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-rw-r--r--ip_sync.c1001
1 files changed, 1001 insertions, 0 deletions
diff --git a/ip_sync.c b/ip_sync.c
new file mode 100644
index 0000000..396bae7
--- /dev/null
+++ b/ip_sync.c
@@ -0,0 +1,1001 @@
+/* $NetBSD$ */
+
+/*
+ * Copyright (C) 1995-1998 by Darren Reed.
+ *
+ * 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 <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#if !defined(_KERNEL) && !defined(__KERNEL__)
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+# define _KERNEL
+# define KERNEL
+# ifdef __OpenBSD__
+struct file;
+# endif
+# include <sys/uio.h>
+# undef _KERNEL
+# undef KERNEL
+#else
+# include <sys/systm.h>
+# if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+# endif
+#endif
+#if defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000)
+# include <sys/proc.h>
+#endif
+#if defined(_KERNEL) && (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+# if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM)
+# include "opt_ipfilter.h"
+# endif
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/time.h>
+#if !defined(linux)
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(__SVR4) || defined(__svr4__)
+# include <sys/filio.h>
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+# include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#if !defined(linux)
+# include <netinet/ip_var.h>
+#endif
+#if !defined(__hpux) && !defined(linux)
+# include <netinet/tcp_fsm.h>
+#endif
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_sync.h"
+#ifdef USE_INET6
+#include <netinet/icmp6.h>
+#endif
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+# include <sys/libkern.h>
+# include <sys/systm.h>
+# endif
+#endif
+/* END OF INCLUDES */
+
+#if !defined(lint)
+static const char rcsid[] = "@(#)Id: ip_sync.c,v 2.40.2.3 2005/02/18 13:06:29 darrenr Exp";
+#endif
+
+#define SYNC_STATETABSZ 256
+#define SYNC_NATTABSZ 256
+
+#ifdef IPFILTER_SYNC
+ipfmutex_t ipf_syncadd, ipsl_mutex;
+ipfrwlock_t ipf_syncstate, ipf_syncnat;
+#if SOLARIS && defined(_KERNEL)
+kcondvar_t ipslwait;
+#endif
+synclist_t *syncstatetab[SYNC_STATETABSZ];
+synclist_t *syncnattab[SYNC_NATTABSZ];
+synclogent_t synclog[SYNCLOG_SZ];
+syncupdent_t syncupd[SYNCLOG_SZ];
+u_int ipf_syncnum = 1;
+u_int ipf_syncwrap = 0;
+u_int sl_idx = 0, /* next available sync log entry */
+ su_idx = 0, /* next available sync update entry */
+ sl_tail = 0, /* next sync log entry to read */
+ su_tail = 0; /* next sync update entry to read */
+int ipf_sync_debug = 0;
+
+
+# if !defined(sparc) && !defined(__hppa)
+void ipfsync_tcporder __P((int, struct tcpdata *));
+void ipfsync_natorder __P((int, struct nat *));
+void ipfsync_storder __P((int, struct ipstate *));
+# endif
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_init */
+/* Returns: int - 0 == success, -1 == failure */
+/* Parameters: Nil */
+/* */
+/* Initialise all of the locks required for the sync code and initialise */
+/* any data structures, as required. */
+/* ------------------------------------------------------------------------ */
+int ipfsync_init()
+{
+ RWLOCK_INIT(&ipf_syncstate, "add things to state sync table");
+ RWLOCK_INIT(&ipf_syncnat, "add things to nat sync table");
+ MUTEX_INIT(&ipf_syncadd, "add things to sync table");
+ MUTEX_INIT(&ipsl_mutex, "add things to sync table");
+# if SOLARIS && defined(_KERNEL)
+ cv_init(&ipslwait, "ipsl condvar", CV_DRIVER, NULL);
+# endif
+
