static void __exit fini(void) { DEBUGP("ipt_ULOG: cleanup_module\n"); ipt_unregister_target(&ipt_ulog_reg); sock_release(nflognl->socket); }
static void __exit fini(void) { ulog_buff_t *ub; int i; DEBUGP("ipt_ULOG: cleanup_module\n"); if (nflog) nf_log_unregister_logger(&ipt_ulog_logger); ipt_unregister_target(&ipt_ulog_reg); sock_release(nflognl->sk_socket); /* remove pending timers and free allocated skb's */ for (i = 0; i < ULOG_MAXNLGROUPS; i++) { ub = &ulog_buffers[i]; if (timer_pending(&ub->timer)) { DEBUGP("timer was pending, deleting\n"); del_timer(&ub->timer); } if (ub->skb) { kfree_skb(ub->skb); ub->skb = NULL; } } }
static void __exit ip_acct_exit (void) { printk ("unloading ipt_ACCT v%s\n", IPT_ACCT_VERSION); ipt_unregister_target (&ipt_acct_target); if (timeout > 0 && timer_pending (&dump_timer)) del_timer (&dump_timer); misc_deregister (&ipt_acct_device); kfree (layers); kfree (pool_0); kfree (pool_1); kfree (item_pool_0); kfree (item_pool_1); }
int __init ip_nat_rule_init(void) { int ret; ret = ipt_register_table(&nat_table, &nat_initial_table.repl); if (ret != 0) return ret; ret = ipt_register_target(&ipt_snat_reg); if (ret != 0) goto unregister_table; ret = ipt_register_target(&ipt_dnat_reg); if (ret != 0) goto unregister_snat; return ret; unregister_snat: ipt_unregister_target(&ipt_snat_reg); unregister_table: ipt_unregister_table(&nat_table); return ret; }
static void __exit fini(void) { ipt_unregister_target(&ipt_route_reg); }
void ip_nat_rule_cleanup(void) { ipt_unregister_target(&ipt_dnat_reg); ipt_unregister_target(&ipt_snat_reg); ipt_unregister_table(&nat_table); }
static void __exit fini(void) { nf_log_unregister_logger(&ipt_log_logger); ipt_unregister_target(&ipt_log_reg); }
/* Try to route the packet according to the routing keys specified in * route_info. Keys are : * - ifindex : * 0 if no oif preferred, * otherwise set to the index of the desired oif * - route_info->gw : * 0 if no gateway specified, * otherwise set to the next host to which the pkt must be routed * If success, skb->dev is the output device to which the packet must * be sent and skb->dst is not NULL * * RETURN: -1 if an error occured * 1 if the packet was succesfully routed to the * destination desired * 0 if the kernel routing table could not route the packet * according to the keys specified */ static int route(struct sk_buff *skb, unsigned int ifindex, const struct ipt_route_target_info *route_info) { int err; struct rtable *rt; #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) struct iphdr *iph = ip_hdr(skb); #else struct iphdr *iph = skb->nh.iph; #endif struct flowi fl = { .oif = ifindex, .nl_u = { .ip4_u = { .daddr = iph->daddr, .saddr = 0, .tos = RT_TOS(iph->tos), .scope = RT_SCOPE_UNIVERSE, } } }; /* The destination address may be overloaded by the target */ if (route_info->gw) fl.fl4_dst = route_info->gw; /* Trying to route the packet using the standard routing table. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) if ((err = ip_route_output_key(&init_net, &rt, &fl))) { #else if ((err = ip_route_output_key(&rt, &fl))) { #endif if (net_ratelimit()) DEBUGP("ipt_ROUTE: couldn't route pkt (err: %i)",err); return -1; } /* Drop old route. */ dst_release(skb->dst); skb->dst = NULL; /* Success if no oif specified or if the oif correspond to the * one desired */ if (!ifindex || rt->u.dst.dev->ifindex == ifindex) { skb->dst = &rt->u.dst; skb->dev = skb->dst->dev; skb->protocol = htons(ETH_P_IP); return 1; } /* The interface selected by the routing table is not the one * specified by the user. This may happen because the dst address * is one of our own addresses. */ if (net_ratelimit()) DEBUGP("ipt_ROUTE: failed to route as desired gw=%u.%u.%u.