sys/netinet/ip_var.h

   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 #ifdef _KERNEL
  38 #include <sys/vimage.h>
  39 #endif
  40
  41 /*
  42  * Overlay for ip header used by other protocols (tcp, udp).
  43  */
  44 struct ipovly {
  45         u_char  ih_x1[9];               /* (unused) */
  46         u_char  ih_pr;                  /* protocol */
  47         u_short ih_len;                 /* protocol length */
  48         struct  in_addr ih_src;         /* source internet address */
  49         struct  in_addr ih_dst;         /* destination internet address */
  50 };
  51
  52 #ifdef _KERNEL
  53 /*
  54  * Ip reassembly queue structure.  Each fragment
  55  * being reassembled is attached to one of these structures.
  56  * They are timed out after ipq_ttl drops to 0, and may also
  57  * be reclaimed if memory becomes tight.
  58  */
  59 struct ipq {
  60         TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
  61         u_char  ipq_ttl;                /* time for reass q to live */
  62         u_char  ipq_p;                  /* protocol of this fragment */
  63         u_short ipq_id;                 /* sequence id for reassembly */
  64         struct mbuf *ipq_frags;         /* to ip headers of fragments */
  65         struct  in_addr ipq_src,ipq_dst;
  66         u_char  ipq_nfrags;             /* # frags in this packet */
  67         struct label *ipq_label;        /* MAC label */
  68 };
  69 #endif /* _KERNEL */
  70
  71 /*
  72  * Structure stored in mbuf in inpcb.ip_options
  73  * and passed to ip_output when ip options are in use.
  74  * The actual length of the options (including ipopt_dst)
  75  * is in m_len.
  76  */
  77 #define MAX_IPOPTLEN    40
  78
  79 struct ipoption {
  80         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
  81         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
  82 };
  83
  84 /*
  85  * Multicast source list entry.
  86  */
  87 struct in_msource {
  88         TAILQ_ENTRY(in_msource) ims_next;       /* next source */
  89         struct sockaddr_storage ims_addr;       /* address of this source */
  90 };
  91
  92 /*
  93  * Multicast filter descriptor; there is one instance per group membership
  94  * on a socket, allocated as an expandable vector hung off ip_moptions.
  95  * struct in_multi contains separate IPv4-stack-wide state for IGMPv3.
  96  */
  97 struct in_mfilter {
  98         uint16_t        imf_fmode;      /* filter mode for this socket/group */
  99         uint16_t        imf_nsources;   /* # of sources for this socket/group */
 100         TAILQ_HEAD(, in_msource) imf_sources;   /* source list */
 101 };
 102
 103 /*
 104  * Structure attached to inpcb.ip_moptions and
 105  * passed to ip_output when IP multicast options are in use.
 106  * This structure is lazy-allocated.
 107  */
 108 struct ip_moptions {
 109         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
 110         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
 111         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
 112         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
 113         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
 114         u_short imo_num_memberships;    /* no. memberships this socket */
 115         u_short imo_max_memberships;    /* max memberships this socket */
 116         struct  in_multi **imo_membership;      /* group memberships */
 117         struct  in_mfilter *imo_mfilters;       /* source filters */
 118 };
 119
 120 struct  ipstat {
 121         u_long  ips_total;              /* total packets received */
 122         u_long  ips_badsum;             /* checksum bad */
 123         u_long  ips_tooshort;           /* packet too short */
 124         u_long  ips_toosmall;           /* not enough data */
 125         u_long  ips_badhlen;            /* ip header length < data size */
 126         u_long  ips_badlen;             /* ip length < ip header length */
 127         u_long  ips_fragments;          /* fragments received */
 128         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
 129         u_long  ips_fragtimeout;        /* fragments timed out */
 130         u_long  ips_forward;            /* packets forwarded */
 131         u_long  ips_fastforward;        /* packets fast forwarded */
 132         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
 133         u_long  ips_redirectsent;       /* packets forwarded on same net */
 134         u_long  ips_noproto;            /* unknown or unsupported protocol */
 135         u_long  ips_delivered;          /* datagrams delivered to upper level*/
 136         u_long  ips_localout;           /* total ip packets generated here */
 137         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
