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/netipsec/ipsec.h

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $  */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * IPsec controller part.
   35  */
   36 
   37 #ifndef _NETIPSEC_IPSEC_H_
   38 #define _NETIPSEC_IPSEC_H_
   39 
   40 #include <net/pfkeyv2.h>
   41 #include <netipsec/keydb.h>
   42 
   43 #ifdef _KERNEL
   44 
   45 #include <sys/_lock.h>
   46 #include <sys/_mutex.h>
   47 #include <sys/_rwlock.h>
   48 
   49 #define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m)
   50 
   51 /*
   52  * Security Policy Index
   53  * Ensure that both address families in the "src" and "dst" are same.
   54  * When the value of the ul_proto is ICMPv6, the port field in "src"
   55  * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code.
   56  */
   57 struct secpolicyindex {
   58         union sockaddr_union src;       /* IP src address for SP */
   59         union sockaddr_union dst;       /* IP dst address for SP */
   60         uint8_t ul_proto;               /* upper layer Protocol */
   61         uint8_t dir;                    /* direction of packet flow */
   62         uint8_t prefs;                  /* prefix length in bits for src */
   63         uint8_t prefd;                  /* prefix length in bits for dst */
   64 };
   65 
   66 /* Request for IPsec */
   67 struct ipsecrequest {
   68         struct secasindex saidx;/* hint for search proper SA */
   69                                 /* if __ss_len == 0 then no address specified.*/
   70         u_int level;            /* IPsec level defined below. */
   71 };
   72 
   73 /* Security Policy Data Base */
   74 struct secpolicy {
   75         TAILQ_ENTRY(secpolicy) chain;
   76         LIST_ENTRY(secpolicy) idhash;
   77         LIST_ENTRY(secpolicy) drainq;
   78 
   79         struct secpolicyindex spidx;    /* selector */
   80 #define IPSEC_MAXREQ            4
   81         struct ipsecrequest *req[IPSEC_MAXREQ];
   82         u_int tcount;                   /* IPsec transforms count */
   83         volatile u_int refcnt;          /* reference count */
   84         u_int policy;                   /* policy_type per pfkeyv2.h */
   85         u_int state;
   86 #define IPSEC_SPSTATE_DEAD      0
   87 #define IPSEC_SPSTATE_LARVAL    1
   88 #define IPSEC_SPSTATE_ALIVE     2
   89 #define IPSEC_SPSTATE_PCB       3
   90 #define IPSEC_SPSTATE_IFNET     4
   91         uint32_t priority;              /* priority of this policy */
   92         uint32_t id;                    /* It's unique number on the system. */
   93         /*
   94          * lifetime handler.
   95          * the policy can be used without limitiation if both lifetime and
   96          * validtime are zero.
   97          * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
   98          * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
   99          */
  100         time_t created;         /* time created the policy */
  101         time_t lastused;        /* updated every when kernel sends a packet */
  102         long lifetime;          /* duration of the lifetime of this policy */
  103         long validtime;         /* duration this policy is valid without use */
  104 };
  105 
  106 /*
  107  * PCB security policies.
  108  * Application can setup private security policies for socket.
  109  * Such policies can have IPSEC, BYPASS and ENTRUST type.
  110  * By default, policies are set to NULL. This means that they have ENTRUST type.
  111  * When application sets BYPASS or IPSEC type policy, the flags field
  112  * is also updated. When flags is not set, the system could store
  113  * used security policy into the sp_in/sp_out pointer to speed up further
  114  * lookups.
