/* * Copyright (C) 1998 by Darren Reed & Guido van Rooij. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and due credit is given * to the original author and the contributors. */ #if !defined(lint) /*static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.1.2.2 2000/01/16 10:12:14 darrenr Exp $";*/ static const char rcsid[] = "@(#)$FreeBSD$"; #endif #include #include #include #include #include #if !defined(_KERNEL) && !defined(KERNEL) # include # include # include #endif #if defined(_KERNEL) && (__FreeBSD_version >= 220000) # include # include #else # include #endif #include #ifndef linux # include #endif #include #if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux) # include #endif #if !defined(__SVR4) && !defined(__svr4__) # ifndef linux # include # endif #else # include # include # ifdef _KERNEL # include # endif # include # include #endif #if _BSDI_VERSION >= 199802 # include #endif #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi) # include #endif #include #ifdef sun # include #endif #include #include #include #include #ifndef KERNEL # define KERNEL # define NOT_KERNEL #endif #ifndef linux # include #endif #ifdef NOT_KERNEL # undef KERNEL #endif #ifdef __sgi # ifdef IFF_DRVRLOCK /* IRIX6 */ # include # endif #endif #include #if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */ extern struct ifqueue ipintrq; /* ip packet input queue */ #else # ifndef linux # if __FreeBSD_version >= 300000 # include # endif # include # include # endif #endif #include #include #include "netinet/ip_compat.h" #include #include "netinet/ip_fil.h" #include "netinet/ip_auth.h" #if !SOLARIS && !defined(linux) # include # ifdef __FreeBSD__ # include # endif #endif #if (__FreeBSD_version >= 300000) # include # if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM) # include # include # endif #endif #if (SOLARIS || defined(__sgi)) && defined(_KERNEL) extern KRWLOCK_T ipf_auth; extern kmutex_t ipf_authmx; # if SOLARIS extern kcondvar_t ipfauthwait; # endif #endif #ifdef linux static struct wait_queue *ipfauthwait = NULL; #endif int fr_authsize = FR_NUMAUTH; int fr_authused = 0; int fr_defaultauthage = 600; fr_authstat_t fr_authstats; frauth_t fr_auth[FR_NUMAUTH]; mb_t *fr_authpkts[FR_NUMAUTH]; int fr_authstart = 0, fr_authend = 0, fr_authnext = 0; frauthent_t *fae_list = NULL; frentry_t *ipauth = NULL; /* * 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. */ u_32_t fr_checkauth(ip, fin) ip_t *ip; fr_info_t *fin; { u_short id = ip->ip_id; u_32_t pass; int i; 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. */ if ((fr_auth[i].fra_index == -2) && (id == fr_auth[i].fra_info.fin_id) && !bcmp((char *)fin,(char *)&fr_auth[i].fra_info,FI_CSIZE)) { /* * Avoid feedback loop. */ if (!