/* * Copyright (C) 1993-2001, 2003 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #if !defined(lint) static const char sccsid[] = "@(#)ip_fil_solaris.c 1.7 07/22/06 (C) 1993-2000 Darren Reed"; static const char rcsid[] = "@(#)$Id: ip_fil_solaris.c,v 2.62.2.19 2005/07/13 21:40:46 darrenr Exp $"; #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "netinet/ip_compat.h" #ifdef USE_INET6 # include #endif #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" #include "netinet/ip_proxy.h" #include "netinet/ipf_stack.h" #ifdef IPFILTER_LOOKUP # include "netinet/ip_lookup.h" #endif #include #include #include static int frzerostats __P((caddr_t, ipf_stack_t *)); static int fr_setipfloopback __P((int, ipf_stack_t *)); static int fr_enableipf __P((ipf_stack_t *, int)); static int fr_send_ip __P((fr_info_t *fin, mblk_t *m, mblk_t **mp)); static int ipf_nic_event_v4 __P((hook_event_token_t, hook_data_t, void *)); static int ipf_nic_event_v6 __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook __P((hook_data_t, int, int, void *)); static int ipf_hook4_in __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook4_out __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook4_loop_out __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook4_loop_in __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook4 __P((hook_data_t, int, int, void *)); static int ipf_hook6_out __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook6_in __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook6_loop_out __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook6_loop_in __P((hook_event_token_t, hook_data_t, void *)); static int ipf_hook6 __P((hook_data_t, int, int, void *)); extern int ipf_geniter __P((ipftoken_t *, ipfgeniter_t *, ipf_stack_t *)); extern int ipf_frruleiter __P((void *, int, void *, ipf_stack_t *)); #if SOLARIS2 < 10 #if SOLARIS2 >= 7 u_int *ip_ttl_ptr = NULL; u_int *ip_mtudisc = NULL; # if SOLARIS2 >= 8 int *ip_forwarding = NULL; u_int *ip6_forwarding = NULL; # else u_int *ip_forwarding = NULL; # endif #else u_long *ip_ttl_ptr = NULL; u_long *ip_mtudisc = NULL; u_long *ip_forwarding = NULL; #endif #endif /* ------------------------------------------------------------------------ */ /* Function: ipldetach */ /* Returns: int - 0 == success, else error. */ /* Parameters: Nil */ /* */ /* This function is responsible for undoing anything that might have been */ /* done in a call to iplattach(). It must be able to clean up from a call */ /* to iplattach() that did not succeed. Why might that happen? Someone */ /* configures a table to be so large that we cannot allocate enough memory */ /* for it. */ /* ------------------------------------------------------------------------ */ int ipldetach(ifs) ipf_stack_t *ifs; { ASSERT(rw_read_locked(&ifs->ifs_ipf_global.ipf_lk) == 0); #if SOLARIS2 < 10 if (ifs->ifs_fr_control_forwarding & 2) { if (ip_forwarding != NULL) *ip_forwarding = 0; #if SOLARIS2 >= 8 if (ip6_forwarding != NULL) *ip6_forwarding = 0; #endif } #endif /* * This lock needs to be dropped around the net_hook_unregister calls * because we can deadlock here with: * W(ipf_global)->R(hook_family)->W(hei_lock) (this code path) vs * R(hook_family)->R(hei_lock)->R(ipf_global) (active hook running) */ RWLOCK_EXIT(&ifs->ifs_ipf_global); #define UNDO_HOOK(_f, _b, _e, _h) \ do { \ if (ifs->_f != NULL) { \ if (ifs->_b) { \ ifs->_b = (net_hook_unregister(ifs->_f, \ _e, ifs->_h) != 0); \ if (!ifs->_b) { \ hook_free(ifs->_h); \ ifs->_h = NULL; \ } \ } else if (ifs->_h != NULL) { \ hook_free(ifs->_h); \ ifs->_h = NULL; \ } \ } \ _NOTE(CONSTCOND) \ } while (0) /* * Remove IPv6 Hooks */ if (ifs->ifs_ipf_ipv6 != NULL) { UNDO_HOOK(ifs_ipf_ipv6, ifs_hook6_physical_in, NH_PHYSICAL_IN, ifs_ipfhook6_in); UNDO_HOOK(ifs_ipf_ipv6, ifs_hook6_physical_out, NH_PHYSICAL_OUT, ifs_ipfhook6_out); UNDO_HOOK(ifs_ipf_ipv6, ifs_hook6_nic_events, NH_NIC_EVENTS, ifs_ipfhook6_nicevents); UNDO_HOOK(ifs_ipf_ipv6, ifs_hook6_loopback_in, NH_LOOPBACK_IN, ifs_ipfhook6_loop_in); UNDO_HOOK(ifs_ipf_ipv6, ifs_hook6_loopback_out, NH_LOOPBACK_OUT, ifs_ipfhook6_loop_out); if (net_protocol_release(ifs->ifs_ipf_ipv6) != 0) goto detach_failed; ifs->ifs_ipf_ipv6 = NULL; } /* * Remove IPv4 Hooks */ if (ifs->ifs_ipf_ipv4 != NULL) { UNDO_HOOK(ifs_ipf_ipv4, ifs_hook4_physical_in, NH_PHYSICAL_IN, ifs_ipfhook4_in); UNDO_HOOK(ifs_ipf_ipv4, ifs_hook4_physical_out, NH_PHYSICAL_OUT, ifs_ipfhook4_out); UNDO_HOOK(ifs_ipf_ipv4, ifs_hook4_nic_events, NH_NIC_EVENTS, ifs_ipfhook4_nicevents); UNDO_HOOK(ifs_ipf_ipv4, ifs_hook4_loopback_in, NH_LOOPBACK_IN, ifs_ipfhook4_loop_in); UNDO_HOOK(ifs_ipf_ipv4, ifs_hook4_loopback_out, NH_LOOPBACK_OUT, ifs_ipfhook4_loop_out); if (net_protocol_release(ifs->ifs_ipf_ipv4) != 0) goto detach_failed; ifs->ifs_ipf_ipv4 = NULL; } #undef UNDO_HOOK #ifdef IPFDEBUG cmn_err(CE_CONT, "ipldetach()\n"); #endif WRITE_ENTER(&ifs->ifs_ipf_global); fr_deinitialise(ifs); (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE, ifs); (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE, ifs); if (ifs->ifs_ipf_locks_done == 1) { MUTEX_DESTROY(&ifs->ifs_ipf_timeoutlock); MUTEX_DESTROY(&ifs->ifs_ipf_rw); RW_DESTROY(&ifs->ifs_ipf_tokens); RW_DESTROY(&ifs->ifs_ipf_ipidfrag); ifs->ifs_ipf_locks_done = 0; } if (ifs->ifs_hook4_physical_in || ifs->ifs_hook4_physical_out || ifs->ifs_hook4_nic_events || ifs->ifs_hook4_loopback_in || ifs->ifs_hook4_loopback_out || ifs->ifs_hook6_nic_events || ifs->ifs_hook6_physical_in || ifs->ifs_hook6_physical_out || ifs->ifs_hook6_loopback_in || ifs->ifs_hook6_loopback_out) return -1; return 0; detach_failed: WRITE_ENTER(&ifs->ifs_ipf_global); return -1; } int iplattach(ifs) ipf_stack_t *ifs; { #if SOLARIS2 < 10 int i; #endif netid_t id = ifs->ifs_netid; #ifdef IPFDEBUG cmn_err(CE_CONT, "iplattach()\n"); #endif ASSERT(rw_read_locked(&ifs->ifs_ipf_global.ipf_lk) == 0); ifs->ifs_fr_flags = IPF_LOGGING; #ifdef _KERNEL ifs->ifs_fr_update_ipid = 0; #else ifs->ifs_fr_update_ipid = 1; #endif ifs->ifs_fr_minttl = 4; ifs->ifs_fr_icmpminfragmtu = 68; #if defined(IPFILTER_DEFAULT_BLOCK) ifs->ifs_fr_pass = FR_BLOCK|FR_NOMATCH; #else ifs->ifs_fr_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH; #endif bzero((char *)ifs->ifs_frcache, sizeof(ifs->ifs_frcache)); MUTEX_INIT(&ifs->ifs_ipf_rw, "ipf rw mutex"); MUTEX_INIT(&ifs->ifs_ipf_timeoutlock, "ipf timeout lock mutex"); RWLOCK_INIT(&ifs->ifs_ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); RWLOCK_INIT(&ifs->ifs_ipf_tokens, "ipf token rwlock"); ifs->ifs_ipf_locks_done = 1; if (fr_initialise(ifs) < 0) return -1; HOOK_INIT(ifs->ifs_ipfhook4_nicevents, ipf_nic_event_v4, "ipfilter_hook4_nicevents", ifs); HOOK_INIT(ifs->ifs_ipfhook4_in, ipf_hook4_in, "ipfilter_hook4_in", ifs); HOOK_INIT(ifs->ifs_ipfhook4_out, ipf_hook4_out, "ipfilter_hook4_out", ifs); HOOK_INIT(ifs->ifs_ipfhook4_loop_in, ipf_hook4_loop_in, "ipfilter_hook4_loop_in", ifs); HOOK_INIT(ifs->ifs_ipfhook4_loop_out, ipf_hook4_loop_out, "ipfilter_hook4_loop_out", ifs); /* * If we hold this lock over all of the net_hook_register calls, we * can cause a deadlock to occur with the following lock ordering: * W(ipf_global)->R(hook_family)->W(hei_lock) (this code path) vs * R(hook_family)->R(hei_lock)->R(ipf_global) (packet path) */ RWLOCK_EXIT(&ifs->ifs_ipf_global); /* * Add IPv4 hooks */ ifs->ifs_ipf_ipv4 = net_protocol_lookup(id, NHF_INET); if (ifs->ifs_ipf_ipv4 == NULL) goto hookup_failed; ifs->ifs_hook4_nic_events = (net_hook_register(ifs->ifs_ipf_ipv4, NH_NIC_EVENTS, ifs->ifs_ipfhook4_nicevents) == 0); if (!ifs->ifs_hook4_nic_events) goto hookup_failed; ifs->ifs_hook4_physical_in = (net_hook_register(ifs->ifs_ipf_ipv4, NH_PHYSICAL_IN, ifs->ifs_ipfhook4_in) == 0); if (!ifs->ifs_hook4_physical_in) goto hookup_failed; ifs->ifs_hook4_physical_out = (net_hook_register(ifs->ifs_ipf_ipv4, NH_PHYSICAL_OUT, ifs->ifs_ipfhook4_out) == 0); if (!ifs->ifs_hook4_physical_out) goto hookup_failed; if (ifs->ifs_ipf_loopback) { ifs->ifs_hook4_loopback_in = (net_hook_register( ifs->ifs_ipf_ipv4, NH_LOOPBACK_IN, ifs->ifs_ipfhook4_loop_in) == 0); if (!ifs->ifs_hook4_loopback_in) goto hookup_failed; ifs->ifs_hook4_loopback_out = (net_hook_register( ifs->ifs_ipf_ipv4, NH_LOOPBACK_OUT, ifs->ifs_ipfhook4_loop_out) == 0); if (!ifs->ifs_hook4_loopback_out) goto hookup_failed; } /* * Add IPv6 hooks */ ifs->ifs_ipf_ipv6 = net_protocol_lookup(id, NHF_INET6); if (ifs->ifs_ipf_ipv6 == NULL) goto hookup_failed; HOOK_INIT(ifs->ifs_ipfhook6_nicevents, ipf_nic_event_v6, "ipfilter_hook6_nicevents", ifs); HOOK_INIT(ifs->ifs_ipfhook6_in, ipf_hook6_in, "ipfilter_hook6_in", ifs); HOOK_INIT(ifs->ifs_ipfhook6_out, ipf_hook6_out, "ipfilter_hook6_out", ifs); HOOK_INIT(ifs->ifs_ipfhook6_loop_in, ipf_hook6_loop_in, "ipfilter_hook6_loop_in", ifs); HOOK_INIT(ifs->ifs_ipfhook6_loop_out, ipf_hook6_loop_out, "ipfilter_hook6_loop_out", ifs); ifs->ifs_hook6_nic_events = (net_hook_register(ifs->ifs_ipf_ipv6, NH_NIC_EVENTS, ifs->ifs_ipfhook6_nicevents) == 0); if (!ifs->ifs_hook6_nic_events) goto hookup_failed; ifs->ifs_hook6_physical_in = (net_hook_register(ifs->ifs_ipf_ipv6, NH_PHYSICAL_IN, ifs->ifs_ipfhook6_in) == 0); if (!ifs->ifs_hook6_physical_in) goto hookup_failed; ifs->ifs_hook6_physical_out = (net_hook_register(ifs->ifs_ipf_ipv6, NH_PHYSICAL_OUT, ifs->ifs_ipfhook6_out) == 0); if (!ifs->ifs_hook6_physical_out) goto hookup_failed; if (ifs->ifs_ipf_loopback) { ifs->ifs_hook6_loopback_in = (net_hook_register( ifs->ifs_ipf_ipv6, NH_LOOPBACK_IN, ifs->ifs_ipfhook6_loop_in) == 0); if (!ifs->ifs_hook6_loopback_in) goto hookup_failed; ifs->ifs_hook6_loopback_out = (net_hook_register( ifs->ifs_ipf_ipv6, NH_LOOPBACK_OUT, ifs->ifs_ipfhook6_loop_out) == 0); if (!ifs->ifs_hook6_loopback_out) goto hookup_failed; } /* * Reacquire ipf_global, now it is safe. */ WRITE_ENTER(&ifs->ifs_ipf_global); /* Do not use private interface ip_params_arr[] in Solaris 10 */ #if SOLARIS2 < 10 #if SOLARIS2 >= 8 ip_forwarding = &ip_g_forward; #endif /* * XXX - There is no terminator for this array, so it is not possible * to tell if what we are looking for is missing and go off the end * of the array. */ #if SOLARIS2 <= 8 for (i = 0; ; i++) { if (!strcmp(ip_param_arr[i].ip_param_name, "ip_def_ttl")) { ip_ttl_ptr = &ip_param_arr[i].ip_param_value; } else if (!strcmp(ip_param_arr[i].ip_param_name, "ip_path_mtu_discovery")) { ip_mtudisc = &ip_param_arr[i].ip_param_value; } #if SOLARIS2 < 8 else if (!strcmp(ip_param_arr[i].ip_param_name, "ip_forwarding")) { ip_forwarding = &ip_param_arr[i].ip_param_value; } #else else if (!strcmp(ip_param_arr[i].ip_param_name, "ip6_forwarding")) { ip6_forwarding = &ip_param_arr[i].ip_param_value; } #endif if (ip_mtudisc != NULL && ip_ttl_ptr != NULL && #if SOLARIS2 >= 8 ip6_forwarding != NULL && #endif ip_forwarding != NULL) break; } #endif if (ifs->ifs_fr_control_forwarding & 1) { if (ip_forwarding != NULL) *ip_forwarding = 1; #if SOLARIS2 >= 8 if (ip6_forwarding != NULL) *ip6_forwarding = 1; #endif } #endif return 0; hookup_failed: WRITE_ENTER(&ifs->ifs_ipf_global); return -1; } static int fr_setipfloopback(set, ifs) int set; ipf_stack_t *ifs; { if (ifs->ifs_ipf_ipv4 == NULL || ifs->ifs_ipf_ipv6 == NULL) return EFAULT; if (set && !ifs->ifs_ipf_loopback) { ifs->ifs_ipf_loopback = 1; ifs->ifs_hook4_loopback_in = (net_hook_register( ifs->ifs_ipf_ipv4, NH_LOOPBACK_IN, ifs->ifs_ipfhook4_loop_in) == 0); if (!ifs->ifs_hook4_loopback_in) return EINVAL; ifs->ifs_hook4_loopback_out = (net_hook_register( ifs->ifs_ipf_ipv4, NH_LOOPBACK_OUT, ifs->ifs_ipfhook4_loop_out) == 0); if (!ifs->ifs_hook4_loopback_out) return EINVAL; ifs->ifs_hook6_loopback_in = (net_hook_register( ifs->ifs_ipf_ipv6, NH_LOOPBACK_IN, ifs->ifs_ipfhook6_loop_in) == 0); if (!ifs->ifs_hook6_loopback_in) return EINVAL; ifs->ifs_hook6_loopback_out = (net_hook_register( ifs->ifs_ipf_ipv6, NH_LOOPBACK_OUT, ifs->ifs_ipfhook6_loop_out) == 0); if (!ifs->ifs_hook6_loopback_out) return EINVAL; } else if (!set && ifs->ifs_ipf_loopback) { ifs->ifs_ipf_loopback = 0; ifs->ifs_hook4_loopback_in = (net_hook_unregister(ifs->ifs_ipf_ipv4, NH_LOOPBACK_IN, ifs->ifs_ipfhook4_loop_in) != 0); if (ifs->ifs_hook4_loopback_in) return EBUSY; ifs->ifs_hook4_loopback_out = (net_hook_unregister(ifs->ifs_ipf_ipv4, NH_LOOPBACK_OUT, ifs->ifs_ipfhook4_loop_out) != 0); if (ifs->ifs_hook4_loopback_out) return EBUSY; ifs->ifs_hook6_loopback_in = (net_hook_unregister(ifs->ifs_ipf_ipv6, NH_LOOPBACK_IN, ifs->ifs_ipfhook4_loop_in) != 0); if (ifs->ifs_hook6_loopback_in) return EBUSY; ifs->ifs_hook6_loopback_out = (net_hook_unregister(ifs->ifs_ipf_ipv6, NH_LOOPBACK_OUT, ifs->ifs_ipfhook6_loop_out) != 0); if (ifs->ifs_hook6_loopback_out) return EBUSY; } return 0; } /* * Filter ioctl interface. */ /*ARGSUSED*/ int iplioctl(dev, cmd, data, mode, cp, rp) dev_t dev; int cmd; #if SOLARIS2 >= 7 intptr_t data; #else int *data; #endif int mode; cred_t *cp; int *rp; { int error = 0, tmp; friostat_t fio; minor_t unit; u_int enable; ipf_stack_t *ifs; #ifdef IPFDEBUG cmn_err(CE_CONT, "iplioctl(%x,%x,%x,%d,%x,%d)\n", dev, cmd, data, mode, cp, rp); #endif unit = getminor(dev); if (IPL_LOGMAX < unit) return ENXIO; /* * As we're calling ipf_find_stack in user space, from a given zone * to find the stack pointer for this zone, there is no need to have * a hold/refence count here. */ ifs = ipf_find_stack(crgetzoneid(cp)); ASSERT(ifs != NULL); if (ifs->ifs_fr_running <= 0) { if (unit != IPL_LOGIPF) { return EIO; } if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && cmd != SIOCIPFSET && cmd != SIOCFRENB && cmd != SIOCGETFS && cmd != SIOCGETFF) { return EIO; } } READ_ENTER(&ifs->ifs_ipf_global); if (ifs->ifs_fr_enable_active != 0) { RWLOCK_EXIT(&ifs->ifs_ipf_global); return EBUSY; } error = fr_ioctlswitch(unit, (caddr_t)data, cmd, mode, crgetuid(cp), curproc, ifs); if (error != -1) { RWLOCK_EXIT(&ifs->ifs_ipf_global); return error; } error = 0; switch (cmd) { case SIOCFRENB : if (!(mode & FWRITE)) error = EPERM; else { error = COPYIN((caddr_t)data, (caddr_t)&enable, sizeof(enable)); if (error != 0) { error = EFAULT; break; } RWLOCK_EXIT(&ifs->ifs_ipf_global); WRITE_ENTER(&ifs->ifs_ipf_global); /* * We must recheck fr_enable_active here, since we've * dropped ifs_ipf_global from R in order to get it * exclusively. */ if (ifs->ifs_fr_enable_active == 0) { ifs->ifs_fr_enable_active = 1; error = fr_enableipf(ifs, enable); ifs->ifs_fr_enable_active = 0; } } break; case SIOCIPFSET : if (!(mode & FWRITE)) { error = EPERM; break; } /* FALLTHRU */ case SIOCIPFGETNEXT : case SIOCIPFGET : error = fr_ipftune(cmd, (void *)data, ifs); break; case SIOCSETFF : if (!(mode & FWRITE)) error = EPERM; else { error = COPYIN((caddr_t)data, (caddr_t)&ifs->ifs_fr_flags, sizeof(ifs->ifs_fr_flags)); if (error != 0) error = EFAULT; } break; case SIOCIPFLP : error = COPYIN((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (error != 0) error = EFAULT; else error = fr_setipfloopback(tmp, ifs); break; case SIOCGETFF : error = COPYOUT((caddr_t)&ifs->ifs_fr_flags, (caddr_t)data, sizeof(ifs->ifs_fr_flags)); if (error != 0) error = EFAULT; break; case SIOCFUNCL : error = fr_resolvefunc((void *)data); break; case SIOCINAFR : case SIOCRMAFR : case SIOCADAFR : case SIOCZRLST : if (!(mode & FWRITE)) error = EPERM; else error = frrequest(unit, cmd, (caddr_t)data, ifs->ifs_fr_active, 1, ifs); break; case SIOCINIFR : case SIOCRMIFR : case SIOCADIFR : if (!(mode & FWRITE)) error = EPERM; else error = frrequest(unit, cmd, (caddr_t)data, 1 - ifs->ifs_fr_active, 1, ifs); break; case SIOCSWAPA : if (!(mode & FWRITE)) error = EPERM; else { WRITE_ENTER(&ifs->ifs_ipf_mutex); bzero((char *)ifs->ifs_frcache, sizeof (ifs->ifs_frcache)); error = COPYOUT((caddr_t)&ifs->ifs_fr_active, (caddr_t)data, sizeof(ifs->ifs_fr_active)); if (error != 0) error = EFAULT; else ifs->ifs_fr_active = 1 - ifs->ifs_fr_active; RWLOCK_EXIT(&ifs->ifs_ipf_mutex); } break; case SIOCGETFS : fr_getstat(&fio, ifs); error = fr_outobj((void *)data, &fio, IPFOBJ_IPFSTAT); break; case SIOCFRZST : if (!(mode & FWRITE)) error = EPERM; else error = fr_zerostats((caddr_t)data, ifs); break; case SIOCIPFFL : if (!