+ bzero((char *)syncnattab, sizeof(syncnattab));
+ bzero((char *)syncstatetab, sizeof(syncstatetab));
+
+ return 0;
+}
+
+
+# if !defined(sparc) && !defined(__hppa)
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_tcporder */
+/* Returns: Nil */
+/* Parameters: way(I) - direction of byte order conversion. */
+/* td(IO) - pointer to data to be converted. */
+/* */
+/* Do byte swapping on values in the TCP state information structure that */
+/* need to be used at both ends by the host in their native byte order. */
+/* ------------------------------------------------------------------------ */
+void ipfsync_tcporder(way, td)
+int way;
+tcpdata_t *td;
+{
+ if (way) {
+ td->td_maxwin = htons(td->td_maxwin);
+ td->td_end = htonl(td->td_end);
+ td->td_maxend = htonl(td->td_maxend);
+ } else {
+ td->td_maxwin = ntohs(td->td_maxwin);
+ td->td_end = ntohl(td->td_end);
+ td->td_maxend = ntohl(td->td_maxend);
+ }
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_natorder */
+/* Returns: Nil */
+/* Parameters: way(I) - direction of byte order conversion. */
+/* nat(IO) - pointer to data to be converted. */
+/* */
+/* Do byte swapping on values in the NAT data structure that need to be */
+/* used at both ends by the host in their native byte order. */
+/* ------------------------------------------------------------------------ */
+void ipfsync_natorder(way, n)
+int way;
+nat_t *n;
+{
+ if (way) {
+ n->nat_age = htonl(n->nat_age);
+ n->nat_flags = htonl(n->nat_flags);
+ n->nat_ipsumd = htonl(n->nat_ipsumd);
+ n->nat_use = htonl(n->nat_use);
+ n->nat_dir = htonl(n->nat_dir);
+ } else {
+ n->nat_age = ntohl(n->nat_age);
+ n->nat_flags = ntohl(n->nat_flags);
+ n->nat_ipsumd = ntohl(n->nat_ipsumd);
+ n->nat_use = ntohl(n->nat_use);
+ n->nat_dir = ntohl(n->nat_dir);
+ }
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_storder */
+/* Returns: Nil */
+/* Parameters: way(I) - direction of byte order conversion. */
+/* ips(IO) - pointer to data to be converted. */
+/* */
+/* Do byte swapping on values in the IP state data structure that need to */
+/* be used at both ends by the host in their native byte order. */
+/* ------------------------------------------------------------------------ */
+void ipfsync_storder(way, ips)
+int way;
+ipstate_t *ips;
+{
+ ipfsync_tcporder(way, &ips->is_tcp.ts_data[0]);
+ ipfsync_tcporder(way, &ips->is_tcp.ts_data[1]);
+
+ if (way) {
+ ips->is_hv = htonl(ips->is_hv);
+ ips->is_die = htonl(ips->is_die);
+ ips->is_pass = htonl(ips->is_pass);
+ ips->is_flags = htonl(ips->is_flags);
+ ips->is_opt = htonl(ips->is_opt);
+ ips->is_optmsk = htonl(ips->is_optmsk);
+ ips->is_sec = htons(ips->is_sec);
+ ips->is_secmsk = htons(ips->is_secmsk);
+ ips->is_auth = htons(ips->is_auth);
+ ips->is_authmsk = htons(ips->is_authmsk);
+ ips->is_s0[0] = htonl(ips->is_s0[0]);
+ ips->is_s0[1] = htonl(ips->is_s0[1]);
+ ips->is_smsk[0] = htons(ips->is_smsk[0]);
+ ips->is_smsk[1] = htons(ips->is_smsk[1]);
+ } else {
+ ips->is_hv = ntohl(ips->is_hv);
+ ips->is_die = ntohl(ips->is_die);
+ ips->is_pass = ntohl(ips->is_pass);
+ ips->is_flags = ntohl(ips->is_flags);
+ ips->is_opt = ntohl(ips->is_opt);
+ ips->is_optmsk = ntohl(ips->is_optmsk);
+ ips->is_sec = ntohs(ips->is_sec);
+ ips->is_secmsk = ntohs(ips->is_secmsk);
+ ips->is_auth = ntohs(ips->is_auth);
+ ips->is_authmsk = ntohs(ips->is_authmsk);
+ ips->is_s0[0] = ntohl(ips->is_s0[0]);
+ ips->is_s0[1] = ntohl(ips->is_s0[1]);
