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/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  * 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  *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95
   30  *
   31  * $FreeBSD: releng/10.2/sys/sys/socketvar.h 255608 2013-09-16 06:25:54Z kib $
   32  */
   33 
   34 #ifndef _SYS_SOCKETVAR_H_
   35 #define _SYS_SOCKETVAR_H_
   36 
   37 #include <sys/queue.h>                  /* for TAILQ macros */
   38 #include <sys/selinfo.h>                /* for struct selinfo */
   39 #include <sys/_lock.h>
   40 #include <sys/_mutex.h>
   41 #include <sys/_sx.h>
   42 #include <sys/sockbuf.h>
   43 #include <sys/sockstate.h>
   44 #ifdef _KERNEL
   45 #include <sys/sockopt.h>
   46 #endif
   47 
   48 struct vnet;
   49 
   50 /*
   51  * Kernel structure per socket.
   52  * Contains send and receive buffer queues,
   53  * handle on protocol and pointer to protocol
   54  * private data and error information.
   55  */
   56 typedef u_quad_t so_gen_t;
   57 
   58 struct socket;
   59 
   60 /*-
   61  * Locking key to struct socket:
   62  * (a) constant after allocation, no locking required.
   63  * (b) locked by SOCK_LOCK(so).
   64  * (c) locked by SOCKBUF_LOCK(&so->so_rcv).
   65  * (d) locked by SOCKBUF_LOCK(&so->so_snd).
   66  * (e) locked by ACCEPT_LOCK().
   67  * (f) not locked since integer reads/writes are atomic.
   68  * (g) used only as a sleep/wakeup address, no value.
   69  * (h) locked by global mutex so_global_mtx.
   70  */
   71 struct socket {
   72         int     so_count;               /* (b) reference count */
   73         short   so_type;                /* (a) generic type, see socket.h */
   74         short   so_options;             /* from socket call, see socket.h */
   75         short   so_linger;              /* time to linger while closing */
   76         short   so_state;               /* (b) internal state flags SS_* */
   77         int     so_qstate;              /* (e) internal state flags SQ_* */
   78         void    *so_pcb;                /* protocol control block */
   79         struct  vnet *so_vnet;          /* network stack instance */
   80         struct  protosw *so_proto;      /* (a) protocol handle */
   81 /*
   82  * Variables for connection queuing.
   83  * Socket where accepts occur is so_head in all subsidiary sockets.
   84  * If so_head is 0, socket is not related to an accept.
   85  * For head socket so_incomp queues partially completed connections,
   86  * while so_comp is a queue of connections ready to be accepted.
   87  * If a connection is aborted and it has so_head set, then
   88  * it has to be pulled out of either so_incomp or so_comp.
   89  * We allow connections to queue up based on current queue lengths
   90  * and limit on number of queued connections for this socket.
   91  */
   92         struct  socket *so_head;        /* (e) back pointer to listen socket */
   93         TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */
   94         TAILQ_HEAD(, socket) so_comp;   /* (e) queue of complete unaccepted connections */
   95         TAILQ_ENTRY(socket) so_list;    /* (e) list of unaccepted connections */
   96         u_short so_qlen;                /* (e) number of unaccepted connections */
   97         u_short so_incqlen;             /* (e) number of unaccepted incomplete
   98                                            connections */
   99         u_short so_qlimit;              /* (e) max number queued connections */
  100         short   so_timeo;               /* (g) connection timeout */
  101         u_short so_error;               /* (f) error affecting connection */
  102         struct  sigio *so_sigio;        /* [sg] information for async I/O or
  103                                            out of band data (SIGURG) */
  104         u_long  so_oobmark;             /* (c) chars to oob mark */
  105         TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
  106 
  107         struct sockbuf so_rcv, so_snd;
  108 
  109         struct  ucred *so_cred;         /* (a) user credentials */
  110         struct  label *so_label;        /* (b) MAC label for socket */
  111         struct  label *so_peerlabel;    /* (b) cached MAC label for peer */
  112         /* NB: generation count must not be first. */
  113         so_gen_t so_gencnt;             /* (h) generation count */
  114         void    *so_emuldata;           /* (b) private data for emulators */
  115         struct so_accf {
  116                 struct  accept_filter *so_accept_filter;
  117                 void    *so_accept_filter_arg;  /* saved filter args */
  118                 char    *so_accept_filter_str;  /* saved user args */
  119         } *so_accf;
  120         /*
  121          * so_fibnum, so_user_cookie and friends can be used to attach
  122          * some user-specified metadata to a socket, which then can be
  123          * used by the kernel for various actions.
