From c5a16c08ba69aef45a2ca3261fef82710c9fc396 Mon Sep 17 00:00:00 2001 From: rwatson Date: Mon, 24 Jul 2006 16:21:31 +0000 Subject: Remove non-socket buffer routines from uipc_sockbuf.c, and socket buffer specific routines from uipc_socket2.c following repo-copy. We might rethink the location of one or two at some point, but the division was relatively clean. uipc_sockbuf.c is now the home of routines that manipulate socket buffers. --- sys/kern/uipc_sockbuf.c | 362 +------------------ sys/kern/uipc_socket2.c | 925 +----------------------------------------------- 2 files changed, 8 insertions(+), 1279 deletions(-) diff --git a/sys/kern/uipc_sockbuf.c b/sys/kern/uipc_sockbuf.c index 14fd05a..e266272 100644 --- a/sys/kern/uipc_sockbuf.c +++ b/sys/kern/uipc_sockbuf.c @@ -36,13 +36,8 @@ __FBSDID("$FreeBSD$"); #include #include /* for aio_swake proto */ -#include -#include -#include -#include /* for maxfiles */ #include #include -#include #include #include #include @@ -51,14 +46,16 @@ __FBSDID("$FreeBSD$"); #include #include #include -#include #include -#include -void (*aio_swake)(struct socket *, struct sockbuf *); +/* + * Function pointer set by the AIO routines so that the socket buffer code + * can call back into the AIO module if it is loaded. + */ +void (*aio_swake)(struct socket *, struct sockbuf *); /* - * Primitive routines for operating on sockets and socket buffers + * Primitive routines for operating on socket buffers */ u_long sb_max = SB_MAX; @@ -68,130 +65,6 @@ static u_long sb_max_adj = static u_long sb_efficiency = 8; /* parameter for sbreserve() */ /* - * Procedures to manipulate state flags of socket - * and do appropriate wakeups. Normal sequence from the - * active (originating) side is that soisconnecting() is - * called during processing of connect() call, - * resulting in an eventual call to soisconnected() if/when the - * connection is established. When the connection is torn down - * soisdisconnecting() is called during processing of disconnect() call, - * and soisdisconnected() is called when the connection to the peer - * is totally severed. The semantics of these routines are such that - * connectionless protocols can call soisconnected() and soisdisconnected() - * only, bypassing the in-progress calls when setting up a ``connection'' - * takes no time. - * - * From the passive side, a socket is created with - * two queues of sockets: so_incomp for connections in progress - * and so_comp for connections already made and awaiting user acceptance. - * As a protocol is preparing incoming connections, it creates a socket - * structure queued on so_incomp by calling sonewconn(). When the connection - * is established, soisconnected() is called, and transfers the - * socket structure to so_comp, making it available to accept(). - * - * If a socket is closed with sockets on either - * so_incomp or so_comp, these sockets are dropped. - * - * If higher level protocols are implemented in - * the kernel, the wakeups done here will sometimes - * cause software-interrupt process scheduling. - */ - -void -soisconnecting(so) - register struct socket *so; -{ - - SOCK_LOCK(so); - so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING); - so->so_state |= SS_ISCONNECTING; - SOCK_UNLOCK(so); -} - -void -soisconnected(so) - struct socket *so; -{ - struct socket *head; - - ACCEPT_LOCK(); - SOCK_LOCK(so); - so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING); - so->so_state |= SS_ISCONNECTED; - head = so->so_head; - if (head != NULL && (so->so_qstate & SQ_INCOMP)) { - if ((so->so_options & SO_ACCEPTFILTER) == 0) { - SOCK_UNLOCK(so); - TAILQ_REMOVE(&head->so_incomp, so, so_list); - head->so_incqlen--; - so->so_qstate &= ~SQ_INCOMP; - TAILQ_INSERT_TAIL(&head->so_comp, so, so_list); - head->so_qlen++; - so->so_qstate |= SQ_COMP; - ACCEPT_UNLOCK(); - sorwakeup(head); - wakeup_one(&head->so_timeo); - } else { - ACCEPT_UNLOCK(); - so->so_upcall = - head->so_accf->so_accept_filter->accf_callback; - so->so_upcallarg = head->so_accf->so_accept_filter_arg; - so->so_rcv.sb_flags |= SB_UPCALL; - so->so_options &= ~SO_ACCEPTFILTER; - SOCK_UNLOCK(so); - so->so_upcall(so, so->so_upcallarg, M_DONTWAIT); - } - return; - } - SOCK_UNLOCK(so); - ACCEPT_UNLOCK(); - wakeup(&so->so_timeo); - sorwakeup(so); - sowwakeup(so); -} - -void -soisdisconnecting(so) - register struct socket *so; -{ - - /* - * XXXRW: This code assumes that SOCK_LOCK(so) and - * SOCKBUF_LOCK(&so->so_rcv) are the same. - */ - SOCKBUF_LOCK(&so->so_rcv); - so->so_state &= ~SS_ISCONNECTING; - so->so_state |= SS_ISDISCONNECTING; - so->so_rcv.sb_state |= SBS_CANTRCVMORE; - sorwakeup_locked(so); - SOCKBUF_LOCK(&so->so_snd); - so->so_snd.sb_state |= SBS_CANTSENDMORE; - sowwakeup_locked(so); - wakeup(&so->so_timeo); -} - -void -soisdisconnected(so) - register struct socket *so; -{ - - /* - * XXXRW: This code assumes that SOCK_LOCK(so) and - * SOCKBUF_LOCK(&so->so_rcv) are the same. - */ - SOCKBUF_LOCK(&so->so_rcv); - so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING); - so->so_state |= SS_ISDISCONNECTED; - so->so_rcv.sb_state |= SBS_CANTRCVMORE; - sorwakeup_locked(so); - SOCKBUF_LOCK(&so->so_snd); - so->so_snd.sb_state |= SBS_CANTSENDMORE; - sbdrop_locked(&so->so_snd, so->so_snd.sb_cc); - sowwakeup_locked(so); - wakeup(&so->so_timeo); -} - -/* * Socantsendmore indicates that no more data will be sent on the * socket; it would normally be applied to a socket when the user * informs the system that no more data is to be sent, by the protocol @@ -1090,231 +963,10 @@ sbdroprecord(sb) SOCKBUF_UNLOCK(sb); } -/* - * Create a "control" mbuf containing the specified data - * with the specified type for presentation on a socket buffer. - */ -struct mbuf * -sbcreatecontrol(p, size, type, level) - caddr_t p; - register int size; - int type, level; -{ - register struct cmsghdr *cp; - struct mbuf *m; - - if (CMSG_SPACE((u_int)size) > MCLBYTES) - return ((struct mbuf *) NULL); - if (CMSG_SPACE((u_int)size) > MLEN) - m = m_getcl(M_DONTWAIT, MT_CONTROL, 0); - else - m = m_get(M_DONTWAIT, MT_CONTROL); - if (m == NULL) - return ((struct mbuf *) NULL); - cp = mtod(m, struct cmsghdr *); - m->m_len = 0; - KASSERT(CMSG_SPACE((u_int)size) <= M_TRAILINGSPACE(m), - ("sbcreatecontrol: short mbuf")); - if (p != NULL) - (void)memcpy(CMSG_DATA(cp), p, size); - m->m_len = CMSG_SPACE(size); - cp->cmsg_len = CMSG_LEN(size); - cp->cmsg_level = level; - cp->cmsg_type = type; - return (m); -} - -/* - * Some routines that return EOPNOTSUPP for entry points that are not - * supported by a protocol. Fill in as needed. - */ -int -pru_accept_notsupp(struct socket *so, struct sockaddr **nam) -{ - return EOPNOTSUPP; -} - -int -pru_attach_notsupp(struct socket *so, int proto, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_connect2_notsupp(struct socket *so1, struct socket *so2) -{ - return EOPNOTSUPP; -} - -int -pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data, - struct ifnet *ifp, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_disconnect_notsupp(struct socket *so) -{ - return EOPNOTSUPP; -} - -int -pru_listen_notsupp(struct socket *so, int backlog, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam) -{ - return EOPNOTSUPP; -} - -int -pru_rcvd_notsupp(struct socket *so, int flags) -{ - return EOPNOTSUPP; -} - -int -pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags) -{ - return EOPNOTSUPP; -} - -int -pru_send_notsupp(struct socket *so, int flags, struct mbuf *m, - struct sockaddr *addr, struct mbuf *control, struct thread *td) -{ - return EOPNOTSUPP; -} - -/* - * This isn't really a ``null'' operation, but it's the default one - * and doesn't do anything destructive. - */ -int -pru_sense_null(struct socket *so, struct stat *sb) -{ - sb->st_blksize = so->so_snd.sb_hiwat; - return 0; -} - -int -pru_shutdown_notsupp(struct socket *so) -{ - return EOPNOTSUPP; -} - -int -pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam) -{ - return EOPNOTSUPP; -} - -int -pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio, - struct mbuf *top, struct mbuf *control, int flags, struct thread *td) -{ - return EOPNOTSUPP; -} - -int -pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr, - struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, - int *flagsp) -{ - return EOPNOTSUPP; -} - -int -pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred, - struct thread *td) -{ - return EOPNOTSUPP; -} - -/* - * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. - */ -struct