(pass = fr_auth[i].fra_pass) || (pass & FR_AUTH)) pass = FR_BLOCK; RWLOCK_EXIT(&ipf_auth); WRITE_ENTER(&ipf_auth); fr_authstats.fas_hits++; fr_auth[i].fra_index = -1; fr_authused--; if (i == fr_authstart) { while (fr_auth[i].fra_index == -1) { i++; if (i == FR_NUMAUTH) 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); return pass; } i++; if (i == FR_NUMAUTH) i = 0; } fr_authstats.fas_miss++; RWLOCK_EXIT(&ipf_auth); return 0; } /* * 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, ip #if defined(_KERNEL) && SOLARIS , qif) qif_t *qif; #else ) #endif mb_t *m; fr_info_t *fin; ip_t *ip; { int i; WRITE_ENTER(&ipf_auth); if (fr_authstart > fr_authend) { fr_authstats.fas_nospace++; RWLOCK_EXIT(&ipf_auth); return 0; } else { if ((fr_authstart == 0) && (fr_authend == FR_NUMAUTH - 1)) { fr_authstats.fas_nospace++; RWLOCK_EXIT(&ipf_auth); return 0; } } fr_authstats.fas_added++; fr_authused++; i = fr_authend++; if (fr_authend == FR_NUMAUTH) fr_authend = 0; RWLOCK_EXIT(&ipf_auth); fr_auth[i].fra_index = i; fr_auth[i].fra_pass = 0; fr_auth[i].fra_age = fr_defaultauthage; bcopy((char *)fin, (char *)&fr_auth[i].fra_info, sizeof(*fin)); #if !defined(sparc) && !defined(m68k) /* * No need to copyback here as we want to undo the changes, not keep * them. */ # if SOLARIS && defined(_KERNEL) if (ip == (ip_t *)m->b_rptr) # endif { register u_short bo; bo = ip->ip_len; ip->ip_len = htons(bo); # if !SOLARIS /* 4.4BSD converts this ip_input.c, but I don't in solaris.c */ bo = ip->ip_id; ip->ip_id = htons(bo); # endif bo = ip->ip_off; ip->ip_off = htons(bo); } #endif #if SOLARIS && defined(_KERNEL) m->b_rptr -= qif->qf_off; fr_authpkts[i] = *(mblk_t **)fin->fin_mp; fr_auth[i].fra_q = qif->qf_q; cv_signal(&ipfauthwait); #else fr_authpkts[i] = m; # if defined(linux) && defined(_KERNEL) wake_up_interruptible(&ipfauthwait); # else WAKEUP(&fr_authnext); # endif #endif return 1; } int fr_auth_ioctl(data, cmd, fr, frptr) caddr_t data; #if defined(__NetBSD__) || defined(__OpenBSD__) u_long cmd; #else int cmd; #endif frentry_t *fr, **frptr; { mb_t *m; #if defined(_KERNEL) # if !SOLARIS struct ifqueue *ifq; int s; # endif #endif frauth_t auth, *au = &auth; frauthent_t *fae, **faep; int i, error = 0; switch (cmd) { case SIOCINIFR : case SIOCRMIFR : case SIOCADIFR : error = EINVAL; break; case SIOCINAFR : case SIOCRMAFR : case SIOCADAFR : for (faep = &fae_list; (fae = *faep); ) if (&fae->fae_fr == fr) break; else faep = &fae->fae_next; if (cmd == SIOCRMAFR) { if (!fae) error = ESRCH; else { WRITE_ENTER(&ipf_auth); *faep = fae->fae_next; *frptr = fr->fr_next; RWLOCK_EXIT(&ipf_auth); KFREE(fae); } } else { KMALLOC(fae, frauthent_t *); if (fae != NULL) { IRCOPY((char *)data, (char *)&fae->fae_fr, sizeof(fae->fae_fr)); WRITE_ENTER(&ipf_auth); fae->fae_age = fr_defaultauthage; fae->fae_fr.fr_hits = 0; fae->fae_fr.fr_next = *frptr; *frptr = &fae->fae_fr; fae->fae_next = *faep; *faep = fae; ipauth = &fae_list->fae_fr; RWLOCK_EXIT(&ipf_auth); } else error = ENOMEM; } break; case SIOCATHST: READ_ENTER(&ipf_auth); fr_authstats.fas_faelist = fae_list; RWLOCK_EXIT(&ipf_auth); IWCOPY((char *)&fr_authstats, data, sizeof(fr_authstats)); break; case SIOCAUTHW: fr_authioctlloop: READ_ENTER(&ipf_auth); if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) { IWCOPY((char *)&fr_auth[fr_authnext], data, sizeof(fr_info_t)); RWLOCK_EXIT(&ipf_auth); WRITE_ENTER(&ipf_auth); fr_authnext++; if (fr_authnext == FR_NUMAUTH) fr_authnext = 0; RWLOCK_EXIT(&ipf_auth); return 0; } #ifdef _KERNEL # if SOLARIS mutex_enter(&ipf_authmx); if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) { mutex_exit(&ipf_authmx); return