  124          * so_user_cookie is used by ipfw/dummynet.
  125          */
  126         int so_fibnum;          /* routing domain for this socket */
  127         uint32_t so_user_cookie;
  128 };
  129 
  130 /*
  131  * Global accept mutex to serialize access to accept queues and
  132  * fields associated with multiple sockets.  This allows us to
  133  * avoid defining a lock order between listen and accept sockets
  134  * until such time as it proves to be a good idea.
  135  */
  136 extern struct mtx accept_mtx;
  137 #define ACCEPT_LOCK_ASSERT()            mtx_assert(&accept_mtx, MA_OWNED)
  138 #define ACCEPT_UNLOCK_ASSERT()          mtx_assert(&accept_mtx, MA_NOTOWNED)
  139 #define ACCEPT_LOCK()                   mtx_lock(&accept_mtx)
  140 #define ACCEPT_UNLOCK()                 mtx_unlock(&accept_mtx)
  141 
  142 /*
  143  * Per-socket mutex: we reuse the receive socket buffer mutex for space
  144  * efficiency.  This decision should probably be revisited as we optimize
  145  * locking for the socket code.
  146  */
  147 #define SOCK_MTX(_so)                   SOCKBUF_MTX(&(_so)->so_rcv)
  148 #define SOCK_LOCK(_so)                  SOCKBUF_LOCK(&(_so)->so_rcv)
  149 #define SOCK_OWNED(_so)                 SOCKBUF_OWNED(&(_so)->so_rcv)
  150 #define SOCK_UNLOCK(_so)                SOCKBUF_UNLOCK(&(_so)->so_rcv)
  151 #define SOCK_LOCK_ASSERT(_so)           SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv)
  152 
  153 /*
  154  * Socket state bits stored in so_qstate.
  155  */
  156 #define SQ_INCOMP               0x0800  /* unaccepted, incomplete connection */
  157 #define SQ_COMP                 0x1000  /* unaccepted, complete connection */
  158 
  159 /*
  160  * Externalized form of struct socket used by the sysctl(3) interface.
  161  */
  162 struct xsocket {
  163         size_t  xso_len;        /* length of this structure */
  164         struct  socket *xso_so; /* makes a convenient handle sometimes */
  165         short   so_type;
  166         short   so_options;
  167         short   so_linger;
  168         short   so_state;
  169         caddr_t so_pcb;         /* another convenient handle */
  170         int     xso_protocol;
  171         int     xso_family;
  172         u_short so_qlen;
  173         u_short so_incqlen;
  174         u_short so_qlimit;
  175         short   so_timeo;
  176         u_short so_error;
  177         pid_t   so_pgid;
  178         u_long  so_oobmark;
  179         struct xsockbuf so_rcv, so_snd;
  180         uid_t   so_uid;         /* XXX */
  181 };
  182 
  183 #ifdef _KERNEL
  184 
  185 /*
  186  * Macros for sockets and socket buffering.
  187  */
  188 
  189 /*
  190  * Flags to sblock().
  191  */
  192 #define SBL_WAIT        0x00000001      /* Wait if not immediately available. */
  193 #define SBL_NOINTR      0x00000002      /* Force non-interruptible sleep. */
  194 #define SBL_VALID       (SBL_WAIT | SBL_NOINTR)
  195 
  196 /*
  197  * Do we need to notify the other side when I/O is possible?
