The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_var.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ip_var.h    8.2 (Berkeley) 1/9/95
   32  * $FreeBSD: releng/12.0/sys/netinet/ip_var.h 341262 2018-11-29 20:59:18Z markj $
   33  */
   34 
   35 #ifndef _NETINET_IP_VAR_H_
   36 #define _NETINET_IP_VAR_H_
   37 
   38 #include <sys/queue.h>
   39 #include <sys/epoch.h>
   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         int     ipq_maxoff;             /* total length of packet */
   65         struct mbuf *ipq_frags;         /* to ip headers of fragments */
   66         struct  in_addr ipq_src,ipq_dst;
   67         u_char  ipq_nfrags;             /* # frags in this packet */
   68         struct label *ipq_label;        /* MAC label */
   69 };
   70 #endif /* _KERNEL */
   71 
   72 /*
   73  * Structure stored in mbuf in inpcb.ip_options
   74  * and passed to ip_output when ip options are in use.
   75  * The actual length of the options (including ipopt_dst)
   76  * is in m_len.
   77  */
   78 #define MAX_IPOPTLEN    40
   79 
   80 struct ipoption {
   81         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
   82         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
   83 };
   84 
   85 /*
   86  * Structure attached to inpcb.ip_moptions and
   87  * passed to ip_output when IP multicast options are in use.
   88  * This structure is lazy-allocated.
   89  */
   90 struct ip_moptions {
   91         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
   92         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
   93         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
   94         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
   95         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
   96         u_short imo_num_memberships;    /* no. memberships this socket */
   97         u_short imo_max_memberships;    /* max memberships this socket */
   98         struct  in_multi **imo_membership;      /* group memberships */
   99         struct  in_mfilter *imo_mfilters;       /* source filters */
  100         struct  epoch_context imo_epoch_ctx;
  101 };
  102 
  103 struct  ipstat {
  104         uint64_t ips_total;             /* total packets received */
  105         uint64_t ips_badsum;            /* checksum bad */
  106         uint64_t ips_tooshort;          /* packet too short */
  107         uint64_t ips_toosmall;          /* not enough data */
  108         uint64_t ips_badhlen;           /* ip header length < data size */
  109         uint64_t ips_badlen;            /* ip length < ip header length */
  110         uint64_t ips_fragments;         /* fragments received */
  111         uint64_t ips_fragdropped;       /* frags dropped (dups, out of space) */
  112         uint64_t ips_fragtimeout;       /* fragments timed out */
  113         uint64_t ips_forward;           /* packets forwarded */
  114         uint64_t ips_fastforward;       /* packets fast forwarded */
  115         uint64_t ips_cantforward;       /* packets rcvd for unreachable dest */
  116         uint64_t ips_redirectsent;      /* packets forwarded on same net */
  117         uint64_t ips_noproto;           /* unknown or unsupported protocol */
  118         uint64_t ips_delivered;         /* datagrams delivered to upper level*/
  119         uint64_t ips_localout;          /* total ip packets generated here */
  120         uint64_t ips_odropped;          /* lost packets due to nobufs, etc. */
  121         uint64_t ips_reassembled;       /* total packets reassembled ok */
  122         uint64_t ips_fragmented;        /* datagrams successfully fragmented */
  123         uint64_t ips_ofragments;        /* output fragments created */
  124         uint64_t ips_cantfrag;          /* don't fragment flag was set, etc. */
  125         uint64_t ips_badoptions;                /* error in option processing */
  126         uint64_t ips_noroute;           /* packets discarded due to no route */
  127         uint64_t ips_badvers;           /* ip version != 4 */
  128         uint64_t ips_rawout;            /* total raw ip packets generated */
  129         uint64_t ips_toolong;           /* ip length > max ip packet size */
  130         uint64_t ips_notmember;         /* multicasts for unregistered grps */
  131         uint64_t ips_nogif;             /* no match gif found */
  132         uint64_t ips_badaddr;           /* invalid address on header */
  133 };
  134 
  135 #ifdef _KERNEL
  136 
  137 #include <sys/counter.h>
  138 #include <net/vnet.h>
  139 
  140 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat);
  141 /*
  142  * In-kernel consumers can use these accessor macros directly to update
  143  * stats.
