diff options
Diffstat (limited to 'sys/netinet/ip_log.c')
| -rw-r--r-- | sys/netinet/ip_log.c | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/sys/netinet/ip_log.c b/sys/netinet/ip_log.c new file mode 100644 index 0000000..082a0a3 --- /dev/null +++ b/sys/netinet/ip_log.c @@ -0,0 +1,507 @@ +/* + * Copyright (C) 1997-2000 by Darren Reed. + * + * 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. + * + * $Id: ip_log.c,v 2.5.2.1 2000/07/19 13:11:47 darrenr Exp $ + * $FreeBSD$ + */ +#include <sys/param.h> +#if defined(KERNEL) && !defined(_KERNEL) +# define _KERNEL +#endif +#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) +# include "opt_ipfilter_log.h" +#endif +#ifdef __FreeBSD__ +# if defined(IPFILTER_LKM) || defined(_KERNEL) +# if !defined(__FreeBSD_version) +# include <sys/osreldate.h> +# endif +# if !defined(IPFILTER_LKM) +# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) +# include "opt_ipfilter.h" +# endif +# endif +# else +# ifdef KLD_MODULE +# include <osreldate.h> +# endif +# endif +#endif +#ifdef IPFILTER_LOG +# ifndef SOLARIS +# define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) +# endif +# ifndef _KERNEL +# include <stdio.h> +# include <string.h> +# include <stdlib.h> +# include <ctype.h> +# endif +# include <sys/errno.h> +# include <sys/types.h> +# include <sys/file.h> +# if __FreeBSD_version >= 220000 && defined(_KERNEL) +# include <sys/fcntl.h> +# include <sys/filio.h> +# else +# include <sys/ioctl.h> +# endif +# include <sys/time.h> +# if defined(_KERNEL) && !defined(linux) +# include <sys/systm.h> +# endif +# include <sys/uio.h> +# if !SOLARIS +# if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000) +# include <sys/dirent.h> +# else +# include <sys/dir.h> +# endif +# ifndef linux +# include <sys/mbuf.h> +# endif +# else +# include <sys/filio.h> +# include <sys/cred.h> +# include <sys/ddi.h> +# include <sys/sunddi.h> +# include <sys/ksynch.h> +# include <sys/kmem.h> +# include <sys/mkdev.h> +# include <sys/dditypes.h> +# include <sys/cmn_err.h> +# endif +# ifndef linux +# include <sys/protosw.h> +# endif +# include <sys/socket.h> + +# include <net/if.h> +# ifdef sun +# include <net/af.h> +# endif +# if __FreeBSD_version >= 300000 +# include <net/if_var.h> +# endif +# include <net/route.h> +# include <netinet/in.h> +# ifdef __sgi +# include <sys/ddi.h> +# ifdef IFF_DRVRLOCK /* IRIX6 */ +# include <sys/hashing.h> +# endif +# endif +# if !defined(linux) && !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/ +# include <netinet/in_var.h> +# endif +# include <netinet/in_systm.h> +# include <netinet/ip.h> +# include <netinet/tcp.h> +# include <netinet/udp.h> +# include <netinet/ip_icmp.h> +# ifndef linux +# include <netinet/ip_var.h> +# endif +# ifndef _KERNEL +# include <syslog.h> +# endif +# include "netinet/ip_compat.h" +# include <netinet/tcpip.h> +# include "netinet/ip_fil.h" +# include "netinet/ip_proxy.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) +# include <sys/malloc.h> +# endif + +# ifndef MIN +# define MIN(a,b) (((a)<(b))?(a):(b)) +# endif + + +# if SOLARIS || defined(__sgi) +extern kmutex_t ipl_mutex; +# if SOLARIS +extern kcondvar_t iplwait; +# endif +# endif + +iplog_t **iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1], *ipll[IPL_LOGMAX+1]; +size_t iplused[IPL_LOGMAX+1]; +static fr_info_t iplcrc[IPL_LOGMAX+1]; +# ifdef linux +static struct wait_queue *iplwait[IPL_LOGMAX+1]; +# endif + + +/* + * Initialise log buffers & pointers. Also iniialised the CRC to a local + * secret for use in calculating the "last log checksum". + */ +void ipflog_init() +{ + 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])); + } +} + + +/* + * ipflog + * 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(flags, ip, fin, m) +u_int flags; +ip_t *ip; +fr_info_t *fin; +mb_t *m; +{ + ipflog_t ipfl; + register size_t mlen, hlen; + size_t sizes[2]; + void *ptrs[2]; + int types[2]; + u_char p; +# if SOLARIS + ill_t *ifp = fin->fin_ifp; +# else + struct ifnet *ifp = fin->fin_ifp; +# endif + + /* + * calculate header size. + */ + hlen = fin->fin_hlen; + 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; + } + } + } + /* + * Get the interface number and name to which this packet is + * currently associated. + */ +# if SOLARIS + ipfl.fl_unit = (u_char)ifp->ill_ppa; + bcopy(ifp->ill_name, ipfl.fl_ifname, MIN(ifp->ill_name_length, 4)); + mlen = (flags & FR_LOGBODY) ? MIN(msgdsize(m) - hlen, 128) : 0; +# else +# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \ + (defined(OpenBSD) && (OpenBSD >= 199603)) + strncpy(ipfl.fl_ifname, ifp->if_xname, IFNAMSIZ); +# else +# ifndef linux + ipfl.fl_unit = (u_char)ifp->if_unit; +# endif + 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]; +# endif + mlen = (flags & FR_LOGBODY) ? MIN(fin->fin_plen - hlen, 128) : 0; +# endif + ipfl.fl_plen = (u_char)mlen; + ipfl.fl_hlen = (u_char)hlen; + ipfl.fl_rule = fin->fin_rule; + ipfl.fl_group = fin->fin_group; + if (fin->fin_fr != NULL) + ipfl.fl_loglevel = fin->fin_fr->fr_loglevel; + else + ipfl.fl_loglevel = 0xffff; + ipfl.fl_flags = flags; + ptrs[0] = (void *)&ipfl; + sizes[0] = sizeof(ipfl); + types[0] = 0; +# if SOLARIS + /* + * Are we copied from the mblk or an aligned array ? + */ + if (ip == (ip_t *)m->b_rptr) { + ptrs[1] = m; + sizes[1] = hlen + mlen; + types[1] = 1; + } else { + ptrs[1] = ip; + sizes[1] = hlen + mlen; + types[1] = 0; + } +# else + ptrs[1] = m; + sizes[1] = hlen + mlen; + types[1] = 1; +# endif + return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2); +} + + +/* + * ipllog + */ +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, s; + iplog_t *ipl; + size_t len; + int i; + + /* + * 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. + */ + MUTEX_ENTER(&ipl_mutex); + if (fin != NULL) { + if ((ipll[dev] != NULL) && + bcmp((char *)fin, (char *)&iplcrc[dev], FI_CSIZE) == 0) { + ipll[dev]->ipl_count++; + MUTEX_EXIT(&ipl_mutex); + return 1; + } + bcopy((char *)fin, (char *)&iplcrc[dev], FI_CSIZE); + } 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) + return 0; + MUTEX_ENTER(&ipl_mutex); + if ((iplused[dev] + len) > IPLLOGSIZE) { + MUTEX_EXIT(&ipl_mutex); + KFREES(buf, len); + return 0; + } + iplused[dev] += len; + MUTEX_EXIT(&ipl_mutex); + + /* + * 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; + ipl->ipl_count = 1; + ipl->ipl_next = NULL; + ipl->ipl_dsize = len; +# if SOLARIS || defined(sun) || defined(linux) + uniqtime((struct timeval *)&ipl->ipl_sec); +# else +# if BSD >= 199306 || defined(__FreeBSD__) || defined(__sgi) + microtime((struct timeval *)&ipl->ipl_sec); +# endif +# 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, s = buf + sizeof(*ipl); i < cnt; i++) { + if (types[i] == 0) + bcopy(items[i], s, itemsz[i]); + else if (types[i] == 1) { +# if SOLARIS + copyout_mblk(items[i], 0, itemsz[i], s); +# else + m_copydata(items[i], 0, itemsz[i], s); +# endif + } + s += itemsz[i]; + } + MUTEX_ENTER(&ipl_mutex); + ipll[dev] = ipl; + *iplh[dev] = ipl; + iplh[dev] = &ipl->ipl_next; +# if SOLARIS + cv_signal(&iplwait); + mutex_exit(&ipl_mutex); +# else + MUTEX_EXIT(&ipl_mutex); +# ifdef linux + wake_up_interruptible(&iplwait[dev]); +# else + wakeup(&iplh[dev]); +# endif +# endif + return 1; +} + + +int ipflog_read(unit, uio) +minor_t unit; +struct uio *uio; +{ + size_t dlen, copied; + int error = 0; + iplog_t *ipl; +# if defined(_KERNEL) && !SOLARIS + 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) + return 0; + if ((uio->uio_resid < sizeof(iplog_t)) || + (uio->uio_resid > IPLLOGSIZE)) + 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 (!iplused[unit] || !iplt[unit]) { +# if SOLARIS && defined(_KERNEL) + if (!cv_wait_sig(&iplwait, &ipl_mutex)) { + MUTEX_EXIT(&ipl_mutex); + return EINTR; + } +# else +# ifdef linux + interruptible_sleep_on(&iplwait[unit]); + if (current->signal & ~current->blocked) + return -EINTR; +# else + MUTEX_EXIT(&ipl_mutex); + SPL_X(s); + error = SLEEP(&iplh[unit], "ipl sleep"); + if (error) + return error; + SPL_NET(s); + MUTEX_ENTER(&ipl_mutex); +# endif /* linux */ +# endif /* SOLARIS */ + } + +# if BSD >= 199306 || defined(__FreeBSD__) + uio->uio_rw = UIO_READ; +# endif + + for (copied = 0; (ipl = iplt[unit]); 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; + } + KFREES((caddr_t)ipl, dlen); + SPL_NET(s); + MUTEX_ENTER(&ipl_mutex); + } + if (!iplt[unit]) { + iplused[unit] = 0; + iplh[unit] = &iplt[unit]; + ipll[unit] = NULL; + } + + MUTEX_EXIT(&ipl_mutex); + SPL_X(s); +# ifdef linux + if (!error) + return (int)copied; + return -error; +# else + return error; +# endif +} + + +int ipflog_clear(unit) +minor_t unit; +{ + iplog_t *ipl; + int used; + + MUTEX_ENTER(&ipl_mutex); + while ((ipl = iplt[unit])) { + 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); + return used; +} +#endif /* IPFILTER_LOG */ |
