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

Pablo Neira Ayuso says:

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

The following patchset contains Netfilter updates for your net-next
tree, they are:

1) Stash ctinfo 3-bit field into pointer to nf_conntrack object from
sk_buff so we only access one single cacheline in the conntrack
hotpath. Patchset from Florian Westphal.

2) Don't leak pointer to internal structures when exporting x_tables
ruleset back to userspace, from Willem DeBruijn. This includes new
helper functions to copy data to userspace such as xt_data_to_user()
as well as conversions of our ip_tables, ip6_tables and arp_tables
clients to use it. Not surprinsingly, ebtables requires an ad-hoc
update. There is also a new field in x_tables extensions to indicate
the amount of bytes that we copy to userspace.

3) Add nf_log_all_netns sysctl: This new knob allows you to enable
logging via nf_log infrastructure for all existing netnamespaces.
Given the effort to provide pernet syslog has been discontinued,
let's provide a way to restore logging using netfilter kernel logging
facilities in trusted environments. Patch from Michal Kubecek.

4) Validate SCTP checksum from conntrack helper, from Davide Caratti.

5) Merge UDPlite conntrack and NAT helpers into UDP, this was mostly
a copy&paste from the original helper, from Florian Westphal.

6) Reset netfilter state when duplicating packets, also from Florian.

7) Remove unnecessary check for broadcast in IPv6 in pkttype match and
nft_meta, from Liping Zhang.

8) Add missing code to deal with loopback packets from nft_meta when
used by the netdev family, also from Liping.

9) Several cleanups on nf_tables, one to remove unnecessary check from
the netlink control plane path to add table, set and stateful objects
and code consolidation when unregister chain hooks, from Gao Feng.

10) Fix harmless reference counter underflow in IPVS that, however,
results in problems with the introduction of the new refcount_t
type, from David Windsor.

11) Enable LIBCRC32C from nf_ct_sctp instead of nf_nat_sctp,
from Davide Caratti.

12) Missing documentation on nf_tables uapi header, from Liping Zhang.

13) Use rb_entry() helper in xt_connlimit, from Geliang Tang.
====================

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

Documentation/networking/netfilter-sysctl.txt

···
+/proc/sys/net/netfilter/* Variables:
+
+nf_log_all_netns - BOOLEAN
+	0 - disabled (default)
+	not 0 - enabled
+
+	By default, only init_net namespace can log packets into kernel log
+	with LOG target; this aims to prevent containers from flooding host
+	kernel log. If enabled, this target also works in other network
+	namespaces. This variable is only accessible from init_net.

include/linux/netfilter/x_tables.h

···
 
 	const char *table;
 	unsigned int matchsize;
+	unsigned int usersize;
 #ifdef CONFIG_COMPAT
 	unsigned int compatsize;
 #endif
···
 
 	const char *table;
 	unsigned int targetsize;
+	unsigned int usersize;
 #ifdef CONFIG_COMPAT
 	unsigned int compatsize;
 #endif
···
 		   bool inv_proto);
 int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto,
 		    bool inv_proto);
+
+int xt_match_to_user(const struct xt_entry_match *m,
+		     struct xt_entry_match __user *u);
+int xt_target_to_user(const struct xt_entry_target *t,
+		      struct xt_entry_target __user *u);
+int xt_data_to_user(void __user *dst, const void *src,
+		    int usersize, int size);
 
 void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
 				 struct xt_counters_info *info, bool compat);

include/linux/skbuff.h

···
  *	@cloned: Head may be cloned (check refcnt to be sure)
  *	@ip_summed: Driver fed us an IP checksum
  *	@nohdr: Payload reference only, must not modify header
- *	@nfctinfo: Relationship of this skb to the connection
  *	@pkt_type: Packet class
  *	@fclone: skbuff clone status
  *	@ipvs_property: skbuff is owned by ipvs
···
  *	@nf_trace: netfilter packet trace flag
  *	@protocol: Packet protocol from driver
  *	@destructor: Destruct function
- *	@nfct: Associated connection, if any
+ *	@_nfct: Associated connection, if any (with nfctinfo bits)
  *	@nf_bridge: Saved data about a bridged frame - see br_netfilter.c
  *	@skb_iif: ifindex of device we arrived on
  *	@tc_index: Traffic control index
···
 	struct	sec_path	*sp;
 #endif
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
-	struct nf_conntrack	*nfct;
+	unsigned long		 _nfct;
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	struct nf_bridge_info	*nf_bridge;
···
 	__u8			pkt_type:3;
 	__u8			pfmemalloc:1;
 	__u8			ignore_df:1;
-	__u8			nfctinfo:3;
 
 	__u8			nf_trace:1;
 	__u8			ip_summed:2;
···
 #define SKB_DST_NOREF	1UL
 #define SKB_DST_PTRMASK	~(SKB_DST_NOREF)
 
+#define SKB_NFCT_PTRMASK	~(7UL)
 /**
  * skb_dst - returns skb dst_entry
  * @skb: buffer
···
 	skb->csum = csum_add(skb->csum, delta);
 }
 
+static inline struct nf_conntrack *skb_nfct(const struct sk_buff *skb)
+{
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+	return (void *)(skb->_nfct & SKB_NFCT_PTRMASK);
+#else
+	return NULL;
+#endif
+}
+
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 void nf_conntrack_destroy(struct nf_conntrack *nfct);
 static inline void nf_conntrack_put(struct nf_conntrack *nfct)
···
 static inline void nf_reset(struct sk_buff *skb)
 {
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
-	nf_conntrack_put(skb->nfct);
-	skb->nfct = NULL;
+	nf_conntrack_put(skb_nfct(skb));
+	skb->_nfct = 0;
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	nf_bridge_put(skb->nf_bridge);
···
 			     bool copy)
 {
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
-	dst->nfct = src->nfct;
-	nf_conntrack_get(src->nfct);
-	if (copy)
-		dst->nfctinfo = src->nfctinfo;
+	dst->_nfct = src->_nfct;
+	nf_conntrack_get(skb_nfct(src));
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	dst->nf_bridge  = src->nf_bridge;
···
 static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src)
 {
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
-	nf_conntrack_put(dst->nfct);
+	nf_conntrack_put(skb_nfct(dst));
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	nf_bridge_put(dst->nf_bridge);
···
 #if IS_ENABLED(CONFIG_XFRM)
 		!skb->sp &&
 #endif
-#if IS_ENABLED(CONFIG_NF_CONNTRACK)
-		!skb->nfct &&
-#endif
+		!skb_nfct(skb) &&
 		!skb->_skb_refdst &&
 		!skb_has_frag_list(skb);
 }

include/net/ip_vs.h

···
 
 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
 {
-	if (atomic_dec_return(&dest->refcnt) < 0)
+	if (atomic_dec_and_test(&dest->refcnt))
 		kfree(dest);
 }
 
···
 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 
 	if (!ct || !nf_ct_is_untracked(ct)) {
-		nf_conntrack_put(skb->nfct);
-		skb->nfct = &nf_ct_untracked_get()->ct_general;
-		skb->nfctinfo = IP_CT_NEW;
-		nf_conntrack_get(skb->nfct);
+		struct nf_conn *untracked;
+
+		nf_conntrack_put(&ct->ct_general);
+		untracked = nf_ct_untracked_get();
+		nf_conntrack_get(&untracked->ct_general);
+		nf_ct_set(skb, untracked, IP_CT_NEW);
 	}
 #endif
 }

include/net/netfilter/ipv4/nf_conntrack_ipv4.h

···
 
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4;
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4;
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp;
 #ifdef CONFIG_NF_CT_PROTO_DCCP
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp4;

include/net/netfilter/ipv6/nf_conntrack_ipv6.h

···
 
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
+extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6;
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6;
 #ifdef CONFIG_NF_CT_PROTO_DCCP
 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp6;

include/net/netfilter/nf_conntrack.h

···
 	struct ip_ct_sctp sctp;
 	struct ip_ct_tcp tcp;
 	struct nf_ct_gre gre;
+	unsigned int tmpl_padto;
 };
 
 union nf_conntrack_expect_proto {
···
 	/* Usage count in here is 1 for hash table, 1 per skb,
 	 * plus 1 for any connection(s) we are `master' for
 	 *
-	 * Hint, SKB address this struct and refcnt via skb->nfct and
+	 * Hint, SKB address this struct and refcnt via skb->_nfct and
 	 * helpers nf_conntrack_get() and nf_conntrack_put().
 	 * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
 	 * beware nf_ct_get() is different and don't inc refcnt.
···
 int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
 			     const struct nf_conn *ignored_conntrack);
 
+#define NFCT_INFOMASK	7UL
+#define NFCT_PTRMASK	~(NFCT_INFOMASK)
+
 /* Return conntrack_info and tuple hash for given skb. */
 static inline struct nf_conn *
 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
 {
-	*ctinfo = skb->nfctinfo;
-	return (struct nf_conn *)skb->nfct;
+	*ctinfo = skb->_nfct & NFCT_INFOMASK;
+
+	return (struct nf_conn *)(skb->_nfct & NFCT_PTRMASK);
 }
 
 /* decrement reference count on a conntrack */
···
 				 const struct nf_conntrack_zone *zone,
 				 gfp_t flags);
 void nf_ct_tmpl_free(struct nf_conn *tmpl);
+
+static inline void
+nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info)
+{
+	skb->_nfct = (unsigned long)ct | info;
+}
 
 #define NF_CT_STAT_INC(net, count)	  __this_cpu_inc((net)->ct.stat->count)
 #define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)

include/net/netfilter/nf_conntrack_core.h

···
 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
 static inline int nf_conntrack_confirm(struct sk_buff *skb)
 {
-	struct nf_conn *ct = (struct nf_conn *)skb->nfct;
+	struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
 	int ret = NF_ACCEPT;
 
 	if (ct && !nf_ct_is_untracked(ct)) {

include/net/netfilter/nf_conntrack_l4proto.h

···
 	void (*destroy)(struct nf_conn *ct);
 
 	int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
-		     unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+		     unsigned int dataoff,
 		     u_int8_t pf, unsigned int hooknum);
 
 	/* Print out the per-protocol part of the tuple. Return like seq_* */

include/net/netfilter/nf_log.h

···
 	struct module		*me;
 };
 
