text: /*
   * Copyright (c) 2007-2013 Nicira, Inc.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   * 02110-1301, USA
   */
  
  #include "flow.h"
  #include "datapath.h"
  #include <linux/uaccess.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/if_ether.h>
  #include <linux/if_vlan.h>
  #include <net/llc_pdu.h>
  #include <linux/kernel.h>
  #include <linux/jhash.h>
  #include <linux/jiffies.h>
  #include <linux/llc.h>
  #include <linux/module.h>
  #include <linux/in.h>
  #include <linux/rcupdate.h>
  #include <linux/if_arp.h>
  #include <linux/ip.h>
  #include <linux/ipv6.h>
  #include <linux/sctp.h>
  #include <linux/tcp.h>
  #include <linux/udp.h>
  #include <linux/icmp.h>
  #include <linux/icmpv6.h>
  #include <linux/rculist.h>
  #include <net/ip.h>
  #include <net/ipv6.h>
  #include <net/ndisc.h>
  
  #include "flow_netlink.h"
  
  static void update_range__(struct sw_flow_match *match,
  			   size_t offset, size_t size, bool is_mask)
  {
  	struct sw_flow_key_range *range = NULL;
  	size_t start = rounddown(offset, sizeof(long));
  	size_t end = roundup(offset + size, sizeof(long));
  
  	if (!is_mask)
  		range = &match->range;
  	else if (match->mask)
  		range = &match->mask->range;
  
  	if (!range)
  		return;
  
  	if (range->start == range->end) {
  		range->start = start;
  		range->end = end;
  		return;
  	}
  
  	if (range->start > start)
  		range->start = start;
  
  	if (range->end < end)
  		range->end = end;
  }
  
  #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  	do { \
  		update_range__(match, offsetof(struct sw_flow_key, field),  \
  				     sizeof((match)->key->field), is_mask); \
  		if (is_mask) {						    \
  			if ((match)->mask)				    \
  				(match)->mask->key.field = value;	    \
  		} else {                                                    \
  			(match)->key->field = value;		            \
  		}                                                           \
  	} while (0)
  
  #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
  	do { \
  		update_range__(match, offsetof(struct sw_flow_key, field),  \
  				len, is_mask);                              \
  		if (is_mask) {						    \
  			if ((match)->mask)				    \
  				memcpy(&(match)->mask->key.field, value_p, len);\
  		} else {                                                    \
  			memcpy(&(match)->key->field, value_p, len);         \
  		}                                                           \
  	} while (0)
  
  static u16 range_n_bytes(const struct sw_flow_key_range *range)
  {
  	return range->end - range->start;
  }
  
  static bool match_validate(const struct sw_flow_match *match,
  			   u64 key_attrs, u64 mask_attrs)
  {
  	u64 key_expected = 1 << OVS_KEY_ATTR_ETHERNET;
  	u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
  
  	/* The following mask attributes allowed only if they
  	 * pass the validation tests. */
  	mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
  			| (1 << OVS_KEY_ATTR_IPV6)
  			| (1 << OVS_KEY_ATTR_TCP)
  			| (1 << OVS_KEY_ATTR_TCP_FLAGS)
  			| (1 << OVS_KEY_ATTR_UDP)
  			| (1 << OVS_KEY_ATTR_SCTP)
  			| (1 << OVS_KEY_ATTR_ICMP)
  			| (1 << OVS_KEY_ATTR_ICMPV6)
  			| (1 << OVS_KEY_ATTR_ARP)
  			| (1 << OVS_KEY_ATTR_ND));
  
  	/* Always allowed mask fields. */
  	mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
  		       | (1 << OVS_KEY_ATTR_IN_PORT)
  		       | (1 << OVS_KEY_ATTR_ETHERTYPE));
  
  	/* Check key attributes. */
  	if (match->key->eth.type == htons(ETH_P_ARP)
  			|| match->key->eth.type == htons(ETH_P_RARP)) {
  		key_expected |= 1 << OVS_KEY_ATTR_ARP;
  		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
  			mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
  	}
  
  	if (match->key->eth.type == htons(ETH_P_IP)) {
  		key_expected |= 1 << OVS_KEY_ATTR_IPV4;
  		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
  			mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
  
  		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
  			if (match->key->ip.proto == IPPROTO_UDP) {
  				key_expected |= 1 << OVS_KEY_ATTR_UDP;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
  			}
  
  			if (match->key->ip.proto == IPPROTO_SCTP) {
  				key_expected |= 1 << OVS_KEY_ATTR_SCTP;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
  			}
  
  			if (match->key->ip.proto == IPPROTO_TCP) {
  				key_expected |= 1 << OVS_KEY_ATTR_TCP;
  				key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
  				if (match->mask && (match->mask->key.ip.proto == 0xff)) {
  					mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
  					mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
  				}
  			}
  
  			if (match->key->ip.proto == IPPROTO_ICMP) {
  				key_expected |= 1 << OVS_KEY_ATTR_ICMP;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
  			}
  		}
  	}
  
  	if (match->key->eth.type == htons(ETH_P_IPV6)) {
  		key_expected |= 1 << OVS_KEY_ATTR_IPV6;
  		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
  			mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
  