  115  */
  116 struct inpcbpolicy {
  117         struct secpolicy        *sp_in;
  118         struct secpolicy        *sp_out;
  119 
  120         uint32_t                genid;
  121         uint16_t                flags;
  122 #define INP_INBOUND_POLICY      0x0001
  123 #define INP_OUTBOUND_POLICY     0x0002
  124         uint16_t                hdrsz;
  125 };
  126 
  127 /* SP acquiring list table. */
  128 struct secspacq {
  129         LIST_ENTRY(secspacq) chain;
  130 
  131         struct secpolicyindex spidx;
  132 
  133         time_t created;         /* for lifetime */
  134         int count;              /* for lifetime */
  135         /* XXX: here is mbuf place holder to be sent ? */
  136 };
  137 #endif /* _KERNEL */
  138 
  139 /* buffer size for formatted output of ipsec address */
  140 #define IPSEC_ADDRSTRLEN        (INET6_ADDRSTRLEN + 11)
  141 
  142 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
  143 #define IPSEC_PORT_ANY          0
  144 #define IPSEC_ULPROTO_ANY       255
  145 #define IPSEC_PROTO_ANY         255
  146 
  147 /* mode of security protocol */
  148 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD.  It's only use in SAD */
  149 #define IPSEC_MODE_ANY          0       /* i.e. wildcard. */
  150 #define IPSEC_MODE_TRANSPORT    1
  151 #define IPSEC_MODE_TUNNEL       2
  152 #define IPSEC_MODE_TCPMD5       3       /* TCP MD5 mode */
  153 
  154 /*
  155  * Direction of security policy.
  156  * NOTE: Since INVALID is used just as flag.
  157  * The other are used for loop counter too.
  158  */
  159 #define IPSEC_DIR_ANY           0
  160 #define IPSEC_DIR_INBOUND       1
  161 #define IPSEC_DIR_OUTBOUND      2
  162 #define IPSEC_DIR_MAX           3
  163 #define IPSEC_DIR_INVALID       4
  164 
  165 /* Policy level */
  166 /*
  167  * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
  168  * DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
  169  * DISCARD and NONE are allowed for system default.
  170  */
  171 #define IPSEC_POLICY_DISCARD    0       /* discarding packet */
  172 #define IPSEC_POLICY_NONE       1       /* through IPsec engine */
  173 #define IPSEC_POLICY_IPSEC      2       /* do IPsec */
  174 #define IPSEC_POLICY_ENTRUST    3       /* consulting SPD if present. */
  175 #define IPSEC_POLICY_BYPASS     4       /* only for privileged socket. */
  176 
  177 /* Policy scope */
  178 #define IPSEC_POLICYSCOPE_ANY           0x00    /* unspecified */
  179 #define IPSEC_POLICYSCOPE_GLOBAL        0x01    /* global scope */
  180 #define IPSEC_POLICYSCOPE_IFNET         0x02    /* if_ipsec(4) scope */
  181 #define IPSEC_POLICYSCOPE_PCB           0x04    /* PCB scope */
  182 
  183 /* Security protocol level */
  184 #define IPSEC_LEVEL_DEFAULT     0       /* reference to system default */
  185 #define IPSEC_LEVEL_USE         1       /* use SA if present. */
  186 #define IPSEC_LEVEL_REQUIRE     2       /* require SA. */
  187 #define IPSEC_LEVEL_UNIQUE      3       /* unique SA. */
  188 
  189 #define IPSEC_MANUAL_REQID_MAX  0x3fff
  190                                 /*
  191                                  * if security policy level == unique, this id
  192                                  * indicate to a relative SA for use, else is
  193                                  * zero.
  194                                  * 1 - 0x3fff are reserved for manual keying.
  195                                  * 0 are reserved for above reason.  Others is
  196                                  * for kernel use.
  197                                  * Note that this id doesn't identify SA
  198                                  * by only itself.
