xref: /freebsd/sys/netinet/ip_var.h (revision eddfbb763ded6b5f6777335142be9a0edab628bb)
1c398230bSWarner Losh /*-
2df8bae1dSRodney W. Grimes  * Copyright (c) 1982, 1986, 1993
3df8bae1dSRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
4df8bae1dSRodney W. Grimes  *
5df8bae1dSRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
6df8bae1dSRodney W. Grimes  * modification, are permitted provided that the following conditions
7df8bae1dSRodney W. Grimes  * are met:
8df8bae1dSRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
9df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
10df8bae1dSRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
11df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
12df8bae1dSRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
13df8bae1dSRodney W. Grimes  * 4. Neither the name of the University nor the names of its contributors
14df8bae1dSRodney W. Grimes  *    may be used to endorse or promote products derived from this software
15df8bae1dSRodney W. Grimes  *    without specific prior written permission.
16df8bae1dSRodney W. Grimes  *
17df8bae1dSRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18df8bae1dSRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19df8bae1dSRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20df8bae1dSRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21df8bae1dSRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22df8bae1dSRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23df8bae1dSRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24df8bae1dSRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25df8bae1dSRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26df8bae1dSRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27df8bae1dSRodney W. Grimes  * SUCH DAMAGE.
28df8bae1dSRodney W. Grimes  *
293271ad14SGarrett Wollman  *	@(#)ip_var.h	8.2 (Berkeley) 1/9/95
30c3aac50fSPeter Wemm  * $FreeBSD$
31df8bae1dSRodney W. Grimes  */
32df8bae1dSRodney W. Grimes 
33707f139eSPaul Richards #ifndef _NETINET_IP_VAR_H_
34707f139eSPaul Richards #define	_NETINET_IP_VAR_H_
35707f139eSPaul Richards 
3633841545SHajimu UMEMOTO #include <sys/queue.h>
3733841545SHajimu UMEMOTO 
38df8bae1dSRodney W. Grimes /*
39df8bae1dSRodney W. Grimes  * Overlay for ip header used by other protocols (tcp, udp).
40df8bae1dSRodney W. Grimes  */
41df8bae1dSRodney W. Grimes struct ipovly {
426effc713SDoug Rabson 	u_char	ih_x1[9];		/* (unused) */
43df8bae1dSRodney W. Grimes 	u_char	ih_pr;			/* protocol */
44430d30d8SBill Fenner 	u_short	ih_len;			/* protocol length */
45df8bae1dSRodney W. Grimes 	struct	in_addr ih_src;		/* source internet address */
46df8bae1dSRodney W. Grimes 	struct	in_addr ih_dst;		/* destination internet address */
47df8bae1dSRodney W. Grimes };
48df8bae1dSRodney W. Grimes 
4969dac2eaSRobert Watson #ifdef _KERNEL
50df8bae1dSRodney W. Grimes /*
51df8bae1dSRodney W. Grimes  * Ip reassembly queue structure.  Each fragment
52df8bae1dSRodney W. Grimes  * being reassembled is attached to one of these structures.
53df8bae1dSRodney W. Grimes  * They are timed out after ipq_ttl drops to 0, and may also
54df8bae1dSRodney W. Grimes  * be reclaimed if memory becomes tight.
55df8bae1dSRodney W. Grimes  */
56df8bae1dSRodney W. Grimes struct ipq {
57462b86feSPoul-Henning Kamp 	TAILQ_ENTRY(ipq) ipq_list;	/* to other reass headers */
58df8bae1dSRodney W. Grimes 	u_char	ipq_ttl;		/* time for reass q to live */
59df8bae1dSRodney W. Grimes 	u_char	ipq_p;			/* protocol of this fragment */
60df8bae1dSRodney W. Grimes 	u_short	ipq_id;			/* sequence id for reassembly */
616effc713SDoug Rabson 	struct mbuf *ipq_frags;		/* to ip headers of fragments */
62df8bae1dSRodney W. Grimes 	struct	in_addr ipq_src,ipq_dst;
63375386e2SMike Silbersack 	u_char	ipq_nfrags;		/* # frags in this packet */
64eca8a663SRobert Watson 	struct label *ipq_label;	/* MAC label */
65df8bae1dSRodney W. Grimes };
6669dac2eaSRobert Watson #endif /* _KERNEL */
67df8bae1dSRodney W. Grimes 
68df8bae1dSRodney W. Grimes /*
69c444cddeSAndre Oppermann  * Structure stored in mbuf in inpcb.ip_options
70c444cddeSAndre Oppermann  * and passed to ip_output when ip options are in use.