  		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
  			if (match->key->ip.proto == IPPROTO_UDP) {
  				key_expected |= 1 << OVS_KEY_ATTR_UDP;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
  			}
  
  			if (match->key->ip.proto == IPPROTO_SCTP) {
  				key_expected |= 1 << OVS_KEY_ATTR_SCTP;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
  			}
  
  			if (match->key->ip.proto == IPPROTO_TCP) {
  				key_expected |= 1 << OVS_KEY_ATTR_TCP;
  				key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
  				if (match->mask && (match->mask->key.ip.proto == 0xff)) {
  					mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
  					mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
  				}
  			}
  
  			if (match->key->ip.proto == IPPROTO_ICMPV6) {
  				key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
  				if (match->mask && (match->mask->key.ip.proto == 0xff))
  					mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
  
  				if (match->key->ipv6.tp.src ==
  						htons(NDISC_NEIGHBOUR_SOLICITATION) ||
  				    match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
  					key_expected |= 1 << OVS_KEY_ATTR_ND;
  					if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
  						mask_allowed |= 1 << OVS_KEY_ATTR_ND;
  				}
  			}
  		}
  	}
  
  	if ((key_attrs & key_expected) != key_expected) {
  		/* Key attributes check failed. */
  		OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
  				key_attrs, key_expected);
  		return false;
  	}
  
  	if ((mask_attrs & mask_allowed) != mask_attrs) {
  		/* Mask attributes check failed. */
  		OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
  				mask_attrs, mask_allowed);
  		return false;
  	}
  
  	return true;
  }
  
  /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
  static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
  	[OVS_KEY_ATTR_ENCAP] = -1,
  	[OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
  	[OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
  	[OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
  	[OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
  	[OVS_KEY_ATTR_VLAN] = sizeof(__be16),
  	[OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
  	[OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
  	[OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
  	[OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
  	[OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
  	[OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
  	[OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
  	[OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
  	[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
  	[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
  	[OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
  	[OVS_KEY_ATTR_TUNNEL] = -1,
  };
  
  static bool is_all_zero(const u8 *fp, size_t size)
  {
  	int i;
  
  	if (!fp)
  		return false;
  
  	for (i = 0; i < size; i++)
  		if (fp[i])
  			return false;
  
  	return true;
  }
  
  static bool is_all_set(const u8 *fp, size_t size)
  {
  	int i;
  
  	if (!fp)
  		return false;
  
  	for (i = 0; i < size; i++)
  		if (fp[i] != 0xff)
  			return false;
  
  	return true;
  }
  
  static int __parse_flow_nlattrs(const struct nlattr *attr,
  				const struct nlattr *a[],
  				u64 *attrsp, bool nz)
  {
  	const struct nlattr *nla;
  	u64 attrs;
  	int rem;
  
  	attrs = *attrsp;
  	nla_for_each_nested(nla, attr, rem) {
  		u16 type = nla_type(nla);
  		int expected_len;
  
  		if (type > OVS_KEY_ATTR_MAX) {
  			OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
  				  type, OVS_KEY_ATTR_MAX);
  			return -EINVAL;
  		}
  
  		if (attrs & (1 << type)) {
  			OVS_NLERR("Duplicate key attribute (type %d).\n", type);
  			return -EINVAL;
  		}
  
  		expected_len = ovs_key_lens[type];
  		if (nla_len(nla) != expected_len && expected_len != -1) {
  			OVS_NLERR("Key attribute has unexpected length (type=%d"
  				  ", length=%d, expected=%d).\n", type,
  				  nla_len(nla), expected_len);
  			return -EINVAL;
  		}
  
  		if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
  			attrs |= 1 << type;
  			a[type] = nla;
  		}
  	}
  	if (rem) {
  		OVS_NLERR("Message has %d unknown bytes.\n", rem);
  		return -EINVAL;
  	}
  
  	*attrsp = attrs;
  	return 0;
  }
  
  static int parse_flow_mask_nlattrs(const struct nlattr *attr,
  				   const struct nlattr *a[], u64 *attrsp)
  {
  	return __parse_flow_nlattrs(attr, a, attrsp, true);
  }
  
  static int parse_flow_nlattrs(const struct nlattr *attr,
  			      const struct nlattr *a[], u64 *attrsp)
  {
  	return __parse_flow_nlattrs(attr, a, attrsp, false);
  }
  
  static int ipv4_tun_from_nlattr(const struct nlattr *attr,
  				struct sw_flow_match *match, bool is_mask)
  {
  	struct nlattr *a;
  	int rem;
  	bool ttl = false;
  	__be16 tun_flags = 0;
  
  	nla_for_each_nested(a, attr, rem) {
  		int type = nla_type(a);
  		static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
  			[OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
  			[OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
  			[OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
  			[OVS_TUNNEL_KEY_ATTR_TOS] = 1,
  			[OVS_TUNNEL_KEY_ATTR_TTL] = 1,
  			[OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
  			[OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
  		};
  
  		if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
  			OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
  			type, OVS_TUNNEL_KEY_ATTR_MAX);
  			return -EINVAL;
  		}
  
  		if (ovs_tunnel_key_lens[type] != nla_len(a)) {
  			OVS_NLERR("IPv4 tunnel attribute type has unexpected "
  				  " length (type=%d, length=%d, expected=%d).\n",
  				  type, nla_len(a), ovs_tunnel_key_lens[type]);
  			return -EINVAL;
  		}
  
  		switch (type) {
  		case OVS_TUNNEL_KEY_ATTR_ID:
  			SW_FLOW_KEY_PUT(match, tun_key.tun_id,
  					nla_get_be64(a), is_mask);
  			tun_flags |= TUNNEL_KEY;
  			break;
  		case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
  			SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
  					nla_get_be32(a), is_mask);
  			break;
  		case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
  			SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
  					nla_get_be32(a), is_mask);
  			break;
  		case OVS_TUNNEL_KEY_ATTR_TOS:
  			SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
  					nla_get_u8(a), is_mask);
  			break;
  		case OVS_TUNNEL_KEY_ATTR_TTL:
  			SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
  					nla_get_u8(a), is_mask);
  			ttl = true;
  			break;
  		case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
  			tun_flags |= TUNNEL_DONT_FRAGMENT;
  			break;
  		case OVS_TUNNEL_KEY_ATTR_CSUM:
  			tun_flags |= TUNNEL_CSUM;
  			break;
  		default:
  			return -EINVAL;
  		}
  	}
  
