/* $FreeBSD$ */ /* * Copyright (C) 1998-2003 by Darren Reed & Guido van Rooij. * * See the IPFILTER.LICENCE file for details on licencing. */ #if defined(KERNEL) || defined(_KERNEL) # undef KERNEL # undef _KERNEL # define KERNEL 1 # define _KERNEL 1 #endif #include #include #include #include #include #if !defined(_KERNEL) # include # include # include # define _KERNEL # ifdef __OpenBSD__ struct file; # endif # include # undef _KERNEL #endif #if defined(_KERNEL) && (__FreeBSD_version >= 220000) # include # include #else # include #endif #if !defined(linux) # include #endif #include #if defined(_KERNEL) # include # if !defined(__SVR4) && !defined(__svr4__) && !defined(linux) # include # endif #endif #if defined(__SVR4) || defined(__svr4__) # include # include # ifdef _KERNEL # include # endif # include # include #endif #if (defined(_BSDI_VERSION) && _BSDI_VERSION >= 199802) || \ (defined(__FreeBSD_version) &&(__FreeBSD_version >= 400000)) # include #endif #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi) # include #endif #if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) # include #endif #include #ifdef sun # include #endif #include #include #include #include #if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi) # define KERNEL # define _KERNEL # define NOT_KERNEL #endif #if !defined(linux) # include #endif #ifdef NOT_KERNEL # undef _KERNEL # undef KERNEL #endif #include #if defined(IRIX) && (IRIX < 60516) /* IRIX < 6 */ extern struct ifqueue ipintrq; /* ip packet input queue */ #else # if !defined(__hpux) && !defined(linux) # if __FreeBSD_version >= 300000 # include # if __FreeBSD_version >= 500042 # define IF_QFULL _IF_QFULL # define IF_DROP _IF_DROP # endif /* __FreeBSD_version >= 500042 */ # endif # include # include # endif #endif #include #include #include "netinet/ip_compat.h" #include #include "netinet/ip_fil.h" #include "netinet/ip_auth.h" #if !defined(MENTAT) && !defined(linux) # include # ifdef __FreeBSD__ # include # endif #endif #if (__FreeBSD_version >= 300000) # include # if defined(_KERNEL) && !defined(IPFILTER_LKM) # include # include # endif #endif /* END OF INCLUDES */ #if !defined(lint) static const char rcsid[] = "@(#)$FreeBSD$"; /* static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.73.2.24 2007/09/09 11:32:04 darrenr Exp $"; */ #endif #if SOLARIS && defined(_KERNEL) extern kcondvar_t ipfauthwait; extern struct pollhead iplpollhead[IPL_LOGSIZE]; #endif /* SOLARIS */ #if defined(linux) && defined(_KERNEL) wait_queue_head_t fr_authnext_linux; #endif int fr_authsize = FR_NUMAUTH; int fr_authused = 0; int fr_defaultauthage = 600; int fr_auth_lock = 0; int fr_auth_init = 0; fr_authstat_t fr_authstats; static frauth_t *fr_auth = NULL; mb_t **fr_authpkts = NULL; int fr_authstart = 0, fr_authend = 0, fr_authnext = 0; frauthent_t *fae_list = NULL; frentry_t *ipauth = NULL, *fr_authlist = NULL; void fr_authderef __P((frauthent_t **)); int fr_authgeniter __P((ipftoken_t *, ipfgeniter_t *)); int fr_authreply __P((char *)); int fr_authwait __P((char *)); /* ------------------------------------------------------------------------ */ /* Function: fr_authinit */ /* Returns: int - 0 == success, else error */ /* Parameters: None */ /* */ /* Allocate memory and initialise data structures used in handling auth */ /* rules. */ /* ------------------------------------------------------------------------ */ int fr_authinit() { KMALLOCS(fr_auth, frauth_t *, fr_authsize * sizeof(*fr_auth)); if (fr_auth != NULL) bzero((char *)fr_auth, fr_authsize * sizeof(*fr_auth)); else return -1; KMALLOCS(fr_authpkts, mb_t **, fr_authsize * sizeof(*fr_authpkts)); if (fr_authpkts != NULL) bzero((char *)fr_authpkts, fr_authsize * sizeof(*fr_authpkts)); else return -2; MUTEX_INIT(&ipf_authmx, "ipf auth log mutex"); RWLOCK_INIT(&ipf_auth, "ipf IP User-Auth rwlock"); #if SOLARIS && defined(_KERNEL) cv_init(&ipfauthwait, "ipf auth condvar", CV_DRIVER, NULL); #endif #if defined(linux) && defined(_KERNEL) init_waitqueue_head(&fr_authnext_linux); #endif fr_auth_init = 1; return 0; } /* ------------------------------------------------------------------------ */ /* Function: fr_checkauth */ /* Returns: frentry_t* - pointer to ipf rule if match found, else NULL */ /* Parameters: fin(I) - pointer to ipftoken structure */ /* passp(I) - pointer to ipfgeniter structure */ /* */ /* Check if a packet has authorization. If the packet is found to match an */ /* authorization result and that would result in a feedback loop (i.e. it */ /* will end up returning FR_AUTH) then return FR_BLOCK instead. */ /* ------------------------------------------------------------------------ */ frentry_t *fr_checkauth(fin, passp) fr_info_t *fin; u_32_t *passp; { frentry_t *fr; frauth_t *fra; u_32_t pass; u_short id; ip_t *ip; int i; if (fr_auth_lock || !fr_authused) return NULL; ip = fin->fin_ip; id = ip->ip_id; READ_ENTER(&ipf_auth); for (i = fr_authstart; i != fr_authend; ) { /* * index becomes -2 only after an SIOCAUTHW. Check this in * case the same packet gets sent again and it hasn't yet been * auth'd. */ fra = fr_auth + i; if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) && !bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) { /* * Avoid feedback loop. */ if (!(pass = fra->fra_pass) || (FR_ISAUTH(pass))) pass = FR_BLOCK; /* * Create a dummy rule for the stateful checking to * use and return. Zero out any values we don't * trust from userland! */ if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) && (fin->fin_flx & FI_FRAG))) { KMALLOC(fr, frentry_t *); if (fr) { bcopy((char *)fra->fra_info.fin_fr, (char *)fr, sizeof(*fr)); fr->fr_grp = NULL; fr->fr_ifa = fin->fin_ifp; fr->fr_func = NULL; fr->fr_ref = 1; fr->fr_flags = pass; fr->fr_ifas[1] = NULL; fr->fr_ifas[2] = NULL; fr->fr_ifas[3] = NULL; } } else fr = fra->fra_info.fin_fr; fin->fin_fr = fr; RWLOCK_EXIT(&ipf_auth); WRITE_ENTER(&ipf_auth); /* * fr_authlist is populated with the rules malloc'd * above and only those. */ if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) { fr->fr_next = fr_authlist; fr_authlist = fr; } fr_authstats.fas_hits++; fra->fra_index = -1; fr_authused--; if (i == fr_authstart) { while (fra->fra_index == -1) { i++; fra++; if (i == fr_authsize) { i = 0; fra = fr_auth; } fr_authstart = i; if (i == fr_authend) break; } if (fr_authstart == fr_authend) { fr_authnext = 0; fr_authstart = fr_authend = 0; } } RWLOCK_EXIT(&ipf_auth); if (passp != NULL) *passp = pass; ATOMIC_INC64(fr_authstats.fas_hits); return fr; } i++; if (i == fr_authsize) i = 0; } fr_authstats.fas_miss++; RWLOCK_EXIT(&ipf_auth); ATOMIC_INC64(fr_authstats.fas_miss); return