/* $NetBSD: ip_log.c,v 1.3 2005/03/26 18:08:42 christos Exp $ */ /* * Copyright (C) 1997-2003 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Id: ip_log.c,v 2.75.2.6 2004/10/16 07:59:27 darrenr Exp */ #include __KERNEL_RCSID(0, "$NetBSD: ip_log.c,v 1.3 2005/03/26 18:08:42 christos Exp $"); #include #if defined(KERNEL) || defined(_KERNEL) # undef KERNEL # undef _KERNEL # define KERNEL 1 # define _KERNEL 1 #endif #if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \ defined(_KERNEL) # include "opt_ipfilter.h" #endif #if defined(__FreeBSD__) && !defined(IPFILTER_LKM) # if defined(_KERNEL) # if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) # include "opt_ipfilter.h" # endif # else # include # endif #endif #ifndef SOLARIS # define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) #endif #include #include #include #ifndef _KERNEL # include # include # include # include # define _KERNEL # define KERNEL # ifdef __OpenBSD__ struct file; # endif # include # undef _KERNEL # undef KERNEL #endif #if __FreeBSD_version >= 220000 && defined(_KERNEL) # include # include #else # include #endif #include #if defined(_KERNEL) # include # if defined(NetBSD) && (__NetBSD_Version__ >= 104000000) # include # endif #endif /* _KERNEL */ #if !SOLARIS && !defined(__hpux) && !defined(linux) # if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000) # include # else # include # endif # include #else # if !defined(__hpux) && defined(_KERNEL) # include # include # include # include # include # include # include # include # include # endif /* !__hpux */ #endif /* !SOLARIS && !__hpux */ #if !defined(linux) # include #endif #include #include #ifdef sun # include #endif #if __FreeBSD_version >= 300000 # include #endif #include #include #ifdef __sgi # include # ifdef IFF_DRVRLOCK /* IRIX6 */ # include # endif #endif #if !defined(__hpux) && !defined(linux) && \ !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/ # include #endif #include #include #include #include #include #ifdef USE_INET6 # include #endif #if !defined(linux) # include #endif #ifndef _KERNEL # include #endif #include "netinet/ip_compat.h" #include #include "netinet/ip_fil.h" #include "netinet/ip_nat.h" #include "netinet/ip_frag.h" #include "netinet/ip_state.h" #include "netinet/ip_auth.h" #if (__FreeBSD_version >= 300000) || defined(__NetBSD__) # include #endif /* END OF INCLUDES */ #ifdef IPFILTER_LOG # if defined(IPL_SELECT) # include # include # define READ_COLLISION 0x001 iplog_select_t iplog_ss[IPL_LOGMAX+1]; extern int selwait; # endif /* IPL_SELECT */ # if defined(linux) && defined(_KERNEL) wait_queue_head_t iplh_linux[IPL_LOGSIZE]; # endif # if SOLARIS extern kcondvar_t iplwait; # endif iplog_t **iplh[IPL_LOGSIZE], *iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE]; int iplused[IPL_LOGSIZE]; static fr_info_t iplcrc[IPL_LOGSIZE]; int ipl_suppress = 1; int ipl_buffer_sz; int ipl_logmax = IPL_LOGMAX; int ipl_logall = 0; int ipl_log_init = 0; int ipl_logsize = IPFILTER_LOGSIZE; int ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE, IPL_MAGIC, IPL_MAGIC, IPL_MAGIC, IPL_MAGIC, IPL_MAGIC }; /* ------------------------------------------------------------------------ */ /* Function: fr_loginit */ /* Returns: int - 0 == success (always returned) */ /* Parameters: Nil */ /* */ /* Initialise log buffers & pointers. Also iniialised the CRC to a local */ /* secret for use in calculating the "last log checksum". */ /* ------------------------------------------------------------------------ */ int fr_loginit() { int i; for (i = IPL_LOGMAX; i >= 0; i--) { iplt[i] = NULL; ipll[i] = NULL; iplh[i] = &iplt[i]; iplused[i] = 0; bzero((char *)&iplcrc[i], sizeof(iplcrc[i])); # ifdef IPL_SELECT iplog_ss[i].read_waiter = 0; iplog_ss[i].state = 0; # endif # if defined(linux) && defined(_KERNEL) init_waitqueue_head(iplh_linux + i); # endif } # if SOLARIS && defined(_KERNEL) cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL); # endif MUTEX_INIT(&ipl_mutex, "ipf log mutex"); ipl_log_init = 1; return 0; } /* ------------------------------------------------------------------------ */ /* Function: fr_logunload */ /* Returns: Nil */ /* Parameters: Nil */ /* */ /* Clean up any log data that has accumulated without being read. */ /* ------------------------------------------------------------------------ */ void fr_logunload() { int i; if (ipl_log_init == 0) return; for (i = IPL_LOGMAX; i >= 0; i--) (void) ipflog_clear(i); # if SOLARIS && defined(_KERNEL) cv_destroy(&iplwait); # endif MUTEX_DESTROY(&ipl_mutex); ipl_log_init = 0; } /* ------------------------------------------------------------------------ */ /* Function: ipflog */ /* Returns: int - 0 == success, -1 == failure */ /* Parameters: fin(I) - pointer to packet information */ /* flags(I) - flags from filter rules */ /* */ /* Create a log record for a packet given that it has been triggered by a */ /* rule (or the default setting). Calculate the transport protocol header */ /* size using predetermined size of a couple of popular protocols and thus */ /* how much data to copy into the log, including part of the data body if */ /* requested. */ /* ------------------------------------------------------------------------ */ int ipflog(fin, flags) fr_info_t *fin; u_int flags; { register size_t hlen; int types[2], mlen; size_t sizes[2]; void *ptrs[2]; ipflog_t ipfl; u_char p; mb_t *m; # if (SOLARIS || defined(__hpux)) && defined(_KERNEL) qif_t *ifp; # else struct ifnet *ifp; # endif /* SOLARIS || __hpux */ ipfl.fl_nattag.ipt_num[0] = 0; m = fin->fin_m; ifp = fin->fin_ifp; hlen = fin->fin_hlen; /* * calculate header size. */ if (fin->fin_off == 0) { p = fin->fin_fi.fi_p; if (p == IPPROTO_TCP) hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen); else if (p == IPPROTO_UDP) hlen += MIN(sizeof(udphdr_t), fin->fin_dlen); else if (p == IPPROTO_ICMP) { struct icmp *icmp; icmp = (struct icmp *)fin->fin_dp; /* * For ICMP, if the packet is an error packet, also * include the information about the packet which * caused the error. */ switch (icmp->icmp_type) { case ICMP_UNREACH : case ICMP_SOURCEQUENCH : case ICMP_REDIRECT : case ICMP_TIMXCEED : case ICMP_PARAMPROB : hlen += MIN(sizeof(struct icmp) + 8, fin->fin_dlen); break; default : hlen += MIN(sizeof(struct icmp), fin->fin_dlen); break; } } # ifdef USE_INET6 else if (p == IPPROTO_ICMPV6) { struct icmp6_hdr *icmp; icmp = (struct icmp6_hdr *)fin->fin_dp; /* * For ICMPV6, if the packet is an error packet, also * include the information about the packet which * caused the error. */ if (icmp->icmp6_type < 128) { hlen += MIN(sizeof(struct icmp6_hdr) + 8, fin->fin_dlen); } else { hlen += MIN(sizeof(struct icmp6_hdr), fin->fin_dlen); } } # endif } /* * Get the interface number and name to which this packet is * currently associated. */ # if (SOLARIS || defined(__hpux)) && defined(_KERNEL) ipfl.fl_unit = (u_int)ifp->qf_ppa; COPYIFNAME(ifp, ipfl.fl_ifname); # else # if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \ (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) COPYIFNAME(ifp, ipfl.fl_ifname); # else ipfl.fl_unit = (u_int)ifp->if_unit; # if defined(_KERNEL) if ((ipfl.fl_ifname[0] = ifp->if_name[0])) if ((ipfl.fl_ifname[1] = ifp->if_name[1])) if ((ipfl.fl_ifname[2] = ifp->if_name[2])) ipfl.fl_ifname[3] = ifp->if_name[3]; # else (void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname)); ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0'; # endif # endif # endif /* __hpux || SOLARIS */ mlen = fin->fin_plen - hlen; if (!ipl_logall) { mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0; } else if ((flags & FR_LOGBODY) == 0) { mlen = 0; } if (mlen < 0) mlen = 0; ipfl.fl_plen = (u_char)mlen; ipfl.fl_hlen = (u_char)hlen; ipfl.fl_rule = fin->fin_rule; (void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN); if (fin->fin_fr != NULL) { ipfl.fl_loglevel = fin->fin_fr->fr_loglevel; ipfl.fl_logtag = fin->fin_fr->fr_logtag; } else { ipfl.fl_loglevel = 0xffff; ipfl.fl_logtag = FR_NOLOGTAG; } if (fin->fin_nattag != NULL) bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag, sizeof(ipfl.fl_nattag)); ipfl.fl_flags = flags; ipfl.fl_dir = fin->fin_out; ipfl.fl_lflags = fin->fin_flx; ptrs[0] = (void *)&ipfl; sizes[0] = sizeof(ipfl); types[0] = 0; # if defined(MENTAT) && defined(_KERNEL) /* * Are we copied from the mblk or an aligned array ? */ if (fin->fin_ip == (ip_t *)m->b_rptr) { ptrs[1] = m; sizes[1] = hlen + mlen; types[1] = 1; } else { ptrs[1] = fin->fin_ip; sizes[1] = hlen + mlen; types[1] = 0; } # else ptrs[1] = m; sizes[1] = hlen + mlen; types[1] = 1; # endif /* MENTAT */ return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2); } /* ------------------------------------------------------------------------ */ /* Function: ipllog */ /* Returns: int - 0 == success, -1 == failure */ /* Parameters: dev(I) - device that owns this log record */ /* fin(I) - pointer to packet information */ /* items(I) - array of pointers to log data */ /* itemsz(I) - array of size of valid memory pointed to */ /* types(I) - type of data pointed to by items pointers */ /* cnt(I) - number of elements in arrays items/itemsz/types */ /* */ /* Takes an array of parameters and constructs one record to include the */ /* miscellaneous packet information, as well as packet data, for reading */ /* from the log device. */ /* ------------------------------------------------------------------------ */ int ipllog(dev, fin, items, itemsz, types, cnt) int dev; fr_info_t *fin; void **items; size_t *itemsz; int *types, cnt; { caddr_t buf, ptr; iplog_t *ipl; size_t len; int i; # if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL) int s; # endif /* * Check to see if this log record has a CRC which matches the last * record logged. If it does, just up the count on the previous one * rather than create a new one. */ if (ipl_suppress) { MUTEX_ENTER(&ipl_mutex); if ((fin != NULL) && (fin->fin_off == 0)) { if ((ipll[dev] != NULL) && bcmp((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE) == 0) { ipll[dev]->ipl_count++; MUTEX_EXIT(&ipl_mutex); return 0; } bcopy((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE); } else bzero((char *)&iplcrc[dev], FI_CSIZE); MUTEX_EXIT(&ipl_mutex); } /* * Get the total amount of data to be logged. */ for (i = 0, len = sizeof(iplog_t); i < cnt; i++) len += itemsz[i]; /* * check that we have space to record this information and can * allocate that much. */ KMALLOCS(buf, caddr_t, len); if (buf == NULL) return -1; SPL_NET(s); MUTEX_ENTER(&ipl_mutex); if ((iplused[dev] + len) > ipl_logsize) { MUTEX_EXIT(&ipl_mutex); SPL_X(s); KFREES(buf, len); return -1; } iplused[dev] += len; MUTEX_EXIT(&ipl_mutex); SPL_X(s); /* * advance the log pointer to the next empty record and deduct the * amount of space we're going to use. */ ipl = (iplog_t *)buf; ipl->ipl_magic = ipl_magic[dev]; ipl->ipl_count = 1; ipl->ipl_next = NULL; ipl->ipl_dsize = len; #ifdef _KERNEL GETKTIME(&ipl->ipl_sec); #else ipl->ipl_sec = 0; ipl->ipl_usec = 0; #endif /* * Loop through all the items to be logged, copying each one to the * buffer. Use bcopy for normal data or the mb_t copyout routine. */ for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) { if (types[i] == 0) { bcopy(items[i], ptr, itemsz[i]); } else if (types[i] == 1) { COPYDATA(items[i], 0, itemsz[i], ptr); } ptr += itemsz[i]; } SPL_NET(s); MUTEX_ENTER(&ipl_mutex); ipll[dev] = ipl; *iplh[dev] = ipl; iplh[dev] = &ipl->ipl_next; /* * Now that the log record has been completed and added to the queue, * wake up any listeners