+/* sysctl_nf_log_all_netns - allow LOG target in all network namespaces */
+extern int sysctl_nf_log_all_netns;
+
 /* Function to register/unregister log function. */
 int nf_log_register(u_int8_t pf, struct nf_logger *logger);
 void nf_log_unregister(struct nf_logger *logger);

include/net/netns/conntrack.h

···
 };
 #endif
 
-#ifdef CONFIG_NF_CT_PROTO_UDPLITE
-enum udplite_conntrack {
-	UDPLITE_CT_UNREPLIED,
-	UDPLITE_CT_REPLIED,
-	UDPLITE_CT_MAX
-};
-
-struct nf_udplite_net {
-	struct nf_proto_net pn;
-	unsigned int timeouts[UDPLITE_CT_MAX];
-};
-#endif
-
 struct nf_ip_net {
 	struct nf_generic_net   generic;
 	struct nf_tcp_net	tcp;
···
 #endif
 #ifdef CONFIG_NF_CT_PROTO_SCTP
 	struct nf_sctp_net	sctp;
-#endif
-#ifdef CONFIG_NF_CT_PROTO_UDPLITE
-	struct nf_udplite_net	udplite;
 #endif
 };
 

include/uapi/linux/netfilter/nf_tables.h

···
  * @NFT_CT_PROTOCOL: conntrack layer 4 protocol
  * @NFT_CT_PROTO_SRC: conntrack layer 4 protocol source
  * @NFT_CT_PROTO_DST: conntrack layer 4 protocol destination
+ * @NFT_CT_LABELS: conntrack labels
+ * @NFT_CT_PKTS: conntrack packets
+ * @NFT_CT_BYTES: conntrack bytes
+ * @NFT_CT_AVGPKT: conntrack average bytes per packet
  */
 enum nft_ct_keys {
 	NFT_CT_STATE,
···
 	NFT_CT_LABELS,
 	NFT_CT_PKTS,
 	NFT_CT_BYTES,
+	NFT_CT_AVGPKT,
 };
 
 /**

net/bridge/netfilter/ebt_limit.c

···
 	.match		= ebt_limit_mt,
 	.checkentry	= ebt_limit_mt_check,
 	.matchsize	= sizeof(struct ebt_limit_info),
+	.usersize	= offsetof(struct ebt_limit_info, prev),
 #ifdef CONFIG_COMPAT
 	.compatsize	= sizeof(struct ebt_compat_limit_info),
 #endif

net/bridge/netfilter/ebt_log.c

···
 	unsigned int bitmask;
 
 	/* FIXME: Disabled from containers until syslog ns is supported */
-	if (!net_eq(net, &init_net))
+	if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
 		return;
 
 	spin_lock_bh(&ebt_log_lock);

net/bridge/netfilter/ebtables.c

···
 				hlp.num_counters, user, len);
 }
 
-static inline int ebt_make_matchname(const struct ebt_entry_match *m,
-				     const char *base, char __user *ubase)
+static inline int ebt_obj_to_user(char __user *um, const char *_name,
+				  const char *data, int entrysize,
+				  int usersize, int datasize)
 {
-	char __user *hlp = ubase + ((char *)m - base);
-	char name[EBT_FUNCTION_MAXNAMELEN] = {};
+	char name[EBT_FUNCTION_MAXNAMELEN] = {0};
 
 	/* ebtables expects 32 bytes long names but xt_match names are 29 bytes
 	 * long. Copy 29 bytes and fill remaining bytes with zeroes.
 	 */
-	strlcpy(name, m->u.match->name, sizeof(name));
-	if (copy_to_user(hlp, name, EBT_FUNCTION_MAXNAMELEN))
+	strlcpy(name, _name, sizeof(name));
+	if (copy_to_user(um, name, EBT_FUNCTION_MAXNAMELEN) ||
+	    put_user(datasize, (int __user *)(um + EBT_FUNCTION_MAXNAMELEN)) ||
+	    xt_data_to_user(um + entrysize, data, usersize, datasize))
 		return -EFAULT;
+
 	return 0;
 }
 
-static inline int ebt_make_watchername(const struct ebt_entry_watcher *w,
-				       const char *base, char __user *ubase)
+static inline int ebt_match_to_user(const struct ebt_entry_match *m,
+				    const char *base, char __user *ubase)
 {
-	char __user *hlp = ubase + ((char *)w - base);
-	char name[EBT_FUNCTION_MAXNAMELEN] = {};
-
-	strlcpy(name, w->u.watcher->name, sizeof(name));
-	if (copy_to_user(hlp, name, EBT_FUNCTION_MAXNAMELEN))
-		return -EFAULT;
-	return 0;
+	return ebt_obj_to_user(ubase + ((char *)m - base),
+			       m->u.match->name, m->data, sizeof(*m),
+			       m->u.match->usersize, m->match_size);
 }
 
-static inline int ebt_make_names(struct ebt_entry *e, const char *base,
-				 char __user *ubase)
+static inline int ebt_watcher_to_user(const struct ebt_entry_watcher *w,
+				      const char *base, char __user *ubase)
+{
+	return ebt_obj_to_user(ubase + ((char *)w - base),
+			       w->u.watcher->name, w->data, sizeof(*w),
+			       w->u.watcher->usersize, w->watcher_size);
+}
+
+static inline int ebt_entry_to_user(struct ebt_entry *e, const char *base,
+				    char __user *ubase)
 {
 	int ret;
 	char __user *hlp;
 	const struct ebt_entry_target *t;
-	char name[EBT_FUNCTION_MAXNAMELEN] = {};
 
-	if (e->bitmask == 0)
+	if (e->bitmask == 0) {
+		/* special case !EBT_ENTRY_OR_ENTRIES */
+		if (copy_to_user(ubase + ((char *)e - base), e,
+				 sizeof(struct ebt_entries)))
+			return -EFAULT;
 		return 0;
+	}
+
+	if (copy_to_user(ubase + ((char *)e - base), e, sizeof(*e)))
+		return -EFAULT;
 
 	hlp = ubase + (((char *)e + e->target_offset) - base);
 	t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
 
-	ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase);
+	ret = EBT_MATCH_ITERATE(e, ebt_match_to_user, base, ubase);
 	if (ret != 0)
 		return ret;
-	ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
+	ret = EBT_WATCHER_ITERATE(e, ebt_watcher_to_user, base, ubase);
 	if (ret != 0)
 		return ret;
-	strlcpy(name, t->u.target->name, sizeof(name));
-	if (copy_to_user(hlp, name, EBT_FUNCTION_MAXNAMELEN))
-		return -EFAULT;
+	ret = ebt_obj_to_user(hlp, t->u.target->name, t->data, sizeof(*t),
+			      t->u.target->usersize, t->target_size);
+	if (ret != 0)
+		return ret;
+
 	return 0;
 }
 
···
 	if (ret)
 		return ret;
 
-	if (copy_to_user(tmp.entries, entries, entries_size)) {
-		BUGPRINT("Couldn't copy entries to userspace\n");
-		return -EFAULT;
-	}
 	/* set the match/watcher/target names right */
 	return EBT_ENTRY_ITERATE(entries, entries_size,
-	   ebt_make_names, entries, tmp.entries);
+	   ebt_entry_to_user, entries, tmp.entries);
 }
 
 static int do_ebt_set_ctl(struct sock *sk,
···
 	if (match->compat_to_user) {
 		if (match->compat_to_user(cm->data, m->data))
 			return -EFAULT;
-	} else if (copy_to_user(cm->data, m->data, msize))
+	} else {
+		if (xt_data_to_user(cm->data, m->data, match->usersize, msize))
 			return -EFAULT;
+	}
 
 	*size -= ebt_compat_entry_padsize() + off;
 	*dstptr = cm->data;
···
 	if (target->compat_to_user) {
 		if (target->compat_to_user(cm->data, t->data))
 			return -EFAULT;
-	} else if (copy_to_user(cm->data, t->data, tsize))
-		return -EFAULT;
+	} else {
+		if (xt_data_to_user(cm->data, t->data, target->usersize, tsize))
+			return -EFAULT;
+	}
 
 	*size -= ebt_compat_entry_padsize() + off;
 	*dstptr = cm->data;

net/core/skbuff.c

···
 		skb->destructor(skb);
 	}
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	nf_conntrack_put(skb->nfct);
+	nf_conntrack_put(skb_nfct(skb));
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	nf_bridge_put(skb->nf_bridge);

net/ipv4/netfilter/arp_tables.c

···
 		return PTR_ERR(counters);
 
 	loc_cpu_entry = private->entries;
-	/* ... then copy entire thing ... */
-	if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
-		ret = -EFAULT;
-		goto free_counters;
-	}
 
 	/* FIXME: use iterator macros --RR */
 	/* ... then go back and fix counters and names */
···
 		const struct xt_entry_target *t;
 
 		e = (struct arpt_entry *)(loc_cpu_entry + off);
+		if (copy_to_user(userptr + off, e, sizeof(*e))) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
 		if (copy_to_user(userptr + off
 				 + offsetof(struct arpt_entry, counters),
 				 &counters[num],
···
 		}
 
 		t = arpt_get_target_c(e);
-		if (copy_to_user(userptr + off + e->target_offset
-				 + offsetof(struct xt_entry_target,
-					    u.user.name),
-				 t->u.kernel.target->name,
-				 strlen(t->u.kernel.target->name)+1) != 0) {
+		if (xt_target_to_user(t, userptr + off + e->target_offset)) {
 			ret = -EFAULT;
 			goto free_counters;
 		}

net/ipv4/netfilter/ip_tables.c

···
 		return PTR_ERR(counters);
 
 	loc_cpu_entry = private->entries;
-	if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
-		ret = -EFAULT;
-		goto free_counters;
-	}
 
 	/* FIXME: use iterator macros --RR */
 	/* ... then go back and fix counters and names */
···
 		const struct xt_entry_target *t;
 
 		e = (struct ipt_entry *)(loc_cpu_entry + off);
+		if (copy_to_user(userptr + off, e, sizeof(*e))) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
 		if (copy_to_user(userptr + off
 				 + offsetof(struct ipt_entry, counters),
 				 &counters[num],
···
 		     i += m->u.match_size) {
 			m = (void *)e + i;
 