  	SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
  
  	if (rem > 0) {
  		OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
  		return -EINVAL;
  	}
  
  	if (!is_mask) {
  		if (!match->key->tun_key.ipv4_dst) {
  			OVS_NLERR("IPv4 tunnel destination address is zero.\n");
  			return -EINVAL;
  		}
  
  		if (!ttl) {
  			OVS_NLERR("IPv4 tunnel TTL not specified.\n");
  			return -EINVAL;
  		}
  	}
  
  	return 0;
  }
  
  static int ipv4_tun_to_nlattr(struct sk_buff *skb,
  			      const struct ovs_key_ipv4_tunnel *tun_key,
  			      const struct ovs_key_ipv4_tunnel *output)
  {
  	struct nlattr *nla;
  
  	nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
  	if (!nla)
  		return -EMSGSIZE;
  
  	if (output->tun_flags & TUNNEL_KEY &&
  	    nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
  		return -EMSGSIZE;
  	if (output->ipv4_src &&
  		nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
  		return -EMSGSIZE;
  	if (output->ipv4_dst &&
  		nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
  		return -EMSGSIZE;
  	if (output->ipv4_tos &&
  		nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
  		return -EMSGSIZE;
  	if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
  		return -EMSGSIZE;
  	if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
  		nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
  		return -EMSGSIZE;
  	if ((output->tun_flags & TUNNEL_CSUM) &&
  		nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
  		return -EMSGSIZE;
  
  	nla_nest_end(skb, nla);
  	return 0;
  }
  
  
  static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
  				 const struct nlattr **a, bool is_mask)
  {
  	if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
  		SW_FLOW_KEY_PUT(match, phy.priority,
  			  nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
  		*attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
  	}
  
  	if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
  		u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
  
  		if (is_mask)
  			in_port = 0xffffffff; /* Always exact match in_port. */
  		else if (in_port >= DP_MAX_PORTS)
  			return -EINVAL;
  
  		SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
  		*attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
  	} else if (!is_mask) {
  		SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
  	}
  
  	if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
  		uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
  
  		SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
  		*attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
  	}
  	if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
  		if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
  					 is_mask))
  			return -EINVAL;
  		*attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
  	}
  	return 0;
  }
  
  static int ovs_key_from_nlattrs(struct sw_flow_match *match,  bool *exact_5tuple,
  				u64 attrs, const struct nlattr **a,
  				bool is_mask)
  {
  	int err;
  	u64 orig_attrs = attrs;
  
  	err = metadata_from_nlattrs(match, &attrs, a, is_mask);
  	if (err)
  		return err;
  
  	if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
  		const struct ovs_key_ethernet *eth_key;
  
  		eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
  		SW_FLOW_KEY_MEMCPY(match, eth.src,
  				eth_key->eth_src, ETH_ALEN, is_mask);
  		SW_FLOW_KEY_MEMCPY(match, eth.dst,
  				eth_key->eth_dst, ETH_ALEN, is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
  		__be16 tci;
  
  		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
  		if (!(tci & htons(VLAN_TAG_PRESENT))) {
  			if (is_mask)
  				OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
  			else
  				OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
  
  			return -EINVAL;
  		}
  
  		SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
  	} else if (!is_mask)
  		SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
  
  	if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
  		__be16 eth_type;
  
  		eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
  		if (is_mask) {
  			/* Always exact match EtherType. */
  			eth_type = htons(0xffff);
  		} else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
  			OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
  					ntohs(eth_type), ETH_P_802_3_MIN);
  			return -EINVAL;
  		}
  
  		SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
  	} else if (!is_mask) {
  		SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
  	}
  
  	if (is_mask && exact_5tuple) {
  		if (match->mask->key.eth.type != htons(0xffff))
  			*exact_5tuple = false;
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
  		const struct ovs_key_ipv4 *ipv4_key;
  
  		ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
  		if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
  			OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
  				ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
  			return -EINVAL;
  		}
  		SW_FLOW_KEY_PUT(match, ip.proto,
  				ipv4_key->ipv4_proto, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.tos,
  				ipv4_key->ipv4_tos, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.ttl,
  				ipv4_key->ipv4_ttl, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.frag,
  				ipv4_key->ipv4_frag, is_mask);
  		SW_FLOW_KEY_PUT(match, ipv4.addr.src,
  				ipv4_key->ipv4_src, is_mask);
  		SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
  				ipv4_key->ipv4_dst, is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
  
  		if (is_mask && exact_5tuple && *exact_5tuple) {
  			if (ipv4_key->ipv4_proto != 0xff ||
  			    ipv4_key->ipv4_src != htonl(0xffffffff) ||
  			    ipv4_key->ipv4_dst != htonl(0xffffffff))
  				*exact_5tuple = false;
  		}
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
  		const struct ovs_key_ipv6 *ipv6_key;
  
  		ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
  		if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
  			OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
  				ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
  			return -EINVAL;
  		}
  		SW_FLOW_KEY_PUT(match, ipv6.label,
  				ipv6_key->ipv6_label, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.proto,
  				ipv6_key->ipv6_proto, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.tos,
  				ipv6_key->ipv6_tclass, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.ttl,
  				ipv6_key->ipv6_hlimit, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.frag,
  				ipv6_key->ipv6_frag, is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
  				ipv6_key->ipv6_src,
  				sizeof(match->key->ipv6.addr.src),
  				is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
  				ipv6_key->ipv6_dst,
  				sizeof(match->key->ipv6.addr.dst),
  				is_mask);
  
  		attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
  
  		if (is_mask && exact_5tuple && *exact_5tuple) {
  			if (ipv6_key->ipv6_proto != 0xff ||
  			    !is_all_set((u8 *)ipv6_key->ipv6_src, sizeof(match->key->ipv6.addr.src)) ||
  			    !is_all_set((u8 *)ipv6_key->ipv6_dst, sizeof(match->key->ipv6.addr.dst)))
  				*exact_5tuple = false;
  		}
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
  		const struct ovs_key_arp *arp_key;
  
  		arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
  		if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
  			OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
  				  arp_key->arp_op);
  			return -EINVAL;
  		}
  
