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38 * Author: Archie Cobbs <archie@freebsd.org>
40 * Updated by Andrew Thompson <thompsa@FreeBSD.org> for MPSAFE TTY.
41 * $Whistle: ng_tty.c,v 1.21 1999/11/01 09:24:52 julian Exp $
45 * This file implements TTY hooks to link in to the netgraph system. The node
46 * is created and then passed the callers opened TTY file descriptor number to
47 * NGM_TTY_SET_TTY, this will hook the tty via ttyhook_register().
49 * Incoming data is delivered directly to ng_tty via the TTY bypass hook as a
50 * buffer pointer and length, this is converted to a mbuf and passed to the
53 * If the TTY device does not support bypass then incoming characters are
54 * delivered to the hook one at a time, each in its own mbuf. You may
55 * optionally define a ``hotchar,'' which causes incoming characters to be
56 * buffered up until either the hotchar is seen or the mbuf is full (MHLEN
57 * bytes). Then all buffered characters are immediately delivered.
60 #include <sys/param.h>
61 #include <sys/systm.h>
63 #include <sys/errno.h>
64 #include <sys/fcntl.h>
65 #include <sys/ioccom.h>
66 #include <sys/kernel.h>
67 #include <sys/malloc.h>
70 #include <sys/socket.h>
71 #include <sys/syslog.h>
73 #include <sys/ttycom.h>
77 #include <net/if_var.h>
79 #include <netgraph/ng_message.h>
80 #include <netgraph/netgraph.h>
81 #include <netgraph/ng_tty.h>
83 /* Per-node private info */
85 struct tty *tp; /* Terminal device */
86 node_p node; /* Netgraph node */
87 hook_p hook; /* Netgraph hook */
88 struct ifqueue outq; /* Queue of outgoing data */
89 size_t outqlen; /* Number of bytes in outq */
90 struct mbuf *m; /* Incoming non-bypass data buffer */
91 short hotchar; /* Hotchar, or -1 if none */
92 u_int flags; /* Flags */
94 typedef struct ngt_softc *sc_p;
97 #define FLG_DEBUG 0x0002
99 /* Netgraph methods */
100 static ng_constructor_t ngt_constructor;
101 static ng_rcvmsg_t ngt_rcvmsg;
102 static ng_shutdown_t ngt_shutdown;
103 static ng_newhook_t ngt_newhook;
104 static ng_connect_t ngt_connect;
105 static ng_rcvdata_t ngt_rcvdata;
106 static ng_disconnect_t ngt_disconnect;
108 #define ERROUT(x) do { error = (x); goto done; } while (0)
110 static th_getc_inject_t ngt_getc_inject;
111 static th_getc_poll_t ngt_getc_poll;
112 static th_rint_t ngt_rint;
113 static th_rint_bypass_t ngt_rint_bypass;
114 static th_rint_poll_t ngt_rint_poll;
116 static struct ttyhook ngt_hook = {
117 .th_getc_inject = ngt_getc_inject,
118 .th_getc_poll = ngt_getc_poll,
120 .th_rint_bypass = ngt_rint_bypass,
121 .th_rint_poll = ngt_rint_poll,
124 /* Netgraph node type descriptor */
125 static struct ng_type typestruct = {
126 .version = NG_ABI_VERSION,
127 .name = NG_TTY_NODE_TYPE,
128 .constructor = ngt_constructor,
129 .rcvmsg = ngt_rcvmsg,
130 .shutdown = ngt_shutdown,
131 .newhook = ngt_newhook,
132 .connect = ngt_connect,
133 .rcvdata = ngt_rcvdata,
134 .disconnect = ngt_disconnect,
136 NETGRAPH_INIT(tty, &typestruct);
138 #define NGTLOCK(sc) IF_LOCK(&sc->outq)
139 #define NGTUNLOCK(sc) IF_UNLOCK(&sc->outq)
141 /******************************************************************
142 NETGRAPH NODE METHODS
143 ******************************************************************/
146 * Initialize a new node of this type.
148 * We only allow nodes to be created as a result of setting
149 * the line discipline on a tty, so always return an error if not.
152 ngt_constructor(node_p node)
156 /* Allocate private structure */
157 sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
159 NG_NODE_SET_PRIVATE(node, sc);
162 mtx_init(&sc->outq.ifq_mtx, "ng_tty node+queue", NULL, MTX_DEF);
163 IFQ_SET_MAXLEN(&sc->outq, ifqmaxlen);
169 * Add a new hook. There can only be one.
172 ngt_newhook(node_p node, hook_p hook, const char *name)
174 const sc_p sc = NG_NODE_PRIVATE(node);
176 if (strcmp(name, NG_TTY_HOOK))
190 * Set the hook into queueing mode (for outgoing packets),
191 * so that we wont deliver mbuf through the whole graph holding
195 ngt_connect(hook_p hook)
197 NG_HOOK_FORCE_QUEUE(hook);
202 * Disconnect the hook
205 ngt_disconnect(hook_p hook)
207 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
209 if (hook != sc->hook)
210 panic("%s", __func__);
220 * Remove this node. The does the netgraph portion of the shutdown.
