/* $NetBSD: if_pppoe.c,v 1.21 2002/02/10 15:13:43 martin Exp $ */ /* * Copyright (c) 2001 Martin Husemann. 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * */ #include __KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.21 2002/02/10 15:13:43 martin Exp $"); #include "pppoe.h" #include "bpfilter.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NBPFILTER > 0 #include #endif #include #undef PPPOE_DEBUG /* XXX - remove this or make it an option */ /* #define PPPOE_DEBUG 1 */ #define PPPOE_HEADERLEN 6 #define PPPOE_VERTYPE 0x11 /* VER=1, TYPE = 1 */ #define PPPOE_TAG_EOL 0x0000 /* end of list */ #define PPPOE_TAG_SNAME 0x0101 /* service name */ #define PPPOE_TAG_ACNAME 0x0102 /* access concentrator name */ #define PPPOE_TAG_HUNIQUE 0x0103 /* host unique */ #define PPPOE_TAG_ACCOOKIE 0x0104 /* AC cookie */ #define PPPOE_TAG_VENDOR 0x0105 /* vendor specific */ #define PPPOE_TAG_RELAYSID 0x0110 /* relay session id */ #define PPPOE_TAG_SNAME_ERR 0x0201 /* service name error */ #define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */ #define PPPOE_TAG_GENERIC_ERR 0x0203 /* gerneric error */ #define PPPOE_CODE_PADI 0x09 /* Active Discovery Initiation */ #define PPPOE_CODE_PADO 0x07 /* Active Discovery Offer */ #define PPPOE_CODE_PADR 0x19 /* Active Discovery Request */ #define PPPOE_CODE_PADS 0x65 /* Active Discovery Session confirmation */ #define PPPOE_CODE_PADT 0xA7 /* Active Discovery Terminate */ /* two byte PPP protocol discriminator, then IP data */ #define PPPOE_MAXMTU (ETHERMTU-PPPOE_HEADERLEN-2) /* Read a 16 bit unsigned value from a buffer */ #define PPPOE_READ_16(PTR, VAL) \ (VAL) = ((PTR)[0] << 8) | (PTR)[1]; \ (PTR)+=2 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */ #define PPPOE_ADD_16(PTR, VAL) \ *(PTR)++ = (VAL) / 256; \ *(PTR)++ = (VAL) % 256 /* Add a complete PPPoE header to the buffer pointed to by PTR */ #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \ *(PTR)++ = PPPOE_VERTYPE; \ *(PTR)++ = (CODE); \ PPPOE_ADD_16(PTR, SESS); \ PPPOE_ADD_16(PTR, LEN) #define PPPOE_DISC_TIMEOUT (hz*5) /* base for quick timeout calculation */ #define PPPOE_SLOW_RETRY (hz*60) /* persistent retry interval */ #define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */ #define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */ struct pppoe_softc { struct sppp sc_sppp; /* contains a struct ifnet as first element */ LIST_ENTRY(pppoe_softc) sc_list; struct ifnet *sc_eth_if; /* ethernet interface we are using */ int sc_state; /* discovery phase or session connected */ struct ether_addr sc_dest; /* hardware address of concentrator */ u_int16_t sc_session; /* PPPoE session id */ char *sc_service_name; /* if != NULL: requested name of service */ char *sc_concentrator_name; /* if != NULL: requested concentrator id */ u_int8_t *sc_ac_cookie; /* content of AC cookie we must echo back */ size_t sc_ac_cookie_len; /* length of cookie data */ struct callout sc_timeout; /* timeout while not in session state */ int sc_padi_retried; /* number of PADI retries already done */ int sc_padr_retried; /* number of PADR retries already done */ }; /* incoming traffic will be queued here */ struct ifqueue ppoediscinq = { NULL }; struct ifqueue ppoeinq = { NULL }; #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS void * pppoe_softintr = NULL; static void pppoe_softintr_handler(void *); #else struct callout pppoe_softintr = CALLOUT_INITIALIZER; void pppoe_softintr_handler(void*); #endif extern int sppp_ioctl(struct ifnet *ifp, unsigned long cmd, void *data); /* input routines */ static void pppoe_input(void); static void pppoe_disc_input(struct mbuf *m); static