%u oif=%i (got oif=%i)\n", NIPQUAD(route_info->gw), ifindex, rt->u.dst.dev->ifindex); return 0; } /* Stolen from ip_finish_output2 * PRE : skb->dev is set to the device we are leaving by * skb->dst is not NULL * POST: the packet is sent with the link layer header pushed * the packet is destroyed */ static void ip_direct_send(struct sk_buff *skb) { struct dst_entry *dst = skb->dst; struct hh_cache *hh = dst->hh; struct net_device *dev = dst->dev; int hh_len = LL_RESERVED_SPACE(dev); unsigned seq; /* Be paranoid, rather than too clever. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { #else if (unlikely(skb_headroom(skb) < hh_len && dev->hard_header)) { #endif struct sk_buff *skb2; skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); if (skb2 == NULL) { kfree_skb(skb); return; } if (skb->sk) skb_set_owner_w(skb2, skb->sk); kfree_skb(skb); skb = skb2; } if (hh) { do { int hh_alen; seq = read_seqbegin(&hh->hh_lock); hh_alen = HH_DATA_ALIGN(hh->hh_len); memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); } while (read_seqretry(&hh->hh_lock, seq)); skb_push(skb, hh->hh_len); hh->hh_output(skb); } else if (dst->neighbour) dst->neighbour->output(skb); else { if (net_ratelimit()) DEBUGP(KERN_DEBUG "ipt_ROUTE: no hdr & no neighbour cache!\n"); kfree_skb(skb); } } /* PRE : skb->dev is set to the device we are leaving by * POST: - the packet is directly sent to the skb->dev device, without * pushing the link layer header. * - the packet is destroyed */ static inline int dev_direct_send(struct sk_buff *skb) { return dev_queue_xmit(skb); } static unsigned int route_oif(const struct ipt_route_target_info *route_info, struct sk_buff *skb) { unsigned int ifindex = 0; struct net_device *dev_out = NULL; /* The user set the interface name to use. * Getting the current interface index. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) if ((dev_out = dev_get_by_name(&init_net, route_info->oif))) { #else if ((dev_out = dev_get_by_name(route_info->oif))) { #endif ifindex = dev_out->ifindex; } else { /* Unknown interface name : packet dropped */ if (net_ratelimit()) DEBUGP("ipt_ROUTE: oif interface %s not found\n", route_info->oif); return NF_DROP; } /* Trying the standard way of routing packets */ switch (route(skb, ifindex, route_info)) { case 1: dev_put(dev_out); if (route_info->flags & IPT_ROUTE_CONTINUE) return IPT_CONTINUE; ip_direct_send(skb); return NF_STOLEN; case 0: /* Failed to send to oif. Trying the hard way */ if (route_info->flags & IPT_ROUTE_CONTINUE) return NF_DROP; if (net_ratelimit()) DEBUGP("ipt_ROUTE: forcing the use of %i\n", ifindex); /* We have to force the use of an interface. * This interface must be a tunnel interface since * otherwise we can't guess the hw address for * the packet. For a tunnel interface, no hw address * is needed. */ if ((dev_out->type != ARPHRD_TUNNEL) && (dev_out->type != ARPHRD_IPGRE)) { if (net_ratelimit()) DEBUGP("ipt_ROUTE: can't guess the hw addr !\n"); dev_put(dev_out); return NF_DROP; } /* Send the packet. This will also free skb * Do not go through the POST_ROUTING hook because * skb->dst is not set and because it will probably * get confused by the destination IP address. */ skb->dev = dev_out; dev_direct_send(skb); dev_put(dev_out); return NF_STOLEN; default: /* Unexpected error */ dev_put(dev_out); return NF_DROP; } } static unsigned int route_iif(const struct ipt_route_target_info *route_info, struct sk_buff *skb) { struct net_device *dev_in = NULL; /* Getting the current interface index. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) if (!(dev_in = dev_get_by_name(&init_net, route_info->iif))) { #else if (!(dev_in = dev_get_by_name(route_info->iif))) { #endif if (net_ratelimit()) DEBUGP("ipt_ROUTE: iif interface %s not found\n", route_info->iif); return NF_DROP; } skb->dev = dev_in; dst_release(skb->dst); skb->dst = NULL; netif_rx(skb); dev_put(dev_in); return NF_STOLEN; } static unsigned int route_gw(const struct ipt_route_target_info *route_info, struct sk_buff *skb) { if (route(skb, 0, route_info)!