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FreeBSD/Linux Kernel Cross Reference
sys/sys/socketvar.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1990, 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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95
   34  * $FreeBSD: src/sys/sys/socketvar.h,v 1.108 2003/11/16 06:11:26 alc Exp $
   35  */
   36 
   37 #ifndef _SYS_SOCKETVAR_H_
   38 #define _SYS_SOCKETVAR_H_
   39 
   40 #include <sys/queue.h>                  /* for TAILQ macros */
   41 #include <sys/selinfo.h>                /* for struct selinfo */
   42 
   43 /*
   44  * Kernel structure per socket.
   45  * Contains send and receive buffer queues,
   46  * handle on protocol and pointer to protocol
   47  * private data and error information.
   48  */
   49 typedef u_quad_t so_gen_t;
   50 
   51 /*
   52  * List of locks:
   53  * (c)  const, inited in either socreate() or sonewconn()
   54  * (m)  sb_mtx mutex
   55  * (mr) so_rcv.sb_mtx mutex
   56  * (sg) sigio_lock sx
   57  * (sh) sohead_lock sx
   58  *
   59  * Lock of so_rcv.sb_mtx can duplicate, provided that sohead_lock
   60  * is exclusively locked.
   61  *
   62  * Brackets mean that this data is not protected yet.
   63  */
   64 struct socket {
   65         int     so_count;               /* reference count */
   66         short   so_type;                /* generic type, see socket.h */
   67         short   so_options;             /* from socket call, see socket.h */
   68         short   so_linger;              /* time to linger while closing */
   69         short   so_state;               /* internal state flags SS_*, below */
   70         void    *so_pcb;                /* protocol control block */
   71         struct  protosw *so_proto;      /* protocol handle */
   72 /*
   73  * Variables for connection queuing.
   74  * Socket where accepts occur is so_head in all subsidiary sockets.
   75  * If so_head is 0, socket is not related to an accept.
   76  * For head socket so_incomp queues partially completed connections,
   77  * while so_comp is a queue of connections ready to be accepted.
   78  * If a connection is aborted and it has so_head set, then
   79  * it has to be pulled out of either so_incomp or so_comp.
   80  * We allow connections to queue up based on current queue lengths
   81  * and limit on number of queued connections for this socket.
   82  */
   83         struct  socket *so_head;        /* back pointer to accept socket */
   84         TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
   85         TAILQ_HEAD(, socket) so_comp;   /* queue of complete unaccepted connections */
   86         TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */
   87         short   so_qlen;                /* number of unaccepted connections */
   88         short   so_incqlen;             /* number of unaccepted incomplete
   89                                            connections */
   90         short   so_qlimit;              /* max number queued connections */
   91         short   so_timeo;               /* connection timeout */
   92         u_short so_error;               /* error affecting connection */
   93         struct  sigio *so_sigio;        /* [sg] information for async I/O or
   94                                            out of band data (SIGURG) */
   95         u_long  so_oobmark;             /* chars to oob mark */
   96         TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
   97 /*
   98  * Variables for socket buffering.
   99  */
  100         struct sockbuf {
  101                 struct  selinfo sb_sel; /* process selecting read/write */
  102 #define sb_startzero    sb_mb
  103                 struct  mbuf *sb_mb;    /* the mbuf chain */
  104                 struct  mbuf *sb_mbtail; /* the last mbuf in the chain */
  105                 struct  mbuf *sb_lastrecord;    /* first mbuf of last record in
  106                                                  * socket buffer */
  107                 u_int   sb_cc;          /* actual chars in buffer */
  108                 u_int   sb_hiwat;       /* max actual char count */
  109                 u_int   sb_mbcnt;       /* chars of mbufs used */
  110                 u_int   sb_mbmax;       /* max chars of mbufs to use */
  111                 u_int   sb_ctl;         /* non-data chars in buffer */
  112                 int     sb_lowat;       /* low water mark */
  113                 int     sb_timeo;       /* timeout for read/write */
  114                 short   sb_flags;       /* flags, see below */
  115         } so_rcv, so_snd;
  116 #define SB_MAX          (256*1024)      /* default for max chars in sockbuf */
  117 #define SB_LOCK         0x01            /* lock on data queue */
  118 #define SB_WANT         0x02            /* someone is waiting to lock */
  119 #define SB_WAIT         0x04            /* someone is waiting for data/space */
  120 #define SB_SEL          0x08            /* someone is selecting */
  121 #define SB_ASYNC        0x10            /* ASYNC I/O, need signals */
  122 #define SB_UPCALL       0x20            /* someone wants an upcall */
  123 #define SB_NOINTR       0x40            /* operations not interruptible */
  124 #define SB_AIO          0x80            /* AIO operations queued */
  125 #define SB_KNOTE        0x100           /* kernel note attached */
  126 
  127         void    (*so_upcall)(struct socket *, void *, int);
  128         void    *so_upcallarg;
  129         struct  ucred *so_cred;         /* user credentials */
  130         struct  label *so_label;        /* MAC label for socket */
  131         struct  label *so_peerlabel;    /* cached MAC label for socket peer */
  132         /* NB: generation count must not be first; easiest to make it last. */
  133         so_gen_t so_gencnt;             /* generation count */
  134         void    *so_emuldata;           /* private data for emulators */
  135         struct so_accf {
  136                 struct  accept_filter *so_accept_filter;
  137                 void    *so_accept_filter_arg;  /* saved filter args */
  138                 char    *so_accept_filter_str;  /* saved user args */
  139         } *so_accf;
  140 };
  141 
  142 #define SB_EMPTY_FIXUP(sb) do {                                         \
  143         if ((sb)->sb_mb == NULL) {                                      \
  144                 (sb)->sb_mbtail = NULL;                                 \
  145                 (sb)->sb_lastrecord = NULL;                             \
  146         }                                                               \
  147 } while (/*CONSTCOND*/0)
  148 
  149 /*
  150  * Socket state bits.
