Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following large patchset contains Netfilter updates for your
net-next tree. My initial intention was to send you this in two goes but
when I looked back twice I already had this burden on top of me.

Several updates for IPVS from Marco Angaroni:

1) Allow SIP connections originating from real-servers to be load
balanced by the SIP persistence engine as is already implemented
in the other direction.

2) Release connections immediately for One-packet-scheduling (OPS)
in IPVS, instead of making it via timer and rcu callback.

3) Skip deleting conntracks for each one packet in OPS, and don't call
nf_conntrack_alter_reply() since no reply is expected.

4) Enable drop on exhaustion for OPS + SIP persistence.

Miscelaneous conntrack updates from Florian Westphal, including fix for
hash resize:

5) Move conntrack generation counter out of conntrack pernet structure
since this is only used by the init_ns to allow hash resizing.

6) Use get_random_once() from packet path to collect hash random seed
instead of our compound.

7) Don't disable BH from ____nf_conntrack_find() for statistics,
use NF_CT_STAT_INC_ATOMIC() instead.

8) Fix lookup race during conntrack hash resizing.

9) Introduce clash resolution on conntrack insertion for connectionless
protocol.

Then, Florian's netns rework to get rid of per-netns conntrack table,
thus we use one single table for them all. There was consensus on this
change during the NFWS 2015 and, on top of that, it has recently been
pointed as a source of multiple problems from unpriviledged netns:

11) Use a single conntrack hashtable for all namespaces. Include netns
in object comparisons and make it part of the hash calculation.
Adapt early_drop() to consider netns.

12) Use single expectation and NAT hashtable for all namespaces.

13) Use a single slab cache for all namespaces for conntrack objects.

14) Skip full table scanning from nf_ct_iterate_cleanup() if the pernet
conntrack counter tells us the table is empty (ie. equals zero).

Fixes for nf_tables interval set element handling, support to set
conntrack connlabels and allow set names up to 32 bytes.

15) Parse element flags from element deletion path and pass it up to the
backend set implementation.

16) Allow adjacent intervals in the rbtree set type for dynamic interval
updates.

17) Add support to set connlabel from nf_tables, from Florian Westphal.

18) Allow set names up to 32 bytes in nf_tables.

Several x_tables fixes and updates:

19) Fix incorrect use of IS_ERR_VALUE() in x_tables, original patch
from Andrzej Hajda.

And finally, miscelaneous netfilter updates such as:

20) Disable automatic helper assignment by default. Note this proc knob
was introduced by a9006892643a ("netfilter: nf_ct_helper: allow to
disable automatic helper assignment") 4 years ago to start moving
towards explicit conntrack helper configuration via iptables CT
target.

21) Get rid of obsolete and inconsistent debugging instrumentation
in x_tables.

22) Remove unnecessary check for null after ip6_route_output().
====================

Signed-off-by: David S. Miller <[e-mail]>

include/linux/netfilter/x_tables.h

···
  * allows us to return 0 for single core systems without forcing
  * callers to deal with SMP vs. NONSMP issues.
  */
-static inline u64 xt_percpu_counter_alloc(void)
+static inline unsigned long xt_percpu_counter_alloc(void)
 {
 	if (nr_cpu_ids > 1) {
 		void __percpu *res = __alloc_percpu(sizeof(struct xt_counters),
 						    sizeof(struct xt_counters));
 
 		if (res == NULL)
-			return (u64) -ENOMEM;
+			return -ENOMEM;
 
-		return (u64) (__force unsigned long) res;
+		return (__force unsigned long) res;
 	}
 
 	return 0;

include/net/ip_vs.h

···
 	u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 			   bool inverse);
 	int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
+	/* create connections for real-server outgoing packets */
+	struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
+				       struct ip_vs_dest *dest,
+				       struct sk_buff *skb,
+				       const struct ip_vs_iphdr *iph,
+				       __be16 dport, __be16 cport);
 };
 
 /* The application module object (a.k.a. app incarnation) */
···
 	/* Service counters */
 	atomic_t		ftpsvc_counter;
 	atomic_t		nullsvc_counter;
+	atomic_t		conn_out_counter;
 
 #ifdef CONFIG_SYSCTL
 	/* 1/rate drop and drop-entry variables */
···
  */
 const char *ip_vs_proto_name(unsigned int proto);
 void ip_vs_init_hash_table(struct list_head *table, int rows);
+struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
+				      struct ip_vs_dest *dest,
+				      struct sk_buff *skb,
+				      const struct ip_vs_iphdr *iph,
+				      __be16 dport,
+				      __be16 cport);
 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 
 #define IP_VS_APP_TYPE_FTP	1
···
 
 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
 			    const union nf_inet_addr *daddr, __be16 dport);
+
+struct ip_vs_dest *
+ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
+			const union nf_inet_addr *daddr, __be16 dport);
 
 int ip_vs_use_count_inc(void);
 void ip_vs_use_count_dec(void);

include/net/netfilter/nf_conntrack.h

···
 int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
 extern unsigned int nf_conntrack_htable_size;
 extern unsigned int nf_conntrack_max;
-extern unsigned int nf_conntrack_hash_rnd;
-void init_nf_conntrack_hash_rnd(void);
 
 struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
 				 const struct nf_conntrack_zone *zone,

include/net/netfilter/nf_conntrack_core.h

···
 
 #define CONNTRACK_LOCKS 1024
 
+extern struct hlist_nulls_head *nf_conntrack_hash;
 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
 void nf_conntrack_lock(spinlock_t *lock);
 

include/net/netfilter/nf_conntrack_expect.h

···
 
 extern unsigned int nf_ct_expect_hsize;
 extern unsigned int nf_ct_expect_max;
+extern struct hlist_head *nf_ct_expect_hash;
 
 struct nf_conntrack_expect {
 	/* Conntrack expectation list member */

include/net/netfilter/nf_conntrack_l4proto.h

···
 	/* L4 Protocol number. */
 	u_int8_t l4proto;
 
+	/* Resolve clashes on insertion races. */
+	bool allow_clash;
+
 	/* Try to fill in the third arg: dataoff is offset past network protocol
            hdr.  Return true if possible. */
 	bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,

include/net/netfilter/nf_tables.h

···
 struct nft_set {
 	struct list_head		list;
 	struct list_head		bindings;
-	char				name[IFNAMSIZ];
+	char				name[NFT_SET_MAXNAMELEN];
 	u32				ktype;
 	u32				dtype;
 	u32				size;

include/net/netns/conntrack.h

···
 	struct ctl_table_header	*event_sysctl_header;
 	struct ctl_table_header	*helper_sysctl_header;
 #endif
-	char			*slabname;
 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
 	int			sysctl_events;
 	int			sysctl_acct;
···
 	int			sysctl_tstamp;
 	int			sysctl_checksum;
 
-	unsigned int		htable_size;
-	seqcount_t		generation;
-	struct kmem_cache	*nf_conntrack_cachep;
-	struct hlist_nulls_head	*hash;
-	struct hlist_head	*expect_hash;
 	struct ct_pcpu __percpu *pcpu_lists;
 	struct ip_conntrack_stat __percpu *stat;
 	struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
···
 #if defined(CONFIG_NF_CONNTRACK_LABELS)
 	unsigned int		labels_used;
 	u8			label_words;
-#endif
-#ifdef CONFIG_NF_NAT_NEEDED
-	struct hlist_head	*nat_bysource;
-	unsigned int		nat_htable_size;
 #endif
 };
 #endif

include/uapi/linux/netfilter/nf_tables.h

···
 
 #define NFT_TABLE_MAXNAMELEN	32
 #define NFT_CHAIN_MAXNAMELEN	32
+#define NFT_SET_MAXNAMELEN	32
 #define NFT_USERDATA_MAXLEN	256
 
 /**

net/ipv4/netfilter/arp_tables.c

···
 MODULE_AUTHOR("David S. Miller <[e-mail]>");
 MODULE_DESCRIPTION("arptables core");
 
-/*#define DEBUG_ARP_TABLES*/
-/*#define DEBUG_ARP_TABLES_USER*/
-
-#ifdef DEBUG_ARP_TABLES
-#define dprintf(format, args...)  pr_debug(format, ## args)
-#else
-#define dprintf(format, args...)
-#endif
-
-#ifdef DEBUG_ARP_TABLES_USER
-#define duprintf(format, args...) pr_debug(format, ## args)
-#else
-#define duprintf(format, args...)
-#endif
-
-#ifdef CONFIG_NETFILTER_DEBUG
-#define ARP_NF_ASSERT(x)	WARN_ON(!(x))
-#else
-#define ARP_NF_ASSERT(x)
-#endif
-
 void *arpt_alloc_initial_table(const struct xt_table *info)
 {
 	return xt_alloc_initial_table(arpt, ARPT);
···
 #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg)))
 
 	if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop,
-		  ARPT_INV_ARPOP)) {
-		dprintf("ARP operation field mismatch.\n");
-		dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n",
-			arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask);
+		  ARPT_INV_ARPOP))
 		return 0;
-	}
 
 	if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd,
-		  ARPT_INV_ARPHRD)) {
-		dprintf("ARP hardware address format mismatch.\n");
-		dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n",
-			arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask);
+		  ARPT_INV_ARPHRD))
 		return 0;
-	}
 
 	if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro,
-		  ARPT_INV_ARPPRO)) {
-		dprintf("ARP protocol address format mismatch.\n");
-		dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n",
-			arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask);
+		  ARPT_INV_ARPPRO))
 		return 0;
-	}
 
 	if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln,
-		  ARPT_INV_ARPHLN)) {
-		dprintf("ARP hardware address length mismatch.\n");
-		dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n",
-			arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask);
+		  ARPT_INV_ARPHLN))
 		return 0;
-	}
 
 	src_devaddr = arpptr;
 	arpptr += dev->addr_len;
···
 	if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len),
 		  ARPT_INV_SRCDEVADDR) ||
 	    FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len),
-		  ARPT_INV_TGTDEVADDR)) {
-		dprintf("Source or target device address mismatch.\n");
-
+		  ARPT_INV_TGTDEVADDR))
 		return 0;
-	}
 
 	if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr,
 		  ARPT_INV_SRCIP) ||
 	    FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr),
-		  ARPT_INV_TGTIP)) {
-		dprintf("Source or target IP address mismatch.\n");
-
-		dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
-			&src_ipaddr,
-			&arpinfo->smsk.s_addr,
-			&arpinfo->src.s_addr,
-			arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : "");
-		dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n",
-			&tgt_ipaddr,
-			&arpinfo->tmsk.s_addr,
-			&arpinfo->tgt.s_addr,
-			arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : "");
+		  ARPT_INV_TGTIP))
 		return 0;
-	}
 
 	/* Look for ifname matches.  */
 	ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask);
 
-	if (FWINV(ret != 0, ARPT_INV_VIA_IN)) {
-		dprintf("VIA in mismatch (%s vs %s).%s\n",
-			indev, arpinfo->iniface,
-			arpinfo->invflags & ARPT_INV_VIA_IN ? " (INV)" : "");
+	if (FWINV(ret != 0, ARPT_INV_VIA_IN))
 		return 0;
-	}
 
 	ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask);
 
-	if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
-		dprintf("VIA out mismatch (%s vs %s).%s\n",
-			outdev, arpinfo->outiface,
-			arpinfo->invflags & ARPT_INV_VIA_OUT ? " (INV)" : "");
+	if (FWINV(ret != 0, ARPT_INV_VIA_OUT))
 		return 0;
-	}
 
 	return 1;
 #undef FWINV
···
 
 static inline int arp_checkentry(const struct arpt_arp *arp)
 {
-	if (arp->flags & ~ARPT_F_MASK) {
-		duprintf("Unknown flag bits set: %08X\n",
-			 arp->flags & ~ARPT_F_MASK);
+	if (arp->flags & ~ARPT_F_MASK)
 		return 0;
-	}
-	if (arp->invflags & ~ARPT_INV_MASK) {
-		duprintf("Unknown invflag bits set: %08X\n",
-			 arp->invflags & ~ARPT_INV_MASK);
+	if (arp->invflags & ~ARPT_INV_MASK)
 		return 0;
-	}
 
 	return 1;
 }
···
 				= (void *)arpt_get_target_c(e);
 			int visited = e->comefrom & (1 << hook);
 
-			if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) {
-				pr_notice("arptables: loop hook %u pos %u %08X.\n",
-				       hook, pos, e->comefrom);
+			if (e->comefrom & (1 << NF_ARP_NUMHOOKS))
 				return 0;
-			}
+
 			e->comefrom
 				|= ((1 << hook) | (1 << NF_ARP_NUMHOOKS));
 
···
 
 				if ((strcmp(t->target.u.user.name,
 					    XT_STANDARD_TARGET) == 0) &&
-				    t->verdict < -NF_MAX_VERDICT - 1) {
-					duprintf("mark_source_chains: bad "
-						"negative verdict (%i)\n",
-								t->verdict);
+				    t->verdict < -NF_MAX_VERDICT - 1)
 					return 0;
-				}
 
 				/* Return: backtrack through the last
 				 * big jump.
···
 					   XT_STANDARD_TARGET) == 0 &&
 				    newpos >= 0) {
 					/* This a jump; chase it. */
-					duprintf("Jump rule %u -> %u\n",
-						 pos, newpos);
 					e = (struct arpt_entry *)
 						(entry0 + newpos);
 					if (!find_jump_target(newinfo, e))
···
 				pos = newpos;
 			}
 		}
-next:
-		duprintf("Finished chain %u\n", hook);
+next:		;
 	}
 	return 1;
 }
···
 static inline int check_target(struct arpt_entry *e, const char *name)
 {
 	struct xt_entry_target *t = arpt_get_target(e);
-	int ret;
 	struct xt_tgchk_param par = {
 		.table     = name,
 		.entryinfo = e,
···
 		.family    = NFPROTO_ARP,
 	};
 
-	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
-	if (ret < 0) {
-		duprintf("arp_tables: check failed for `%s'.\n",
-			 t->u.kernel.target->name);
-		return ret;
-	}
-	return 0;
+	return xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
 }
 
 static inline int
···
 {
 	struct xt_entry_target *t;
 	struct xt_target *target;
+	unsigned long pcnt;
 	int ret;
 
-	e->counters.pcnt = xt_percpu_counter_alloc();
-	if (IS_ERR_VALUE(e->counters.pcnt))
+	pcnt = xt_percpu_counter_alloc();
+	if (IS_ERR_VALUE(pcnt))
 		return -ENOMEM;
+	e->counters.pcnt = pcnt;
 
 	t = arpt_get_target(e);
 	target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
 		ret = PTR_ERR(target);
 		goto out;
 	}
···
 
 	if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct arpt_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p\n", e);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset
-	    < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+	    < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!arp_checkentry(&e->arp))
 		return -EINVAL;
···
 		if ((unsigned char *)e - base == hook_entries[h])
 			newinfo->hook_entry[h] = hook_entries[h];
 		if ((unsigned char *)e - base == underflows[h]) {
-			if (!check_underflow(e)) {
-				pr_debug("Underflows must be unconditional and "
-					 "use the STANDARD target with "
-					 "ACCEPT/DROP\n");
+			if (!check_underflow(e))
 				return -EINVAL;
-			}
+
 			newinfo->underflow[h] = underflows[h];
 		}
 	}
···
 		newinfo->underflow[i] = 0xFFFFFFFF;
 	}
 