  144  */
  145 #define IPSTAT_ADD(name, val)   \
  146     VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val))
  147 #define IPSTAT_SUB(name, val)   IPSTAT_ADD(name, -(val))
  148 #define IPSTAT_INC(name)        IPSTAT_ADD(name, 1)
  149 #define IPSTAT_DEC(name)        IPSTAT_SUB(name, 1)
  150 
  151 /*
  152  * Kernel module consumers must use this accessor macro.
  153  */
  154 void    kmod_ipstat_inc(int statnum);
  155 #define KMOD_IPSTAT_INC(name)   \
  156     kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(uint64_t))
  157 void    kmod_ipstat_dec(int statnum);
  158 #define KMOD_IPSTAT_DEC(name)   \
  159     kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(uint64_t))
  160 
  161 /* flags passed to ip_output as last parameter */
  162 #define IP_FORWARDING           0x1             /* most of ip header exists */
  163 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
  164 #define IP_SENDONES             0x4             /* send all-ones broadcast */
  165 #define IP_SENDTOIF             0x8             /* send on specific ifnet */
  166 #define IP_ROUTETOIF            SO_DONTROUTE    /* 0x10 bypass routing tables */
  167 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* 0x20 can send broadcast packets */
  168 #define IP_NODEFAULTFLOWID      0x40            /* Don't set the flowid from inp */
  169 
  170 #ifdef __NO_STRICT_ALIGNMENT
  171 #define IP_HDR_ALIGNED_P(ip)    1
  172 #else
  173 #define IP_HDR_ALIGNED_P(ip)    ((((intptr_t) (ip)) & 3) == 0)
  174 #endif
  175 
  176 struct ip;
  177 struct inpcb;
  178 struct route;
  179 struct sockopt;
  180 struct inpcbinfo;
  181 
  182 VNET_DECLARE(int, ip_defttl);                   /* default IP ttl */
  183 VNET_DECLARE(int, ipforwarding);                /* ip forwarding */
  184 #ifdef IPSTEALTH
  185 VNET_DECLARE(int, ipstealth);                   /* stealth forwarding */
  186 #endif
  187 extern u_char   ip_protox[];
  188 VNET_DECLARE(struct socket *, ip_rsvpd);        /* reservation protocol daemon*/
  189 VNET_DECLARE(struct socket *, ip_mrouter);      /* multicast routing daemon */
  190 extern int      (*legal_vif_num)(int);
  191 extern u_long   (*ip_mcast_src)(int);
  192 VNET_DECLARE(int, rsvp_on);
  193 VNET_DECLARE(int, drop_redirect);
  194 extern struct   pr_usrreqs rip_usrreqs;
  195 
  196 #define V_ip_id                 VNET(ip_id)
  197 #define V_ip_defttl             VNET(ip_defttl)
  198 #define V_ipforwarding          VNET(ipforwarding)
  199 #ifdef IPSTEALTH
  200 #define V_ipstealth             VNET(ipstealth)
  201 #endif
  202 #define V_ip_rsvpd              VNET(ip_rsvpd)
  203 #define V_ip_mrouter            VNET(ip_mrouter)
  204 #define V_rsvp_on               VNET(rsvp_on)
  205 #define V_drop_redirect         VNET(drop_redirect)
  206 
  207 void    inp_freemoptions(struct ip_moptions *);
  208 int     inp_getmoptions(struct inpcb *, struct sockopt *);
  209 int     inp_setmoptions(struct inpcb *, struct sockopt *);
  210 
  211 int     ip_ctloutput(struct socket *, struct sockopt *sopt);
  212 void    ip_drain(void);
  213 int     ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
  214             u_long if_hwassist_flags);
  215 void    ip_forward(struct mbuf *m, int srcrt);
  216 void    ip_init(void);
  217 extern int
  218         (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
  219             struct ip_moptions *);
  220 int     ip_output(struct mbuf *,
  221             struct mbuf *, struct route *, int, struct ip_moptions *,
  222             struct inpcb *);
  223 int     ipproto_register(short);
  224 int     ipproto_unregister(short);
  225 struct mbuf *