  198  */
  199 #define sb_notify(sb)   (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
  200     SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
  201 
  202 /* do we have to send all at once on a socket? */
  203 #define sosendallatonce(so) \
  204     ((so)->so_proto->pr_flags & PR_ATOMIC)
  205 
  206 /* can we read something from so? */
  207 #define soreadabledata(so) \
  208     ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
  209         !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
  210 #define soreadable(so) \
  211         (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
  212 
  213 /* can we write something to so? */
  214 #define sowriteable(so) \
  215     ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
  216         (((so)->so_state&SS_ISCONNECTED) || \
  217           ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
  218      ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
  219      (so)->so_error)
  220 
  221 /*
  222  * soref()/sorele() ref-count the socket structure.  Note that you must
  223  * still explicitly close the socket, but the last ref count will free
  224  * the structure.
  225  */
  226 #define soref(so) do {                                                  \
  227         SOCK_LOCK_ASSERT(so);                                           \
  228         ++(so)->so_count;                                               \
  229 } while (0)
  230 
  231 #define sorele(so) do {                                                 \
  232         ACCEPT_LOCK_ASSERT();                                           \
  233         SOCK_LOCK_ASSERT(so);                                           \
  234         if ((so)->so_count <= 0)                                        \
  235                 panic("sorele");                                        \
  236         if (--(so)->so_count == 0)                                      \
  237                 sofree(so);                                             \
  238         else {                                                          \
  239                 SOCK_UNLOCK(so);                                        \
  240                 ACCEPT_UNLOCK();                                        \
  241         }                                                               \
  242 } while (0)
  243 
  244 /*
  245  * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
  246  * avoid a non-atomic test-and-wakeup.  However, sowakeup is
  247  * responsible for releasing the lock if it is called.  We unlock only
  248  * if we don't call into sowakeup.  If any code is introduced that
  249  * directly invokes the underlying sowakeup() primitives, it must
  250  * maintain the same semantics.
  251  */
  252 #define sorwakeup_locked(so) do {                                       \
  253         SOCKBUF_LOCK_ASSERT(&(so)->so_rcv);                             \
  254         if (sb_notify(&(so)->so_rcv))                                   \
  255                 sowakeup((so), &(so)->so_rcv);                          \
  256         else                                                            \
  257                 SOCKBUF_UNLOCK(&(so)->so_rcv);                          \
  258 } while (0)
  259 
  260 #define sorwakeup(so) do {                                              \
  261         SOCKBUF_LOCK(&(so)->so_rcv);                                    \
  262         sorwakeup_locked(so);                                           \
  263 } while (0)
  264 
  265 #define sowwakeup_locked(so) do {                                       \
  266         SOCKBUF_LOCK_ASSERT(&(so)->so_snd);                             \
  267         if (sb_notify(&(so)->so_snd))                                   \
  268                 sowakeup((so), &(so)->so_snd);                          \
  269         else                                                            \
  270                 SOCKBUF_UNLOCK(&(so)->so_snd);                          \
  271 } while (0)
  272 
  273 #define sowwakeup(so) do {                                              \
  274         SOCKBUF_LOCK(&(so)->so_snd);                                    \
  275         sowwakeup_locked(so);                                           \
  276 } while (0)
  277 
  278 struct accept_filter {
  279         char    accf_name[16];
  280         int     (*accf_callback)
  281                 (struct socket *so, void *arg, int waitflag);
  282         void *  (*accf_create)
  283                 (struct socket *so, char *arg);
  284         void    (*accf_destroy)
  285                 (struct socket *so);
  286         SLIST_ENTRY(accept_filter) accf_next;