(mode & FWRITE)) error = EPERM; else { error = COPYIN((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (!error) { tmp = frflush(unit, 4, tmp, ifs); error = COPYOUT((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error != 0) error = EFAULT; } else error = EFAULT; } break; #ifdef USE_INET6 case SIOCIPFL6 : if (!(mode & FWRITE)) error = EPERM; else { error = COPYIN((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (!error) { tmp = frflush(unit, 6, tmp, ifs); error = COPYOUT((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error != 0) error = EFAULT; } else error = EFAULT; } break; #endif case SIOCSTLCK : error = COPYIN((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (error == 0) { ifs->ifs_fr_state_lock = tmp; ifs->ifs_fr_nat_lock = tmp; ifs->ifs_fr_frag_lock = tmp; ifs->ifs_fr_auth_lock = tmp; } else error = EFAULT; break; #ifdef IPFILTER_LOG case SIOCIPFFB : if (!(mode & FWRITE)) error = EPERM; else { tmp = ipflog_clear(unit, ifs); error = COPYOUT((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error) error = EFAULT; } break; #endif /* IPFILTER_LOG */ case SIOCFRSYN : if (!(mode & FWRITE)) error = EPERM; else { RWLOCK_EXIT(&ifs->ifs_ipf_global); WRITE_ENTER(&ifs->ifs_ipf_global); frsync(IPFSYNC_RESYNC, 0, NULL, NULL, ifs); fr_natifpsync(IPFSYNC_RESYNC, 0, NULL, NULL, ifs); fr_nataddrsync(0, NULL, NULL, ifs); fr_statesync(IPFSYNC_RESYNC, 0, NULL, NULL, ifs); error = 0; } break; case SIOCGFRST : error = fr_outobj((void *)data, fr_fragstats(ifs), IPFOBJ_FRAGSTAT); break; case FIONREAD : #ifdef IPFILTER_LOG tmp = (int)ifs->ifs_iplused[IPL_LOGIPF]; error = COPYOUT((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error != 0) error = EFAULT; #endif break; case SIOCIPFITER : error = ipf_frruleiter((caddr_t)data, crgetuid(cp), curproc, ifs); break; case SIOCGENITER : error = ipf_genericiter((caddr_t)data, crgetuid(cp), curproc, ifs); break; case SIOCIPFDELTOK : error = BCOPYIN((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (error != 0) { error = EFAULT; } else { error = ipf_deltoken(tmp, crgetuid(cp), curproc, ifs); } break; default : #ifdef IPFDEBUG cmn_err(CE_NOTE, "Unknown: cmd 0x%x data %p", cmd, (void *)data); #endif error = EINVAL; break; } RWLOCK_EXIT(&ifs->ifs_ipf_global); return error; } static int fr_enableipf(ifs, enable) ipf_stack_t *ifs; int enable; { int error; if (!enable) { error = ipldetach(ifs); if (error == 0) ifs->ifs_fr_running = -1; return error; } if (ifs->ifs_fr_running > 0) return 0; error = iplattach(ifs); if (error == 0) { if (ifs->ifs_fr_timer_id == NULL) { int hz = drv_usectohz(500000); ifs->ifs_fr_timer_id = timeout(fr_slowtimer, (void *)ifs, hz); } ifs->ifs_fr_running = 1; } else { (void) ipldetach(ifs); } return error; } phy_if_t get_unit(name, v, ifs) char *name; int v; ipf_stack_t *ifs; { net_handle_t nif; if (v == 4) nif = ifs->ifs_ipf_ipv4; else if (v == 6) nif = ifs->ifs_ipf_ipv6; else return 0; return (net_phylookup(nif, name)); } /* * routines below for saving IP headers to buffer */ /*ARGSUSED*/ int iplopen(devp, flags, otype, cred) dev_t *devp; int flags, otype; cred_t *cred; { minor_t min = getminor(*devp); #ifdef IPFDEBUG cmn_err(CE_CONT, "iplopen(%x,%x,%x,%x)\n", devp, flags, otype, cred); #endif if (!(otype & OTYP_CHR)) return ENXIO; min = (IPL_LOGMAX < min) ? ENXIO : 0; return min; } /*ARGSUSED*/ int iplclose(dev, flags, otype, cred) dev_t dev; int flags, otype; cred_t *cred; { minor_t min = getminor(dev); #ifdef IPFDEBUG cmn_err(CE_CONT, "iplclose(%x,%x,%x,%x)\n", dev, flags, otype, cred); #endif min = (IPL_LOGMAX < min) ? ENXIO : 0; return min; } #ifdef IPFILTER_LOG /* * iplread/ipllog * both of these must operate with at least splnet() lest they be * called during packet processing and cause an inconsistancy to appear in * the filter lists. */ /*ARGSUSED*/ int iplread(dev, uio, cp) dev_t dev; register struct uio *uio; cred_t *cp; { ipf_stack_t *ifs; int ret; /* * As we're calling ipf_find_stack in user space, from a given zone * to find the stack pointer for this zone, there is no need to have * a hold/refence count here. */ ifs = ipf_find_stack(crgetzoneid(cp)); ASSERT(ifs != NULL); # ifdef IPFDEBUG cmn_err(CE_CONT, "iplread(%x,%x,%x)\n", dev, uio, cp); # endif if (ifs->ifs_fr_running < 1) { return EIO; } # ifdef IPFILTER_SYNC if (getminor(dev) == IPL_LOGSYNC) { return ipfsync_read(uio); } # endif ret = ipflog_read(getminor(dev), uio, ifs); return ret; } #endif /* IPFILTER_LOG */ /* * iplread/ipllog * both of these must operate with at least splnet() lest they be * called during packet processing and cause an inconsistancy to appear in * the filter lists. */ int iplwrite(dev, uio, cp) dev_t dev; register struct uio *uio; cred_t *cp; { ipf_stack_t *ifs; /* * As we're calling ipf_find_stack in user space, from a given zone * to find the stack pointer for this zone, there is no need to have * a hold/refence count here. */ ifs = ipf_find_stack(crgetzoneid(cp)); ASSERT(ifs != NULL); #ifdef IPFDEBUG cmn_err(CE_CONT, "iplwrite(%x,%x,%x)\n", dev, uio, cp); #endif if (ifs->ifs_fr_running < 1) { return EIO; } #ifdef IPFILTER_SYNC if (getminor(dev) == IPL_LOGSYNC) return ipfsync_write(uio); #endif /* IPFILTER_SYNC */ dev = dev; /* LINT */ uio = uio; /* LINT */ cp = cp; /* LINT */ return ENXIO; } /* * fr_send_reset - this could conceivably be a call to tcp_respond(), but that * requires a large amount of setting up and isn't any more efficient. */ int fr_send_reset(fin) fr_info_t *fin; { tcphdr_t *tcp, *tcp2; int tlen, hlen; mblk_t *m; #ifdef USE_INET6 ip6_t *ip6; #endif ip_t *ip; tcp = fin->fin_dp; if (tcp->th_flags & TH_RST) return -1; #ifndef IPFILTER_CKSUM if (fr_checkl4sum(fin) == -1) return -1; #endif tlen = (tcp->th_flags & (TH_SYN|TH_FIN)) ? 1 : 0; #ifdef USE_INET6 if (fin->fin_v == 6) hlen = sizeof(ip6_t); else #endif hlen = sizeof(ip_t); hlen += sizeof(*tcp2); if ((m = (mblk_t *)allocb(hlen + 64, BPRI_HI)) == NULL) return -1; m->b_rptr += 64; MTYPE(m) = M_DATA; m->b_wptr = m->b_rptr + hlen; ip = (ip_t *)m->b_rptr; bzero((char *)ip, hlen); tcp2 = (struct tcphdr *)(m->b_rptr + hlen - sizeof(*tcp2)); tcp2->th_dport = tcp->th_sport; tcp2->th_sport = tcp->th_dport; if (tcp->th_flags & TH_ACK) { tcp2->th_seq = tcp->th_ack; tcp2->th_flags = TH_RST; } else { tcp2->th_ack = ntohl(tcp->th_seq); tcp2->th_ack += tlen; tcp2->th_ack = htonl(tcp2->th_ack); tcp2->th_flags = TH_RST|TH_ACK; } tcp2->th_off = sizeof(struct tcphdr) >> 2; ip->ip_v = fin->fin_v; #ifdef USE_INET6 if (fin->fin_v == 6) { ip6 = (ip6_t *)m->b_rptr; ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; ip6->ip6_src = fin->fin_dst6.in6; ip6->ip6_dst = fin->fin_src6.in6; ip6->ip6_plen = htons(sizeof(*tcp)); ip6->ip6_nxt = IPPROTO_TCP; tcp2->th_sum = fr_cksum(m, (ip_t *)ip6, IPPROTO_TCP, tcp2); } else #endif { ip->ip_src.s_addr = fin->fin_daddr; ip->ip_dst.s_addr = fin->fin_saddr; ip->ip_id = fr_nextipid(fin); ip->ip_hl = sizeof(*ip) >> 2; ip->ip_p = IPPROTO_TCP; ip->ip_len = sizeof(*ip) + sizeof(*tcp); ip->ip_tos = fin->fin_ip->ip_tos; tcp2->th_sum = fr_cksum(m, ip, IPPROTO_TCP, tcp2); } return fr_send_ip(fin, m, &m); } /* * Function: fr_send_ip * Returns: 0: success * -1: failed * Parameters: * fin: packet information * m: the message block where ip head starts * * Send a new packet through the IP stack. * * For IPv4 packets, ip_len must be in host byte order, and ip_v, * ip_ttl, ip_off, and ip_sum are ignored (filled in by this * function). * * For IPv6 packets, ip6_flow, ip6_vfc, and ip6_hlim are filled * in by this function. * * All other portions of the packet must be in on-the-wire format. */ /*ARGSUSED*/ static int fr_send_ip(fin, m, mpp) fr_info_t *fin; mblk_t *m, **mpp; { qpktinfo_t qpi, *qpip; fr_info_t fnew; ip_t *ip; int i, hlen; ipf_stack_t *ifs = fin->fin_ifs; ip = (ip_t *)m->b_rptr; bzero((char *)&fnew, sizeof(fnew)); #ifdef USE_INET6 if (fin->fin_v == 6) { ip6_t *ip6; ip6 = (ip6_t *)ip; ip6->ip6_vfc = 0x60; ip6->ip6_hlim = 127; fnew.fin_v = 6; hlen = sizeof(*ip6); fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; } else #endif { fnew.fin_v = 4; #if SOLARIS2 >= 10 ip->ip_ttl = 255; if (net_getpmtuenabled(ifs->ifs_ipf_ipv4) == 1) ip->ip_off = htons(IP_DF); #else if (ip_ttl_ptr != NULL) ip->ip_ttl = (u_char)(*ip_ttl_ptr); else ip->ip_ttl = 63; if (ip_mtudisc != NULL) ip->ip_off = htons(*ip_mtudisc ? IP_DF : 0); else ip->ip_off = htons(IP_DF); #endif /* * The dance with byte order and ip_len/ip_off is because in * fr_fastroute, it expects them to be in host byte order but * ipf_cksum expects them to be in network byte order. */ ip->ip_len = htons(ip->ip_len); ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip)); ip->ip_len = ntohs(ip->ip_len); ip->ip_off = ntohs(ip->ip_off); hlen = sizeof(*ip); fnew.fin_plen = ip->ip_len; } qpip = fin->fin_qpi; qpi.qpi_off = 0; qpi.qpi_ill = qpip->qpi_ill; qpi.qpi_m = m; qpi.qpi_data = ip; fnew.fin_qpi = &qpi; fnew.fin_ifp = fin->fin_ifp; fnew.fin_flx = FI_NOCKSUM; fnew.fin_m = m; fnew.fin_qfm = m; fnew.fin_ip = ip; fnew.fin_mp = mpp; fnew.fin_hlen = hlen; fnew.fin_dp = (char *)ip + hlen; fnew.fin_ifs = fin->fin_ifs; (void) fr_makefrip(hlen, ip, &fnew); i = fr_fastroute(m, mpp, &fnew, NULL); return i; } int fr_send_icmp_err(type, fin, dst) int type; fr_info_t *fin; int dst; { struct in_addr dst4; struct icmp *icmp; qpktinfo_t *qpi; int hlen, code; phy_if_t phy; u_short sz; #ifdef USE_INET6 mblk_t *mb; #endif mblk_t *m; #ifdef USE_INET6 ip6_t *ip6; #endif ip_t *ip; ipf_stack_t *ifs = fin->fin_ifs; if ((type < 0) || (type > ICMP_MAXTYPE)) return -1; code = fin->fin_icode; #ifdef USE_INET6 if ((code < 0) || (code >= ICMP_MAX_UNREACH)) return -1; #endif #ifndef IPFILTER_CKSUM if (fr_checkl4sum(fin) == -1) return -1; #endif qpi = fin->fin_qpi; #ifdef USE_INET6 mb = fin->fin_qfm; if (fin->fin_v == 6) { sz = sizeof(ip6_t); sz += MIN(mb->b_wptr - mb->b_rptr, 512); hlen = sizeof(ip6_t); type = icmptoicmp6types[type]; if (type == ICMP6_DST_UNREACH) code = icmptoicmp6unreach[code]; } else #endif { if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) switch (ntohs(fin->fin_data[0]) >> 8) { case ICMP_ECHO : case ICMP_TSTAMP : case ICMP_IREQ : case ICMP_MASKREQ : break; default : return 0; } sz = sizeof(ip_t) * 2; sz += 8; /* 64 bits of data */ hlen = sizeof(ip_t); } sz += offsetof(struct icmp, icmp_ip); if ((m = (mblk_t *)allocb((size_t)sz + 64, BPRI_HI)) == NULL) return -1; MTYPE(m) = M_DATA; m->b_rptr += 64; m->b_wptr = m->b_rptr + sz; bzero((char *)m->b_rptr, (size_t)sz); ip = (ip_t *)m->b_rptr; ip->ip_v = fin->fin_v; icmp = (struct icmp *)(m->b_rptr + hlen); icmp->icmp_type = type & 0xff; icmp->icmp_code = code & 0xff; phy = (phy_if_t)qpi->qpi_ill; if (type == ICMP_UNREACH && (phy != 0) && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) icmp->icmp_nextmtu = net_getmtu(ifs->ifs_ipf_ipv4, phy,0 ); #ifdef USE_INET6 if (fin->fin_v == 6) { struct in6_addr dst6; int csz; if (dst == 0) { ipf_stack_t *ifs = fin->fin_ifs; if (fr_ifpaddr(6, FRI_NORMAL, (void *)phy, (void *)&dst6, NULL, ifs) == -1) { FREE_MB_T(m); return -1; } } else dst6 = fin->fin_dst6.in6; csz = sz; sz -= sizeof(ip6_t); ip6 = (ip6_t *)m->b_rptr; ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; ip6->ip6_plen = htons((u_short)sz); ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_src = dst6; ip6->ip6_dst = fin->fin_src6.in6; sz -= offsetof(struct icmp, icmp_ip); bcopy((char *)mb->b_rptr, (char *)&icmp->icmp_ip, sz); icmp->icmp_cksum = csz - sizeof(ip6_t); } else #endif { ip->ip_hl = sizeof(*ip) >> 2; ip->ip_p = IPPROTO_ICMP; ip->ip_id = fin->fin_ip->ip_id; ip->ip_tos = fin->fin_ip->ip_tos; ip->ip_len = (u_short)sz; if (dst == 0) { ipf_stack_t *ifs = fin->fin_ifs; if (fr_ifpaddr(4, FRI_NORMAL, (void *)phy, (void *)&dst4, NULL, ifs) == -1) { FREE_MB_T(m); return -1; } } else { dst4 = fin->fin_dst; } ip->ip_src = dst4; ip->ip_dst = fin->fin_src; bcopy((char *)fin->fin_ip, (char *)&icmp->icmp_ip, sizeof(*fin->fin_ip)); bcopy((char *)fin->fin_ip + fin->fin_hlen, (char *)&icmp->icmp_ip + sizeof(*fin->fin_ip), 8); icmp->icmp_ip.ip_len = htons(icmp->icmp_ip.ip_len); icmp->icmp_ip.ip_off = htons(icmp->icmp_ip.ip_off); icmp->icmp_cksum = ipf_cksum((u_short *)icmp, sz - sizeof(ip_t)); } /* * Need to exit out of these so we don't recursively call rw_enter * from fr_qout. */ return fr_send_ip(fin, m, &m); } #include #include #ifndef _KERNEL #include #endif #define NULLADDR_RATE_LIMIT 10 /* 10 seconds */ /* * Print out warning message at rate-limited speed. */ static void rate_limit_message(ipf_stack_t *ifs, int rate, const char *message, ...) { static time_t last_time = 0; time_t now; va_list args; char msg_buf[256]; int need_printed = 0; now = ddi_get_time(); /* make sure, no multiple entries */ ASSERT(MUTEX_NOT_HELD(&(ifs->ifs_ipf_rw.ipf_lk))); MUTEX_ENTER(&ifs->ifs_ipf_rw); if (now - last_time >= rate) { need_printed = 1; last_time = now; } MUTEX_EXIT(&ifs->ifs_ipf_rw); if (need_printed) { va_start(args, message); (void)vsnprintf(msg_buf, 255, message, args); va_end(args); #ifdef _KERNEL cmn_err(CE_WARN, msg_buf); #else fprintf(std_err, msg_buf); #endif } } /* * Return the first IP Address associated with an interface * For IPv6, we walk through the list of logical interfaces and return * the address of the first one that isn't a link-local interface. * We can't assume that it is :1 because another link-local address * may have been assigned there. */ /*ARGSUSED*/ int fr_ifpaddr(v, atype, ifptr, inp, inpmask, ifs) int v, atype; void *ifptr; struct in_addr *inp, *inpmask; ipf_stack_t *ifs; { struct sockaddr_in6 v6addr[2]; struct sockaddr_in v4addr[2]; net_ifaddr_t type[2]; net_handle_t net_data; phy_if_t phyif; void *array; switch (v) { case 4: net_data = ifs->ifs_ipf_ipv4; array = v4addr; break; case 6: net_data = ifs->ifs_ipf_ipv6; array = v6addr; break; default: net_data = NULL; break; } if (net_data == NULL) return -1; phyif = (phy_if_t)ifptr; switch (atype) { case FRI_PEERADDR : type[0] = NA_PEER; break; case FRI_BROADCAST : type[0] = NA_BROADCAST; break; default : type[0] = NA_ADDRESS; break; } type[1] = NA_NETMASK; if (v == 6) { lif_if_t idx = 0; do { idx = net_lifgetnext(net_data, phyif, idx); if (net_getlifaddr(net_data, phyif, idx, 2, type, array) < 0) return -1; if (!IN6_IS_ADDR_LINKLOCAL(&v6addr[0].sin6_addr) && !IN6_IS_ADDR_MULTICAST(&v6addr[0].sin6_addr)) break; } while (idx != 0); if (idx == 0) return -1; return fr_ifpfillv6addr(atype, &v6addr[0], &v6addr[1], inp, inpmask); } if (net_getlifaddr(net_data, phyif, 0, 2, type, array) < 0) return -1; return fr_ifpfillv4addr(atype, &v4addr[0], &v4addr[1], inp, inpmask); } u_32_t fr_newisn(fin) fr_info_t *fin; { static int iss_seq_off = 0; u_char hash[16]; u_32_t newiss; MD5_CTX ctx; ipf_stack_t *ifs = fin->fin_ifs; /* * Compute the base value of the ISS. It is a hash * of (saddr, sport, daddr, dport, secret). */ MD5Init(&ctx); MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, sizeof(fin->fin_fi.fi_src)); MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, sizeof(fin->fin_fi.fi_dst)); MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); MD5Update(&ctx, ifs->ifs_ipf_iss_secret, sizeof(ifs->ifs_ipf_iss_secret)); MD5Final(hash, &ctx); bcopy(hash, &newiss, sizeof(newiss)); /* * Now increment our "timer", and add it in to * the computed value. * * XXX Use `addin'? * XXX TCP_ISSINCR too large to use? */ iss_seq_off += 0x00010000; newiss += iss_seq_off; return newiss; } /* ------------------------------------------------------------------------ */ /* Function: fr_nextipid */ /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ /* Parameters: fin(I) - pointer to packet information */ /* */ /* Returns the next IPv4 ID to use for this packet. */ /* ------------------------------------------------------------------------ */ u_short fr_nextipid(fin) fr_info_t *fin; { static u_short ipid = 0; u_short id; ipf_stack_t *ifs = fin->fin_ifs; MUTEX_ENTER(&ifs->ifs_ipf_rw); if (fin->fin_pktnum != 0) { id = fin->fin_pktnum & 0xffff; } else { id = ipid++; } MUTEX_EXIT(&ifs->ifs_ipf_rw); return id; } #ifndef IPFILTER_CKSUM /* ARGSUSED */ #endif INLINE void fr_checkv4sum(fin) fr_info_t *fin; { #ifdef IPFILTER_CKSUM if (fr_checkl4sum(fin) == -1) fin->fin_flx |= FI_BAD; #endif } #ifdef USE_INET6 # ifndef IPFILTER_CKSUM /* ARGSUSED */ # endif INLINE void