usr/src/boot/include/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
  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  * This structure is lazy-allocated.
  85  */
  86 struct ip_moptions {
  87         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
  88         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
  89         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
  90         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
  91         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
  92         u_short imo_num_memberships;    /* no. memberships this socket */
  93         u_short imo_max_memberships;    /* max memberships this socket */
  94         struct  in_multi **imo_membership;      /* group memberships */
  95         struct  in_mfilter *imo_mfilters;       /* source filters */
  96         STAILQ_ENTRY(ip_moptions) imo_link;
  97 };
  98
  99 struct  ipstat {
 100         uint64_t ips_total;             /* total packets received */
 101         uint64_t ips_badsum;            /* checksum bad */
 102         uint64_t ips_tooshort;          /* packet too short */
 103         uint64_t ips_toosmall;          /* not enough data */
 104         uint64_t ips_badhlen;           /* ip header length < data size */
 105         uint64_t ips_badlen;            /* ip length < ip header length */
 106         uint64_t ips_fragments;         /* fragments received */
 107         uint64_t ips_fragdropped;       /* frags dropped (dups, out of space) */
 108         uint64_t ips_fragtimeout;       /* fragments timed out */
 109         uint64_t ips_forward;           /* packets forwarded */
 110         uint64_t ips_fastforward;       /* packets fast forwarded */
 111         uint64_t ips_cantforward;       /* packets rcvd for unreachable dest */
 112         uint64_t ips_redirectsent;      /* packets forwarded on same net */
 113         uint64_t ips_noproto;           /* unknown or unsupported protocol */
 114         uint64_t ips_delivered;         /* datagrams delivered to upper level*/
 115         uint64_t ips_localout;          /* total ip packets generated here */
 116         uint64_t ips_odropped;          /* lost packets due to nobufs, etc. */
 117         uint64_t ips_reassembled;       /* total packets reassembled ok */
 118         uint64_t ips_fragmented;        /* datagrams successfully fragmented */
 119         uint64_t ips_ofragments;        /* output fragments created */
 120         uint64_t ips_cantfrag;          /* don't fragment flag was set, etc. */
 121         uint64_t ips_badoptions;                /* error in option processing */
 122         uint64_t ips_noroute;           /* packets discarded due to no route */
 123         uint64_t ips_badvers;           /* ip version != 4 */
 124         uint64_t ips_rawout;            /* total raw ip packets generated */
 125         uint64_t ips_toolong;           /* ip length > max ip packet size */
 126         uint64_t ips_notmember;         /* multicasts for unregistered grps */
 127         uint64_t ips_nogif;             /* no match gif found */
 128         uint64_t ips_badaddr;           /* invalid address on header */
 129 };
 130
 131 #ifdef _KERNEL
 132
 133 #include <sys/counter.h>
 134 #include <net/vnet.h>
 135
 136 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat);
 137 /*
 138  * In-kernel consumers can use these accessor macros directly to update
 139  * stats.
 140  */
 141 #define IPSTAT_ADD(name, val)   \
 142     VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val))
 143 #define IPSTAT_SUB(name, val)   IPSTAT_ADD(name, -(val))
 144 #define IPSTAT_INC(name)        IPSTAT_ADD(name, 1)
 145 #define IPSTAT_DEC(name)        IPSTAT_SUB(name, 1)
 146
 147 /*
 148  * Kernel module consumers must use this accessor macro.
 149  */
 150 void    kmod_ipstat_inc(int statnum);
 151 #define KMOD_IPSTAT_INC(name)   \
 152     kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(uint64_t))
 153 void    kmod_ipstat_dec(int statnum);
 154 #define KMOD_IPSTAT_DEC(name)   \
 155     kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(uint64_t))
 156
 157 /* flags passed to ip_output as last parameter */
 158 #define IP_FORWARDING           0x1             /* most of ip header exists */
 159 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
 160 #define IP_SENDONES             0x4             /* send all-ones broadcast */
 161 #define IP_SENDTOIF             0x8             /* send on specific ifnet */
 162 #define IP_ROUTETOIF            SO_DONTROUTE    /* 0x10 bypass routing tables */
 163 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* 0x20 can send broadcast packets */
 164 #define IP_NODEFAULTFLOWID      0x40            /* Don't set the flowid from inp */
 165
 166 #ifdef __NO_STRICT_ALIGNMENT
 167 #define IP_HDR_ALIGNED_P(ip)    1
 168 #else
 169 #define IP_HDR_ALIGNED_P(ip)    ((((intptr_t) (ip)) & 3) == 0)
 170 #endif
 171
 172 struct ip;
 173 struct inpcb;
 174 struct route;
 175 struct sockopt;
 176
 177 VNET_DECLARE(int, ip_defttl);                   /* default IP ttl */
 178 VNET_DECLARE(int, ipforwarding);                /* ip forwarding */
 179 #ifdef IPSTEALTH
 180 VNET_DECLARE(int, ipstealth);                   /* stealth forwarding */
 181 #endif
 182 extern u_char   ip_protox[];
 183 VNET_DECLARE(struct socket *, ip_rsvpd);        /* reservation protocol daemon*/
 184 VNET_DECLARE(struct socket *, ip_mrouter);      /* multicast routing daemon */