+ ips->is_smsk[0] = ntohl(ips->is_smsk[0]);
+ ips->is_smsk[1] = ntohl(ips->is_smsk[1]);
+ }
+}
+# else /* !defined(sparc) && !defined(__hppa) */
+# define ipfsync_tcporder(x,y)
+# define ipfsync_natorder(x,y)
+# define ipfsync_storder(x,y)
+# endif /* !defined(sparc) && !defined(__hppa) */
+
+/* enable this for debugging */
+
+# ifdef _KERNEL
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_write */
+/* Returns: int - 0 == success, else error value. */
+/* Parameters: uio(I) - pointer to information about data to write */
+/* */
+/* Moves data from user space into the kernel and uses it for updating data */
+/* structures in the state/NAT tables. */
+/* ------------------------------------------------------------------------ */
+int ipfsync_write(uio)
+struct uio *uio;
+{
+ synchdr_t sh;
+
+ /*
+ * THIS MUST BE SUFFICIENT LARGE TO STORE
+ * ANY POSSIBLE DATA TYPE
+ */
+ char data[2048];
+
+ int err = 0;
+
+# if (BSD >= 199306) || defined(__FreeBSD__) || defined(__osf__)
+ uio->uio_rw = UIO_WRITE;
+# endif
+
+ /* Try to get bytes */
+ while (uio->uio_resid > 0) {
+
+ if (uio->uio_resid >= sizeof(sh)) {
+
+ err = UIOMOVE((caddr_t)&sh, sizeof(sh), UIO_WRITE, uio);
+
+ if (err) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) failed: %d\n",
+ err);
+ return err;
+ }
+
+ /* convert to host order */
+ sh.sm_magic = ntohl(sh.sm_magic);
+ sh.sm_len = ntohl(sh.sm_len);
+ sh.sm_num = ntohl(sh.sm_num);
+
+ if (ipf_sync_debug > 8)
+ printf("[%d] Read v:%d p:%d cmd:%d table:%d rev:%d len:%d magic:%x\n",
+ sh.sm_num, sh.sm_v, sh.sm_p, sh.sm_cmd,
+ sh.sm_table, sh.sm_rev, sh.sm_len,
+ sh.sm_magic);
+
+ if (sh.sm_magic != SYNHDRMAGIC) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) invalud %s\n",
+ "magic");
+ return EINVAL;
+ }
+
+ if (sh.sm_v != 4 && sh.sm_v != 6) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) invalid %s\n",
+ "protocol");
+ return EINVAL;
+ }
+
+ if (sh.sm_cmd > SMC_MAXCMD) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) invalid %s\n",
+ "command");
+ return EINVAL;
+ }
+
+
+ if (sh.sm_table > SMC_MAXTBL) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) invalid %s\n",
+ "table");
+ return EINVAL;
+ }
+
+ } else {
+ /* unsufficient data, wait until next call */
+ if (ipf_sync_debug > 2)
+ printf("uiomove(header) insufficient data");
+ return EAGAIN;
+ }
+
+
+ /*
+ * We have a header, so try to read the amount of data
+ * needed for the request
+ */
+
+ /* not supported */
+ if (sh.sm_len == 0) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(data zero length %s\n",
+ "not supported");
+ return EINVAL;
+ }
+
+ if (uio->uio_resid >= sh.sm_len) {
+
+ err = UIOMOVE((caddr_t)data, sh.sm_len, UIO_WRITE, uio);
+
+ if (err) {
+ if (ipf_sync_debug > 2)
+ printf("uiomove(data) failed: %d\n",
+ err);
+ return err;
+ }
+
+ if (ipf_sync_debug > 7)
+ printf("uiomove(data) %d bytes read\n",
+ sh.sm_len);
+
+ if (sh.sm_table == SMC_STATE)
+ err = ipfsync_state(&sh, data);
+ else if (sh.sm_table == SMC_NAT)
+ err = ipfsync_nat(&sh, data);
+ if (ipf_sync_debug > 7)
+ printf("[%d] Finished with error %d\n",
+ sh.sm_num, err);
+
+ } else {
+ /* insufficient data, wait until next call */
+ if (ipf_sync_debug > 2)
+ printf("uiomove(data) %s %d bytes, got %d\n",
+ "insufficient data, need",
+ sh.sm_len, uio->uio_resid);
+ return EAGAIN;
+ }
+ }
+
+ /* no more data */
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_read */
+/* Returns: int - 0 == success, else error value. */