  151  */
  152 #define SS_NOFDREF              0x0001  /* no file table ref any more */
  153 #define SS_ISCONNECTED          0x0002  /* socket connected to a peer */
  154 #define SS_ISCONNECTING         0x0004  /* in process of connecting to peer */
  155 #define SS_ISDISCONNECTING      0x0008  /* in process of disconnecting */
  156 #define SS_CANTSENDMORE         0x0010  /* can't send more data to peer */
  157 #define SS_CANTRCVMORE          0x0020  /* can't receive more data from peer */
  158 #define SS_RCVATMARK            0x0040  /* at mark on input */
  159 
  160 #define SS_NBIO                 0x0100  /* non-blocking ops */
  161 #define SS_ASYNC                0x0200  /* async i/o notify */
  162 #define SS_ISCONFIRMING         0x0400  /* deciding to accept connection req */
  163 
  164 #define SS_INCOMP               0x0800  /* unaccepted, incomplete connection */
  165 #define SS_COMP                 0x1000  /* unaccepted, complete connection */
  166 #define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */
  167 
  168 /*
  169  * Externalized form of struct socket used by the sysctl(3) interface.
  170  */
  171 struct xsocket {
  172         size_t  xso_len;        /* length of this structure */
  173         struct  socket *xso_so; /* makes a convenient handle sometimes */
  174         short   so_type;
  175         short   so_options;
  176         short   so_linger;
  177         short   so_state;
  178         caddr_t so_pcb;         /* another convenient handle */
  179         int     xso_protocol;
  180         int     xso_family;
  181         short   so_qlen;
  182         short   so_incqlen;
  183         short   so_qlimit;
  184         short   so_timeo;
  185         u_short so_error;
  186         pid_t   so_pgid;
  187         u_long  so_oobmark;
  188         struct xsockbuf {
  189                 u_int   sb_cc;
  190                 u_int   sb_hiwat;
  191                 u_int   sb_mbcnt;
  192                 u_int   sb_mbmax;
  193                 int     sb_lowat;
  194                 int     sb_timeo;
  195                 short   sb_flags;
  196         } so_rcv, so_snd;
  197         uid_t   so_uid;         /* XXX */
  198 };
  199 
  200 /*
  201  * Macros for sockets and socket buffering.
  202  */
  203 
  204 /*
  205  * Do we need to notify the other side when I/O is possible?
  206  */
  207 #define sb_notify(sb)   (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
  208     SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
  209 
  210 /*
  211  * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
  212  * This is problematical if the fields are unsigned, as the space might
  213  * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect
  214  * overflow and return 0.  Should use "lmin" but it doesn't exist now.