=1) return NF_DROP; if (route_info->flags & IPT_ROUTE_CONTINUE) return IPT_CONTINUE; ip_direct_send(skb); return NF_STOLEN; } /* To detect and deter routed packet loopback when using the --tee option, * we take a page out of the raw.patch book: on the copied skb, we set up * a fake ->nfct entry, pointing to the local &route_tee_track. We skip * routing packets when we see they already have that ->nfct. */ static struct nf_conn route_tee_track; static unsigned int #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) target(struct sk_buff **pskb, unsigned int hooknum, const struct net_device *in, const struct net_device *out, const void *targinfo, void *userinfo) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17) target(struct sk_buff **pskb, const struct net_device *in, const struct net_device *out, unsigned int hooknum, const void *targinfo, void *userinfo) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) target(struct sk_buff **pskb, const struct net_device *in, const struct net_device *out, unsigned int hooknum, const struct xt_target *target, const void *targinfo, void *userinfo) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) target(struct sk_buff **pskb, const struct net_device *in, const struct net_device *out, unsigned int hooknum, const struct xt_target *target, const void *targinfo) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) target(struct sk_buff *skb, const struct net_device *in, const struct net_device *out, unsigned int hooknum, const struct xt_target *target, const void *targinfo) #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) */ target(struct sk_buff *skb, const struct xt_target_param *par) #endif { #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) const struct ipt_route_target_info *route_info = targinfo; #else const struct ipt_route_target_info *route_info = par->targinfo; unsigned int hooknum = par->hooknum; #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) struct sk_buff *skb = *pskb; #endif unsigned int res; if (skb->nfct == &route_tee_track.ct_general) { /* Loopback - a packet we already routed, is to be * routed another time. Avoid that, now. */ if (net_ratelimit()) DEBUGP(KERN_DEBUG "ipt_ROUTE: loopback - DROP!\n"); return NF_DROP; } /* If we are at PREROUTING or INPUT hook * the TTL isn't decreased by the IP stack */ if (hooknum == NF_INET_PRE_ROUTING || hooknum == NF_INET_LOCAL_IN) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) struct iphdr *iph = ip_hdr(skb); #else struct iphdr *iph = skb->nh.iph; #endif if (iph->ttl <= 1) { struct rtable *rt; struct flowi fl = { .oif = 0, .nl_u = { .ip4_u = { .daddr = iph->daddr, .saddr = iph->saddr, .tos = RT_TOS(iph->tos), .scope = ((iph->tos & RTO_ONLINK) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE) } } }; #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) if (ip_route_output_key(&init_net, &rt, &fl)) { #else if (ip_route_output_key(&rt, &fl)) { #endif return NF_DROP; } if (skb->dev == rt->u.dst.dev) { /* Drop old route. */ dst_release(skb->dst); skb->dst = &rt->u.dst; /* this will traverse normal stack, and * thus call conntrack on the icmp packet */ icmp_send(skb, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL, 0); } return NF_DROP; } /* * If we are at INPUT the checksum must be recalculated since * the length could change as the result of a defragmentation. */ if(hooknum == NF_INET_LOCAL_IN) { iph->ttl = iph->ttl - 1; iph->check = 0; iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); } else { ip_decrease_ttl(iph); } } if ((route_info->flags & IPT_ROUTE_TEE)) { /* * Copy the skb, and route the copy. Will later return * IPT_CONTINUE for the original skb, which should continue * on its way as if nothing happened. The copy should be * independantly delivered to the ROUTE --gw. */ skb = skb_copy(skb, GFP_ATOMIC); if (!skb) { if (net_ratelimit()) DEBUGP(KERN_DEBUG "ipt_ROUTE: copy failed!