+/* Parameters: uio(O) - pointer to information about where to store data */
+/* */
+/* This function is called when a user program wants to read some data */
+/* for pending state/NAT updates. If no data is available, the caller is */
+/* put to sleep, pending a wakeup from the "lower half" of this code. */
+/* ------------------------------------------------------------------------ */
+int ipfsync_read(uio)
+struct uio *uio;
+{
+ syncupdent_t *su;
+ synclogent_t *sl;
+ int err = 0;
+
+ if ((uio->uio_resid & 3) || (uio->uio_resid < 8))
+ return EINVAL;
+
+# if (BSD >= 199306) || defined(__FreeBSD__) || defined(__osf__)
+ uio->uio_rw = UIO_READ;
+# endif
+
+ MUTEX_ENTER(&ipsl_mutex);
+ while ((sl_tail == sl_idx) && (su_tail == su_idx)) {
+# if SOLARIS && defined(_KERNEL)
+ if (!cv_wait_sig(&ipslwait, &ipsl_mutex)) {
+ MUTEX_EXIT(&ipsl_mutex);
+ return EINTR;
+ }
+# else
+# ifdef __hpux
+ {
+ lock_t *l;
+
+ l = get_sleep_lock(&sl_tail);
+ err = sleep(&sl_tail, PZERO+1);
+ spinunlock(l);
+ }
+# else /* __hpux */
+# ifdef __osf__
+ err = mpsleep(&sl_tail, PSUSP|PCATCH, "ipl sleep", 0,
+ &ipsl_mutex, MS_LOCK_SIMPLE);
+# else
+ MUTEX_EXIT(&ipsl_mutex);
+ err = SLEEP(&sl_tail, "ipl sleep");
+# endif /* __osf__ */
+# endif /* __hpux */
+ if (err) {
+ MUTEX_EXIT(&ipsl_mutex);
+ return err;
+ }
+# endif /* SOLARIS */
+ }
+ MUTEX_EXIT(&ipsl_mutex);
+
+ READ_ENTER(&ipf_syncstate);
+ while ((sl_tail < sl_idx) && (uio->uio_resid > sizeof(*sl))) {
+ sl = synclog + sl_tail++;
+ err = UIOMOVE((caddr_t)sl, sizeof(*sl), UIO_READ, uio);
+ if (err != 0)
+ break;
+ }
+
+ while ((su_tail < su_idx) && (uio->uio_resid > sizeof(*su))) {
+ su = syncupd + su_tail;
+ su_tail++;
+ err = UIOMOVE((caddr_t)su, sizeof(*su), UIO_READ, uio);
+ if (err != 0)
+ break;
+ if (su->sup_hdr.sm_sl != NULL)
+ su->sup_hdr.sm_sl->sl_idx = -1;
+ }
+
+ MUTEX_ENTER(&ipf_syncadd);
+ if (su_tail == su_idx)
+ su_tail = su_idx = 0;
+ if (sl_tail == sl_idx)
+ sl_tail = sl_idx = 0;
+ MUTEX_EXIT(&ipf_syncadd);
+ RWLOCK_EXIT(&ipf_syncstate);
+ return err;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_state */
+/* Returns: int - 0 == success, else error value. */
+/* Parameters: sp(I) - pointer to sync packet data header */
+/* uio(I) - pointer to user data for further information */
+/* */
+/* Updates the state table according to information passed in the sync */
+/* header. As required, more data is fetched from the uio structure but */
+/* varies depending on the contents of the sync header. This function can */
+/* create a new state entry or update one. Deletion is left to the state */
+/* structures being timed out correctly. */
+/* ------------------------------------------------------------------------ */
+int ipfsync_state(sp, data)
+synchdr_t *sp;
+void *data;
+{
+ synctcp_update_t su;
+ ipstate_t *is, sn;
+ synclist_t *sl;
+ frentry_t *fr;
+ u_int hv;
+ int err = 0;
+
+ hv = sp->sm_num & (SYNC_STATETABSZ - 1);
+
+ switch (sp->sm_cmd)
+ {
+ case SMC_CREATE :
+
+ bcopy(data, &sn, sizeof(sn));
+ KMALLOC(is, ipstate_t *);
+ if (is == NULL) {
+ err = ENOMEM;
+ break;
+ }
+
+ KMALLOC(sl, synclist_t *);
+ if (sl == NULL) {
+ err = ENOMEM;
+ KFREE(is);
+ break;
+ }
+
+ bzero((char *)is, offsetof(ipstate_t, is_die));
+ bcopy((char *)&sn.is_die, (char *)&is->is_die,
+ sizeof(*is) - offsetof(ipstate_t, is_die));
+ ipfsync_storder(0, is);
+
+ /*
+ * We need to find the same rule on the slave as was used on
+ * the master to create this state entry.