  199                                  */
  200 #define IPSEC_REPLAYWSIZE  32
  201 
  202 /* statistics for ipsec processing */
  203 struct ipsecstat {
  204         uint64_t ips_in_polvio;         /* input: sec policy violation */
  205         uint64_t ips_in_nomem;          /* input: no memory available */
  206         uint64_t ips_in_inval;          /* input: generic error */
  207 
  208         uint64_t ips_out_polvio;        /* output: sec policy violation */
  209         uint64_t ips_out_nosa;          /* output: SA unavailable  */
  210         uint64_t ips_out_nomem;         /* output: no memory available */
  211         uint64_t ips_out_noroute;       /* output: no route available */
  212         uint64_t ips_out_inval;         /* output: generic error */
  213         uint64_t ips_out_bundlesa;      /* output: bundled SA processed */
  214 
  215         uint64_t ips_mbcoalesced;       /* mbufs coalesced during clone */
  216         uint64_t ips_clcoalesced;       /* clusters coalesced during clone */
  217         uint64_t ips_clcopied;          /* clusters copied during clone */
  218         uint64_t ips_mbinserted;        /* mbufs inserted during makespace */
  219         /* 
  220          * Temporary statistics for performance analysis.
  221          */
  222         /* See where ESP/AH/IPCOMP header land in mbuf on input */
  223         uint64_t ips_input_front;
  224         uint64_t ips_input_middle;
  225         uint64_t ips_input_end;
  226 };
  227 
  228 /*
  229  * Definitions for IPsec & Key sysctl operations.
  230  */
  231 #define IPSECCTL_STATS                  1       /* stats */
  232 #define IPSECCTL_DEF_POLICY             2
  233 #define IPSECCTL_DEF_ESP_TRANSLEV       3       /* int; ESP transport mode */
  234 #define IPSECCTL_DEF_ESP_NETLEV         4       /* int; ESP tunnel mode */
  235 #define IPSECCTL_DEF_AH_TRANSLEV        5       /* int; AH transport mode */
  236 #define IPSECCTL_DEF_AH_NETLEV          6       /* int; AH tunnel mode */
  237 #if 0   /* obsolete, do not reuse */
  238 #define IPSECCTL_INBOUND_CALL_IKE       7
  239 #endif
  240 #define IPSECCTL_AH_CLEARTOS            8
  241 #define IPSECCTL_AH_OFFSETMASK          9
  242 #define IPSECCTL_DFBIT                  10
  243 #define IPSECCTL_ECN                    11
  244 #define IPSECCTL_DEBUG                  12
  245 #define IPSECCTL_ESP_RANDPAD            13
  246 
  247 #ifdef _KERNEL
  248 #include <sys/counter.h>
  249 
  250 struct ipsec_ctx_data;
  251 #define IPSEC_INIT_CTX(_ctx, _mp, _inp, _sav, _af, _enc) do {   \
  252         (_ctx)->mp = (_mp);                             \
  253         (_ctx)->inp = (_inp);                           \
  254         (_ctx)->sav = (_sav);                           \
  255         (_ctx)->af = (_af);                             \
  256         (_ctx)->enc = (_enc);                           \
  257 } while(0)
  258 int     ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int direction);
  259 
  260 VNET_DECLARE(int, ipsec_debug);
  261 #define V_ipsec_debug           VNET(ipsec_debug)
  262 
  263 #ifdef REGRESSION
  264 VNET_DECLARE(int, ipsec_replay);
  265 VNET_DECLARE(int, ipsec_integrity);
  266 
  267 #define V_ipsec_replay          VNET(ipsec_replay)
  268 #define V_ipsec_integrity       VNET(ipsec_integrity)
  269 #endif
  270 
  271 VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat);
  272 VNET_DECLARE(int, ip4_esp_trans_deflev);
  273 VNET_DECLARE(int, ip4_esp_net_deflev);
  274 VNET_DECLARE(int, ip4_ah_trans_deflev);
  275 VNET_DECLARE(int, ip4_ah_net_deflev);