who may want to read it. */ # if SOLARIS && defined(_KERNEL) cv_signal(&iplwait); MUTEX_EXIT(&ipl_mutex); # else MUTEX_EXIT(&ipl_mutex); WAKEUP(iplh,dev); # endif SPL_X(s); # ifdef IPL_SELECT iplog_input_ready(dev); # endif return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipflog_read */ /* Returns: int - 0 == success, else error value. */ /* Parameters: unit(I) - device we are reading from */ /* uio(O) - pointer to information about where to store data */ /* */ /* Called to handle a read on an IPFilter device. Returns only complete */ /* log messages - will not partially copy a log record out to userland. */ /* */ /* NOTE: This function will block and wait for a signal to return data if */ /* there is none present. Asynchronous I/O is not implemented. */ /* ------------------------------------------------------------------------ */ int ipflog_read(unit, uio) minor_t unit; struct uio *uio; { size_t dlen, copied; int error = 0; iplog_t *ipl; # if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL) int s; # endif /* * Sanity checks. Make sure the minor # is valid and we're copying * a valid chunk of data. */ if (IPL_LOGMAX < unit) return ENXIO; if (uio->uio_resid == 0) return 0; if ((uio->uio_resid < sizeof(iplog_t)) || (uio->uio_resid > ipl_logsize)) return EINVAL; /* * Lock the log so we can snapshot the variables. Wait for a signal * if the log is empty. */ SPL_NET(s); MUTEX_ENTER(&ipl_mutex); while (iplt[unit] == NULL) { # if SOLARIS && defined(_KERNEL) if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) { MUTEX_EXIT(&ipl_mutex); return EINTR; } # else # if defined(__hpux) && defined(_KERNEL) lock_t *l; # ifdef IPL_SELECT if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) { /* this is no blocking system call */ MUTEX_EXIT(&ipl_mutex); return 0; } # endif MUTEX_EXIT(&ipl_mutex); l = get_sleep_lock(&iplh[unit]); error = sleep(&iplh[unit], PZERO+1); spinunlock(l); # else # if defined(__osf__) && defined(_KERNEL) error = mpsleep(&iplh[unit], PSUSP|PCATCH, "iplread", 0, &ipl_mutex, MS_LOCK_SIMPLE); # else MUTEX_EXIT(&ipl_mutex); SPL_X(s); error = SLEEP(unit + iplh, "ipl sleep"); # endif /* __osf__ */ # endif /* __hpux */ if (error) return error; SPL_NET(s); MUTEX_ENTER(&ipl_mutex); # endif /* SOLARIS */ } # if (BSD >= 199101) || defined(__FreeBSD__) || defined(__osf__) uio->uio_rw = UIO_READ; # endif for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) { dlen = ipl->ipl_dsize; if (dlen > uio->uio_resid) break; /* * Don't hold the mutex over the uiomove call. */ iplt[unit] = ipl->ipl_next; iplused[unit] -= dlen; MUTEX_EXIT(&ipl_mutex); SPL_X(s); error = UIOMOVE((caddr_t)ipl, dlen, UIO_READ, uio); if (error) { SPL_NET(s); MUTEX_ENTER(&ipl_mutex); ipl->ipl_next = iplt[unit]; iplt[unit] = ipl; iplused[unit] += dlen; break; } MUTEX_ENTER(&ipl_mutex); KFREES((caddr_t)ipl, dlen); SPL_NET(s); } if (!iplt[unit]) { iplused[unit] = 0; iplh[unit] = &iplt[unit]; ipll[unit] = NULL; } MUTEX_EXIT(&ipl_mutex); SPL_X(s); return error; } /* ------------------------------------------------------------------------ */ /* Function: ipflog_clear */ /* Returns: int - number of log bytes cleared. */ /* Parameters: unit(I) - device we are reading from */ /* */ /* Deletes all queued up log records for a given output device. */ /* ------------------------------------------------------------------------ */ int ipflog_clear(unit) minor_t unit; { iplog_t *ipl; int used; # if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL) int s; # endif SPL_NET(s); MUTEX_ENTER(&ipl_mutex); while ((ipl = iplt[unit]) != NULL) { iplt[unit] = ipl->ipl_next; KFREES((caddr_t)ipl, ipl->ipl_dsize); } iplh[unit] = &iplt[unit]; ipll[unit] = NULL; used = iplused[unit]; iplused[unit] = 0; bzero((char *)&iplcrc[unit], FI_CSIZE); MUTEX_EXIT(&ipl_mutex); SPL_X(s); return used; } #endif /* IPFILTER_LOG */