sockaddr * -sodupsockaddr(const struct sockaddr *sa, int mflags) -{ - struct sockaddr *sa2; - - sa2 = malloc(sa->sa_len, M_SONAME, mflags); - if (sa2) - bcopy(sa, sa2, sa->sa_len); - return sa2; -} - -/* - * Create an external-format (``xsocket'') structure using the information - * in the kernel-format socket structure pointed to by so. This is done - * to reduce the spew of irrelevant information over this interface, - * to isolate user code from changes in the kernel structure, and - * potentially to provide information-hiding if we decide that - * some of this information should be hidden from users. - */ -void -sotoxsocket(struct socket *so, struct xsocket *xso) -{ - xso->xso_len = sizeof *xso; - xso->xso_so = so; - xso->so_type = so->so_type; - xso->so_options = so->so_options; - xso->so_linger = so->so_linger; - xso->so_state = so->so_state; - xso->so_pcb = so->so_pcb; - xso->xso_protocol = so->so_proto->pr_protocol; - xso->xso_family = so->so_proto->pr_domain->dom_family; - xso->so_qlen = so->so_qlen; - xso->so_incqlen = so->so_incqlen; - xso->so_qlimit = so->so_qlimit; - xso->so_timeo = so->so_timeo; - xso->so_error = so->so_error; - xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0; - xso->so_oobmark = so->so_oobmark; - sbtoxsockbuf(&so->so_snd, &xso->so_snd); - sbtoxsockbuf(&so->so_rcv, &xso->so_rcv); - xso->so_uid = so->so_cred->cr_uid; -} - -/* - * This does the same for sockbufs. Note that the xsockbuf structure, - * since it is always embedded in a socket, does not include a self - * pointer nor a length. We make this entry point public in case - * some other mechanism needs it. - */ -void -sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb) -{ - xsb->sb_cc = sb->sb_cc; - xsb->sb_hiwat = sb->sb_hiwat; - xsb->sb_mbcnt = sb->sb_mbcnt; - xsb->sb_mbmax = sb->sb_mbmax; - xsb->sb_lowat = sb->sb_lowat; - xsb->sb_flags = sb->sb_flags; - xsb->sb_timeo = sb->sb_timeo; -} - /* This takes the place of kern.maxsockbuf, which moved to kern.ipc. */ static int dummy; SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, ""); -SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_ULONG|CTLFLAG_RW, +SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_ULONG|CTLFLAG_RW, &sb_max, 0, sysctl_handle_sb_max, "LU", "Maximum socket buffer size"); SYSCTL_ULONG(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW, &sb_efficiency, 0, ""); diff --git a/sys/kern/uipc_socket2.c b/sys/kern/uipc_socket2.c index 14fd05a..1f2a923 100644 --- a/sys/kern/uipc_socket2.c +++ b/sys/kern/uipc_socket2.c @@ -35,12 +35,7 @@ __FBSDID("$FreeBSD$"); #include "opt_param.h" #include -#include /* for aio_swake proto */ #include -#include -#include -#include /* for maxfiles */ -#include #include #include #include @@ -48,25 +43,14 @@ __FBSDID("$FreeBSD$"); #include #include #include -#include #include #include #include -#include -#include - -void (*aio_swake)(struct socket *, struct sockbuf *); /* - * Primitive routines for operating on sockets and socket buffers + * Primitive routines for operating on sockets. */ -u_long sb_max = SB_MAX; -static u_long sb_max_adj = - SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */ - -static u_long sb_efficiency = 8; /* parameter for sbreserve() */ - /* * Procedures to manipulate state flags of socket * and do appropriate wakeups. Normal sequence from the @@ -192,905 +176,6 @@ soisdisconnected(so) } /* - * Socantsendmore indicates that no more data will be sent on the - * socket; it would normally be applied to a socket when the user - * informs the system that no more data is to be sent, by the protocol - * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data - * will be received, and will normally be applied to the socket by a - * protocol when it detects that the peer will send no more data. - * Data queued for reading in the socket may yet be read. - */ -void -socantsendmore_locked(so) - struct socket *so; -{ - - SOCKBUF_LOCK_ASSERT(&so->so_snd); - - so->so_snd.sb_state |= SBS_CANTSENDMORE; - sowwakeup_locked(so); - mtx_assert(SOCKBUF_MTX(&so->so_snd), MA_NOTOWNED); -} - -void -socantsendmore(so) - struct socket *so; -{ - - SOCKBUF_LOCK(&so->so_snd); - socantsendmore_locked(so); - mtx_assert(SOCKBUF_MTX(&so->so_snd), MA_NOTOWNED); -} - -void -socantrcvmore_locked(so) - struct socket *so; -{ - - SOCKBUF_LOCK_ASSERT(&so->so_rcv); - - so->so_rcv.sb_state |= SBS_CANTRCVMORE; - sorwakeup_locked(so); - mtx_assert(SOCKBUF_MTX(&so->so_rcv), MA_NOTOWNED); -} - -void -socantrcvmore(so) - struct socket *so; -{ - - SOCKBUF_LOCK(&so->so_rcv); - socantrcvmore_locked(so); - mtx_assert(SOCKBUF_MTX(&so->so_rcv), MA_NOTOWNED); -} - -/* - * Wait for data to arrive at/drain from a socket buffer. - */ -int -sbwait(sb) - struct sockbuf *sb; -{ - - SOCKBUF_LOCK_ASSERT(sb); - - sb->sb_flags |= SB_WAIT; - return (msleep(&sb->sb_cc, &sb->sb_mtx, - (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait", - sb->sb_timeo)); -} - -/* - * Lock a sockbuf already known to be locked; - * return any error returned from sleep (EINTR). - */ -int -sb_lock(sb) - register struct sockbuf *sb; -{ - int error; - - SOCKBUF_LOCK_ASSERT(sb); - - while (sb->sb_flags & SB_LOCK) { - sb->sb_flags |= SB_WANT; - error = msleep(&sb->sb_flags, &sb->sb_mtx, - (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK|PCATCH, - "sblock", 0); - if (error) - return (error); - } - sb->sb_flags |= SB_LOCK; - return (0); -} - -/* - * Wakeup processes waiting on a socket buffer. Do asynchronous - * notification via SIGIO if the socket has the SS_ASYNC flag set. - * - * Called with the socket buffer lock held; will release the lock by the end - * of the function. This allows the caller to acquire the socket buffer lock - * while testing for the need for various sorts of wakeup and hold it through - * to the point where it's no longer required. We currently hold the lock - * through calls out to other subsystems (with the exception of kqueue), and - * then release it to avoid lock order issues. It's not clear that's - * correct. - */ -void -sowakeup(so, sb) - register struct socket *so; - register struct sockbuf *sb; -{ - - SOCKBUF_LOCK_ASSERT(sb); - - selwakeuppri(&sb->sb_sel, PSOCK); - sb->sb_flags &= ~SB_SEL; - if (sb->sb_flags & SB_WAIT) { - sb->sb_flags &= ~SB_WAIT; - wakeup(&sb->sb_cc); - } - KNOTE_LOCKED(&sb->sb_sel.si_note, 0); - SOCKBUF_UNLOCK(sb); - if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL) - pgsigio(&so->so_sigio, SIGIO, 0); - if (sb->sb_flags & SB_UPCALL) - (*so->so_upcall)(so, so->so_upcallarg, M_DONTWAIT); - if (sb->sb_flags & SB_AIO) - aio_swake(so, sb); - mtx_assert(SOCKBUF_MTX(sb), MA_NOTOWNED); -} - -/* - * Socket buffer (struct sockbuf) utility routines. - * - * Each socket contains two socket buffers: one for sending data and - * one for receiving data. Each buffer contains a queue of mbufs, - * information about the number of mbufs and amount of data in the - * queue, and other fields allowing select() statements and notification - * on data availability to be implemented. - * - * Data stored in a socket buffer is maintained as a list of records. - * Each record is a list of mbufs chained together with the m_next - * field. Records are chained together with the m_nextpkt field. The upper - * level routine soreceive() expects the following conventions to be - * observed when placing information in the receive buffer: - * - * 1. If the protocol requires each message be preceded by the sender's - * name, then a record containing that name must be present before - * any associated data (mbuf's must be of type MT_SONAME). - * 2. If the protocol supports the exchange of ``access rights'' (really - * just additional data associated with the message), and there are - * ``rights'' to be received, then a record containing this data - * should be present (mbuf's must be of type MT_RIGHTS). - * 3. If a name or rights record exists, then it must be followed by - * a data record, perhaps of zero length. - * - * Before using a new socket structure it is first necessary to reserve - * buffer space to the socket, by calling sbreserve(). This should commit - * some of the available buffer space in the system buffer pool for the - * socket (currently, it does nothing but enforce limits). The space - * should be released by calling sbrelease() when the socket is destroyed. - */ - -int -soreserve(so, sndcc, rcvcc) - register struct socket *so; - u_long sndcc, rcvcc; -{ - struct thread *td = curthread; - - SOCKBUF_LOCK(&so->so_snd); - SOCKBUF_LOCK(&so->so_rcv); - if (sbreserve_locked(&so->so_snd, sndcc, so, td) == 0) - goto bad; - if (sbreserve_locked(&so->so_rcv, rcvcc, so, td) == 0) - goto bad2; - if (so->so_rcv.sb_lowat == 0) - so->so_rcv.sb_lowat = 1; - if (so->so_snd.sb_lowat == 0) - so->so_snd.sb_lowat = MCLBYTES; - if (so->so_snd.sb_lowat > so->so_snd.sb_hiwat) - so->so_snd.sb_lowat = so->so_snd.sb_hiwat; - SOCKBUF_UNLOCK(&so->so_rcv); - SOCKBUF_UNLOCK(&so->so_snd); - return (0); -bad2: - sbrelease_locked(&so->so_snd, so); -bad: - SOCKBUF_UNLOCK(&so->so_rcv); - SOCKBUF_UNLOCK(&so->so_snd); - return (ENOBUFS); -} - -static int -sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS) -{ - int error = 0; - u_long old_sb_max = sb_max; - - error = SYSCTL_OUT(req, arg1, sizeof(u_long)); - if (error || !req->newptr) - return (error); - error = SYSCTL_IN(req, arg1, sizeof(u_long)); - if (error) - return (error); - if (sb_max < MSIZE + MCLBYTES) { - sb_max = old_sb_max; - return (EINVAL); - } - sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES); - return (0); -} - -/* - * Allot mbufs to a sockbuf. - * Attempt to scale mbmax so that mbcnt doesn't become limiting - * if buffering efficiency is near the normal case. - */ -int -sbreserve_locked(sb, cc, so, td) - struct sockbuf *sb; - u_long cc; - struct socket *so; - struct thread *td; -{ - rlim_t sbsize_limit; - - SOCKBUF_LOCK_ASSERT(sb); - - /* - * td will only be NULL when we're in an interrupt - * (e.g. in tcp_input()) - */ - if (cc > sb_max_adj) - return (0); - if (td != NULL) { - PROC_LOCK(td->td_proc); - sbsize_limit = lim_cur(td->td_proc, RLIMIT_SBSIZE); - PROC_UNLOCK(td->td_proc); - } else - sbsize_limit = RLIM_INFINITY; - if (!chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, cc, - sbsize_limit)) - return (0); - sb->sb_mbmax = min(cc * sb_efficiency, sb_max); - if (sb->sb_lowat > sb->sb_hiwat) - sb->sb_lowat = sb->sb_hiwat; - return (1); -} - -int -sbreserve(sb, cc, so, td) - struct sockbuf *sb; - u_long cc; - struct socket *so; - struct thread *td; -{ - int error; - - SOCKBUF_LOCK(sb); - error = sbreserve_locked(sb, cc, so, td); - SOCKBUF_UNLOCK(sb); - return (error); -} - -/* - * Free mbufs held by a socket, and reserved mbuf space. - */ -void -sbrelease_locked(sb, so) - struct sockbuf *sb; - struct socket *so; -{ - - SOCKBUF_LOCK_ASSERT(sb); - - sbflush_locked(sb); - (void)chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, 0, - RLIM_INFINITY); - sb->sb_mbmax = 0; -} - -void -sbrelease(sb, so) - struct sockbuf *sb; - struct socket *so; -{ - - SOCKBUF_LOCK(sb); - sbrelease_locked(sb, so); - SOCKBUF_UNLOCK(sb); -} -/* - * Routines to add and remove - * data from an mbuf queue. - * - * The routines sbappend() or sbappendrecord() are normally called to - * append new mbufs to a socket buffer, after checking that adequate - * space is available, comparing the function sbspace() with the amount - * of data to be added. sbappendrecord() differs from sbappend() in - * that data supplied is treated as the beginning of a new record. - * To place a sender's address, optional access rights, and data in a - * socket receive buffer, sbappendaddr() should be used. To place - * access rights and data in a socket receive buffer, sbappendrights() - * should be used. In either case, the new data begins a new record. - * Note that unlike sbappend() and sbappendrecord(), these routines check - * for the caller that there will be enough space to store the data. - * Each fails if there is not enough space, or if it cannot find mbufs - * to store additional information in. - * - * Reliable protocols may use the socket send buffer to hold data - * awaiting acknowledgement. Data is normally copied from a socket - * send buffer in a protocol with m_copy for output to a peer, - * and then removing the data from the socket buffer with sbdrop() - * or sbdroprecord() when the data is acknowledged by the peer. - */ - -#ifdef SOCKBUF_DEBUG -void -sblastrecordchk(struct sockbuf *sb, const char *file, int line) -{ - struct mbuf *m = sb->sb_mb; - - SOCKBUF_LOCK_ASSERT(sb); - - while (m && m->m_nextpkt) - m = m->m_nextpkt; - - if (m != sb->sb_lastrecord) { - printf("%s: sb_mb %p sb_lastrecord %p last %p\n", - __func__, sb->sb_mb, sb->sb_lastrecord, m); - printf("packet