  226         ip_reass(struct mbuf *);
  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 int     rip_input(struct mbuf **, int *, int);
  235 int     rip_output(struct mbuf *, struct socket *, ...);
  236 int     ipip_input(struct mbuf **, int *, int);
  237 int     rsvp_input(struct mbuf **, int *, int);
  238 int     ip_rsvp_init(struct socket *);
  239 int     ip_rsvp_done(void);
  240 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
  241 extern void     (*ip_rsvp_force_done)(struct socket *);
  242 extern int      (*rsvp_input_p)(struct mbuf **, int *, int);
  243 
  244 VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */
  245 #define V_inet_pfil_hook        VNET(inet_pfil_hook)
  246 
  247 void    in_delayed_cksum(struct mbuf *m);
  248 
  249 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
  250 /*
  251  * Reference to an ipfw or packet filter rule that can be carried
  252  * outside critical sections.
  253  * A rule is identified by rulenum:rule_id which is ordered.
  254  * In version chain_id the rule can be found in slot 'slot', so
  255  * we don't need a lookup if chain_id == chain->id.
  256  *
  257  * On exit from the firewall this structure refers to the rule after
  258  * the matching one (slot points to the new rule; rulenum:rule_id-1
  259  * is the matching rule), and additional info (e.g. info often contains
  260  * the insn argument or tablearg in the low 16 bits, in host format).
  261  * On entry, the structure is valid if slot>0, and refers to the starting
  262  * rules. 'info' contains the reason for reinject, e.g. divert port,
  263  * divert direction, and so on.
  264  */
  265 struct ipfw_rule_ref {
  266         uint32_t        slot;           /* slot for matching rule       */
  267         uint32_t        rulenum;        /* matching rule number         */
  268         uint32_t        rule_id;        /* matching rule id             */
  269         uint32_t        chain_id;       /* ruleset id                   */
  270         uint32_t        info;           /* see below                    */
  271 };
  272 
  273 enum {
  274         IPFW_INFO_MASK  = 0x0000ffff,
  275         IPFW_INFO_OUT   = 0x00000000,   /* outgoing, just for convenience */
  276         IPFW_INFO_IN    = 0x80000000,   /* incoming, overloads dir */
  277         IPFW_ONEPASS    = 0x40000000,   /* One-pass, do not reinject */
  278         IPFW_IS_MASK    = 0x30000000,   /* which source ? */
  279         IPFW_IS_DIVERT  = 0x20000000,
  280         IPFW_IS_DUMMYNET =0x10000000,
  281         IPFW_IS_PIPE    = 0x08000000,   /* pipe=1, queue = 0 */
  282 };
  283 #define MTAG_IPFW       1148380143      /* IPFW-tagged cookie */
  284 #define MTAG_IPFW_RULE  1262273568      /* rule reference */
  285 #define MTAG_IPFW_CALL  1308397630      /* call stack */
  286 
  287 struct ip_fw_args;
  288 typedef int     (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
  289 typedef int     (*ip_fw_ctl_ptr_t)(struct sockopt *);
  290 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
  291 #define V_ip_fw_ctl_ptr         VNET(ip_fw_ctl_ptr)
  292 
  293 /* Divert hooks. */
  294 extern void     (*ip_divert_ptr)(struct mbuf *m, int incoming);
  295 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
  296 extern int      (*ng_ipfw_input_p)(struct mbuf **, int,
  297                         struct ip_fw_args *, int);
  298 
  299 extern int      (*ip_dn_ctl_ptr)(struct sockopt *);
  300 extern int      (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
  301 #endif /* _KERNEL */
  302 
  303 #endif /* !_NETINET_IP_VAR_H_ */

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