-	duprintf("translate_table: size %u\n", newinfo->size);
 	i = 0;
 
 	/* Walk through entries, checking offsets. */
···
 		    XT_ERROR_TARGET) == 0)
 			++newinfo->stacksize;
 	}
-	duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret);
 	if (ret != 0)
 		return ret;
 
-	if (i != repl->num_entries) {
-		duprintf("translate_table: %u not %u entries\n",
-			 i, repl->num_entries);
+	if (i != repl->num_entries)
 		return -EINVAL;
-	}
 
 	/* Check hooks all assigned */
 	for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
 		/* Only hooks which are valid */
 		if (!(repl->valid_hooks & (1 << i)))
 			continue;
-		if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
-			duprintf("Invalid hook entry %u %u\n",
-				 i, repl->hook_entry[i]);
+		if (newinfo->hook_entry[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
-		if (newinfo->underflow[i] == 0xFFFFFFFF) {
-			duprintf("Invalid underflow %u %u\n",
-				 i, repl->underflow[i]);
+		if (newinfo->underflow[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
 	}
 
 	if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
···
 	struct xt_table *t;
 	int ret;
 
-	if (*len != sizeof(struct arpt_getinfo)) {
-		duprintf("length %u != %Zu\n", *len,
-			 sizeof(struct arpt_getinfo));
+	if (*len != sizeof(struct arpt_getinfo))
 		return -EINVAL;
-	}
 
 	if (copy_from_user(name, user, sizeof(name)) != 0)
 		return -EFAULT;
···
 	struct arpt_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("get_entries: %u < %Zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
-	if (*len != sizeof(struct arpt_get_entries) + get.size) {
-		duprintf("get_entries: %u != %Zu\n", *len,
-			 sizeof(struct arpt_get_entries) + get.size);
+	if (*len != sizeof(struct arpt_get_entries) + get.size)
 		return -EINVAL;
-	}
+
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
 	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 
-		duprintf("t->private->number = %u\n",
-			 private->number);
 		if (get.size == private->size)
 			ret = copy_entries_to_user(private->size,
 						   t, uptr->entrytable);
-		else {
-			duprintf("get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		else
 			ret = -EAGAIN;
-		}
+
 		module_put(t->me);
 		xt_table_unlock(t);
 	} else
···
 
 	/* You lied! */
 	if (valid_hooks != t->valid_hooks) {
-		duprintf("Valid hook crap: %08X vs %08X\n",
-			 valid_hooks, t->valid_hooks);
 		ret = -EINVAL;
 		goto put_module;
 	}
···
 		goto put_module;
 
 	/* Update module usage count based on number of rules */
-	duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
-		oldinfo->number, oldinfo->initial_entries, newinfo->number);
 	if ((oldinfo->number > oldinfo->initial_entries) ||
 	    (newinfo->number <= oldinfo->initial_entries))
 		module_put(t->me);
···
 	ret = translate_table(newinfo, loc_cpu_entry, &tmp);
 	if (ret != 0)
 		goto free_newinfo;
-
-	duprintf("arp_tables: Translated table\n");
 
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, tmp.counters);
···
 	unsigned int entry_offset;
 	int ret, off;
 
-	duprintf("check_compat_entry_size_and_hooks %p\n", e);
 	if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p, limit = %p\n", e, limit);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset < sizeof(struct compat_arpt_entry) +
-			     sizeof(struct compat_xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+			     sizeof(struct compat_xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!arp_checkentry(&e->arp))
 		return -EINVAL;
···
 	target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
-			 t->u.user.name);
 		ret = PTR_ERR(target);
 		goto out;
 	}
···
 	size = compatr->size;
 	info->number = compatr->num_entries;
 
-	duprintf("translate_compat_table: size %u\n", info->size);
 	j = 0;
 	xt_compat_lock(NFPROTO_ARP);
 	xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries);
···
 	}
 
 	ret = -EINVAL;
-	if (j != compatr->num_entries) {
-		duprintf("translate_compat_table: %u not %u entries\n",
-			 j, compatr->num_entries);
+	if (j != compatr->num_entries)
 		goto out_unlock;
-	}
 
 	ret = -ENOMEM;
 	newinfo = xt_alloc_table_info(size);
···
 	if (ret != 0)
 		goto free_newinfo;
 
-	duprintf("compat_do_replace: Translated table\n");
-
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, compat_ptr(tmp.counters));
 	if (ret)
···
 		break;
 
 	default:
-		duprintf("do_arpt_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	struct compat_arpt_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
-	if (*len != sizeof(struct compat_arpt_get_entries) + get.size) {
-		duprintf("compat_get_entries: %u != %zu\n",
-			 *len, sizeof(get) + get.size);
+	if (*len != sizeof(struct compat_arpt_get_entries) + get.size)
 		return -EINVAL;
-	}
+
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	xt_compat_lock(NFPROTO_ARP);
···
 		const struct xt_table_info *private = t->private;
 		struct xt_table_info info;
 
-		duprintf("t->private->number = %u\n", private->number);
 		ret = compat_table_info(private, &info);
 		if (!ret && get.size == info.size) {
 			ret = compat_copy_entries_to_user(private->size,
 							  t, uptr->entrytable);
-		} else if (!ret) {
-			duprintf("compat_get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		} else if (!ret)
 			ret = -EAGAIN;
-		}
+
 		xt_compat_flush_offsets(NFPROTO_ARP);
 		module_put(t->me);
 		xt_table_unlock(t);
···
 		break;
 
 	default:
-		duprintf("do_arpt_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	}
 
 	default:
-		duprintf("do_arpt_get_ctl: unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	memcpy(loc_cpu_entry, repl->entries, repl->size);
 
 	ret = translate_table(newinfo, loc_cpu_entry, repl);
-	duprintf("arpt_register_table: translate table gives %d\n", ret);
 	if (ret != 0)
 		goto out_free;
 

net/ipv4/netfilter/ip_tables.c

···
 MODULE_AUTHOR("Netfilter Core Team <[e-mail]>");
 MODULE_DESCRIPTION("IPv4 packet filter");
 
-/*#define DEBUG_IP_FIREWALL*/
-/*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
-/*#define DEBUG_IP_FIREWALL_USER*/
-
-#ifdef DEBUG_IP_FIREWALL
-#define dprintf(format, args...) pr_info(format , ## args)
-#else
-#define dprintf(format, args...)
-#endif
-
-#ifdef DEBUG_IP_FIREWALL_USER
-#define duprintf(format, args...) pr_info(format , ## args)
-#else
-#define duprintf(format, args...)
-#endif
-
 #ifdef CONFIG_NETFILTER_DEBUG
 #define IP_NF_ASSERT(x)		WARN_ON(!(x))
 #else
 #define IP_NF_ASSERT(x)
-#endif
-
-#if 0
-/* All the better to debug you with... */
-#define static
-#define inline
 #endif
 
 void *ipt_alloc_initial_table(const struct xt_table *info)
···
 	if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
 		  IPT_INV_SRCIP) ||
 	    FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
-		  IPT_INV_DSTIP)) {
-		dprintf("Source or dest mismatch.\n");
-
-		dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
-			&ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr,
-			ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : "");
-		dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n",
-			&ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr,
-			ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : "");
+		  IPT_INV_DSTIP))
 		return false;
-	}
 
 	ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
 
-	if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
-		dprintf("VIA in mismatch (%s vs %s).%s\n",
-			indev, ipinfo->iniface,
-			ipinfo->invflags & IPT_INV_VIA_IN ? " (INV)" : "");
+	if (FWINV(ret != 0, IPT_INV_VIA_IN))
 		return false;
-	}
 
 	ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
 
-	if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
-		dprintf("VIA out mismatch (%s vs %s).%s\n",
-			outdev, ipinfo->outiface,
-			ipinfo->invflags & IPT_INV_VIA_OUT ? " (INV)" : "");
+	if (FWINV(ret != 0, IPT_INV_VIA_OUT))
 		return false;
-	}
 
 	/* Check specific protocol */
 	if (ipinfo->proto &&
-	    FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) {
-		dprintf("Packet protocol %hi does not match %hi.%s\n",
-			ip->protocol, ipinfo->proto,
-			ipinfo->invflags & IPT_INV_PROTO ? " (INV)" : "");
+	    FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO))
 		return false;
-	}
 
 	/* If we have a fragment rule but the packet is not a fragment
 	 * then we return zero */
-	if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) {
-		dprintf("Fragment rule but not fragment.%s\n",
-			ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : "");
+	if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG))
 		return false;
-	}
 
 	return true;
 }
···
 static bool
 ip_checkentry(const struct ipt_ip *ip)
 {
-	if (ip->flags & ~IPT_F_MASK) {
-		duprintf("Unknown flag bits set: %08X\n",
-			 ip->flags & ~IPT_F_MASK);
+	if (ip->flags & ~IPT_F_MASK)
 		return false;
-	}
-	if (ip->invflags & ~IPT_INV_MASK) {
-		duprintf("Unknown invflag bits set: %08X\n",
-			 ip->invflags & ~IPT_INV_MASK);
+	if (ip->invflags & ~IPT_INV_MASK)
 		return false;
-	}
 	return true;
 }
 
···
 
 	e = get_entry(table_base, private->hook_entry[hook]);
 
-	pr_debug("Entering %s(hook %u), UF %p\n",
-		 table->name, hook,
-		 get_entry(table_base, private->underflow[hook]));
-
 	do {
 		const struct xt_entry_target *t;
 		const struct xt_entry_match *ematch;
···
 				if (stackidx == 0) {
 					e = get_entry(table_base,
 					    private->underflow[hook]);
-					pr_debug("Underflow (this is normal) "
-						 "to %p\n", e);
 				} else {
 					e = jumpstack[--stackidx];
-					pr_debug("Pulled %p out from pos %u\n",
-						 e, stackidx);
 					e = ipt_next_entry(e);
 				}
 				continue;
 			}
 			if (table_base + v != ipt_next_entry(e) &&
-			    !(e->ip.flags & IPT_F_GOTO)) {
+			    !(e->ip.flags & IPT_F_GOTO))
 				jumpstack[stackidx++] = e;
-				pr_debug("Pushed %p into pos %u\n",
-					 e, stackidx - 1);
-			}
 
 			e = get_entry(table_base, v);
 			continue;
···
 			/* Verdict */
 			break;
 	} while (!acpar.hotdrop);
-	pr_debug("Exiting %s; sp at %u\n", __func__, stackidx);
 
 	xt_write_recseq_end(addend);
 	local_bh_enable();
 
-#ifdef DEBUG_ALLOW_ALL
-	return NF_ACCEPT;
-#else
 	if (acpar.hotdrop)
 		return NF_DROP;
 	else return verdict;
-#endif
 }
 
 static bool find_jump_target(const struct xt_table_info *t,
···
 				= (void *)ipt_get_target_c(e);
 			int visited = e->comefrom & (1 << hook);
 
-			if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
-				pr_err("iptables: loop hook %u pos %u %08X.\n",
-				       hook, pos, e->comefrom);
+			if (e->comefrom & (1 << NF_INET_NUMHOOKS))
 				return 0;
-			}
+
 			e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
 
 			/* Unconditional return/END. */
···
 
 				if ((strcmp(t->target.u.user.name,
 					    XT_STANDARD_TARGET) == 0) &&
-				    t->verdict < -NF_MAX_VERDICT - 1) {
-					duprintf("mark_source_chains: bad "
-						"negative verdict (%i)\n",
-								t->verdict);
+				    t->verdict < -NF_MAX_VERDICT - 1)
 					return 0;
-				}
 
 				/* Return: backtrack through the last
 				   big jump. */
 				do {
 					e->comefrom ^= (1<<NF_INET_NUMHOOKS);
-#ifdef DEBUG_IP_FIREWALL_USER
-					if (e->comefrom
-					    & (1 << NF_INET_NUMHOOKS)) {
-						duprintf("Back unset "
-							 "on hook %u "
-							 "rule %u\n",
-							 hook, pos);
-					}
-#endif
 					oldpos = pos;
 					pos = e->counters.pcnt;
 					e->counters.pcnt = 0;
···
 					   XT_STANDARD_TARGET) == 0 &&
 				    newpos >= 0) {
 					/* This a jump; chase it. */
-					duprintf("Jump rule %u -> %u\n",
-						 pos, newpos);
 					e = (struct ipt_entry *)
 						(entry0 + newpos);
 					if (!find_jump_target(newinfo, e))
···
 				pos = newpos;
 			}
 		}
-next:
-		duprintf("Finished chain %u\n", hook);
+next:		;
 	}
 	return 1;
 }
···
 check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
 {
 	const struct ipt_ip *ip = par->entryinfo;
-	int ret;
 
 	par->match     = m->u.kernel.match;
 	par->matchinfo = m->data;
 
-	ret = xt_check_match(par, m->u.match_size - sizeof(*m),
-	      ip->proto, ip->invflags & IPT_INV_PROTO);
-	if (ret < 0) {
-		duprintf("check failed for `%s'.\n", par->match->name);
-		return ret;
-	}
-	return 0;
+	return xt_check_match(par, m->u.match_size - sizeof(*m),
+			      ip->proto, ip->invflags & IPT_INV_PROTO);
 }
 
 static int
···
 
 	match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
 				      m->u.user.revision);
-	if (IS_ERR(match)) {
-		duprintf("find_check_match: `%s' not found\n", m->u.user.name);
+	if (IS_ERR(match))
 		return PTR_ERR(match);
-	}
 	m->u.kernel.match = match;
 
 	ret = check_match(m, par);
···
 		.hook_mask = e->comefrom,
 		.family    = NFPROTO_IPV4,
 	};
-	int ret;
 
-	ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
-	      e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
-	if (ret < 0) {
-		duprintf("check failed for `%s'.\n",
-			 t->u.kernel.target->name);
-		return ret;
-	}
-	return 0;
+	return xt_check_target(&par, t->u.target_size - sizeof(*t),
+			       e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
 }
 
 static int
···
 	unsigned int j;
 	struct xt_mtchk_param mtpar;
 	struct xt_entry_match *ematch;
+	unsigned long pcnt;
 
-	e->counters.pcnt = xt_percpu_counter_alloc();
-	if (IS_ERR_VALUE(e->counters.pcnt))
+	pcnt = xt_percpu_counter_alloc();
+	if (IS_ERR_VALUE(pcnt))
 		return -ENOMEM;
+	e->counters.pcnt = pcnt;
 
 	j = 0;
 	mtpar.net	= net;
···
 	target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
 		ret = PTR_ERR(target);
 		goto cleanup_matches;
 	}
···
 
 	if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct ipt_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p\n", e);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset
-	    < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+	    < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!ip_checkentry(&e->ip))
 		return -EINVAL;
···
 		if ((unsigned char *)e - base == hook_entries[h])
 			newinfo->hook_entry[h] = hook_entries[h];
 		if ((unsigned char *)e - base == underflows[h]) {
-			if (!check_underflow(e)) {
-				pr_debug("Underflows must be unconditional and "
-					 "use the STANDARD target with "
-					 "ACCEPT/DROP\n");
+			if (!check_underflow(e))
 				return -EINVAL;
-			}
+
 			newinfo->underflow[h] = underflows[h];
 		}
 	}
···
 		newinfo->underflow[i] = 0xFFFFFFFF;
 	}
 
-	duprintf("translate_table: size %u\n", newinfo->size);
 	i = 0;
 	/* Walk through entries, checking offsets. */
 	xt_entry_foreach(iter, entry0, newinfo->size) {
···
 			++newinfo->stacksize;
 	}
 