+ */
+ READ_ENTER(&ipf_mutex);
+ fr = fr_getrulen(IPL_LOGIPF, sn.is_group, sn.is_rulen);
+ if (fr != NULL) {
+ MUTEX_ENTER(&fr->fr_lock);
+ fr->fr_ref++;
+ fr->fr_statecnt++;
+ MUTEX_EXIT(&fr->fr_lock);
+ }
+ RWLOCK_EXIT(&ipf_mutex);
+
+ if (ipf_sync_debug > 4)
+ printf("[%d] Filter rules = %p\n", sp->sm_num, fr);
+
+ is->is_rule = fr;
+ is->is_sync = sl;
+
+ sl->sl_idx = -1;
+ sl->sl_ips = is;
+ bcopy(sp, &sl->sl_hdr, sizeof(struct synchdr));
+
+ WRITE_ENTER(&ipf_syncstate);
+ WRITE_ENTER(&ipf_state);
+
+ sl->sl_pnext = syncstatetab + hv;
+ sl->sl_next = syncstatetab[hv];
+ if (syncstatetab[hv] != NULL)
+ syncstatetab[hv]->sl_pnext = &sl->sl_next;
+ syncstatetab[hv] = sl;
+ MUTEX_DOWNGRADE(&ipf_syncstate);
+ fr_stinsert(is, sp->sm_rev);
+ /*
+ * Do not initialise the interface pointers for the state
+ * entry as the full complement of interface names may not
+ * be present.
+ *
+ * Put this state entry on its timeout queue.
+ */
+ /*fr_setstatequeue(is, sp->sm_rev);*/
+ break;
+
+ case SMC_UPDATE :
+ bcopy(data, &su, sizeof(su));
+
+ if (ipf_sync_debug > 4)
+ printf("[%d] Update age %lu state %d/%d \n",
+ sp->sm_num, su.stu_age, su.stu_state[0],
+ su.stu_state[1]);
+
+ READ_ENTER(&ipf_syncstate);
+ for (sl = syncstatetab[hv]; (sl != NULL); sl = sl->sl_next)
+ if (sl->sl_hdr.sm_num == sp->sm_num)
+ break;
+ if (sl == NULL) {
+ if (ipf_sync_debug > 1)
+ printf("[%d] State not found - can't update\n",
+ sp->sm_num);
+ RWLOCK_EXIT(&ipf_syncstate);
+ err = ENOENT;
+ break;
+ }
+
+ READ_ENTER(&ipf_state);
+
+ if (ipf_sync_debug > 6)
+ printf("[%d] Data from state v:%d p:%d cmd:%d table:%d rev:%d\n",
+ sp->sm_num, sl->sl_hdr.sm_v, sl->sl_hdr.sm_p,
+ sl->sl_hdr.sm_cmd, sl->sl_hdr.sm_table,
+ sl->sl_hdr.sm_rev);
+
+ is = sl->sl_ips;
+
+ MUTEX_ENTER(&is->is_lock);
+ switch (sp->sm_p)
+ {
+ case IPPROTO_TCP :
+ /* XXX FV --- shouldn't we do ntohl/htonl???? XXX */
+ is->is_send = su.stu_data[0].td_end;
+ is->is_maxsend = su.stu_data[0].td_maxend;
+ is->is_maxswin = su.stu_data[0].td_maxwin;
+ is->is_state[0] = su.stu_state[0];
+ is->is_dend = su.stu_data[1].td_end;
+ is->is_maxdend = su.stu_data[1].td_maxend;
+ is->is_maxdwin = su.stu_data[1].td_maxwin;
+ is->is_state[1] = su.stu_state[1];
+ break;
+ default :
+ break;
+ }
+
+ if (ipf_sync_debug > 6)
+ printf("[%d] Setting timers for state\n", sp->sm_num);
+
+ fr_setstatequeue(is, sp->sm_rev);
+
+ MUTEX_EXIT(&is->is_lock);
+ break;
+
+ default :
+ err = EINVAL;
+ break;
+ }
+
+ if (err == 0) {
+ RWLOCK_EXIT(&ipf_state);
+ RWLOCK_EXIT(&ipf_syncstate);
+ }
+
+ if (ipf_sync_debug > 6)
+ printf("[%d] Update completed with error %d\n",
+ sp->sm_num, err);
+
+ return err;
+}
+# endif /* _KERNEL */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_del */
+/* Returns: Nil */
+/* Parameters: sl(I) - pointer to synclist object to delete */
+/* */
+/* Deletes an object from the synclist table and free's its memory. */
+/* ------------------------------------------------------------------------ */
+void ipfsync_del(sl)
+synclist_t *sl;
+{
+ WRITE_ENTER(&ipf_syncstate);
+ *sl->sl_pnext = sl->sl_next;
+ if (sl->sl_next != NULL)
+ sl->sl_next->sl_pnext = sl->sl_pnext;
+ if (sl->sl_idx != -1)
+ syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL;
+ RWLOCK_EXIT(&ipf_syncstate);
+ KFREE(sl);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_nat */
+/* Returns: int - 0 == success, else error value. */
+/* Parameters: sp(I) - pointer to sync packet data header */
+/* uio(I) - pointer to user data for further information */
+/* */
+/* Updates the NAT table according to information passed in the sync */
+/* header. As required, more data is fetched from the uio structure but */
+/* varies depending on the contents of the sync header. This function can */
+/* create a new NAT entry or update one. Deletion is left to the NAT */
+/* structures being timed out correctly. */
+/* ------------------------------------------------------------------------ */
+int ipfsync_nat(sp, data)
+synchdr_t *sp;
+void *data;
+{
+ synclogent_t sle;
+ syncupdent_t su;
+ nat_t *n, *nat;
+ synclist_t *sl;
+ u_int hv = 0;
+ int err;
+
+ READ_ENTER(&ipf_syncstate);
+
+ switch (sp->sm_cmd)
+ {
+ case SMC_CREATE :
+ bcopy(data, &sle, sizeof(sle));
+
+ KMALLOC(n, nat_t *);
+ if (n == NULL) {
+ err = ENOMEM;
+ break;
+ }
+
+ KMALLOC(sl, synclist_t *);
+ if (sl == NULL) {
+ err = ENOMEM;
+ KFREE(n);
+ break;
+ }
+
+ WRITE_ENTER(&ipf_nat);
+
+ nat = &sle.sle_un.sleu_ipn;
+ bzero((char *)n, offsetof(nat_t, nat_age));
+ bcopy((char *)&nat->nat_age, (char *)&n->nat_age,
+ sizeof(*n) - offsetof(nat_t, nat_age));
+ ipfsync_natorder(0, n);
+ n->nat_sync = sl;
+
+ sl->sl_idx = -1;
+ sl->sl_ipn = n;
+ sl->sl_num = ntohl(sp->sm_num);
+ sl->sl_pnext = syncstatetab + hv;
+ sl->sl_next = syncstatetab[hv];
+ if (syncstatetab[hv] != NULL)
+ syncstatetab[hv]->sl_pnext = &sl->sl_next;
+ syncstatetab[hv] = sl;
+ nat_insert(n, sl->sl_rev);
+ RWLOCK_EXIT(&ipf_nat);
+ break;
+
+ case SMC_UPDATE :
+ bcopy(data, &su, sizeof(su));
+
+ READ_ENTER(&ipf_syncstate);
+ for (sl = syncstatetab[hv]; (sl != NULL); sl = sl->sl_next)
+ if (sl->sl_hdr.sm_num == sp->sm_num)
+ break;
+ if (sl == NULL) {
+ err = ENOENT;
+ break;
+ }
+
+ READ_ENTER(&ipf_nat);
+
+ nat = sl->sl_ipn;
+
+ MUTEX_ENTER(&nat->nat_lock);
+ fr_setnatqueue(nat, sl->sl_rev);
+ MUTEX_EXIT(&nat->nat_lock);
+
+ RWLOCK_EXIT(&ipf_nat);
+
+ break;
+
+ default :
+ err = EINVAL;
+ break;
+ }
+
+ RWLOCK_EXIT(&ipf_syncstate);
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_new */
+/* Returns: synclist_t* - NULL == failure, else pointer to new synclist */
+/* data structure. */
+/* Parameters: tab(I) - type of synclist_t to create */
+/* fin(I) - pointer to packet information */
+/* ptr(I) - pointer to owning object */
+/* */
+/* Creates a new sync table entry and notifies any sleepers that it's there */
+/* waiting to be processed. */
+/* ------------------------------------------------------------------------ */
+synclist_t *ipfsync_new(tab, fin, ptr)
+int tab;
+fr_info_t *fin;
+void *ptr;
+{
+ synclist_t *sl, *ss;
+ synclogent_t *sle;
+ u_int hv, sz;
+
+ if (sl_idx == SYNCLOG_SZ)
+ return NULL;
+ KMALLOC(sl, synclist_t *);
+ if (sl == NULL)
+ return NULL;
+
+ MUTEX_ENTER(&ipf_syncadd);
+ /*
+ * Get a unique number for this synclist_t. The number is only meant
+ * to be unique for the lifetime of the structure and may be reused
+ * later.