  215  */
  216 #define sbspace(sb) \
  217     ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
  218          (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
  219 
  220 /* do we have to send all at once on a socket? */
  221 #define sosendallatonce(so) \
  222     ((so)->so_proto->pr_flags & PR_ATOMIC)
  223 
  224 /* can we read something from so? */
  225 #define soreadable(so) \
  226     ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
  227         ((so)->so_state & SS_CANTRCVMORE) || \
  228         !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
  229 
  230 /* can we write something to so? */
  231 #define sowriteable(so) \
  232     ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
  233         (((so)->so_state&SS_ISCONNECTED) || \
  234           ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
  235      ((so)->so_state & SS_CANTSENDMORE) || \
  236      (so)->so_error)
  237 
  238 /* adjust counters in sb reflecting allocation of m */
  239 #define sballoc(sb, m) { \
  240         (sb)->sb_cc += (m)->m_len; \
  241         if ((m)->m_type != MT_DATA && (m)->m_type != MT_HEADER && \
  242             (m)->m_type != MT_OOBDATA) \
  243                 (sb)->sb_ctl += (m)->m_len; \
  244         (sb)->sb_mbcnt += MSIZE; \
  245         if ((m)->m_flags & M_EXT) \
  246                 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
  247 }
  248 
  249 /* adjust counters in sb reflecting freeing of m */
  250 #define sbfree(sb, m) { \
  251         (sb)->sb_cc -= (m)->m_len; \
  252         if ((m)->m_type != MT_DATA && (m)->m_type != MT_HEADER && \
  253             (m)->m_type != MT_OOBDATA) \
  254                 (sb)->sb_ctl -= (m)->m_len; \
  255         (sb)->sb_mbcnt -= MSIZE; \
  256         if ((m)->m_flags & M_EXT) \
  257                 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
  258 }
  259 
  260 /*
  261  * Set lock on sockbuf sb; sleep if lock is already held.
  262  * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
  263  * Returns error without lock if sleep is interrupted.
  264  */
  265 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
  266                 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
  267                 ((sb)->sb_flags |= SB_LOCK), 0)
  268 
  269 /* release lock on sockbuf sb */
  270 #define sbunlock(sb) { \
  271         (sb)->sb_flags &= ~SB_LOCK; \
  272         if ((sb)->sb_flags & SB_WANT) { \
  273                 (sb)->sb_flags &= ~SB_WANT; \
  274                 wakeup(&(sb)->sb_flags); \
  275         } \
  276 }
  277 
  278 /*
  279  * soref()/sorele() ref-count the socket structure.  Note that you must
  280  * still explicitly close the socket, but the last ref count will free
  281  * the structure.
  282  */
  283 #define soref(so)       do {                    \
  284                                 ++(so)->so_count; \
  285                         } while (0)
  286 
  287 #define sorele(so)      do {                            \
  288                                 if ((so)->so_count <= 0)        \
  289                                         panic("sorele");\
  290                                 if (--(so)->so_count == 0)\
  291                                         sofree(so);     \
  292                         } while (0)
  293 
  294 #define sotryfree(so)   do {                            \
  295                                 if ((so)->so_count == 0)        \
  296                                         sofree(so);     \
  297                         } while(0)
  298 
  299 #define sorwakeup(so)   do {                                    \
  300                                 if (sb_notify(&(so)->so_rcv))   \
  301                                         sowakeup((so), &(so)->so_rcv); \
  302                         } while (0)
  303 
  304 #define sowwakeup(so)   do {                                    \
  305                                 if (sb_notify(&(so)->so_snd))   \
  306                                         sowakeup((so), &(so)->so_snd); \
  307                         } while (0)
  308 
  309 #ifdef _KERNEL
  310 
  311 /*
  312  * Argument structure for sosetopt et seq.  This is in the KERNEL
  313  * section because it will never be visible to user code.
  314  */
  315 enum sopt_dir { SOPT_GET, SOPT_SET };
  316 struct sockopt {
  317         enum    sopt_dir sopt_dir; /* is this a get or a set? */
  318         int     sopt_level;     /* second arg of [gs]etsockopt */
  319         int     sopt_name;      /* third arg of [gs]etsockopt */
  320         void   *sopt_val;       /* fourth arg of [gs]etsockopt */
  321         size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */
  322         struct  thread *sopt_td; /* calling thread or null if kernel */
  323 };
  324 
  325 struct accept_filter {
  326         char    accf_name[16];
  327         void    (*accf_callback)
  328                 (struct socket *so, void *arg, int waitflag);
  329         void *  (*accf_create)
  330                 (struct socket *so, char *arg);
  331         void    (*accf_destroy)
  332                 (struct socket *so);
  333         SLIST_ENTRY(accept_filter) accf_next;
  334 };
  335 
  336 #ifdef MALLOC_DECLARE
  337 MALLOC_DECLARE(M_ACCF);
  338 MALLOC_DECLARE(M_PCB);