NULL; } /* ------------------------------------------------------------------------ */ /* Function: fr_newauth */ /* Returns: int - 1 == success, 0 = did not put packet on auth queue */ /* Parameters: m(I) - pointer to mb_t with packet in it */ /* fin(I) - pointer to packet information */ /* */ /* Check if we have room in the auth array to hold details for another */ /* packet. If we do, store it and wake up any user programs which are */ /* waiting to hear about these events. */ /* ------------------------------------------------------------------------ */ int fr_newauth(m, fin) mb_t *m; fr_info_t *fin; { #if defined(_KERNEL) && defined(MENTAT) qpktinfo_t *qpi = fin->fin_qpi; #endif frauth_t *fra; #if !defined(sparc) && !defined(m68k) ip_t *ip; #endif int i; if (fr_auth_lock) return 0; WRITE_ENTER(&ipf_auth); if (((fr_authend + 1) % fr_authsize) == fr_authstart) { fr_authstats.fas_nospace++; RWLOCK_EXIT(&ipf_auth); return 0; } fr_authstats.fas_added++; fr_authused++; i = fr_authend++; if (fr_authend == fr_authsize) fr_authend = 0; fra = fr_auth + i; fra->fra_index = i; RWLOCK_EXIT(&ipf_auth); if (fin->fin_fr != NULL) fra->fra_pass = fin->fin_fr->fr_flags; else fra->fra_pass = 0; fra->fra_age = fr_defaultauthage; bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin)); #if !defined(sparc) && !defined(m68k) /* * No need to copyback here as we want to undo the changes, not keep * them. */ ip = fin->fin_ip; # if defined(MENTAT) && defined(_KERNEL) if ((ip == (ip_t *)m->b_rptr) && (fin->fin_v == 4)) # endif { register u_short bo; bo = ip->ip_len; ip->ip_len = htons(bo); bo = ip->ip_off; ip->ip_off = htons(bo); } #endif #if SOLARIS && defined(_KERNEL) COPYIFNAME(fin->fin_v, fin->fin_ifp, fra->fra_info.fin_ifname); m->b_rptr -= qpi->qpi_off; fr_authpkts[i] = *(mblk_t **)fin->fin_mp; # if !defined(_INET_IP_STACK_H) fra->fra_q = qpi->qpi_q; /* The queue can disappear! */ # endif fra->fra_m = *fin->fin_mp; fra->fra_info.fin_mp = &fra->fra_m; cv_signal(&ipfauthwait); pollwakeup(&iplpollhead[IPL_LOGAUTH], POLLIN|POLLRDNORM); #else fr_authpkts[i] = m; WAKEUP(&fr_authnext,0); #endif return 1; } /* ------------------------------------------------------------------------ */ /* Function: fr_auth_ioctl */ /* Returns: int - 0 == success, else error */ /* Parameters: data(IO) - pointer to ioctl data */ /* cmd(I) - ioctl command */ /* mode(I) - mode flags associated with open descriptor */ /* uid(I) - uid associatd with application making the call */ /* ctx(I) - pointer for context */ /* */ /* This function handles all of the ioctls recognised by the auth component */ /* in IPFilter - ie ioctls called on an open fd for /dev/ipauth */ /* ------------------------------------------------------------------------ */ int fr_auth_ioctl(data, cmd, mode, uid, ctx) caddr_t data; ioctlcmd_t cmd; int mode, uid; void *ctx; { int error = 0, i; SPL_INT(s); switch (cmd) { case SIOCGENITER : { ipftoken_t *token; ipfgeniter_t iter; error = fr_inobj(data, &iter, IPFOBJ_GENITER); if (error != 0) break; SPL_SCHED(s); token = ipf_findtoken(IPFGENITER_AUTH, uid, ctx); if (token != NULL) error = fr_authgeniter(token, &iter); else error = ESRCH; RWLOCK_EXIT(&ipf_tokens); SPL_X(s); break; } case SIOCADAFR : case SIOCRMAFR : if (!(mode & FWRITE)) error = EPERM; else error = frrequest(IPL_LOGAUTH, cmd, data, fr_active, 1); break; case SIOCSTLCK : if (!