71c444cddeSAndre Oppermann  * The actual length of the options (including ipopt_dst)
72c444cddeSAndre Oppermann  * is in m_len.
73c444cddeSAndre Oppermann  */
74c444cddeSAndre Oppermann #define MAX_IPOPTLEN	40
75c444cddeSAndre Oppermann 
76c444cddeSAndre Oppermann struct ipoption {
77c444cddeSAndre Oppermann 	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
78c444cddeSAndre Oppermann 	char	ipopt_list[MAX_IPOPTLEN];	/* options proper */
79c444cddeSAndre Oppermann };
80c444cddeSAndre Oppermann 
81c444cddeSAndre Oppermann /*
82df8bae1dSRodney W. Grimes  * Structure attached to inpcb.ip_moptions and
83df8bae1dSRodney W. Grimes  * passed to ip_output when IP multicast options are in use.
8471498f30SBruce M Simpson  * This structure is lazy-allocated.
85df8bae1dSRodney W. Grimes  */
86df8bae1dSRodney W. Grimes struct ip_moptions {
87df8bae1dSRodney W. Grimes 	struct	ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
8833841545SHajimu UMEMOTO 	struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
893548bfc9SBruce M Simpson 	u_long	imo_multicast_vif;	/* vif num outgoing multicasts */
90df8bae1dSRodney W. Grimes 	u_char	imo_multicast_ttl;	/* TTL for outgoing multicasts */
91df8bae1dSRodney W. Grimes 	u_char	imo_multicast_loop;	/* 1 => hear sends if a member */
92df8bae1dSRodney W. Grimes 	u_short	imo_num_memberships;	/* no. memberships this socket */
933548bfc9SBruce M Simpson 	u_short	imo_max_memberships;	/* max memberships this socket */
943548bfc9SBruce M Simpson 	struct	in_multi **imo_membership;	/* group memberships */
9571498f30SBruce M Simpson 	struct	in_mfilter *imo_mfilters;	/* source filters */
96df8bae1dSRodney W. Grimes };
97df8bae1dSRodney W. Grimes 
98df8bae1dSRodney W. Grimes struct	ipstat {
99df8bae1dSRodney W. Grimes 	u_long	ips_total;		/* total packets received */
100df8bae1dSRodney W. Grimes 	u_long	ips_badsum;		/* checksum bad */
101df8bae1dSRodney W. Grimes 	u_long	ips_tooshort;		/* packet too short */
102df8bae1dSRodney W. Grimes 	u_long	ips_toosmall;		/* not enough data */
103df8bae1dSRodney W. Grimes 	u_long	ips_badhlen;		/* ip header length < data size */
104df8bae1dSRodney W. Grimes 	u_long	ips_badlen;		/* ip length < ip header length */
105df8bae1dSRodney W. Grimes 	u_long	ips_fragments;		/* fragments received */
106df8bae1dSRodney W. Grimes 	u_long	ips_fragdropped;	/* frags dropped (dups, out of space) */
107df8bae1dSRodney W. Grimes 	u_long	ips_fragtimeout;	/* fragments timed out */
108df8bae1dSRodney W. Grimes 	u_long	ips_forward;		/* packets forwarded */
1091f91d8c5SDavid Greenman 	u_long	ips_fastforward;	/* packets fast forwarded */
110df8bae1dSRodney W. Grimes 	u_long	ips_cantforward;	/* packets rcvd for unreachable dest */
111df8bae1dSRodney W. Grimes 	u_long	ips_redirectsent;	/* packets forwarded on same net */
112df8bae1dSRodney W. Grimes 	u_long	ips_noproto;		/* unknown or unsupported protocol */