-	if (i != repl->num_entries) {
-		duprintf("translate_table: %u not %u entries\n",
-			 i, repl->num_entries);
+	if (i != repl->num_entries)
 		return -EINVAL;
-	}
 
 	/* Check hooks all assigned */
 	for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 		/* Only hooks which are valid */
 		if (!(repl->valid_hooks & (1 << i)))
 			continue;
-		if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
-			duprintf("Invalid hook entry %u %u\n",
-				 i, repl->hook_entry[i]);
+		if (newinfo->hook_entry[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
-		if (newinfo->underflow[i] == 0xFFFFFFFF) {
-			duprintf("Invalid underflow %u %u\n",
-				 i, repl->underflow[i]);
+		if (newinfo->underflow[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
 	}
 
 	if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
···
 	struct xt_table *t;
 	int ret;
 
-	if (*len != sizeof(struct ipt_getinfo)) {
-		duprintf("length %u != %zu\n", *len,
-			 sizeof(struct ipt_getinfo));
+	if (*len != sizeof(struct ipt_getinfo))
 		return -EINVAL;
-	}
 
 	if (copy_from_user(name, user, sizeof(name)) != 0)
 		return -EFAULT;
···
 	struct ipt_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
-	if (*len != sizeof(struct ipt_get_entries) + get.size) {
-		duprintf("get_entries: %u != %zu\n",
-			 *len, sizeof(get) + get.size);
+	if (*len != sizeof(struct ipt_get_entries) + get.size)
 		return -EINVAL;
-	}
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	t = xt_find_table_lock(net, AF_INET, get.name);
 	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
-		duprintf("t->private->number = %u\n", private->number);
 		if (get.size == private->size)
 			ret = copy_entries_to_user(private->size,
 						   t, uptr->entrytable);
-		else {
-			duprintf("get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		else
 			ret = -EAGAIN;
-		}
+
 		module_put(t->me);
 		xt_table_unlock(t);
 	} else
···
 
 	/* You lied! */
 	if (valid_hooks != t->valid_hooks) {
-		duprintf("Valid hook crap: %08X vs %08X\n",
-			 valid_hooks, t->valid_hooks);
 		ret = -EINVAL;
 		goto put_module;
 	}
···
 		goto put_module;
 
 	/* Update module usage count based on number of rules */
-	duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
-		oldinfo->number, oldinfo->initial_entries, newinfo->number);
 	if ((oldinfo->number > oldinfo->initial_entries) ||
 	    (newinfo->number <= oldinfo->initial_entries))
 		module_put(t->me);
···
 	ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
 	if (ret != 0)
 		goto free_newinfo;
-
-	duprintf("Translated table\n");
 
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, tmp.counters);
···
 
 	match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
 				      m->u.user.revision);
-	if (IS_ERR(match)) {
-		duprintf("compat_check_calc_match: `%s' not found\n",
-			 m->u.user.name);
+	if (IS_ERR(match))
 		return PTR_ERR(match);
-	}
+
 	m->u.kernel.match = match;
 	*size += xt_compat_match_offset(match);
 	return 0;
···
 	unsigned int j;
 	int ret, off;
 
-	duprintf("check_compat_entry_size_and_hooks %p\n", e);
 	if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p, limit = %p\n", e, limit);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset < sizeof(struct compat_ipt_entry) +
-			     sizeof(struct compat_xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+			     sizeof(struct compat_xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!ip_checkentry(&e->ip))
 		return -EINVAL;
···
 	target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
-			 t->u.user.name);
 		ret = PTR_ERR(target);
 		goto release_matches;
 	}
···
 	size = compatr->size;
 	info->number = compatr->num_entries;
 
-	duprintf("translate_compat_table: size %u\n", info->size);
 	j = 0;
 	xt_compat_lock(AF_INET);
 	xt_compat_init_offsets(AF_INET, compatr->num_entries);
···
 	}
 
 	ret = -EINVAL;
-	if (j != compatr->num_entries) {
-		duprintf("translate_compat_table: %u not %u entries\n",
-			 j, compatr->num_entries);
+	if (j != compatr->num_entries)
 		goto out_unlock;
-	}
 
 	ret = -ENOMEM;
 	newinfo = xt_alloc_table_info(size);
···
 	if (ret != 0)
 		goto free_newinfo;
 
-	duprintf("compat_do_replace: Translated table\n");
-
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, compat_ptr(tmp.counters));
 	if (ret)
···
 		break;
 
 	default:
-		duprintf("do_ipt_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	struct compat_ipt_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
 
-	if (*len != sizeof(struct compat_ipt_get_entries) + get.size) {
-		duprintf("compat_get_entries: %u != %zu\n",
-			 *len, sizeof(get) + get.size);
+	if (*len != sizeof(struct compat_ipt_get_entries) + get.size)
 		return -EINVAL;
-	}
+
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	xt_compat_lock(AF_INET);
···
 	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 		struct xt_table_info info;
-		duprintf("t->private->number = %u\n", private->number);
 		ret = compat_table_info(private, &info);
-		if (!ret && get.size == info.size) {
+		if (!ret && get.size == info.size)
 			ret = compat_copy_entries_to_user(private->size,
 							  t, uptr->entrytable);
-		} else if (!ret) {
-			duprintf("compat_get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		else if (!ret)
 			ret = -EAGAIN;
-		}
+
 		xt_compat_flush_offsets(AF_INET);
 		module_put(t->me);
 		xt_table_unlock(t);
···
 		break;
 
 	default:
-		duprintf("do_ipt_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	}
 
 	default:
-		duprintf("do_ipt_get_ctl: unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 		/* We've been asked to examine this packet, and we
 		 * can't.  Hence, no choice but to drop.
 		 */
-		duprintf("Dropping evil ICMP tinygram.\n");
 		par->hotdrop = true;
 		return false;
 	}

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

···
 
 	in->ctl_table[0].data = &nf_conntrack_max;
 	in->ctl_table[1].data = &net->ct.count;
-	in->ctl_table[2].data = &net->ct.htable_size;
+	in->ctl_table[2].data = &nf_conntrack_htable_size;
 	in->ctl_table[3].data = &net->ct.sysctl_checksum;
 	in->ctl_table[4].data = &net->ct.sysctl_log_invalid;
 #endif

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c

···
 
 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 	struct hlist_nulls_node *n;
 
 	for (st->bucket = 0;
-	     st->bucket < net->ct.htable_size;
+	     st->bucket < nf_conntrack_htable_size;
 	     st->bucket++) {
 		n = rcu_dereference(
-			hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
+			hlist_nulls_first_rcu(&nf_conntrack_hash[st->bucket]));
 		if (!is_a_nulls(n))
 			return n;
 	}
···
 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 				      struct hlist_nulls_node *head)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 
 	head = rcu_dereference(hlist_nulls_next_rcu(head));
 	while (is_a_nulls(head)) {
 		if (likely(get_nulls_value(head) == st->bucket)) {
-			if (++st->bucket >= net->ct.htable_size)
+			if (++st->bucket >= nf_conntrack_htable_size)
 				return NULL;
 		}
 		head = rcu_dereference(
-			hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
+			hlist_nulls_first_rcu(&nf_conntrack_hash[st->bucket]));
 	}
 	return head;
 }
···
 }
 #endif
 
+static bool ct_seq_should_skip(const struct nf_conn *ct,
+			       const struct net *net,
+			       const struct nf_conntrack_tuple_hash *hash)
+{
+	/* we only want to print DIR_ORIGINAL */
+	if (NF_CT_DIRECTION(hash))
+		return true;
+
+	if (nf_ct_l3num(ct) != AF_INET)
+		return true;
+
+	if (!net_eq(nf_ct_net(ct), net))
+		return true;
+
+	return false;
+}
+
 static int ct_seq_show(struct seq_file *s, void *v)
 {
 	struct nf_conntrack_tuple_hash *hash = v;
···
 	int ret = 0;
 
 	NF_CT_ASSERT(ct);
+	if (ct_seq_should_skip(ct, seq_file_net(s), hash))
+		return 0;
+
 	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 		return 0;
 
-
-	/* we only want to print DIR_ORIGINAL */
-	if (NF_CT_DIRECTION(hash))
-		goto release;
-	if (nf_ct_l3num(ct) != AF_INET)
+	/* check if we raced w. object reuse */
+	if (!nf_ct_is_confirmed(ct) ||
+	    ct_seq_should_skip(ct, seq_file_net(s), hash))
 		goto release;
 
 	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
···
 
 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_expect_iter_state *st = seq->private;
 	struct hlist_node *n;
 
 	for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 		n = rcu_dereference(
-			hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
+			hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
 		if (n)
 			return n;
 	}
···
 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 					     struct hlist_node *head)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_expect_iter_state *st = seq->private;
 
 	head = rcu_dereference(hlist_next_rcu(head));
···
 		if (++st->bucket >= nf_ct_expect_hsize)
 			return NULL;
 		head = rcu_dereference(
-			hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
+			hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
 	}
 	return head;
 }
···
 	const struct hlist_node *n = v;
 
 	exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
+
+	if (!net_eq(nf_ct_net(exp->master), seq_file_net(s)))
+		return 0;
 
 	if (exp->tuple.src.l3num != AF_INET)
 		return 0;

net/ipv6/netfilter/ip6_tables.c

···
 MODULE_AUTHOR("Netfilter Core Team <[e-mail]>");
 MODULE_DESCRIPTION("IPv6 packet filter");
 
-/*#define DEBUG_IP_FIREWALL*/
-/*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
-/*#define DEBUG_IP_FIREWALL_USER*/
-
-#ifdef DEBUG_IP_FIREWALL
-#define dprintf(format, args...) pr_info(format , ## args)
-#else
-#define dprintf(format, args...)
-#endif
-
-#ifdef DEBUG_IP_FIREWALL_USER
-#define duprintf(format, args...) pr_info(format , ## args)
-#else
-#define duprintf(format, args...)
-#endif
-
 #ifdef CONFIG_NETFILTER_DEBUG
 #define IP_NF_ASSERT(x)	WARN_ON(!(x))
 #else
 #define IP_NF_ASSERT(x)
-#endif
-
-#if 0
-/* All the better to debug you with... */
-#define static
-#define inline
 #endif
 
 void *ip6t_alloc_initial_table(const struct xt_table *info)
···
 	if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
 				       &ip6info->src), IP6T_INV_SRCIP) ||
 	    FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
-				       &ip6info->dst), IP6T_INV_DSTIP)) {
-		dprintf("Source or dest mismatch.\n");
-/*
-		dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
-			ipinfo->smsk.s_addr, ipinfo->src.s_addr,
-			ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
-		dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
-			ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
-			ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
+				       &ip6info->dst), IP6T_INV_DSTIP))
 		return false;
-	}
 
 	ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
 
-	if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
-		dprintf("VIA in mismatch (%s vs %s).%s\n",
-			indev, ip6info->iniface,
-			ip6info->invflags & IP6T_INV_VIA_IN ? " (INV)" : "");
+	if (FWINV(ret != 0, IP6T_INV_VIA_IN))
 		return false;
-	}
 
 	ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
 
-	if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
-		dprintf("VIA out mismatch (%s vs %s).%s\n",
-			outdev, ip6info->outiface,
-			ip6info->invflags & IP6T_INV_VIA_OUT ? " (INV)" : "");
+	if (FWINV(ret != 0, IP6T_INV_VIA_OUT))
 		return false;
-	}
 
 /* ... might want to do something with class and flowlabel here ... */
 
···
 			return false;
 		}
 		*fragoff = _frag_off;
-
-		dprintf("Packet protocol %hi ?= %s%hi.\n",
-				protohdr,
-				ip6info->invflags & IP6T_INV_PROTO ? "!":"",
-				ip6info->proto);
 
 		if (ip6info->proto == protohdr) {
 			if (ip6info->invflags & IP6T_INV_PROTO)
···
 static bool
 ip6_checkentry(const struct ip6t_ip6 *ipv6)
 {
-	if (ipv6->flags & ~IP6T_F_MASK) {
-		duprintf("Unknown flag bits set: %08X\n",
-			 ipv6->flags & ~IP6T_F_MASK);
+	if (ipv6->flags & ~IP6T_F_MASK)
 		return false;
-	}
-	if (ipv6->invflags & ~IP6T_INV_MASK) {
-		duprintf("Unknown invflag bits set: %08X\n",
-			 ipv6->invflags & ~IP6T_INV_MASK);
+	if (ipv6->invflags & ~IP6T_INV_MASK)
 		return false;
-	}
+
 	return true;
 }
 
···
 	xt_write_recseq_end(addend);
 	local_bh_enable();
 
-#ifdef DEBUG_ALLOW_ALL
-	return NF_ACCEPT;
-#else
 	if (acpar.hotdrop)
 		return NF_DROP;
 	else return verdict;
-#endif
 }
 
 static bool find_jump_target(const struct xt_table_info *t,
···
 				= (void *)ip6t_get_target_c(e);
 			int visited = e->comefrom & (1 << hook);
 
-			if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
-				pr_err("iptables: loop hook %u pos %u %08X.\n",
-				       hook, pos, e->comefrom);
+			if (e->comefrom & (1 << NF_INET_NUMHOOKS))
 				return 0;
-			}
+
 			e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
 
 			/* Unconditional return/END. */
···
 
 				if ((strcmp(t->target.u.user.name,
 					    XT_STANDARD_TARGET) == 0) &&
-				    t->verdict < -NF_MAX_VERDICT - 1) {
-					duprintf("mark_source_chains: bad "
-						"negative verdict (%i)\n",
-								t->verdict);
+				    t->verdict < -NF_MAX_VERDICT - 1)
 					return 0;
-				}
 
 				/* Return: backtrack through the last
 				   big jump. */
 				do {
 					e->comefrom ^= (1<<NF_INET_NUMHOOKS);
-#ifdef DEBUG_IP_FIREWALL_USER
-					if (e->comefrom
-					    & (1 << NF_INET_NUMHOOKS)) {
-						duprintf("Back unset "
-							 "on hook %u "
-							 "rule %u\n",
-							 hook, pos);
-					}
-#endif
 					oldpos = pos;
 					pos = e->counters.pcnt;
 					e->counters.pcnt = 0;
···
 					   XT_STANDARD_TARGET) == 0 &&
 				    newpos >= 0) {
 					/* This a jump; chase it. */
-					duprintf("Jump rule %u -> %u\n",
-						 pos, newpos);
 					e = (struct ip6t_entry *)
 						(entry0 + newpos);
 					if (!find_jump_target(newinfo, e))
···
 				pos = newpos;
 			}
 		}
-next:
-		duprintf("Finished chain %u\n", hook);
+next:		;
 	}
 	return 1;
 }
···
 static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
 {
 	const struct ip6t_ip6 *ipv6 = par->entryinfo;
-	int ret;
 
 	par->match     = m->u.kernel.match;
 	par->matchinfo = m->data;
 
