/* $NetBSD: if_sl.c,v 1.131 2019/01/24 09:33:03 knakahara Exp $ */ /* * Copyright (c) 1987, 1989, 1992, 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. 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. * * @(#)if_sl.c 8.9 (Berkeley) 1/9/95 */ /* * Serial Line interface * * Rick Adams * Center for Seismic Studies * 1300 N 17th Street, Suite 1450 * Arlington, Virginia 22209 * (703)276-7900 * rick@seismo.ARPA * seismo!rick * * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). * N.B.: this belongs in netinet, not net, the way it stands now. * Should have a link-layer type designation, but wouldn't be * backwards-compatible. * * Converted to 4.3BSD Beta by Chris Torek. * Other changes made at Berkeley, based in part on code by Kirk Smith. * W. Jolitz added slip abort. * * Hacked almost beyond recognition by Van Jacobson (van@helios.ee.lbl.gov). * Added priority queuing for "interactive" traffic; hooks for TCP * header compression; ICMP filtering (at 2400 baud, some cretin * pinging you can use up all your bandwidth). Made low clist behavior * more robust and slightly less likely to hang serial line. * Sped up a bunch of things. */ #include __KERNEL_RCSID(0, "$NetBSD: if_sl.c,v 1.131 2019/01/24 09:33:03 knakahara Exp $"); #ifdef _KERNEL_OPT #include "opt_inet.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #if __NetBSD__ #include #include #endif #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #endif #include #include #include #include #include #include #include #include "ioconf.h" /* * SLMAX is a hard limit on input packet size. To simplify the code * and improve performance, we require that packets fit in an mbuf * cluster, and if we get a compressed packet, there's enough extra * room to expand the header into a max length tcp/ip header (128 * bytes). So, SLMAX can be at most * MCLBYTES - 128 * * SLMTU is a hard limit on output packet size. To insure good * interactive response, SLMTU wants to be the smallest size that * amortizes the header cost. (Remember that even with * type-of-service queuing, we have to wait for any in-progress * packet to finish. I.e., we wait, on the average, 1/2 * mtu / * cps, where cps is the line speed in characters per second. * E.g., 533ms wait for a 1024 byte MTU on a 9600 baud line. The * average compressed header size is 6-8 bytes so any MTU > 90 * bytes will give us 90% of the line bandwidth. A 100ms wait is * tolerable (500ms is not), so want an MTU around 296. (Since TCP * will send 256 byte segments (to allow for 40 byte headers), the * typical packet size on the wire will be around 260 bytes). In * 4.3tahoe+ systems, we can set an MTU in a route so we do that & * leave the interface MTU relatively high (so we don't IP fragment * when acting as a gateway to someone using a stupid MTU). * * Similar considerations apply to SLIP_HIWAT: It's the amount of * data that will be queued 'downstream' of us (i.e., in clists * waiting to be picked up by the tty output interrupt). If we * queue a lot of data downstream, it's immune to our t.o.s. queuing. * E.g., if SLIP_HIWAT is 1024, the interactive traffic in mixed * telnet/ftp will see a 1 sec wait, independent of the mtu (the * wait is dependent on the ftp window