fr_checkv6sum(fin) fr_info_t *fin; { # ifdef IPFILTER_CKSUM if (fr_checkl4sum(fin) == -1) fin->fin_flx |= FI_BAD; # endif } #endif /* USE_INET6 */ #if (SOLARIS2 < 7) void fr_slowtimer() #else /*ARGSUSED*/ void fr_slowtimer __P((void *arg)) #endif { ipf_stack_t *ifs = arg; READ_ENTER(&ifs->ifs_ipf_global); if (ifs->ifs_fr_running != 1) { ifs->ifs_fr_timer_id = NULL; RWLOCK_EXIT(&ifs->ifs_ipf_global); return; } ipf_expiretokens(ifs); fr_fragexpire(ifs); fr_timeoutstate(ifs); fr_natexpire(ifs); fr_authexpire(ifs); ifs->ifs_fr_ticks++; if (ifs->ifs_fr_running == 1) ifs->ifs_fr_timer_id = timeout(fr_slowtimer, arg, drv_usectohz(500000)); else ifs->ifs_fr_timer_id = NULL; RWLOCK_EXIT(&ifs->ifs_ipf_global); } /* ------------------------------------------------------------------------ */ /* Function: fr_pullup */ /* Returns: NULL == pullup failed, else pointer to protocol header */ /* Parameters: m(I) - pointer to buffer where data packet starts */ /* fin(I) - pointer to packet information */ /* len(I) - number of bytes to pullup */ /* */ /* Attempt to move at least len bytes (from the start of the buffer) into a */ /* single buffer for ease of access. Operating system native functions are */ /* used to manage buffers - if necessary. If the entire packet ends up in */ /* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ /* and ONLY if the pullup succeeds. */ /* */ /* We assume that 'min' is a pointer to a buffer that is part of the chain */ /* of buffers that starts at *fin->fin_mp. */ /* ------------------------------------------------------------------------ */ void *fr_pullup(min, fin, len) mb_t *min; fr_info_t *fin; int len; { qpktinfo_t *qpi = fin->fin_qpi; int out = fin->fin_out, dpoff, ipoff; mb_t *m = min, *m1, *m2; char *ip; uint32_t start, stuff, end, value, flags; ipf_stack_t *ifs = fin->fin_ifs; if (m == NULL) return NULL; ip = (char *)fin->fin_ip; if ((fin->fin_flx & FI_COALESCE) != 0) return ip; ipoff = fin->fin_ipoff; if (fin->fin_dp != NULL) dpoff = (char *)fin->fin_dp - (char *)ip; else dpoff = 0; if (M_LEN(m) < len + ipoff) { /* * pfil_precheck ensures the IP header is on a 32bit * aligned address so simply fail if that isn't currently * the case (should never happen). */ int inc = 0; if (ipoff > 0) { if ((ipoff & 3) != 0) { inc = 4 - (ipoff & 3); if (m->b_rptr - inc >= m->b_datap->db_base) m->b_rptr -= inc; else inc = 0; } } /* * XXX This is here as a work around for a bug with DEBUG * XXX Solaris kernels. The problem is b_prev is used by IP * XXX code as a way to stash the phyint_index for a packet, * XXX this doesn't get reset by IP but freeb does an ASSERT() * XXX for both of these to be NULL. See 6442390. */ m1 = m; m2 = m->b_prev; do { m1->b_next = NULL; m1->b_prev = NULL; m1 = m1->b_cont; } while (m1); /* * Need to preserve checksum information by copying them * to newmp which heads the pulluped message. */ hcksum_retrieve(m, NULL, NULL, &start, &stuff, &end, &value, &flags); if (pullupmsg(m, len + ipoff + inc) == 0) { ATOMIC_INCL(ifs->ifs_frstats[out].fr_pull[1]); FREE_MB_T(*fin->fin_mp); *fin->fin_mp = NULL; fin->fin_m = NULL; fin->fin_ip = NULL; fin->fin_dp = NULL; qpi->qpi_data = NULL; return NULL; } (void) hcksum_assoc(m, NULL, NULL, start, stuff, end, value, flags, 0); m->b_prev = m2; m->b_rptr += inc; fin->fin_m = m; ip = MTOD(m, char *) + ipoff; qpi->qpi_data = ip; } ATOMIC_INCL(ifs->ifs_frstats[out].fr_pull[0]); fin->fin_ip = (ip_t *)ip; if (fin->fin_dp != NULL) fin->fin_dp = (char *)fin->fin_ip + dpoff; if (len == fin->fin_plen) fin->fin_flx |= FI_COALESCE; return ip; } /* * Function: fr_verifysrc * Returns: int (really boolean) * Parameters: fin - packet information * * Check whether the packet has a valid source address for the interface on * which the packet arrived, implementing the "fr_chksrc" feature. * Returns true iff the packet's source address is valid. */ int fr_verifysrc(fin) fr_info_t *fin; { net_handle_t net_data_p; phy_if_t phy_ifdata_routeto; struct sockaddr sin; ipf_stack_t *ifs = fin->fin_ifs; if (fin->fin_v == 4) { net_data_p = ifs->ifs_ipf_ipv4; } else if (fin->fin_v == 6) { net_data_p = ifs->ifs_ipf_ipv6; } else { return (0); } /* Get the index corresponding to the if name */ sin.sa_family = (fin->fin_v == 4) ? AF_INET : AF_INET6; bcopy(&fin->fin_saddr, &sin.sa_data, sizeof (struct in_addr)); phy_ifdata_routeto = net_routeto(net_data_p, &sin, NULL); return (((phy_if_t)fin->fin_ifp == phy_ifdata_routeto) ? 1 : 0); } /* * Function: fr_fastroute * Returns: 0: success; * -1: failed * Parameters: * mb: the message block where ip head starts * mpp: the pointer to the pointer of the orignal * packet message * fin: packet information * fdp: destination interface information * if it is NULL, no interface information provided. * * This function is for fastroute/to/dup-to rules. It calls * pfil_make_lay2_packet to search route, make lay-2 header * ,and identify output queue for the IP packet. * The destination address depends on the following conditions: * 1: for fastroute rule, fdp is passed in as NULL, so the * destination address is the IP Packet's destination address * 2: for to/dup-to rule, if an ip address is specified after * the interface name, this address is the as destination * address. Otherwise IP Packet's destination address is used */ int fr_fastroute(mb, mpp, fin, fdp) mblk_t *mb, **mpp; fr_info_t *fin; frdest_t *fdp; { net_handle_t net_data_p; net_inject_t *inj; mblk_t *mp = NULL; frentry_t *fr = fin->fin_fr; qpktinfo_t *qpi; ip_t *ip; struct sockaddr_in *sin; struct sockaddr_in6 *sin6; struct sockaddr *sinp; ipf_stack_t *ifs = fin->fin_ifs; #ifndef sparc u_short __iplen, __ipoff; #endif if (fin->fin_v == 4) { net_data_p = ifs->ifs_ipf_ipv4; } else if (fin->fin_v == 6) { net_data_p = ifs->ifs_ipf_ipv6; } else { return (-1); } inj = net_inject_alloc(NETINFO_VERSION); if (inj == NULL) return -1; ip = fin->fin_ip; qpi = fin->fin_qpi; /* * If this is a duplicate mblk then we want ip to point at that * data, not the original, if and only if it is already pointing at * the current mblk data. * * Otherwise, if it's not a duplicate, and we're not already pointing * at the current mblk data, then we want to ensure that the data * points at ip. */ if ((ip == (ip_t *)qpi->qpi_m->b_rptr) && (qpi->qpi_m != mb)) { ip = (ip_t *)mb->b_rptr; } else if ((qpi->qpi_m == mb) && (ip != (ip_t *)qpi->qpi_m->b_rptr)) { qpi->qpi_m->b_rptr = (uchar_t *)ip; qpi->qpi_off = 0; } /* * If there is another M_PROTO, we don't want it */ if (*mpp != mb) { mp = unlinkb(*mpp); freeb(*mpp); *mpp = mp; } sinp = (struct sockaddr *)&inj->ni_addr; sin = (struct sockaddr_in *)sinp; sin6 = (struct sockaddr_in6 *)sinp; bzero((char *)&inj->ni_addr, sizeof (inj->ni_addr)); inj->ni_addr.ss_family = (fin->fin_v == 4) ? AF_INET : AF_INET6; inj->ni_packet = mb; /* * In case we're here due to "to " being used with * "keep state", check that we're going in the correct * direction. */ if (fdp != NULL) { if ((fr != NULL) && (fdp->fd_ifp != NULL) && (fin->fin_rev != 0) && (fdp == &fr->fr_tif)) goto bad_fastroute; inj->ni_physical = (phy_if_t)fdp->fd_ifp; if (fin->fin_v == 4) { sin->sin_addr = fdp->fd_ip; } else { sin6->sin6_addr = fdp->fd_ip6.in6; } } else { if (fin->fin_v == 4) { sin->sin_addr = ip->ip_dst; } else { sin6->sin6_addr = ((ip6_t *)ip)->ip6_dst; } inj->ni_physical = net_routeto(net_data_p, sinp, NULL); } /* * Clear the hardware checksum flags from packets that we are doing * input processing on as leaving them set will cause the outgoing * NIC (if it supports hardware checksum) to calculate them anew, * using the old (correct) checksums as the pseudo value to start * from. */ if (fin->fin_out == 0) { DB_CKSUMFLAGS(mb) = 0; } *mpp = mb; if (fin->fin_out == 0) { void *saveifp; u_32_t pass; saveifp = fin->fin_ifp; fin->fin_ifp = (void *)inj->ni_physical; fin->fin_flx &= ~FI_STATE; fin->fin_out = 1; (void) fr_acctpkt(fin, &pass); fin->fin_fr = NULL; if (!fr || !