct udphdr ui_u; /* udp header */
46 };
47 #define ui_x1 ui_i.ih_x1
48 #define ui_v ui_i.ih_x1[0]
49 #define ui_pr ui_i.ih_pr
50 #define ui_len ui_i.ih_len
51 #define ui_src ui_i.ih_src
52 #define ui_dst ui_i.ih_dst
53 #define ui_sport ui_u.uh_sport
54 #define ui_dport ui_u.uh_dport
55 #define ui_ulen ui_u.uh_ulen
56 #define ui_sum ui_u.uh_sum
57
58 /*
59 * Identifiers for UDP sysctl nodes.
60 */
61 #define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
62 #define UDPCTL_STATS 2 /* statistics (read-only) */
63 #define UDPCTL_MAXDGRAM 3 /* max datagram size */
64 #define UDPCTL_RECVSPACE 4 /* default receive buffer space */
65 #define UDPCTL_PCBLIST 5 /* list of PCBs for UDP sockets */
66
67 /* IPsec: ESP in UDP tunneling: */
68 #define UF_ESPINUDP_NON_IKE 0x00000001 /* w/ non-IKE marker .. */
69 /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
70 * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
71 #define UF_ESPINUDP 0x00000002 /* w/ non-ESP marker. */
72
73 struct udpstat {
74 /* input statistics: */
75 uint64_t udps_ipackets; /* total input packets */
76 uint64_t udps_hdrops; /* packet shorter than header */
77 uint64_t udps_badsum; /* checksum error */
78 uint64_t udps_nosum; /* no checksum */
79 uint64_t udps_badlen; /* data length larger than packet */
80 uint64_t udps_noport; /* no socket on port */
81 uint64_t udps_noportbcast; /* of above, arrived as broadcast */
82 uint64_t udps_fullsock; /* not delivered, input socket full */
83 uint64_t udpps_pcbcachemiss; /* input packets missing pcb cache */
84 uint64_t udpps_pcbhashmiss; /* input packets not for hashed pcb */
85 /* output statistics: */
86 uint64_t udps_opackets; /* total output packets */
87 uint64_t udps_fastout; /* output packets on fast path */
88 /* of no socket on port, arrived as multicast */
89 uint64_t udps_noportmcast;
90 uint64_t udps_filtermcast; /* blocked by multicast filter */
91 };
92
93 #ifdef _KERNEL
94 #include <netinet/in_pcb.h>
95 #include <sys/counter.h>
96 #include <netinet/in_kdtrace.h>
97 struct mbuf;
98
99 typedef bool udp_tun_func_t(struct mbuf *, int, struct inpcb *,
100 const struct sockaddr *, void *);
101 typedef union {
102 struct icmp *icmp;
103 struct ip6ctlparam *ip6cp;
104 } udp_tun_icmp_param_t __attribute__((__transparent_union__));
105 typedef void udp_tun_icmp_t(udp_tun_icmp_param_t);
106
107 /*
108 * UDP control block; one per udp.
109 */
110 struct udpcb {
111 struct inpcb u_inpcb;
112 #define u_start_zero u_tun_func
113 #define u_zero_size (sizeof(struct udpcb) - \
114 offsetof(struct udpcb, u_start_zero))
115 udp_tun_func_t *u_tun_func; /* UDP kernel tunneling callback. */
116 udp_tun_icmp_t *u_icmp_func; /* UDP kernel tunneling icmp callback */
117 u_int u_flags; /* Generic UDP flags. */
118 uint16_t u_rxcslen; /* Coverage for incoming datagrams. */
119 uint16_t u_txcslen; /* Coverage for outgoing datagrams. */
120 void *u_tun_ctx; /* Tunneling callback context. */
121 };
122
123 #define intoudpcb(ip) __containerof((inp), struct udpcb, u_inpcb)
124 #define sotoudpcb(so) (intoudpcb(sotoinpcb(so)))
125
126 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
127 /*
128 * In-kernel consumers can use these accessor macros directly to update
129 * stats.
130 */
131 #define UDPSTAT_ADD(name, val) \
132 do { \
133 MIB_SDT_PROBE1(udp, count, name, (val)); \
134 VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val)); \
135 } while (0)
136 #define UDPSTAT_INC(name) UDPSTAT_ADD(name, 1)
137
138 /*
139 * Kernel module consumers must use this accessor macro.
140 */
141 void kmod_udpstat_inc(int statnum);
142 #define KMOD_UDPSTAT_INC(name) \
143 do { \
144 MIB_SDT_PROBE1(udp, count, name, 1); \
145 kmod_udpstat_inc( \
146 offsetof(struct udpstat, name) / sizeof(uint64_t)); \
147 } while (0)
148
149 SYSCTL_DECL(_net_inet_udp);
150
151 VNET_DECLARE(struct inpcbinfo, udbinfo);
152 VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
153 #define V_udbinfo VNET(udbinfo)
154 #define V_ulitecbinfo VNET(ulitecbinfo)
155
156 extern u_long udp_sendspace;
157 extern u_long udp_recvspace;
158 VNET_DECLARE(int, udp_cksum);
159 VNET_DECLARE(int, udp_blackhole);
160 VNET_DECLARE(bool, udp_blackhole_local);
161 VNET_DECLARE(int, udp_log_in_vain);
162 #define V_udp_cksum VNET(udp_cksum)
163 #define V_udp_blackhole VNET(udp_blackhole)
164 #define V_udp_blackhole_local VNET(udp_blackhole_local)
165 #define V_udp_log_in_vain VNET(udp_log_in_vain)
166
167 VNET_DECLARE(int, zero_checksum_port);
168 #define V_zero_checksum_port VNET(zero_checksum_port)
169
170 static __inline struct inpcbinfo *
udp_get_inpcbinfo(int protocol)171 udp_get_inpcbinfo(int protocol)
172 {
173 return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
174 }
175
176 int udp_ctloutput(struct socket *, struct sockopt *);
177 void udplite_input(struct mbuf *, int);
178 struct inpcb *udp_notify(struct inpcb *inp, int errno);
179 int udp_shutdown(struct socket *, enum shutdown_how);
180
181 int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
182 udp_tun_icmp_t i, void *ctx);
183
184 #ifdef _SYS_PROTOSW_H_
185 pr_abort_t udp_abort;
186 pr_disconnect_t udp_disconnect;
187 pr_send_t udp_send;
188 #endif
189
190 #endif /* _KERNEL */
191
192 #endif /* _NETINET_UDP_VAR_H_ */
193