size but that's typically * 1k - 4k). So, we want SLIP_HIWAT just big enough to amortize * the cost (in idle time on the wire) of the tty driver running * off the end of its clists & having to call back slstart for a * new packet. For a tty interface with any buffering at all, this * cost will be zero. Even with a totally brain dead interface (like * the one on a typical workstation), the cost will be <= 1 character * time. So, setting SLIP_HIWAT to ~100 guarantees that we'll lose * at most 1% while maintaining good interactive response. */ #define BUFOFFSET (128+sizeof(struct ifnet **)+SLIP_HDRLEN) #define SLMAX (MCLBYTES - BUFOFFSET) #define SLBUFSIZE (SLMAX + BUFOFFSET) #ifndef SLMTU #define SLMTU 296 #endif #if (SLMTU < 3) #error SLMTU way too small. #endif #define SLIP_HIWAT roundup(50, TTROUND) #ifndef __NetBSD__ /* XXX - cgd */ #define CLISTRESERVE 1024 /* Can't let clists get too low */ #endif /* !__NetBSD__ */ /* * SLIP ABORT ESCAPE MECHANISM: * (inspired by HAYES modem escape arrangement) * 1sec escape 1sec escape 1sec escape { 1sec escape 1sec escape } * within window time signals a "soft" exit from slip mode by remote end * if the IFF_DEBUG flag is on. */ #define ABT_ESC '\033' /* can't be t_intr - distant host must know it*/ #define ABT_IDLE 1 /* in seconds - idle before an escape */ #define ABT_COUNT 3 /* count of escapes for abort */ #define ABT_WINDOW (ABT_COUNT*2+2) /* in seconds - time to count */ static int sl_clone_create(struct if_clone *, int); static int sl_clone_destroy(struct ifnet *); static LIST_HEAD(, sl_softc) sl_softc_list; struct if_clone sl_cloner = IF_CLONE_INITIALIZER("sl", sl_clone_create, sl_clone_destroy); #define FRAME_END 0xc0 /* Frame End */ #define FRAME_ESCAPE 0xdb /* Frame Esc */ #define TRANS_FRAME_END 0xdc /* transposed frame end */ #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ static void slintr(void *); static int slcreate(struct sl_softc *); static struct mbuf *sl_btom(struct sl_softc *, int); static int slclose(struct tty *, int); static int slinput(int, struct tty *); static int slioctl(struct ifnet *, u_long, void *); static int slopen(dev_t, struct tty *); static int sloutput(struct ifnet *, struct mbuf *, const struct sockaddr *, const struct rtentry *); static int slstart(struct tty *); static int sltioctl(struct tty *, u_long, void *, int, struct lwp *); static struct linesw slip_disc = { .l_name = "slip", .l_open = slopen, .l_close = slclose, .l_read = ttyerrio, .l_write = ttyerrio, .l_ioctl = sltioctl, .l_rint = slinput, .l_start = slstart, .l_modem = nullmodem, .l_poll = ttyerrpoll }; void slattach(int n __unused) { /* * Nothing to do here, initialization is handled by the * module initialization code in slinit() below). */ } static void slinit(void) { if (ttyldisc_attach(&slip_disc) != 0) panic("%s", __func__); LIST_INIT(&sl_softc_list); if_clone_attach(&sl_cloner); } static int sldetach(void) { int error = 0; if (!LIST_EMPTY(&sl_softc_list)) error = EBUSY; if (error == 0) error = ttyldisc_detach(&slip_disc); if (error == 0) if_clone_detach(&sl_cloner); return error; } static int sl_clone_create(struct if_clone *ifc, int unit) { struct sl_softc *sc; sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); sc->sc_unit = unit; if_initname(&sc->sc_if, ifc->ifc_name, unit); sc->sc_if.if_softc = sc; sc->sc_if.if_mtu = SLMTU; sc->sc_if.if_flags = IFF_POINTOPOINT | SC_AUTOCOMP | IFF_MULTICAST; sc->sc_if.if_type = IFT_SLIP; sc->sc_if.if_ioctl = slioctl; sc->sc_if.if_output = sloutput; sc->sc_if.if_dlt = DLT_SLIP; sc->sc_fastq.ifq_maxlen = 32; IFQ_SET_READY(&sc->sc_if.if_snd); if_attach(&sc->sc_if); if_alloc_sadl(&sc->sc_if); bpf_attach(&sc->sc_if, DLT_SLIP, SLIP_HDRLEN); LIST_INSERT_HEAD(&sl_softc_list, sc, sc_iflist); return 0; } static int sl_clone_destroy(struct ifnet *ifp) { struct sl_softc *sc = (struct sl_softc *)ifp->if_softc; if (sc->sc_ttyp != NULL) return EBUSY; /* Not removing it */ LIST_REMOVE(sc, sc_iflist); bpf_detach(ifp); if_detach(ifp); free(sc, M_DEVBUF); return 0; } static int slcreate(struct sl_softc *sc) { if (sc->sc_mbuf == NULL) { sc->sc_mbuf = m_gethdr(M_WAIT, MT_DATA); m_clget(sc->sc_mbuf, M_WAIT); } sc->sc_ep = (u_char *)sc->sc_mbuf->m_ext.ext_buf + sc->sc_mbuf->m_ext.ext_size; sc->sc_mp = sc->sc_pktstart = (u_char *)sc->sc_mbuf->m_ext.ext_buf + BUFOFFSET; #ifdef INET sl_compress_init(&sc->sc_comp); #endif return 1; } /* * Line specific open routine. * Attach the given tty to the first available sl unit. */ /* ARGSUSED */ static int slopen(dev_t dev, struct tty *tp) { struct lwp *l = curlwp; /* XXX */ struct sl_softc *sc; int error; error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE_SLIP, KAUTH_REQ_NETWORK_INTERFACE_SLIP_ADD, NULL, NULL, NULL); if (error) return error; if (tp->t_linesw == &slip_disc) return 0; LIST_FOREACH(sc, &sl_softc_list, sc_iflist) if (sc->sc_ttyp == NULL) { sc->sc_si = softint_establish(SOFTINT_NET, slintr, sc); if (sc->sc_si == NULL) return ENOMEM; if (slcreate(sc) == 0) { softint_disestablish(sc->sc_si); return ENOBUFS; } tp->t_sc = (void *)sc; sc->sc_ttyp = tp; sc->sc_if.if_baudrate = tp->t_ospeed; mutex_spin_enter(&tty_lock); tp->t_state |= TS_ISOPEN | TS_XCLUDE; ttyflush(tp, FREAD | FWRITE); /* * make sure tty output queue is large enough * to hold a full-sized packet (including frame * end, and a possible extra frame end). full-sized * packet occupies a max of 2*SLMAX bytes (because * of possible escapes), and add two on for frame * ends. */ if (tp->t_outq.c_cn < 2 * SLMAX + 2) { sc->sc_oldbufsize = tp->t_outq.c_cn; sc->sc_oldbufquot = tp->t_outq.c_cq != 0; clfree(&tp->t_outq); mutex_spin_exit(&tty_lock); error = clalloc(&tp->t_outq, 2 * SLMAX + 2, 0); if (error) { softint_disestablish(sc->sc_si); /* * clalloc() might return -1 which * is no good, so we need to return * something else. */ return ENOMEM; /* XXX ?! */ } } else { sc->sc_oldbufsize = sc->sc_oldbufquot = 0; mutex_spin_exit(&tty_lock); } return 0; } return ENXIO; } /* * Line specific close routine. * Detach the tty from the sl unit. */ static int slclose(struct tty *tp, int flag) { struct sl_softc *sc; int s; ttywflush(tp); sc = tp->t_sc; if (sc != NULL) { softint_disestablish(sc->sc_si); s = splnet(); if_down(&sc->sc_if); IF_PURGE(&sc->sc_fastq); splx(s); s = spltty(); ttyldisc_release(tp->t_linesw); tp->t_linesw = ttyldisc_default(); tp->t_state = 0; sc->sc_ttyp = NULL; tp->t_sc = NULL; m_freem(sc->sc_mbuf); sc->sc_mbuf = NULL; sc->sc_ep = sc->sc_mp = sc->sc_pktstart = NULL; IF_PURGE(&sc->sc_inq); /* * If necessary, install a new outq buffer of the * appropriate size. */ if (sc->sc_oldbufsize != 0) { clfree(&tp->t_outq); clalloc(&tp->t_outq, sc->sc_oldbufsize, sc->sc_oldbufquot); } splx(s); } return 0; } /* * Line specific (tty) ioctl routine. * Provide a way to get the sl unit number. */ /* ARGSUSED */ static int sltioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) { struct sl_softc *sc = (struct sl_softc *)tp->t_sc; /* * XXX * This function can be called without KERNEL_LOCK when caller's * struct cdevsw is set D_MPSAFE. Is KERNEL_LOCK required? */ switch (cmd) { case SLIOCGUNIT: *(int *)data = sc->sc_unit; /* XXX */ break; default: return EPASSTHROUGH; } return 0; } /* * Queue a packet. Start transmission if not active. * Compression happens in slintr(); if we do it here, IP TOS * will cause us to not compress "background" packets, because * ordering gets trashed. It can be done for all packets in slintr(). */ static int sloutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, const struct rtentry *rtp) { struct sl_softc *sc = ifp->if_softc; struct ip *ip; struct ifqueue *ifq = NULL; int s, error; IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); /* * `Cannot happen' (see slioctl). Someday we will extend * the line protocol to support other address families. */ if (dst->sa_family != AF_INET) { printf("%s: af%d not supported\n", sc->sc_if.if_xname, dst->sa_family); m_freem(m); sc->sc_if.if_noproto++; return EAFNOSUPPORT; } if (sc->sc_ttyp == NULL) { m_freem(m); return ENETDOWN; /* sort of */ } if ((sc->sc_ttyp->t_state & TS_CARR_ON) == 0 && (sc->sc_ttyp->t_cflag & CLOCAL) == 0) { m_freem(m); printf("%s: no carrier and not local\n", sc->sc_if.if_xname); return EHOSTUNREACH; } ip = mtod(m, struct ip *); #ifdef INET if (sc->sc_if.if_flags & SC_NOICMP && ip->ip_p == IPPROTO_ICMP) { m_freem(m); return ENETRESET; /* XXX ? */ } #endif s = spltty(); if (sc->sc_oqlen && sc->sc_ttyp->t_outq.c_cc == sc->sc_oqlen) { struct bintime bt; /* if output's been stalled for too long, and restart */ getbinuptime(&bt); bintime_sub(&bt, &sc->sc_lastpacket); if (bt.sec > 0) { sc->sc_otimeout++; slstart(sc->sc_ttyp); } } splx(s); s = splnet(); #ifdef INET if ((ip->ip_tos & IPTOS_LOWDELAY) != 0) ifq = &sc->sc_fastq; #endif if ((error = ifq_enqueue2(ifp, ifq, m)) != 0) { splx(s); return error; } getbinuptime(&sc->sc_lastpacket); splx(s); s = spltty(); if ((sc->sc_oqlen = sc->sc_ttyp->t_outq.c_cc) == 0) slstart(sc->sc_ttyp); splx(s); return 0; } /* * Start output on interface. Get another datagram * to send from the interface queue and map it to * the interface before starting output. */ static int slstart(struct tty *tp) { struct sl_softc *sc = tp->t_sc; /* * If there is more in the output queue, just send it now. * We are being called in lieu of ttstart and must do what * it would. */ if (tp->t_outq.c_cc != 0) { (*tp->t_oproc)(tp); if (tp->t_outq.c_cc > SLIP_HIWAT) return 0; } /* * This happens briefly when the line shuts down. */ if (sc == NULL) return 0; softint_schedule(sc->sc_si); return 0; } /* * Copy data buffer to mbuf chain; add ifnet pointer. */ static struct mbuf * sl_btom(struct sl_softc *sc, int len) { struct mbuf *m; /* * Allocate a new input buffer and swap. */ m = sc->sc_mbuf; MGETHDR(sc->sc_mbuf, M_DONTWAIT, MT_DATA); if (sc->sc_mbuf == NULL) { sc->sc_mbuf = m; return NULL; } MCLGET(sc->sc_mbuf, M_DONTWAIT); if ((sc->sc_mbuf->m_flags & M_EXT) == 0) { m_freem(sc->sc_mbuf); sc->sc_mbuf = m; return NULL; } sc->sc_ep = (u_char *)sc->sc_mbuf->m_ext.ext_buf + sc->sc_mbuf->m_ext.ext_size; m->m_data = sc->sc_pktstart; m->m_pkthdr.len = m->m_len = len; m_set_rcvif(m, &sc->sc_if); return m; } /* * tty interface receiver interrupt. */ static int slinput(int c, struct tty *tp) { struct sl_softc *sc; struct mbuf *m; int len; tk_nin++; sc = (struct sl_softc *)tp->t_sc; if (sc == NULL) return 0; if ((c & TTY_ERRORMASK) || ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)) { sc->sc_flags |= SC_ERROR; return 0; } c &= TTY_CHARMASK; ++sc->sc_if.if_ibytes; if (sc->sc_if.if_flags & IFF_DEBUG) { if (c == ABT_ESC) { /* * If we have a previous abort, see whether * this one is within the time limit. */ if (sc->sc_abortcount && time_second >= sc->sc_starttime + ABT_WINDOW) sc->sc_abortcount = 0; /* * If we see an abort after "idle" time, count it; * record when the first abort escape arrived. */ if (time_second >= sc->sc_lasttime + ABT_IDLE) { if (++sc->sc_abortcount == 1) sc->sc_starttime = time_second; if (sc->sc_abortcount >= ABT_COUNT) { slclose(tp, 0); return 0; } } } else sc->sc_abortcount = 0; sc->sc_lasttime = time_second; } switch (c) { case TRANS_FRAME_ESCAPE: if (sc->sc_escape) c = FRAME_ESCAPE; break; case TRANS_FRAME_END: if (sc->sc_escape) c = FRAME_END; break; case FRAME_ESCAPE: sc->sc_escape = 1; return 0; case FRAME_END: if (sc->sc_flags & SC_ERROR) { sc->sc_flags &= ~SC_ERROR; goto newpack; } len = sc->sc_mp - sc->sc_pktstart; if (len < 3) /* less than min length packet - ignore */ goto newpack; m = sl_btom(sc, len); if (m == NULL) goto error; IF_ENQUEUE(&sc->sc_inq, m); softint_schedule(sc->sc_si); goto newpack; } if (sc->sc_mp < sc->sc_ep) { *sc->sc_mp++ = c; sc->sc_escape = 0; return 0; } /* can't put lower; would miss an extra frame */ sc->sc_flags |= SC_ERROR; error: sc->sc_if.if_ierrors++; newpack: sc->sc_mp = sc->sc_pktstart = (u_char *)sc->sc_mbuf->m_ext.ext_buf + BUFOFFSET; sc->sc_escape = 0; return 0; } static void slintr(void *arg) { struct sl_softc *sc = arg; struct tty *tp = sc->sc_ttyp; struct mbuf *m, *n; int s, len; u_char *pktstart; u_char chdr[CHDR_LEN]; KASSERT(tp != NULL); /* * Output processing loop. */ mutex_enter(softnet_lock); for (;;) { struct mbuf *m2; struct mbuf *bpf_m; /* * Do not remove the packet from the queue if it * doesn't look like it will fit into the current * serial output queue. With a packet full of * escapes, this could be as bad as MTU*2+2. */ s = spltty(); if (tp->t_outq.c_cn - tp->t_outq.c_cc < 2 * sc->sc_if.if_mtu + 2) { splx(s); break; } splx(s); /* * Get a packet and send it to the interface. */ s = splnet(); IF_DEQUEUE(&sc->sc_fastq, m); if (m) sc->sc_if.if_omcasts++; /* XXX */ else IFQ_DEQUEUE(&sc->sc_if.if_snd, m); splx(s); if (m == NULL) break; /* * We do the header compression here rather than in * sloutput() because the packets will be out of order * if we are using TOS queueing, and the