(fr->fr_flags & FR_RETMASK)) (void) fr_checkstate(fin, &pass); if (fr_checknatout(fin, NULL) == -1) goto bad_fastroute; fin->fin_out = 0; fin->fin_ifp = saveifp; } #ifndef sparc if (fin->fin_v == 4) { __iplen = (u_short)ip->ip_len, __ipoff = (u_short)ip->ip_off; ip->ip_len = htons(__iplen); ip->ip_off = htons(__ipoff); } #endif if (net_data_p) { if (net_inject(net_data_p, NI_DIRECT_OUT, inj) < 0) { net_inject_free(inj); return (-1); } } ifs->ifs_fr_frouteok[0]++; net_inject_free(inj); return 0; bad_fastroute: net_inject_free(inj); freemsg(mb); ifs->ifs_fr_frouteok[1]++; return -1; } /* ------------------------------------------------------------------------ */ /* Function: ipf_hook4_out */ /* Returns: int - 0 == packet ok, else problem, free packet if not done */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to hook information for firewalling */ /* */ /* Calling ipf_hook. */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_hook4_out(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook(info, 1, 0, arg); } /*ARGSUSED*/ int ipf_hook6_out(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook6(info, 1, 0, arg); } /* ------------------------------------------------------------------------ */ /* Function: ipf_hook4_in */ /* Returns: int - 0 == packet ok, else problem, free packet if not done */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to hook information for firewalling */ /* */ /* Calling ipf_hook. */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_hook4_in(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook(info, 0, 0, arg); } /*ARGSUSED*/ int ipf_hook6_in(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook6(info, 0, 0, arg); } /* ------------------------------------------------------------------------ */ /* Function: ipf_hook4_loop_out */ /* Returns: int - 0 == packet ok, else problem, free packet if not done */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to hook information for firewalling */ /* */ /* Calling ipf_hook. */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_hook4_loop_out(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook(info, 1, FI_NOCKSUM, arg); } /*ARGSUSED*/ int ipf_hook6_loop_out(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook6(info, 1, FI_NOCKSUM, arg); } /* ------------------------------------------------------------------------ */ /* Function: ipf_hook4_loop_in */ /* Returns: int - 0 == packet ok, else problem, free packet if not done */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to hook information for firewalling */ /* */ /* Calling ipf_hook. */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_hook4_loop_in(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook(info, 0, FI_NOCKSUM, arg); } /*ARGSUSED*/ int ipf_hook6_loop_in(hook_event_token_t token, hook_data_t info, void *arg) { return ipf_hook6(info, 0, FI_NOCKSUM, arg); } /* ------------------------------------------------------------------------ */ /* Function: ipf_hook */ /* Returns: int - 0 == packet ok, else problem, free packet if not done */ /* Parameters: info(I) - pointer to hook information for firewalling */ /* out(I) - whether packet is going in or out */ /* loopback(I) - whether packet is a loopback packet or not */ /* */ /* Stepping stone function between the IP mainline and IPFilter. Extracts */ /* parameters out of the info structure and forms them up to be useful for */ /* calling ipfilter. */ /* ------------------------------------------------------------------------ */ int ipf_hook(hook_data_t info, int out, int loopback, void *arg) { hook_pkt_event_t *fw; ipf_stack_t *ifs; qpktinfo_t qpi; int rval, hlen; u_short swap; phy_if_t phy; ip_t *ip; ifs = arg; fw = (hook_pkt_event_t *)info; ASSERT(fw != NULL); phy = (out == 0) ? fw->hpe_ifp : fw->hpe_ofp; ip = fw->hpe_hdr; swap = ntohs(ip->ip_len); ip->ip_len = swap; swap = ntohs(ip->ip_off); ip->ip_off = swap; hlen = IPH_HDR_LENGTH(ip); qpi.qpi_m = fw->hpe_mb; qpi.qpi_data = fw->hpe_hdr; qpi.qpi_off = (char *)qpi.qpi_data - (char *)fw->hpe_mb->b_rptr; qpi.qpi_ill = (void *)phy; qpi.qpi_flags = fw->hpe_flags & (HPE_MULTICAST|HPE_BROADCAST); if (qpi.qpi_flags) qpi.qpi_flags |= FI_MBCAST; qpi.qpi_flags |= loopback; rval = fr_check(fw->hpe_hdr, hlen, qpi.qpi_ill, out, &qpi, fw->hpe_mp, ifs); /* For fastroute cases, fr_check returns 0 with mp set to NULL */ if (rval == 0 && *(fw->hpe_mp) == NULL) rval = 1; /* Notify IP the packet mblk_t and IP header pointers. */ fw->hpe_mb = qpi.qpi_m; fw->hpe_hdr = qpi.qpi_data; if (rval == 0) { ip = qpi.qpi_data; swap = ntohs(ip->ip_len); ip->ip_len = swap; swap = ntohs(ip->ip_off); ip->ip_off = swap; } return rval; } int ipf_hook6(hook_data_t info, int out, int loopback, void *arg) { hook_pkt_event_t *fw; int rval, hlen; qpktinfo_t qpi; phy_if_t phy; fw = (hook_pkt_event_t *)info; ASSERT(fw != NULL); phy = (out == 0) ? fw->hpe_ifp : fw->hpe_ofp; hlen = sizeof (ip6_t); qpi.qpi_m = fw->hpe_mb; qpi.qpi_data = fw->hpe_hdr; qpi.qpi_off = (char *)qpi.qpi_data - (char *)fw->hpe_mb->b_rptr; qpi.qpi_ill = (void *)phy; qpi.qpi_flags = fw->hpe_flags & (HPE_MULTICAST|HPE_BROADCAST); if (qpi.qpi_flags) qpi.qpi_flags |= FI_MBCAST; qpi.qpi_flags |= loopback; rval = fr_check(fw->hpe_hdr, hlen, qpi.qpi_ill, out, &qpi, fw->hpe_mp, arg); /* For fastroute cases, fr_check returns 0 with mp set to NULL */ if (rval == 0 && *(fw->hpe_mp) == NULL) rval = 1; /* Notify IP the packet mblk_t and IP header pointers. */ fw->hpe_mb = qpi.qpi_m; fw->hpe_hdr = qpi.qpi_data; return rval; } /* ------------------------------------------------------------------------ */ /* Function: ipf_nic_event_v4 */ /* Returns: int - 0 == no problems encountered */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to information about a NIC event */ /* */ /* Function to receive asynchronous NIC events from IP */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_nic_event_v4(hook_event_token_t event, hook_data_t info, void *arg) { struct sockaddr_in *sin; hook_nic_event_t *hn; ipf_stack_t *ifs = arg; void *new_ifp = NULL; if (ifs->ifs_fr_running <= 0) return (0); hn = (hook_nic_event_t *)info; switch (hn->hne_event) { case NE_PLUMB : frsync(IPFSYNC_NEWIFP, 4, (void *)hn->hne_nic, hn->hne_data, ifs); fr_natifpsync(IPFSYNC_NEWIFP, 4, (void *)hn->hne_nic, hn->hne_data, ifs); fr_statesync(IPFSYNC_NEWIFP, 4, (void *)hn->hne_nic, hn->hne_data, ifs); break; case NE_UNPLUMB : frsync(IPFSYNC_OLDIFP, 4, (void *)hn->hne_nic, NULL, ifs); fr_natifpsync(IPFSYNC_OLDIFP, 4, (void *)hn->hne_nic, NULL, ifs); fr_statesync(IPFSYNC_OLDIFP, 4, (void *)hn->hne_nic, NULL, ifs); break; case NE_ADDRESS_CHANGE : /* * We only respond to events for logical interface 0 because * IPFilter only uses the first address given to a network * interface. We check for hne_lif==1 because the netinfo * code maps adds 1 to the lif number so that it can return * 0 to indicate "no more lifs" when walking them. */ if (hn->hne_lif == 1) { frsync(IPFSYNC_RESYNC, 4, (void *)hn->hne_nic, NULL, ifs); sin = hn->hne_data; fr_nataddrsync(4, (void *)hn->hne_nic, &sin->sin_addr, ifs); } break; #if SOLARIS2 >= 10 case NE_IFINDEX_CHANGE : WRITE_ENTER(&ifs->ifs_ipf_mutex); if (hn->hne_data != NULL) { /* * The netinfo passes interface index as int (hne_data should be * handled as a pointer to int), which is always 32bit. We need to * convert it to void pointer here, since interfaces are * represented as pointers to void in IPF. The pointers are 64 bits * long on 64bit platforms. Doing something like * (void *)((int) x) * will throw warning: * "cast to pointer from integer of different size" * during 64bit compilation. * * The line below uses (size_t) to typecast int to * size_t, which might be 64bit/32bit (depending * on architecture). Once we have proper 64bit/32bit * type (size_t), we can safely convert it to void pointer. */ new_ifp = (void *)(size_t)*((int *)hn->hne_data); fr_ifindexsync((void *)hn->hne_nic, new_ifp, ifs); fr_natifindexsync((void *)hn->hne_nic, new_ifp, ifs); fr_stateifindexsync((void *)hn->hne_nic, new_ifp, ifs); } RWLOCK_EXIT(&ifs->ifs_ipf_mutex); break; #endif default : break; } return 0; } /* ------------------------------------------------------------------------ */ /* Function: ipf_nic_event_v6 */ /* Returns: int - 0 == no problems