-	ret = xt_check_match(par, m->u.match_size - sizeof(*m),
-			     ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
-	if (ret < 0) {
-		duprintf("ip_tables: check failed for `%s'.\n",
-			 par.match->name);
-		return ret;
-	}
-	return 0;
+	return xt_check_match(par, m->u.match_size - sizeof(*m),
+			      ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
 }
 
 static int
···
 
 	match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
 				      m->u.user.revision);
-	if (IS_ERR(match)) {
-		duprintf("find_check_match: `%s' not found\n", m->u.user.name);
+	if (IS_ERR(match))
 		return PTR_ERR(match);
-	}
+
 	m->u.kernel.match = match;
 
 	ret = check_match(m, par);
···
 		.hook_mask = e->comefrom,
 		.family    = NFPROTO_IPV6,
 	};
-	int ret;
 
 	t = ip6t_get_target(e);
-	ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
-	      e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO);
-	if (ret < 0) {
-		duprintf("ip_tables: check failed for `%s'.\n",
-			 t->u.kernel.target->name);
-		return ret;
-	}
-	return 0;
+	return xt_check_target(&par, t->u.target_size - sizeof(*t),
+			       e->ipv6.proto,
+			       e->ipv6.invflags & IP6T_INV_PROTO);
 }
 
 static int
···
 	unsigned int j;
 	struct xt_mtchk_param mtpar;
 	struct xt_entry_match *ematch;
+	unsigned long pcnt;
 
-	e->counters.pcnt = xt_percpu_counter_alloc();
-	if (IS_ERR_VALUE(e->counters.pcnt))
+	pcnt = xt_percpu_counter_alloc();
+	if (IS_ERR_VALUE(pcnt))
 		return -ENOMEM;
+	e->counters.pcnt = pcnt;
 
 	j = 0;
 	mtpar.net	= net;
···
 	target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
 		ret = PTR_ERR(target);
 		goto cleanup_matches;
 	}
···
 
 	if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p\n", e);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset
-	    < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+	    < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!ip6_checkentry(&e->ipv6))
 		return -EINVAL;
···
 		if ((unsigned char *)e - base == hook_entries[h])
 			newinfo->hook_entry[h] = hook_entries[h];
 		if ((unsigned char *)e - base == underflows[h]) {
-			if (!check_underflow(e)) {
-				pr_debug("Underflows must be unconditional and "
-					 "use the STANDARD target with "
-					 "ACCEPT/DROP\n");
+			if (!check_underflow(e))
 				return -EINVAL;
-			}
+
 			newinfo->underflow[h] = underflows[h];
 		}
 	}
···
 		newinfo->underflow[i] = 0xFFFFFFFF;
 	}
 
-	duprintf("translate_table: size %u\n", newinfo->size);
 	i = 0;
 	/* Walk through entries, checking offsets. */
 	xt_entry_foreach(iter, entry0, newinfo->size) {
···
 			++newinfo->stacksize;
 	}
 
-	if (i != repl->num_entries) {
-		duprintf("translate_table: %u not %u entries\n",
-			 i, repl->num_entries);
+	if (i != repl->num_entries)
 		return -EINVAL;
-	}
 
 	/* Check hooks all assigned */
 	for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 		/* Only hooks which are valid */
 		if (!(repl->valid_hooks & (1 << i)))
 			continue;
-		if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
-			duprintf("Invalid hook entry %u %u\n",
-				 i, repl->hook_entry[i]);
+		if (newinfo->hook_entry[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
-		if (newinfo->underflow[i] == 0xFFFFFFFF) {
-			duprintf("Invalid underflow %u %u\n",
-				 i, repl->underflow[i]);
+		if (newinfo->underflow[i] == 0xFFFFFFFF)
 			return -EINVAL;
-		}
 	}
 
 	if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
···
 	struct xt_table *t;
 	int ret;
 
-	if (*len != sizeof(struct ip6t_getinfo)) {
-		duprintf("length %u != %zu\n", *len,
-			 sizeof(struct ip6t_getinfo));
+	if (*len != sizeof(struct ip6t_getinfo))
 		return -EINVAL;
-	}
 
 	if (copy_from_user(name, user, sizeof(name)) != 0)
 		return -EFAULT;
···
 	struct ip6t_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
-	if (*len != sizeof(struct ip6t_get_entries) + get.size) {
-		duprintf("get_entries: %u != %zu\n",
-			 *len, sizeof(get) + get.size);
+	if (*len != sizeof(struct ip6t_get_entries) + get.size)
 		return -EINVAL;
-	}
+
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	t = xt_find_table_lock(net, AF_INET6, get.name);
 	if (!IS_ERR_OR_NULL(t)) {
 		struct xt_table_info *private = t->private;
-		duprintf("t->private->number = %u\n", private->number);
 		if (get.size == private->size)
 			ret = copy_entries_to_user(private->size,
 						   t, uptr->entrytable);
-		else {
-			duprintf("get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		else
 			ret = -EAGAIN;
-		}
+
 		module_put(t->me);
 		xt_table_unlock(t);
 	} else
···
 
 	/* You lied! */
 	if (valid_hooks != t->valid_hooks) {
-		duprintf("Valid hook crap: %08X vs %08X\n",
-			 valid_hooks, t->valid_hooks);
 		ret = -EINVAL;
 		goto put_module;
 	}
···
 		goto put_module;
 
 	/* Update module usage count based on number of rules */
-	duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
-		oldinfo->number, oldinfo->initial_entries, newinfo->number);
 	if ((oldinfo->number > oldinfo->initial_entries) ||
 	    (newinfo->number <= oldinfo->initial_entries))
 		module_put(t->me);
···
 	ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
 	if (ret != 0)
 		goto free_newinfo;
-
-	duprintf("ip_tables: Translated table\n");
 
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, tmp.counters);
···
 
 	match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
 				      m->u.user.revision);
-	if (IS_ERR(match)) {
-		duprintf("compat_check_calc_match: `%s' not found\n",
-			 m->u.user.name);
+	if (IS_ERR(match))
 		return PTR_ERR(match);
-	}
+
 	m->u.kernel.match = match;
 	*size += xt_compat_match_offset(match);
 	return 0;
···
 	unsigned int j;
 	int ret, off;
 
-	duprintf("check_compat_entry_size_and_hooks %p\n", e);
 	if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
 	    (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
-	    (unsigned char *)e + e->next_offset > limit) {
-		duprintf("Bad offset %p, limit = %p\n", e, limit);
+	    (unsigned char *)e + e->next_offset > limit)
 		return -EINVAL;
-	}
 
 	if (e->next_offset < sizeof(struct compat_ip6t_entry) +
-			     sizeof(struct compat_xt_entry_target)) {
-		duprintf("checking: element %p size %u\n",
-			 e, e->next_offset);
+			     sizeof(struct compat_xt_entry_target))
 		return -EINVAL;
-	}
 
 	if (!ip6_checkentry(&e->ipv6))
 		return -EINVAL;
···
 	target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
 					t->u.user.revision);
 	if (IS_ERR(target)) {
-		duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
-			 t->u.user.name);
 		ret = PTR_ERR(target);
 		goto release_matches;
 	}
···
 	size = compatr->size;
 	info->number = compatr->num_entries;
 
-	duprintf("translate_compat_table: size %u\n", info->size);
 	j = 0;
 	xt_compat_lock(AF_INET6);
 	xt_compat_init_offsets(AF_INET6, compatr->num_entries);
···
 	}
 
 	ret = -EINVAL;
-	if (j != compatr->num_entries) {
-		duprintf("translate_compat_table: %u not %u entries\n",
-			 j, compatr->num_entries);
+	if (j != compatr->num_entries)
 		goto out_unlock;
-	}
 
 	ret = -ENOMEM;
 	newinfo = xt_alloc_table_info(size);
···
 	if (ret != 0)
 		goto free_newinfo;
 
-	duprintf("compat_do_replace: Translated table\n");
-
 	ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
 			   tmp.num_counters, compat_ptr(tmp.counters));
 	if (ret)
···
 		break;
 
 	default:
-		duprintf("do_ip6t_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	struct compat_ip6t_get_entries get;
 	struct xt_table *t;
 
-	if (*len < sizeof(get)) {
-		duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
+	if (*len < sizeof(get))
 		return -EINVAL;
-	}
 
 	if (copy_from_user(&get, uptr, sizeof(get)) != 0)
 		return -EFAULT;
 
-	if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) {
-		duprintf("compat_get_entries: %u != %zu\n",
-			 *len, sizeof(get) + get.size);
+	if (*len != sizeof(struct compat_ip6t_get_entries) + get.size)
 		return -EINVAL;
-	}
+
 	get.name[sizeof(get.name) - 1] = '\0';
 
 	xt_compat_lock(AF_INET6);
···
 	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 		struct xt_table_info info;
-		duprintf("t->private->number = %u\n", private->number);
 		ret = compat_table_info(private, &info);
-		if (!ret && get.size == info.size) {
+		if (!ret && get.size == info.size)
 			ret = compat_copy_entries_to_user(private->size,
 							  t, uptr->entrytable);
-		} else if (!ret) {
-			duprintf("compat_get_entries: I've got %u not %u!\n",
-				 private->size, get.size);
+		else if (!ret)
 			ret = -EAGAIN;
-		}
+
 		xt_compat_flush_offsets(AF_INET6);
 		module_put(t->me);
 		xt_table_unlock(t);
···
 		break;
 
 	default:
-		duprintf("do_ip6t_set_ctl:  unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 	}
 
 	default:
-		duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
 		ret = -EINVAL;
 	}
 
···
 		/* We've been asked to examine this packet, and we
 		 * can't.  Hence, no choice but to drop.
 		 */
-		duprintf("Dropping evil ICMP tinygram.\n");
 		par->hotdrop = true;
 		return false;
 	}

net/ipv6/netfilter/ip6t_SYNPROXY.c

···
 	fl6.fl6_dport = nth->dest;
 	security_skb_classify_flow((struct sk_buff *)skb, flowi6_to_flowi(&fl6));
 	dst = ip6_route_output(net, NULL, &fl6);
-	if (dst == NULL || dst->error) {
+	if (dst->error) {
 		dst_release(dst);
 		goto free_nskb;
 	}

net/netfilter/ipvs/ip_vs_conn.c

···
 	spin_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
 }
 
+static void ip_vs_conn_expire(unsigned long data);
 
 /*
  *	Returns hash value for IPVS connection entry
···
 }
 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
 
+static void __ip_vs_conn_put_notimer(struct ip_vs_conn *cp)
+{
+	__ip_vs_conn_put(cp);
+	ip_vs_conn_expire((unsigned long)cp);
+}
+
 /*
  *      Put back the conn and restart its timer with its timeout
  */
-void ip_vs_conn_put(struct ip_vs_conn *cp)
+static void __ip_vs_conn_put_timer(struct ip_vs_conn *cp)
 {
 	unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
 		0 : cp->timeout;
···
 	__ip_vs_conn_put(cp);
 }
 
+void ip_vs_conn_put(struct ip_vs_conn *cp)
+{
+	if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) &&
+	    (atomic_read(&cp->refcnt) == 1) &&
+	    !timer_pending(&cp->timer))
+		/* expire connection immediately */
+		__ip_vs_conn_put_notimer(cp);
+	else
+		__ip_vs_conn_put_timer(cp);
+}
 
 /*
  *	Fill a no_client_port connection with a client port number
···
 		if (cp->control)
 			ip_vs_control_del(cp);
 
-		if (cp->flags & IP_VS_CONN_F_NFCT) {
+		if ((cp->flags & IP_VS_CONN_F_NFCT) &&
+		    !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) {
 			/* Do not access conntracks during subsys cleanup
 			 * because nf_conntrack_find_get can not be used after
 			 * conntrack cleanup for the net.
···
 		ip_vs_unbind_dest(cp);
 		if (cp->flags & IP_VS_CONN_F_NO_CPORT)
 			atomic_dec(&ip_vs_conn_no_cport_cnt);
-		call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free);
+		if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
+			ip_vs_conn_rcu_free(&cp->rcu_head);
+		else
+			call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free);
 		atomic_dec(&ipvs->conn_count);
 		return;
 	}
···
 	if (ipvs->sync_state & IP_VS_STATE_MASTER)
 		ip_vs_sync_conn(ipvs, cp, sysctl_sync_threshold(ipvs));
 
-	ip_vs_conn_put(cp);
+	__ip_vs_conn_put_timer(cp);
 }
 
 /* Modify timer, so that it expires as soon as possible.
···
 	return 1;
 }
 
+static inline bool ip_vs_conn_ops_mode(struct ip_vs_conn *cp)
+{
+	struct ip_vs_service *svc;
+
+	if (!cp->dest)
+		return false;
+	svc = rcu_dereference(cp->dest->svc);
+	return svc && (svc->flags & IP_VS_SVC_F_ONEPACKET);
+}
+
 /* Called from keventd and must protect itself from softirqs */
 void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
 {
···
 		unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask;
 
 		hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
-			if (cp->flags & IP_VS_CONN_F_TEMPLATE)
-				/* connection template */
-				continue;
 			if (cp->ipvs != ipvs)
 				continue;
+			if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
+				if (atomic_read(&cp->n_control) ||
+				    !ip_vs_conn_ops_mode(cp))
+					continue;
+				else
+					/* connection template of OPS */
+					goto try_drop;
+			}
 			if (cp->protocol == IPPROTO_TCP) {
 				switch(cp->state) {
 				case IP_VS_TCP_S_SYN_RECV:
···
 					continue;
 				}
 			} else {
+try_drop:
 				if (!todrop_entry(cp))
 					continue;
 			}

net/netfilter/ipvs/ip_vs_core.c

···
 #ifdef CONFIG_IP_VS_DEBUG
 EXPORT_SYMBOL(ip_vs_get_debug_level);
 #endif
+EXPORT_SYMBOL(ip_vs_new_conn_out);
 
 static int ip_vs_net_id __read_mostly;
 /* netns cnt used for uniqueness */
···
 		ret = cp->packet_xmit(skb, cp, pd->pp, iph);
 		/* do not touch skb anymore */
 
-		atomic_inc(&cp->in_pkts);
+		if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
+			atomic_inc(&cp->control->in_pkts);
+		else
+			atomic_inc(&cp->in_pkts);
 		ip_vs_conn_put(cp);
 		return ret;
 	}
···
 	}
 }
 
