/* $NetBSD: ip_sync.c,v 1.1.1.6 2008/05/20 06:44:24 darrenr Exp $ */ /* * 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 #include #include #include #if !defined(_KERNEL) && !defined(__KERNEL__) # include # include # include # define _KERNEL # define KERNEL # ifdef __OpenBSD__ struct file; # endif # include # undef _KERNEL # undef KERNEL #else # include # if !defined(__SVR4) && !defined(__svr4__) # include # endif # include # if __FreeBSD_version >= 500000 # include # endif #endif #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) # include #endif #if defined(_KERNEL) && (__FreeBSD_version >= 220000) # include # include # if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM) # include "opt_ipfilter.h" # endif #else # include #endif #include #if !defined(linux) # include #endif #include #if defined(__SVR4) || defined(__svr4__) # include # include # ifdef _KERNEL # include # endif # include # include #endif #include #ifdef sun # include #endif #include #include #include #include #include #if !defined(linux) # include #endif #if !defined(__hpux) && !defined(linux) # include #endif #include #include #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_proxy.h" #include "netinet/ip_sync.h" #ifdef USE_INET6 #include #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[] = "@(#)Id: ip_sync.c,v 2.40.2.12 2008/02/09 18:28:08 darrenr Exp"; #endif #define SYNC_STATETABSZ 256 #define SYNC_NATTABSZ 256 #ifdef IPFILTER_SYNC # if SOLARIS && defined(_KERNEL) extern struct pollhead iplpollhead[IPL_LOGSIZE]; # endif 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[0] = htonl(ips->is_opt[0]); ips->is_opt[1] = htonl(ips->is_opt[1]); ips->is_optmsk[0] = htonl(ips->is_optmsk[0]); ips->is_optmsk[1] = htonl(ips->is_optmsk[1]); 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[0] = ntohl(ips->is_opt[0]); ips->is_opt[1] = ntohl(ips->is_opt[1]); ips->is_optmsk[0] = ntohl(ips->is_optmsk[0]); ips->is_optmsk[1] = ntohl(ips->is_optmsk[1]); 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(&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(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); if (err) { MUTEX_EXIT(&ipsl_mutex); return EINTR; } spinunlock(l); } # else /* __hpux */ # ifdef __osf__ err = mpsleep(&sl_tail, PSUSP|PCATCH, "ipl sleep", 0, &ipsl_mutex, MS_LOCK_SIMPLE); if (err) return EINTR; # else MUTEX_EXIT(&ipsl_mutex); err = SLEEP(&sl_tail, "ipl sleep"); if (err) return EINTR; MUTEX_ENTER(&ipsl_mutex); # endif /* __osf__ */ # endif /* __hpux */ # 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(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(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; { syncupdent_t su; nat_t *n, *nat; synclist_t *sl; u_int hv = 0; int err; READ_ENTER(&ipf_syncnat); switch (sp->sm_cmd) { case SMC_CREATE : KMALLOC(n, nat_t *); if (n == NULL) { err = ENOMEM; break; } KMALLOC(sl, synclist_t *); if (sl == NULL) { err = ENOMEM; KFREE(n); break; } nat = (nat_t *)data; 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); WRITE_ENTER(&ipf_nat); sl->sl_pnext = syncnattab + hv; sl->sl_next = syncnattab[hv]; if (syncnattab[hv] != NULL) syncnattab[hv]->sl_pnext = &sl->sl_next; syncnattab[hv] = sl; nat_insert(n, sl->sl_rev); RWLOCK_EXIT(&ipf_nat); break; case SMC_UPDATE : bcopy(data, &su, sizeof(su)); READ_ENTER(&ipf_syncnat); for (sl = syncnattab[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_syncnat); 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; } /* * 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]. */ if (tab == SMC_STATE) { 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); } sl->sl_pnext = syncstatetab + hv; sl->sl_next = syncstatetab[hv]; syncstatetab[hv] = sl; } else { hv = ipf_syncnum & (SYNC_NATTABSZ - 1); while (ipf_syncwrap != 0) { for (ss = syncnattab[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); } sl->sl_pnext = syncnattab + hv; sl->sl_next = syncnattab[hv]; syncnattab[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 { sl->sl_ipn = ptr; sz = sizeof(*sl->sl_ipn); } 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); pollwakeup(&iplpollhead[IPL_LOGSYNC], POLLIN|POLLRDNORM); # endif MUTEX_EXIT(&ipsl_mutex); # else MUTEX_EXIT(&ipsl_mutex); # ifdef _KERNEL wakeup(&sl_tail); POLLWAKEUP(IPL_LOGSYNC); # 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); pollwakeup(&iplpollhead[IPL_LOGSYNC], POLLIN|POLLRDNORM); # endif MUTEX_EXIT(&ipsl_mutex); # else MUTEX_EXIT(&ipsl_mutex); # ifdef _KERNEL wakeup(&sl_tail); POLLWAKEUP(IPL_LOGSYNC); # 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, uid, ctx) caddr_t data; ioctlcmd_t cmd; int mode, uid; void *ctx; { return EINVAL; } int ipfsync_canread() { return !((sl_tail == sl_idx) && (su_tail == su_idx)); } int ipfsync_canwrite() { return 1; } #endif /* IPFILTER_SYNC */