encountered */ /* Parameters: event(I) - pointer to event */ /* info(I) - pointer to information about a NIC event */ /* */ /* Function to receive asynchronous NIC events from IP */ /* ------------------------------------------------------------------------ */ /*ARGSUSED*/ int ipf_nic_event_v6(hook_event_token_t event, hook_data_t info, void *arg) { struct sockaddr_in6 *sin6; hook_nic_event_t *hn; ipf_stack_t *ifs = arg; void *new_ifp = NULL; if (ifs->ifs_fr_running <= 0) return (0); hn = (hook_nic_event_t *)info; switch (hn->hne_event) { case NE_PLUMB : frsync(IPFSYNC_NEWIFP, 6, (void *)hn->hne_nic, hn->hne_data, ifs); fr_natifpsync(IPFSYNC_NEWIFP, 6, (void *)hn->hne_nic, hn->hne_data, ifs); fr_statesync(IPFSYNC_NEWIFP, 6, (void *)hn->hne_nic, hn->hne_data, ifs); break; case NE_UNPLUMB : frsync(IPFSYNC_OLDIFP, 6, (void *)hn->hne_nic, NULL, ifs); fr_natifpsync(IPFSYNC_OLDIFP, 6, (void *)hn->hne_nic, NULL, ifs); fr_statesync(IPFSYNC_OLDIFP, 6, (void *)hn->hne_nic, NULL, ifs); break; case NE_ADDRESS_CHANGE : if (hn->hne_lif == 1) { sin6 = hn->hne_data; fr_nataddrsync(6, (void *)hn->hne_nic, &sin6->sin6_addr, ifs); } break; #if SOLARIS2 >= 10 case NE_IFINDEX_CHANGE : WRITE_ENTER(&ifs->ifs_ipf_mutex); if (hn->hne_data != NULL) { /* * The netinfo passes interface index as int (hne_data should be * handled as a pointer to int), which is always 32bit. We need to * convert it to void pointer here, since interfaces are * represented as pointers to void in IPF. The pointers are 64 bits * long on 64bit platforms. Doing something like * (void *)((int) x) * will throw warning: * "cast to pointer from integer of different size" * during 64bit compilation. * * The line below uses (size_t) to typecast int to * size_t, which might be 64bit/32bit (depending * on architecture). Once we have proper 64bit/32bit * type (size_t), we can safely convert it to void pointer. */ new_ifp = (void *)(size_t)*((int *)hn->hne_data); fr_ifindexsync((void *)hn->hne_nic, new_ifp, ifs); fr_natifindexsync((void *)hn->hne_nic, new_ifp, ifs); fr_stateifindexsync((void *)hn->hne_nic, new_ifp, ifs); } RWLOCK_EXIT(&ifs->ifs_ipf_mutex); break; #endif default : break; } return 0; } /* * Functions fr_make_rst(), fr_make_icmp_v4(), fr_make_icmp_v6() * are needed in Solaris kernel only. We don't need them in * ipftest to pretend the ICMP/RST packet was sent as a response. */ #if defined(_KERNEL) && (SOLARIS2 >= 10) /* ------------------------------------------------------------------------ */ /* Function: fr_make_rst */ /* Returns: int - 0 on success, -1 on failure */ /* Parameters: fin(I) - pointer to packet information */ /* */ /* We must alter the original mblks passed to IPF from IP stack via */ /* FW_HOOKS. FW_HOOKS interface is powerfull, but it has some limitations. */ /* IPF can basicaly do only these things with mblk representing the packet: */ /* leave it as it is (pass the packet) */ /* */ /* discard it (block the packet) */ /* */ /* alter it (i.e. NAT) */ /* */ /* As you can see IPF can not simply discard the mblk and supply a new one */ /* instead to IP stack via FW_HOOKS. */ /* */ /* The return-rst action for packets coming via NIC is handled as follows: */ /* mblk with packet is discarded */ /* */ /* new mblk with RST response is constructed and injected to network */ /* */ /* IPF can't inject packets to loopback interface, this is just another */ /* limitation we have to deal with here. The only option to send RST */ /* response to offending TCP packet coming via loopback is to alter it. */ /* */ /* The fr_make_rst() function alters TCP SYN/FIN packet intercepted on */ /* loopback interface into TCP RST packet. fin->fin_mp is pointer to */ /* mblk L3 (IP) and L4 (TCP/UDP) packet headers. */ /* ------------------------------------------------------------------------ */ int fr_make_rst(fin) fr_info_t *fin; { uint16_t tmp_port; int rv = -1; uint32_t old_ack; tcphdr_t *tcp = NULL; struct in_addr tmp_src; #ifdef USE_INET6 struct in6_addr tmp_src6; #endif ASSERT(fin->fin_p == IPPROTO_TCP); /* * We do not need to adjust chksum, since it is not being checked by * Solaris IP stack for loopback clients. */ if ((fin->fin_v == 4) && (fin->fin_p == IPPROTO_TCP) && ((tcp = (tcphdr_t *) fin->fin_dp) != NULL)) { if (tcp->th_flags & (TH_SYN | TH_FIN)) { /* Swap IPv4 addresses. */ tmp_src = fin->fin_ip->ip_src; fin->fin_ip->ip_src = fin->fin_ip->ip_dst; fin->fin_ip->ip_dst = tmp_src; rv = 0; } else tcp = NULL; } #ifdef USE_INET6 else if ((fin->fin_v == 6) && (fin->fin_p == IPPROTO_TCP) && ((tcp = (tcphdr_t *) fin->fin_dp) != NULL)) { /* * We are relying on fact the next header is TCP, which is true * for regular TCP packets coming in over loopback. */ if (tcp->th_flags & (TH_SYN | TH_FIN)) { /* Swap IPv6 addresses. */ tmp_src6 = fin->fin_ip6->ip6_src; fin->fin_ip6->ip6_src = fin->fin_ip6->ip6_dst; fin->fin_ip6->ip6_dst = tmp_src6; rv = 0; } else tcp = NULL; } #endif if (tcp != NULL) { /* * Adjust TCP header: * swap ports, * set flags, * set correct ACK number */ tmp_port = tcp->th_sport; tcp->th_sport = tcp->th_dport; tcp->th_dport = tmp_port; old_ack = tcp->th_ack; tcp->th_ack = htonl(ntohl(tcp->th_seq) + 1); tcp->th_seq = old_ack; tcp->th_flags = TH_RST | TH_ACK; } return (rv); } /* ------------------------------------------------------------------------ */ /* Function: fr_make_icmp_v4 */ /* Returns: int - 0 on success, -1 on failure */ /* Parameters: fin(I) - pointer to packet information */ /* */ /* Please read comment at fr_make_icmp() wrapper function to get an idea */ /* what is going to happen here and why. Once you read the comment there, */ /* continue here with next paragraph. */ /* */ /* To turn IPv4 packet into ICMPv4 response packet, these things must */ /* happen here: */ /* (1) Original mblk is copied (duplicated). */ /* */ /* (2) ICMP header is created. */ /* */ /* (3) Link ICMP header with copy of original mblk, we have ICMPv4 */ /* data ready then. */ /* */ /* (4) Swap IP addresses in original mblk and adjust IP header data. */ /* */ /* (5) The mblk containing original packet is trimmed to contain IP */ /* header only and ICMP chksum is computed. */ /* */ /* (6) The ICMP header we have from (3) is linked to original mblk, */ /* which now contains new IP header. If original packet was spread */ /* over several mblks, only the first mblk is kept. */ /* ------------------------------------------------------------------------ */ static int fr_make_icmp_v4(fin) fr_info_t *fin; { struct in_addr tmp_src; tcphdr_t *tcp; struct icmp *icmp; mblk_t *mblk_icmp; mblk_t *mblk_ip; size_t icmp_pld_len; /* octets to append to ICMP header */ size_t orig_iphdr_len; /* length of IP header only */ uint32_t sum; uint16_t *buf; int len; if (fin->fin_v != 4) return (-1); /* * If we are dealing with TCP, then packet must be SYN/FIN to be routed * by IP stack. If it is not SYN/FIN, then we must drop it silently. */ tcp = (tcphdr_t *) fin->fin_dp; if ((fin->fin_p == IPPROTO_TCP) && ((tcp == NULL) || ((tcp->th_flags & (TH_SYN | TH_FIN)) == 0))) return (-1); /* * Step (1) * * Make copy of original mblk. * * We want to copy as much data as necessary, not less, not more. The * ICMPv4 payload length for unreachable messages is: * original IP header + 8 bytes of L4 (if there are any). * * We determine if there are at least 8 bytes of L4 data following IP * header first. */ icmp_pld_len = (fin->fin_dlen > ICMPERR_ICMPHLEN) ? ICMPERR_ICMPHLEN : fin->fin_dlen; /* * Since we don't want to copy more data than necessary, we must trim * the original mblk here. The right way (STREAMish) would be to use * adjmsg() to trim it. However we would have to calculate the length * argument for adjmsg() from pointers we already have here. * * Since we have pointers and offsets, it's faster and easier for * us to just adjust pointers by hand instead of using adjmsg(). */ fin->fin_m->b_wptr = (unsigned char *) fin->fin_dp; fin->fin_m->b_wptr += icmp_pld_len; icmp_pld_len = fin->fin_m->b_wptr - (unsigned char *) fin->fin_ip; /* * Also we don't want to copy any L2 stuff, which might precede IP * header, so we have have to