  287 };
  288 
  289 #ifdef MALLOC_DECLARE
  290 MALLOC_DECLARE(M_ACCF);
  291 MALLOC_DECLARE(M_PCB);
  292 MALLOC_DECLARE(M_SONAME);
  293 #endif
  294 
  295 extern int      maxsockets;
  296 extern u_long   sb_max;
  297 extern so_gen_t so_gencnt;
  298 
  299 struct mbuf;
  300 struct sockaddr;
  301 struct ucred;
  302 struct uio;
  303 
  304 /* 'which' values for socket upcalls. */
  305 #define SO_RCV          1
  306 #define SO_SND          2
  307 
  308 /* Return values for socket upcalls. */
  309 #define SU_OK           0
  310 #define SU_ISCONNECTED  1
  311 
  312 /*
  313  * From uipc_socket and friends
  314  */
  315 int     sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type);
  316 int     getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len);
  317 void    soabort(struct socket *so);
  318 int     soaccept(struct socket *so, struct sockaddr **nam);
  319 int     socheckuid(struct socket *so, uid_t uid);
  320 int     sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
  321 int     sobindat(int fd, struct socket *so, struct sockaddr *nam,
  322             struct thread *td);
  323 int     soclose(struct socket *so);
  324 int     soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
  325 int     soconnectat(int fd, struct socket *so, struct sockaddr *nam,
  326             struct thread *td);
  327 int     soconnect2(struct socket *so1, struct socket *so2);
  328 int     socreate(int dom, struct socket **aso, int type, int proto,
  329             struct ucred *cred, struct thread *td);
  330 int     sodisconnect(struct socket *so);
  331 struct  sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
  332 void    sofree(struct socket *so);
  333 void    sohasoutofband(struct socket *so);
  334 int     solisten(struct socket *so, int backlog, struct thread *td);
  335 void    solisten_proto(struct socket *so, int backlog);
  336 int     solisten_proto_check(struct socket *so);
  337 struct socket *
  338         sonewconn(struct socket *head, int connstatus);
  339 
  340 
  341 int     sopoll(struct socket *so, int events, struct ucred *active_cred,
  342             struct thread *td);
  343 int     sopoll_generic(struct socket *so, int events,
  344             struct ucred *active_cred, struct thread *td);
  345 int     soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
  346             struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
  347 int     soreceive_stream(struct socket *so, struct sockaddr **paddr,
  348             struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
  349             int *flagsp);
  350 int     soreceive_dgram(struct socket *so, struct sockaddr **paddr,
  351             struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
  352             int *flagsp);
  353 int     soreceive_generic(struct socket *so, struct sockaddr **paddr,
  354             struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
  355             int *flagsp);
  356 int     soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
  357 void    sorflush(struct socket *so);
  358 int     sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
  359             struct mbuf *top, struct mbuf *control, int flags,
  360             struct thread *td);
  361 int     sosend_dgram(struct socket *so, struct sockaddr *addr,
  362             struct uio *uio, struct mbuf *top, struct mbuf *control,
  363             int flags, struct thread *td);
  364 int     sosend_generic(struct socket *so, struct sockaddr *addr,
  365             struct uio *uio, struct mbuf *top, struct mbuf *control,
  366             int flags, struct thread *td);
  367 int     soshutdown(struct socket *so, int how);
  368 void    sotoxsocket(struct socket *so, struct xsocket *xso);
  369 void    soupcall_clear(struct socket *so, int which);
  370 void    soupcall_set(struct socket *so, int which,
  371             int (*func)(struct socket *, void *, int), void *arg);
  372 void    sowakeup(struct socket *so, struct sockbuf *sb);
  373 int     selsocket(struct socket *so, int events, struct timeval *tv,
  374             struct thread *td);
  375 
  376 /*
  377  * Accept filter functions (duh).
  378  */
  379 int     accept_filt_add(struct accept_filter *filt);
  380 int     accept_filt_del(char *name);
  381 struct  accept_filter *accept_filt_get(char *name);
  382 #ifdef ACCEPT_FILTER_MOD
  383 #ifdef SYSCTL_DECL
  384 SYSCTL_DECL(_net_inet_accf);
  385 #endif
  386 int     accept_filt_generic_mod_event(module_t mod, int event, void *data);
  387 #endif
  388 
  389 #endif /* _KERNEL */
  390 
  391 #endif /* !_SYS_SOCKETVAR_H_ */

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