void pppoe_dispatch_disc_pkt(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh); static void pppoe_data_input(struct mbuf *m); /* management routines */ void pppoeattach(int count); static int pppoe_connect(struct pppoe_softc *sc); static int pppoe_disconnect(struct pppoe_softc *sc); static void pppoe_abort_connect(struct pppoe_softc *sc); static int pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data); static void pppoe_tls(struct sppp *sp); static void pppoe_tlf(struct sppp *sp); static void pppoe_start(struct ifnet *ifp); /* internal timeout handling */ static void pppoe_timeout(void*); /* sending actual protocol controll packets */ static int pppoe_send_padi(struct pppoe_softc *sc); static int pppoe_send_padr(struct pppoe_softc *sc); static int pppoe_send_padt(struct pppoe_softc *sc); /* raw output */ static int pppoe_output(struct pppoe_softc *sc, struct mbuf *m); /* internal helper functions */ static struct pppoe_softc * pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif); static struct pppoe_softc * pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif); LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list; int pppoe_clone_create __P((struct if_clone *, int)); void pppoe_clone_destroy __P((struct ifnet *)); struct if_clone pppoe_cloner = IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy); /* ARGSUSED */ void pppoeattach(count) int count; { LIST_INIT(&pppoe_softc_list); if_clone_attach(&pppoe_cloner); ppoediscinq.ifq_maxlen = IFQ_MAXLEN; ppoeinq.ifq_maxlen = IFQ_MAXLEN; #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS pppoe_softintr = softintr_establish(IPL_SOFTNET, pppoe_softintr_handler, NULL); #endif } int pppoe_clone_create(ifc, unit) struct if_clone *ifc; int unit; { struct pppoe_softc *sc; sc = malloc(sizeof(struct pppoe_softc), M_DEVBUF, M_WAITOK); memset(sc, 0, sizeof(struct pppoe_softc)); sprintf(sc->sc_sppp.pp_if.if_xname, "pppoe%d", unit); sc->sc_sppp.pp_if.if_softc = sc; sc->sc_sppp.pp_if.if_mtu = PPPOE_MAXMTU; sc->sc_sppp.pp_if.if_flags = IFF_SIMPLEX|IFF_POINTOPOINT|IFF_MULTICAST; sc->sc_sppp.pp_if.if_type = IFT_PPP; sc->sc_sppp.pp_if.if_hdrlen = sizeof(struct ether_header)+PPPOE_HEADERLEN; sc->sc_sppp.pp_if.if_dlt = DLT_PPP_ETHER; sc->sc_sppp.pp_flags |= PP_KEEPALIVE| /* use LCP keepalive */ PP_NOFRAMING; /* no serial encapsulation */ sc->sc_sppp.pp_if.if_ioctl = pppoe_ioctl; IFQ_SET_MAXLEN(&sc->sc_sppp.pp_if.if_snd, IFQ_MAXLEN); IFQ_SET_READY(&sc->sc_sppp.pp_if.if_snd); /* changed to real address later */ memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); callout_init(&sc->sc_timeout); sc->sc_sppp.pp_if.if_start = pppoe_start; sc->sc_sppp.pp_tls = pppoe_tls; sc->sc_sppp.pp_tlf = pppoe_tlf; sc->sc_sppp.pp_framebytes = PPPOE_HEADERLEN; /* framing added to ppp packets */ if_attach(&sc->sc_sppp.pp_if); sppp_attach(&sc->sc_sppp.pp_if); #if NBPFILTER > 0 bpfattach(&sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0); #endif LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list); return 0; } void pppoe_clone_destroy(ifp) struct ifnet *ifp; { struct pppoe_softc * sc = ifp->if_softc; LIST_REMOVE(sc, sc_list); #if NBPFILTER > 0 bpfdetach(ifp); #endif sppp_detach(&sc->sc_sppp.pp_if); if_detach(ifp); free(sc, M_DEVBUF); } /* * Find the interface handling the specified session. * Note: O(number of sessions open), this is a client-side only, mean * and lean implementation, so number of open sessions typically should * be 1. */ static struct pppoe_softc * pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif) { struct pppoe_softc *sc; if (session == 0) return NULL; LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { if (sc->sc_state == PPPOE_STATE_SESSION && sc->sc_session == session) { if (sc->sc_eth_if == rcvif) return sc; else return NULL; } } return NULL; } /* Check host unique token passed and return appropriate softc pointer, * or NULL if token is bogus. */ static struct pppoe_softc * pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif) { struct pppoe_softc *sc, *t; if (LIST_EMPTY(&pppoe_softc_list)) return NULL; if (len != sizeof sc) return NULL; memcpy(&t, token, len); LIST_FOREACH(sc, &pppoe_softc_list, sc_list) if (sc == t) break; if (sc != t) { #ifdef PPPOE_DEBUG printf("pppoe: alien host unique tag, no session found\n"); #endif return NULL; } /* should be safe to access *sc now */ if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) { printf("%s: host unique tag found, but it belongs to a connection in state %d\n", sc->sc_sppp.pp_if.if_xname, sc->sc_state); return NULL; } if (sc->sc_eth_if != rcvif) { printf("%s: wrong interface, not accepting host unique\n", sc->sc_sppp.pp_if.if_xname); return NULL; } return sc; } #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS static void pppoe_softintr_handler(void *dummy) { /* called at splsoftnet() */ pppoe_input(); } #else void pppoe_softintr_handler(void *dummy) { int s = splnet(); pppoe_input(); callout_deactivate(&pppoe_softintr); splx(s); } #endif /* called at appropriate protection level */ static void pppoe_input() { struct mbuf *m; int s, disc_done, data_done; do { disc_done = 0; data_done = 0; for (;;) { s = splnet(); IF_DEQUEUE(&ppoediscinq, m); splx(s); if (m == NULL) break; disc_done = 1; pppoe_disc_input(m); } for (;;) { s = splnet(); IF_DEQUEUE(&ppoeinq, m); splx(s); if (m == NULL) break; data_done = 1; pppoe_data_input(m); } } while (disc_done || data_done); } /* analyze and handle a single received packet while not in session state */ static void pppoe_dispatch_disc_pkt(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh) { u_int16_t tag, len; u_int8_t vertype, code; u_int16_t session, plen; struct pppoe_softc *sc; const char *err_msg = NULL; u_int8_t * ac_cookie; size_t ac_cookie_len; ac_cookie = NULL; ac_cookie_len = 0; session = 0; if (size <= PPPOE_HEADERLEN) { printf("pppoe: packet too short: %ld\n", (long)size); return; } vertype = *p++; if (vertype != PPPOE_VERTYPE) { printf("pppoe: unknown version/type packet: 0x%x\n", vertype); return; } code = *p++; PPPOE_READ_16(p, session); PPPOE_READ_16(p, plen); size -= PPPOE_HEADERLEN; if (plen > size) { printf("pppoe: packet content does not fit: data available = %ld, packet size = %ld\n", (long)size, (long)plen); return; } size = plen; /* ignore trailing garbage */ tag = 0; len = 0; sc = NULL; while (size > 4) { PPPOE_READ_16(p, tag); PPPOE_READ_16(p, len); if (len > size) { printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len); return; } switch (tag) { case PPPOE_TAG_EOL: size = 0; break; case PPPOE_TAG_SNAME: break; /* ignored */ case PPPOE_TAG_ACNAME: break; /* ignored */ case PPPOE_TAG_HUNIQUE: if (sc == NULL) sc = pppoe_find_softc_by_hunique(p, len, rcvif); break; case PPPOE_TAG_ACCOOKIE: if (ac_cookie == NULL) { ac_cookie = p; ac_cookie_len = len; } break; case PPPOE_TAG_SNAME_ERR: err_msg = "SERVICE NAME ERROR"; break; case PPPOE_TAG_ACSYS_ERR: err_msg = "AC SYSTEM ERROR"; break; case PPPOE_TAG_GENERIC_ERR: err_msg = "GENERIC ERROR"; break; } if (err_msg) { printf("%s: %s\n", sc? sc->sc_sppp.pp_if.if_xname : "pppoe", err_msg); return; } if (size >= 0) { size -= 4 + len; if (len > 0) p += len; } } switch (code) { case PPPOE_CODE_PADI: case PPPOE_CODE_PADR: /* ignore, we are no access concentrator */ return; case PPPOE_CODE_PADO: if (sc == NULL) { printf("pppoe: received PADO but could not find request for it\n"); return; } if (sc->sc_state != PPPOE_STATE_PADI_SENT) { printf("%s: received unexpected PADO\n", sc->sc_sppp.pp_if.if_xname); return; } if (ac_cookie) { sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF, M_DONTWAIT); if (sc->sc_ac_cookie == NULL) return; sc->sc_ac_cookie_len = ac_cookie_len; memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len); } memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest); callout_stop(&sc->sc_timeout); sc->sc_padr_retried = 0; sc->sc_state = PPPOE_STATE_PADR_SENT; if (pppoe_send_padr(sc) == 0) callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc); else pppoe_abort_connect(sc); break; case PPPOE_CODE_PADS: if (sc == NULL) return; sc->sc_session = session; callout_stop(&sc->sc_timeout); if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG) printf("%s: session 0x%x connected\n", sc->sc_sppp.pp_if.if_xname, session); sc->sc_state = PPPOE_STATE_SESSION; sc->sc_sppp.pp_up(&sc->sc_sppp); /* notify upper layers */ break; case PPPOE_CODE_PADT: if (sc == NULL) return; /* stop timer (we might be about to transmit a PADT ourself) */ callout_stop(&sc->sc_timeout); if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG) printf("%s: session 0x%x terminated, received PADT\n", sc->sc_sppp.pp_if.if_xname, session); /* clean up softc */ sc->sc_state = PPPOE_STATE_INITIAL; memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); if (sc->sc_ac_cookie) { free(sc->sc_ac_cookie, M_MBUF); sc->sc_ac_cookie = NULL; } sc->sc_ac_cookie_len = 0; sc->sc_session = 0; /* signal upper layer */ sc->sc_sppp.pp_down(&sc->sc_sppp); break; default: printf("%s: unknown code (0x%04x) session = 0x%04x\n", sc? sc->sc_sppp.pp_if.if_xname : "pppoe", code, session); break; } } static void pppoe_disc_input(struct mbuf *m) { u_int8_t *p; struct ether_header *eh; eh = mtod(m, struct ether_header*); m_adj(m, sizeof(struct ether_header)); p = mtod(m, u_int8_t*); KASSERT(m->m_flags & M_PKTHDR); pppoe_dispatch_disc_pkt(p, m->m_len, m->m_pkthdr.rcvif, eh); m_free(m); } static void pppoe_data_input(struct mbuf *m) { u_int8_t *p, vertype; u_int16_t session, plen, code; struct pppoe_softc *sc; KASSERT(m->m_flags & M_PKTHDR); m_adj(m, sizeof(struct ether_header)); if (m->m_pkthdr.len <= PPPOE_HEADERLEN) { printf("pppoe (data): dropping too short packet: %ld bytes\n", (long)m->m_pkthdr.len); goto drop; } p = mtod(m, u_int8_t*); vertype = *p++; if (vertype != PPPOE_VERTYPE) { printf("pppoe (data): unknown version/type packet: 0x%x\n", vertype); goto drop; } code = *p++; if (code != 0) goto drop; PPPOE_READ_16(p, session); sc = pppoe_find_softc_by_session(session, m->m_pkthdr.rcvif); if (sc == NULL) goto drop; PPPOE_READ_16(p, plen); #if NBPFILTER > 0 if(sc->sc_sppp.pp_if.if_bpf) bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m); #endif m_adj(m, PPPOE_HEADERLEN); #ifdef PPPOE_DEBUG { struct mbuf *p; printf("%s: pkthdr.len=%d, pppoe.len=%d", sc->sc_sppp.pp_if.if_xname, m->m_pkthdr.len, plen); p = m; while (p) { printf(" l=%d", p->m_len); p = p->m_next; } printf("\n"); } #endif if (m->m_pkthdr.len < plen) goto drop; /* fix incoming interface pointer (not the raw ethernet interface anymore) */ m->m_pkthdr.rcvif = &sc->sc_sppp.pp_if; /* pass packet up and account for it */ sc->sc_sppp.pp_if.if_ipackets++; sppp_input(&sc->sc_sppp.pp_if, m); return; drop: m_free(m); } static int pppoe_output(struct pppoe_softc *sc, struct mbuf *m) { struct sockaddr dst; struct ether_header *eh; u_int16_t etype; if (sc->sc_eth_if == NULL) return EIO; memset(&dst, 