  		SW_FLOW_KEY_PUT(match, ipv4.addr.src,
  				arp_key->arp_sip, is_mask);
  		SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
  			arp_key->arp_tip, is_mask);
  		SW_FLOW_KEY_PUT(match, ip.proto,
  				ntohs(arp_key->arp_op), is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
  				arp_key->arp_sha, ETH_ALEN, is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
  				arp_key->arp_tha, ETH_ALEN, is_mask);
  
  		attrs &= ~(1 << OVS_KEY_ATTR_ARP);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
  		const struct ovs_key_tcp *tcp_key;
  
  		tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
  		if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
  			SW_FLOW_KEY_PUT(match, ipv4.tp.src,
  					tcp_key->tcp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
  					tcp_key->tcp_dst, is_mask);
  		} else {
  			SW_FLOW_KEY_PUT(match, ipv6.tp.src,
  					tcp_key->tcp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
  					tcp_key->tcp_dst, is_mask);
  		}
  		attrs &= ~(1 << OVS_KEY_ATTR_TCP);
  
  		if (is_mask && exact_5tuple && *exact_5tuple &&
  		    (tcp_key->tcp_src != htons(0xffff) ||
  		     tcp_key->tcp_dst != htons(0xffff)))
  			*exact_5tuple = false;
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
  		if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
  			SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
  					nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
  					is_mask);
  		} else {
  			SW_FLOW_KEY_PUT(match, ipv6.tp.flags,
  					nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
  					is_mask);
  		}
  		attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
  		const struct ovs_key_udp *udp_key;
  
  		udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
  		if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
  			SW_FLOW_KEY_PUT(match, ipv4.tp.src,
  					udp_key->udp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
  					udp_key->udp_dst, is_mask);
  		} else {
  			SW_FLOW_KEY_PUT(match, ipv6.tp.src,
  					udp_key->udp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
  					udp_key->udp_dst, is_mask);
  		}
  		attrs &= ~(1 << OVS_KEY_ATTR_UDP);
  
  		if (is_mask && exact_5tuple && *exact_5tuple &&
  		    (udp_key->udp_src != htons(0xffff) ||
  		     udp_key->udp_dst != htons(0xffff)))
  			*exact_5tuple = false;
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
  		const struct ovs_key_sctp *sctp_key;
  
  		sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
  		if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
  			SW_FLOW_KEY_PUT(match, ipv4.tp.src,
  					sctp_key->sctp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
  					sctp_key->sctp_dst, is_mask);
  		} else {
  			SW_FLOW_KEY_PUT(match, ipv6.tp.src,
  					sctp_key->sctp_src, is_mask);
  			SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
  					sctp_key->sctp_dst, is_mask);
  		}
  		attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
  		const struct ovs_key_icmp *icmp_key;
  
  		icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
  		SW_FLOW_KEY_PUT(match, ipv4.tp.src,
  				htons(icmp_key->icmp_type), is_mask);
  		SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
  				htons(icmp_key->icmp_code), is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
  		const struct ovs_key_icmpv6 *icmpv6_key;
  
  		icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
  		SW_FLOW_KEY_PUT(match, ipv6.tp.src,
  				htons(icmpv6_key->icmpv6_type), is_mask);
  		SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
  				htons(icmpv6_key->icmpv6_code), is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
  	}
  
  	if (attrs & (1 << OVS_KEY_ATTR_ND)) {
  		const struct ovs_key_nd *nd_key;
  
  		nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
  		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
  			nd_key->nd_target,
  			sizeof(match->key->ipv6.nd.target),
  			is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
  			nd_key->nd_sll, ETH_ALEN, is_mask);
  		SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
  				nd_key->nd_tll, ETH_ALEN, is_mask);
  		attrs &= ~(1 << OVS_KEY_ATTR_ND);
  	}
  
  	if (attrs != 0)
  		return -EINVAL;
  
  	return 0;
  }
  
  static void sw_flow_mask_set(struct sw_flow_mask *mask,
  			     struct sw_flow_key_range *range, u8 val)
  {
  	u8 *m = (u8 *)&mask->key + range->start;
  
  	mask->range = *range;
  	memset(m, val, range_n_bytes(range));
  }
  
  /**
   * ovs_nla_get_match - parses Netlink attributes into a flow key and
   * mask. In case the 'mask' is NULL, the flow is treated as exact match
   * flow. Otherwise, it is treated as a wildcarded flow, except the mask
   * does not include any don't care bit.
   * @match: receives the extracted flow match information.
   * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
   * sequence. The fields should of the packet that triggered the creation
   * of this flow.
   * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
   * attribute specifies the mask field of the wildcarded flow.
   */
  int ovs_nla_get_match(struct sw_flow_match *match,
  		      bool *exact_5tuple,
  		      const struct nlattr *key,
  		      const struct nlattr *mask)
  {
  	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
  	const struct nlattr *encap;
  	u64 key_attrs = 0;
  	u64 mask_attrs = 0;
  	bool encap_valid = false;
  	int err;
  
  	err = parse_flow_nlattrs(key, a, &key_attrs);
  	if (err)
  		return err;
  
  	if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
  	    (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
  	    (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
  		__be16 tci;
  
  		if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
  		      (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
  			OVS_NLERR("Invalid Vlan frame.\n");
  			return -EINVAL;
  		}
  
  		key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
  		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
  		encap = a[OVS_KEY_ATTR_ENCAP];
  		key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
  		encap_valid = true;
  