\n"); return IPT_CONTINUE; } } /* Tell conntrack to forget this packet since it may get confused * when a packet is leaving with dst address == our address. * Good idea ? Dunno. Need advice. * * NEW: mark the skb with our &route_tee_track, so we avoid looping * on any already routed packet. */ if (!(route_info->flags & IPT_ROUTE_CONTINUE)) { nf_conntrack_put(skb->nfct); skb->nfct = &route_tee_track.ct_general; skb->nfctinfo = IP_CT_NEW; nf_conntrack_get(skb->nfct); } if (route_info->oif[0] != '\0') { res = route_oif(route_info, skb); } else if (route_info->iif[0] != '\0') { res = route_iif(route_info, skb); } else if (route_info->gw) { res = route_gw(route_info, skb); } else { if (net_ratelimit()) DEBUGP(KERN_DEBUG "ipt_ROUTE: no parameter !\n"); res = IPT_CONTINUE; } if ((route_info->flags & IPT_ROUTE_TEE)) res = IPT_CONTINUE; return res; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) static int checkentry(const char *tablename, const struct ipt_entry *e, void *targinfo, unsigned int targinfosize, unsigned int hook_mask) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17) static int checkentry(const char *tablename, const void *e, void *targinfo, unsigned int targinfosize, unsigned int hook_mask) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) static int checkentry(const char *tablename, const void *e, const struct xt_target *target, void *targinfo, unsigned int targinfosize, unsigned int hook_mask) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) static int checkentry(const char *tablename, const void *e, const struct xt_target *target, void *targinfo, unsigned int hook_mask) #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) static bool checkentry(const char *tablename, const void *e, const struct xt_target *target, void *targinfo, unsigned int hook_mask) #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) */ static bool checkentry(const struct xt_tgchk_param *par) #endif { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28) const char *tablename = par->table; unsigned int hook_mask = par->hook_mask; #endif if (strcmp(tablename, "mangle") != 0) { printk("ipt_ROUTE: bad table `%s', use the `mangle' table.\n", tablename); return 0; } if (hook_mask & ~( (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_POST_ROUTING))) { printk("ipt_ROUTE: bad hook\n"); return 0; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) if (targinfosize != IPT_ALIGN(sizeof(struct ipt_route_target_info))) { printk(KERN_WARNING "ipt_ROUTE: targinfosize %u != %Zu\n", targinfosize, IPT_ALIGN(sizeof(struct ipt_route_target_info))); return 0; } #endif return 1; } #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) static struct ipt_target xt_route_reg = { #else static struct ipt_target ipt_route_reg = { #endif .name = "ROUTE", #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) .family = AF_INET, #endif .target = target, #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) .targetsize = sizeof(struct ipt_route_target_info), #endif .checkentry = checkentry, .me = THIS_MODULE, }; static int __init init(void) { /* Set up fake conntrack (stolen from raw.patch): - to never be deleted, not in any hashes */ atomic_set(&route_tee_track.ct_general.use, 1); /* - and look it like as a confirmed connection */ set_bit(IPS_CONFIRMED_BIT, &route_tee_track.status); /* Initialize fake conntrack so that NAT will skip it */ route_tee_track.status |= IPS_NAT_DONE_MASK; #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) return xt_register_target(&xt_route_reg); #else return ipt_register_target(&ipt_route_reg); #endif } static void __exit fini(void) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) xt_unregister_target(&xt_route_reg); #else ipt_unregister_target(&ipt_route_reg); #endif } module_init(init); module_exit(fini);
static void __exit fini(void) { ipt_unregister_target(&ipt_classify_reg); }