connection * ID compression will get munged when this happens. */ if (sc->sc_if.if_bpf) { /* * We need to save the TCP/IP header before * it's compressed. To avoid complicated * code, we just make a deep copy of the * entire packet (since this is a serial * line, packets should be short and/or the * copy should be negligible cost compared * to the packet transmission time). */ bpf_m = m_dup(m, 0, M_COPYALL, M_DONTWAIT); } else bpf_m = NULL; #ifdef INET struct ip *ip; if ((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP) { if (sc->sc_if.if_flags & SC_COMPRESS) *mtod(m, u_char *) |= sl_compress_tcp(m, ip, &sc->sc_comp, 1); } #endif if (bpf_m) bpf_mtap_sl_out(&sc->sc_if, mtod(m, u_char *), bpf_m); getbinuptime(&sc->sc_lastpacket); s = spltty(); /* * The extra FRAME_END will start up a new packet, * and thus will flush any accumulated garbage. We * do this whenever the line may have been idle for * some time. */ if (tp->t_outq.c_cc == 0) { sc->sc_if.if_obytes++; (void)putc(FRAME_END, &tp->t_outq); } while (m) { u_char *bp, *cp, *ep; bp = cp = mtod(m, u_char *); ep = cp + m->m_len; while (cp < ep) { /* * Find out how many bytes in the * string we can handle without * doing something special. */ while (cp < ep) { switch (*cp++) { case FRAME_ESCAPE: case FRAME_END: cp--; goto out; } } out: if (cp > bp) { /* * Put N characters at once * into the tty output queue. */ if (b_to_q(bp, cp - bp, &tp->t_outq)) break; sc->sc_if.if_obytes += cp - bp; } /* * If there are characters left in * the mbuf, the first one must be * special.. Put it out in a different * form. */ if (cp < ep) { if (putc(FRAME_ESCAPE, &tp->t_outq)) break; if (putc(*cp++ == FRAME_ESCAPE ? TRANS_FRAME_ESCAPE : TRANS_FRAME_END, &tp->t_outq)) { (void)unputc(&tp->t_outq); break; } sc->sc_if.if_obytes += 2; } bp = cp; } m = m2 = m_free(m); } if (putc(FRAME_END, &tp->t_outq)) { /* * Not enough room. Remove a char to make * room and end the packet normally. If * you get many collisions (more than one * or two a day), you probably do not have * enough clists and you should increase * "nclist" in param.c */ (void)unputc(&tp->t_outq); (void)putc(FRAME_END, &tp->t_outq); sc->sc_if.if_collisions++; } else { sc->sc_if.if_obytes++; sc->sc_if.if_opackets++; } /* * We now have characters in the output queue, * kick the serial port. */ (*tp->t_oproc)(tp); splx(s); } /* * Input processing loop. */ for (;;) { s = spltty(); IF_DEQUEUE(&sc->sc_inq, m); splx(s); if (m == NULL) break; pktstart = mtod(m, u_char *); len = m->m_pkthdr.len; if (sc->sc_if.if_bpf) { /* * Save the compressed header, so we * can tack it on later. Note that we * will end up copying garbage in some * cases but this is okay. We remember * where the buffer started so we can * compute the new header length. */ memcpy(chdr, pktstart, CHDR_LEN); } #ifdef INET u_char c; if ((c = (*pktstart & 0xf0)) != (IPVERSION << 4)) { if (c & 0x80) c = TYPE_COMPRESSED_TCP; else if (c == TYPE_UNCOMPRESSED_TCP) *pktstart &= 0x4f; /* XXX */ /* * We've got something that's not an IP * packet. If compression is enabled, * try to decompress it. Otherwise, if * `auto-enable' compression is on and * it's a reasonable packet, decompress * it and then enable compression. * Otherwise, drop