-			if (copy_to_user(userptr + off + i
-					 + offsetof(struct xt_entry_match,
-						    u.user.name),
-					 m->u.kernel.match->name,
-					 strlen(m->u.kernel.match->name)+1)
-			    != 0) {
+			if (xt_match_to_user(m, userptr + off + i)) {
 				ret = -EFAULT;
 				goto free_counters;
 			}
 		}
 
 		t = ipt_get_target_c(e);
-		if (copy_to_user(userptr + off + e->target_offset
-				 + offsetof(struct xt_entry_target,
-					    u.user.name),
-				 t->u.kernel.target->name,
-				 strlen(t->u.kernel.target->name)+1) != 0) {
+		if (xt_target_to_user(t, userptr + off + e->target_offset)) {
 			ret = -EFAULT;
 			goto free_counters;
 		}

net/ipv4/netfilter/ipt_CLUSTERIP.c

···
 	.checkentry	= clusterip_tg_check,
 	.destroy	= clusterip_tg_destroy,
 	.targetsize	= sizeof(struct ipt_clusterip_tgt_info),
+	.usersize	= offsetof(struct ipt_clusterip_tgt_info, config),
 #ifdef CONFIG_COMPAT
 	.compatsize	= sizeof(struct compat_ipt_clusterip_tgt_info),
 #endif /* CONFIG_COMPAT */

net/ipv4/netfilter/ipt_SYNPROXY.c

···
 		goto free_nskb;
 
 	if (nfct) {
-		nskb->nfct = nfct;
-		nskb->nfctinfo = ctinfo;
+		nf_ct_set(nskb, (struct nf_conn *)nfct, ctinfo);
 		nf_conntrack_get(nfct);
 	}
 
···
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
-			  niph, nth, tcp_hdr_size);
+	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+			  IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
 }
 
 static void
···
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
-			  niph, nth, tcp_hdr_size);
+	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+			  IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
 }
 
 static bool

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

···
 /* Returns conntrack if it dealt with ICMP, and filled in skb fields */
 static int
 icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
-		 enum ip_conntrack_info *ctinfo,
 		 unsigned int hooknum)
 {
 	struct nf_conntrack_tuple innertuple, origtuple;
 	const struct nf_conntrack_l4proto *innerproto;
 	const struct nf_conntrack_tuple_hash *h;
 	const struct nf_conntrack_zone *zone;
+	enum ip_conntrack_info ctinfo;
 	struct nf_conntrack_zone tmp;
 
-	NF_CT_ASSERT(skb->nfct == NULL);
+	NF_CT_ASSERT(!skb_nfct(skb));
 	zone = nf_ct_zone_tmpl(tmpl, skb, &tmp);
 
 	/* Are they talking about one of our connections? */
···
 		return -NF_ACCEPT;
 	}
 
-	*ctinfo = IP_CT_RELATED;
+	ctinfo = IP_CT_RELATED;
 
 	h = nf_conntrack_find_get(net, zone, &innertuple);
 	if (!h) {
···
 	}
 
 	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
-		*ctinfo += IP_CT_IS_REPLY;
+		ctinfo += IP_CT_IS_REPLY;
 
 	/* Update skb to refer to this connection */
-	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
-	skb->nfctinfo = *ctinfo;
+	nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
 	return NF_ACCEPT;
 }
 
···
 static int
 icmp_error(struct net *net, struct nf_conn *tmpl,
 	   struct sk_buff *skb, unsigned int dataoff,
-	   enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
+	   u8 pf, unsigned int hooknum)
 {
 	const struct icmphdr *icmph;
 	struct icmphdr _ih;
···
 	    icmph->type != ICMP_REDIRECT)
 		return NF_ACCEPT;
 
-	return icmp_error_message(net, tmpl, skb, ctinfo, hooknum);
+	return icmp_error_message(net, tmpl, skb, hooknum);
 }
 
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)

net/ipv4/netfilter/nf_defrag_ipv4.c

···
 {
 	u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	if (skb->nfct) {
+	if (skb_nfct(skb)) {
 		enum ip_conntrack_info ctinfo;
 		const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 
···
 #if !IS_ENABLED(CONFIG_NF_NAT)
 	/* Previously seen (loopback)?  Ignore.  Do this before
 	   fragment check. */
-	if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
+	if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
 		return NF_ACCEPT;
 #endif
 #endif

net/ipv4/netfilter/nf_dup_ipv4.c

···
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 	/* Avoid counting cloned packets towards the original connection. */
-	nf_conntrack_put(skb->nfct);
-	skb->nfct     = &nf_ct_untracked_get()->ct_general;
-	skb->nfctinfo = IP_CT_NEW;
-	nf_conntrack_get(skb->nfct);
+	nf_reset(skb);
+	nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
+	nf_conntrack_get(skb_nfct(skb));
 #endif
 	/*
 	 * If we are in PREROUTING/INPUT, decrease the TTL to mitigate potential

net/ipv4/netfilter/nf_log_arp.c

···
 	struct nf_log_buf *m;
 
 	/* FIXME: Disabled from containers until syslog ns is supported */
-	if (!net_eq(net, &init_net))
+	if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
 		return;
 
 	m = nf_log_buf_open();

net/ipv4/netfilter/nf_log_ipv4.c

···
 	struct nf_log_buf *m;
 
 	/* FIXME: Disabled from containers until syslog ns is supported */
-	if (!net_eq(net, &init_net))
+	if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
 		return;
 
 	m = nf_log_buf_open();

net/ipv6/netfilter/ip6_tables.c

···
 		return PTR_ERR(counters);
 
 	loc_cpu_entry = private->entries;
-	if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
-		ret = -EFAULT;
-		goto free_counters;
-	}
 
 	/* FIXME: use iterator macros --RR */
 	/* ... then go back and fix counters and names */
···
 		const struct xt_entry_target *t;
 
 		e = (struct ip6t_entry *)(loc_cpu_entry + off);
+		if (copy_to_user(userptr + off, e, sizeof(*e))) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
 		if (copy_to_user(userptr + off
 				 + offsetof(struct ip6t_entry, counters),
 				 &counters[num],
···
 		     i += m->u.match_size) {
 			m = (void *)e + i;
 
-			if (copy_to_user(userptr + off + i
-					 + offsetof(struct xt_entry_match,
-						    u.user.name),
-					 m->u.kernel.match->name,
-					 strlen(m->u.kernel.match->name)+1)
-			    != 0) {
+			if (xt_match_to_user(m, userptr + off + i)) {
 				ret = -EFAULT;
 				goto free_counters;
 			}
 		}
 
 		t = ip6t_get_target_c(e);
-		if (copy_to_user(userptr + off + e->target_offset
-				 + offsetof(struct xt_entry_target,
-					    u.user.name),
-				 t->u.kernel.target->name,
-				 strlen(t->u.kernel.target->name)+1) != 0) {
+		if (xt_target_to_user(t, userptr + off + e->target_offset)) {
 			ret = -EFAULT;
 			goto free_counters;
 		}

net/ipv6/netfilter/ip6t_NPT.c

···
 		.table		= "mangle",
 		.target		= ip6t_snpt_tg,
 		.targetsize	= sizeof(struct ip6t_npt_tginfo),
+		.usersize	= offsetof(struct ip6t_npt_tginfo, adjustment),
 		.checkentry	= ip6t_npt_checkentry,
 		.family		= NFPROTO_IPV6,
 		.hooks		= (1 << NF_INET_LOCAL_IN) |
···
 		.table		= "mangle",
 		.target		= ip6t_dnpt_tg,
 		.targetsize	= sizeof(struct ip6t_npt_tginfo),
+		.usersize	= offsetof(struct ip6t_npt_tginfo, adjustment),
 		.checkentry	= ip6t_npt_checkentry,
 		.family		= NFPROTO_IPV6,
 		.hooks		= (1 << NF_INET_PRE_ROUTING) |

net/ipv6/netfilter/ip6t_SYNPROXY.c

···
 	skb_dst_set(nskb, dst);
 
 	if (nfct) {
-		nskb->nfct = nfct;
-		nskb->nfctinfo = ctinfo;
+		nf_ct_set(nskb, (struct nf_conn *)nfct, ctinfo);
 		nf_conntrack_get(nfct);
 	}
 
···
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
-			  niph, nth, tcp_hdr_size);
+	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+			  IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
 }
 
 static void
···
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(net, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
-			  niph, nth, tcp_hdr_size);
+	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
+			  IP_CT_ESTABLISHED_REPLY, niph, nth, tcp_hdr_size);
 }
 
 static bool

net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c

···
 icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
 		     struct sk_buff *skb,
 		     unsigned int icmp6off,
-		     enum ip_conntrack_info *ctinfo,
 		     unsigned int hooknum)
 {
 	struct nf_conntrack_tuple intuple, origtuple;
 	const struct nf_conntrack_tuple_hash *h;
 	const struct nf_conntrack_l4proto *inproto;
+	enum ip_conntrack_info ctinfo;
 	struct nf_conntrack_zone tmp;
 
-	NF_CT_ASSERT(skb->nfct == NULL);
+	NF_CT_ASSERT(!skb_nfct(skb));
 
 	/* Are they talking about one of our connections? */
 	if (!nf_ct_get_tuplepr(skb,
···
 		return -NF_ACCEPT;
 	}
 
-	*ctinfo = IP_CT_RELATED;
+	ctinfo = IP_CT_RELATED;
 
 	h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
 				  &intuple);
···
 		return -NF_ACCEPT;
 	} else {
 		if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
-			*ctinfo += IP_CT_IS_REPLY;
+			ctinfo += IP_CT_IS_REPLY;
 	}
 
 	/* Update skb to refer to this connection */
-	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
-	skb->nfctinfo = *ctinfo;
+	nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
 	return NF_ACCEPT;
 }
 
 static int
 icmpv6_error(struct net *net, struct nf_conn *tmpl,
 	     struct sk_buff *skb, unsigned int dataoff,
-	     enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
+	     u8 pf, unsigned int hooknum)
 {
 	const struct icmp6hdr *icmp6h;
 	struct icmp6hdr _ih;
···
 	type = icmp6h->icmp6_type - 130;
 	if (type >= 0 && type < sizeof(noct_valid_new) &&
 	    noct_valid_new[type]) {
-		skb->nfct = &nf_ct_untracked_get()->ct_general;
-		skb->nfctinfo = IP_CT_NEW;
-		nf_conntrack_get(skb->nfct);
+		nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
+		nf_conntrack_get(skb_nfct(skb));
 		return NF_ACCEPT;
 	}
 
···
 	if (icmp6h->icmp6_type >= 128)
 		return NF_ACCEPT;
 
-	return icmpv6_error_message(net, tmpl, skb, dataoff, ctinfo, hooknum);
+	return icmpv6_error_message(net, tmpl, skb, dataoff, hooknum);
 }
 
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)

net/ipv6/netfilter/nf_defrag_ipv6_hooks.c

···
 {
 	u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	if (skb->nfct) {
+	if (skb_nfct(skb)) {
 		enum ip_conntrack_info ctinfo;
 		const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 
···
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 	/* Previously seen (loopback)?	*/
-	if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
+	if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
 		return NF_ACCEPT;
 #endif
 

net/ipv6/netfilter/nf_dup_ipv6.c

···
 		return;
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	nf_conntrack_put(skb->nfct);
-	skb->nfct     = &nf_ct_untracked_get()->ct_general;
-	skb->nfctinfo = IP_CT_NEW;
-	nf_conntrack_get(skb->nfct);
+	nf_reset(skb);
+	nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
+	nf_conntrack_get(skb_nfct(skb));
 #endif
 	if (hooknum == NF_INET_PRE_ROUTING ||
 	    hooknum == NF_INET_LOCAL_IN) {

net/ipv6/netfilter/nf_log_ipv6.c

···
 	struct nf_log_buf *m;
 