static void ipt_logfn(unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const char *prefix) { struct ipt_ulog_info loginfo = { .nl_group = ULOG_DEFAULT_NLGROUP, .copy_range = 0, .qthreshold = ULOG_DEFAULT_QTHRESHOLD, .prefix = "" }; ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix); } static int ipt_ulog_checkentry(const char *tablename, const struct ipt_entry *e, void *targinfo, unsigned int targinfosize, unsigned int hookmask) { struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) targinfo; if (targinfosize != IPT_ALIGN(sizeof(struct ipt_ulog_info))) { DEBUGP("ipt_ULOG: targinfosize %u != 0\n", targinfosize); return 0; } if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') { DEBUGP("ipt_ULOG: prefix term %i\n", loginfo->prefix[sizeof(loginfo->prefix) - 1]); return 0; } if (loginfo->qthreshold > ULOG_MAX_QLEN) { DEBUGP("ipt_ULOG: queue threshold %i > MAX_QLEN\n", loginfo->qthreshold); return 0; } return 1; } static struct ipt_target ipt_ulog_reg = { .name = "ULOG", .target = ipt_ulog_target, .checkentry = ipt_ulog_checkentry, .me = THIS_MODULE, }; static int __init init(void) { int i; DEBUGP("ipt_ULOG: init module\n"); if (nlbufsiz >= 128*1024) { printk("Netlink buffer has to be <= 128kB\n"); return -EINVAL; } /* initialize ulog_buffers */ for (i = 0; i < ULOG_MAXNLGROUPS; i++) { init_timer(&ulog_buffers[i].timer); ulog_buffers[i].timer.function = ulog_timer; ulog_buffers[i].timer.data = i; } nflognl = netlink_kernel_create(NETLINK_NFLOG, NULL); if (!nflognl) return -ENOMEM; if (ipt_register_target(&ipt_ulog_reg) != 0) { sock_release(nflognl->sk_socket); return -EINVAL; } if (nflog) nf_log_register(PF_INET, &ipt_logfn); return 0; } static void __exit fini(void) { ulog_buff_t *ub; int i; DEBUGP("ipt_ULOG: cleanup_module\n"); if (nflog) nf_log_unregister(PF_INET, &ipt_logfn); ipt_unregister_target(&ipt_ulog_reg); sock_release(nflognl->sk_socket); /* remove pending timers and free allocated skb's */ for (i = 0; i < ULOG_MAXNLGROUPS; i++) { ub = &ulog_buffers[i]; if (timer_pending(&ub->timer)) { DEBUGP("timer was pending, deleting\n"); del_timer(&ub->timer); } if (ub->skb) { kfree_skb(ub->skb); ub->skb = NULL; } } }
static void __exit ipt_daddr_fini(void) { ipt_unregister_target(&ipt_daddr_reg); }
static void __exit fini(void) { ipt_unregister_target(&ipt_connmark_reg); }
static void __exit fini(void) { ipt_unregister_target(&ipt_IPID); }
static void __exit fini(void) { ipt_unregister_target(&ipt_mirror_reg); }
static void __exit ipt_reject_fini(void) { ipt_unregister_target(&ipt_reject_reg); }
static void __exit fini(void) { ipt_unregister_target(&ipt_trigger_reg); del_timer(&trigger_timer); }
static void ipt_logfn(unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const char *prefix) { struct ipt_log_info loginfo = { .level = 0, .logflags = IPT_LOG_MASK, .prefix = "" }; ipt_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix); } static int ipt_log_checkentry(const char *tablename, const struct ipt_entry *e, void *targinfo, unsigned int targinfosize, unsigned int hook_mask) { const struct ipt_log_info *loginfo = targinfo; if (targinfosize != IPT_ALIGN(sizeof(struct ipt_log_info))) { DEBUGP("LOG: targinfosize %u != %u\n", targinfosize, IPT_ALIGN(sizeof(struct ipt_log_info))); return 0; } if (loginfo->level >= 8) { DEBUGP("LOG: level %u >= 8\n", loginfo->level); return 0; } if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { DEBUGP("LOG: prefix term %i\n", loginfo->prefix[sizeof(loginfo->prefix)-1]); return 0; } return 1; } static struct ipt_target ipt_log_reg = { .name = "LOG", .target = ipt_log_target, .checkentry = ipt_log_checkentry, .me = THIS_MODULE, }; static int __init init(void) { if (ipt_register_target(&ipt_log_reg)) return -EINVAL; if (nflog) nf_log_register(PF_INET, &ipt_logfn); return 0; } static void __exit fini(void) { if (nflog) nf_log_unregister(PF_INET, &ipt_logfn); ipt_unregister_target(&ipt_log_reg); } module_init(init); module_exit(fini);