 185 extern int      (*legal_vif_num)(int);
 186 extern u_long   (*ip_mcast_src)(int);
 187 VNET_DECLARE(int, rsvp_on);
 188 VNET_DECLARE(int, drop_redirect);
 189 extern struct   pr_usrreqs rip_usrreqs;
 190
 191 #define V_ip_id                 VNET(ip_id)
 192 #define V_ip_defttl             VNET(ip_defttl)
 193 #define V_ipforwarding          VNET(ipforwarding)
 194 #ifdef IPSTEALTH
 195 #define V_ipstealth             VNET(ipstealth)
 196 #endif
 197 #define V_ip_rsvpd              VNET(ip_rsvpd)
 198 #define V_ip_mrouter            VNET(ip_mrouter)
 199 #define V_rsvp_on               VNET(rsvp_on)
 200 #define V_drop_redirect         VNET(drop_redirect)
 201
 202 void    inp_freemoptions(struct ip_moptions *);
 203 int     inp_getmoptions(struct inpcb *, struct sockopt *);
 204 int     inp_setmoptions(struct inpcb *, struct sockopt *);
 205
 206 int     ip_ctloutput(struct socket *, struct sockopt *sopt);
 207 void    ip_drain(void);
 208 int     ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 209             u_long if_hwassist_flags);
 210 void    ip_forward(struct mbuf *m, int srcrt);
 211 void    ip_init(void);
 212 #ifdef VIMAGE
 213 void    ip_destroy(void);
 214 #endif
 215 extern int
 216         (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
 217             struct ip_moptions *);
 218 int     ip_output(struct mbuf *,
 219             struct mbuf *, struct route *, int, struct ip_moptions *,
 220             struct inpcb *);
 221 int     ipproto_register(short);
 222 int     ipproto_unregister(short);
 223 struct mbuf *
 224         ip_reass(struct mbuf *);
 225 struct in_ifaddr *
 226         ip_rtaddr(struct in_addr, u_int fibnum);
 227 void    ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
 228             struct mbuf *);
 229 void    ip_slowtimo(void);
 230 void    ip_fillid(struct ip *);
 231 int     rip_ctloutput(struct socket *, struct sockopt *);
 232 void    rip_ctlinput(int, struct sockaddr *, void *);
 233 void    rip_init(void);
 234 #ifdef VIMAGE
 235 void    rip_destroy(void);
 236 #endif
 237 int     rip_input(struct mbuf **, int *, int);
 238 int     rip_output(struct mbuf *, struct socket *, ...);
 239 int     ipip_input(struct mbuf **, int *, int);
 240 int     rsvp_input(struct mbuf **, int *, int);
 241 int     ip_rsvp_init(struct socket *);
 242 int     ip_rsvp_done(void);
 243 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
 244 extern void     (*ip_rsvp_force_done)(struct socket *);
 245 extern int      (*rsvp_input_p)(struct mbuf **, int *, int);
 246
 247 VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */
 248 #define V_inet_pfil_hook        VNET(inet_pfil_hook)
 249
 250 void    in_delayed_cksum(struct mbuf *m);
 251
 252 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
 253 /*
 254  * Reference to an ipfw or packet filter rule that can be carried
 255  * outside critical sections.
 256  * A rule is identified by rulenum:rule_id which is ordered.
 257  * In version chain_id the rule can be found in slot 'slot', so
 258  * we don't need a lookup if chain_id == chain->id.
 259  *
 260  * On exit from the firewall this structure refers to the rule after
 261  * the matching one (slot points to the new rule; rulenum:rule_id-1
 262  * is the matching rule), and additional info (e.g. info often contains
 263  * the insn argument or tablearg in the low 16 bits, in host format).
 264  * On entry, the structure is valid if slot>0, and refers to the starting
 265  * rules. 'info' contains the reason for reinject, e.g. divert port,
 266  * divert direction, and so on.
 267  */
 268 struct ipfw_rule_ref {
 269         uint32_t        slot;           /* slot for matching rule       */
 270         uint32_t        rulenum;        /* matching rule number         */
 271         uint32_t        rule_id;        /* matching rule id             */
 272         uint32_t        chain_id;       /* ruleset id                   */
 273         uint32_t        info;           /* see below                    */
 274 };
 275
 276 enum {
 277         IPFW_INFO_MASK  = 0x0000ffff,
 278         IPFW_INFO_OUT   = 0x00000000,   /* outgoing, just for convenience */
 279         IPFW_INFO_IN    = 0x80000000,   /* incoming, overloads dir */
 280         IPFW_ONEPASS    = 0x40000000,   /* One-pass, do not reinject */
 281         IPFW_IS_MASK    = 0x30000000,   /* which source ? */
 282         IPFW_IS_DIVERT  = 0x20000000,
 283         IPFW_IS_DUMMYNET =0x10000000,
 284         IPFW_IS_PIPE    = 0x08000000,   /* pipe=1, queue = 0 */
 285 };
 286 #define MTAG_IPFW       1148380143      /* IPFW-tagged cookie */
 287 #define MTAG_IPFW_RULE  1262273568      /* rule reference */
 288 #define MTAG_IPFW_CALL  1308397630      /* call stack */
 289
 290 struct ip_fw_args;
 291 typedef int     (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
 292 typedef int     (*ip_fw_ctl_ptr_t)(struct sockopt *);
 293 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
 294 #define V_ip_fw_ctl_ptr         VNET(ip_fw_ctl_ptr)
 295
 296 /* Divert hooks. */
 297 extern void     (*ip_divert_ptr)(struct mbuf *m, int incoming);
 298 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
 299 extern int      (*ng_ipfw_input_p)(struct mbuf **, int,
 300                         struct ip_fw_args *, int);
 301
 302 extern int      (*ip_dn_ctl_ptr)(struct sockopt *);
 303 extern int      (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
 304 #endif /* _KERNEL */
 305
 306 #endif /* !_NETINET_IP_VAR_H_ */