From: Paul Mackerras Date: Wed, 10 May 1995 01:38:47 +0000 (+0000) Subject: Initial revision X-Git-Tag: RELEASE_2_3_6~717 X-Git-Url: https://git.ozlabs.org/?a=commitdiff_plain;h=eeeeae4502021b0dac85d3212f1b25a94496ee94;p=ppp.git Initial revision --- diff --git a/svr4/Makefile b/svr4/Makefile new file mode 100644 index 0000000..20ac151 --- /dev/null +++ b/svr4/Makefile @@ -0,0 +1,13 @@ +CFLAGS= -D_KERNEL -I../current +CC= gcc + +all: ppp x ppp_ahdlc + +ppp: ppp.o + ld -r -o ppp ppp.o + +ppp_ahdlc: ppp_ahdlc.o + ld -r -o ppp_ahdlc ppp_ahdlc.o + +x: x.c + $(CC) -I../current -g -o x x.c diff --git a/svr4/ppp.c b/svr4/ppp.c new file mode 100644 index 0000000..4b66658 --- /dev/null +++ b/svr4/ppp.c @@ -0,0 +1,961 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef __STDC__ +#define __P(x) x +#else +#define __P(x) () +#endif + +/* + * The IP module uses this SAP value for IP packets. + */ +#ifndef ETHERTYPE_IP +#define ETHERTYPE_IP 0x800 +#endif + +#ifndef PPP_MAXMTU +#define PPP_MAXMTU 65536 +#endif + +/* + * Private information; one per upper stream. + */ +struct upperstr { + minor_t mn; /* minor device number */ + queue_t *q; /* read q associated with this upper stream */ + int flags; /* flag bits, see below */ + int state; /* current DLPI state */ + int sap; /* service access point */ + struct upperstr *ppa; /* control stream for our ppa */ + struct upperstr *next; /* next stream for this ppa */ + /* + * There is exactly one control stream for each PPA. + * The following fields are only used for control streams. + */ + int ppa_id; + queue_t *lowerq; /* write queue attached below this PPA */ + struct upperstr *nextppa; /* next control stream */ +}; + +/* Values for flags */ +#define US_PRIV 1 /* stream was opened by superuser */ +#define US_CONTROL 2 /* stream is a control stream */ +#define US_BLOCKED 4 /* flow ctrl has blocked lower stream */ + +static void *upper_states; +static struct upperstr *ppas; + +static int ppp_identify __P((dev_info_t *)); +static int ppp_attach __P((dev_info_t *, ddi_attach_cmd_t)); +static int ppp_detach __P((dev_info_t *, ddi_detach_cmd_t)); +static int ppp_devinfo __P((dev_info_t *, ddi_info_cmd_t, void *, void **)); +static int pppopen __P((queue_t *, dev_t *, int, int, cred_t *)); +static int pppclose __P((queue_t *, int, cred_t *)); +static int pppuwput __P((queue_t *, mblk_t *)); +static int pppursrv __P((queue_t *)); +static int pppuwsrv __P((queue_t *)); +static int ppplrput __P((queue_t *, mblk_t *)); +static int ppplrsrv __P((queue_t *)); +static int ppplwsrv __P((queue_t *)); +static void dlpi_request __P((queue_t *, mblk_t *, struct upperstr *)); +static void dlpi_error __P((queue_t *, int, int, int)); +static void dlpi_ok __P((queue_t *, int)); +static int send_data __P((mblk_t *, struct upperstr *)); +static void new_ppa __P((queue_t *, mblk_t *)); +static struct upperstr *find_dest __P((struct upperstr *, int)); + +static struct module_info ppp_info = { + 0xb1a6, "ppp", 0, 512, 512, 128 +}; + +static struct qinit pppurint = { + NULL, pppursrv, pppopen, pppclose, NULL, &ppp_info, NULL +}; + +static struct qinit pppuwint = { + pppuwput, pppuwsrv, NULL, NULL, NULL, &ppp_info, NULL +}; + +static struct qinit ppplrint = { + ppplrput, ppplrsrv, NULL, NULL, NULL, &ppp_info, NULL +}; + +static struct qinit ppplwint = { + NULL, ppplwsrv, NULL, NULL, NULL, &ppp_info, NULL +}; + +static struct streamtab pppinfo = { + &pppurint, &pppuwint, + &ppplrint, &ppplwint +}; + +static dev_info_t *ppp_dip; + +static struct cb_ops cb_ppp_ops = { + nulldev, nulldev, nodev, nodev, /* cb_open, ... */ + nodev, nodev, nodev, nodev, /* cb_dump, ... */ + nodev, nodev, nodev, nochpoll, /* cb_devmap, ... */ + ddi_prop_op, /* cb_prop_op */ + &pppinfo, /* cb_stream */ + D_NEW|D_MP|D_MTQPAIR|D_MTOUTPERIM|D_MTOCEXCL /* cb_flag */ +}; + +static struct dev_ops ppp_ops = { + DEVO_REV, /* devo_rev */ + 0, /* devo_refcnt */ + ppp_devinfo, /* devo_getinfo */ + ppp_identify, /* devo_identify */ + nulldev, /* devo_probe */ + ppp_attach, /* devo_attach */ + ppp_detach, /* devo_detach */ + nodev, /* devo_reset */ + &cb_ppp_ops, /* devo_cb_ops */ + NULL /* devo_bus_ops */ +}; + +/* + * Module linkage information + */ + +static struct modldrv modldrv = { + &mod_driverops, /* says this is a pseudo driver */ + "PPP-2.2 multiplexing driver", + &ppp_ops /* driver ops */ +}; + +static struct modlinkage modlinkage = { + MODREV_1, + (void *) &modldrv, + NULL +}; + +int +_init(void) +{ + int error; + + error = ddi_soft_state_init(&upper_states, sizeof(struct upperstr), 4); + if (!error) { + error = mod_install(&modlinkage); + if (!error) + return 0; + ddi_soft_state_fini(&upper_states); + } + return error; +} + +int +_fini(void) +{ + int error; + + error = mod_remove(&modlinkage); + if (error) + return error; + ddi_soft_state_fini(&upper_states); + return 0; +} + +int +_info(mip) + struct modinfo *mip; +{ + return mod_info(&modlinkage, mip); +} + +static int +ppp_identify(dip) + dev_info_t *dip; +{ + return strcmp(ddi_get_name(dip), "ppp") == 0? DDI_IDENTIFIED: + DDI_NOT_IDENTIFIED; +} + +static int +ppp_attach(dip, cmd) + dev_info_t *dip; + ddi_attach_cmd_t cmd; +{ + + if (cmd != DDI_ATTACH) + return DDI_FAILURE; + if (ddi_create_minor_node(dip, "ppp", S_IFCHR, 0, DDI_PSEUDO, CLONE_DEV) + == DDI_FAILURE) { + ddi_remove_minor_node(dip, NULL); + return DDI_FAILURE; + } + return DDI_SUCCESS; +} + +static int +ppp_detach(dip, cmd) + dev_info_t *dip; + ddi_detach_cmd_t cmd; +{ + ddi_remove_minor_node(dip, NULL); + return DDI_SUCCESS; +} + +static int +ppp_devinfo(dip, cmd, arg, result) + dev_info_t *dip; + ddi_info_cmd_t cmd; + void *arg; + void **result; +{ + int error; + + error = DDI_SUCCESS; + switch (cmd) { + case DDI_INFO_DEVT2DEVINFO: + if (ppp_dip == NULL) + error = DDI_FAILURE; + else + *result = (void *) ppp_dip; + break; + case DDI_INFO_DEVT2INSTANCE: + *result = NULL; + break; + default: + error = DDI_FAILURE; + } + return error; +} + +static int +pppopen(q, devp, oflag, sflag, credp) + queue_t *q; + dev_t *devp; + int oflag, sflag; + cred_t *credp; +{ + struct upperstr *up; + minor_t mn; + + if (q->q_ptr) + return 0; /* device is already open */ + + if (sflag == CLONEOPEN) { + for (mn = 0; ddi_get_soft_state(upper_states, mn) != NULL; ++mn) + ; + } else { + mn = getminor(*devp); + } + cmn_err(CE_CONT, "pppopen: minor %d\n", mn); + + /* + * Construct a new minor node. + */ + if (ddi_soft_state_zalloc(upper_states, mn) != DDI_SUCCESS) + return ENXIO; + up = ddi_get_soft_state(upper_states, mn); + *devp = makedevice(getmajor(*devp), mn); + up->q = q; + up->mn = mn; + up->flags = 0; + if (drv_priv(credp) == 0) + up->flags |= US_PRIV; + up->state = DL_UNATTACHED; + up->sap = -1; + up->ppa = 0; + up->next = 0; + up->lowerq = 0; + q->q_ptr = up; + WR(q)->q_ptr = up; + noenable(WR(q)); + + qprocson(q); + return 0; +} + +static int +pppclose(q, flag, credp) + queue_t *q; + int flag; + cred_t *credp; +{ + struct upperstr *up, **upp; + struct upperstr *as, *asnext; + struct lowerstr *ls; + + qprocsoff(q); + + up = (struct upperstr *) q->q_ptr; + cmn_err(CE_CONT, "pppclose: minor %d\n", up->mn); + if (up->flags & US_CONTROL) { + /* + * This stream represents a PPA: + * For all streams attached to the PPA, clear their + * references to this PPA. + * Then remove this PPA from the list of PPAs. + */ + for (as = up->next; as != 0; as = asnext) { + asnext = as->next; + as->next = 0; + as->ppa = 0; + if (as->flags & US_BLOCKED) { + as->flags &= ~US_BLOCKED; + flushq(WR(as->q), FLUSHDATA); + } + } + for (upp = &ppas; *upp != 0; upp = &(*upp)->nextppa) + if (*upp == up) { + *upp = up->nextppa; + break; + } + + } else { + /* + * If this stream is attached to a PPA, + * remove it from the PPA's list. + */ + if ((as = up->ppa) != 0) { + for (; as->next != 0; as = as->next) + if (as->next == up) { + as->next = up->next; + break; + } + } + } + + q->q_ptr = NULL; + WR(q)->q_ptr = NULL; + ddi_soft_state_free(upper_states, up->mn); + + return 0; +} + +/* + * A message from on high. We do one of three things: + * - qreply() + * - put the message on the lower write stream + * - queue it for our service routine + */ +static int +pppuwput(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct upperstr *us, *usnext; + struct iocblk *iop; + struct linkblk *lb; + queue_t *lq; + int error; + mblk_t *mq; + + us = (struct upperstr *) q->q_ptr; + switch (mp->b_datap->db_type) { + case M_PCPROTO: + case M_PROTO: + dlpi_request(q, mp, us); + break; + + case M_DATA: + if (!send_data(mp, us)) + putq(q, mp); + break; + + case M_IOCTL: + iop = (struct iocblk *) mp->b_rptr; + cmn_err(CE_CONT, "ppp%d ioctl %x count=%d\n", us->mn, iop->ioc_cmd, + iop->ioc_count); + switch (iop->ioc_cmd) { + case I_LINK: + if ((us->flags & US_CONTROL) == 0 || us->lowerq != 0) + goto iocnak; + lb = (struct linkblk *) mp->b_cont->b_rptr; + us->lowerq = lq = lb->l_qbot; + lq->q_ptr = us; + WR(lq)->q_ptr = us; + iop->ioc_count = 0; + mp->b_datap->db_type = M_IOCACK; + qreply(q, mp); + /* Unblock upper streams which now feed this lower stream. */ + qenable(lq); + break; + + case I_UNLINK: + lb = (struct linkblk *) mp->b_cont->b_rptr; + if (us->lowerq != lb->l_qbot) + cmn_err(CE_CONT, "ppp unlink: lowerq=%x qbot=%x\n", + us->lowerq, lb->l_qbot); + us->lowerq = 0; + iop->ioc_count = 0; + mp->b_datap->db_type = M_IOCACK; + qreply(q, mp); + /* Unblock streams which now feed back up the control stream. */ + qenable(us->q); + break; + + case PPPIO_NEWPPA: + if (us->flags & US_CONTROL) + goto iocnak; + if ((us->flags & US_PRIV) == 0) { + iop->ioc_error = EPERM; + goto iocnak; + } + /* Arrange to return an int */ + if ((mq = mp->b_cont) == 0 + || mq->b_datap->db_lim - mq->b_rptr < sizeof(int)) { + mq = allocb(sizeof(int), BPRI_HI); + if (mq == 0) { + iop->ioc_error = ENOSR; + goto iocnak; + } + if (mp->b_cont != 0) + freemsg(mp->b_cont); + mp->b_cont = mq; + mq->b_cont = 0; + } + iop->ioc_count = sizeof(int); + mq->b_wptr = mq->b_rptr + sizeof(int); + qwriter(q, mp, new_ppa, PERIM_OUTER); + break; + + default: + if (us->ppa == 0 || us->ppa->lowerq == 0) + goto iocnak; + switch (iop->ioc_cmd) { + case PPPIO_GETSTAT: + case PPPIO_GETCSTAT: + break; + default: + if ((us->flags & US_PRIV) == 0) { + iop->ioc_error = EPERM; + goto iocnak; + } + } + putnext(us->ppa->lowerq, mp); + break; + + iocnak: + mp->b_datap->db_type = M_IOCNAK; + qreply(q, mp); + break; + } + break; + + case M_FLUSH: + if (*mp->b_rptr & FLUSHW) + flushq(q, FLUSHDATA); + if (*mp->b_rptr & FLUSHR) { + *mp->b_rptr &= ~FLUSHW; + qreply(q, mp); + } else + freemsg(mp); + break; + + default: + freemsg(mp); + break; + } + return 0; +} + +static void +dlpi_request(q, mp, us) + queue_t *q; + mblk_t *mp; + struct upperstr *us; +{ + union DL_primitives *d = (union DL_primitives *) mp->b_rptr; + int size = mp->b_wptr - mp->b_rptr; + mblk_t *reply, *np; + struct upperstr *t, *ppa; + int sap; + dl_info_ack_t *info; + dl_bind_ack_t *ackp; + dl_phys_addr_ack_t *adrp; + + cmn_err(CE_CONT, "ppp%d dlpi prim %x, state=%x\n", us->mn, + d->dl_primitive, us->state); + switch (d->dl_primitive) { + case DL_INFO_REQ: + if (size < sizeof(dl_info_req_t)) + goto badprim; + if ((reply = allocb(sizeof(dl_info_ack_t), BPRI_HI)) == 