  339 MALLOC_DECLARE(M_SONAME);
  340 #endif
  341 
  342 extern int      maxsockets;
  343 extern u_long   sb_max;
  344 extern struct uma_zone *socket_zone;
  345 extern so_gen_t so_gencnt;
  346 
  347 struct mbuf;
  348 struct sockaddr;
  349 struct ucred;
  350 struct uio;
  351 
  352 /*
  353  * From uipc_socket and friends
  354  */
  355 struct  sockaddr *dup_sockaddr(struct sockaddr *sa, int canwait);
  356 int     sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
  357 int     getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
  358 void    sbappend(struct sockbuf *sb, struct mbuf *m);
  359 void    sbappendstream(struct sockbuf *sb, struct mbuf *m);
  360 int     sbappendaddr(struct sockbuf *sb, struct sockaddr *asa,
  361             struct mbuf *m0, struct mbuf *control);
  362 int     sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
  363             struct mbuf *control);
  364 void    sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
  365 void    sbcheck(struct sockbuf *sb);
  366 void    sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
  367 struct mbuf *
  368         sbcreatecontrol(caddr_t p, int size, int type, int level);
  369 void    sbdrop(struct sockbuf *sb, int len);
  370 void    sbdroprecord(struct sockbuf *sb);
  371 void    sbflush(struct sockbuf *sb);
  372 void    sbinsertoob(struct sockbuf *sb, struct mbuf *m0);
  373 void    sbrelease(struct sockbuf *sb, struct socket *so);
  374 int     sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
  375             struct thread *td);
  376 void    sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
  377 int     sbwait(struct sockbuf *sb);
  378 int     sb_lock(struct sockbuf *sb);
  379 int     soabort(struct socket *so);
  380 int     soaccept(struct socket *so, struct sockaddr **nam);
  381 int     socheckuid(struct socket *so, uid_t uid);
  382 struct  socket *soalloc(int waitok);
  383 int     sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
  384 void    socantrcvmore(struct socket *so);
  385 void    socantsendmore(struct socket *so);
  386 int     soclose(struct socket *so);
  387 int     soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
  388 int     soconnect2(struct socket *so1, struct socket *so2);
  389 int     socow_setup(struct mbuf *m0, struct uio *uio);
  390 int     socreate(int dom, struct socket **aso, int type, int proto,
  391             struct ucred *cred, struct thread *td);
  392 void    sodealloc(struct socket *so);
  393 int     sodisconnect(struct socket *so);
  394 void    sofree(struct socket *so);
  395 int     sogetopt(struct socket *so, struct sockopt *sopt);
  396 void    sohasoutofband(struct socket *so);
  397 void    soisconnected(struct socket *so);
  398 void    soisconnecting(struct socket *so);
  399 void    soisdisconnected(struct socket *so);
  400 void    soisdisconnecting(struct socket *so);
  401 int     solisten(struct socket *so, int backlog, struct thread *td);
  402 struct socket *
  403         sonewconn(struct socket *head, int connstatus);
  404 int     sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen);
  405 int     sooptcopyout(struct sockopt *sopt, const void *buf, size_t len);
  406 
  407 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
  408 int     soopt_getm(struct sockopt *sopt, struct mbuf **mp);
  409 int     soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
  410 int     soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
  411 
  412 int     sopoll(struct socket *so, int events, struct ucred *active_cred,
  413             struct thread *td);
  414 int     soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
  415             struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
  416 int     soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
  417 void    sorflush(struct socket *so);
  418 int     sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
  419             struct mbuf *top, struct mbuf *control, int flags,
  420             struct thread *td);
  421 int     sosetopt(struct socket *so, struct sockopt *sopt);
  422 int     soshutdown(struct socket *so, int how);
  423 void    sotoxsocket(struct socket *so, struct xsocket *xso);
  424 void    sowakeup(struct socket *so, struct sockbuf *sb);
  425 
  426 #ifdef SOCKBUF_DEBUG
  427 void    sblastrecordchk(struct sockbuf *, const char *, int);
  428 #define SBLASTRECORDCHK(sb)     sblastrecordchk((sb), __FILE__, __LINE__)
  429 
  430 void    sblastmbufchk(struct sockbuf *, const char *, int);
  431 #define SBLASTMBUFCHK(sb)       sblastmbufchk((sb), __FILE__, __LINE__)
  432 #else
  433 #define SBLASTRECORDCHK(sb)      /* nothing */
  434 #define SBLASTMBUFCHK(sb)        /* nothing */
  435 #endif /* SOCKBUF_DEBUG */
  436 
  437 /*
  438  * Accept filter functions (duh).
  439  */
  440 int     accept_filt_add(struct accept_filter *filt);
  441 int     accept_filt_del(char *name);
  442 struct  accept_filter *accept_filt_get(char *name);
  443 #ifdef ACCEPT_FILTER_MOD
  444 #ifdef SYSCTL_DECL
  445 SYSCTL_DECL(_net_inet_accf);
  446 #endif
  447 int     accept_filt_generic_mod_event(module_t mod, int event, void *data);
  448 #endif
  449 
  450 #endif /* _KERNEL */
  451 
  452 #endif /* !_SYS_SOCKETVAR_H_ */

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