0, sizeof dst); dst.sa_family = AF_UNSPEC; eh = (struct ether_header*)&dst.sa_data; etype = sc->sc_state == PPPOE_STATE_SESSION? ETHERTYPE_PPPOE : ETHERTYPE_PPPOEDISC; eh->ether_type = htons(etype); memcpy(&eh->ether_dhost, &sc->sc_dest, sizeof sc->sc_dest); #ifdef PPPOE_DEBUG printf("%s (%x) state=%d, session=0x%x output -> %s, len=%d\n", sc->sc_sppp.pp_if.if_xname, etype, sc->sc_state, sc->sc_session, ether_sprintf((const unsigned char *)&sc->sc_dest), m->m_pkthdr.len); #endif sc->sc_sppp.pp_if.if_opackets++; return sc->sc_eth_if->if_output(sc->sc_eth_if, m, &dst, NULL); } static int pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data) { struct proc *p = curproc; /* XXX */ struct pppoe_softc *sc = (struct pppoe_softc*)ifp; int error = 0; switch (cmd) { case PPPOESETPARMS: { struct pppoediscparms *parms = (struct pppoediscparms*)data; if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return error; if (parms->eth_ifname[0] != 0) { sc->sc_eth_if = ifunit(parms->eth_ifname); if (sc->sc_eth_if == NULL) return ENXIO; } if (parms->ac_name) { size_t s; char * p = malloc(parms->ac_name_len + 1, M_DEVBUF, M_WAITOK); copyinstr(parms->ac_name, p, parms->ac_name_len, &s); if (sc->sc_concentrator_name) free(sc->sc_concentrator_name, M_DEVBUF); sc->sc_concentrator_name = p; } if (parms->service_name) { size_t s; char * p = malloc(parms->service_name_len + 1, M_DEVBUF, M_WAITOK); copyinstr(parms->service_name, p, parms->service_name_len, &s); if (sc->sc_service_name) free(sc->sc_service_name, M_DEVBUF); sc->sc_service_name = p; } return 0; } break; case PPPOEGETPARMS: { struct pppoediscparms *parms = (struct pppoediscparms*)data; memset(parms, 0, sizeof *parms); if (sc->sc_eth_if) strncpy(parms->ifname, sc->sc_eth_if->if_xname, IFNAMSIZ); return 0; } break; case PPPOEGETSESSION: { struct pppoeconnectionstate *state = (struct pppoeconnectionstate*)data; state->state = sc->sc_state; state->session_id = sc->sc_session; state->padi_retry_no = sc->sc_padi_retried; state->padr_retry_no = sc->sc_padr_retried; return 0; } break; case SIOCSIFFLAGS: { struct ifreq *ifr = (struct ifreq*) data; /* * Prevent running re-establishment timers overriding * administrators choice. */ if ((ifr->ifr_flags & IFF_UP) == 0 && sc->sc_state >= PPPOE_STATE_PADI_SENT && sc->sc_state < PPPOE_STATE_SESSION) { callout_stop(&sc->sc_timeout); sc->sc_state = PPPOE_STATE_INITIAL; sc->sc_padi_retried = 0; sc->sc_padr_retried = 0; memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); } return sppp_ioctl(ifp, cmd, data); } case SIOCSIFMTU: { struct ifreq *ifr = (struct ifreq*) data; if (ifr->ifr_mtu > PPPOE_MAXMTU) return EINVAL; return sppp_ioctl(ifp, cmd, data); } default: return sppp_ioctl(ifp, cmd, data); } return 0; } /* * Allocate a mbuf/cluster with space to store the given data length * of payload, leaving space for prepending an ethernet header * in front. */ static struct mbuf * pppoe_get_mbuf(size_t len) { struct mbuf *m; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) return NULL; if (len+sizeof(struct ether_header) > MHLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { struct mbuf *n; MFREE(m, n); return 0; } } m->m_data += sizeof(struct ether_header); m->m_len = len; m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; return m; } static int pppoe_send_padi(struct pppoe_softc *sc) { struct mbuf *m0; int len, l1, l2; u_int8_t *p; if (sc->sc_state >PPPOE_STATE_PADI_SENT) panic("pppoe_send_padi in state %d", sc->sc_state); /* calculate length of frame (excluding ethernet header + pppoe header) */ len = 2+2+2+2+sizeof sc; /* service name tag is required, host unique is send too */ if (sc->sc_service_name != NULL) { l1 = strlen(sc->sc_service_name); len += l1; } if (sc->sc_concentrator_name != NULL) { l2 = strlen(sc->sc_concentrator_name); len += 2+2+l2; } /* allocate a buffer */ m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN); /* header len + payload len */ if (!m0) return ENOBUFS; /* fill in pkt */ p = mtod(m0, u_int8_t*); PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, len); PPPOE_ADD_16(p, PPPOE_TAG_SNAME); if (sc->sc_service_name != NULL) { PPPOE_ADD_16(p, l1); memcpy(p, sc->sc_service_name, l1); p += l1; } else { PPPOE_ADD_16(p, 0); } if (sc->sc_concentrator_name != NULL) { PPPOE_ADD_16(p, PPPOE_TAG_ACNAME); PPPOE_ADD_16(p, l2); memcpy(p, sc->sc_concentrator_name, l2); p += l2; } PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); PPPOE_ADD_16(p, sizeof(sc)); memcpy(p, &sc, sizeof sc); #ifdef PPPOE_DEBUG p += sizeof sc; if (p - mtod(m0, u_int8_t*) != len + PPPOE_HEADERLEN) panic("pppoe_send_padi: garbled output len, should be %ld, is %ld", (long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t*))); #endif /* send pkt */ return pppoe_output(sc, m0); } static void pppoe_timeout(void *arg) { int x, retry_wait; struct pppoe_softc *sc = (struct pppoe_softc*)arg; #ifdef PPPOE_DEBUG printf("%s: timeout\n", sc->sc_sppp.pp_if.if_xname); #endif switch (sc->sc_state) { case PPPOE_STATE_PADI_SENT: /* * We have two basic ways of retrying: * - Quick retry mode: try a few times in short sequence * - Slow retry mode: we already had a connection successfully * established and will try infinitely (without user * intervention) * We only enter slow retry mode if IFF_LINK1 (aka autodial) * is not set and we already had a successfull connection. */ /* initialize for quick retry mode */ retry_wait = PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried); x = splnet(); sc->sc_padi_retried++; if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) { if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0 && sc->sc_sppp.pp_if.if_ibytes) { /* slow retry mode */ retry_wait = PPPOE_SLOW_RETRY; } else { pppoe_abort_connect(sc); splx(x); return; } } if (pppoe_send_padi(sc) == 0) callout_reset(&sc->sc_timeout, retry_wait, pppoe_timeout, sc); else pppoe_abort_connect(sc); splx(x); break; case PPPOE_STATE_PADR_SENT: x = splnet(); sc->sc_padr_retried++; if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) { memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); sc->sc_state = PPPOE_STATE_PADI_SENT; sc->sc_padr_retried = 0; if (pppoe_send_padi(sc) == 0) callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried), pppoe_timeout, sc); else pppoe_abort_connect(sc); splx(x); return; } if (pppoe_send_padr(sc) == 0) callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc); else pppoe_abort_connect(sc); splx(x); break; case PPPOE_STATE_CLOSING: pppoe_disconnect(sc); break; default: return; /* all done, work in peace */ } } /* Start a connection (i.e. initiate discovery phase) */ static int pppoe_connect(struct pppoe_softc *sc) { int x, err; if (sc->sc_state != PPPOE_STATE_INITIAL) return EBUSY; x = splnet(); sc->sc_state = PPPOE_STATE_PADI_SENT; sc->sc_padr_retried = 0; err = pppoe_send_padi(sc); if (err == 0) callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT, pppoe_timeout, sc); else pppoe_abort_connect(sc); splx(x); return err; } /* disconnect */ static int pppoe_disconnect(struct pppoe_softc *sc) { int err, x; x = splnet(); if (sc->sc_state < PPPOE_STATE_SESSION) err = EBUSY; else { if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG) printf("%s: disconnecting\n", sc->sc_sppp.pp_if.if_xname); err = pppoe_send_padt(sc); } /* cleanup softc */ sc->sc_state = PPPOE_STATE_INITIAL; memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); if (sc->sc_ac_cookie) { free(sc->sc_ac_cookie, M_MBUF); sc->sc_ac_cookie = NULL; } sc->sc_ac_cookie_len = 0; sc->sc_session = 0; /* notify upper layer */ sc->sc_sppp.pp_down(&sc->sc_sppp); splx(x); return err; } /* Connection attempt aborted */ static void pppoe_abort_connect(struct pppoe_softc *sc) { printf("%s: could not establish connection\n", sc->sc_sppp.pp_if.if_xname); sc->sc_state = PPPOE_STATE_INITIAL; memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest)); /* notify upper layer */ sc->sc_sppp.pp_down(&sc->sc_sppp); } /* Send a PADR packet */ static int pppoe_send_padr(struct pppoe_softc *sc) { struct mbuf *m0; u_int8_t *p; size_t len, l1; if (sc->sc_state != PPPOE_STATE_PADR_SENT) return EIO; len = 2+2+2+2+sizeof(sc); /* service name, host unique */ if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ l1 = strlen(sc->sc_service_name); len += l1; } if (sc->sc_ac_cookie_len > 0) len += 2+2+sc->sc_ac_cookie_len; /* AC cookie */ m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN); if (!m0) return ENOBUFS; p = mtod(m0, u_int8_t*); PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len); PPPOE_ADD_16(p, PPPOE_TAG_SNAME); if (sc->sc_service_name != NULL) { PPPOE_ADD_16(p, l1); memcpy(p, sc->sc_service_name, l1); p += l1; } else { PPPOE_ADD_16(p, 0); } if (sc->sc_ac_cookie_len > 0) { PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); PPPOE_ADD_16(p, sc->sc_ac_cookie_len); memcpy(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len); p += sc->sc_ac_cookie_len; } PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); PPPOE_ADD_16(p, sizeof(sc)); memcpy(p, &sc, sizeof sc); #ifdef PPPOE_DEBUG p += sizeof sc; if (p - mtod(m0, u_int8_t*) != len + PPPOE_HEADERLEN) panic("pppoe_send_padr: garbled output len, should be %ld, is %ld", (long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t*))); #endif return pppoe_output(sc, m0); } /* send a PADT packet */ static int pppoe_send_padt(struct pppoe_softc *sc) { struct mbuf *m0; u_int8_t *p; if (sc->sc_state < PPPOE_STATE_SESSION) return EIO; #ifdef PPPOE_DEBUG printf("%s: sending PADT\n", sc->sc_sppp.pp_if.if_xname); #endif m0 = pppoe_get_mbuf(PPPOE_HEADERLEN); if (!m0) return ENOBUFS; p = mtod(m0, u_int8_t*); PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, sc->sc_session, 0); return pppoe_output(sc, m0); } static void pppoe_tls(struct sppp *sp) { struct pppoe_softc *sc = (void*)sp; if (sc->sc_state != PPPOE_STATE_INITIAL) return; pppoe_connect(sc); } static void pppoe_tlf(struct sppp *sp) { struct pppoe_softc *sc = (void*)sp; if (sc->sc_state < PPPOE_STATE_SESSION) return; /* * Do not call pppoe_disconnect here, the upper layer state * machine gets confused by this. We must return from this * function and defer disconnecting to the timeout handler. */ sc->sc_state = PPPOE_STATE_CLOSING; callout_reset(&sc->sc_timeout, hz/50, pppoe_timeout, sc); } static void pppoe_start(struct ifnet *ifp) { struct pppoe_softc *sc = (void*)ifp; struct mbuf *m; u_int8_t *p; size_t len; if (sppp_isempty(ifp)) return; /* are we ready to proccess data yet? */ if (sc->sc_state < PPPOE_STATE_SESSION) { sppp_flush(&sc->sc_sppp.pp_if); return; } while ((m = sppp_dequeue(ifp)) != NULL) { len = m->m_pkthdr.len; M_PREPEND(m, PPPOE_HEADERLEN, M_DONTWAIT); if (m == NULL) { m_free(m); break; } p = mtod(m, u_int8_t*); PPPOE_ADD_HEADER(p, 0, sc->sc_session, len); #if NBPFILTER > 0 if(sc->sc_sppp.pp_if.if_bpf) bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m); #endif pppoe_output(sc, m); } }