chain:\n"); - for (m = sb->sb_mb; m != NULL; m = m->m_nextpkt) - printf("\t%p\n", m); - panic("%s from %s:%u", __func__, file, line); - } -} - -void -sblastmbufchk(struct sockbuf *sb, const char *file, int line) -{ - struct mbuf *m = sb->sb_mb; - struct mbuf *n; - - SOCKBUF_LOCK_ASSERT(sb); - - while (m && m->m_nextpkt) - m = m->m_nextpkt; - - while (m && m->m_next) - m = m->m_next; - - if (m != sb->sb_mbtail) { - printf("%s: sb_mb %p sb_mbtail %p last %p\n", - __func__, sb->sb_mb, sb->sb_mbtail, m); - printf("packet tree:\n"); - for (m = sb->sb_mb; m != NULL; m = m->m_nextpkt) { - printf("\t"); - for (n = m; n != NULL; n = n->m_next) - printf("%p ", n); - printf("\n"); - } - panic("%s from %s:%u", __func__, file, line); - } -} -#endif /* SOCKBUF_DEBUG */ - -#define SBLINKRECORD(sb, m0) do { \ - SOCKBUF_LOCK_ASSERT(sb); \ - if ((sb)->sb_lastrecord != NULL) \ - (sb)->sb_lastrecord->m_nextpkt = (m0); \ - else \ - (sb)->sb_mb = (m0); \ - (sb)->sb_lastrecord = (m0); \ -} while (/*CONSTCOND*/0) - -/* - * Append mbuf chain m to the last record in the - * socket buffer sb. The additional space associated - * the mbuf chain is recorded in sb. Empty mbufs are - * discarded and mbufs are compacted where possible. - */ -void -sbappend_locked(sb, m) - struct sockbuf *sb; - struct mbuf *m; -{ - register struct mbuf *n; - - SOCKBUF_LOCK_ASSERT(sb); - - if (m == 0) - return; - - SBLASTRECORDCHK(sb); - n = sb->sb_mb; - if (n) { - while (n->m_nextpkt) - n = n->m_nextpkt; - do { - if (n->m_flags & M_EOR) { - sbappendrecord_locked(sb, m); /* XXXXXX!!!! */ - return; - } - } while (n->m_next && (n = n->m_next)); - } else { - /* - * XXX Would like to simply use sb_mbtail here, but - * XXX I need to verify that I won't miss an EOR that - * XXX way. - */ - if ((n = sb->sb_lastrecord) != NULL) { - do { - if (n->m_flags & M_EOR) { - sbappendrecord_locked(sb, m); /* XXXXXX!!!! */ - return; - } - } while (n->m_next && (n = n->m_next)); - } else { - /* - * If this is the first record in the socket buffer, - * it's also the last record. - */ - sb->sb_lastrecord = m; - } - } - sbcompress(sb, m, n); - SBLASTRECORDCHK(sb); -} - -/* - * Append mbuf chain m to the last record in the - * socket buffer sb. The additional space associated - * the mbuf chain is recorded in sb. Empty mbufs are - * discarded and mbufs are compacted where possible. - */ -void -sbappend(sb, m) - struct sockbuf *sb; - struct mbuf *m; -{ - - SOCKBUF_LOCK(sb); - sbappend_locked(sb, m); - SOCKBUF_UNLOCK(sb); -} - -/* - * This version of sbappend() should only be used when the caller - * absolutely knows that there will never be more than one record - * in the socket buffer, that is, a stream protocol (such as TCP). - */ -void -sbappendstream_locked(struct sockbuf *sb, struct mbuf *m) -{ - SOCKBUF_LOCK_ASSERT(sb); - - KASSERT(m->m_nextpkt == NULL,("sbappendstream 0")); - KASSERT(sb->sb_mb == sb->sb_lastrecord,("sbappendstream 1")); - - SBLASTMBUFCHK(sb); - - sbcompress(sb, m, sb->sb_mbtail); - - sb->sb_lastrecord = sb->sb_mb; - SBLASTRECORDCHK(sb); -} - -/* - * This version of sbappend() should only be used when the caller - * absolutely knows that there will never be more than one record - * in the socket buffer, that is, a stream protocol (such as TCP). - */ -void -sbappendstream(struct sockbuf *sb, struct mbuf *m) -{ - - SOCKBUF_LOCK(sb); - sbappendstream_locked(sb, m); - SOCKBUF_UNLOCK(sb); -} - -#ifdef SOCKBUF_DEBUG -void -sbcheck(sb) - struct sockbuf *sb; -{ - struct mbuf *m; - struct mbuf *n = 0; - u_long len = 0, mbcnt = 0; - - SOCKBUF_LOCK_ASSERT(sb); - - for (m = sb->sb_mb; m; m = n) { - n = m->m_nextpkt; - for (; m; m = m->m_next) { - len += m->m_len; - mbcnt += MSIZE; - if (m->m_flags & M_EXT) /*XXX*/ /* pretty sure this is bogus */ - mbcnt += m->m_ext.ext_size; - } - } - if (len != sb->sb_cc || mbcnt != sb->sb_mbcnt) { - printf("cc %ld != %u || mbcnt %ld != %u\n", len, sb->sb_cc, - mbcnt, sb->sb_mbcnt); - panic("sbcheck"); - } -} -#endif - -/* - * As above, except the mbuf chain - * begins a new record. - */ -void -sbappendrecord_locked(sb, m0) - register struct sockbuf *sb; - register struct mbuf *m0; -{ - register struct mbuf *m; - - SOCKBUF_LOCK_ASSERT(sb); - - if (m0 == 0) - return; - m = sb->sb_mb; - if (m) - while (m->m_nextpkt) - m = m->m_nextpkt; - /* - * Put the first mbuf on the queue. - * Note this permits zero length records. - */ - sballoc(sb, m0); - SBLASTRECORDCHK(sb); - SBLINKRECORD(sb, m0); - if (m) - m->m_nextpkt = m0; - else - sb->sb_mb = m0; - m = m0->m_next; - m0->m_next = 0; - if (m && (m0->m_flags & M_EOR)) { - m0->m_flags &= ~M_EOR; - m->m_flags |= M_EOR; - } - sbcompress(sb, m, m0); -} - -/* - * As above, except the mbuf chain - * begins a new record. - */ -void -sbappendrecord(sb, m0) - register struct sockbuf *sb; - register struct mbuf *m0; -{ - - SOCKBUF_LOCK(sb); - sbappendrecord_locked(sb, m0); - SOCKBUF_UNLOCK(sb); -} - -/* - * Append address and data, and optionally, control (ancillary) data - * to the receive queue of a socket. If present, - * m0 must include a packet header with total length. - * Returns 0 if no space in sockbuf or insufficient mbufs. - */ -int -sbappendaddr_locked(sb, asa, m0, control) - struct sockbuf *sb; - const struct sockaddr *asa; - struct mbuf *m0, *control; -{ - struct mbuf *m, *n, *nlast; - int space = asa->sa_len; - - SOCKBUF_LOCK_ASSERT(sb); - - if (m0 && (m0->m_flags & M_PKTHDR) == 0) - panic("sbappendaddr_locked"); - if (m0) - space += m0->m_pkthdr.len; - space += m_length(control, &n); - - if (space > sbspace(sb)) - return (0); -#if MSIZE <= 256 - if (asa->sa_len > MLEN) - return (0); -#endif - MGET(m, M_DONTWAIT, MT_SONAME); - if (m == 0) - return (0); - m->m_len = asa->sa_len; - bcopy(asa, mtod(m, caddr_t), asa->sa_len); - if (n) - n->m_next = m0; /* concatenate data to control */ - else - control = m0; - m->m_next = control; - for (n = m; n->m_next != NULL; n = n->m_next) - sballoc(sb, n); - sballoc(sb, n); - nlast = n; - SBLINKRECORD(sb, m); - - sb->sb_mbtail = nlast; - SBLASTMBUFCHK(sb); - - SBLASTRECORDCHK(sb); - return (1); -} - -/* - * Append address and data, and optionally, control (ancillary) data - * to the receive queue of a socket. If present, - * m0 must include a packet header with total length. - * Returns 0 if no space in sockbuf or insufficient mbufs. - */ -int -sbappendaddr(sb, asa, m0, control) - struct sockbuf *sb; - const struct sockaddr *asa; - struct mbuf *m0, *control; -{ - int retval; - - SOCKBUF_LOCK(sb); - retval = sbappendaddr_locked(sb, asa, m0, control); - SOCKBUF_UNLOCK(sb); - return (retval); -} - -int -sbappendcontrol_locked(sb, m0, control) - struct sockbuf *sb; - struct mbuf *control, *m0; -{ - struct mbuf *m, *n, *mlast; - int space; - - SOCKBUF_LOCK_ASSERT(sb); - - if (control == 0) - panic("sbappendcontrol_locked"); - space = m_length(control, &n) + m_length(m0, NULL); - - if (space > sbspace(sb)) - return (0); - n->m_next = m0; /* concatenate data to control */ - - SBLASTRECORDCHK(sb); - - for (m = control; m->m_next; m = m->m_next) - sballoc(sb, m); - sballoc(sb, m); - mlast = m; - SBLINKRECORD(sb, control); - - sb->sb_mbtail = mlast; - SBLASTMBUFCHK(sb); - - SBLASTRECORDCHK(sb); - return (1); -} - -int -sbappendcontrol(sb, m0, control) - struct sockbuf *sb; - struct mbuf *control, *m0; -{ - int retval; - - SOCKBUF_LOCK(sb); - retval = sbappendcontrol_locked(sb, m0, control); - SOCKBUF_UNLOCK(sb); - return (retval); -} - -/* - * Append the data in mbuf chain (m) into the socket buffer sb following mbuf - * (n). If (n) is NULL, the buffer is presumed empty. - * - * When the data is compressed, mbufs in the chain may be handled in one of - * three ways: - * - * (1) The mbuf may simply be dropped, if it contributes nothing (no data, no - * record boundary, and no change in data type). - * - * (2) The mbuf may be coalesced -- i.e., data in the mbuf may be copied into - * an mbuf already in the socket buffer. This can occur if an - * appropriate mbuf exists, there is room, and no merging of data types - * will occur. - * - * (3) The mbuf may be appended to the end of the existing mbuf chain. - * - * If any of the new mbufs is marked as M_EOR, mark the last mbuf appended as - * end-of-record. - */ -void -sbcompress(sb, m, n) - register struct sockbuf *sb; - register struct mbuf *m, *n; -{ - register int eor = 0; - register struct mbuf *o; - - SOCKBUF_LOCK_ASSERT(sb); - - while (m) { - eor |= m->m_flags & M_EOR; - if (m->m_len == 0 && - (eor == 0 || - (((o = m->m_next) || (o = n)) && - o->m_type == m->m_type))) { - if (sb->sb_lastrecord == m) - sb->sb_lastrecord = m->m_next; - m = m_free(m); - continue; - } - if (n && (n->m_flags & M_EOR) == 0 && - M_WRITABLE(n) && - m->m_len <= MCLBYTES / 4 && /* XXX: Don't copy too much */ - m->m_len <= M_TRAILINGSPACE(n) && - n->m_type == m->m_type) { - bcopy(mtod(m, caddr_t), mtod(n, caddr_t) + n->m_len, - (unsigned)m->m_len); - n->m_len += m->m_len; - sb->sb_cc += m->m_len; - if (m->m_type != MT_DATA && m->m_type != MT_OOBDATA) - /* XXX: Probably don't need.