(mode & FWRITE)) { error = EPERM; break; } error = fr_lock(data, &fr_auth_lock); break; case SIOCATHST: fr_authstats.fas_faelist = fae_list; error = fr_outobj(data, &fr_authstats, IPFOBJ_AUTHSTAT); break; case SIOCIPFFL: SPL_NET(s); WRITE_ENTER(&ipf_auth); i = fr_authflush(); RWLOCK_EXIT(&ipf_auth); SPL_X(s); error = BCOPYOUT((char *)&i, data, sizeof(i)); if (error != 0) error = EFAULT; break; case SIOCAUTHW: error = fr_authwait(data); break; case SIOCAUTHR: error = fr_authreply(data); break; default : error = EINVAL; break; } return error; } /* ------------------------------------------------------------------------ */ /* Function: fr_authunload */ /* Returns: None */ /* Parameters: None */ /* */ /* Free all network buffer memory used to keep saved packets. */ /* ------------------------------------------------------------------------ */ void fr_authunload() { register int i; register frauthent_t *fae, **faep; frentry_t *fr, **frp; mb_t *m; if (fr_auth != NULL) { KFREES(fr_auth, fr_authsize * sizeof(*fr_auth)); fr_auth = NULL; } if (fr_authpkts != NULL) { for (i = 0; i < fr_authsize; i++) { m = fr_authpkts[i]; if (m != NULL) { FREE_MB_T(m); fr_authpkts[i] = NULL; } } KFREES(fr_authpkts, fr_authsize * sizeof(*fr_authpkts)); fr_authpkts = NULL; } faep = &fae_list; while ((fae = *faep) != NULL) { *faep = fae->fae_next; KFREE(fae); } ipauth = NULL; if (fr_authlist != NULL) { for (frp = &fr_authlist; ((fr = *frp) != NULL); ) { if (fr->fr_ref == 1) { *frp = fr->fr_next; KFREE(fr); } else frp = &fr->fr_next; } } if (fr_auth_init == 1) { # if SOLARIS && defined(_KERNEL) cv_destroy(&ipfauthwait); # endif MUTEX_DESTROY(&ipf_authmx); RW_DESTROY(&ipf_auth); fr_auth_init = 0; } } /* ------------------------------------------------------------------------ */ /* Function: fr_authexpire */ /* Returns: None */ /* Parameters: None */ /* */ /* Slowly expire held auth records. Timeouts are set in expectation of */ /* this being called twice per second. */ /* ------------------------------------------------------------------------ */ void fr_authexpire() { frauthent_t *fae, **faep; frentry_t *fr, **frp; frauth_t *fra; mb_t *m; int i; SPL_INT(s); if (fr_auth_lock) return; SPL_NET(s); WRITE_ENTER(&ipf_auth); for (i = 0, fra = fr_auth; i < fr_authsize; i++, fra++) { fra->fra_age--; if ((fra->fra_age == 0) && (m = fr_authpkts[i])) { FREE_MB_T(m); fr_authpkts[i] = NULL; fr_auth[i].fra_index = -1; fr_authstats.fas_expire++; fr_authused--; } } /* * Expire pre-auth rules */ for (faep = &fae_list; ((fae = *faep) != NULL); ) { fae->fae_age--; if (fae->fae_age == 0) { fr_authderef(&fae); fr_authstats.fas_expire++; } else faep = &fae->fae_next; } if (fae_list != NULL) ipauth = &fae_list->fae_fr; else ipauth = NULL; for (frp = &fr_authlist; ((fr = *frp) != NULL); ) { if (fr->fr_ref == 1) { *frp = fr->fr_next; KFREE(fr); } else frp = &fr->fr_next; } RWLOCK_EXIT(&ipf_auth); SPL_X(s); } /* ------------------------------------------------------------------------ */ /* Function: fr_preauthcmd */ /* Returns: int - 0 == success, else error */ /* Parameters: cmd(I) - ioctl command for rule */ /* fr(I) - pointer to ipf rule */ /* fptr(I) - pointer to caller's 'fr' */ /* */ /* ------------------------------------------------------------------------ */ int