xref: /freebsd/sys/netinet/ip_var.h (revision 78007886c995898a9494648343e5236bca1cbba3)
1 /*-
2  * Copyright (c) 1982, 1986, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *	@(#)ip_var.h	8.2 (Berkeley) 1/9/95
30  * $FreeBSD$
31  */
32 
33 #ifndef _NETINET_IP_VAR_H_
34 #define	_NETINET_IP_VAR_H_
35 
36 #include <sys/queue.h>
37 
38 /*
39  * Overlay for ip header used by other protocols (tcp, udp).
40  */
41 struct ipovly {
42 	u_char	ih_x1[9];		/* (unused) */
43 	u_char	ih_pr;			/* protocol */
44 	u_short	ih_len;			/* protocol length */
45 	struct	in_addr ih_src;		/* source internet address */
46 	struct	in_addr ih_dst;		/* destination internet address */
47 };
48 
49 #ifdef _KERNEL
50 /*
51  * Ip reassembly queue structure.  Each fragment
52  * being reassembled is attached to one of these structures.
53  * They are timed out after ipq_ttl drops to 0, and may also
54  * be reclaimed if memory becomes tight.
55  */
56 struct ipq {
57 	TAILQ_ENTRY(ipq) ipq_list;	/* to other reass headers */
58 	u_char	ipq_ttl;		/* time for reass q to live */
59 	u_char	ipq_p;			/* protocol of this fragment */
60 	u_short	ipq_id;			/* sequence id for reassembly */
61 	struct mbuf *ipq_frags;		/* to ip headers of fragments */
62 	struct	in_addr ipq_src,ipq_dst;
63 	u_char	ipq_nfrags;		/* # frags in this packet */
64 	struct label *ipq_label;	/* MAC label */
65 };
66 #endif /* _KERNEL */
67 
68 /*
69  * Structure stored in mbuf in inpcb.ip_options
70  * and passed to ip_output when ip options are in use.
71  * The actual length of the options (including ipopt_dst)
72  * is in m_len.
73  */
74 #define MAX_IPOPTLEN	40
75 
76 struct ipoption {
77 	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
78 	char	ipopt_list[MAX_IPOPTLEN];	/* options proper */
79 };
80 
81 /*
82  * Structure attached to inpcb.ip_moptions and
83  * passed to ip_output when IP multicast options are in use.
84  */
85 struct ip_moptions {
86 	struct	ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
87 	struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
88 	u_long	imo_multicast_vif;	/* vif num outgoing multicasts */
89 	u_char	imo_multicast_ttl;	/* TTL for outgoing multicasts */
90 	u_char	imo_multicast_loop;	/* 1 => hear sends if a member */
91 	u_short	imo_num_memberships;	/* no. memberships this socket */
92 	u_short	imo_max_memberships;	/* max memberships this socket */
93 	struct	in_multi **imo_membership;	/* group memberships */
94 };
95 
96 struct	ipstat {
97 	u_long	ips_total;		/* total packets received */
98 	u_long	ips_badsum;		/* checksum bad */
99 	u_long	ips_tooshort;		/* packet too short */
100 	u_long	ips_toosmall;		/* not enough data */
101 	u_long	ips_badhlen;		/* ip header length < data size */
102 	u_long	ips_badlen;		/* ip length < ip header length */
103 	u_long	ips_fragments;		/* fragments received */
104 	u_long	ips_fragdropped;	/* frags dropped (dups, out of space) */
105 	u_long	ips_fragtimeout;	/* fragments timed out */
106 	u_long	ips_forward;		/* packets forwarded */
107 	u_long	ips_fastforward;	/* packets fast forwarded */
108 	u_long	ips_cantforward;	/* packets rcvd for unreachable dest */
109 	u_long	ips_redirectsent;	/* packets forwarded on same net */
110 	u_long	ips_noproto;		/* unknown or unsupported protocol */
111 	u_long	ips_delivered;		/* datagrams delivered to upper level*/
112 	u_long	ips_localout;		/* total ip packets generated here */
113 	u_long	ips_odropped;		/* lost packets due to nobufs, etc. */
114 	u_long	ips_reassembled;	/* total packets reassembled ok */
115 	u_long	ips_fragmented;		/* datagrams successfully fragmented */
116 	u_long	ips_ofragments;		/* output fragments created */
117 	u_long	ips_cantfrag;		/* don't fragment flag was set, etc. */
118 	u_long	ips_badoptions;		/* error in option processing */
119 	u_long	ips_noroute;		/* packets discarded due to no route */
120 	u_long	ips_badvers;		/* ip version != 4 */
121 	u_long	ips_rawout;		/* total raw ip packets generated */
122 	u_long	ips_toolong;		/* ip length > max ip packet size */
123 	u_long	ips_notmember;		/* multicasts for unregistered grps */
124 	u_long	ips_nogif;		/* no match gif found */
125 	u_long	ips_badaddr;		/* invalid address on header */
126 };
127 
128 #ifdef _KERNEL
129 
130 /*
131  * Flags passed to ip_output as last parameter.