  		if (tci & htons(VLAN_TAG_PRESENT)) {
  			err = parse_flow_nlattrs(encap, a, &key_attrs);
  			if (err)
  				return err;
  		} else if (!tci) {
  			/* Corner case for truncated 802.1Q header. */
  			if (nla_len(encap)) {
  				OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
  				return -EINVAL;
  			}
  		} else {
  			OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
  			return  -EINVAL;
  		}
  	}
  
  	err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
  	if (err)
  		return err;
  
  	if (exact_5tuple)
  		*exact_5tuple = true;
  
  	if (mask) {
  		err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
  		if (err)
  			return err;
  
  		if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP)  {
  			__be16 eth_type = 0;
  			__be16 tci = 0;
  
  			if (!encap_valid) {
  				OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
  				return  -EINVAL;
  			}
  
  			mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
  			if (a[OVS_KEY_ATTR_ETHERTYPE])
  				eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
  
  			if (eth_type == htons(0xffff)) {
  				mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
  				encap = a[OVS_KEY_ATTR_ENCAP];
  				err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
  			} else {
  				OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
  						ntohs(eth_type));
  				return -EINVAL;
  			}
  
  			if (a[OVS_KEY_ATTR_VLAN])
  				tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
  
  			if (!(tci & htons(VLAN_TAG_PRESENT))) {
  				OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
  				return -EINVAL;
  			}
  		}
  
  		err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
  		if (err)
  			return err;
  	} else {
  		/* Populate exact match flow's key mask. */
  		if (match->mask)
  			sw_flow_mask_set(match->mask, &match->range, 0xff);
  	}
  
  	if (!match_validate(match, key_attrs, mask_attrs))
  		return -EINVAL;
  
  	return 0;
  }
  
  /**
   * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
   * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
   * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
   * sequence.
   *
   * This parses a series of Netlink attributes that form a flow key, which must
   * take the same form accepted by flow_from_nlattrs(), but only enough of it to
   * get the metadata, that is, the parts of the flow key that cannot be
   * extracted from the packet itself.
   */
  
  int ovs_nla_get_flow_metadata(struct sw_flow *flow,
  			      const struct nlattr *attr)
  {
  	struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
  	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
  	u64 attrs = 0;
  	int err;
  	struct sw_flow_match match;
  
  	flow->key.phy.in_port = DP_MAX_PORTS;
  	flow->key.phy.priority = 0;
  	flow->key.phy.skb_mark = 0;
  	memset(tun_key, 0, sizeof(flow->key.tun_key));
  
  	err = parse_flow_nlattrs(attr, a, &attrs);
  	if (err)
  		return -EINVAL;
  
  	memset(&match, 0, sizeof(match));
  	match.key = &flow->key;
  
  	err = metadata_from_nlattrs(&match, &attrs, a, false);
  	if (err)
  		return err;
  
  	return 0;
  }
  
  int ovs_nla_put_flow(const struct sw_flow_key *swkey,
  		     const struct sw_flow_key *output, struct sk_buff *skb)
  {
  	struct ovs_key_ethernet *eth_key;
  	struct nlattr *nla, *encap;
  	bool is_mask = (swkey != output);
  
  	if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
  		goto nla_put_failure;
  
  	if ((swkey->tun_key.ipv4_dst || is_mask) &&
  	    ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
  		goto nla_put_failure;
  
  	if (swkey->phy.in_port == DP_MAX_PORTS) {
  		if (is_mask && (output->phy.in_port == 0xffff))
  			if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
  				goto nla_put_failure;
  	} else {
  		u16 upper_u16;
  		upper_u16 = !is_mask ? 0 : 0xffff;
  
  		if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
  				(upper_u16 << 16) | output->phy.in_port))
  			goto nla_put_failure;
  	}
  
  	if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
  		goto nla_put_failure;
  
  	nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
  	if (!nla)
  		goto nla_put_failure;
  
  	eth_key = nla_data(nla);
  	memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
  	memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
  
  	if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
  		__be16 eth_type;
  		eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
  		if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
  		    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
  			goto nla_put_failure;
  		encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
  		if (!swkey->eth.tci)
  			goto unencap;
  	} else
  		encap = NULL;
  
  	if (swkey->eth.type == htons(ETH_P_802_2)) {
  		/*
  		 * Ethertype 802.2 is represented in the netlink with omitted
  		 * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
  		 * 0xffff in the mask attribute.  Ethertype can also
  		 * be wildcarded.
  		 */
  		if (is_mask && output->eth.type)
  			if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
  						output->eth.type))
  				goto nla_put_failure;
  		goto unencap;
  	}
  
  	if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
  		goto nla_put_failure;
  
  	if (swkey->eth.type == htons(ETH_P_IP)) {
  		struct ovs_key_ipv4 *ipv4_key;
  
  		nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
  		if (!nla)
  			goto nla_put_failure;
  		ipv4_key = nla_data(nla);
  		ipv4_key->ipv4_src = output->ipv4.addr.src;
  		ipv4_key->ipv4_dst = output->ipv4.addr.dst;
  		ipv4_key->ipv4_proto = output->ip.proto;
  		ipv4_key->ipv4_tos = output->ip.tos;
  		ipv4_key->ipv4_ttl = output->ip.ttl;
  		ipv4_key->ipv4_frag = output->ip.frag;
  	} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
  		struct ovs_key_ipv6 *ipv6_key;
  
  		nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
  		if (!nla)
  			goto nla_put_failure;
  		ipv6_key = nla_data(nla);
  		memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
  				sizeof(ipv6_key->ipv6_src));
  		memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
  				sizeof(ipv6_key->ipv6_dst));
  		ipv6_key->ipv6_label = output->ipv6.label;
  		ipv6_key->ipv6_proto = output->ip.proto;
  		ipv6_key->ipv6_tclass = output->ip.tos;
  		ipv6_key->ipv6_hlimit = output->ip.ttl;
  		ipv6_key->ipv6_frag = output->ip.frag;
  	} else if (swkey->eth.type == htons(ETH_P_ARP) ||
  		   swkey->eth.type == htons(ETH_P_RARP)) {
  		struct ovs_key_arp *arp_key;
  