fr_preauthcmd(cmd, fr, frptr) ioctlcmd_t cmd; frentry_t *fr, **frptr; { frauthent_t *fae, **faep; int error = 0; SPL_INT(s); if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) return EIO; for (faep = &fae_list; ((fae = *faep) != NULL); ) { if (&fae->fae_fr == fr) break; else faep = &fae->fae_next; } if (cmd == (ioctlcmd_t)SIOCRMAFR) { if (fr == NULL || frptr == NULL) error = EINVAL; else if (fae == NULL) error = ESRCH; else { SPL_NET(s); WRITE_ENTER(&ipf_auth); *faep = fae->fae_next; if (ipauth == &fae->fae_fr) ipauth = fae_list ? &fae_list->fae_fr : NULL; RWLOCK_EXIT(&ipf_auth); SPL_X(s); KFREE(fae); } } else if (fr != NULL && frptr != NULL) { KMALLOC(fae, frauthent_t *); if (fae != NULL) { bcopy((char *)fr, (char *)&fae->fae_fr, sizeof(*fr)); SPL_NET(s); WRITE_ENTER(&ipf_auth); fae->fae_age = fr_defaultauthage; fae->fae_fr.fr_hits = 0; fae->fae_fr.fr_next = *frptr; fae->fae_ref = 1; *frptr = &fae->fae_fr; fae->fae_next = *faep; *faep = fae; ipauth = &fae_list->fae_fr; RWLOCK_EXIT(&ipf_auth); SPL_X(s); } else error = ENOMEM; } else error = EINVAL; return error; } /* ------------------------------------------------------------------------ */ /* Function: fr_authflush */ /* Returns: int - number of auth entries flushed */ /* Parameters: None */ /* Locks: WRITE(ipf_auth) */ /* */ /* This function flushs the fr_authpkts array of any packet data with */ /* references still there. */ /* It is expected that the caller has already acquired the correct locks or */ /* set the priority level correctly for this to block out other code paths */ /* into these data structures. */ /* ------------------------------------------------------------------------ */ int fr_authflush() { register int i, num_flushed; mb_t *m; if (fr_auth_lock) return -1; num_flushed = 0; for (i = 0 ; i < fr_authsize; i++) { m = fr_authpkts[i]; if (m != NULL) { FREE_MB_T(m); fr_authpkts[i] = NULL; fr_auth[i].fra_index = -1; /* perhaps add & use a flush counter inst.*/ fr_authstats.fas_expire++; fr_authused--; num_flushed++; } } fr_authstart = 0; fr_authend = 0; fr_authnext = 0; return num_flushed; } /* ------------------------------------------------------------------------ */ /* Function: fr_auth_waiting */ /* Returns: int - 0 = no pakcets wiating, 1 = packets waiting. */ /* Parameters: None */ /* */ /* Simple truth check to see if there are any packets waiting in the auth */ /* queue. */ /* ------------------------------------------------------------------------ */ int fr_auth_waiting() { return (fr_authused != 0); } /* ------------------------------------------------------------------------ */ /* Function: fr_authgeniter */ /* Returns: int - 0 == success, else error */ /* Parameters: token(I) - pointer to ipftoken structure */ /* itp(I) - pointer to ipfgeniter structure */ /* */ /* ------------------------------------------------------------------------ */ int fr_authgeniter(token, itp) ipftoken_t *token; ipfgeniter_t *itp; { frauthent_t *fae, *next, zero; int error; if (itp->igi_data == NULL) return EFAULT; if (itp->igi_type != IPFGENITER_AUTH) return EINVAL; fae = token->ipt_data; READ_ENTER(&ipf_auth); if (fae == NULL) { next = fae_list; } else { next = fae->fae_next; } if (next != NULL) { /* * If we find an auth entry to use, bump its reference count * so that it can be used for is_next when we come