113df8bae1dSRodney W. Grimes 	u_long	ips_delivered;		/* datagrams delivered to upper level*/
114df8bae1dSRodney W. Grimes 	u_long	ips_localout;		/* total ip packets generated here */
115df8bae1dSRodney W. Grimes 	u_long	ips_odropped;		/* lost packets due to nobufs, etc. */
116df8bae1dSRodney W. Grimes 	u_long	ips_reassembled;	/* total packets reassembled ok */
1176c5e9bbdSMike Pritchard 	u_long	ips_fragmented;		/* datagrams successfully fragmented */
118df8bae1dSRodney W. Grimes 	u_long	ips_ofragments;		/* output fragments created */
119df8bae1dSRodney W. Grimes 	u_long	ips_cantfrag;		/* don't fragment flag was set, etc. */
120df8bae1dSRodney W. Grimes 	u_long	ips_badoptions;		/* error in option processing */
121df8bae1dSRodney W. Grimes 	u_long	ips_noroute;		/* packets discarded due to no route */
122df8bae1dSRodney W. Grimes 	u_long	ips_badvers;		/* ip version != 4 */
123df8bae1dSRodney W. Grimes 	u_long	ips_rawout;		/* total raw ip packets generated */
124430d30d8SBill Fenner 	u_long	ips_toolong;		/* ip length > max ip packet size */
12582c39223SGarrett Wollman 	u_long	ips_notmember;		/* multicasts for unregistered grps */
12676429de4SYoshinobu Inoue 	u_long	ips_nogif;		/* no match gif found */
12733841545SHajimu UMEMOTO 	u_long	ips_badaddr;		/* invalid address on header */
128df8bae1dSRodney W. Grimes };
129df8bae1dSRodney W. Grimes 
130664a31e4SPeter Wemm #ifdef _KERNEL
1315914e1eaSBruce Evans 
132eddfbb76SRobert Watson #include <net/vnet.h>
133eddfbb76SRobert Watson 
13486425c62SRobert Watson #define	IPSTAT_ADD(name, val)	V_ipstat.name += (val)
13586425c62SRobert Watson #define	IPSTAT_SUB(name, val)	V_ipstat.name -= (val)
13686425c62SRobert Watson #define	IPSTAT_INC(name)	IPSTAT_ADD(name, 1)
13786425c62SRobert Watson #define	IPSTAT_DEC(name)	IPSTAT_SUB(name, 1)
13886425c62SRobert Watson 
13971498f30SBruce M Simpson /* flags passed to ip_output as last parameter */
14071498f30SBruce M Simpson #define	IP_FORWARDING		0x1		/* most of ip header exists */
14171498f30SBruce M Simpson #define	IP_RAWOUTPUT		0x2		/* raw ip header exists */
14271498f30SBruce M Simpson #define	IP_SENDONES		0x4		/* send all-ones broadcast */
14371498f30SBruce M Simpson #define	IP_SENDTOIF		0x8		/* send on specific ifnet */
144beaa515eSAndre Oppermann #define IP_ROUTETOIF		SO_DONTROUTE	/* 0x10 bypass routing tables */
145beaa515eSAndre Oppermann #define IP_ALLOWBROADCAST	SO_BROADCAST	/* 0x20 can send broadcast packets */
146df8bae1dSRodney W. Grimes 
147beaa515eSAndre Oppermann /*
148beaa515eSAndre Oppermann  * mbuf flag used by ip_fastfwd
149beaa515eSAndre Oppermann  */
150ac9d7e26SMax Laier #define	M_FASTFWD_OURS		M_PROTO1	/* changed dst to local */
151ac9d7e26SMax Laier 
1522fcb030aSAndrew Thompson #ifdef __NO_STRICT_ALIGNMENT
1532fcb030aSAndrew Thompson #define IP_HDR_ALIGNED_P(ip)	1
1542fcb030aSAndrew Thompson #else
1552fcb030aSAndrew Thompson #define IP_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