+/* Generic function to create new connections for outgoing RS packets
+ *
+ * Pre-requisites for successful connection creation:
+ * 1) Virtual Service is NOT fwmark based:
+ *    In fwmark-VS actual vaddr and vport are unknown to IPVS
+ * 2) Real Server and Virtual Service were NOT configured without port:
+ *    This is to allow match of different VS to the same RS ip-addr
+ */
+struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
+				      struct ip_vs_dest *dest,
+				      struct sk_buff *skb,
+				      const struct ip_vs_iphdr *iph,
+				      __be16 dport,
+				      __be16 cport)
+{
+	struct ip_vs_conn_param param;
+	struct ip_vs_conn *ct = NULL, *cp = NULL;
+	const union nf_inet_addr *vaddr, *daddr, *caddr;
+	union nf_inet_addr snet;
+	__be16 vport;
+	unsigned int flags;
+
+	EnterFunction(12);
+	vaddr = &svc->addr;
+	vport = svc->port;
+	daddr = &iph->saddr;
+	caddr = &iph->daddr;
+
+	/* check pre-requisites are satisfied */
+	if (svc->fwmark)
+		return NULL;
+	if (!vport || !dport)
+		return NULL;
+
+	/* for persistent service first create connection template */
+	if (svc->flags & IP_VS_SVC_F_PERSISTENT) {
+		/* apply netmask the same way ingress-side does */
+#ifdef CONFIG_IP_VS_IPV6
+		if (svc->af == AF_INET6)
+			ipv6_addr_prefix(&snet.in6, &caddr->in6,
+					 (__force __u32)svc->netmask);
+		else
+#endif
+			snet.ip = caddr->ip & svc->netmask;
+		/* fill params and create template if not existent */
+		if (ip_vs_conn_fill_param_persist(svc, skb, iph->protocol,
+						  &snet, 0, vaddr,
+						  vport, &param) < 0)
+			return NULL;
+		ct = ip_vs_ct_in_get(&param);
+		if (!ct) {
+			ct = ip_vs_conn_new(&param, dest->af, daddr, dport,
+					    IP_VS_CONN_F_TEMPLATE, dest, 0);
+			if (!ct) {
+				kfree(param.pe_data);
+				return NULL;
+			}
+			ct->timeout = svc->timeout;
+		} else {
+			kfree(param.pe_data);
+		}
+	}
+
+	/* connection flags */
+	flags = ((svc->flags & IP_VS_SVC_F_ONEPACKET) &&
+		 iph->protocol == IPPROTO_UDP) ? IP_VS_CONN_F_ONE_PACKET : 0;
+	/* create connection */
+	ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
+			      caddr, cport, vaddr, vport, &param);
+	cp = ip_vs_conn_new(&param, dest->af, daddr, dport, flags, dest, 0);
+	if (!cp) {
+		if (ct)
+			ip_vs_conn_put(ct);
+		return NULL;
+	}
+	if (ct) {
+		ip_vs_control_add(cp, ct);
+		ip_vs_conn_put(ct);
+	}
+	ip_vs_conn_stats(cp, svc);
+
+	/* return connection (will be used to handle outgoing packet) */
+	IP_VS_DBG_BUF(6, "New connection RS-initiated:%c c:%s:%u v:%s:%u "
+		      "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
+		      ip_vs_fwd_tag(cp),
+		      IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
+		      IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
+		      IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
+		      cp->flags, atomic_read(&cp->refcnt));
+	LeaveFunction(12);
+	return cp;
+}
+
+/* Handle outgoing packets which are considered requests initiated by
+ * real servers, so that subsequent responses from external client can be
+ * routed to the right real server.
+ * Used also for outgoing responses in OPS mode.
+ *
+ * Connection management is handled by persistent-engine specific callback.
+ */
+static struct ip_vs_conn *__ip_vs_rs_conn_out(unsigned int hooknum,
+					      struct netns_ipvs *ipvs,
+					      int af, struct sk_buff *skb,
+					      const struct ip_vs_iphdr *iph)
+{
+	struct ip_vs_dest *dest;
+	struct ip_vs_conn *cp = NULL;
+	__be16 _ports[2], *pptr;
+
+	if (hooknum == NF_INET_LOCAL_IN)
+		return NULL;
+
+	pptr = frag_safe_skb_hp(skb, iph->len,
+				sizeof(_ports), _ports, iph);
+	if (!pptr)
+		return NULL;
+
+	rcu_read_lock();
+	dest = ip_vs_find_real_service(ipvs, af, iph->protocol,
+				       &iph->saddr, pptr[0]);
+	if (dest) {
+		struct ip_vs_service *svc;
+		struct ip_vs_pe *pe;
+
+		svc = rcu_dereference(dest->svc);
+		if (svc) {
+			pe = rcu_dereference(svc->pe);
+			if (pe && pe->conn_out)
+				cp = pe->conn_out(svc, dest, skb, iph,
+						  pptr[0], pptr[1]);
+		}
+	}
+	rcu_read_unlock();
+
+	return cp;
+}
+
 /* Handle response packets: rewrite addresses and send away...
  */
 static unsigned int
···
 
 	if (likely(cp))
 		return handle_response(af, skb, pd, cp, &iph, hooknum);
+
+	/* Check for real-server-started requests */
+	if (atomic_read(&ipvs->conn_out_counter)) {
+		/* Currently only for UDP:
+		 * connection oriented protocols typically use
+		 * ephemeral ports for outgoing connections, so
+		 * related incoming responses would not match any VS
+		 */
+		if (pp->protocol == IPPROTO_UDP) {
+			cp = __ip_vs_rs_conn_out(hooknum, ipvs, af, skb, &iph);
+			if (likely(cp))
+				return handle_response(af, skb, pd, cp, &iph,
+						       hooknum);
+		}
+	}
+
 	if (sysctl_nat_icmp_send(ipvs) &&
 	    (pp->protocol == IPPROTO_TCP ||
 	     pp->protocol == IPPROTO_UDP ||
···
 
 	if (ipvs->sync_state & IP_VS_STATE_MASTER)
 		ip_vs_sync_conn(ipvs, cp, pkts);
+	else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
+		/* increment is done inside ip_vs_sync_conn too */
+		atomic_inc(&cp->control->in_pkts);
 
 	ip_vs_conn_put(cp);
 	return ret;

net/netfilter/ipvs/ip_vs_ctl.c

···
 	return false;
 }
 
+/* Find real service record by <proto,addr,port>.
+ * In case of multiple records with the same <proto,addr,port>, only
+ * the first found record is returned.
+ *
+ * To be called under RCU lock.
+ */
+struct ip_vs_dest *ip_vs_find_real_service(struct netns_ipvs *ipvs, int af,
+					   __u16 protocol,
+					   const union nf_inet_addr *daddr,
+					   __be16 dport)
+{
+	unsigned int hash;
+	struct ip_vs_dest *dest;
+
+	/* Check for "full" addressed entries */
+	hash = ip_vs_rs_hashkey(af, daddr, dport);
+
+	hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
+		if (dest->port == dport &&
+		    dest->af == af &&
+		    ip_vs_addr_equal(af, &dest->addr, daddr) &&
+			(dest->protocol == protocol || dest->vfwmark)) {
+			/* HIT */
+			return dest;
+		}
+	}
+
+	return NULL;
+}
+
 /* Lookup destination by {addr,port} in the given service
  * Called under RCU lock.
  */
···
 		atomic_inc(&ipvs->ftpsvc_counter);
 	else if (svc->port == 0)
 		atomic_inc(&ipvs->nullsvc_counter);
+	if (svc->pe && svc->pe->conn_out)
+		atomic_inc(&ipvs->conn_out_counter);
 
 	ip_vs_start_estimator(ipvs, &svc->stats);
 
···
 	struct ip_vs_scheduler *sched = NULL, *old_sched;
 	struct ip_vs_pe *pe = NULL, *old_pe = NULL;
 	int ret = 0;
+	bool new_pe_conn_out, old_pe_conn_out;
 
 	/*
 	 * Lookup the scheduler, by 'u->sched_name'
···
 	svc->netmask = u->netmask;
 
 	old_pe = rcu_dereference_protected(svc->pe, 1);
-	if (pe != old_pe)
+	if (pe != old_pe) {
 		rcu_assign_pointer(svc->pe, pe);
+		/* check for optional methods in new pe */
+		new_pe_conn_out = (pe && pe->conn_out) ? true : false;
+		old_pe_conn_out = (old_pe && old_pe->conn_out) ? true : false;
+		if (new_pe_conn_out && !old_pe_conn_out)
+			atomic_inc(&svc->ipvs->conn_out_counter);
+		if (old_pe_conn_out && !new_pe_conn_out)
+			atomic_dec(&svc->ipvs->conn_out_counter);
+	}
 
 out:
 	ip_vs_scheduler_put(old_sched);
···
 
 	/* Unbind persistence engine, keep svc->pe */
 	old_pe = rcu_dereference_protected(svc->pe, 1);
+	if (old_pe && old_pe->conn_out)
+		atomic_dec(&ipvs->conn_out_counter);
 	ip_vs_pe_put(old_pe);
 
 	/*
···
 		    (unsigned long) ipvs);
 	atomic_set(&ipvs->ftpsvc_counter, 0);
 	atomic_set(&ipvs->nullsvc_counter, 0);
+	atomic_set(&ipvs->conn_out_counter, 0);
 
 	/* procfs stats */
 	ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);

net/netfilter/ipvs/ip_vs_nfct.c

···
 	if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
 		return;
 
+	/* Never alter conntrack for OPS conns (no reply is expected) */
+	if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
+		return;
+
 	/* Alter reply only in original direction */
 	if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
 		return;

net/netfilter/ipvs/ip_vs_pe_sip.c

···
 	return cp->pe_data_len;
 }
 
+static struct ip_vs_conn *
+ip_vs_sip_conn_out(struct ip_vs_service *svc,
+		   struct ip_vs_dest *dest,
+		   struct sk_buff *skb,
+		   const struct ip_vs_iphdr *iph,
+		   __be16 dport,
+		   __be16 cport)
+{
+	if (likely(iph->protocol == IPPROTO_UDP))
+		return ip_vs_new_conn_out(svc, dest, skb, iph, dport, cport);
+	/* currently no need to handle other than UDP */
+	return NULL;
+}
+
 static struct ip_vs_pe ip_vs_sip_pe =
 {
 	.name =			"sip",
···
 	.ct_match =		ip_vs_sip_ct_match,
 	.hashkey_raw =		ip_vs_sip_hashkey_raw,
 	.show_pe_data =		ip_vs_sip_show_pe_data,
+	.conn_out =		ip_vs_sip_conn_out,
 };
 
 static int __init ip_vs_sip_init(void)

net/netfilter/nf_conntrack_core.c

···
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_core.h>
 #include <net/netfilter/nf_nat_helper.h>
+#include <net/netns/hash.h>
 
 #define NF_CONNTRACK_VERSION	"0.5.0"
 
···
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock);
 EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock);
 
+struct hlist_nulls_head *nf_conntrack_hash __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_hash);
+
+static __read_mostly struct kmem_cache *nf_conntrack_cachep;
 static __read_mostly spinlock_t nf_conntrack_locks_all_lock;
+static __read_mostly seqcount_t nf_conntrack_generation;
 static __read_mostly bool nf_conntrack_locks_all;
 
 void nf_conntrack_lock(spinlock_t *lock) __acquires(lock)
···
 		spin_lock_nested(&nf_conntrack_locks[h1],
 				 SINGLE_DEPTH_NESTING);
 	}
-	if (read_seqcount_retry(&net->ct.generation, sequence)) {
+	if (read_seqcount_retry(&nf_conntrack_generation, sequence)) {
 		nf_conntrack_double_unlock(h1, h2);
 		return true;
 	}
···
 DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
 EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked);
 
-unsigned int nf_conntrack_hash_rnd __read_mostly;
-EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd);
+static unsigned int nf_conntrack_hash_rnd __read_mostly;
 
-static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple)
+static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple,
+			      const struct net *net)
 {
 	unsigned int n;
+	u32 seed;
+
+	get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd));
 
 	/* The direction must be ignored, so we hash everything up to the
 	 * destination ports (which is a multiple of 4) and treat the last
 	 * three bytes manually.
 	 */
+	seed = nf_conntrack_hash_rnd ^ net_hash_mix(net);
 	n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32);
-	return jhash2((u32 *)tuple, n, nf_conntrack_hash_rnd ^
+	return jhash2((u32 *)tuple, n, seed ^
 		      (((__force __u16)tuple->dst.u.all << 16) |
 		      tuple->dst.protonum));
 }
 
-static u32 __hash_bucket(u32 hash, unsigned int size)
+static u32 scale_hash(u32 hash)
 {
-	return reciprocal_scale(hash, size);
+	return reciprocal_scale(hash, nf_conntrack_htable_size);
 }
 
-static u32 hash_bucket(u32 hash, const struct net *net)
+static u32 __hash_conntrack(const struct net *net,
+			    const struct nf_conntrack_tuple *tuple,
+			    unsigned int size)
 {
-	return __hash_bucket(hash, net->ct.htable_size);
+	return reciprocal_scale(hash_conntrack_raw(tuple, net), size);
 }
 
-static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple,
-				  unsigned int size)
+static u32 hash_conntrack(const struct net *net,
+			  const struct nf_conntrack_tuple *tuple)
 {
-	return __hash_bucket(hash_conntrack_raw(tuple), size);
-}
-
-static inline u_int32_t hash_conntrack(const struct net *net,
-				       const struct nf_conntrack_tuple *tuple)
-{
-	return __hash_conntrack(tuple, net->ct.htable_size);
+	return scale_hash(hash_conntrack_raw(tuple, net));
 }
 
 bool
···
 	}
 	rcu_read_lock();
 	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
-	if (l4proto && l4proto->destroy)
+	if (l4proto->destroy)
 		l4proto->destroy(ct);
 
 	rcu_read_unlock();
···
 
 	local_bh_disable();
 	do {
-		sequence = read_seqcount_begin(&net->ct.generation);
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
 		hash = hash_conntrack(net,
 				      &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 		reply_hash = hash_conntrack(net,
···
 static inline bool
 nf_ct_key_equal(struct nf_conntrack_tuple_hash *h,
 		const struct nf_conntrack_tuple *tuple,
-		const struct nf_conntrack_zone *zone)
+		const struct nf_conntrack_zone *zone,
+		const struct net *net)
 {
 	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
 
···
 	 */
 	return nf_ct_tuple_equal(tuple, &h->tuple) &&
 	       nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) &&
-	       nf_ct_is_confirmed(ct);
+	       nf_ct_is_confirmed(ct) &&
+	       net_eq(net, nf_ct_net(ct));
 }
 
 /*
···
 		      const struct nf_conntrack_tuple *tuple, u32 hash)
 {
 	struct nf_conntrack_tuple_hash *h;
+	struct hlist_nulls_head *ct_hash;
 	struct hlist_nulls_node *n;
-	unsigned int bucket = hash_bucket(hash, net);
+	unsigned int bucket, sequence;
 
-	/* Disable BHs the entire time since we normally need to disable them
-	 * at least once for the stats anyway.
-	 */
-	local_bh_disable();
 begin:
-	hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) {
-		if (nf_ct_key_equal(h, tuple, zone)) {
-			NF_CT_STAT_INC(net, found);
-			local_bh_enable();
+	do {
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
+		bucket = scale_hash(hash);
+		ct_hash = nf_conntrack_hash;
+	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
+
+	hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) {
+		if (nf_ct_key_equal(h, tuple, zone, net)) {
+			NF_CT_STAT_INC_ATOMIC(net, found);
 			return h;
 		}
-		NF_CT_STAT_INC(net, searched);
+		NF_CT_STAT_INC_ATOMIC(net, searched);
 	}
 	/*
 	 * if the nulls value we got at the end of this lookup is
···
 	 * We probably met an item that was moved to another chain.
 	 */
 	if (get_nulls_value(n) != bucket) {
-		NF_CT_STAT_INC(net, search_restart);
+		NF_CT_STAT_INC_ATOMIC(net, search_restart);
 		goto begin;
 	}
-	local_bh_enable();
 
 	return NULL;
 }
···
 			     !atomic_inc_not_zero(&ct->ct_general.use)))
 			h = NULL;
 		else {
-			if (unlikely(!nf_ct_key_equal(h, tuple, zone))) {
+			if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) {
 				nf_ct_put(ct);
 				goto begin;
 			}
···
 		      const struct nf_conntrack_tuple *tuple)
 {
 	return __nf_conntrack_find_get(net, zone, tuple,
-				       hash_conntrack_raw(tuple));
+				       hash_conntrack_raw(tuple, net));
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 
···
 				       unsigned int hash,
 				       unsigned int reply_hash)
 {
-	struct net *net = nf_ct_net(ct);
-
 	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
-			   &net->ct.hash[hash]);
+			   &nf_conntrack_hash[hash]);
 	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
-			   &net->ct.hash[reply_hash]);
+			   &nf_conntrack_hash[reply_hash]);
 }
 
 int
···
 
 	local_bh_disable();
 	do {
-		sequence = read_seqcount_begin(&net->ct.generation);
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
 		hash = hash_conntrack(net,
 				      &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 		reply_hash = hash_conntrack(net,
···
 	} while (nf_conntrack_double_lock(net, hash, reply_hash, sequence));
 