 	/* FIXME: Disabled from containers until syslog ns is supported */
-	if (!net_eq(net, &init_net))
+	if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
 		return;
 
 	m = nf_log_buf_open();

net/netfilter/Kconfig

···
 	bool 'SCTP protocol connection tracking support'
 	depends on NETFILTER_ADVANCED
 	default y
+	select LIBCRC32C
 	help
 	  With this option enabled, the layer 3 independent connection
 	  tracking code will be able to do state tracking on SCTP connections.
···
 	bool
 	default NF_NAT && NF_CT_PROTO_SCTP
 	depends on NF_NAT && NF_CT_PROTO_SCTP
-	select LIBCRC32C
 
 config NF_NAT_AMANDA
 	tristate

net/netfilter/Makefile

···
 nf_conntrack-$(CONFIG_NF_CONNTRACK_LABELS) += nf_conntrack_labels.o
 nf_conntrack-$(CONFIG_NF_CT_PROTO_DCCP) += nf_conntrack_proto_dccp.o
 nf_conntrack-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
-nf_conntrack-$(CONFIG_NF_CT_PROTO_UDPLITE) += nf_conntrack_proto_udplite.o
 
 obj-$(CONFIG_NETFILTER) = netfilter.o
 
···
 # NAT protocols (nf_nat)
 nf_nat-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
 nf_nat-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
-nf_nat-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
 
 # generic transport layer logging
 obj-$(CONFIG_NF_LOG_COMMON) += nf_log_common.o

net/netfilter/core.c

···
 {
 	void (*attach)(struct sk_buff *, const struct sk_buff *);
 
-	if (skb->nfct) {
+	if (skb->_nfct) {
 		rcu_read_lock();
 		attach = rcu_dereference(ip_ct_attach);
 		if (attach)

net/netfilter/ipvs/ip_vs_ctl.c

···
 		      dest->vport == svc->port))) {
 			/* HIT */
 			list_del(&dest->t_list);
-			ip_vs_dest_hold(dest);
 			goto out;
 		}
 	}
···
  *  When the ip_vs_control_clearup is activated by ipvs module exit,
  *  the service tables must have been flushed and all the connections
  *  are expired, and the refcnt of each destination in the trash must
- *  be 0, so we simply release them here.
+ *  be 1, so we simply release them here.
  */
 static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
 {
···
 	if (list_empty(&ipvs->dest_trash) && !cleanup)
 		mod_timer(&ipvs->dest_trash_timer,
 			  jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
-	/* dest lives in trash without reference */
+	/* dest lives in trash with reference */
 	list_add(&dest->t_list, &ipvs->dest_trash);
 	dest->idle_start = 0;
 	spin_unlock_bh(&ipvs->dest_trash_lock);
-	ip_vs_dest_put(dest);
 }
 
 
···
 
 	spin_lock(&ipvs->dest_trash_lock);
 	list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
-		if (atomic_read(&dest->refcnt) > 0)
+		if (atomic_read(&dest->refcnt) > 1)
 			continue;
 		if (dest->idle_start) {
 			if (time_before(now, dest->idle_start +

net/netfilter/nf_conntrack_core.c

···
 	spin_unlock(&pcpu->lock);
 }
 
+#define NFCT_ALIGN(len)	(((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK)
+
 /* Released via destroy_conntrack() */
 struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
 				 const struct nf_conntrack_zone *zone,
 				 gfp_t flags)
 {
-	struct nf_conn *tmpl;
+	struct nf_conn *tmpl, *p;
 
-	tmpl = kzalloc(sizeof(*tmpl), flags);
-	if (tmpl == NULL)
-		return NULL;
+	if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) {
+		tmpl = kzalloc(sizeof(*tmpl) + NFCT_INFOMASK, flags);
+		if (!tmpl)
+			return NULL;
+
+		p = tmpl;
+		tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
+		if (tmpl != p) {
+			tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
+			tmpl->proto.tmpl_padto = (char *)tmpl - (char *)p;
+		}
+	} else {
+		tmpl = kzalloc(sizeof(*tmpl), flags);
+		if (!tmpl)
+			return NULL;
+	}
 
 	tmpl->status = IPS_TEMPLATE;
 	write_pnet(&tmpl->ct_net, net);
···
 {
 	nf_ct_ext_destroy(tmpl);
 	nf_ct_ext_free(tmpl);
-	kfree(tmpl);
+
+	if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK)
+		kfree((char *)tmpl - tmpl->proto.tmpl_padto);
+	else
+		kfree(tmpl);
 }
 EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);
 
···
 	    !nfct_nat(ct) &&
 	    !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;
+		enum ip_conntrack_info oldinfo;
+		struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo);
+
+		nf_ct_acct_merge(ct, ctinfo, loser_ct);
+		nf_conntrack_put(&loser_ct->ct_general);
+		nf_ct_set(skb, ct, oldinfo);
 		return NF_ACCEPT;
 	}
 	NF_CT_STAT_INC(net, drop);
···
 	return &ct->tuplehash[IP_CT_DIR_ORIGINAL];
 }
 
-/* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
+/* On success, returns conntrack ptr, sets skb->_nfct | ctinfo */
 static inline struct nf_conn *
 resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
 		  struct sk_buff *skb,
···
 		}
 		*set_reply = 0;
 	}
-	skb->nfct = &ct->ct_general;
-	skb->nfctinfo = *ctinfo;
+	nf_ct_set(skb, ct, *ctinfo);
 	return ct;
 }
 
···
 nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
 		struct sk_buff *skb)
 {
-	struct nf_conn *ct, *tmpl = NULL;
+	struct nf_conn *ct, *tmpl;
 	enum ip_conntrack_info ctinfo;
 	struct nf_conntrack_l3proto *l3proto;
 	struct nf_conntrack_l4proto *l4proto;
···
 	int set_reply = 0;
 	int ret;
 
-	if (skb->nfct) {
+	tmpl = nf_ct_get(skb, &ctinfo);
+	if (tmpl) {
 		/* Previously seen (loopback or untracked)?  Ignore. */
-		tmpl = (struct nf_conn *)skb->nfct;
 		if (!nf_ct_is_template(tmpl)) {
 			NF_CT_STAT_INC_ATOMIC(net, ignore);
 			return NF_ACCEPT;
 		}
-		skb->nfct = NULL;
+		skb->_nfct = 0;
 	}
 
 	/* rcu_read_lock()ed by nf_hook_thresh */
···
 	 * inverse of the return code tells to the netfilter
 	 * core what to do with the packet. */
 	if (l4proto->error != NULL) {
-		ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo,
-				     pf, hooknum);
+		ret = l4proto->error(net, tmpl, skb, dataoff, pf, hooknum);
 		if (ret <= 0) {
 			NF_CT_STAT_INC_ATOMIC(net, error);
 			NF_CT_STAT_INC_ATOMIC(net, invalid);
···
 			goto out;
 		}
 		/* ICMP[v6] protocol trackers may assign one conntrack. */
-		if (skb->nfct)
+		if (skb->_nfct)
 			goto out;
 	}
 repeat:
···
 		goto out;
 	}
 
-	NF_CT_ASSERT(skb->nfct);
+	NF_CT_ASSERT(skb_nfct(skb));
 
 	/* Decide what timeout policy we want to apply to this flow. */
 	timeouts = nf_ct_timeout_lookup(net, ct, l4proto);
···
 		/* Invalid: inverse of the return code tells
 		 * the netfilter core what to do */
 		pr_debug("nf_conntrack_in: Can't track with proto module\n");
-		nf_conntrack_put(skb->nfct);
-		skb->nfct = NULL;
+		nf_conntrack_put(&ct->ct_general);
+		skb->_nfct = 0;
 		NF_CT_STAT_INC_ATOMIC(net, invalid);
 		if (ret == -NF_DROP)
 			NF_CT_STAT_INC_ATOMIC(net, drop);
···
 		ctinfo = IP_CT_RELATED;
 
 	/* Attach to new skbuff, and increment count */
-	nskb->nfct = &ct->ct_general;
-	nskb->nfctinfo = ctinfo;
-	nf_conntrack_get(nskb->nfct);
+	nf_ct_set(nskb, ct, ctinfo);
+	nf_conntrack_get(skb_nfct(nskb));
 }
 
 /* Bring out ya dead! */
···
 	nf_conntrack_max = max_factor * nf_conntrack_htable_size;
 
 	nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
-						sizeof(struct nf_conn), 0,
+						sizeof(struct nf_conn),
+						NFCT_INFOMASK + 1,
 						SLAB_DESTROY_BY_RCU | SLAB_HWCACHE_ALIGN, NULL);
 	if (!nf_conntrack_cachep)
 		goto err_cachep;

net/netfilter/nf_conntrack_proto_dccp.c

···
 
 static int dccp_error(struct net *net, struct nf_conn *tmpl,
 		      struct sk_buff *skb, unsigned int dataoff,
-		      enum ip_conntrack_info *ctinfo,
 		      u_int8_t pf, unsigned int hooknum)
 {
 	struct dccp_hdr _dh, *dh;

net/netfilter/nf_conntrack_proto_sctp.c

···
 #include <linux/seq_file.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
+#include <net/sctp/checksum.h>
 
+#include <net/netfilter/nf_log.h>
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_l4proto.h>
 #include <net/netfilter/nf_conntrack_ecache.h>
···
 	return true;
 }
 