  276 VNET_DECLARE(int, ip4_ipsec_dfbit);
  277 VNET_DECLARE(int, ip4_ipsec_ecn);
  278 VNET_DECLARE(int, crypto_support);
  279 VNET_DECLARE(int, natt_cksum_policy);
  280 
  281 extern struct timeval ipsec_warn_interval;
  282 
  283 #define IPSECSTAT_INC(name)     \
  284     VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1)
  285 #define V_ip4_esp_trans_deflev  VNET(ip4_esp_trans_deflev)
  286 #define V_ip4_esp_net_deflev    VNET(ip4_esp_net_deflev)
  287 #define V_ip4_ah_trans_deflev   VNET(ip4_ah_trans_deflev)
  288 #define V_ip4_ah_net_deflev     VNET(ip4_ah_net_deflev)
  289 #define V_ip4_ipsec_dfbit       VNET(ip4_ipsec_dfbit)
  290 #define V_ip4_ipsec_ecn         VNET(ip4_ipsec_ecn)
  291 #define V_crypto_support        VNET(crypto_support)
  292 #define V_natt_cksum_policy     VNET(natt_cksum_policy)
  293 
  294 #define ipseclog(x)     do { if (V_ipsec_debug) log x; } while (0)
  295 /* for openbsd compatibility */
  296 #ifdef IPSEC_DEBUG
  297 #define IPSEC_DEBUG_DECLARE(x)  x
  298 #define DPRINTF(x)      do { if (V_ipsec_debug) printf x; } while (0)
  299 #else
  300 #define IPSEC_DEBUG_DECLARE(x)
  301 #define DPRINTF(x)
  302 #endif
  303 
  304 struct inpcb;
  305 struct m_tag;
  306 struct secasvar;
  307 struct sockopt;
  308 struct tcphdr;
  309 union sockaddr_union;
  310 
  311 int ipsec_if_input(struct mbuf *, struct secasvar *, uint32_t);
  312 
  313 struct ipsecrequest *ipsec_newisr(void);
  314 void ipsec_delisr(struct ipsecrequest *);
  315 struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *,
  316     int *, int);
  317 
  318 u_int ipsec_get_reqlevel(struct secpolicy *, u_int);
  319 
  320 void udp_ipsec_adjust_cksum(struct mbuf *, struct secasvar *, int, int);
  321 int udp_ipsec_output(struct mbuf *, struct secasvar *);
  322 int udp_ipsec_input(struct mbuf *, int, int);
  323 int udp_ipsec_pcbctl(struct inpcb *, struct sockopt *);
  324 
  325 int ipsec_chkreplay(uint32_t, struct secasvar *);
  326 int ipsec_updatereplay(uint32_t, struct secasvar *);
  327 int ipsec_updateid(struct secasvar *, uint64_t *, uint64_t *);
  328 int ipsec_initialized(void);
  329 
  330 void ipsec_setspidx_inpcb(struct inpcb *, struct secpolicyindex *, u_int);
  331 
  332 void ipsec4_setsockaddrs(const struct mbuf *, union sockaddr_union *,
  333     union sockaddr_union *);
  334 int ipsec4_in_reject(const struct mbuf *, struct inpcb *);
  335 int ipsec4_input(struct mbuf *, int, int);
  336 int ipsec4_forward(struct mbuf *);
  337 int ipsec4_pcbctl(struct inpcb *, struct sockopt *);
  338 int ipsec4_output(struct mbuf *, struct inpcb *);
  339 int ipsec4_capability(struct mbuf *, u_int);
  340 int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, int, int);
  341 int ipsec4_process_packet(struct mbuf *, struct secpolicy *, struct inpcb *);
  342 int ipsec_process_done(struct mbuf *, struct secpolicy *, struct secasvar *,
  343     u_int);
  344 
  345 extern  void m_checkalignment(const char* where, struct mbuf *m0,
  346                 int off, int len);
  347 extern  struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off);
  348 extern  caddr_t m_pad(struct mbuf *m, int n);
  349 extern  int m_striphdr(struct mbuf *m, int skip, int hlen);
  350 
  351 #endif /* _KERNEL */
  352 
  353 #ifndef _KERNEL
  354 extern caddr_t ipsec_set_policy(char *, int);
  355 extern int ipsec_get_policylen(caddr_t);
  356 extern char *ipsec_dump_policy(caddr_t, char *);
  357 extern const char *ipsec_strerror(void);
  358 
  359 #endif /* ! KERNEL */
  360 
  361 #endif /* _NETIPSEC_IPSEC_H_ */

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