1562fcb030aSAndrew Thompson #endif
1572fcb030aSAndrew Thompson 
158cfe8b629SGarrett Wollman struct ip;
159ca5d5e73SBruce Evans struct inpcb;
1605e26bd9aSBruce Evans struct route;
161cfe8b629SGarrett Wollman struct sockopt;
1625e26bd9aSBruce Evans 
163eddfbb76SRobert Watson VNET_DECLARE(struct ipstat, ipstat);
164eddfbb76SRobert Watson VNET_DECLARE(u_short, ip_id);			/* ip packet ctr, for ids */
165eddfbb76SRobert Watson VNET_DECLARE(int, ip_defttl);			/* default IP ttl */
166eddfbb76SRobert Watson VNET_DECLARE(int, ipforwarding);		/* ip forwarding */
167c76ff708SAndre Oppermann #ifdef IPSTEALTH
168eddfbb76SRobert Watson VNET_DECLARE(int, ipstealth);			/* stealth forwarding */
169c76ff708SAndre Oppermann #endif
170eddfbb76SRobert Watson VNET_DECLARE(int, rsvp_on);
171eddfbb76SRobert Watson VNET_DECLARE(struct socket *, ip_rsvpd);	/* reservation protocol daemon*/
172eddfbb76SRobert Watson VNET_DECLARE(struct socket *, ip_mrouter);	/* multicast routing daemon */
173eddfbb76SRobert Watson 
174eddfbb76SRobert Watson #define	V_ipstat		VNET_GET(ipstat)
175eddfbb76SRobert Watson #define	V_ip_id			VNET_GET(ip_id)
176eddfbb76SRobert Watson #define	V_ip_defttl		VNET_GET(ip_defttl)
177eddfbb76SRobert Watson #define	V_ipforwarding		VNET_GET(ipforwarding)
178eddfbb76SRobert Watson #ifdef IPSTEALTH
179eddfbb76SRobert Watson #define	V_ipstealth		VNET_GET(ipstealth)
180eddfbb76SRobert Watson #endif
181eddfbb76SRobert Watson #define	V_rsvp_on		VNET_GET(rsvp_on)
182eddfbb76SRobert Watson #define	V_ip_rsvpd		VNET_GET(ip_rsvpd)
183eddfbb76SRobert Watson #define	V_ip_mrouter		VNET_GET(ip_mrouter)
184115a40c7SLuigi Rizzo 
18586413abfSBjoern A. Zeeb extern u_char	ip_protox[];
1864d77a549SAlfred Perlstein extern int	(*legal_vif_num)(int);
1874d77a549SAlfred Perlstein extern u_long	(*ip_mcast_src)(int);
188117bcae7SGarrett Wollman extern struct	pr_usrreqs rip_usrreqs;
189df8bae1dSRodney W. Grimes 
19071498f30SBruce M Simpson void	inp_freemoptions(struct ip_moptions *);
19171498f30SBruce M Simpson int	inp_getmoptions(struct inpcb *, struct sockopt *);
19271498f30SBruce M Simpson int	inp_setmoptions(struct inpcb *, struct sockopt *);
19371498f30SBruce M Simpson 
1944d77a549SAlfred Perlstein int	ip_ctloutput(struct socket *, struct sockopt *sopt);
1954d77a549SAlfred Perlstein void	ip_drain(void);
1965f311da2SMike Silbersack void	ip_fini(void *xtp);
1971e78ac21SJeffrey Hsu int	ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
1981e78ac21SJeffrey Hsu 	    u_long if_hwassist_flags, int sw_csum);
199ef39adf0SAndre Oppermann void	ip_forward(struct mbuf *m, int srcrt);
2004d77a549SAlfred Perlstein void	ip_init(void);
201beaa515eSAndre Oppermann extern int
202beaa515eSAndre Oppermann 	(*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
2034d77a549SAlfred Perlstein 	    struct ip_moptions *);
2044d77a549SAlfred Perlstein int	ip_output(struct mbuf *,