+static int sctp_error(struct net *net, struct nf_conn *tpl, struct sk_buff *skb,
+		      unsigned int dataoff,
+		      u8 pf, unsigned int hooknum)
+{
+	const struct sctphdr *sh;
+	struct sctphdr _sctph;
+	const char *logmsg;
+
+	sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
+	if (!sh) {
+		logmsg = "nf_ct_sctp: short packet ";
+		goto out_invalid;
+	}
+	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
+	    skb->ip_summed == CHECKSUM_NONE) {
+		if (sh->checksum != sctp_compute_cksum(skb, dataoff)) {
+			logmsg = "nf_ct_sctp: bad CRC ";
+			goto out_invalid;
+		}
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+	return NF_ACCEPT;
+out_invalid:
+	if (LOG_INVALID(net, IPPROTO_SCTP))
+		nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", logmsg);
+	return -NF_ACCEPT;
+}
+
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 
 #include <linux/netfilter/nfnetlink.h>
···
 	.packet 		= sctp_packet,
 	.get_timeouts		= sctp_get_timeouts,
 	.new 			= sctp_new,
+	.error			= sctp_error,
 	.me 			= THIS_MODULE,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 	.to_nlattr		= sctp_to_nlattr,
···
 	.packet 		= sctp_packet,
 	.get_timeouts		= sctp_get_timeouts,
 	.new 			= sctp_new,
+	.error			= sctp_error,
 	.me 			= THIS_MODULE,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 	.to_nlattr		= sctp_to_nlattr,

net/netfilter/nf_conntrack_proto_tcp.c

···
 static int tcp_error(struct net *net, struct nf_conn *tmpl,
 		     struct sk_buff *skb,
 		     unsigned int dataoff,
-		     enum ip_conntrack_info *ctinfo,
 		     u_int8_t pf,
 		     unsigned int hooknum)
 {

net/netfilter/nf_conntrack_proto_udp.c

···
 	return true;
 }
 
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+static int udplite_error(struct net *net, struct nf_conn *tmpl,
+			 struct sk_buff *skb,
+			 unsigned int dataoff,
+			 u8 pf, unsigned int hooknum)
+{
+	unsigned int udplen = skb->len - dataoff;
+	const struct udphdr *hdr;
+	struct udphdr _hdr;
+	unsigned int cscov;
+
+	/* Header is too small? */
+	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
+	if (!hdr) {
+		if (LOG_INVALID(net, IPPROTO_UDPLITE))
+			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
+				      "nf_ct_udplite: short packet ");
+		return -NF_ACCEPT;
+	}
+
+	cscov = ntohs(hdr->len);
+	if (cscov == 0) {
+		cscov = udplen;
+	} else if (cscov < sizeof(*hdr) || cscov > udplen) {
+		if (LOG_INVALID(net, IPPROTO_UDPLITE))
+			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
+				      "nf_ct_udplite: invalid checksum coverage ");
+		return -NF_ACCEPT;
+	}
+
+	/* UDPLITE mandates checksums */
+	if (!hdr->check) {
+		if (LOG_INVALID(net, IPPROTO_UDPLITE))
+			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
+				      "nf_ct_udplite: checksum missing ");
+		return -NF_ACCEPT;
+	}
+
+	/* Checksum invalid? Ignore. */
+	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
+	    nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
+				pf)) {
+		if (LOG_INVALID(net, IPPROTO_UDPLITE))
+			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
+				      "nf_ct_udplite: bad UDPLite checksum ");
+		return -NF_ACCEPT;
+	}
+
+	return NF_ACCEPT;
+}
+#endif
+
 static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
-		     unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+		     unsigned int dataoff,
 		     u_int8_t pf,
 		     unsigned int hooknum)
 {
···
 };
 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
 
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
+{
+	.l3proto		= PF_INET,
+	.l4proto		= IPPROTO_UDPLITE,
+	.name			= "udplite",
+	.allow_clash		= true,
+	.pkt_to_tuple		= udp_pkt_to_tuple,
+	.invert_tuple		= udp_invert_tuple,
+	.print_tuple		= udp_print_tuple,
+	.packet			= udp_packet,
+	.get_timeouts		= udp_get_timeouts,
+	.new			= udp_new,
+	.error			= udplite_error,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
+	.nla_policy		= nf_ct_port_nla_policy,
+#endif
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
+	.ctnl_timeout		= {
+		.nlattr_to_obj	= udp_timeout_nlattr_to_obj,
+		.obj_to_nlattr	= udp_timeout_obj_to_nlattr,
+		.nlattr_max	= CTA_TIMEOUT_UDP_MAX,
+		.obj_size	= sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
+		.nla_policy	= udp_timeout_nla_policy,
+	},
+#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
+	.init_net		= udp_init_net,
+	.get_net_proto		= udp_get_net_proto,
+};
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite4);
+#endif
+
 struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
 {
 	.l3proto		= PF_INET6,
···
 	.get_net_proto		= udp_get_net_proto,
 };
 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);
+
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
+{
+	.l3proto		= PF_INET6,
+	.l4proto		= IPPROTO_UDPLITE,
+	.name			= "udplite",
+	.allow_clash		= true,
+	.pkt_to_tuple		= udp_pkt_to_tuple,
+	.invert_tuple		= udp_invert_tuple,
+	.print_tuple		= udp_print_tuple,
+	.packet			= udp_packet,
+	.get_timeouts		= udp_get_timeouts,
+	.new			= udp_new,
+	.error			= udplite_error,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
+	.nla_policy		= nf_ct_port_nla_policy,
+#endif
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
+	.ctnl_timeout		= {
+		.nlattr_to_obj	= udp_timeout_nlattr_to_obj,
+		.obj_to_nlattr	= udp_timeout_obj_to_nlattr,
+		.nlattr_max	= CTA_TIMEOUT_UDP_MAX,
+		.obj_size	= sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX,
+		.nla_policy	= udp_timeout_nla_policy,
+	},
+#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
+	.init_net		= udp_init_net,
+	.get_net_proto		= udp_get_net_proto,
+};
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite6);
+#endif

net/netfilter/nf_conntrack_proto_udplite.c

···
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <[e-mail]>
- * (C) 2007 Patrick McHardy <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/udp.h>
-#include <linux/seq_file.h>
-#include <linux/skbuff.h>
-#include <linux/ipv6.h>
-#include <net/ip6_checksum.h>
-#include <net/checksum.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv6.h>
-#include <net/netfilter/nf_conntrack_l4proto.h>
-#include <net/netfilter/nf_conntrack_ecache.h>
-#include <net/netfilter/nf_log.h>
-
-static unsigned int udplite_timeouts[UDPLITE_CT_MAX] = {
-	[UDPLITE_CT_UNREPLIED]	= 30*HZ,
-	[UDPLITE_CT_REPLIED]	= 180*HZ,
-};
-
-static inline struct nf_udplite_net *udplite_pernet(struct net *net)
-{
-	return &net->ct.nf_ct_proto.udplite;
-}
-
-static bool udplite_pkt_to_tuple(const struct sk_buff *skb,
-				 unsigned int dataoff,
-				 struct net *net,
-				 struct nf_conntrack_tuple *tuple)
-{
-	const struct udphdr *hp;
-	struct udphdr _hdr;
-
-	/* Actually only need first 4 bytes to get ports. */
-	hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
-	if (hp == NULL)
-		return false;
-
-	tuple->src.u.udp.port = hp->source;
-	tuple->dst.u.udp.port = hp->dest;
-	return true;
-}
-
-static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple,
-				 const struct nf_conntrack_tuple *orig)
-{
-	tuple->src.u.udp.port = orig->dst.u.udp.port;
-	tuple->dst.u.udp.port = orig->src.u.udp.port;
-	return true;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static void udplite_print_tuple(struct seq_file *s,
-				const struct nf_conntrack_tuple *tuple)
-{
-	seq_printf(s, "sport=%hu dport=%hu ",
-		   ntohs(tuple->src.u.udp.port),
-		   ntohs(tuple->dst.u.udp.port));
-}
-
-static unsigned int *udplite_get_timeouts(struct net *net)
-{
-	return udplite_pernet(net)->timeouts;
-}
-
-/* Returns verdict for packet, and may modify conntracktype */
-static int udplite_packet(struct nf_conn *ct,
-			  const struct sk_buff *skb,
-			  unsigned int dataoff,
-			  enum ip_conntrack_info ctinfo,
-			  u_int8_t pf,
-			  unsigned int hooknum,
-			  unsigned int *timeouts)
-{
-	/* If we've seen traffic both ways, this is some kind of UDP
-	   stream.  Extend timeout. */
-	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
-		nf_ct_refresh_acct(ct, ctinfo, skb,
-				   timeouts[UDPLITE_CT_REPLIED]);
-		/* Also, more likely to be important, and not a probe */
-		if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
-			nf_conntrack_event_cache(IPCT_ASSURED, ct);
-	} else {
-		nf_ct_refresh_acct(ct, ctinfo, skb,
-				   timeouts[UDPLITE_CT_UNREPLIED]);
-	}
-	return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb,
-			unsigned int dataoff, unsigned int *timeouts)
-{
-	return true;
-}
-
-static int udplite_error(struct net *net, struct nf_conn *tmpl,
-			 struct sk_buff *skb,
-			 unsigned int dataoff,
-			 enum ip_conntrack_info *ctinfo,
-			 u_int8_t pf,
-			 unsigned int hooknum)
-{
-	unsigned int udplen = skb->len - dataoff;
-	const struct udphdr *hdr;
-	struct udphdr _hdr;
-	unsigned int cscov;
-
-	/* Header is too small? */
-	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
-	if (hdr == NULL) {
-		if (LOG_INVALID(net, IPPROTO_UDPLITE))
-			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
-				      "nf_ct_udplite: short packet ");
-		return -NF_ACCEPT;
-	}
-
-	cscov = ntohs(hdr->len);
-	if (cscov == 0)
-		cscov = udplen;
-	else if (cscov < sizeof(*hdr) || cscov > udplen) {
-		if (LOG_INVALID(net, IPPROTO_UDPLITE))
-			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
-				"nf_ct_udplite: invalid checksum coverage ");
-		return -NF_ACCEPT;
-	}
-
-	/* UDPLITE mandates checksums */
-	if (!hdr->check) {
-		if (LOG_INVALID(net, IPPROTO_UDPLITE))
-			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
-				      "nf_ct_udplite: checksum missing ");
-		return -NF_ACCEPT;
-	}
-
-	/* Checksum invalid? Ignore. */
-	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
-	    nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
-	    			pf)) {
-		if (LOG_INVALID(net, IPPROTO_UDPLITE))
-			nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
-				      "nf_ct_udplite: bad UDPLite checksum ");
-		return -NF_ACCEPT;
-	}
-
-	return NF_ACCEPT;
-}
-
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
-
-#include <linux/netfilter/nfnetlink.h>
-#include <linux/netfilter/nfnetlink_cttimeout.h>
-
-static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[],
-					 struct net *net, void *data)
-{
-	unsigned int *timeouts = data;
-	struct nf_udplite_net *un = udplite_pernet(net);
-
-	/* set default timeouts for UDPlite. */
-	timeouts[UDPLITE_CT_UNREPLIED] = un->timeouts[UDPLITE_CT_UNREPLIED];
-	timeouts[UDPLITE_CT_REPLIED] = un->timeouts[UDPLITE_CT_REPLIED];
-
-	if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) {
-		timeouts[UDPLITE_CT_UNREPLIED] =
-		  ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ;
-	}
-	if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) {
-		timeouts[UDPLITE_CT_REPLIED] =
-		  ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ;
-	}
-	return 0;
-}
-
-static int
-udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
-{
-	const unsigned int *timeouts = data;
-
-	if (nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED,
-			 htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)) ||
-	    nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_REPLIED,
-			 htonl(timeouts[UDPLITE_CT_REPLIED] / HZ)))
-		goto nla_put_failure;
-	return 0;
-
-nla_put_failure:
-	return -ENOSPC;
-}
-
-static const struct nla_policy
-udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = {
-	[CTA_TIMEOUT_UDPLITE_UNREPLIED]	= { .type = NLA_U32 },
-	[CTA_TIMEOUT_UDPLITE_REPLIED]	= { .type = NLA_U32 },
-};
-#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table udplite_sysctl_table[] = {
-	{
-		.procname	= "nf_conntrack_udplite_timeout",
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_jiffies,
-	},
-	{
-		.procname	= "nf_conntrack_udplite_timeout_stream",
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_jiffies,
-	},
-	{ }
-};
-#endif /* CONFIG_SYSCTL */
-
-static int udplite_kmemdup_sysctl_table(struct nf_proto_net *pn,
-					struct nf_udplite_net *un)
-{
-#ifdef CONFIG_SYSCTL
-	if (pn->ctl_table)
-		return 0;
-
-	pn->ctl_table = kmemdup(udplite_sysctl_table,
-				sizeof(udplite_sysctl_table),
-				GFP_KERNEL);
-	if (!pn->ctl_table)
-		return -ENOMEM;
-
-	pn->ctl_table[0].data = &un->timeouts[UDPLITE_CT_UNREPLIED];
-	pn->ctl_table[1].data = &un->timeouts[UDPLITE_CT_REPLIED];
-#endif
-	return 0;
-}
-
-static int udplite_init_net(struct net *net, u_int16_t proto)
-{
-	struct nf_udplite_net *un = udplite_pernet(net);
-	struct nf_proto_net *pn = &un->pn;
-
-	if (!pn->users) {
-		int i;
-
-		for (i = 0 ; i < UDPLITE_CT_MAX; i++)
-			un->timeouts[i] = udplite_timeouts[i];
-	}
-
-	return udplite_kmemdup_sysctl_table(pn, un);
-}
-
-struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
-{
-	.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,
-	.packet			= udplite_packet,
-	.get_timeouts		= udplite_get_timeouts,
-	.new			= udplite_new,
-	.error			= udplite_error,
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
-	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
-	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
-	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
-	.nla_policy		= nf_ct_port_nla_policy,
-#endif
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
-	.ctnl_timeout		= {
-		.nlattr_to_obj	= udplite_timeout_nlattr_to_obj,
-		.obj_to_nlattr	= udplite_timeout_obj_to_nlattr,
-		.nlattr_max	= CTA_TIMEOUT_UDPLITE_MAX,
-		.obj_size	= sizeof(unsigned int) *
-					CTA_TIMEOUT_UDPLITE_MAX,
-		.nla_policy	= udplite_timeout_nla_policy,
-	},
-#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
-	.init_net		= udplite_init_net,
-};
-EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite4);
-
-struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
-{
-	.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,
-	.packet			= udplite_packet,
-	.get_timeouts		= udplite_get_timeouts,
-	.new			= udplite_new,
-	.error			= udplite_error,
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
-	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
-	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
-	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
-	.nla_policy		= nf_ct_port_nla_policy,
-#endif
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
-	.ctnl_timeout		= {
-		.nlattr_to_obj	= udplite_timeout_nlattr_to_obj,
-		.obj_to_nlattr	= udplite_timeout_obj_to_nlattr,
-		.nlattr_max	= CTA_TIMEOUT_UDPLITE_MAX,
-		.obj_size	= sizeof(unsigned int) *
-					CTA_TIMEOUT_UDPLITE_MAX,
-		.nla_policy	= udplite_timeout_nla_policy,
-	},
-#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
-	.init_net		= udplite_init_net,
-};
-EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite6);