+ */
+ ipf_syncnum++;
+ if (ipf_syncnum == 0) {
+ ipf_syncnum = 1;
+ ipf_syncwrap = 1;
+ }
+
+ hv = ipf_syncnum & (SYNC_STATETABSZ - 1);
+ while (ipf_syncwrap != 0) {
+ for (ss = syncstatetab[hv]; ss; ss = ss->sl_next)
+ if (ss->sl_hdr.sm_num == ipf_syncnum)
+ break;
+ if (ss == NULL)
+ break;
+ ipf_syncnum++;
+ hv = ipf_syncnum & (SYNC_STATETABSZ - 1);
+ }
+ /*
+ * Use the synch number of the object as the hash key. Should end up
+ * with relatively even distribution over time.
+ * XXX - an attacker could lunch an DoS attack, of sorts, if they are
+ * the only one causing new table entries by only keeping open every
+ * nth connection they make, where n is a value in the interval
+ * [0, SYNC_STATETABSZ-1].
+ */
+ sl->sl_pnext = syncstatetab + hv;
+ sl->sl_next = syncstatetab[hv];
+ syncstatetab[hv] = sl;
+ sl->sl_num = ipf_syncnum;
+ MUTEX_EXIT(&ipf_syncadd);
+
+ sl->sl_magic = htonl(SYNHDRMAGIC);
+ sl->sl_v = fin->fin_v;
+ sl->sl_p = fin->fin_p;
+ sl->sl_cmd = SMC_CREATE;
+ sl->sl_idx = -1;
+ sl->sl_table = tab;
+ sl->sl_rev = fin->fin_rev;
+ if (tab == SMC_STATE) {
+ sl->sl_ips = ptr;
+ sz = sizeof(*sl->sl_ips);
+ } else if (tab == SMC_NAT) {
+ sl->sl_ipn = ptr;
+ sz = sizeof(*sl->sl_ipn);
+ } else {
+ ptr = NULL;
+ sz = 0;
+ }
+ sl->sl_len = sz;
+
+ /*
+ * Create the log entry to be read by a user daemon. When it has been
+ * finished and put on the queue, send a signal to wakeup any waiters.