  		nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
  		if (!nla)
  			goto nla_put_failure;
  		arp_key = nla_data(nla);
  		memset(arp_key, 0, sizeof(struct ovs_key_arp));
  		arp_key->arp_sip = output->ipv4.addr.src;
  		arp_key->arp_tip = output->ipv4.addr.dst;
  		arp_key->arp_op = htons(output->ip.proto);
  		memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
  		memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
  	}
  
  	if ((swkey->eth.type == htons(ETH_P_IP) ||
  	     swkey->eth.type == htons(ETH_P_IPV6)) &&
  	     swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
  
  		if (swkey->ip.proto == IPPROTO_TCP) {
  			struct ovs_key_tcp *tcp_key;
  
  			nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
  			if (!nla)
  				goto nla_put_failure;
  			tcp_key = nla_data(nla);
  			if (swkey->eth.type == htons(ETH_P_IP)) {
  				tcp_key->tcp_src = output->ipv4.tp.src;
  				tcp_key->tcp_dst = output->ipv4.tp.dst;
  				if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
  						 output->ipv4.tp.flags))
  					goto nla_put_failure;
  			} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
  				tcp_key->tcp_src = output->ipv6.tp.src;
  				tcp_key->tcp_dst = output->ipv6.tp.dst;
  				if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
  						 output->ipv6.tp.flags))
  					goto nla_put_failure;
  			}
  		} else if (swkey->ip.proto == IPPROTO_UDP) {
  			struct ovs_key_udp *udp_key;
  
  			nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
  			if (!nla)
  				goto nla_put_failure;
  			udp_key = nla_data(nla);
  			if (swkey->eth.type == htons(ETH_P_IP)) {
  				udp_key->udp_src = output->ipv4.tp.src;
  				udp_key->udp_dst = output->ipv4.tp.dst;
  			} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
  				udp_key->udp_src = output->ipv6.tp.src;
  				udp_key->udp_dst = output->ipv6.tp.dst;
  			}
  		} else if (swkey->ip.proto == IPPROTO_SCTP) {
  			struct ovs_key_sctp *sctp_key;
  
  			nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
  			if (!nla)
  				goto nla_put_failure;
  			sctp_key = nla_data(nla);
  			if (swkey->eth.type == htons(ETH_P_IP)) {
  				sctp_key->sctp_src = swkey->ipv4.tp.src;
  				sctp_key->sctp_dst = swkey->ipv4.tp.dst;
  			} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
  				sctp_key->sctp_src = swkey->ipv6.tp.src;
  				sctp_key->sctp_dst = swkey->ipv6.tp.dst;
  			}
  		} else if (swkey->eth.type == htons(ETH_P_IP) &&
  			   swkey->ip.proto == IPPROTO_ICMP) {
  			struct ovs_key_icmp *icmp_key;
  
  			nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
  			if (!nla)
  				goto nla_put_failure;
  			icmp_key = nla_data(nla);
  			icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
  			icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
  		} else if (swkey->eth.type == htons(ETH_P_IPV6) &&
  			   swkey->ip.proto == IPPROTO_ICMPV6) {
  			struct ovs_key_icmpv6 *icmpv6_key;
  
  			nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
  						sizeof(*icmpv6_key));
  			if (!nla)
  				goto nla_put_failure;
  			icmpv6_key = nla_data(nla);
  			icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
  			icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
  
  			if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
  			    icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
  				struct ovs_key_nd *nd_key;
  
  				nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
  				if (!nla)
  					goto nla_put_failure;
  				nd_key = nla_data(nla);
  				memcpy(nd_key->nd_target, &output->ipv6.nd.target,
  							sizeof(nd_key->nd_target));
  				memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
  				memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
  			}
  		}
  	}
  
  unencap:
  	if (encap)
  		nla_nest_end(skb, encap);
  
  	return 0;
  
  nla_put_failure:
  	return -EMSGSIZE;
  }
  
  #define MAX_ACTIONS_BUFSIZE	(32 * 1024)
  
  struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
  {
  	struct sw_flow_actions *sfa;
  
  	if (size > MAX_ACTIONS_BUFSIZE)
  		return ERR_PTR(-EINVAL);
  
  	sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
  	if (!sfa)
  		return ERR_PTR(-ENOMEM);
  
  	sfa->actions_len = 0;
  	return sfa;
  }
  
  /* Schedules 'sf_acts' to be freed after the next RCU grace period.
   * The caller must hold rcu_read_lock for this to be sensible. */
  void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
  {
  	kfree_rcu(sf_acts, rcu);
  }
  
  static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
  				       int attr_len)
  {
  
  	struct sw_flow_actions *acts;
  	int new_acts_size;
  	int req_size = NLA_ALIGN(attr_len);
  	int next_offset = offsetof(struct sw_flow_actions, actions) +
  					(*sfa)->actions_len;
  
  	if (req_size <= (ksize(*sfa) - next_offset))
  		goto out;
  
  	new_acts_size = ksize(*sfa) * 2;
  
  	if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
  		if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
  			return ERR_PTR(-EMSGSIZE);
  		new_acts_size = MAX_ACTIONS_BUFSIZE;
  	}
  
  	acts = ovs_nla_alloc_flow_actions(new_acts_size);
  	if (IS_ERR(acts))
  		return (void *)acts;
  