net/netfilter/nf_conntrack_standalone.c

···
 	if (ret < 0)
 		goto out_start;
 
+	BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
+	BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
+
 #ifdef CONFIG_SYSCTL
 	nf_ct_netfilter_header =
 		register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);

net/netfilter/nf_log.c

···
 
 #define NFLOGGER_NAME_LEN		64
 
+int sysctl_nf_log_all_netns __read_mostly;
+EXPORT_SYMBOL(sysctl_nf_log_all_netns);
+
 static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly;
 static DEFINE_MUTEX(nf_log_mutex);
 
···
 #ifdef CONFIG_SYSCTL
 static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
 static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
+static struct ctl_table_header *nf_log_sysctl_fhdr;
+
+static struct ctl_table nf_log_sysctl_ftable[] = {
+	{
+		.procname	= "nf_log_all_netns",
+		.data		= &sysctl_nf_log_all_netns,
+		.maxlen		= sizeof(sysctl_nf_log_all_netns),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{ }
+};
 
 static int nf_log_proc_dostring(struct ctl_table *table, int write,
 			 void __user *buffer, size_t *lenp, loff_t *ppos)
···
 			nf_log_sysctl_table[i].extra1 =
 				(void *)(unsigned long) i;
 		}
+		nf_log_sysctl_fhdr = register_net_sysctl(net, "net/netfilter",
+							 nf_log_sysctl_ftable);
+		if (!nf_log_sysctl_fhdr)
+			goto err_freg;
 	}
 
 	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
···
 err_reg:
 	if (!net_eq(net, &init_net))
 		kfree(table);
+	else
+		unregister_net_sysctl_table(nf_log_sysctl_fhdr);
+err_freg:
 err_alloc:
 	return -ENOMEM;
 }
···
 	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
 	if (!net_eq(net, &init_net))
 		kfree(table);
+	else
+		unregister_net_sysctl_table(nf_log_sysctl_fhdr);
 }
 #else
 static int netfilter_log_sysctl_init(struct net *net)

net/netfilter/nf_nat_helper.c

···
 		__skb_trim(skb, skb->len + rep_len - match_len);
 	}
 
-	if (nf_ct_l3num((struct nf_conn *)skb->nfct) == NFPROTO_IPV4) {
+	if (nf_ct_l3num((struct nf_conn *)skb_nfct(skb)) == NFPROTO_IPV4) {
 		/* fix IP hdr checksum information */
 		ip_hdr(skb)->tot_len = htons(skb->len);
 		ip_send_check(ip_hdr(skb));

net/netfilter/nf_nat_proto_udp.c

···
 				    &udp_port_rover);
 }
 
-static bool
-udp_manip_pkt(struct sk_buff *skb,
-	      const struct nf_nat_l3proto *l3proto,
-	      unsigned int iphdroff, unsigned int hdroff,
-	      const struct nf_conntrack_tuple *tuple,
-	      enum nf_nat_manip_type maniptype)
+static void
+__udp_manip_pkt(struct sk_buff *skb,
+	        const struct nf_nat_l3proto *l3proto,
+	        unsigned int iphdroff, struct udphdr *hdr,
+	        const struct nf_conntrack_tuple *tuple,
+	        enum nf_nat_manip_type maniptype, bool do_csum)
 {
-	struct udphdr *hdr;
 	__be16 *portptr, newport;
-
-	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
-		return false;
-	hdr = (struct udphdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
 		/* Get rid of src port */
···
 		newport = tuple->dst.u.udp.port;
 		portptr = &hdr->dest;
 	}
-	if (hdr->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+	if (do_csum) {
 		l3proto->csum_update(skb, iphdroff, &hdr->check,
 				     tuple, maniptype);
 		inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport,
···
 			hdr->check = CSUM_MANGLED_0;
 	}
 	*portptr = newport;
+}
+
+static bool udp_manip_pkt(struct sk_buff *skb,
+			  const struct nf_nat_l3proto *l3proto,
+			  unsigned int iphdroff, unsigned int hdroff,
+			  const struct nf_conntrack_tuple *tuple,
+			  enum nf_nat_manip_type maniptype)
+{
+	struct udphdr *hdr;
+	bool do_csum;
+
+	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
+		return false;
+
+	hdr = (struct udphdr *)(skb->data + hdroff);
+	do_csum = hdr->check || skb->ip_summed == CHECKSUM_PARTIAL;
+
+	__udp_manip_pkt(skb, l3proto, iphdroff, hdr, tuple, maniptype, do_csum);
 	return true;
 }
+
+#ifdef CONFIG_NF_NAT_PROTO_UDPLITE
+static u16 udplite_port_rover;
+
+static bool udplite_manip_pkt(struct sk_buff *skb,
+			      const struct nf_nat_l3proto *l3proto,
+			      unsigned int iphdroff, unsigned int hdroff,
+			      const struct nf_conntrack_tuple *tuple,
+			      enum nf_nat_manip_type maniptype)
+{
+	struct udphdr *hdr;
+
+	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
+		return false;
+
+	hdr = (struct udphdr *)(skb->data + hdroff);
+	__udp_manip_pkt(skb, l3proto, iphdroff, hdr, tuple, maniptype, true);
+	return true;
+}
+
+static void
+udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		     struct nf_conntrack_tuple *tuple,
+		     const struct nf_nat_range *range,
+		     enum nf_nat_manip_type maniptype,
+		     const struct nf_conn *ct)
+{
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &udplite_port_rover);
+}
+
+const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
+	.l4proto		= IPPROTO_UDPLITE,
+	.manip_pkt		= udplite_manip_pkt,
+	.in_range		= nf_nat_l4proto_in_range,
+	.unique_tuple		= udplite_unique_tuple,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
+#endif
+};
+#endif /* CONFIG_NF_NAT_PROTO_UDPLITE */
 