back. */ ATOMIC_INC(next->fae_ref); if (next->fae_next == NULL) { ipf_freetoken(token); token = NULL; } else { token->ipt_data = next; } } else { bzero(&zero, sizeof(zero)); next = &zero; } RWLOCK_EXIT(&ipf_auth); /* * If we had a prior pointer to an auth entry, release it. */ if (fae != NULL) { WRITE_ENTER(&ipf_auth); fr_authderef(&fae); RWLOCK_EXIT(&ipf_auth); } /* * This should arguably be via fr_outobj() so that the auth * structure can (if required) be massaged going out. */ error = COPYOUT(next, itp->igi_data, sizeof(*next)); if (error != 0) error = EFAULT; return error; } /* ------------------------------------------------------------------------ */ /* Function: fr_authderef */ /* Returns: None */ /* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */ /* Locks: WRITE(ipf_auth) */ /* */ /* This function unconditionally sets the pointer in the caller to NULL, */ /* to make it clear that it should no longer use that pointer, and drops */ /* the reference count on the structure by 1. If it reaches 0, free it up. */ /* ------------------------------------------------------------------------ */ void fr_authderef(faep) frauthent_t **faep; { frauthent_t *fae; fae = *faep; *faep = NULL; fae->fae_ref--; if (fae->fae_ref == 0) { KFREE(fae); } } /* ------------------------------------------------------------------------ */ /* Function: fr_authwait */ /* Returns: int - 0 == success, else error */ /* Parameters: data(I) - pointer to data from ioctl call */ /* */ /* This function is called when an application is waiting for a packet to */ /* match an "auth" rule by issuing an SIOCAUTHW ioctl. If there is already */ /* a packet waiting on the queue then we will return that _one_ immediately.*/ /* If there are no packets present in the queue (fr_authpkts) then we go to */ /* sleep. */ /* ------------------------------------------------------------------------ */ int fr_authwait(data) char *data; { frauth_t auth, *au = &auth; int error, len, i; mb_t *m; char *t; #if defined(_KERNEL) && !defined(MENTAT) && !defined(linux) && \ (!defined(__FreeBSD_version) || (__FreeBSD_version < 501000)) SPL_INT(s); #endif fr_authioctlloop: error = fr_inobj(data, au, IPFOBJ_FRAUTH); if (error != 0) return error; /* * XXX Locks are held below over calls to copyout...a better * solution needs to be found so this isn't necessary. The situation * we are trying to guard against here is an error in the copyout * steps should not cause the packet to "disappear" from the queue. */ READ_ENTER(&ipf_auth); /* * If fr_authnext is not equal to fr_authend it will be because there * is a packet waiting to be delt with in the fr_authpkts array. We * copy as much of that out to user space as requested. */ if (fr_authused > 0) { while (fr_authpkts[fr_authnext] == NULL) { fr_authnext++; if (fr_authnext == fr_authsize) fr_authnext = 0; } error = fr_outobj(data, &fr_auth[fr_authnext], IPFOBJ_FRAUTH); if (error != 0) return error; if (auth.fra_len != 0 && auth.fra_buf != NULL) { /* * Copy packet contents out to user space if * requested. Bail on an error. */ m = fr_authpkts[fr_authnext]; len = MSGDSIZE(m); if (len > auth.fra_len) len = auth.fra_len; auth.fra_len = len; for (t = auth.fra_buf; m && (len > 0); ) { i = MIN(M_LEN(m), len); error = copyoutptr(MTOD(m, char *), &t, i); len -= i; t += i; if (error != 