0) + break; /* should do bufcall */ + reply->b_datap->db_type = M_PCPROTO; + info = (dl_info_ack_t *) reply->b_wptr; + reply->b_wptr += sizeof(dl_info_ack_t); + bzero((caddr_t) info, sizeof(dl_info_ack_t)); + info->dl_primitive = DL_INFO_ACK; + info->dl_max_sdu = PPP_MAXMTU; + info->dl_min_sdu = 1; + info->dl_addr_length = sizeof(ulong); + info->dl_mac_type = DL_OTHER; + info->dl_current_state = us->state; + info->dl_sap_length = sizeof(ulong); + info->dl_service_mode = DL_CLDLS; + info->dl_provider_style = DL_STYLE2; + info->dl_version = DL_CURRENT_VERSION; + qreply(q, reply); + break; + + case DL_ATTACH_REQ: + if (size < sizeof(dl_attach_req_t)) + goto badprim; + if (us->state != DL_UNATTACHED || us->ppa != 0) { + dlpi_error(q, DL_ATTACH_REQ, DL_OUTSTATE, 0); + break; + } + for (ppa = ppas; ppa != 0; ppa = ppa->nextppa) + if (ppa->ppa_id == d->attach_req.dl_ppa) + break; + if (ppa == 0) { + dlpi_error(q, DL_ATTACH_REQ, DL_BADPPA, 0); + break; + } + us->ppa = ppa; + us->state = DL_UNBOUND; + for (t = ppa; t->next != 0; t = t->next) + ; + t->next = us; + us->next = 0; + dlpi_ok(q, DL_ATTACH_REQ); + break; + + case DL_DETACH_REQ: + if (size < sizeof(dl_detach_req_t)) + goto badprim; + if (us->state != DL_UNBOUND || us->ppa == 0) { + dlpi_error(q, DL_DETACH_REQ, DL_OUTSTATE, 0); + break; + } + for (t = us->ppa; t->next != 0; t = t->next) + if (t->next == us) { + t->next = us->next; + break; + } + us->next = 0; + us->ppa = 0; + us->state = DL_UNATTACHED; + dlpi_ok(q, DL_DETACH_REQ); + break; + + case DL_BIND_REQ: + if (size < sizeof(dl_bind_req_t)) + goto badprim; + if (us->state != DL_UNBOUND) { + dlpi_error(q, DL_BIND_REQ, DL_OUTSTATE, 0); + break; + } + if (d->bind_req.dl_service_mode != DL_CLDLS) { + dlpi_error(q, DL_BIND_REQ, DL_UNSUPPORTED, 0); + break; + } + /* saps must be valid PPP network protocol numbers */ + sap = d->bind_req.dl_sap; + cmn_err(CE_CONT, "ppp bind %x\n", sap); + if (sap == ETHERTYPE_IP) + sap = PPP_IP; + if (sap < 0x21 || sap > 0x3fff + || (sap & 1) == 0 || (sap & 0x100) != 0) { + dlpi_error(q, DL_BIND_REQ, DL_BADADDR, 0); + break; + } + us->sap = sap; + us->state = DL_IDLE; + if ((reply = allocb(sizeof(dl_bind_ack_t) + sizeof(ulong), + BPRI_HI)) == 0) + break; /* should do bufcall */ + ackp = (dl_bind_ack_t *) reply->b_wptr; + reply->b_wptr += sizeof(dl_bind_ack_t) + sizeof(ulong); + reply->b_datap->db_type = M_PCPROTO; + bzero((caddr_t) ackp, sizeof(dl_bind_ack_t)); + ackp->dl_primitive = DL_BIND_ACK; + ackp->dl_sap = sap; + ackp->dl_addr_length = sizeof(ulong); + ackp->dl_addr_offset = sizeof(dl_bind_ack_t); + *(ulong *)(ackp+1) = sap; + qreply(q, reply); + break; + + case DL_UNBIND_REQ: + if (size < sizeof(dl_unbind_req_t)) + goto badprim; + if (us->state != DL_IDLE) { + dlpi_error(q, DL_UNBIND_REQ, DL_OUTSTATE, 0); + break; + } + us->sap = -1; + us->state = DL_UNBOUND; + dlpi_ok(q, DL_UNBIND_REQ); + break; + + case DL_UNITDATA_REQ: + if (size < sizeof(dl_unitdata_req_t)) + goto badprim; + if (us->state != DL_IDLE) { + dlpi_error(q, DL_UNITDATA_REQ, DL_OUTSTATE, 0); + break; + } + /* this assumes PPP_HDRLEN <= sizeof(dl_unitdata_req_t) */ + if (mp->b_datap->db_ref > 1) { + np = allocb(PPP_HDRLEN, BPRI_HI); + if (np == 0) + break; /* gak! */ + np->b_cont = mp->b_cont; + mp->b_cont = 0; + freeb(mp); + mp = np; + } + /* XXX should use dl_dest_addr_offset/length here */ + mp->b_wptr = mp->b_rptr + PPP_HDRLEN; + mp->b_rptr[0] = PPP_ALLSTATIONS; + mp->b_rptr[1] = PPP_UI; + mp->b_rptr[2] = us->sap >> 8; + mp->b_rptr[3] = us->sap; + if (!send_data(mp, us)) + putq(q, mp); + return; + + case DL_SUBS_BIND_REQ: + case DL_SUBS_UNBIND_REQ: + case DL_ENABMULTI_REQ: + case DL_DISABMULTI_REQ: + case DL_PROMISCON_REQ: + case DL_PROMISCOFF_REQ: + case DL_PHYS_ADDR_REQ: + case DL_SET_PHYS_ADDR_REQ: + case DL_XID_REQ: + case DL_TEST_REQ: + case DL_CONNECT_REQ: + case DL_TOKEN_REQ: + case DL_REPLY_UPDATE_REQ: + case DL_GET_STATISTICS_REQ: + case DL_REPLY_REQ: + case DL_DATA_ACK_REQ: + dlpi_error(q, d->dl_primitive, DL_NOTSUPPORTED, 0); + break; + + case DL_CONNECT_RES: + case DL_DISCONNECT_REQ: + case DL_RESET_REQ: + case DL_RESET_RES: + dlpi_error(q, d->dl_primitive, DL_OUTSTATE, 0); + break; + + case DL_UDQOS_REQ: + dlpi_error(q, d->dl_primitive, DL_BADQOSTYPE, 0); + break; + + case DL_TEST_RES: + case DL_XID_RES: + break; + + default: + badprim: + dlpi_error(q, d->dl_primitive, DL_BADPRIM, 0); + break; + } + freemsg(mp); +} + +static void +dlpi_error(q, prim, err, uerr) + queue_t *q; + int prim, err, uerr; +{ + mblk_t *reply; + dl_error_ack_t *errp; + + reply = allocb(sizeof(dl_error_ack_t), BPRI_HI); + if (reply == 0) + return; /* XXX should do bufcall */ + reply->b_datap->db_type = M_PCPROTO; + errp = (dl_error_ack_t *) reply->b_wptr; + reply->b_wptr += sizeof(dl_error_ack_t); + errp->dl_primitive = DL_ERROR_ACK; + errp->dl_error_primitive = prim; + errp->dl_errno = err; + errp->dl_unix_errno = uerr; + qreply(q, reply); +} + +static void +dlpi_ok(q, prim) + queue_t *q; + int prim; +{ + mblk_t *reply; + dl_ok_ack_t *okp; + + reply = allocb(sizeof(dl_ok_ack_t), BPRI_HI); + if (reply == 0) + return; /* XXX should do bufcall */ + reply->b_datap->db_type = M_PCPROTO; + okp = (dl_ok_ack_t *) reply->b_wptr; + reply->b_wptr += sizeof(dl_ok_ack_t); + okp->dl_primitive = DL_OK_ACK; + okp->dl_correct_primitive = prim; + qreply(q, reply); +} + +static int +send_data(mp, us) + mblk_t *mp; + struct upperstr *us; +{ + queue_t *q; + struct upperstr *ppa; + + if (us->flags & US_BLOCKED) + return 0; + ppa = us->ppa; + if (ppa == 0) { + freemsg(mp); + return 1; + } + if ((q = ppa->lowerq) == 0) { + /* try to send it up the control stream */ + q = ppa->q; + } + if (canputnext(q)) { + putnext(q, mp); + return 1; + } + us->flags |= US_BLOCKED; + return 0; +} + +static void +new_ppa(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct upperstr *us, **usp; + int ppa_id; + + /* + * Allocate a new PPA id and link this stream into + * the list of PPAs. + */ + usp = &ppas; + ppa_id = 0; + while ((us = *usp) != 0 && ppa_id == us->ppa_id) { + ++ppa_id; + usp = &us->nextppa; + } + us = (struct upperstr *) q->q_ptr; + us->ppa_id = ppa_id; + us->ppa = us; + us->next = 0; + us->nextppa = *usp; + *usp = us; + us->flags |= US_CONTROL; + + *(int *)mp->b_cont->b_rptr = ppa_id; + mp->b_datap->db_type = M_IOCACK; + qreply(q, mp); +} + +static int +pppuwsrv(q) + queue_t *q; +{ + struct upperstr *us; + struct lowerstr *ls; + queue_t *lwq; + mblk_t *mp; + + us = (struct upperstr *) q->q_ptr; + while ((mp = getq(q)) != 0) { + if (!send_data(mp, us)) { + putbq(q, mp); + break; + } + } + return 0; +} + +static int +ppplwsrv(q) + queue_t *q; +{ + struct upperstr *us; + + /* + * Flow control has back-enabled this stream: + * enable the write service procedures of all upper + * streams feeding this lower stream. + */ + for (us = (struct upperstr *) q->q_ptr; us != NULL; us = us->next) + if (us->flags & US_BLOCKED) + qenable(WR(us->q)); + return 0; +} + +static int +pppursrv(q) + queue_t *q; +{ + struct upperstr *us, *as; + mblk_t *mp, *hdr; + dl_unitdata_ind_t *ud; + int proto; + + /* + * If this is a control stream and we don't have a lower queue attached, + * run the write service routines of other streams attached to this PPA. + */ + us = (struct upperstr *) q->q_ptr; + if (us->flags & US_CONTROL) { + /* + * A control stream. + * If there is no lower queue attached, run the write service + * routines of other upper streams attached to this PPA. + */ + if (us->lowerq == 0) { + as = us; + do { + if (as->flags & US_BLOCKED) + qenable(WR(as->q)); + as = as->next; + } while (as != 0); + } + } else { + /* + * A network protocol stream. Put a DLPI header on each + * packet and send it on. + */ + while ((mp = getq(q)) != 0) { + if (!canputnext(q)) { + putbq(q, mp); + break; + } + proto = PPP_PROTOCOL(mp->b_rptr); + mp->b_rptr += PPP_HDRLEN; + hdr = allocb(sizeof(dl_unitdata_ind_t) + 2 * sizeof(ulong), + BPRI_MED); + if (hdr == 0) { + /* XXX should put it back and use bufcall */ + freemsg(mp); + continue; + } + ud = (dl_unitdata_ind_t *) hdr->b_wptr; + hdr->b_wptr += sizeof(dl_unitdata_ind_t) + 2 * sizeof(ulong); + hdr->b_cont = mp; + ud->dl_primitive = DL_UNITDATA_IND; + ud->dl_dest_addr_length = sizeof(ulong); + ud->dl_dest_addr_offset = sizeof(dl_unitdata_ind_t); + ud->dl_src_addr_length = sizeof(ulong); + ud->dl_src_addr_offset = ud->dl_dest_addr_offset + sizeof(ulong); + ud->dl_group_address = 0; + ((ulong *)(ud + 1))[0] = proto; /* dest SAP */ + ((ulong *)(ud + 1))[1] = proto; /* src SAP */ + putnext(q, mp); + } + } + return 0; +} + +static struct upperstr * +find_dest(ppa, proto) + struct upperstr *ppa; + int proto; +{ + struct upperstr *us; + + for (us = ppa->next; us != 0; us = us->next) + if (proto == us->sap) + return us; + return 0; +} + +static int +ppplrput(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct upperstr *ppa, *us; + queue_t *uq; + int proto; + + ppa = (struct upperstr *) q->q_ptr; + switch (mp->b_datap->db_type) { + case M_FLUSH: + if (*mp->b_rptr & FLUSHW) { + *mp->b_rptr &= ~FLUSHR; + qreply(q, mp); + } else + freemsg(mp); + break; + + default: + if (mp->b_datap->db_type == M_DATA + && (proto = PPP_PROTOCOL(mp->b_rptr)) < 0x8000 + && (us = find_dest(ppa, proto)) != 0) { + /* + * A data packet for some network protocol. + * Queue it on the upper stream for that protocol. + */ + if (canput(us->q)) + putq(us->q, mp); + else + putq(q, mp); + break; + } else { + /* + * A control frame, a frame for an unknown protocol, + * or some other message type. + * Send it up to pppd via the control stream. + */ + if (mp->b_datap->db_type >= QPCTL || canputnext(ppa->q)) + putnext(ppa->q, mp); + else + putq(q, mp); + } + break; + } + + return 0; +} + +static int +ppplrsrv(q) + queue_t *q; +{ + mblk_t *mp; + struct upperstr *ppa, *us; + int proto; + + /* + * Packets only get queued here for flow control reasons. + */ + ppa = (struct upperstr *) q->q_ptr; + while ((mp = getq(q)) != 0) { + if (mp->b_datap->db_type == M_DATA + && (proto = PPP_PROTOCOL(mp->b_rptr)) < 0x8000 + && (us = find_dest(ppa, proto)) != 0) { + if (canput(us->q)) + putq(us->q, mp); + else { + putbq(q, mp); + break; + } + } else { + if (canputnext(ppa->q)) + putnext(ppa->q, mp); + else { + putbq(q, mp); + break; + } + } + } + return 0; +} diff --git a/svr4/ppp_ahdlc.c b/svr4/ppp_ahdlc.c new file mode 100644 index 0000000..2e62d21 --- /dev/null +++ b/svr4/ppp_ahdlc.c @@ -0,0 +1,592 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IFRAME_BSIZE 512 /* Block size to allocate for input */ +#define OFRAME_BSIZE 4096 /* Don't allocb more than this for output */ + +static int ahdlc_open __P((queue_t *, dev_t *, int, int, cred_t *)); +static int ahdlc_close __P((queue_t *, int, cred_t *)); +static int ahdlc_wput __P((queue_t *, mblk_t *)); +static int ahdlc_rput __P((queue_t *, mblk_t *)); +static void stuff_frame __P((queue_t *, mblk_t *)); +static void unstuff_chars __P((queue_t *, mblk_t *)); + +static struct module_info minfo = { + 0x7d23, "ppp_ahdl", 0, INFPSZ, 4096, 128 +}; + +static struct qinit rinit = { + ahdlc_rput, NULL, ahdlc_open, ahdlc_close, NULL, &minfo, NULL +}; + +static struct qinit winit = { + ahdlc_wput, NULL, NULL, NULL, NULL, &minfo, NULL +}; + +static struct streamtab ahdlc_info = { + &rinit, &winit, NULL, NULL +}; + +static struct fmodsw fsw = { + "ppp_ahdl", + &ahdlc_info, + D_NEW | D_MP | D_MTQPAIR +}; + +extern struct mod_ops mod_strmodops; + +static struct modlstrmod modlstrmod = { + &mod_strmodops, + "PPP async HDLC module", + &fsw +}; + +static struct modlinkage modlinkage = { + MODREV_1, + (void *) &modlstrmod, + NULL +}; + +struct ahdlc_state { + int flags; + mblk_t *cur_frame; + mblk_t *cur_blk; + int inlen; + ushort infcs; + u_int32_t xaccm[8]; + u_int32_t raccm; + int mtu; + int mru; +}; + +/* Values for flags */ +#define ESCAPED 1 /* last saw escape char on input */ +#define IFLUSH 2 /* flushing input due to error */ + +/* + * FCS lookup table as calculated by genfcstab. + */ +static u_short fcstab[256] = { + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + +/* + * Entry points for modloading. + */ +int +_init(void) +{ + return mod_install(&modlinkage); +} + +int +_fini(void) +{ + return mod_remove(&modlinkage); +} + +int +_info(mip) + struct modinfo *mip; +{ + return mod_info(&modlinkage, mip); +} + +/* + * STREAMS module entry points. + */ +static int +ahdlc_open(q, devp, flag, sflag, credp) + queue_t *q; + dev_t *devp; + int flag, sflag; + cred_t *credp; +{ + struct ahdlc_state *sp; + + if (q->q_ptr == 0) { + sp = (struct ahdlc_state *) kmem_zalloc(sizeof(struct ahdlc_state), + KM_SLEEP); + if (sp == 0) + return ENOSR; + q->q_ptr = sp; + WR(q)->q_ptr = sp; + sp->xaccm[0] = ~0; + sp->xaccm[3] = 0x60000000; + sp->mru = 1500; + qprocson(q); + } + return 0; +} + +static int +ahdlc_close(q, flag, credp) + queue_t *q; + int flag; + cred_t *credp; +{ + struct ahdlc_state *state; + + qprocsoff(q); + if (q->q_ptr != 0) { + state = (struct ahdlc_state *) q->q_ptr; + if (state->cur_frame != 0) { + freemsg(state->cur_frame); + state->cur_frame = 0; + } + kmem_free(q->q_ptr, sizeof(struct ahdlc_state)); + } + return 0; +} + +static int +ahdlc_wput(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct ahdlc_state *state; + struct iocblk *iop; + + state = (struct ahdlc_state *) q->q_ptr; + switch (mp->b_datap->db_type) { + case M_DATA: + /* + * A data packet - do character-stuffing and FCS, and + * send it onwards. + */ + stuff_frame(q, mp); + freemsg(mp); + break; + + case M_IOCTL: + iop = (struct iocblk *) mp->b_rptr; + switch (iop->ioc_cmd) { + case PPPIO_XACCM: + if (iop->ioc_count != sizeof(ext_accm)) + goto iocnak; + bcopy(mp->b_cont->b_rptr, (caddr_t)state->xaccm, sizeof(ext_accm)); + state->xaccm[2] &= 0x40000000; /* don't escape 0x5e */ + state->xaccm[3] |= 0x60000000; /* do escape 0x7d, 0x7e */ + goto iocack; + + case PPPIO_RACCM: + if (iop->ioc_count != sizeof(u_int32_t)) + goto iocnak; + state->raccm = *(u_int32_t *)mp->b_cont->b_rptr; + goto iocack; + + default: + putnext(q, mp); + break; + + iocack: + iop->ioc_count = 0; + mp->b_datap->db_type = M_IOCACK; + qreply(q, mp); + break; + + iocnak: + mp->b_datap->db_type = M_IOCNAK; + qreply(q, mp); + break; + } + + default: + putnext(q, mp); + } + return 0; +} + +static int +ahdlc_rput(q, mp) + queue_t *q; + mblk_t *mp; +{ + mblk_t *np; + uchar_t *cp; + struct ahdlc_state *state; + + switch (mp->b_datap->db_type) { + case M_DATA: + unstuff_chars(q, mp); + freemsg(mp); + break; + + case M_HANGUP: + state = (struct ahdlc_state *) q->q_ptr; + if (state->cur_frame != 0) { + /* XXX would like to send this up for debugging */ + freemsg(state->cur_frame); + state->cur_frame = 0; + state->cur_blk = 0; + } + state->inlen = 0; + state->flags = IFLUSH; + putnext(q, mp); + break; + + default: + putnext(q, mp); + } + return 0; +} + +/* Extract bit c from map m, to determine if c needs to be escaped. */ +#define ESCAPE(c, m) ((m)[(c) >> 5] & (1 << ((c) & 0x1f))) + +static void +stuff_frame(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct ahdlc_state *state; + int ilen, olen, c, extra; + mblk_t *omsg, *np, *op; + uchar_t *sp, *sp0, *dp, *dp0, *spend; + ushort_t fcs; + u_int32_t *xaccm, lcp_xaccm[8]; + + /* + * We estimate the length of the output packet as + * 1.25 * input length + 16 (for initial flag, FCS, final flag, slop). + */ + state = (struct ahdlc_state *) q->q_ptr; + ilen = msgdsize(mp); + olen = ilen + (ilen >> 2) + 16; + if (olen > OFRAME_BSIZE) + olen = OFRAME_BSIZE; + omsg = op = allocb(olen, BPRI_MED); + if (omsg == 0) + return; + + /* + * Put in an initial flag for now. We'll remove it later + * if we decide we don't need it. + */ + dp = op->b_wptr; + *dp++ = PPP_FLAG; + --olen; + + /* + * For LCP packets, we must escape all control characters. + */ + if (proto == PPP_LCP) { + bcopy(state->xaccm, lcp_xaccm, sizeof(lcp_xaccm)); + lcp_xaccm[0] = ~0; + xaccm = lcp_xaccm; + } else + xaccm = state->xaccm; + + sp = mp->b_rptr; + fcs = PPP_INITFCS; + for (;;) { + spend = mp->b_wptr; + extra = sp + olen - spend; + if (extra < 0) { + spend = sp + olen; + extra = 0; + } + /* + * We can safely process the input up to `spend' + * without overrunning the output, provided we don't + * hit more than `extra' characters which need to be escaped. + */ + sp0 = sp; + dp0 = dp; + while (sp < spend) { + c = *sp; + if (ESCAPE(c, xaccm)) { + if (extra > 0) + --extra; + else if (sp < spend - 1) + --spend; + else + break; + fcs = PPP_FCS(fcs, c); + *dp++ = PPP_ESCAPE; + c ^= PPP_TRANS; + } else + fcs = PPP_FCS(fcs, c); + *dp++ = c; + ++sp; + } + ilen -= sp - sp0; + olen -= dp - dp0; + + /* + * At this point, we have emptied an input block + * and/or filled an output block. + */ + if (sp >= mp->b_wptr) { + /* + * We've emptied