 	/* See if there's one in the list already, including reverse */
-	hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
-		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
-				      &h->tuple) &&
-		    nf_ct_zone_equal(nf_ct_tuplehash_to_ctrack(h), zone,
-				     NF_CT_DIRECTION(h)))
+	hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode)
+		if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+				    zone, net))
 			goto out;
-	hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode)
-		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
-				      &h->tuple) &&
-		    nf_ct_zone_equal(nf_ct_tuplehash_to_ctrack(h), zone,
-				     NF_CT_DIRECTION(h)))
+
+	hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode)
+		if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
+				    zone, net))
 			goto out;
 
 	add_timer(&ct->timeout);
···
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert);
 
+static inline void nf_ct_acct_update(struct nf_conn *ct,
+				     enum ip_conntrack_info ctinfo,
+				     unsigned int len)
+{
+	struct nf_conn_acct *acct;
+
+	acct = nf_conn_acct_find(ct);
+	if (acct) {
+		struct nf_conn_counter *counter = acct->counter;
+
+		atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets);
+		atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes);
+	}
+}
+
+static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+			     const struct nf_conn *loser_ct)
+{
+	struct nf_conn_acct *acct;
+
+	acct = nf_conn_acct_find(loser_ct);
+	if (acct) {
+		struct nf_conn_counter *counter = acct->counter;
+		enum ip_conntrack_info ctinfo;
+		unsigned int bytes;
+
+		/* u32 should be fine since we must have seen one packet. */
+		bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes);
+		nf_ct_acct_update(ct, ctinfo, bytes);
+	}
+}
+
+/* Resolve race on insertion if this protocol allows this. */
+static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb,
+			       enum ip_conntrack_info ctinfo,
+			       struct nf_conntrack_tuple_hash *h)
+{
+	/* This is the conntrack entry already in hashes that won race. */
+	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
+	struct nf_conntrack_l4proto *l4proto;
+
+	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
+	if (l4proto->allow_clash &&
+	    !nf_ct_is_dying(ct) &&
+	    atomic_inc_not_zero(&ct->ct_general.use)) {
+		nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct);
+		nf_conntrack_put(skb->nfct);
+		/* Assign conntrack already in hashes to this skbuff. Don't
+		 * modify skb->nfctinfo to ensure consistent stateful filtering.
+		 */
+		skb->nfct = &ct->ct_general;
+		return NF_ACCEPT;
+	}
+	NF_CT_STAT_INC(net, drop);
+	return NF_DROP;
+}
+
 /* Confirm a connection given skb; places it in hash table */
 int
 __nf_conntrack_confirm(struct sk_buff *skb)
···
 	enum ip_conntrack_info ctinfo;
 	struct net *net;
 	unsigned int sequence;
+	int ret = NF_DROP;
 
 	ct = nf_ct_get(skb, &ctinfo);
 	net = nf_ct_net(ct);
···
 	local_bh_disable();
 
 	do {
-		sequence = read_seqcount_begin(&net->ct.generation);
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
 		/* reuse the hash saved before */
 		hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev;
-		hash = hash_bucket(hash, net);
+		hash = scale_hash(hash);
 		reply_hash = hash_conntrack(net,
 					   &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 
···
 	 */
 	nf_ct_del_from_dying_or_unconfirmed_list(ct);
 
-	if (unlikely(nf_ct_is_dying(ct)))
-		goto out;
+	if (unlikely(nf_ct_is_dying(ct))) {
+		nf_ct_add_to_dying_list(ct);
+		goto dying;
+	}
 
 	/* See if there's one in the list already, including reverse:
 	   NAT could have grabbed it without realizing, since we're
 	   not in the hash.  If there is, we lost race. */
-	hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
-		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
-				      &h->tuple) &&
-		    nf_ct_zone_equal(nf_ct_tuplehash_to_ctrack(h), zone,
-				     NF_CT_DIRECTION(h)))
+	hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode)
+		if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+				    zone, net))
 			goto out;
-	hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode)
-		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
-				      &h->tuple) &&
-		    nf_ct_zone_equal(nf_ct_tuplehash_to_ctrack(h), zone,
-				     NF_CT_DIRECTION(h)))
+
+	hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode)
+		if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
+				    zone, net))
 			goto out;
 
 	/* Timer relative to confirmation time, not original
···
 
 out:
 	nf_ct_add_to_dying_list(ct);
+	ret = nf_ct_resolve_clash(net, skb, ctinfo, h);
+dying:
 	nf_conntrack_double_unlock(hash, reply_hash);
 	NF_CT_STAT_INC(net, insert_failed);
 	local_bh_enable();
-	return NF_DROP;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
 
···
 	struct net *net = nf_ct_net(ignored_conntrack);
 	const struct nf_conntrack_zone *zone;
 	struct nf_conntrack_tuple_hash *h;
+	struct hlist_nulls_head *ct_hash;
+	unsigned int hash, sequence;
 	struct hlist_nulls_node *n;
 	struct nf_conn *ct;
-	unsigned int hash;
 
 	zone = nf_ct_zone(ignored_conntrack);
-	hash = hash_conntrack(net, tuple);
 
-	/* Disable BHs the entire time since we need to disable them at
-	 * least once for the stats anyway.
-	 */
-	rcu_read_lock_bh();
-	hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
+	rcu_read_lock();
+	do {
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
+		hash = hash_conntrack(net, tuple);
+		ct_hash = nf_conntrack_hash;
+	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
+
+	hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) {
 		ct = nf_ct_tuplehash_to_ctrack(h);
 		if (ct != ignored_conntrack &&
-		    nf_ct_tuple_equal(tuple, &h->tuple) &&
-		    nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h))) {
-			NF_CT_STAT_INC(net, found);
-			rcu_read_unlock_bh();
+		    nf_ct_key_equal(h, tuple, zone, net)) {
+			NF_CT_STAT_INC_ATOMIC(net, found);
+			rcu_read_unlock();
 			return 1;
 		}
-		NF_CT_STAT_INC(net, searched);
+		NF_CT_STAT_INC_ATOMIC(net, searched);
 	}
-	rcu_read_unlock_bh();
+	rcu_read_unlock();
 
 	return 0;
 }
···
 {
 	/* Use oldest entry, which is roughly LRU */
 	struct nf_conntrack_tuple_hash *h;
-	struct nf_conn *ct = NULL, *tmp;
+	struct nf_conn *tmp;
 	struct hlist_nulls_node *n;
-	unsigned int i = 0, cnt = 0;
-	int dropped = 0;
-	unsigned int hash, sequence;
+	unsigned int i, hash, sequence;
+	struct nf_conn *ct = NULL;
 	spinlock_t *lockp;
+	bool ret = false;
+
+	i = 0;
 
 	local_bh_disable();
 restart:
-	sequence = read_seqcount_begin(&net->ct.generation);
-	hash = hash_bucket(_hash, net);
-	for (; i < net->ct.htable_size; i++) {
+	sequence = read_seqcount_begin(&nf_conntrack_generation);
+	for (; i < NF_CT_EVICTION_RANGE; i++) {
+		hash = scale_hash(_hash++);
 		lockp = &nf_conntrack_locks[hash % CONNTRACK_LOCKS];
 		nf_conntrack_lock(lockp);
-		if (read_seqcount_retry(&net->ct.generation, sequence)) {
+		if (read_seqcount_retry(&nf_conntrack_generation, sequence)) {
 			spin_unlock(lockp);
 			goto restart;
 		}
-		hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash],
-					 hnnode) {
+		hlist_nulls_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash],
+					       hnnode) {
 			tmp = nf_ct_tuplehash_to_ctrack(h);
-			if (!test_bit(IPS_ASSURED_BIT, &tmp->status) &&
-			    !nf_ct_is_dying(tmp) &&
-			    atomic_inc_not_zero(&tmp->ct_general.use)) {
+
+			if (test_bit(IPS_ASSURED_BIT, &tmp->status) ||
+			    !net_eq(nf_ct_net(tmp), net) ||
+			    nf_ct_is_dying(tmp))
+				continue;
+
+			if (atomic_inc_not_zero(&tmp->ct_general.use)) {
 				ct = tmp;
 				break;
 			}
-			cnt++;
 		}
 
-		hash = (hash + 1) % net->ct.htable_size;
 		spin_unlock(lockp);
-
-		if (ct || cnt >= NF_CT_EVICTION_RANGE)
+		if (ct)
 			break;
-
 	}
+
 	local_bh_enable();
 
 	if (!ct)
-		return dropped;
+		return false;
 
-	if (del_timer(&ct->timeout)) {
+	/* kill only if in same netns -- might have moved due to
+	 * SLAB_DESTROY_BY_RCU rules
+	 */
+	if (net_eq(nf_ct_net(ct), net) && del_timer(&ct->timeout)) {
 		if (nf_ct_delete(ct, 0, 0)) {
-			dropped = 1;
 			NF_CT_STAT_INC_ATOMIC(net, early_drop);
+			ret = true;
 		}
 	}
+
 	nf_ct_put(ct);
-	return dropped;
-}
-
-void init_nf_conntrack_hash_rnd(void)
-{
-	unsigned int rand;
-
-	/*
-	 * Why not initialize nf_conntrack_rnd in a "init()" function ?
-	 * Because there isn't enough entropy when system initializing,
-	 * and we initialize it as late as possible.
-	 */
-	do {
-		get_random_bytes(&rand, sizeof(rand));
-	} while (!rand);
-	cmpxchg(&nf_conntrack_hash_rnd, 0, rand);
+	return ret;
 }
 
 static struct nf_conn *
···
 		     gfp_t gfp, u32 hash)
 {
 	struct nf_conn *ct;
-
-	if (unlikely(!nf_conntrack_hash_rnd)) {
-		init_nf_conntrack_hash_rnd();
-		/* recompute the hash as nf_conntrack_hash_rnd is initialized */
-		hash = hash_conntrack_raw(orig);
-	}
 
 	/* We don't want any race condition at early drop stage */
 	atomic_inc(&net->ct.count);
···
 	 * Do not use kmem_cache_zalloc(), as this cache uses
 	 * SLAB_DESTROY_BY_RCU.
 	 */
-	ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp);
+	ct = kmem_cache_alloc(nf_conntrack_cachep, gfp);
 	if (ct == NULL)
 		goto out;
 
···
 	atomic_set(&ct->ct_general.use, 0);
 	return ct;
 out_free:
-	kmem_cache_free(net->ct.nf_conntrack_cachep, ct);
+	kmem_cache_free(nf_conntrack_cachep, ct);
 out:
 	atomic_dec(&net->ct.count);
 	return ERR_PTR(-ENOMEM);
···
 
 	nf_ct_ext_destroy(ct);
 	nf_ct_ext_free(ct);
-	kmem_cache_free(net->ct.nf_conntrack_cachep, ct);
+	kmem_cache_free(nf_conntrack_cachep, ct);
 	smp_mb__before_atomic();
 	atomic_dec(&net->ct.count);
 }
···
 
 	/* look for tuple match */
 	zone = nf_ct_zone_tmpl(tmpl, skb, &tmp);
-	hash = hash_conntrack_raw(&tuple);
+	hash = hash_conntrack_raw(&tuple, net);
 	h = __nf_conntrack_find_get(net, zone, &tuple, hash);
 	if (!h) {
 		h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto,
···
 	}
 
 acct:
-	if (do_acct) {
-		struct nf_conn_acct *acct;
-
-		acct = nf_conn_acct_find(ct);
-		if (acct) {
-			struct nf_conn_counter *counter = acct->counter;
-
-			atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets);
-			atomic64_add(skb->len, &counter[CTINFO2DIR(ctinfo)].bytes);
-		}
-	}
+	if (do_acct)
+		nf_ct_acct_update(ct, ctinfo, skb->len);
 }
 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
 
···
 		       const struct sk_buff *skb,
 		       int do_acct)
 {
-	if (do_acct) {
-		struct nf_conn_acct *acct;
-
-		acct = nf_conn_acct_find(ct);
-		if (acct) {
-			struct nf_conn_counter *counter = acct->counter;
-
-			atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets);
-			atomic64_add(skb->len - skb_network_offset(skb),
-				     &counter[CTINFO2DIR(ctinfo)].bytes);
-		}
-	}
+	if (do_acct)
+		nf_ct_acct_update(ct, ctinfo, skb->len);
 
 	if (del_timer(&ct->timeout)) {
 		ct->timeout.function((unsigned long)ct);
···
 	int cpu;
 	spinlock_t *lockp;
 
-	for (; *bucket < net->ct.htable_size; (*bucket)++) {
+	for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
 		lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS];
 		local_bh_disable();
 		nf_conntrack_lock(lockp);
-		if (*bucket < net->ct.htable_size) {
-			hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) {
+		if (*bucket < nf_conntrack_htable_size) {
+			hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) {
 				if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 					continue;
 				ct = nf_ct_tuplehash_to_ctrack(h);
-				if (iter(ct, data))
+				if (net_eq(nf_ct_net(ct), net) &&
+				    iter(ct, data))
 					goto found;
 			}
 		}
···
 	unsigned int bucket = 0;
 
 	might_sleep();
+
+	if (atomic_read(&net->ct.count) == 0)
+		return;
 
 	while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) {
 		/* Time to push up daises... */
···
 	while (untrack_refs() > 0)
 		schedule();
 
+	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
+
 #ifdef CONFIG_NF_CONNTRACK_ZONES
 	nf_ct_extend_unregister(&nf_ct_zone_extend);
 #endif
···
 	}
 
 	list_for_each_entry(net, net_exit_list, exit_list) {
-		nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
 		nf_conntrack_proto_pernet_fini(net);
 		nf_conntrack_helper_pernet_fini(net);
 		nf_conntrack_ecache_pernet_fini(net);
 		nf_conntrack_tstamp_pernet_fini(net);
 		nf_conntrack_acct_pernet_fini(net);
 		nf_conntrack_expect_pernet_fini(net);
-		kmem_cache_destroy(net->ct.nf_conntrack_cachep);
-		kfree(net->ct.slabname);
 		free_percpu(net->ct.stat);
 		free_percpu(net->ct.pcpu_lists);
 	}
···
 
 	local_bh_disable();
 	nf_conntrack_all_lock();
-	write_seqcount_begin(&init_net.ct.generation);
+	write_seqcount_begin(&nf_conntrack_generation);
 
 	/* Lookups in the old hash might happen in parallel, which means we
 	 * might get false negatives during connection lookup. New connections
···
 	 * though since that required taking the locks.
 	 */
 
-	for (i = 0; i < init_net.ct.htable_size; i++) {
-		while (!hlist_nulls_empty(&init_net.ct.hash[i])) {
-			h = hlist_nulls_entry(init_net.ct.hash[i].first,
-					struct nf_conntrack_tuple_hash, hnnode);
+	for (i = 0; i < nf_conntrack_htable_size; i++) {
+		while (!hlist_nulls_empty(&nf_conntrack_hash[i])) {
+			h = hlist_nulls_entry(nf_conntrack_hash[i].first,
+					      struct nf_conntrack_tuple_hash, hnnode);
 			ct = nf_ct_tuplehash_to_ctrack(h);
 			hlist_nulls_del_rcu(&h->hnnode);
-			bucket = __hash_conntrack(&h->tuple, hashsize);
+			bucket = __hash_conntrack(nf_ct_net(ct),
+						  &h->tuple, hashsize);
 			hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
 		}
 	}
-	old_size = init_net.ct.htable_size;
-	old_hash = init_net.ct.hash;
+	old_size = nf_conntrack_htable_size;
+	old_hash = nf_conntrack_hash;
 