 const struct nf_nat_l4proto nf_nat_l4proto_udp = {
 	.l4proto		= IPPROTO_UDP,

net/netfilter/nf_nat_proto_udplite.c

···
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <[e-mail]>
- * (C) 2008 Patrick McHardy <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter.h>
-#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_l3proto.h>
-#include <net/netfilter/nf_nat_l4proto.h>
-
-static u16 udplite_port_rover;
-
-static void
-udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
-		     struct nf_conntrack_tuple *tuple,
-		     const struct nf_nat_range *range,
-		     enum nf_nat_manip_type maniptype,
-		     const struct nf_conn *ct)
-{
-	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
-				    &udplite_port_rover);
-}
-
-static bool
-udplite_manip_pkt(struct sk_buff *skb,
-		  const struct nf_nat_l3proto *l3proto,
-		  unsigned int iphdroff, unsigned int hdroff,
-		  const struct nf_conntrack_tuple *tuple,
-		  enum nf_nat_manip_type maniptype)
-{
-	struct udphdr *hdr;
-	__be16 *portptr, newport;
-
-	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
-		return false;
-
-	hdr = (struct udphdr *)(skb->data + hdroff);
-
-	if (maniptype == NF_NAT_MANIP_SRC) {
-		/* Get rid of source port */
-		newport = tuple->src.u.udp.port;
-		portptr = &hdr->source;
-	} else {
-		/* Get rid of dst port */
-		newport = tuple->dst.u.udp.port;
-		portptr = &hdr->dest;
-	}
-
-	l3proto->csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
-	inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, false);
-	if (!hdr->check)
-		hdr->check = CSUM_MANGLED_0;
-
-	*portptr = newport;
-	return true;
-}
-
-const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
-	.l4proto		= IPPROTO_UDPLITE,
-	.manip_pkt		= udplite_manip_pkt,
-	.in_range		= nf_nat_l4proto_in_range,
-	.unique_tuple		= udplite_unique_tuple,
-#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
-	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
-#endif
-};

net/netfilter/nf_tables_api.c

···
 	return err;
 }
 
+static void _nf_tables_table_disable(struct net *net,
+				     const struct nft_af_info *afi,
+				     struct nft_table *table,
+				     u32 cnt)
+{
+	struct nft_chain *chain;
+	u32 i = 0;
+
+	list_for_each_entry(chain, &table->chains, list) {
+		if (!nft_is_active_next(net, chain))
+			continue;
+		if (!(chain->flags & NFT_BASE_CHAIN))
+			continue;
+
+		if (cnt && i++ == cnt)
+			break;
+
+		nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
+					afi->nops);
+	}
+}
+
 static int nf_tables_table_enable(struct net *net,
 				  const struct nft_af_info *afi,
 				  struct nft_table *table)
···
 	}
 	return 0;
 err:
-	list_for_each_entry(chain, &table->chains, list) {
-		if (!nft_is_active_next(net, chain))
-			continue;
-		if (!(chain->flags & NFT_BASE_CHAIN))
-			continue;
-
-		if (i-- <= 0)
-			break;
-
-		nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
-					afi->nops);
-	}
+	if (i)
+		_nf_tables_table_disable(net, afi, table, i);
 	return err;
 }
 
···
 				    const struct nft_af_info *afi,
 				    struct nft_table *table)
 {
-	struct nft_chain *chain;
-
-	list_for_each_entry(chain, &table->chains, list) {
-		if (!nft_is_active_next(net, chain))
-			continue;
-		if (!(chain->flags & NFT_BASE_CHAIN))
-			continue;
-
-		nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
-					afi->nops);
-	}
+	_nf_tables_table_disable(net, afi, table, 0);
 }
 
 static int nf_tables_updtable(struct nft_ctx *ctx)
···
 	if (IS_ERR(table)) {
 		if (PTR_ERR(table) != -ENOENT)
 			return PTR_ERR(table);
-		table = NULL;
-	}
-
-	if (table != NULL) {
+	} else {
 		if (nlh->nlmsg_flags & NLM_F_EXCL)
 			return -EEXIST;
 		if (nlh->nlmsg_flags & NLM_F_REPLACE)
···
 	if (IS_ERR(set)) {
 		if (PTR_ERR(set) != -ENOENT)
 			return PTR_ERR(set);
-		set = NULL;
-	}
-
-	if (set != NULL) {
+	} else {
 		if (nlh->nlmsg_flags & NLM_F_EXCL)
 			return -EEXIST;
 		if (nlh->nlmsg_flags & NLM_F_REPLACE)
···
 		if (err != -ENOENT)
 			return err;
 
-		obj = NULL;
-	}
-
-	if (obj != NULL) {
+	} else {
 		if (nlh->nlmsg_flags & NLM_F_EXCL)
 			return -EEXIST;
 

net/netfilter/nft_ct.c

···
 		memcpy(dest, &count, sizeof(count));
 		return;
 	}
+	case NFT_CT_AVGPKT: {
+		const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
+		u64 avgcnt = 0, bcnt = 0, pcnt = 0;
+
+		if (acct) {
+			pcnt = nft_ct_get_eval_counter(acct->counter,
+						       NFT_CT_PKTS, priv->dir);
+			bcnt = nft_ct_get_eval_counter(acct->counter,
+						       NFT_CT_BYTES, priv->dir);
+			if (pcnt != 0)
+				avgcnt = div64_u64(bcnt, pcnt);
+		}
+
+		memcpy(dest, &avgcnt, sizeof(avgcnt));
+		return;
+	}
 	case NFT_CT_L3PROTOCOL:
 		*dest = nf_ct_l3num(ct);
 		return;
···
 		break;
 	case NFT_CT_BYTES:
 	case NFT_CT_PKTS:
+	case NFT_CT_AVGPKT:
 		/* no direction? return sum of original + reply */
 		if (tb[NFTA_CT_DIRECTION] == NULL)
 			priv->dir = IP_CT_DIR_MAX;
···
 	if (err < 0)
 		return err;
 
-	if (priv->key == NFT_CT_BYTES || priv->key == NFT_CT_PKTS)
+	if (priv->key == NFT_CT_BYTES ||
+	    priv->key == NFT_CT_PKTS  ||
+	    priv->key == NFT_CT_AVGPKT)
 		nf_ct_set_acct(ctx->net, true);
 
 	return 0;
···
 		break;
 	case NFT_CT_BYTES:
 	case NFT_CT_PKTS:
+	case NFT_CT_AVGPKT:
 		if (priv->dir < IP_CT_DIR_MAX &&
 		    nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
 			goto nla_put_failure;
···
 
 	ct = nf_ct_untracked_get();
 	atomic_inc(&ct->ct_general.use);
-	skb->nfct = &ct->ct_general;
-	skb->nfctinfo = IP_CT_NEW;
+	nf_ct_set(skb, ct, IP_CT_NEW);
 }
 
 static struct nft_expr_type nft_notrack_type;

net/netfilter/nft_meta.c

···
 				*dest = PACKET_BROADCAST;
 			break;
 		case NFPROTO_IPV6:
-			if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
+			*dest = PACKET_MULTICAST;
+			break;
+		case NFPROTO_NETDEV:
+			switch (skb->protocol) {
+			case htons(ETH_P_IP): {
+				int noff = skb_network_offset(skb);
+				struct iphdr *iph, _iph;
+
+				iph = skb_header_pointer(skb, noff,
+							 sizeof(_iph), &_iph);
+				if (!iph)
+					goto err;
+
+				if (ipv4_is_multicast(iph->daddr))
+					*dest = PACKET_MULTICAST;
+				else
+					*dest = PACKET_BROADCAST;
+
+				break;
+			}
+			case htons(ETH_P_IPV6):
 				*dest = PACKET_MULTICAST;
-			else
-				*dest = PACKET_BROADCAST;
+				break;
+			default:
+				WARN_ON_ONCE(1);
+				goto err;
+			}
 			break;
 		default:
-			WARN_ON(1);
+			WARN_ON_ONCE(1);
 			goto err;
 		}
 		break;

net/netfilter/x_tables.c

···
 }
 EXPORT_SYMBOL_GPL(xt_request_find_target);
 
+
+static int xt_obj_to_user(u16 __user *psize, u16 size,
+			  void __user *pname, const char *name,
+			  u8 __user *prev, u8 rev)
+{
+	if (put_user(size, psize))
+		return -EFAULT;
+	if (copy_to_user(pname, name, strlen(name) + 1))
+		return -EFAULT;
+	if (put_user(rev, prev))
+		return -EFAULT;
+
+	return 0;
+}
+
+#define XT_OBJ_TO_USER(U, K, TYPE, C_SIZE)				\
+	xt_obj_to_user(&U->u.TYPE##_size, C_SIZE ? : K->u.TYPE##_size,	\
+		       U->u.user.name, K->u.kernel.TYPE->name,		\
+		       &U->u.user.revision, K->u.kernel.TYPE->revision)
+
+int xt_data_to_user(void __user *dst, const void *src,
+		    int usersize, int size)
+{
+	usersize = usersize ? : size;
+	if (copy_to_user(dst, src, usersize))
+		return -EFAULT;
+	if (usersize != size && clear_user(dst + usersize, size - usersize))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xt_data_to_user);
+
+#define XT_DATA_TO_USER(U, K, TYPE, C_SIZE)				\
+	xt_data_to_user(U->data, K->data,				\
+			K->u.kernel.TYPE->usersize,			\
+			C_SIZE ? : K->u.kernel.TYPE->TYPE##size)
+
+int xt_match_to_user(const struct xt_entry_match *m,
+		     struct xt_entry_match __user *u)
+{
+	return XT_OBJ_TO_USER(u, m, match, 0) ||
+	       XT_DATA_TO_USER(u, m, match, 0);
+}
+EXPORT_SYMBOL_GPL(xt_match_to_user);
+
+int xt_target_to_user(const struct xt_entry_target *t,
+		      struct xt_entry_target __user *u)
+{
+	return XT_OBJ_TO_USER(u, t, target, 0) ||
+	       XT_DATA_TO_USER(u, t, target, 0);
+}
+EXPORT_SYMBOL_GPL(xt_target_to_user);
+
 static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
 {
 	const struct xt_match *m;
···
 	int off = xt_compat_match_offset(match);
 	u_int16_t msize = m->u.user.match_size - off;
 
-	if (copy_to_user(cm, m, sizeof(*cm)) ||
-	    put_user(msize, &cm->u.user.match_size) ||
-	    copy_to_user(cm->u.user.name, m->u.kernel.match->name,
-			 strlen(m->u.kernel.match->name) + 1))
+	if (XT_OBJ_TO_USER(cm, m, match, msize))
 		return -EFAULT;
 
 	if (match->compat_to_user) {
 		if (match->compat_to_user((void __user *)cm->data, m->data))
 			return -EFAULT;
 	} else {
-		if (copy_to_user(cm->data, m->data, msize - sizeof(*cm)))
+		if (XT_DATA_TO_USER(cm, m, match, msize - sizeof(*cm)))
 			return -EFAULT;
 	}
 
···
 	int off = xt_compat_target_offset(target);
 	u_int16_t tsize = t->u.user.target_size - off;
 