  	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
  	acts->actions_len = (*sfa)->actions_len;
  	kfree(*sfa);
  	*sfa = acts;
  
  out:
  	(*sfa)->actions_len += req_size;
  	return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
  }
  
  static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
  {
  	struct nlattr *a;
  
  	a = reserve_sfa_size(sfa, nla_attr_size(len));
  	if (IS_ERR(a))
  		return PTR_ERR(a);
  
  	a->nla_type = attrtype;
  	a->nla_len = nla_attr_size(len);
  
  	if (data)
  		memcpy(nla_data(a), data, len);
  	memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
  
  	return 0;
  }
  
  static inline int add_nested_action_start(struct sw_flow_actions **sfa,
  					  int attrtype)
  {
  	int used = (*sfa)->actions_len;
  	int err;
  
  	err = add_action(sfa, attrtype, NULL, 0);
  	if (err)
  		return err;
  
  	return used;
  }
  
  static inline void add_nested_action_end(struct sw_flow_actions *sfa,
  					 int st_offset)
  {
  	struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
  							       st_offset);
  
  	a->nla_len = sfa->actions_len - st_offset;
  }
  
  static int validate_and_copy_sample(const struct nlattr *attr,
  				    const struct sw_flow_key *key, int depth,
  				    struct sw_flow_actions **sfa)
  {
  	const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
  	const struct nlattr *probability, *actions;
  	const struct nlattr *a;
  	int rem, start, err, st_acts;
  
  	memset(attrs, 0, sizeof(attrs));
  	nla_for_each_nested(a, attr, rem) {
  		int type = nla_type(a);
  		if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
  			return -EINVAL;
  		attrs[type] = a;
  	}
  	if (rem)
  		return -EINVAL;
  
  	probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
  	if (!probability || nla_len(probability) != sizeof(u32))
  		return -EINVAL;
  
  	actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
  	if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
  		return -EINVAL;
  
  	/* validation done, copy sample action. */
  	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
  	if (start < 0)
  		return start;
  	err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
  			 nla_data(probability), sizeof(u32));
  	if (err)
  		return err;
  	st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
  	if (st_acts < 0)
  		return st_acts;
  
  	err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
  	if (err)
  		return err;
  
  	add_nested_action_end(*sfa, st_acts);
  	add_nested_action_end(*sfa, start);
  
  	return 0;
  }
  
  static int validate_tp_port(const struct sw_flow_key *flow_key)
  {
  	if (flow_key->eth.type == htons(ETH_P_IP)) {
  		if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
  			return 0;
  	} else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
  		if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
  			return 0;
  	}
  
  	return -EINVAL;
  }
  
  void ovs_match_init(struct sw_flow_match *match,
  		    struct sw_flow_key *key,
  		    struct sw_flow_mask *mask)
  {
  	memset(match, 0, sizeof(*match));
  	match->key = key;
  	match->mask = mask;
  
  	memset(key, 0, sizeof(*key));
  
  	if (mask) {
  		memset(&mask->key, 0, sizeof(mask->key));
  		mask->range.start = mask->range.end = 0;
  	}
  }
  
  static int validate_and_copy_set_tun(const struct nlattr *attr,
  				     struct sw_flow_actions **sfa)
  {
  	struct sw_flow_match match;
  	struct sw_flow_key key;
  	int err, start;
  
  	ovs_match_init(&match, &key, NULL);
  	err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
  	if (err)
  		return err;
  
  	start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
  	if (start < 0)
  		return start;
  
  	err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
  			sizeof(match.key->tun_key));
  	add_nested_action_end(*sfa, start);
  
  	return err;
  }
  
  static int validate_set(const struct nlattr *a,
  			const struct sw_flow_key *flow_key,
  			struct sw_flow_actions **sfa,
  			bool *set_tun)
  {
  	const struct nlattr *ovs_key = nla_data(a);
  	int key_type = nla_type(ovs_key);
  
  	/* There can be only one key in a action */
  	if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
  		return -EINVAL;
  
  	if (key_type > OVS_KEY_ATTR_MAX ||
  	    (ovs_key_lens[key_type] != nla_len(ovs_key) &&
  	     ovs_key_lens[key_type] != -1))
  		return -EINVAL;
  
  	switch (key_type) {
  	const struct ovs_key_ipv4 *ipv4_key;
  	const struct ovs_key_ipv6 *ipv6_key;
  	int err;
  
  	case OVS_KEY_ATTR_PRIORITY:
  	case OVS_KEY_ATTR_SKB_MARK:
  	case OVS_KEY_ATTR_ETHERNET:
  		break;
  
  	case OVS_KEY_ATTR_TUNNEL:
  		*set_tun = true;
  		err = validate_and_copy_set_tun(a, sfa);
  		if (err)
  			return err;
  		break;
  
  	case OVS_KEY_ATTR_IPV4:
  		if (flow_key->eth.type != htons(ETH_P_IP))
  			return -EINVAL;
  
  		if (!flow_key->ip.proto)
  			return -EINVAL;
  
  		ipv4_key = nla_data(ovs_key);
  		if (ipv4_key->ipv4_proto != flow_key->ip.proto)
  			return -EINVAL;
  
  		if (ipv4_key->ipv4_frag != flow_key->ip.frag)
  			return -EINVAL;
  
  		break;
  
  	case OVS_KEY_ATTR_IPV6:
  		if (flow_key->eth.type != htons(ETH_P_IPV6))
  			return -EINVAL;
  
  		if (!flow_key->ip.proto)
  			return -EINVAL;
  
  		ipv6_key = nla_data(ovs_key);
  		if (ipv6_key->ipv6_proto != flow_key->ip.proto)
  			return -EINVAL;
  
  		if (ipv6_key->ipv6_frag != flow_key->ip.frag)
  			return -EINVAL;
  
  		if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
  			return -EINVAL;
  
  		break;
  
  	case OVS_KEY_ATTR_TCP:
  		if (flow_key->ip.proto != IPPROTO_TCP)
  			return -EINVAL;
  
  		return validate_tp_port(flow_key);
  
  	case OVS_KEY_ATTR_UDP:
  		if (flow_key->ip.proto != IPPROTO_UDP)
  			return -EINVAL;
  
  		return validate_tp_port(flow_key);
  
  	case OVS_KEY_ATTR_SCTP:
  		if (flow_key->ip.proto != IPPROTO_SCTP)
  			return -EINVAL;
  
  		return validate_tp_port(flow_key);
  
