/*- * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)socketvar.h 8.3 (Berkeley) 2/19/95 * $FreeBSD$ */ #ifndef _SYS_SOCKETVAR_H_ #define _SYS_SOCKETVAR_H_ #include /* for struct label */ #include /* for TAILQ macros */ #include /* for struct selinfo */ /* * Kernel structure per socket. * Contains send and receive buffer queues, * handle on protocol and pointer to protocol * private data and error information. */ typedef u_quad_t so_gen_t; /* * List of locks: * (c) const, inited in either socreate() or sonewconn() * (m) sb_mtx mutex * (mr) so_rcv.sb_mtx mutex * (sg) sigio_lock sx * (sh) sohead_lock sx * * Lock of so_rcv.sb_mtx can duplicate, provided that sohead_lock * is exclusively locked. * * Brackets mean that this data is not protected yet. */ struct socket { int so_count; /* reference count */ short so_type; /* generic type, see socket.h */ short so_options; /* from socket call, see socket.h */ short so_linger; /* time to linger while closing */ short so_state; /* internal state flags SS_*, below */ void *so_pcb; /* protocol control block */ struct protosw *so_proto; /* protocol handle */ /* * Variables for connection queuing. * Socket where accepts occur is so_head in all subsidiary sockets. * If so_head is 0, socket is not related to an accept. * For head socket so_incomp queues partially completed connections, * while so_comp is a queue of connections ready to be accepted. * If a connection is aborted and it has so_head set, then * it has to be pulled out of either so_incomp or so_comp. * We allow connections to queue up based on current queue lengths * and limit on number of queued connections for this socket. */ struct socket *so_head; /* back pointer to accept socket */ TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */ TAILQ_HEAD(, socket) so_comp; /* queue of complete unaccepted connections */ TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */ short so_qlen; /* number of unaccepted connections */ short so_incqlen; /* number of unaccepted incomplete connections */ short so_qlimit; /* max number queued connections */ short so_timeo; /* connection timeout */ u_short so_error; /* error affecting connection */ struct sigio *so_sigio; /* [sg] information for async I/O or out of band data (SIGURG) */ u_long so_oobmark; /* chars to oob mark */ TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */ /* * Variables for socket buffering. */ struct sockbuf { struct selinfo sb_sel; /* process selecting read/write */ struct mbuf *sb_mb; /* the mbuf chain */ u_int sb_cc; /* actual chars in buffer */ u_int sb_hiwat; /* max actual char count */ u_int sb_mbcnt; /* chars of mbufs used */ u_int sb_mbmax; /* max chars of mbufs to use */ int sb_lowat; /* low water mark */ int sb_timeo; /* timeout for read/write */ short sb_flags; /* flags, see below */ } so_rcv, so_snd; #define SB_MAX (256*1024) /* default for max chars in sockbuf */ #define SB_LOCK 0x01 /* lock on data queue */ #define SB_WANT 0x02 /* someone is waiting to lock */ #define SB_WAIT 0x04 /* someone is waiting for data/space */ #define SB_SEL 0x08 /* someone is selecting */ #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */ #define SB_UPCALL 0x20 /* someone wants an upcall */ #define SB_NOINTR 0x40 /* operations not interruptible */ #define SB_AIO 0x80 /* AIO operations queued */ #define SB_KNOTE 0x100 /* kernel note attached */ void (*so_upcall)(struct socket *, void *, int); void *so_upcallarg; struct ucred *so_cred; /* user credentials */ struct label so_label; /* MAC label for socket */ struct label so_peerlabel; /* cached MAC label for socket peer */ /* NB: generation count must not be first; easiest to make it last. */ so_gen_t so_gencnt; /* generation count */ void *so_emuldata; /* private data for emulators */ struct so_accf { struct accept_filter *so_accept_filter; void *so_accept_filter_arg; /* saved filter args */ char *so_accept_filter_str; /* saved user args */ } *so_accf; }; /* * Socket state bits. */ #define SS_NOFDREF 0x0001 /* no file table ref any more */ #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */ #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */ #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */ #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */ #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */ #define SS_RCVATMARK 0x0040 /* at mark on input */ #define SS_NBIO 0x0100 /* non-blocking ops */ #define SS_ASYNC 0x0200 /* async i/o notify */ #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */ #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */ #define SS_COMP 0x1000 /* unaccepted, complete connection */ #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */ /* * Externalized form of struct socket used by the sysctl(3) interface. */ struct xsocket { size_t xso_len; /* length of this structure */ struct socket *xso_so; /* makes a convenient handle sometimes */ short so_type; short so_options; short so_linger; short so_state; caddr_t so_pcb; /* another convenient handle */ int xso_protocol; int xso_family; short so_qlen; short so_incqlen; short so_qlimit; short so_timeo; u_short so_error; pid_t so_pgid; u_long so_oobmark; struct xsockbuf { u_int sb_cc; u_int sb_hiwat; u_int sb_mbcnt; u_int sb_mbmax; int sb_lowat; int sb_timeo; short sb_flags; } so_rcv, so_snd; uid_t so_uid; /* XXX */ }; /* * Macros for sockets and socket buffering. */ /* * Do we need to notify the other side when I/O is possible? */ #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \ SB_UPCALL | SB_AIO | SB_KNOTE)) != 0) /* * How much space is there in a socket buffer (so->so_snd or so->so_rcv)? * This is problematical if the fields are unsigned, as the space might * still be negative (cc > hiwat or mbcnt > mbmax). Should detect * overflow and return 0. Should use "lmin" but it doesn't exist now. */ #define sbspace(sb) \ ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \ (int)((sb)->sb_mbmax - (sb)->sb_mbcnt))) /* do we have to send all at once on a socket? */ #define sosendallatonce(so) \ ((so)->so_proto->pr_flags & PR_ATOMIC) /* can we read something from so? */ #define soreadable(so) \ ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \ ((so)->so_state & SS_CANTRCVMORE) || \ !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error) /* can we write something to so? */ #define sowriteable(so) \ ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \ (((so)->so_state&SS_ISCONNECTED) || \ ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \ ((so)->so_state & SS_CANTSENDMORE) || \ (so)->so_error) /* adjust counters in sb reflecting allocation of m */ #define sballoc(sb, m) { \ (sb)->sb_cc += (m)->m_len; \ (sb)->sb_mbcnt += MSIZE; \ if ((m)->m_flags & M_EXT) \ (sb)->sb_mbcnt += (m)->m_ext.ext_size; \ } /* adjust counters in sb reflecting freeing of m */ #define sbfree(sb, m) { \ (sb)->sb_cc -= (m)->m_len; \ (sb)->sb_mbcnt -= MSIZE; \ if ((m)->m_flags & M_EXT) \ (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \ } /* * Set lock on sockbuf sb; sleep if lock is already held. * Unless SB_NOINTR is set on sockbuf, sleep is interruptible. * Returns error without lock if sleep is interrupted. */ #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \ (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \ ((sb)->sb_flags |= SB_LOCK), 0) /* release lock on sockbuf sb */ #define sbunlock(sb) { \ (sb)->sb_flags &= ~SB_LOCK; \ if ((sb)->sb_flags & SB_WANT) { \ (sb)->sb_flags &= ~SB_WANT; \ wakeup((caddr_t)&(sb)->sb_flags); \ } \ } /* * soref()/sorele() ref-count the socket structure. Note that you must * still explicitly close the socket, but the last ref count will free * the structure. */ #define soref(so) do { \ ++(so)->so_count; \ } while (0) #define sorele(so) do { \ if ((so)->so_count <= 0) \ panic("sorele");\ if (--(so)->so_count == 0)\ sofree(so); \ } while (0) #define sotryfree(so) do { \ if ((so)->so_count == 0) \ sofree(so); \ } while(0) #define sorwakeup(so) do { \ if (sb_notify(&(so)->so_rcv)) \ sowakeup((so), &(so)->so_rcv); \ } while (0) #define sowwakeup(so) do { \ if (sb_notify(&(so)->so_snd)) \ sowakeup((so), &(so)->so_snd); \ } while (0) #ifdef _KERNEL /* * Argument structure for sosetopt et seq. This is in the KERNEL * section because it will never be visible to user code. */ enum sopt_dir { SOPT_GET, SOPT_SET }; struct sockopt { enum sopt_dir sopt_dir; /* is this a get or a set? */ int sopt_level; /* second arg of [gs]etsockopt */ int sopt_name; /* third arg of [gs]etsockopt */ void *sopt_val; /* fourth arg of [gs]etsockopt */ size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */ struct thread *sopt_td; /* calling thread or null if kernel */ }; struct sf_buf { SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */ struct vm_page *m; /* currently mapped page */ vm_offset_t kva; /* va of mapping */ }; struct accept_filter { char accf_name[16]; void (*accf_callback) (struct socket *so, void *arg, int waitflag); void * (*accf_create) (struct socket *so, char *arg); void (*accf_destroy) (struct socket *so); SLIST_ENTRY(accept_filter) accf_next; }; #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_ACCF); MALLOC_DECLARE(M_PCB); MALLOC_DECLARE(M_SONAME); #endif extern int maxsockets; extern u_long sb_max; extern struct uma_zone *socket_zone; extern so_gen_t so_gencnt; struct file; struct filedesc; struct knote; struct mbuf; struct sockaddr; struct stat; struct ucred; struct uio; /* * File operations on sockets. */ int soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td); int soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td); int soo_close(struct file *fp, struct thread *td); int soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, struct thread *td); int soo_poll(struct file *fp, int events, struct ucred *active_cred, struct thread *td); int soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, struct thread *td); int sokqfilter(struct file *fp, struct knote *kn); /* * From uipc_socket and friends */ struct sockaddr *dup_sockaddr(struct sockaddr *sa, int canwait); int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type); int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len); void sbappend(struct sockbuf *sb, struct mbuf *m); int sbappendaddr(struct sockbuf *sb, struct sockaddr *asa, struct mbuf *m0, struct mbuf *control); int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0, struct mbuf *control); void sbappendrecord(struct sockbuf *sb, struct mbuf *m0); void sbcheck(struct sockbuf *sb); void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n); struct mbuf * sbcreatecontrol(caddr_t p, int size, int type, int level); void sbdrop(struct sockbuf *sb, int len); void sbdroprecord(struct sockbuf *sb); void sbflush(struct sockbuf *sb); void sbinsertoob(struct sockbuf *sb, struct mbuf *m0); void sbrelease(struct sockbuf *sb, struct socket *so); int sbreserve(struct sockbuf *sb, u_long cc, struct socket *so, struct thread *td); void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb); int sbwait(struct sockbuf *sb); struct sf_buf * sf_buf_alloc(void); void sf_buf_free(void *addr, void *args); int sb_lock(struct sockbuf *sb); int soabort(struct socket *so); int soaccept(struct socket *so, struct sockaddr **nam); int socheckuid(struct socket *so, uid_t uid); struct socket *soalloc(int waitok); int sobind(struct socket *so, struct sockaddr *nam, struct thread *td); void socantrcvmore(struct socket *so); void socantsendmore(struct socket *so); int soclose(struct socket *so); int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td); int soconnect2(struct socket *so1, struct socket *so2); int socow_setup(struct mbuf *m0, struct uio *uio); int socreate(int dom, struct socket **aso, int type, int proto, struct ucred *cred, struct thread *td); int sodisconnect(struct socket *so); void sofree(struct socket *so); int sogetopt(struct socket *so, struct sockopt *sopt); void sohasoutofband(struct socket *so); void soisconnected(struct socket *so); void soisconnecting(struct socket *so); void soisdisconnected(struct socket *so); void soisdisconnecting(struct socket *so); int solisten(struct socket *so, int backlog, struct thread *td); struct socket * sonewconn(struct socket *head, int connstatus); int sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen); int sooptcopyout(struct sockopt *sopt, void *buf, size_t len); /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ int soopt_getm(struct sockopt *sopt, struct mbuf **mp); int soopt_mcopyin(struct sockopt *sopt, struct mbuf *m); int soopt_mcopyout(struct sockopt *sopt, struct mbuf *m); int sopoll(struct socket *so, int events, struct ucred *active_cred, struct thread *td); int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp); int soreserve(struct socket *so, u_long sndcc, u_long rcvcc); void sorflush(struct socket *so); int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, struct mbuf *top, struct mbuf *control, int flags, struct thread *td); int sosetopt(struct socket *so, struct sockopt *sopt); int soshutdown(struct socket *so, int how); void sotoxsocket(struct socket *so, struct xsocket *xso); void sowakeup(struct socket *so, struct sockbuf *sb); /* * Accept filter functions (duh). */ int accept_filt_add(struct accept_filter *filt); int accept_filt_del(char *name); struct accept_filter *accept_filt_get(char *name); #ifdef ACCEPT_FILTER_MOD #ifdef SYSCTL_DECL SYSCTL_DECL(_net_inet_accf); #endif int accept_filt_generic_mod_event(module_t mod, int event, void *data); #endif #endif /* _KERNEL */ #endif /* !_SYS_SOCKETVAR_H_ */