-	if (copy_to_user(ct, t, sizeof(*ct)) ||
-	    put_user(tsize, &ct->u.user.target_size) ||
-	    copy_to_user(ct->u.user.name, t->u.kernel.target->name,
-			 strlen(t->u.kernel.target->name) + 1))
+	if (XT_OBJ_TO_USER(ct, t, target, tsize))
 		return -EFAULT;
 
 	if (target->compat_to_user) {
 		if (target->compat_to_user((void __user *)ct->data, t->data))
 			return -EFAULT;
 	} else {
-		if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct)))
+		if (XT_DATA_TO_USER(ct, t, target, tsize - sizeof(*ct)))
 			return -EFAULT;
 	}
 

net/netfilter/xt_CT.c

···
 static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
 {
 	/* Previously seen (loopback)? Ignore. */
-	if (skb->nfct != NULL)
+	if (skb->_nfct != 0)
 		return XT_CONTINUE;
 
 	/* special case the untracked ct : we want the percpu object */
 	if (!ct)
 		ct = nf_ct_untracked_get();
 	atomic_inc(&ct->ct_general.use);
-	skb->nfct = &ct->ct_general;
-	skb->nfctinfo = IP_CT_NEW;
+	nf_ct_set(skb, ct, IP_CT_NEW);
 
 	return XT_CONTINUE;
 }
···
 		.name		= "CT",
 		.family		= NFPROTO_UNSPEC,
 		.targetsize	= sizeof(struct xt_ct_target_info),
+		.usersize	= offsetof(struct xt_ct_target_info, ct),
 		.checkentry	= xt_ct_tg_check_v0,
 		.destroy	= xt_ct_tg_destroy_v0,
 		.target		= xt_ct_target_v0,
···
 		.family		= NFPROTO_UNSPEC,
 		.revision	= 1,
 		.targetsize	= sizeof(struct xt_ct_target_info_v1),
+		.usersize	= offsetof(struct xt_ct_target_info, ct),
 		.checkentry	= xt_ct_tg_check_v1,
 		.destroy	= xt_ct_tg_destroy_v1,
 		.target		= xt_ct_target_v1,
···
 		.family		= NFPROTO_UNSPEC,
 		.revision	= 2,
 		.targetsize	= sizeof(struct xt_ct_target_info_v1),
+		.usersize	= offsetof(struct xt_ct_target_info, ct),
 		.checkentry	= xt_ct_tg_check_v2,
 		.destroy	= xt_ct_tg_destroy_v1,
 		.target		= xt_ct_target_v1,
···
 notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
 	/* Previously seen (loopback)? Ignore. */
-	if (skb->nfct != NULL)
+	if (skb->_nfct != 0)
 		return XT_CONTINUE;
 
-	skb->nfct = &nf_ct_untracked_get()->ct_general;
-	skb->nfctinfo = IP_CT_NEW;
-	nf_conntrack_get(skb->nfct);
+	nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
+	nf_conntrack_get(skb_nfct(skb));
 
 	return XT_CONTINUE;
 }

net/netfilter/xt_RATEEST.c

···
 	.checkentry = xt_rateest_tg_checkentry,
 	.destroy    = xt_rateest_tg_destroy,
 	.targetsize = sizeof(struct xt_rateest_target_info),
+	.usersize   = offsetof(struct xt_rateest_target_info, est),
 	.me         = THIS_MODULE,
 };
 

net/netfilter/xt_TEE.c

···
 		.family     = NFPROTO_IPV4,
 		.target     = tee_tg4,
 		.targetsize = sizeof(struct xt_tee_tginfo),
+		.usersize   = offsetof(struct xt_tee_tginfo, priv),
 		.checkentry = tee_tg_check,
 		.destroy    = tee_tg_destroy,
 		.me         = THIS_MODULE,
···
 		.family     = NFPROTO_IPV6,
 		.target     = tee_tg6,
 		.targetsize = sizeof(struct xt_tee_tginfo),
+		.usersize   = offsetof(struct xt_tee_tginfo, priv),
 		.checkentry = tee_tg_check,
 		.destroy    = tee_tg_destroy,
 		.me         = THIS_MODULE,

net/netfilter/xt_bpf.c

···
 		.match		= bpf_mt,
 		.destroy	= bpf_mt_destroy,
 		.matchsize	= sizeof(struct xt_bpf_info),
+		.usersize	= offsetof(struct xt_bpf_info, filter),
 		.me		= THIS_MODULE,
 	},
 	{
···
 		.match		= bpf_mt_v1,
 		.destroy	= bpf_mt_destroy_v1,
 		.matchsize	= sizeof(struct xt_bpf_info_v1),
+		.usersize	= offsetof(struct xt_bpf_info_v1, filter),
 		.me		= THIS_MODULE,
 	},
 };

net/netfilter/xt_cgroup.c

···
 		.checkentry	= cgroup_mt_check_v1,
 		.match		= cgroup_mt_v1,
 		.matchsize	= sizeof(struct xt_cgroup_info_v1),
+		.usersize	= offsetof(struct xt_cgroup_info_v1, priv),
 		.destroy	= cgroup_mt_destroy_v1,
 		.me		= THIS_MODULE,
 		.hooks		= (1 << NF_INET_LOCAL_OUT) |

net/netfilter/xt_connlimit.c

···
 		int diff;
 		bool addit;
 
-		rbconn = container_of(*rbnode, struct xt_connlimit_rb, node);
+		rbconn = rb_entry(*rbnode, struct xt_connlimit_rb, node);
 
 		parent = *rbnode;
 		diff = same_source_net(addr, mask, &rbconn->addr, family);
···
 	struct rb_node *node;
 
 	while ((node = rb_first(r)) != NULL) {
-		rbconn = container_of(node, struct xt_connlimit_rb, node);
+		rbconn = rb_entry(node, struct xt_connlimit_rb, node);
 
 		rb_erase(node, r);
 
···
 	.checkentry = connlimit_mt_check,
 	.match      = connlimit_mt,
 	.matchsize  = sizeof(struct xt_connlimit_info),
+	.usersize   = offsetof(struct xt_connlimit_info, data),
 	.destroy    = connlimit_mt_destroy,
 	.me         = THIS_MODULE,
 };

net/netfilter/xt_hashlimit.c

···
 		.family         = NFPROTO_IPV4,
 		.match          = hashlimit_mt_v1,
 		.matchsize      = sizeof(struct xt_hashlimit_mtinfo1),
+		.usersize	= offsetof(struct xt_hashlimit_mtinfo1, hinfo),
 		.checkentry     = hashlimit_mt_check_v1,
 		.destroy        = hashlimit_mt_destroy_v1,
 		.me             = THIS_MODULE,
···
 		.family         = NFPROTO_IPV4,
 		.match          = hashlimit_mt,
 		.matchsize      = sizeof(struct xt_hashlimit_mtinfo2),
+		.usersize	= offsetof(struct xt_hashlimit_mtinfo2, hinfo),
 		.checkentry     = hashlimit_mt_check,
 		.destroy        = hashlimit_mt_destroy,
 		.me             = THIS_MODULE,
···
 		.family         = NFPROTO_IPV6,
 		.match          = hashlimit_mt_v1,
 		.matchsize      = sizeof(struct xt_hashlimit_mtinfo1),
+		.usersize	= offsetof(struct xt_hashlimit_mtinfo1, hinfo),
 		.checkentry     = hashlimit_mt_check_v1,
 		.destroy        = hashlimit_mt_destroy_v1,
 		.me             = THIS_MODULE,
···
 		.family         = NFPROTO_IPV6,
 		.match          = hashlimit_mt,
 		.matchsize      = sizeof(struct xt_hashlimit_mtinfo2),
+		.usersize	= offsetof(struct xt_hashlimit_mtinfo2, hinfo),
 		.checkentry     = hashlimit_mt_check,
 		.destroy        = hashlimit_mt_destroy,
 		.me             = THIS_MODULE,

net/netfilter/xt_limit.c

···
 	.compatsize       = sizeof(struct compat_xt_rateinfo),
 	.compat_from_user = limit_mt_compat_from_user,
 	.compat_to_user   = limit_mt_compat_to_user,
+#else
+	.usersize         = offsetof(struct xt_rateinfo, prev),
 #endif
 	.me               = THIS_MODULE,
 };

net/netfilter/xt_pkttype.c

···
 	else if (xt_family(par) == NFPROTO_IPV4 &&
 	    ipv4_is_multicast(ip_hdr(skb)->daddr))
 		type = PACKET_MULTICAST;
-	else if (xt_family(par) == NFPROTO_IPV6 &&
-	    ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
+	else if (xt_family(par) == NFPROTO_IPV6)
 		type = PACKET_MULTICAST;
 	else
 		type = PACKET_BROADCAST;

net/netfilter/xt_quota.c

···
 	.checkentry = quota_mt_check,
 	.destroy    = quota_mt_destroy,
 	.matchsize  = sizeof(struct xt_quota_info),
+	.usersize   = offsetof(struct xt_quota_info, master),
 	.me         = THIS_MODULE,
 };
 

net/netfilter/xt_rateest.c

···
 	.checkentry = xt_rateest_mt_checkentry,
 	.destroy    = xt_rateest_mt_destroy,
 	.matchsize  = sizeof(struct xt_rateest_match_info),
+	.usersize   = offsetof(struct xt_rateest_match_info, est1),
 	.me         = THIS_MODULE,
 };
 

net/netfilter/xt_string.c

···
 	.match      = string_mt,
 	.destroy    = string_mt_destroy,
 	.matchsize  = sizeof(struct xt_string_info),
+	.usersize   = offsetof(struct xt_string_info, config),
 	.me         = THIS_MODULE,
 };
 

net/openvswitch/conntrack.c

···
 
 	ct = nf_ct_tuplehash_to_ctrack(h);
 
-	skb->nfct = &ct->ct_general;
-	skb->nfctinfo = ovs_ct_get_info(h);
+	nf_ct_set(skb, ct, ovs_ct_get_info(h));
 	return ct;
 }
 
···
 
 		/* Associate skb with specified zone. */
 		if (tmpl) {
-			if (skb->nfct)
-				nf_conntrack_put(skb->nfct);
+			if (skb_nfct(skb))
+				nf_conntrack_put(skb_nfct(skb));
 			nf_conntrack_get(&tmpl->ct_general);
-			skb->nfct = &tmpl->ct_general;
-			skb->nfctinfo = IP_CT_NEW;
+			nf_ct_set(skb, tmpl, IP_CT_NEW);
 		}
 
 		err = nf_conntrack_in(net, info->family,
···
 		if (err)
 			return err;
 
-		ct = (struct nf_conn *)skb->nfct;
+		ct = (struct nf_conn *)skb_nfct(skb);
 		if (ct)
 			nf_ct_deliver_cached_events(ct);
 	}

net/sched/cls_flow.c

···
 static u32 flow_get_nfct(const struct sk_buff *skb)
 {
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	return addr_fold(skb->nfct);
+	return addr_fold(skb_nfct(skb));
 #else
 	return 0;
 #endif