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int validate_userspace(const struct nlattr *attr)
  {
  	static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
  		[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
  		[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
  	};
  	struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
  	int error;
  
  	error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
  				 attr, userspace_policy);
  	if (error)
  		return error;
  
  	if (!a[OVS_USERSPACE_ATTR_PID] ||
  	    !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
  		return -EINVAL;
  
  	return 0;
  }
  
  static int copy_action(const struct nlattr *from,
  		       struct sw_flow_actions **sfa)
  {
  	int totlen = NLA_ALIGN(from->nla_len);
  	struct nlattr *to;
  
  	to = reserve_sfa_size(sfa, from->nla_len);
  	if (IS_ERR(to))
  		return PTR_ERR(to);
  
  	memcpy(to, from, totlen);
  	return 0;
  }
  
  int ovs_nla_copy_actions(const struct nlattr *attr,
  			 const struct sw_flow_key *key,
  			 int depth,
  			 struct sw_flow_actions **sfa)
  {
  	const struct nlattr *a;
  	int rem, err;
  
  	if (depth >= SAMPLE_ACTION_DEPTH)
  		return -EOVERFLOW;
  
  	nla_for_each_nested(a, attr, rem) {
  		/* Expected argument lengths, (u32)-1 for variable length. */
  		static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
  			[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
  			[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
  			[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
  			[OVS_ACTION_ATTR_POP_VLAN] = 0,
  			[OVS_ACTION_ATTR_SET] = (u32)-1,
  			[OVS_ACTION_ATTR_SAMPLE] = (u32)-1
  		};
  		const struct ovs_action_push_vlan *vlan;
  		int type = nla_type(a);
  		bool skip_copy;
  
  		if (type > OVS_ACTION_ATTR_MAX ||
  		    (action_lens[type] != nla_len(a) &&
  		     action_lens[type] != (u32)-1))
  			return -EINVAL;
  
  		skip_copy = false;
  		switch (type) {
  		case OVS_ACTION_ATTR_UNSPEC:
  			return -EINVAL;
  
  		case OVS_ACTION_ATTR_USERSPACE:
  			err = validate_userspace(a);
  			if (err)
  				return err;
  			break;
  
  		case OVS_ACTION_ATTR_OUTPUT:
  			if (nla_get_u32(a) >= DP_MAX_PORTS)
  				return -EINVAL;
  			break;
  
  
  		case OVS_ACTION_ATTR_POP_VLAN:
  			break;
  
  		case OVS_ACTION_ATTR_PUSH_VLAN:
  			vlan = nla_data(a);
  			if (vlan->vlan_tpid != htons(ETH_P_8021Q))
  				return -EINVAL;
  			if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
  				return -EINVAL;
  			break;
  
  		case OVS_ACTION_ATTR_SET:
  			err = validate_set(a, key, sfa, &skip_copy);
  			if (err)
  				return err;
  			break;
  
  		case OVS_ACTION_ATTR_SAMPLE:
  			err = validate_and_copy_sample(a, key, depth, sfa);
  			if (err)
  				return err;
  			skip_copy = true;
  			break;
  
  		default:
  			return -EINVAL;
  		}
  		if (!skip_copy) {
  			err = copy_action(a, sfa);
  			if (err)
  				return err;
  		}
  	}
  
  	if (rem > 0)
  		return -EINVAL;
  
  	return 0;
  }
  
  static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
  {
  	const struct nlattr *a;
  	struct nlattr *start;
  	int err = 0, rem;
  
  	start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
  	if (!start)
  		return -EMSGSIZE;
  
  	nla_for_each_nested(a, attr, rem) {
  		int type = nla_type(a);
  		struct nlattr *st_sample;
  
  		switch (type) {
  		case OVS_SAMPLE_ATTR_PROBABILITY:
  			if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
  				    sizeof(u32), nla_data(a)))
  				return -EMSGSIZE;
  			break;
  		case OVS_SAMPLE_ATTR_ACTIONS:
  			st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
  			if (!st_sample)
  				return -EMSGSIZE;
  			err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
  			if (err)
  				return err;
  			nla_nest_end(skb, st_sample);
  			break;
  		}
  	}
  
  	nla_nest_end(skb, start);
  	return err;
  }
  
  static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
  {
  	const struct nlattr *ovs_key = nla_data(a);
  	int key_type = nla_type(ovs_key);
  	struct nlattr *start;
  	int err;
  
  	switch (key_type) {
  	case OVS_KEY_ATTR_IPV4_TUNNEL:
  		start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
  		if (!start)
  			return -EMSGSIZE;
  
  		err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
  					     nla_data(ovs_key));
  		if (err)
  			return err;
  		nla_nest_end(skb, start);
  		break;
  	default:
  		if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
  			return -EMSGSIZE;
  		break;
  	}
  
  	return 0;
  }
  
  int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
  {
  	const struct nlattr *a;
  	int rem, err;
  
  	nla_for_each_attr(a, attr, len, rem) {
  		int type = nla_type(a);
  
  		switch (type) {
  		case OVS_ACTION_ATTR_SET:
  			err = set_action_to_attr(a, skb);
  			if (err)
  				return err;
  			break;
  
  		case OVS_ACTION_ATTR_SAMPLE:
  			err = sample_action_to_attr(a, skb);
  			if (err)
  				return err;
  			break;
  		default:
  			if (nla_put(skb, type, nla_len(a), nla_data(a)))
  				return -EMSGSIZE;
  			break;
  		}
  	}
  
  	return 0;
  }
  