it. */ if (sc->sc_if.if_flags & SC_COMPRESS) { len = sl_uncompress_tcp(&pktstart, len, (u_int)c, &sc->sc_comp); if (len <= 0) { m_freem(m); continue; } } else if ((sc->sc_if.if_flags & SC_AUTOCOMP) && c == TYPE_UNCOMPRESSED_TCP && len >= 40) { len = sl_uncompress_tcp(&pktstart, len, (u_int)c, &sc->sc_comp); if (len <= 0) { m_freem(m); continue; } sc->sc_if.if_flags |= SC_COMPRESS; } else { m_freem(m); continue; } } #endif m->m_data = (void *) pktstart; m->m_pkthdr.len = m->m_len = len; if (sc->sc_if.if_bpf) { bpf_mtap_sl_in(&sc->sc_if, chdr, &m); if (m == NULL) continue; } /* * If the packet will fit into a single * header mbuf, try to copy it into one, * to save memory. */ if ((m->m_pkthdr.len < MHLEN) && (n = m_gethdr(M_DONTWAIT, MT_DATA))) { int pktlen; pktlen = m->m_pkthdr.len; m_move_pkthdr(n, m); memcpy(mtod(n, void *), mtod(m, void *), pktlen); n->m_len = m->m_len; m_freem(m); m = n; } sc->sc_if.if_ipackets++; getbinuptime(&sc->sc_lastpacket); #ifdef INET s = splnet(); if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { sc->sc_if.if_ierrors++; sc->sc_if.if_iqdrops++; m_freem(m); } splx(s); #endif } mutex_exit(softnet_lock); } /* * Process an ioctl request. */ static int slioctl(struct ifnet *ifp, u_long cmd, void *data) { struct ifaddr *ifa = (struct ifaddr *)data; struct ifreq *ifr = (struct ifreq *)data; int s = splnet(), error = 0; struct sl_softc *sc = ifp->if_softc; struct ppp_stats *psp; struct ppp_comp_stats *pcp; switch (cmd) { case SIOCINITIFADDR: if (ifa->ifa_addr->sa_family == AF_INET) ifp->if_flags |= IFF_UP; else error = EAFNOSUPPORT; break; case SIOCSIFDSTADDR: if (ifreq_getaddr(cmd, ifr)->sa_family != AF_INET) error = EAFNOSUPPORT; break; case SIOCSIFMTU: if ((ifr->ifr_mtu < 3) || (ifr->ifr_mtu > SLMAX)) { error = EINVAL; break; } /*FALLTHROUGH*/ case SIOCGIFMTU: if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) error = 0; break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == 0) { error = EAFNOSUPPORT; /* XXX */ break; } switch (ifreq_getaddr(cmd, ifr)->sa_family) { #ifdef INET case AF_INET: break; #endif default: error = EAFNOSUPPORT; break; } break; case SIOCGPPPSTATS: psp = &((struct ifpppstatsreq *) data)->stats; (void)memset(psp, 0, sizeof(*psp)); psp->p.ppp_ibytes = sc->sc_if.if_ibytes; psp->p.ppp_ipackets = sc->sc_if.if_ipackets; psp->p.ppp_ierrors = sc->sc_if.if_ierrors; psp->p.ppp_obytes = sc->sc_if.if_obytes; psp->p.ppp_opackets = sc->sc_if.if_opackets; psp->p.ppp_oerrors = sc->sc_if.if_oerrors; #ifdef INET psp->vj.vjs_packets = sc->sc_comp.sls_packets; psp->vj.vjs_compressed = sc->sc_comp.sls_compressed; psp->vj.vjs_searches = sc->sc_comp.sls_searches; psp->vj.vjs_misses = sc->sc_comp.sls_misses; psp->vj.vjs_uncompressedin = sc->sc_comp.sls_uncompressedin; psp->vj.vjs_compressedin = sc->sc_comp.sls_compressedin; psp->vj.vjs_errorin = sc->sc_comp.sls_errorin; psp->vj.vjs_tossed = sc->sc_comp.sls_tossed; #endif break; case SIOCGPPPCSTATS: pcp = &((struct ifpppcstatsreq *) data)->stats; (void)memset(pcp, 0, sizeof(*pcp)); break; default: error = ifioctl_common(ifp, cmd, data); break; } splx(s); return error; } /* * Module infrastructure */ #include "if_module.h" IF_MODULE(MODULE_CLASS_DRIVER, sl, "slcompress");