*/ - sb->sb_ctl += m->m_len; - m = m_free(m); - continue; - } - if (n) - n->m_next = m; - else - sb->sb_mb = m; - sb->sb_mbtail = m; - sballoc(sb, m); - n = m; - m->m_flags &= ~M_EOR; - m = m->m_next; - n->m_next = 0; - } - if (eor) { - KASSERT(n != NULL, ("sbcompress: eor && n == NULL")); - n->m_flags |= eor; - } - SBLASTMBUFCHK(sb); -} - -/* - * Free all mbufs in a sockbuf. - * Check that all resources are reclaimed. - */ -void -sbflush_locked(sb) - register struct sockbuf *sb; -{ - - SOCKBUF_LOCK_ASSERT(sb); - - if (sb->sb_flags & SB_LOCK) - panic("sbflush_locked: locked"); - while (sb->sb_mbcnt) { - /* - * Don't call sbdrop(sb, 0) if the leading mbuf is non-empty: - * we would loop forever. Panic instead. - */ - if (!sb->sb_cc && (sb->sb_mb == NULL || sb->sb_mb->m_len)) - break; - sbdrop_locked(sb, (int)sb->sb_cc); - } - if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt) - panic("sbflush_locked: cc %u || mb %p || mbcnt %u", sb->sb_cc, (void *)sb->sb_mb, sb->sb_mbcnt); -} - -void -sbflush(sb) - register struct sockbuf *sb; -{ - - SOCKBUF_LOCK(sb); - sbflush_locked(sb); - SOCKBUF_UNLOCK(sb); -} - -/* - * Drop data from (the front of) a sockbuf. - */ -void -sbdrop_locked(sb, len) - register struct sockbuf *sb; - register int len; -{ - register struct mbuf *m; - struct mbuf *next; - - SOCKBUF_LOCK_ASSERT(sb); - - next = (m = sb->sb_mb) ? m->m_nextpkt : 0; - while (len > 0) { - if (m == 0) { - if (next == 0) - panic("sbdrop"); - m = next; - next = m->m_nextpkt; - continue; - } - if (m->m_len > len) { - m->m_len -= len; - m->m_data += len; - sb->sb_cc -= len; - if (m->m_type != MT_DATA && m->m_type != MT_OOBDATA) - sb->sb_ctl -= len; - break; - } - len -= m->m_len; - sbfree(sb, m); - m = m_free(m); - } - while (m && m->m_len == 0) { - sbfree(sb, m); - m = m_free(m); - } - if (m) { - sb->sb_mb = m; - m->m_nextpkt = next; - } else - sb->sb_mb = next; - /* - * First part is an inline SB_EMPTY_FIXUP(). Second part - * makes sure sb_lastrecord is up-to-date if we dropped - * part of the last record. - */ - m = sb->sb_mb; - if (m == NULL) { - sb->sb_mbtail = NULL; - sb->sb_lastrecord = NULL; - } else if (m->m_nextpkt == NULL) { - sb->sb_lastrecord = m; - } -} - -/* - * Drop data from (the front of) a sockbuf. - */ -void -sbdrop(sb, len) - register struct sockbuf *sb; - register int len; -{ - - SOCKBUF_LOCK(sb); - sbdrop_locked(sb, len); - SOCKBUF_UNLOCK(sb); -} - -/* - * Drop a record off the front of a sockbuf - * and move the next record to the front. - */ -void -sbdroprecord_locked(sb) - register struct sockbuf *sb; -{ - register struct mbuf *m; - - SOCKBUF_LOCK_ASSERT(sb); - - m = sb->sb_mb; - if (m) { - sb->sb_mb = m->m_nextpkt; - do { - sbfree(sb, m); - m = m_free(m); - } while (m); - } - SB_EMPTY_FIXUP(sb); -} - -/* - * Drop a record off the front of a sockbuf - * and move the next record to the front. - */ -void -sbdroprecord(sb) - register struct sockbuf *sb; -{ - - SOCKBUF_LOCK(sb); - sbdroprecord_locked(sb); - SOCKBUF_UNLOCK(sb); -} - -/* * Create a "control" mbuf containing the specified data * with the specified type for presentation on a socket buffer. */ @@ -1310,11 +395,3 @@ sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb) xsb->sb_flags = sb->sb_flags; xsb->sb_timeo = sb->sb_timeo; } - -/* This takes the place of kern.maxsockbuf, which moved to kern.ipc. */ -static int dummy; -SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, ""); -SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_ULONG|CTLFLAG_RW, - &sb_max, 0, sysctl_handle_sb_max, "LU", "Maximum socket buffer size"); -SYSCTL_ULONG(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW, - &sb_efficiency, 0, ""); -- cgit v1.1