+ */
+ MUTEX_ENTER(&ipf_syncadd);
+ sle = synclog + sl_idx++;
+ bcopy((char *)&sl->sl_hdr, (char *)&sle->sle_hdr,
+ sizeof(sle->sle_hdr));
+ sle->sle_hdr.sm_num = htonl(sle->sle_hdr.sm_num);
+ sle->sle_hdr.sm_len = htonl(sle->sle_hdr.sm_len);
+ if (ptr != NULL) {
+ bcopy((char *)ptr, (char *)&sle->sle_un, sz);
+ if (tab == SMC_STATE) {
+ ipfsync_storder(1, &sle->sle_un.sleu_ips);
+ } else if (tab == SMC_NAT) {
+ ipfsync_natorder(1, &sle->sle_un.sleu_ipn);
+ }
+ }
+ MUTEX_EXIT(&ipf_syncadd);
+
+ MUTEX_ENTER(&ipsl_mutex);
+# if SOLARIS
+# ifdef _KERNEL
+ cv_signal(&ipslwait);
+# endif
+ MUTEX_EXIT(&ipsl_mutex);
+# else
+ MUTEX_EXIT(&ipsl_mutex);
+# ifdef _KERNEL
+ wakeup(&sl_tail);
+# endif
+# endif
+ return sl;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipfsync_update */
+/* Returns: Nil */
+/* Parameters: tab(I) - type of synclist_t to create */
+/* fin(I) - pointer to packet information */
+/* sl(I) - pointer to synchronisation object */
+/* */
+/* For outbound packets, only, create an sync update record for the user */
+/* process to read. */
+/* ------------------------------------------------------------------------ */
+void ipfsync_update(tab, fin, sl)
+int tab;
+fr_info_t *fin;
+synclist_t *sl;
+{
+ synctcp_update_t *st;
+ syncupdent_t *slu;
+ ipstate_t *ips;
+ nat_t *nat;
+
+ if (fin->fin_out == 0 || sl == NULL)
+ return;
+
+ WRITE_ENTER(&ipf_syncstate);
+ MUTEX_ENTER(&ipf_syncadd);
+ if (sl->sl_idx == -1) {
+ slu = syncupd + su_idx;
+ sl->sl_idx = su_idx++;
+ bcopy((char *)&sl->sl_hdr, (char *)&slu->sup_hdr,
+ sizeof(slu->sup_hdr));
+ slu->sup_hdr.sm_magic = htonl(SYNHDRMAGIC);
+ slu->sup_hdr.sm_sl = sl;
+ slu->sup_hdr.sm_cmd = SMC_UPDATE;
+ slu->sup_hdr.sm_table = tab;
+ slu->sup_hdr.sm_num = htonl(sl->sl_num);
+ slu->sup_hdr.sm_len = htonl(sizeof(struct synctcp_update));
+ slu->sup_hdr.sm_rev = fin->fin_rev;
+# if 0
+ if (fin->fin_p == IPPROTO_TCP) {
+ st->stu_len[0] = 0;
+ st->stu_len[1] = 0;
+ }
+# endif
+ } else
+ slu = syncupd + sl->sl_idx;
+ MUTEX_EXIT(&ipf_syncadd);
+ MUTEX_DOWNGRADE(&ipf_syncstate);
+
+ /*
+ * Only TCP has complex timeouts, others just use default timeouts.
+ * For TCP, we only need to track the connection state and window.
+ */
+ if (fin->fin_p == IPPROTO_TCP) {
+ st = &slu->sup_tcp;
+ if (tab == SMC_STATE) {
+ ips = sl->sl_ips;
+ st->stu_age = htonl(ips->is_die);
+ st->stu_data[0].td_end = ips->is_send;
+ st->stu_data[0].td_maxend = ips->is_maxsend;
+ st->stu_data[0].td_maxwin = ips->is_maxswin;
+ st->stu_state[0] = ips->is_state[0];
+ st->stu_data[1].td_end = ips->is_dend;
+ st->stu_data[1].td_maxend = ips->is_maxdend;
+ st->stu_data[1].td_maxwin = ips->is_maxdwin;
+ st->stu_state[1] = ips->is_state[1];
+ } else if (tab == SMC_NAT) {
+ nat = sl->sl_ipn;
+ st->stu_age = htonl(nat->nat_age);
+ }
+ }
+ RWLOCK_EXIT(&ipf_syncstate);
+
+ MUTEX_ENTER(&ipsl_mutex);
+# if SOLARIS
+# ifdef _KERNEL
+ cv_signal(&ipslwait);
+# endif
+ MUTEX_EXIT(&ipsl_mutex);
+# else
+ MUTEX_EXIT(&ipsl_mutex);
+# ifdef _KERNEL
+ wakeup(&sl_tail);
+# endif
+# endif
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_sync_ioctl */
+/* Returns: int - 0 == success, != 0 == failure */
+/* Parameters: data(I) - pointer to ioctl data */
+/* cmd(I) - ioctl command integer */
+/* mode(I) - file mode bits used with open */
+/* */
+/* This function currently does not handle any ioctls and so just returns */
+/* EINVAL on all occasions. */
+/* ------------------------------------------------------------------------ */
+int fr_sync_ioctl(data, cmd, mode)
+caddr_t data;
+ioctlcmd_t cmd;
+int mode;
+{
+ return EINVAL;
+}
+#endif /* IPFILTER_SYNC */
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