EINTR; } mutex_exit(&ipf_authmx); # else # ifdef linux interruptible_sleep_on(&ipfauthwait); if (current->signal & ~current->blocked) error = -EINTR; # else error = SLEEP(&fr_authnext, "fr_authnext"); # endif # endif #endif RWLOCK_EXIT(&ipf_auth); if (!error) goto fr_authioctlloop; break; case SIOCAUTHR: IRCOPY(data, (caddr_t)&auth, sizeof(auth)); WRITE_ENTER(&ipf_auth); i = au->fra_index; if ((i < 0) || (i > FR_NUMAUTH) || (fr_auth[i].fra_info.fin_id != au->fra_info.fin_id)) { RWLOCK_EXIT(&ipf_auth); return EINVAL; } m = fr_authpkts[i]; fr_auth[i].fra_index = -2; fr_auth[i].fra_pass = au->fra_pass; fr_authpkts[i] = NULL; #ifdef _KERNEL RWLOCK_EXIT(&ipf_auth); SPL_NET(s); # ifndef linux if (m && au->fra_info.fin_out) { # if SOLARIS error = fr_qout(fr_auth[i].fra_q, m); # else /* SOLARIS */ # if (_BSDI_VERSION >= 199802) || defined(__OpenBSD__) error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); # else error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); # endif # endif /* SOLARIS */ if (error) fr_authstats.fas_sendfail++; else fr_authstats.fas_sendok++; } else if (m) { # if SOLARIS error = fr_qin(fr_auth[i].fra_q, m); # else /* SOLARIS */ ifq = &ipintrq; if (IF_QFULL(ifq)) { IF_DROP(ifq); m_freem(m); error = ENOBUFS; } else { IF_ENQUEUE(ifq, m); schednetisr(NETISR_IP); } # endif /* SOLARIS */ if (error) fr_authstats.fas_quefail++; else fr_authstats.fas_queok++; } else error = EINVAL; # endif # if SOLARIS if (error) error = EINVAL; # else /* * 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) { fr_authused--; fr_auth[i].fra_index = -1; fr_auth[i].fra_pass = 0; if (i == fr_authstart) { while (fr_auth[i].fra_index == -1) { i++; if (i == FR_NUMAUTH) i = 0; fr_authstart = i; if (i == fr_authend) break; } if (fr_authstart == fr_authend) { fr_authnext = 0; fr_authstart = fr_authend = 0; } } } # endif SPL_X(s); #endif /* _KERNEL */ break; default : error = EINVAL; break; } return error; } #ifdef _KERNEL /* * Free all network buffer memory used to keep saved packets. */ void fr_authunload() { register int i; register frauthent_t *fae, **faep; mb_t *m; WRITE_ENTER(&ipf_auth); for (i = 0; i < FR_NUMAUTH; i++) { if ((m = fr_authpkts[i])) { FREE_MB_T(m); fr_authpkts[i] = NULL; fr_auth[i].fra_index = -1; } } for (faep = &fae_list; (fae = *faep); ) { *faep = fae->fae_next; KFREE(fae); } ipauth = NULL; RWLOCK_EXIT(&ipf_auth); } /* * Slowly expire held auth records. Timeouts are set * in expectation of this being called twice per second. */ void fr_authexpire() { register int i; register frauth_t *fra; register frauthent_t *fae, **faep; mb_t *m; #if !SOLARIS int s; #endif SPL_NET(s); WRITE_ENTER(&ipf_auth); for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) { if ((!--fra->fra_age) && (m = fr_authpkts[i])) { FREE_MB_T(m); fr_authpkts[i] = NULL; fr_auth[i].fra_index = -1; fr_authstats.fas_expire++; fr_authused--; } } for (faep = &fae_list; (fae = *faep); ) { if (!--fae->fae_age) { *faep = fae->fae_next; KFREE(fae); fr_authstats.fas_expire++; } else faep = &fae->fae_next; } ipauth = &fae_list->fae_fr; RWLOCK_EXIT(&ipf_auth); SPL_X(s); } #endif