0) return error; m = m->m_next; } } RWLOCK_EXIT(&ipf_auth); SPL_NET(s); WRITE_ENTER(&ipf_auth); fr_authnext++; if (fr_authnext == fr_authsize) fr_authnext = 0; RWLOCK_EXIT(&ipf_auth); SPL_X(s); return 0; } RWLOCK_EXIT(&ipf_auth); MUTEX_ENTER(&ipf_authmx); #ifdef _KERNEL # if SOLARIS error = 0; if (!cv_wait_sig(&ipfauthwait, &ipf_authmx.ipf_lk)) error = EINTR; # else /* SOLARIS */ # ifdef __hpux { lock_t *l; l = get_sleep_lock(&fr_authnext); error = sleep(&fr_authnext, PZERO+1); spinunlock(l); } # else # ifdef __osf__ error = mpsleep(&fr_authnext, PSUSP|PCATCH, "fr_authnext", 0, &ipf_authmx, MS_LOCK_SIMPLE); # else error = SLEEP(&fr_authnext, "fr_authnext"); # endif /* __osf__ */ # endif /* __hpux */ # endif /* SOLARIS */ #endif MUTEX_EXIT(&ipf_authmx); if (error == 0) goto fr_authioctlloop; return error; } /* ------------------------------------------------------------------------ */ /* Function: fr_authreply */ /* Returns: int - 0 == success, else error */ /* Parameters: data(I) - pointer to data from ioctl call */ /* */ /* This function is called by an application when it wants to return a */ /* decision on a packet using the SIOCAUTHR ioctl. This is after it has */ /* received information using an SIOCAUTHW. The decision returned in the */ /* form of flags, the same as those used in each rule. */ /* ------------------------------------------------------------------------ */ int fr_authreply(data) char *data; { frauth_t auth, *au = &auth, *fra; int error, i; mb_t *m; SPL_INT(s); error = fr_inobj(data, &auth, IPFOBJ_FRAUTH); if (error != 0) return error; SPL_NET(s); WRITE_ENTER(&ipf_auth); i = au->fra_index; fra = fr_auth + i; error = 0; /* * Check the validity of the information being returned with two simple * checks. First, the auth index value should be within the size of * the array and second the packet id being returned should also match. */ if ((i < 0) || (i >= fr_authsize) || (fra->fra_info.fin_id != au->fra_info.fin_id)) { RWLOCK_EXIT(&ipf_auth); SPL_X(s); return ESRCH; } m = fr_authpkts[i]; fra->fra_index = -2; fra->fra_pass = au->fra_pass; fr_authpkts[i] = NULL; RWLOCK_EXIT(&ipf_auth); /* * Re-insert the packet back into the packet stream flowing through * the kernel in a manner that will mean IPFilter sees the packet * again. This is not the same as is done with fastroute, * deliberately, as we want to resume the normal packet processing * path for it. */ #ifdef _KERNEL if ((m != NULL) && (au->fra_info.fin_out != 0)) { error = ipf_inject(&fra->fra_info, m); if (error != 0) { error = ENOBUFS; fr_authstats.fas_sendfail++; } else { fr_authstats.fas_sendok++; } } else if (m) { error = ipf_inject(&fra->fra_info, m); if (error != 0) { error = ENOBUFS; fr_authstats.fas_quefail++; } else { fr_authstats.fas_queok++; } } else { error = EINVAL; } /* * If we experience an error which will result in the packet * not being processed, make sure we advance to the next one. */ if (error == ENOBUFS) { WRITE_ENTER(&ipf_auth); fr_authused--; fra->fra_index = -1; fra->fra_pass = 0; if (i == fr_authstart) { while (fra->fra_index == -1) { i++; if (i == fr_authsize) i = 0; fr_authstart = i; if (i == fr_authend) break; } if (fr_authstart == fr_authend) { fr_authnext = 0; fr_authstart = fr_authend = 0; } } RWLOCK_EXIT(&ipf_auth); } #endif /* _KERNEL */ SPL_X(s); return 0; }