132  */
133 #define IP_FORWARDING		0x01		/* most of ip header exists */
134 #define IP_RAWOUTPUT		0x02		/* raw ip header exists */
135 #define IP_SENDONES		0x04		/* send all-ones broadcast */
136 #define IP_ROUTETOIF		SO_DONTROUTE	/* 0x10 bypass routing tables */
137 #define IP_ALLOWBROADCAST	SO_BROADCAST	/* 0x20 can send broadcast packets */
138 
139 /*
140  * mbuf flag used by ip_fastfwd
141  */
142 #define	M_FASTFWD_OURS		M_PROTO1	/* changed dst to local */
143 
144 #ifdef __NO_STRICT_ALIGNMENT
145 #define IP_HDR_ALIGNED_P(ip)	1
146 #else
147 #define IP_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
148 #endif
149 
150 struct ip;
151 struct inpcb;
152 struct route;
153 struct sockopt;
154 
155 extern struct	ipstat	ipstat;
156 extern u_short	ip_id;			/* ip packet ctr, for ids */
157 extern int	ip_defttl;		/* default IP ttl */
158 extern int	ipforwarding;		/* ip forwarding */
159 #ifdef IPSTEALTH
160 extern int	ipstealth;		/* stealth forwarding */
161 #endif
162 extern u_char	ip_protox[];
163 extern struct socket *ip_rsvpd;		/* reservation protocol daemon */
164 extern struct socket *ip_mrouter;	/* multicast routing daemon */
165 extern int	(*legal_vif_num)(int);
166 extern u_long	(*ip_mcast_src)(int);
167 extern int rsvp_on;
168 extern struct	pr_usrreqs rip_usrreqs;
169 
170 int	ip_ctloutput(struct socket *, struct sockopt *sopt);
171 void	ip_drain(void);
172 void	ip_fini(void *xtp);
173 int	ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
174 	    u_long if_hwassist_flags, int sw_csum);
175 void	ip_freemoptions(struct ip_moptions *);
176 void	ip_forward(struct mbuf *m, int srcrt);
177 void	ip_init(void);
178 extern int
179 	(*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
180 	    struct ip_moptions *);
181 int	ip_output(struct mbuf *,
182 	    struct mbuf *, struct route *, int, struct ip_moptions *,
183 	    struct inpcb *);
184 int	ipproto_register(u_char);
185 int	ipproto_unregister(u_char);
186 struct mbuf *
187 	ip_reass(struct mbuf *);
188 struct in_ifaddr *
189 	ip_rtaddr(struct in_addr);
190 void	ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
191 	    struct mbuf *);
192 void	ip_slowtimo(void);
193 u_int16_t	ip_randomid(void);
194 int	rip_ctloutput(struct socket *, struct sockopt *);
195 void	rip_ctlinput(int, struct sockaddr *, void *);
196 void	rip_init(void);
197 void	rip_input(struct mbuf *, int);
198 int	rip_output(struct mbuf *, struct socket *, u_long);
199 void	ipip_input(struct mbuf *, int);
200 void	rsvp_input(struct mbuf *, int);
201 int	ip_rsvp_init(struct socket *);
202 int	ip_rsvp_done(void);
203 extern int	(*ip_rsvp_vif)(struct socket *, struct sockopt *);
204 extern void	(*ip_rsvp_force_done)(struct socket *);
205 extern void	(*rsvp_input_p)(struct mbuf *m, int off);
206 
207 extern	struct pfil_head inet_pfil_hook;	/* packet filter hooks */
208 
209 void	in_delayed_cksum(struct mbuf *m);
210 
211 static __inline uint16_t ip_newid(void);
212 extern int ip_do_randomid;
213 
214 static __inline uint16_t
215 ip_newid(void)
216 {
217 	if (ip_do_randomid)
218 		return ip_randomid();
219 
220 	return htons(ip_id++);
221 }
222 
223 #endif /* _KERNEL */
224 
225 #endif /* !_NETINET_IP_VAR_H_ */
226