 138         u_long  ips_reassembled;        /* total packets reassembled ok */
 139         u_long  ips_fragmented;         /* datagrams successfully fragmented */
 140         u_long  ips_ofragments;         /* output fragments created */
 141         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
 142         u_long  ips_badoptions;         /* error in option processing */
 143         u_long  ips_noroute;            /* packets discarded due to no route */
 144         u_long  ips_badvers;            /* ip version != 4 */
 145         u_long  ips_rawout;             /* total raw ip packets generated */
 146         u_long  ips_toolong;            /* ip length > max ip packet size */
 147         u_long  ips_notmember;          /* multicasts for unregistered grps */
 148         u_long  ips_nogif;              /* no match gif found */
 149         u_long  ips_badaddr;            /* invalid address on header */
 150 };
 151
 152 #ifdef _KERNEL
 153
 154 /* flags passed to ip_output as last parameter */
 155 #define IP_FORWARDING           0x1             /* most of ip header exists */
 156 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
 157 #define IP_SENDONES             0x4             /* send all-ones broadcast */
 158 #define IP_SENDTOIF             0x8             /* send on specific ifnet */
 159 #define IP_ROUTETOIF            SO_DONTROUTE    /* 0x10 bypass routing tables */
 160 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* 0x20 can send broadcast packets */
 161
 162 /*
 163  * mbuf flag used by ip_fastfwd
 164  */
 165 #define M_FASTFWD_OURS          M_PROTO1        /* changed dst to local */
 166
 167 #ifdef __NO_STRICT_ALIGNMENT
 168 #define IP_HDR_ALIGNED_P(ip)    1
 169 #else
 170 #define IP_HDR_ALIGNED_P(ip)    ((((intptr_t) (ip)) & 3) == 0)
 171 #endif
 172
 173 struct ip;
 174 struct inpcb;
 175 struct route;
 176 struct sockopt;
 177
 178 extern struct   ipstat  ipstat;
 179 extern u_short  ip_id;                  /* ip packet ctr, for ids */
 180 extern int      ip_defttl;              /* default IP ttl */
 181 extern int      ipforwarding;           /* ip forwarding */
 182 #ifdef IPSTEALTH
 183 extern int      ipstealth;              /* stealth forwarding */
 184 #endif
 185 extern u_char   ip_protox[];
 186 extern struct socket *ip_rsvpd;         /* reservation protocol daemon */
 187 extern struct socket *ip_mrouter;       /* multicast routing daemon */
 188 extern int      (*legal_vif_num)(int);
 189 extern u_long   (*ip_mcast_src)(int);
 190 extern int rsvp_on;
 191 extern struct   pr_usrreqs rip_usrreqs;
 192
 193 void    inp_freemoptions(struct ip_moptions *);
 194 int     inp_getmoptions(struct inpcb *, struct sockopt *);
 195 int     inp_setmoptions(struct inpcb *, struct sockopt *);
 196
 197 int     ip_ctloutput(struct socket *, struct sockopt *sopt);
 198 void    ip_drain(void);
 199 void    ip_fini(void *xtp);
 200 int     ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 201             u_long if_hwassist_flags, int sw_csum);
 202 void    ip_forward(struct mbuf *m, int srcrt);
 203 void    ip_init(void);
 204 extern int
 205         (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
 206             struct ip_moptions *);
 207 int     ip_output(struct mbuf *,
 208             struct mbuf *, struct route *, int, struct ip_moptions *,
 209             struct inpcb *);
 210 int     ipproto_register(u_char);
 211 int     ipproto_unregister(u_char);
 212 struct mbuf *
 213         ip_reass(struct mbuf *);
 214 struct in_ifaddr *
 215         ip_rtaddr(struct in_addr, u_int fibnum);
 216 void    ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
 217             struct mbuf *);
 218 void    ip_slowtimo(void);
 219 u_int16_t       ip_randomid(void);
 220 int     rip_ctloutput(struct socket *, struct sockopt *);
 221 void    rip_ctlinput(int, struct sockaddr *, void *);
 222 void    rip_init(void);
 223 void    rip_input(struct mbuf *, int);
 224 int     rip_output(struct mbuf *, struct socket *, u_long);
 225 void    ipip_input(struct mbuf *, int);
 226 void    rsvp_input(struct mbuf *, int);
 227 int     ip_rsvp_init(struct socket *);
 228 int     ip_rsvp_done(void);
 229 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
 230 extern void     (*ip_rsvp_force_done)(struct socket *);
 231 extern void     (*rsvp_input_p)(struct mbuf *m, int off);
 232
 233 extern  struct pfil_head inet_pfil_hook;        /* packet filter hooks */
 234
 235 void    in_delayed_cksum(struct mbuf *m);
 236
 237 static __inline uint16_t ip_newid(void);
 238 extern int ip_do_randomid;
 239
 240 static __inline uint16_t
 241 ip_newid(void)
 242 {
 243         if (V_ip_do_randomid)
 244                 return ip_randomid();
 245
 246         return htons(V_ip_id++);
 247 }
 248
 249 #endif /* _KERNEL */
 250
 251 #endif /* !_NETINET_IP_VAR_H_ */