2055d846453SSam Leffler 	    struct mbuf *, struct route *, int, struct ip_moptions *,
2065d846453SSam Leffler 	    struct inpcb *);
207de38924dSAndre Oppermann int	ipproto_register(u_char);
208de38924dSAndre Oppermann int	ipproto_unregister(u_char);
2099b932e9eSAndre Oppermann struct mbuf *
2109b932e9eSAndre Oppermann 	ip_reass(struct mbuf *);
211bd714208SRuslan Ermilov struct in_ifaddr *
2128b07e49aSJulian Elischer 	ip_rtaddr(struct in_addr, u_int fibnum);
2134d77a549SAlfred Perlstein void	ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
2144d77a549SAlfred Perlstein 	    struct mbuf *);
2154d77a549SAlfred Perlstein void	ip_slowtimo(void);
2161f44b0a1SDavid Malone u_int16_t	ip_randomid(void);
2174d77a549SAlfred Perlstein int	rip_ctloutput(struct socket *, struct sockopt *);
2184d77a549SAlfred Perlstein void	rip_ctlinput(int, struct sockaddr *, void *);
2194d77a549SAlfred Perlstein void	rip_init(void);
220bc29160dSMarko Zec #ifdef VIMAGE
221bc29160dSMarko Zec void	rip_destroy(void);
222bc29160dSMarko Zec #endif
2234d77a549SAlfred Perlstein void	rip_input(struct mbuf *, int);
2244d77a549SAlfred Perlstein int	rip_output(struct mbuf *, struct socket *, u_long);
2254d77a549SAlfred Perlstein void	ipip_input(struct mbuf *, int);
2264d77a549SAlfred Perlstein void	rsvp_input(struct mbuf *, int);
2274d77a549SAlfred Perlstein int	ip_rsvp_init(struct socket *);
2284d77a549SAlfred Perlstein int	ip_rsvp_done(void);
229bbb4330bSLuigi Rizzo extern int	(*ip_rsvp_vif)(struct socket *, struct sockopt *);
230bbb4330bSLuigi Rizzo extern void	(*ip_rsvp_force_done)(struct socket *);
231bbb4330bSLuigi Rizzo extern void	(*rsvp_input_p)(struct mbuf *m, int off);
232bbb4330bSLuigi Rizzo 
233c21fd232SAndre Oppermann extern	struct pfil_head inet_pfil_hook;	/* packet filter hooks */
234134ea224SSam Leffler 
2351c238475SJonathan Lemon void	in_delayed_cksum(struct mbuf *m);
2361c238475SJonathan Lemon 
237115a40c7SLuigi Rizzo /* ipfw and dummynet hooks. Most are declared in raw_ip.c */
238115a40c7SLuigi Rizzo struct ip_fw_args;
239115a40c7SLuigi Rizzo extern int	(*ip_fw_chk_ptr)(struct ip_fw_args *args);
240115a40c7SLuigi Rizzo extern int	(*ip_fw_ctl_ptr)(struct sockopt *);
241115a40c7SLuigi Rizzo extern int	(*ip_dn_ctl_ptr)(struct sockopt *);
242115a40c7SLuigi Rizzo extern int	(*ip_dn_io_ptr)(struct mbuf **m, int dir, struct ip_fw_args *fwa);
243115a40c7SLuigi Rizzo extern void	(*ip_dn_ruledel_ptr)(void *);		/* in ip_fw2.c */
244eddfbb76SRobert Watson 
245eddfbb76SRobert Watson VNET_DECLARE(int, ip_do_randomid);
246eddfbb76SRobert Watson #define	V_ip_do_randomid	VNET_GET(ip_do_randomid)
247eddfbb76SRobert Watson #define	ip_newid()	((V_ip_do_randomid != 0) ? ip_randomid() : \
248eddfbb76SRobert Watson 			    htons(V_ip_id++))
249eddfbb76SRobert Watson 
250664a31e4SPeter Wemm #endif /* _KERNEL */
251707f139eSPaul Richards 
2525914e1eaSBruce Evans #endif /* !_NETINET_IP_VAR_H_ */
253