set b_rptr to point to the start of IP * header. */ fin->fin_m->b_rptr += fin->fin_ipoff; if ((mblk_ip = copyb(fin->fin_m)) == NULL) return (-1); fin->fin_m->b_rptr -= fin->fin_ipoff; /* * Step (2) * * Create an ICMP header, which will be appened to original mblk later. * ICMP header is just another mblk. */ mblk_icmp = (mblk_t *) allocb(ICMPERR_ICMPHLEN, BPRI_HI); if (mblk_icmp == NULL) { FREE_MB_T(mblk_ip); return (-1); } MTYPE(mblk_icmp) = M_DATA; icmp = (struct icmp *) mblk_icmp->b_wptr; icmp->icmp_type = ICMP_UNREACH; icmp->icmp_code = fin->fin_icode & 0xFF; icmp->icmp_void = 0; icmp->icmp_cksum = 0; mblk_icmp->b_wptr += ICMPERR_ICMPHLEN; /* * Step (3) * * Complete ICMP packet - link ICMP header with L4 data from original * IP packet. */ linkb(mblk_icmp, mblk_ip); /* * Step (4) * * Swap IP addresses and change IP header fields accordingly in * original IP packet. * * There is a rule option return-icmp as a dest for physical * interfaces. This option becomes useless for loopback, since IPF box * uses same address as a loopback destination. We ignore the option * here, the ICMP packet will always look like as it would have been * sent from the original destination host. */ tmp_src = fin->fin_ip->ip_src; fin->fin_ip->ip_src = fin->fin_ip->ip_dst; fin->fin_ip->ip_dst = tmp_src; fin->fin_ip->ip_p = IPPROTO_ICMP; fin->fin_ip->ip_sum = 0; /* * Step (5) * * We trim the orignal mblk to hold IP header only. */ fin->fin_m->b_wptr = fin->fin_dp; orig_iphdr_len = fin->fin_m->b_wptr - (fin->fin_m->b_rptr + fin->fin_ipoff); fin->fin_ip->ip_len = htons(icmp_pld_len + ICMPERR_ICMPHLEN + orig_iphdr_len); /* * ICMP chksum calculation. The data we are calculating chksum for are * spread over two mblks, therefore we have to use two for loops. * * First for loop computes chksum part for ICMP header. */ buf = (uint16_t *) icmp; len = ICMPERR_ICMPHLEN; for (sum = 0; len > 1; len -= 2) sum += *buf++; /* * Here we add chksum part for ICMP payload. */ len = icmp_pld_len; buf = (uint16_t *) mblk_ip->b_rptr; for (; len > 1; len -= 2) sum += *buf++; /* * Chksum is done. */ sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); icmp->icmp_cksum = ~sum; /* * Step (6) * * Release all packet mblks, except the first one. */ if (fin->fin_m->b_cont != NULL) { FREE_MB_T(fin->fin_m->b_cont); } /* * Append ICMP payload to first mblk, which already contains new IP * header. */ linkb(fin->fin_m, mblk_icmp); return (0); } #ifdef USE_INET6 /* ------------------------------------------------------------------------ */ /* Function: fr_make_icmp_v6 */ /* Returns: int - 0 on success, -1 on failure */ /* Parameters: fin(I) - pointer to packet information */ /* */ /* Please read comment at fr_make_icmp() wrapper function to get an idea */ /* what and why is going to happen here. Once you read the comment there, */ /* continue here with next paragraph. */ /* */ /* This function turns IPv6 packet (UDP, TCP, ...) into ICMPv6 response. */ /* The algorithm is fairly simple: */ /* 1) We need to get copy of complete mblk. */ /* */ /* 2) New ICMPv6 header is created. */ /* */ /* 3) The copy of original mblk with packet is linked to ICMPv6 */ /* header. */ /* */ /* 4) The checksum must be adjusted. */ /* */ /* 5) IP addresses in original mblk are swapped and IP header data */ /* are adjusted (protocol number). */ /* */ /* 6) Original mblk is trimmed to hold IPv6 header only, then it is */ /* linked with the ICMPv6 data we got from (3). */ /* ------------------------------------------------------------------------ */ static int fr_make_icmp_v6(fin) fr_info_t *fin; { struct icmp6_hdr *icmp6; tcphdr_t *tcp; struct in6_addr tmp_src6; size_t icmp_pld_len; mblk_t *mblk_ip, *mblk_icmp; if (fin->fin_v != 6) return (-1); /* * If we are dealing with TCP, then packet must SYN/FIN to be routed by * IP stack. If it is not SYN/FIN, then we must drop it silently. */ tcp = (tcphdr_t *) fin->fin_dp; if ((fin->fin_p == IPPROTO_TCP) && ((tcp == NULL) || ((tcp->th_flags & (TH_SYN | TH_FIN)) == 0))) return (-1); /* * Step (1) * * We need to copy complete packet in case of IPv6, no trimming is * needed (except the L2 headers). */ icmp_pld_len = M_LEN(fin->fin_m); fin->fin_m->b_rptr += fin->fin_ipoff; if ((mblk_ip = copyb(fin->fin_m)) == NULL) return (-1); fin->fin_m->b_rptr -= fin->fin_ipoff; /* * Step (2) * * Allocate and create ICMP header. */ mblk_icmp = (mblk_t *) allocb(sizeof (struct icmp6_hdr), BPRI_HI); if (mblk_icmp == NULL) return (-1); MTYPE(mblk_icmp) = M_DATA; icmp6 = (struct icmp6_hdr *) mblk_icmp->b_wptr; icmp6->icmp6_type = ICMP6_DST_UNREACH; icmp6->icmp6_code = fin->fin_icode & 0xFF; icmp6->icmp6_data32[0] = 0; mblk_icmp->b_wptr += sizeof (struct icmp6_hdr); /* * Step (3) * * Link the copy of IP packet to ICMP header. */ linkb(mblk_icmp, mblk_ip); /* * Step (4) * * Calculate chksum - this is much more easier task than in case of * IPv4 - ICMPv6 chksum only covers IP addresses, and payload length. * We are making compensation just for change of packet length. */ icmp6->icmp6_cksum = icmp_pld_len + sizeof (struct icmp6_hdr); /* * Step (5) * * Swap IP addresses. */ tmp_src6 = fin->fin_ip6->ip6_src; fin->fin_ip6->ip6_src = fin->fin_ip6->ip6_dst; fin->fin_ip6->ip6_dst = tmp_src6; /* * and adjust IP header data. */ fin->fin_ip6->ip6_nxt = IPPROTO_ICMPV6; fin->fin_ip6->ip6_plen = htons(icmp_pld_len + sizeof (struct icmp6_hdr)); /* * Step (6) * * We must release all linked mblks from original packet and keep only * the first mblk with IP header to link ICMP data. */ fin->fin_m->b_wptr = (unsigned char *) fin->fin_ip6 + sizeof (ip6_t); if (fin->fin_m->b_cont != NULL) { FREE_MB_T(fin->fin_m->b_cont); } /* * Append ICMP payload to IP header. */ linkb(fin->fin_m, mblk_icmp); return (0); } #endif /* USE_INET6 */ /* ------------------------------------------------------------------------ */ /* Function: fr_make_icmp */ /* Returns: int - 0 on success, -1 on failure */ /* Parameters: fin(I) - pointer to packet information */ /* */ /* We must alter the original mblks passed to IPF from IP stack via */ /* FW_HOOKS. The reasons why we must alter packet are discussed within */ /* comment at fr_make_rst() function. */ /* */ /* The fr_make_icmp() function acts as a wrapper, which passes the code */ /* execution to fr_make_icmp_v4() or fr_make_icmp_v6() depending on */ /* protocol version. However there are some details, which are common to */ /* both IP versions. The details are going to be explained here. */ /* */ /* The packet looks as follows: */ /* xxx | IP hdr | IP payload ... | */ /* ^ ^ ^ ^ */ /* | | | | */ /* | | | fin_m->b_wptr = fin->fin_dp + fin->fin_dlen */ /* | | | */ /* | | `- fin_m->fin_dp (in case of IPv4 points to L4 header) */ /* | | */ /* | `- fin_m->b_rptr + fin_ipoff (fin_ipoff is most likely 0 in case */ /* | of loopback) */ /* | */ /* `- fin_m->b_rptr - points to L2 header in case of physical NIC */ /* */ /* All relevant IP headers are pulled up into the first mblk. It happened */ /* well in advance before the matching rule was found (the rule, which took */ /* us here, to fr_make_icmp() function). */ /* */ /* Both functions will turn packet passed in fin->fin_m mblk into a new */ /* packet. New packet will be represented as chain of mblks. */ /* orig mblk |- b_cont ---. */ /* ^ `-> ICMP hdr |- b_cont--. */ /* | ^ `-> duped orig mblk */ /* | | ^ */ /* `- The original mblk | | */ /* will be trimmed to | | */ /* to contain IP header | | */ /* only | | */ /* | | */ /* `- This is newly | */ /* allocated mblk to | */ /* hold ICMPv6 data. | */ /* | */ /* | */ /* | */ /* This is the copy of original mblk, it will contain -' */ /* orignal IP packet in case of ICMPv6. In case of */ /* ICMPv4 it will contain up to 8 bytes of IP payload */ /* (TCP/UDP/L4) data from original packet. */ /* ------------------------------------------------------------------------ */ int fr_make_icmp(fin) fr_info_t *fin; { int rv; if (fin->fin_v == 4) rv = fr_make_icmp_v4(fin); #ifdef USE_INET6 else if (fin->fin_v == 6) rv = fr_make_icmp_v6(fin); #endif else rv = -1; return (rv); } #endif /* _KERNEL && SOLARIS2 >= 10 */