-	init_net.ct.htable_size = nf_conntrack_htable_size = hashsize;
-	init_net.ct.hash = hash;
+	nf_conntrack_hash = hash;
+	nf_conntrack_htable_size = hashsize;
 
-	write_seqcount_end(&init_net.ct.generation);
+	write_seqcount_end(&nf_conntrack_generation);
 	nf_conntrack_all_unlock();
 	local_bh_enable();
 
+	synchronize_net();
 	nf_ct_free_hashtable(old_hash, old_size);
 	return 0;
 }
···
 int nf_conntrack_init_start(void)
 {
 	int max_factor = 8;
-	int i, ret, cpu;
+	int ret = -ENOMEM;
+	int i, cpu;
+
+	seqcount_init(&nf_conntrack_generation);
 
 	for (i = 0; i < CONNTRACK_LOCKS; i++)
 		spin_lock_init(&nf_conntrack_locks[i]);
···
 		 * entries. */
 		max_factor = 4;
 	}
+
+	nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1);
+	if (!nf_conntrack_hash)
+		return -ENOMEM;
+
 	nf_conntrack_max = max_factor * nf_conntrack_htable_size;
+
+	nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
+						sizeof(struct nf_conn), 0,
+						SLAB_DESTROY_BY_RCU, NULL);
+	if (!nf_conntrack_cachep)
+		goto err_cachep;
 
 	printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n",
 	       NF_CONNTRACK_VERSION, nf_conntrack_htable_size,
···
 err_acct:
 	nf_conntrack_expect_fini();
 err_expect:
+	kmem_cache_destroy(nf_conntrack_cachep);
+err_cachep:
+	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
 	return ret;
 }
 
···
 	int cpu;
 
 	atomic_set(&net->ct.count, 0);
-	seqcount_init(&net->ct.generation);
 
 	net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu);
 	if (!net->ct.pcpu_lists)
···
 	if (!net->ct.stat)
 		goto err_pcpu_lists;
 
-	net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net);
-	if (!net->ct.slabname)
-		goto err_slabname;
-
-	net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname,
-							sizeof(struct nf_conn), 0,
-							SLAB_DESTROY_BY_RCU, NULL);
-	if (!net->ct.nf_conntrack_cachep) {
-		printk(KERN_ERR "Unable to create nf_conn slab cache\n");
-		goto err_cache;
-	}
-
-	net->ct.htable_size = nf_conntrack_htable_size;
-	net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1);
-	if (!net->ct.hash) {
-		printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
-		goto err_hash;
-	}
 	ret = nf_conntrack_expect_pernet_init(net);
 	if (ret < 0)
 		goto err_expect;
···
 err_acct:
 	nf_conntrack_expect_pernet_fini(net);
 err_expect:
-	nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
-err_hash:
-	kmem_cache_destroy(net->ct.nf_conntrack_cachep);
-err_cache:
-	kfree(net->ct.slabname);
-err_slabname:
 	free_percpu(net->ct.stat);
 err_pcpu_lists:
 	free_percpu(net->ct.pcpu_lists);

net/netfilter/nf_conntrack_expect.c

···
 #include <linux/moduleparam.h>
 #include <linux/export.h>
 #include <net/net_namespace.h>
+#include <net/netns/hash.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_core.h>
···
 unsigned int nf_ct_expect_hsize __read_mostly;
 EXPORT_SYMBOL_GPL(nf_ct_expect_hsize);
 
+struct hlist_head *nf_ct_expect_hash __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_expect_hash);
+
 unsigned int nf_ct_expect_max __read_mostly;
 
 static struct kmem_cache *nf_ct_expect_cachep __read_mostly;
+static unsigned int nf_ct_expect_hashrnd __read_mostly;
 
 /* nf_conntrack_expect helper functions */
 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
···
 	nf_ct_expect_put(exp);
 }
 
-static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple)
+static unsigned int nf_ct_expect_dst_hash(const struct net *n, const struct nf_conntrack_tuple *tuple)
 {
-	unsigned int hash;
+	unsigned int hash, seed;
 
-	if (unlikely(!nf_conntrack_hash_rnd)) {
-		init_nf_conntrack_hash_rnd();
-	}
+	get_random_once(&nf_ct_expect_hashrnd, sizeof(nf_ct_expect_hashrnd));
+
+	seed = nf_ct_expect_hashrnd ^ net_hash_mix(n);
 
 	hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
 		      (((tuple->dst.protonum ^ tuple->src.l3num) << 16) |
-		       (__force __u16)tuple->dst.u.all) ^ nf_conntrack_hash_rnd);
+		       (__force __u16)tuple->dst.u.all) ^ seed);
 
 	return reciprocal_scale(hash, nf_ct_expect_hsize);
+}
+
+static bool
+nf_ct_exp_equal(const struct nf_conntrack_tuple *tuple,
+		const struct nf_conntrack_expect *i,
+		const struct nf_conntrack_zone *zone,
+		const struct net *net)
+{
+	return nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) &&
+	       net_eq(net, nf_ct_net(i->master)) &&
+	       nf_ct_zone_equal_any(i->master, zone);
 }
 
 struct nf_conntrack_expect *
···
 	if (!net->ct.expect_count)
 		return NULL;
 
-	h = nf_ct_expect_dst_hash(tuple);
-	hlist_for_each_entry_rcu(i, &net->ct.expect_hash[h], hnode) {
-		if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) &&
-		    nf_ct_zone_equal_any(i->master, zone))
+	h = nf_ct_expect_dst_hash(net, tuple);
+	hlist_for_each_entry_rcu(i, &nf_ct_expect_hash[h], hnode) {
+		if (nf_ct_exp_equal(tuple, i, zone, net))
 			return i;
 	}
 	return NULL;
···
 	if (!net->ct.expect_count)
 		return NULL;
 
-	h = nf_ct_expect_dst_hash(tuple);
-	hlist_for_each_entry(i, &net->ct.expect_hash[h], hnode) {
+	h = nf_ct_expect_dst_hash(net, tuple);
+	hlist_for_each_entry(i, &nf_ct_expect_hash[h], hnode) {
 		if (!(i->flags & NF_CT_EXPECT_INACTIVE) &&
-		    nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) &&
-		    nf_ct_zone_equal_any(i->master, zone)) {
+		    nf_ct_exp_equal(tuple, i, zone, net)) {
 			exp = i;
 			break;
 		}
···
 	}
 
 	return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask) &&
+	       net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) &&
 	       nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master));
 }
 
···
 	return a->master == b->master && a->class == b->class &&
 	       nf_ct_tuple_equal(&a->tuple, &b->tuple) &&
 	       nf_ct_tuple_mask_equal(&a->mask, &b->mask) &&
+	       net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) &&
 	       nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master));
 }
 
···
 	struct nf_conn_help *master_help = nfct_help(exp->master);
 	struct nf_conntrack_helper *helper;
 	struct net *net = nf_ct_exp_net(exp);
-	unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);
+	unsigned int h = nf_ct_expect_dst_hash(net, &exp->tuple);
 
 	/* two references : one for hash insert, one for the timer */
 	atomic_add(2, &exp->use);
···
 	hlist_add_head(&exp->lnode, &master_help->expectations);
 	master_help->expecting[exp->class]++;
 
-	hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]);
+	hlist_add_head_rcu(&exp->hnode, &nf_ct_expect_hash[h]);
 	net->ct.expect_count++;
 
 	setup_timer(&exp->timeout, nf_ct_expectation_timed_out,
···
 		ret = -ESHUTDOWN;
 		goto out;
 	}
-	h = nf_ct_expect_dst_hash(&expect->tuple);
-	hlist_for_each_entry_safe(i, next, &net->ct.expect_hash[h], hnode) {
+	h = nf_ct_expect_dst_hash(net, &expect->tuple);
+	hlist_for_each_entry_safe(i, next, &nf_ct_expect_hash[h], hnode) {
 		if (expect_matches(i, expect)) {
 			if (del_timer(&i->timeout)) {
 				nf_ct_unlink_expect(i);
···
 
 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_expect_iter_state *st = seq->private;
 	struct hlist_node *n;
 
 	for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
-		n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
+		n = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
 		if (n)
 			return n;
 	}
···
 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 					     struct hlist_node *head)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_expect_iter_state *st = seq->private;
 
 	head = rcu_dereference(hlist_next_rcu(head));
 	while (head == NULL) {
 		if (++st->bucket >= nf_ct_expect_hsize)
 			return NULL;
-		head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
+		head = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket]));
 	}
 	return head;
 }
···
 
 int nf_conntrack_expect_pernet_init(struct net *net)
 {
-	int err = -ENOMEM;
-
 	net->ct.expect_count = 0;
-	net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0);
-	if (net->ct.expect_hash == NULL)
-		goto err1;
-
-	err = exp_proc_init(net);
-	if (err < 0)
-		goto err2;
-
-	return 0;
-err2:
-	nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize);
-err1:
-	return err;
+	return exp_proc_init(net);
 }
 
 void nf_conntrack_expect_pernet_fini(struct net *net)
 {
 	exp_proc_remove(net);
-	nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize);
 }
 
 int nf_conntrack_expect_init(void)
···
 				0, 0, NULL);
 	if (!nf_ct_expect_cachep)
 		return -ENOMEM;
+
+	nf_ct_expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0);
+	if (!nf_ct_expect_hash) {
+		kmem_cache_destroy(nf_ct_expect_cachep);
+		return -ENOMEM;
+	}
+
 	return 0;
 }
 
···
 {
 	rcu_barrier(); /* Wait for call_rcu() before destroy */
 	kmem_cache_destroy(nf_ct_expect_cachep);
+	nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_hsize);
 }

net/netfilter/nf_conntrack_helper.c

···
 EXPORT_SYMBOL_GPL(nf_ct_helper_hsize);
 static unsigned int nf_ct_helper_count __read_mostly;
 
-static bool nf_ct_auto_assign_helper __read_mostly = true;
+static bool nf_ct_auto_assign_helper __read_mostly = false;
 module_param_named(nf_conntrack_helper, nf_ct_auto_assign_helper, bool, 0644);
 MODULE_PARM_DESC(nf_conntrack_helper,
-		 "Enable automatic conntrack helper assignment (default 1)");
+		 "Enable automatic conntrack helper assignment (default 0)");
 
 #ifdef CONFIG_SYSCTL
 static struct ctl_table helper_sysctl_table[] = {
···
 	spin_lock_bh(&nf_conntrack_expect_lock);
 	for (i = 0; i < nf_ct_expect_hsize; i++) {
 		hlist_for_each_entry_safe(exp, next,
-					  &net->ct.expect_hash[i], hnode) {
+					  &nf_ct_expect_hash[i], hnode) {
 			struct nf_conn_help *help = nfct_help(exp->master);
 			if ((rcu_dereference_protected(
 					help->helper,
···
 		spin_unlock_bh(&pcpu->lock);
 	}
 	local_bh_disable();
-	for (i = 0; i < net->ct.htable_size; i++) {
+	for (i = 0; i < nf_conntrack_htable_size; i++) {
 		nf_conntrack_lock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]);
-		if (i < net->ct.htable_size) {
-			hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode)
+		if (i < nf_conntrack_htable_size) {
+			hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode)
 				unhelp(h, me);
 		}
 		spin_unlock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]);

net/netfilter/nf_conntrack_netlink.c

···
 	last = (struct nf_conn *)cb->args[1];
 
 	local_bh_disable();
-	for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
+	for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 restart:
 		lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
 		nf_conntrack_lock(lockp);
-		if (cb->args[0] >= net->ct.htable_size) {
+		if (cb->args[0] >= nf_conntrack_htable_size) {
 			spin_unlock(lockp);
 			goto out;
 		}
-		hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
-					 hnnode) {
+		hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
+					   hnnode) {
 			if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 				continue;
 			ct = nf_ct_tuplehash_to_ctrack(h);
+			if (!net_eq(net, nf_ct_net(ct)))
+				continue;
+
 			/* Dump entries of a given L3 protocol number.
 			 * If it is not specified, ie. l3proto == 0,
 			 * then dump everything. */
···
 	last = (struct nf_conntrack_expect *)cb->args[1];
 	for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
 restart:
-		hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
+		hlist_for_each_entry(exp, &nf_ct_expect_hash[cb->args[0]],
 				     hnode) {
 			if (l3proto && exp->tuple.src.l3num != l3proto)
 				continue;
+
+			if (!net_eq(nf_ct_net(exp->master), net))
+				continue;
+
 			if (cb->args[1]) {
 				if (exp != last)
 					continue;
···
 		spin_lock_bh(&nf_conntrack_expect_lock);
 		for (i = 0; i < nf_ct_expect_hsize; i++) {
 			hlist_for_each_entry_safe(exp, next,
-						  &net->ct.expect_hash[i],
+						  &nf_ct_expect_hash[i],
 						  hnode) {
+
+				if (!net_eq(nf_ct_exp_net(exp), net))
+					continue;
+
 				m_help = nfct_help(exp->master);
 				if (!strcmp(m_help->helper->name, name) &&
 				    del_timer(&exp->timeout)) {
···
 		spin_lock_bh(&nf_conntrack_expect_lock);
 		for (i = 0; i < nf_ct_expect_hsize; i++) {
 			hlist_for_each_entry_safe(exp, next,
-						  &net->ct.expect_hash[i],
+						  &nf_ct_expect_hash[i],
 						  hnode) {
+
+				if (!net_eq(nf_ct_exp_net(exp), net))
+					continue;
+
 				if (del_timer(&exp->timeout)) {
 					nf_ct_unlink_expect_report(exp,
 							NETLINK_CB(skb).portid,

net/netfilter/nf_conntrack_proto_udp.c

···
 	.l3proto		= PF_INET,
 	.l4proto		= IPPROTO_UDP,
 	.name			= "udp",
+	.allow_clash		= true,
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,
···
 	.l3proto		= PF_INET6,
 	.l4proto		= IPPROTO_UDP,
 	.name			= "udp",
+	.allow_clash		= true,
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,

net/netfilter/nf_conntrack_proto_udplite.c

···
 	.l3proto		= PF_INET,
 	.l4proto		= IPPROTO_UDPLITE,
 	.name			= "udplite",
+	.allow_clash		= true,
 	.pkt_to_tuple		= udplite_pkt_to_tuple,
 	.invert_tuple		= udplite_invert_tuple,
 	.print_tuple		= udplite_print_tuple,
···
 	.l3proto		= PF_INET6,
 	.l4proto		= IPPROTO_UDPLITE,
 	.name			= "udplite",
+	.allow_clash		= true,
 	.pkt_to_tuple		= udplite_pkt_to_tuple,
 	.invert_tuple		= udplite_invert_tuple,
 	.print_tuple		= udplite_print_tuple,

net/netfilter/nf_conntrack_standalone.c

···
 
 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 	struct hlist_nulls_node *n;
 
 	for (st->bucket = 0;
-	     st->bucket < net->ct.htable_size;
+	     st->bucket < nf_conntrack_htable_size;
 	     st->bucket++) {
-		n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
+		n = rcu_dereference(hlist_nulls_first_rcu(&nf_conntrack_hash[st->bucket]));
 		if (!is_a_nulls(n))
 			return n;
 	}
···
 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 				      struct hlist_nulls_node *head)
 {
-	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 
 	head = rcu_dereference(hlist_nulls_next_rcu(head));
 	while (is_a_nulls(head)) {
 		if (likely(get_nulls_value(head) == st->bucket)) {
-			if (++st->bucket >= net->ct.htable_size)
+			if (++st->bucket >= nf_conntrack_htable_size)
 				return NULL;
 		}
 		head = rcu_dereference(
 				hlist_nulls_first_rcu(
-					&net->ct.hash[st->bucket]));
+					&nf_conntrack_hash[st->bucket]));
 	}
 	return head;
 }
···
 	},
 	{
 		.procname       = "nf_conntrack_buckets",
-		.data           = &init_net.ct.htable_size,
+		.data           = &nf_conntrack_htable_size,
 		.maxlen         = sizeof(unsigned int),
 		.mode           = 0444,
 		.proc_handler   = proc_dointvec,
···
 		goto out_kmemdup;
 
 	table[1].data = &net->ct.count;
-	table[2].data = &net->ct.htable_size;
 	table[3].data = &net->ct.sysctl_checksum;
 	table[4].data = &net->ct.sysctl_log_invalid;
 

net/netfilter/nf_nat_core.c

···
 static const struct nf_nat_l4proto __rcu **nf_nat_l4protos[NFPROTO_NUMPROTO]
 						__read_mostly;
 