an input block. Advance to the next. + */ + mp = mp->b_cont; + if (mp == 0) + break; /* all done */ + sp = mp->b_rptr; + } + if (olen < 2) { + /* + * The output block is full. Allocate a new one. + */ + op->b_wptr = dp; + olen = 2 * ilen + 5; + if (olen > OFRAME_BSIZE) + olen = OFRAME_BSIZE; + np = allocb(olen, BPRI_MED); + if (np == 0) { + freemsg(omsg); + return; + } + op->b_cont = np; + op = np; + dp = op->b_wptr; + } + } + + /* + * Append the FCS and closing flag. + * This could require up to 5 characters. + */ + if (olen < 5) { + /* Sigh. Need another block. */ + op->b_wptr = dp; + np = allocb(5, BPRI_MED); + if (np == 0) { + freemsg(omsg); + return; + } + op->b_cont = np; + op = np; + dp = op->b_wptr; + } + c = ~fcs & 0xff; + if (ESCAPE(c, xaccm)) { + *dp++ = PPP_ESCAPE; + c ^= PPP_TRANS; + } + *dp++ = c; + c = (~fcs >> 8) & 0xff; + if (ESCAPE(c, xaccm)) { + *dp++ = PPP_ESCAPE; + c ^= PPP_TRANS; + } + *dp++ = c; + *dp++ = PPP_FLAG; + op->b_wptr = dp; + + /* + * Remove the initial flag, if possible. + */ + if (qsize(q->q_next) > 0) + ++omsg->b_rptr; + + putnext(q, omsg); +} + +static void +unstuff_chars(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct ahdlc_state *state; + mblk_t *om; + uchar_t *cp, *cpend, *dp, *dp0; + int c, len, extra, offset; + ushort_t fcs; + + state = (struct ahdlc_state *) q->q_ptr; + cp = mp->b_rptr; + for (;;) { + /* + * Advance to next input block if necessary. + */ + if (cp >= mp->b_wptr) { + mp = mp->b_cont; + if (mp == 0) + break; + cp = mp->b_rptr; + continue; + } + + if ((state->flags & (IFLUSH|ESCAPED)) == 0 + && state->inlen >= PPP_HDRLEN + && (om = state->cur_blk) != 0) { + /* + * Process bulk chars as quickly as possible. + */ + dp = om->b_wptr; + len = om->b_datap->db_lim - dp; /* max # output bytes */ + extra = (cpend - cp) - len; /* #input chars - #output bytes */ + if (extra < 0) { + len += extra; /* we'll run out of input first */ + extra = 0; + } + cpend = cp + len; + dp0 = dp; + fcs = state->infcs; + while (cp < cpend) { + c = *cp; + if (c == PPP_FLAG) + break; + ++cp; + if (c == PPP_ESCAPE) { + if (extra > 0) + --extra; + else if (len > 1) + --len; + else { + state->flags |= ESCAPED; + break; + } + c = *cp; + if (c == PPP_FLAG) + break; + ++cp; + c ^= PPP_TRANS; + } + *dp++ = c; + fcs = PPP_FCS(fcs, c); + } + state->inlen += dp - dp0; + state->infcs = fcs; + om->b_wptr = dp; + if (len <= 0) + continue; /* go back and check cp again */ + } + + c = *cp++; + if (c == PPP_FLAG) { + /* + * End of a frame. + * If the ESCAPE flag is set, the frame ended with + * the frame abort sequence "}~". + */ + om = state->cur_frame; + len = state->inlen; + state->cur_frame = 0; + state->inlen = 0; + if (om == 0) + continue; + if (state->flags & (IFLUSH|ESCAPED) || len < PPP_FCSLEN) { + /* XXX should send up ctl message to notify VJ decomp */ + freemsg(om); + continue; + } + if (state->infcs != PPP_GOODFCS) { + /* incr bad fcs stats */ + /* would like to be able to pass this up for debugging */ + /* XXX should send up ctl message to notify VJ decomp */ + freemsg(om); + continue; + } + adjmsg(om, -PPP_FCSLEN); /* chop off fcs */ + putnext(q, om); /* bombs away! */ + continue; + } + + if (state->flags & IFLUSH) + continue; + if (state->flags & ESCAPED) { + c ^= PPP_TRANS; + } else if (c == PPP_ESCAPE) { + state->flags |= ESCAPED; + continue; + } + if (state->inlen == 0) { + /* + * First byte of the frame: allocate the first message block. + */ + om = allocb(IFRAME_BSIZE, BPRI_MED); + if (om == 0) { + state->flags |= IFLUSH; + continue; + } + state->cur_frame = om; + state->cur_blk = om; + state->infcs = PPP_INITFCS; + } else { + om = state->cur_blk; + if (om->b_wptr >= om->b_datap->db_lim) { + /* + * Current message block is full. Allocate another one. + */ + om = allocb(IFRAME_BSIZE, BPRI_MED); + if (om == 0) { + freemsg(state->cur_frame); + state->flags |= IFLUSH; + continue; + } + state->cur_blk->b_cont = om; + state->cur_blk = om; + } + } + *om->b_wptr++ = c; + ++state->inlen; + state->infcs = PPP_FCS(state->infcs, c); + + if (state->inlen == PPP_HDRLEN) { + /* + * We don't do address/control & protocol decompression here, + * but we do leave space for the decompressed fields and + * arrange for the info field to start on a word boundary. + */ + cp = om->b_rptr; + if (*cp == PPP_ALLSTATIONS) + cp += 2; + if ((*cp & 1) == 0) + ++cp; + /* cp is now pointing at the last byte of the ppp protocol field */ + offset = 3 - ((unsigned)cp & 3); + if (offset > 0) { + do { + cp[offset] = cp[0]; + --cp; + } while (cp >= om->b_rptr); + om->b_rptr += offset; + om->b_wptr += offset; + } + } + } +} + diff --git a/svr4/ppp_comp.c b/svr4/ppp_comp.c new file mode 100644 index 0000000..254a935 --- /dev/null +++ b/svr4/ppp_comp.c @@ -0,0 +1,550 @@ +/* + * ppp_comp.c - STREAMS module for kernel-level CCP support. + * + * Copyright (c) 1994 The Australian National University. + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation is hereby granted, provided that the above copyright + * notice appears in all copies. This software is provided without any + * warranty, express or implied. The Australian National University + * makes no representations about the suitability of this software for + * any purpose. + * + * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY + * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF + * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO + * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, + * OR MODIFICATIONS. + * + * $Id: ppp_comp.c,v 1.1 1995/05/10 01:38:47 paulus Exp $ + */ + +/* + * This file is used under SunOS 4.x, and OSF/1 on DEC Alpha. + * + * Beware that under OSF/1, the ioctl constants (SIOC*) end up + * as 64-bit (long) values, so an ioctl constant should be cast to + * int (32 bits) before being compared with the ioc_cmd field of + * an iocblk structure. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ALLOCATE(n) kmem_zalloc((n), KM_NOSLEEP) +#define FREE(p, n) kmem_free((p), (n)) + +#define PACKETPTR mblk_t * +#include + +static int ppp_comp_open __P((queue_t *, dev_t *, int, int, cred_t *)); +static int ppp_comp_close __P((queue_t *, int, cred_t *)); +static int ppp_comp_rput __P((queue_t *, mblk_t *)); +static int ppp_comp_wput __P((queue_t *, mblk_t *)); +static void ppp_comp_ccp __P((queue_t *, mblk_t *, int)); + +static struct module_info minfo = { + 0xbadf, "ppp_compress", 0, INFPSZ, 16384, 4096, +}; + +static struct qinit r_init = { + ppp_comp_rput, NULL, ppp_comp_open, ppp_comp_close, + NULL, &minfo, NULL +}; + +static struct qinit w_init = { + ppp_comp_wput, NULL, NULL, NULL, NULL, &minfo, NULL +}; + +static struct streamtab ppp_compinfo = { + &r_init, &w_init, NULL, NULL +}; + +static struct fmodsw fsw = { + "ppp_comp", + &ppp_compinfo, + D_NEW | D_MP | D_MTQPAIR +}; + +extern struct mod_ops mod_strmodops; + +static struct modlstrmod modlstrmod = { + &mod_strmodops, + "PPP compression module", + &fsw +}; + +static struct modlinkage modlinkage = { + MODREV_1, + (void *) &modlstrmod, + NULL +}; + +struct ppp_comp_state { + int flags; + int mru; + int mtu; + struct compressor *xcomp; + void *xstate; + struct compressor *rcomp; + void *rstate; + struct vjcompress vj_comp; +}; + +/* Bits in flags are as defined in pppio.h. */ +#define CCP_ERR (CCP_ERROR | CCP_FATALERROR) + +#define MAX_IPHDR 128 /* max TCP/IP header size */ +#define MAX_VJHDR 20 /* max VJ compressed header size (?) */ + +/* + * List of compressors we know about. + */ + +extern struct compressor ppp_bsd_compress; + +struct compressor *ppp_compressors[] = { +#if DO_BSD_COMPRESS + &ppp_bsd_compress, +#endif + NULL +}; + +/* + * Entry points for modloading. + */ +int +_init(void) +{ + return mod_install(&modlinkage); +} + +int +_fini(void) +{ + return mod_remove(&modlinkage); +} + +int +_info(mip) + struct modinfo *mip; +{ + return mod_info(&modlinkage, mip); +} + +/* + * STREAMS module entry points. + */ +static int +ppp_comp_open(q, dev, flag, sflag, credp) + queue_t *q; + dev_t dev; + int flag, sflag; + cred_t *credp; +{ + struct ppp_comp_state *cp; + + if (q->q_ptr == NULL) { + cp = (struct ppp_comp_state *) ALLOCATE(sizeof(struct ppp_comp_state)); + if (cp == NULL) + return ENOSR; + OTHERQ(q)->q_ptr = q->q_ptr = cp; + cp->flags = 0; + cp->mru = PPP_MRU; + cp->xstate = NULL; + cp->rstate = NULL; + } + return 0; +} + +static int +ppp_comp_close(q) + queue_t *q; +{ + struct ppp_comp_state *cp; + + cp = (struct ppp_comp_state *) q->q_ptr; + if (cp != NULL) { + if (cp->xstate != NULL) + (*cp->xcomp->comp_free)(cp->xstate); + if (cp->rstate != NULL) + (*cp->rcomp->decomp_free)(cp->rstate); + FREE(cp, sizeof(struct ppp_comp_state)); + q->q_ptr = NULL; + OTHERQ(q)->q_ptr = NULL; + } + return 0; +} + +static int +ppp_comp_wput(q, mp) + queue_t *q; + mblk_t *mp; +{ + struct iocblk *iop; + struct ppp_comp_state *cp; + mblk_t *cmp; + int error, len, proto, state; + struct ppp_option_data *odp; + struct compressor **comp; + struct ppp_comp_stats *pcp; + + cp = (struct ppp_comp_state *) q->q_ptr; + switch (mp->b_datap->db_type) { + + case M_DATA: + /* first find out what the protocol is */ + if (mp->b_wptr - mp->b_rptr < PPP_HDRLEN + && !pullupmsg(mp, PPP_HDRLEN)) { + freemsg(mp); /* give up on it */ + break; + } + proto = PPP_PROTOCOL(mp->b_rptr); + + /* + * Do VJ compression if requested. + */ + if (proto == PPP_IP && (cp->flags & COMP_VJC)) { + len = msgdsize(mp); + if (len > MAX_IPHDR + PPP_HDRLEN) + len = MAX_IPHDR + PPP_HDRLEN; + if (mp->b_wptr - mp->b_rptr >= len || pullupmsg(mp, len)) { + ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN); + if (ip->ip_p == IPPROTO_TCP) { + type = vj_compress_tcp(ip, len - PPP_HDRLEN, + cp->vj_comp, (cp->flags & COMP_VJCCID), + &vjhdr); + switch (type) { + case TYPE_UNCOMPRESSED_TCP: + mp->b_rptr[3] = proto = PPP_VJC_UNCOMP; + break; + case TYPE_COMPRESSED_TCP: + dp = vjhdr - PPP_HDRLEN; + dp[1] = mp->b_rptr[1]; /* copy control field */ + dp[0] = mp->b_rptr[0]; /* copy address field */ + dp[2] = 0; /* set protocol field */ + dp[3] = proto = PPP_VJC_COMP; + mp->b_rptr = dp; + break; + } + } + } + } + + /* + * Do packet compression if enabled. + */ + if (proto == PPP_CCP) + ppp_comp_ccp(q, mp, 0); + else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN) + && cp->xstate != NULL) { + len = msgdsize(mp); + (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len, + (cp->flags & CCP_ISUP? cp->mtu: 0)); + if (cmp != NULL) { + freemsg(mp); + mp = cmp; + } + } + + /* + * Do address/control and protocol compression if enabled. + */ + if (proto != PPP_LCP && (cp->flags & COMP_AC)) { + mp->b_rptr += 2; /* drop the address & ctrl fields */ + if (proto < 0x100 && (cp->flags & COMP_PROT)) + ++mp->b_rptr; /* drop the high protocol byte */ + } else if (proto < 0x100 && (cp->flags & COMP_PROT)) { + /* shuffle up the address & ctrl fields */ + mp->b_rptr[2] = mp->b_rptr[1]; + mp->b_rptr[1] = mp->b_rptr[0]; + ++mp->b_rptr; + } + + putnext(q, mp); + break; + + case M_IOCTL: + iop = (struct iocblk *) mp->b_rptr; + error = -1; + switch (iop->ioc_cmd) { + + case PPPIO_CFLAGS: + /* set CCP state */ + if (iop->ioc_count != sizeof(int)) { + error = EINVAL; + break; + } + state = (*(int *) mp->b_cont->b_rptr) & (CCP_ISUP | CCP_ISOPEN); + if ((state & CCP_ISOPEN) == 0) { + if (cp->xstate != NULL) { + (*cp->xcomp->comp_free)(cp->xstate); + cp->xstate = NULL; + } + if (cp->rstate != NULL) { + (*cp->rcomp->decomp_free)(cp->rstate); + cp->rstate = NULL; + } + cp->flags = 0; + } else { + cp->flags = (cp->flags & ~CCP_ISUP) | state; + } + error = 0; + iop->ioc_count = 0; + break; + + case SIOCGIFCOMP: + if ((mp->b_cont = allocb(sizeof(int), BPRI_MED)) == NULL) { + error = ENOSR; + break; + } + *(int *)mp->b_cont->b_wptr = cp->flags; + mp->b_cont->b_wptr += iop->ioc_count = sizeof(int); + break; + + case PPPIO_COMPRESS: + error = EINVAL; + if (iop->ioc_count != sizeof(struct ppp_option_data)) + break; + odp = (struct ppp_option_data *) mp->b_cont->b_rptr; + len = mp->b_cont->b_wptr - (unsigned char *) odp->opt_data; + if (len > odp->length) + len = odp->length; + if (odp->opt_data[1] < 2 || odp->opt_data[1] > len) + break; + for (comp = ppp_compressors; *comp != NULL; ++comp) + if ((*comp)->compress_proto == odp->opt_data[0]) { + /* here's the handler! */ + error = 0; + if (odp->transmit) { + if (cp->xstate != NULL) + (*cp->xcomp->comp_free)(cp->xstate); + cp->xcomp = *comp; + cp->xstate = (*comp)->comp_alloc(odp->opt_data, len); + if (cp->xstate == NULL) + error = ENOSR; + } else { + if (cp->rstate != NULL) + (*cp->rcomp->decomp_free)(cp->rstate); + cp->rcomp = *comp; + cp->rstate = (*comp)->decomp_alloc(odp->opt_data, len); + if (cp->rstate == NULL) + error = ENOSR; + } + break; + } + iop->ioc_count = 0; + break; + + case PPPIO_MRU: + /* remember this value */ + if (iop->ioc_count == sizeof(int)) { + cp->mru = *(int *) mp->b_cont->b_rptr; + } + break; + + } + + if (error < 0) + putnext(q, mp); + else if (error == 0) { + mp->b_datap->db_type = M_IOCACK; + qreply(q, mp); + } else { + mp->b_datap->db_type = M_IOCNAK; + iop->ioc_count = 0; + qreply(q, mp); + } + break; + + default: + putnext(q, mp); + } +} + +static int +ppp_comp_rput(q, mp) + queue_t *q; + mblk_t *mp; +{ + int proto, rv; + mblk_t *dmp; + struct ppp_comp_state *cp; + + cp = (struct ppp_comp_state *) q->q_ptr; + switch (mp->b_datap->db_type) { + + case M_DATA: + /* + * First do address/control and protocol "decompression". + */ + len = msgdsize(mp); + if (len > PPP_HDRLEN) + len = PPP_HDRLEN; + if (mp->b_wptr - mp->b_rptr < len && !pullupmsg(mp, len)) { + /* XXX reset VJ */ + freemsg(mp); + break; + } + dp = mp->b_rptr; + if (PPP_ADDRESS(dp) == PPP_ALLSTATIONS && PPP_CONTROL(dp) == PPP_UI) + dp += 2; /* skip address/control */ + proto = 0; + if ((dp[0] & 1) == 0) + proto = *dp++ << 8; /* grab high byte of protocol */ + proto += *dp++; /* grab low byte of protocol */ + if (dp > mp->b_wptr) { + freemsg(mp); /* short/bogus packet */ + break; + } + if ((dp -= PPP_HDRLEN) < mp->b_datap->db_base) { + /* yucko, need a new message block */ + mp->b_rptr = dp; + np = allocb(PPP_HDRLEN, BPRI_MED); + if (np == 0) { + freemsg(mp); + break; + } + linkb(np, mp); + mp = np; + dp = mp->b_rptr; + mp->b_wptr = dp + PPP_HDRLEN; + } else + mp->b_rptr = dp; + dp[0] = PPP_ALLSTATIONS; + dp[1] = PPP_UI; + dp[2] = proto >> 8; + dp[3] = proto; + + /* + * Now see if we have a compressed packet to decompress, + * or a CCP packet to take notice of. + */ + proto = PPP_PROTOCOL(mp->b_rptr); + if (proto == PPP_CCP) + ppp_comp_ccp(q, mp, 1); + else if (proto == PPP_COMP) { + if ((cp->flags & CCP_ISUP) + && (cp->flags & CCP_DECOMP_RUN) && cp->rstate + && (cp->flags & CCP_ERR) == 0) { + rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp); + if (dmp != NULL) { + freemsg(mp); + mp = dmp; + } else { + switch (rv) { + case DECOMP_OK: + /* no error, but no packet returned */ + freemsg(mp); + mp = NULL; + break; + case DECOMP_ERROR: + cp->flags |= CCP_ERROR; + break; + case DECOMP_FATALERROR: + cp->flags |= CCP_FATALERROR; + break; + } + } + } + } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) { + (*cp->rcomp->incomp)(cp->rstate, mp); + } + + /* + * Now do VJ decompression. + */ + + if (mp != NULL) + putnext(q, mp); + break; + + default: + putnext(q, mp); + } +} + +/* + * Handle a CCP packet being sent or received. + */ +static void +ppp_comp_ccp(q, mp, rcvd) + queue_t *q; + mblk_t *mp; + int rcvd; +{ + int len, clen; + struct ppp_comp_state *cp; + unsigned char *dp; + + len = msgdsize(mp); + if (len < PPP_HDRLEN + CCP_HDRLEN || !pullupmsg(mp, len)) + return; + cp = (struct ppp_comp_state *) q->q_ptr; + dp = mp->b_rptr + PPP_HDRLEN; + len -= PPP_HDRLEN; + clen = CCP_LENGTH(dp); + if (clen > len) + return; + + switch (CCP_CODE(dp)) { + case CCP_CONFREQ: + case CCP_TERMREQ: + case CCP_TERMACK: + cp->flags &= ~CCP_ISUP; + break; + + case CCP_CONFACK: + if ((cp->flags & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN + && clen >= CCP_HDRLEN + CCP_OPT_MINLEN + && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) { + if (!rcvd) { + if (cp->xstate != NULL + && (*cp->xcomp->comp_init) + (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN, + 0, /* XXX: should be unit */ 0, 0)) + cp->flags |= CCP_COMP_RUN; + } else { + if (cp->rstate != NULL + && (*cp->rcomp->decomp_init) + (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN, + 0/* unit */, 0, cp->mru, 0)) + cp->flags = (cp->flags & ~CCP_ERR) + | CCP_DECOMP_RUN; + } + } + break; + + case CCP_RESETACK: + if (cp->flags & CCP_ISUP) { + if (!rcvd) { + if (cp->xstate && (cp->flags & CCP_COMP_RUN)) + (*cp->xcomp->comp_reset)(cp->xstate); + } else { + if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) { + (*cp->rcomp->decomp_reset)(cp->rstate); + cp->flags &= ~CCP_ERROR; + } + } + } + break; + } + +}