223 ngt_shutdown(node_p node)
225 const sc_p sc = NG_NODE_PRIVATE(node);
231 ttyhook_unregister(tp);
235 mtx_destroy(&(sc)->outq.ifq_mtx);
236 NG_NODE_UNREF(sc->node);
237 free(sc, M_NETGRAPH);
243 * Receive control message
246 ngt_rcvmsg(node_p node, item_p item, hook_p lasthook)
249 const sc_p sc = NG_NODE_PRIVATE(node);
250 struct ng_mesg *msg, *resp = NULL;
253 NGI_GET_MSG(item, msg);
254 switch (msg->header.typecookie) {
256 switch (msg->header.cmd) {
257 case NGM_TTY_SET_TTY:
261 p = pfind(((int *)msg->data)[0]);
262 if (p == NULL || (p->p_flag & P_WEXIT))
266 error = ttyhook_register(&sc->tp, p, ((int *)msg->data)[1],
272 case NGM_TTY_SET_HOTCHAR:
276 if (msg->header.arglen != sizeof(int))
278 hotchar = *((int *) msg->data);
279 if (hotchar != (u_char) hotchar && hotchar != -1)
281 sc->hotchar = hotchar; /* race condition is OK */
284 case NGM_TTY_GET_HOTCHAR:
285 NG_MKRESPONSE(resp, msg, sizeof(int), M_NOWAIT);
288 /* Race condition here is OK */
289 *((int *) resp->data) = sc->hotchar;
299 NG_RESPOND_MSG(error, node, item, resp);
305 * Receive incoming data from netgraph system. Put it on our
306 * output queue and start output if necessary.
309 ngt_rcvdata(hook_p hook, item_p item)
311 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
312 struct tty *tp = sc->tp;
315 if (hook != sc->hook)
316 panic("%s", __func__);
327 if (_IF_QFULL(&sc->outq)) {
328 IF_UNLOCK(&sc->outq);
333 _IF_ENQUEUE(&sc->outq, m);
334 sc->outqlen += m->m_pkthdr.len;
335 IF_UNLOCK(&sc->outq);
337 /* notify the TTY that data is ready */
340 ttydevsw_outwakeup(tp);
347 ngt_getc_inject(struct tty *tp, void *buf, size_t len)
349 sc_p sc = ttyhook_softc(tp);
356 /* Remove first mbuf from queue */
357 IF_DEQUEUE(&sc->outq, m);
361 /* Send as much of it as possible */
363 length = min(m->m_len, len);
364 memcpy((char *)buf + total, mtod(m, char *), length);
372 break; /* device can't take any more */
376 /* Put remainder of mbuf chain (if any) back on queue */
378 IF_PREPEND(&sc->outq, m);
383 sc->outqlen -= total;
384 IF_UNLOCK(&sc->outq);
385 MPASS(sc->outqlen >= 0);
391 ngt_getc_poll(struct tty *tp)
393 sc_p sc = ttyhook_softc(tp);
395 return (sc->outqlen);
399 * Optimised TTY input.
401 * We get a buffer pointer to hopefully a complete data frame. Do not check for
402 * the hotchar, just pass it on.
405 ngt_rint_bypass(struct tty *tp, const void *buf, size_t len)
407 sc_p sc = ttyhook_softc(tp);
408 node_p node = sc->node;
411 int error = 0, length;
413 tty_assert_locked(tp);
415 if (sc->hook == NULL)
418 m = m_getm2(NULL, len, M_NOWAIT, MT_DATA, M_PKTHDR);
420 if (sc->flags & FLG_DEBUG)
422 "%s: can't get mbuf\n", NG_NODE_NAME(node));
425 m->m_pkthdr.rcvif = NULL;
427 for (mb = m; mb != NULL; mb = mb->m_next) {
428 length = min(M_TRAILINGSPACE(mb), len - total);
430 memcpy(mtod(m, char *), (const char *)buf + total, length);
433 m->m_pkthdr.len += length;
437 * Odd, we have changed from non-bypass to bypass. It is
438 * unlikely but not impossible, flush the data first.
440 NG_SEND_DATA_ONLY(error, sc->hook, sc->m);
443 NG_SEND_DATA_ONLY(error, sc->hook, m);
449 * Receive data coming from the device one char at a time, when it is not in
453 ngt_rint(struct tty *tp, char c, int flags)
455 sc_p sc = ttyhook_softc(tp);
456 node_p node = sc->node;
460 tty_assert_locked(tp);
462 if (sc->hook == NULL)
466 /* framing error or overrun on this char */
467 if (sc->flags & FLG_DEBUG)
468 log(LOG_DEBUG, "%s: line error %x\n",
469 NG_NODE_NAME(node), flags);
473 /* Get a new header mbuf if we need one */
475 MGETHDR(m, M_NOWAIT, MT_DATA);
477 if (sc->flags & FLG_DEBUG)
479 "%s: can't get mbuf\n", NG_NODE_NAME(node));
482 m->m_len = m->m_pkthdr.len = 0;
483 m->m_pkthdr.rcvif = NULL;
487 /* Add char to mbuf */
488 *mtod(m, u_char *) = c;
493 /* Ship off mbuf if it's time */
494 if (sc->hotchar == -1 || c == sc->hotchar || m->m_len >= MHLEN) {
496 NG_SEND_DATA_ONLY(error, sc->hook, m); /* Will queue */
503 ngt_rint_poll(struct tty *tp)
505 /* We can always accept input */