1 /*-
2  * Copyright (c) 1982, 1986, 1989, 1993
3  *	The Regents of the University of California.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 4. Neither the name of the University nor the names of its contributors
15  *    may be used to endorse or promote products derived from this software
16  *    without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  *	@(#)udp_var.h	8.1 (Berkeley) 6/10/93
31  * $FreeBSD$
32  */
33 
34 #ifndef _NETINET_UDP_VAR_H_
35 #define	_NETINET_UDP_VAR_H_
36 
37 /*
38  * UDP kernel structures and variables.
39  */
40 struct udpiphdr {
41 	struct ipovly	ui_i;		/* overlaid ip structure */
42 	struct udphdr	ui_u;		/* udp header */
43 };
44 #define	ui_x1		ui_i.ih_x1
45 #define	ui_v		ui_i.ih_x1[0]
46 #define	ui_pr		ui_i.ih_pr
47 #define	ui_len		ui_i.ih_len
48 #define	ui_src		ui_i.ih_src
49 #define	ui_dst		ui_i.ih_dst
50 #define	ui_sport	ui_u.uh_sport
51 #define	ui_dport	ui_u.uh_dport
52 #define	ui_ulen		ui_u.uh_ulen
53 #define	ui_sum		ui_u.uh_sum
54 
55 struct inpcb;
56 struct mbuf;
57 
58 typedef void(*udp_tun_func_t)(struct mbuf *, int off, struct inpcb *,
59 			      const struct sockaddr *, void *);
60 
61 /*
62  * UDP control block; one per udp.
63  */
64 struct udpcb {
65 	udp_tun_func_t	u_tun_func;	/* UDP kernel tunneling callback. */
66 	u_int		u_flags;	/* Generic UDP flags. */
67 	uint16_t	u_rxcslen;	/* Coverage for incoming datagrams. */
68 	uint16_t	u_txcslen;	/* Coverage for outgoing datagrams. */
69 	void 		*u_tun_ctx;	/* Tunneling callback context. */
70 };
71 
72 #define	intoudpcb(ip)	((struct udpcb *)(ip)->inp_ppcb)
73 #define	sotoudpcb(so)	(intoudpcb(sotoinpcb(so)))
74 
75 				/* IPsec: ESP in UDP tunneling: */
76 #define	UF_ESPINUDP_NON_IKE	0x00000001	/* w/ non-IKE marker .. */
77 	/* .. per draft-ietf-ipsec-nat-t-ike-0[01],
78 	 * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
79 #define	UF_ESPINUDP		0x00000002	/* w/ non-ESP marker. */
80 
81 struct udpstat {
82 				/* input statistics: */
83 	uint64_t udps_ipackets;		/* total input packets */
84 	uint64_t udps_hdrops;		/* packet shorter than header */
85 	uint64_t udps_badsum;		/* checksum error */
86 	uint64_t udps_nosum;		/* no checksum */
87 	uint64_t udps_badlen;		/* data length larger than packet */
88 	uint64_t udps_noport;		/* no socket on port */
89 	uint64_t udps_noportbcast;	/* of above, arrived as broadcast */
90 	uint64_t udps_fullsock;		/* not delivered, input socket full */
91 	uint64_t udpps_pcbcachemiss;	/* input packets missing pcb cache */
92 	uint64_t udpps_pcbhashmiss;	/* input packets not for hashed pcb */
93 				/* output statistics: */
94 	uint64_t udps_opackets;		/* total output packets */
95 	uint64_t udps_fastout;		/* output packets on fast path */
96 	/* of no socket on port, arrived as multicast */
97 	uint64_t udps_noportmcast;
98 	uint64_t udps_filtermcast;	/* blocked by multicast filter */
99 };
100 
101 #ifdef _KERNEL
102 #include <sys/counter.h>
103 
104 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
105 /*
106  * In-kernel consumers can use these accessor macros directly to update
107  * stats.
108  */
109 #define	UDPSTAT_ADD(name, val)  \
110     VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
111 #define	UDPSTAT_INC(name)	UDPSTAT_ADD(name, 1)
112 
113 /*
114  * Kernel module consumers must use this accessor macro.
115  */
116 void	kmod_udpstat_inc(int statnum);
117 #define	KMOD_UDPSTAT_INC(name)	\
118     kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
119 #endif
120 
121 /*
122  * Identifiers for UDP sysctl nodes.
123  */
124 #define	UDPCTL_CHECKSUM		1	/* checksum UDP packets */
125 #define	UDPCTL_STATS		2	/* statistics (read-only) */
126 #define	UDPCTL_MAXDGRAM		3	/* max datagram size */
127 #define	UDPCTL_RECVSPACE	4	/* default receive buffer space */
128 #define	UDPCTL_PCBLIST		5	/* list of PCBs for UDP sockets */
129 
130 #ifdef _KERNEL
131 #include <netinet/in_pcb.h>
132 SYSCTL_DECL(_net_inet_udp);
133 
134 extern struct pr_usrreqs	udp_usrreqs;
135 VNET_DECLARE(struct inpcbhead, udb);
136 VNET_DECLARE(struct inpcbinfo, udbinfo);
137 VNET_DECLARE(struct inpcbhead, ulitecb);
138 VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
139 #define	V_udb			VNET(udb)
140 #define	V_udbinfo		VNET(udbinfo)
141 #define	V_ulitecb		VNET(ulitecb)
142 #define	V_ulitecbinfo		VNET(ulitecbinfo)
143 
144 extern u_long			udp_sendspace;
145 extern u_long			udp_recvspace;
146 VNET_DECLARE(int, udp_cksum);
147 VNET_DECLARE(int, udp_blackhole);
148 #define	V_udp_cksum		VNET(udp_cksum)
149 #define	V_udp_blackhole		VNET(udp_blackhole)
150 extern int			udp_log_in_vain;
151 
152 static __inline struct inpcbinfo *
udp_get_inpcbinfo(int protocol)153 udp_get_inpcbinfo(int protocol)
154 {
155 	return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
156 }
157 
158 static __inline struct inpcbhead *
udp_get_pcblist(int protocol)159 udp_get_pcblist(int protocol)
160 {
161 	return (protocol == IPPROTO_UDP) ? &V_udb : &V_ulitecb;
162 }
163 
164 int		udp_newudpcb(struct inpcb *);
165 void		udp_discardcb(struct udpcb *);
166 
167 void		udp_ctlinput(int, struct sockaddr *, void *);
168 void		udplite_ctlinput(int, struct sockaddr *, void *);
169 int		udp_ctloutput(struct socket *, struct sockopt *);
170 void		udp_init(void);
171 void		udplite_init(void);
172 #ifdef VIMAGE
173 void		udp_destroy(void);
174 void		udplite_destroy(void);
175 #endif
176 int		udp_input(struct mbuf **, int *, int);
177 void		udplite_input(struct mbuf *, int);
178 struct inpcb	*udp_notify(struct inpcb *inp, int errno);
179 int		udp_shutdown(struct socket *so);
180 
181 int		udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
182 					 void *ctx);
183 
184 #endif /* _KERNEL */
185 
186 #endif /* _NETINET_UDP_VAR_H_ */
187