+static struct hlist_head *nf_nat_bysource __read_mostly;
+static unsigned int nf_nat_htable_size __read_mostly;
+static unsigned int nf_nat_hash_rnd __read_mostly;
 
 inline const struct nf_nat_l3proto *
 __nf_nat_l3proto_find(u8 family)
···
 
 /* We keep an extra hash for each conntrack, for fast searching. */
 static inline unsigned int
-hash_by_src(const struct net *net, const struct nf_conntrack_tuple *tuple)
+hash_by_src(const struct net *n, const struct nf_conntrack_tuple *tuple)
 {
 	unsigned int hash;
 
+	get_random_once(&nf_nat_hash_rnd, sizeof(nf_nat_hash_rnd));
+
 	/* Original src, to ensure we map it consistently if poss. */
 	hash = jhash2((u32 *)&tuple->src, sizeof(tuple->src) / sizeof(u32),
-		      tuple->dst.protonum ^ nf_conntrack_hash_rnd);
+		      tuple->dst.protonum ^ nf_nat_hash_rnd ^ net_hash_mix(n));
 
-	return reciprocal_scale(hash, net->ct.nat_htable_size);
+	return reciprocal_scale(hash, nf_nat_htable_size);
 }
 
 /* Is this tuple already taken? (not by us) */
···
 	const struct nf_conn_nat *nat;
 	const struct nf_conn *ct;
 
-	hlist_for_each_entry_rcu(nat, &net->ct.nat_bysource[h], bysource) {
+	hlist_for_each_entry_rcu(nat, &nf_nat_bysource[h], bysource) {
 		ct = nat->ct;
 		if (same_src(ct, tuple) &&
+		    net_eq(net, nf_ct_net(ct)) &&
 		    nf_ct_zone_equal(ct, zone, IP_CT_DIR_ORIGINAL)) {
 			/* Copy source part from reply tuple. */
 			nf_ct_invert_tuplepr(result,
···
 		nat = nfct_nat(ct);
 		nat->ct = ct;
 		hlist_add_head_rcu(&nat->bysource,
-				   &net->ct.nat_bysource[srchash]);
+				   &nf_nat_bysource[srchash]);
 		spin_unlock_bh(&nf_nat_lock);
 	}
 
···
 }
 #endif
 
-static int __net_init nf_nat_net_init(struct net *net)
-{
-	/* Leave them the same for the moment. */
-	net->ct.nat_htable_size = net->ct.htable_size;
-	net->ct.nat_bysource = nf_ct_alloc_hashtable(&net->ct.nat_htable_size, 0);
-	if (!net->ct.nat_bysource)
-		return -ENOMEM;
-	return 0;
-}
-
 static void __net_exit nf_nat_net_exit(struct net *net)
 {
 	struct nf_nat_proto_clean clean = {};
 
 	nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean, 0, 0);
-	synchronize_rcu();
-	nf_ct_free_hashtable(net->ct.nat_bysource, net->ct.nat_htable_size);
 }
 
 static struct pernet_operations nf_nat_net_ops = {
-	.init = nf_nat_net_init,
 	.exit = nf_nat_net_exit,
 };
 
···
 {
 	int ret;
 
+	/* Leave them the same for the moment. */
+	nf_nat_htable_size = nf_conntrack_htable_size;
+
+	nf_nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size, 0);
+	if (!nf_nat_bysource)
+		return -ENOMEM;
+
 	ret = nf_ct_extend_register(&nat_extend);
 	if (ret < 0) {
+		nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
 		printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
 		return ret;
 	}
···
 	return 0;
 
  cleanup_extend:
+	nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
 	nf_ct_extend_unregister(&nat_extend);
 	return ret;
 }
···
 	for (i = 0; i < NFPROTO_NUMPROTO; i++)
 		kfree(nf_nat_l4protos[i]);
 	synchronize_net();
+	nf_ct_free_hashtable(nf_nat_bysource, nf_nat_htable_size);
 }
 
 MODULE_LICENSE("GPL");

net/netfilter/nf_tables_api.c

···
 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
 	[NFTA_SET_TABLE]		= { .type = NLA_STRING },
 	[NFTA_SET_NAME]			= { .type = NLA_STRING,
-					    .len = IFNAMSIZ - 1 },
+					    .len = NFT_SET_MAXNAMELEN - 1 },
 	[NFTA_SET_FLAGS]		= { .type = NLA_U32 },
 	[NFTA_SET_KEY_TYPE]		= { .type = NLA_U32 },
 	[NFTA_SET_KEY_LEN]		= { .type = NLA_U32 },
···
 	unsigned long *inuse;
 	unsigned int n = 0, min = 0;
 
-	p = strnchr(name, IFNAMSIZ, '%');
+	p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
 	if (p != NULL) {
 		if (p[1] != 'd' || strchr(p + 2, '%'))
 			return -EINVAL;
···
 	struct nft_table *table;
 	struct nft_set *set;
 	struct nft_ctx ctx;
-	char name[IFNAMSIZ];
+	char name[NFT_SET_MAXNAMELEN];
 	unsigned int size;
 	bool create;
 	u64 timeout;
···
 }
 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
 
+static int nft_setelem_parse_flags(const struct nft_set *set,
+				   const struct nlattr *attr, u32 *flags)
+{
+	if (attr == NULL)
+		return 0;
+
+	*flags = ntohl(nla_get_be32(attr));
+	if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
+		return -EINVAL;
+	if (!(set->flags & NFT_SET_INTERVAL) &&
+	    *flags & NFT_SET_ELEM_INTERVAL_END)
+		return -EINVAL;
+
+	return 0;
+}
+
 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 			    const struct nlattr *attr)
 {
···
 	struct nft_data data;
 	enum nft_registers dreg;
 	struct nft_trans *trans;
+	u32 flags = 0;
 	u64 timeout;
-	u32 flags;
 	u8 ulen;
 	int err;
 
···
 
 	nft_set_ext_prepare(&tmpl);
 
-	flags = 0;
-	if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
-		flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
-		if (flags & ~NFT_SET_ELEM_INTERVAL_END)
-			return -EINVAL;
-		if (!(set->flags & NFT_SET_INTERVAL) &&
-		    flags & NFT_SET_ELEM_INTERVAL_END)
-			return -EINVAL;
-		if (flags != 0)
-			nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
-	}
+	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
+	if (err < 0)
+		return err;
+	if (flags != 0)
+		nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
 
 	if (set->flags & NFT_SET_MAP) {
 		if (nla[NFTA_SET_ELEM_DATA] == NULL &&
···
 			   const struct nlattr *attr)
 {
 	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
+	struct nft_set_ext_tmpl tmpl;
 	struct nft_data_desc desc;
 	struct nft_set_elem elem;
+	struct nft_set_ext *ext;
 	struct nft_trans *trans;
+	u32 flags = 0;
+	void *priv;
 	int err;
 
 	err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
···
 	if (nla[NFTA_SET_ELEM_KEY] == NULL)
 		goto err1;
 
+	nft_set_ext_prepare(&tmpl);
+
+	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
+	if (err < 0)
+		return err;
+	if (flags != 0)
+		nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
+
 	err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
 			    nla[NFTA_SET_ELEM_KEY]);
 	if (err < 0)
···
 	if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
 		goto err2;
 
+	nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
+
+	err = -ENOMEM;
+	elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
+				      GFP_KERNEL);
+	if (elem.priv == NULL)
+		goto err2;
+
+	ext = nft_set_elem_ext(set, elem.priv);
+	if (flags)
+		*nft_set_ext_flags(ext) = flags;
+
 	trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
 	if (trans == NULL) {
 		err = -ENOMEM;
-		goto err2;
-	}
-
-	elem.priv = set->ops->deactivate(set, &elem);
-	if (elem.priv == NULL) {
-		err = -ENOENT;
 		goto err3;
 	}
+
+	priv = set->ops->deactivate(set, &elem);
+	if (priv == NULL) {
+		err = -ENOENT;
+		goto err4;
+	}
+	kfree(elem.priv);
+	elem.priv = priv;
 
 	nft_trans_elem(trans) = elem;
 	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 	return 0;
 
-err3:
+err4:
 	kfree(trans);
+err3:
+	kfree(elem.priv);
 err2:
 	nft_data_uninit(&elem.key.val, desc.type);
 err1:

net/netfilter/nfnetlink_cttimeout.c

···
 	int i;
 
 	local_bh_disable();
-	for (i = 0; i < net->ct.htable_size; i++) {
+	for (i = 0; i < nf_conntrack_htable_size; i++) {
 		nf_conntrack_lock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]);
-		if (i < net->ct.htable_size) {
-			hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode)
+		if (i < nf_conntrack_htable_size) {
+			hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode)
 				untimeout(h, timeout);
 		}
 		spin_unlock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]);

net/netfilter/nft_ct.c

···
 		}
 		break;
 #endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	case NFT_CT_LABELS:
+		nf_connlabels_replace(ct,
+				      &regs->data[priv->sreg],
+				      &regs->data[priv->sreg],
+				      NF_CT_LABELS_MAX_SIZE / sizeof(u32));
+		break;
+#endif
 	default:
 		break;
 	}
···
 		len = FIELD_SIZEOF(struct nf_conn, mark);
 		break;
 #endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	case NFT_CT_LABELS:
+		if (tb[NFTA_CT_DIRECTION])
+			return -EINVAL;
+		len = NF_CT_LABELS_MAX_SIZE;
+		err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
+		if (err)
+			return err;
+		break;
+#endif
 	default:
 		return -EOPNOTSUPP;
 	}
···
 static void nft_ct_destroy(const struct nft_ctx *ctx,
 			   const struct nft_expr *expr)
 {
+	struct nft_ct *priv = nft_expr_priv(expr);
+
+	switch (priv->key) {
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	case NFT_CT_LABELS:
+		nf_connlabels_put(ctx->net);
+		break;
+#endif
+	default:
+		break;
+	}
+
 	nft_ct_l3proto_module_put(ctx->afi->family);
 }
 

net/netfilter/nft_rbtree.c

···
 	struct nft_set_ext	ext;
 };
 
+static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe)
+{
+	return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
+	       (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END);
+}
+
+static bool nft_rbtree_equal(const struct nft_set *set, const void *this,
+			     const struct nft_rbtree_elem *interval)
+{
+	return memcmp(this, nft_set_ext_key(&interval->ext), set->klen) == 0;
+}
 
 static bool nft_rbtree_lookup(const struct nft_set *set, const u32 *key,
 			      const struct nft_set_ext **ext)
···
 	const struct nft_rbtree_elem *rbe, *interval = NULL;
 	const struct rb_node *parent;
 	u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
+	const void *this;
 	int d;
 
 	spin_lock_bh(&nft_rbtree_lock);
···
 	while (parent != NULL) {
 		rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 
-		d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen);
+		this = nft_set_ext_key(&rbe->ext);
+		d = memcmp(this, key, set->klen);
 		if (d < 0) {
 			parent = parent->rb_left;
+			/* In case of adjacent ranges, we always see the high
+			 * part of the range in first place, before the low one.
+			 * So don't update interval if the keys are equal.
+			 */
+			if (interval && nft_rbtree_equal(set, this, interval))
+				continue;
 			interval = rbe;
 		} else if (d > 0)
 			parent = parent->rb_right;
···
 				parent = parent->rb_left;
 				continue;
 			}
-			if (nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
-			    *nft_set_ext_flags(&rbe->ext) &
-			    NFT_SET_ELEM_INTERVAL_END)
+			if (nft_rbtree_interval_end(rbe))
 				goto out;
 			spin_unlock_bh(&nft_rbtree_lock);
 
···
 		else if (d > 0)
 			p = &parent->rb_right;
 		else {
-			if (nft_set_elem_active(&rbe->ext, genmask))
-				return -EEXIST;
-			p = &parent->rb_left;
+			if (nft_set_elem_active(&rbe->ext, genmask)) {
+				if (nft_rbtree_interval_end(rbe) &&
+				    !nft_rbtree_interval_end(new))
+					p = &parent->rb_left;
+				else if (!nft_rbtree_interval_end(rbe) &&
+					 nft_rbtree_interval_end(new))
+					p = &parent->rb_right;
+				else
+					return -EEXIST;
+			}
 		}
 	}
 	rb_link_node(&new->node, parent, p);
···
 {
 	const struct nft_rbtree *priv = nft_set_priv(set);
 	const struct rb_node *parent = priv->root.rb_node;
-	struct nft_rbtree_elem *rbe;
+	struct nft_rbtree_elem *rbe, *this = elem->priv;
 	u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
 	int d;
 
···
 		else {
 			if (!nft_set_elem_active(&rbe->ext, genmask)) {
 				parent = parent->rb_left;
+				continue;
+			}
+			if (nft_rbtree_interval_end(rbe) &&
+			    !nft_rbtree_interval_end(this)) {
+				parent = parent->rb_left;
+				continue;
+			} else if (!nft_rbtree_interval_end(rbe) &&
+				   nft_rbtree_interval_end(this)) {
+				parent = parent->rb_right;
 				continue;
 			}
 			nft_set_elem_change_active(set, &rbe->ext);

net/openvswitch/conntrack.c

···
 	u8 protonum;
 
 	l3proto = __nf_ct_l3proto_find(l3num);
-	if (!l3proto) {
-		pr_debug("ovs_ct_find_existing: Can't get l3proto\n");
-		return NULL;
-	}
 	if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff,
 				 &protonum) <= 0) {
 		pr_debug("ovs_ct_find_existing: Can't get protonum\n");
 		return NULL;
 	}
 	l4proto = __nf_ct_l4proto_find(l3num, protonum);
-	if (!l4proto) {
-		pr_debug("ovs_ct_find_existing: Can't get l4proto\n");
-		return NULL;
-	}
 	if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num,
 			     protonum, net, &tuple, l3proto, l4proto)) {
 		pr_debug("ovs_ct_find_existing: Can't get tuple\n");