Release 4.11 net/core/flow_dissector.c

#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/export.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_vlan.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/gre.h>
#include <net/pptp.h>
#include <linux/igmp.h>
#include <linux/icmp.h>
#include <linux/sctp.h>
#include <linux/dccp.h>
#include <linux/if_tunnel.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
#include <linux/stddef.h>
#include <linux/if_ether.h>
#include <linux/mpls.h>
#include <net/flow_dissector.h>
#include <scsi/fc/fc_fcoe.h>



static void dissector_set_key(struct flow_dissector *flow_dissector,
			      enum flow_dissector_key_id key_id)
{
	flow_dissector->used_keys |= (1 << key_id);
}

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void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
			     const struct flow_dissector_key *key,
			     unsigned int key_count)
{
	unsigned int i;

	memset(flow_dissector, 0, sizeof(*flow_dissector));

	for (i = 0; i < key_count; i++, key++) {
		/* User should make sure that every key target offset is withing
                 * boundaries of unsigned short.
                 */
		BUG_ON(key->offset > USHRT_MAX);
		BUG_ON(dissector_uses_key(flow_dissector,
					  key->key_id));

		dissector_set_key(flow_dissector, key->key_id);
		flow_dissector->offset[key->key_id] = key->offset;
	}

	/* Ensure that the dissector always includes control and basic key.
         * That way we are able to avoid handling lack of these in fast path.
         */
	BUG_ON(!dissector_uses_key(flow_dissector,
				   FLOW_DISSECTOR_KEY_CONTROL));
	BUG_ON(!dissector_uses_key(flow_dissector,
				   FLOW_DISSECTOR_KEY_BASIC));
}
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EXPORT_SYMBOL(skb_flow_dissector_init);

/**
 * skb_flow_get_be16 - extract be16 entity
 * @skb: sk_buff to extract from
 * @poff: offset to extract at
 * @data: raw buffer pointer to the packet
 * @hlen: packet header length
 *
 * The function will try to retrieve a be32 entity at
 * offset poff
 */


static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff,
				void *data, int hlen)
{
	__be16 *u, _u;

	u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
	if (u)
		return *u;

	return 0;
}

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/**
 * __skb_flow_get_ports - extract the upper layer ports and return them
 * @skb: sk_buff to extract the ports from
 * @thoff: transport header offset
 * @ip_proto: protocol for which to get port offset
 * @data: raw buffer pointer to the packet, if NULL use skb->data
 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 *
 * The function will try to retrieve the ports at offset thoff + poff where poff
 * is the protocol port offset returned from proto_ports_offset
 */


__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
			    void *data, int hlen)
{
	int poff = proto_ports_offset(ip_proto);

	if (!data) {
		data = skb->data;
		hlen = skb_headlen(skb);
	}

	if (poff >= 0) {
		__be32 *ports, _ports;

		ports = __skb_header_pointer(skb, thoff + poff,
					     sizeof(_ports), data, hlen, &_ports);
		if (ports)
			return *ports;
	}

	return 0;
}
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EXPORT_SYMBOL(__skb_flow_get_ports);

/**
 * __skb_flow_dissect - extract the flow_keys struct and return it
 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 * @flow_dissector: list of keys to dissect
 * @target_container: target structure to put dissected values into
 * @data: raw buffer pointer to the packet, if NULL use skb->data
 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 *
 * The function will try to retrieve individual keys into target specified
 * by flow_dissector from either the skbuff or a raw buffer specified by the
 * rest parameters.
 *
 * Caller must take care of zeroing target container memory.
 */


bool __skb_flow_dissect(const struct sk_buff *skb,
			struct flow_dissector *flow_dissector,
			void *target_container,
			void *data, __be16 proto, int nhoff, int hlen,
			unsigned int flags)
{
	struct flow_dissector_key_control *key_control;
	struct flow_dissector_key_basic *key_basic;
	struct flow_dissector_key_addrs *key_addrs;
	struct flow_dissector_key_arp *key_arp;
	struct flow_dissector_key_ports *key_ports;
	struct flow_dissector_key_icmp *key_icmp;
	struct flow_dissector_key_tags *key_tags;
	struct flow_dissector_key_vlan *key_vlan;
	struct flow_dissector_key_keyid *key_keyid;
	bool skip_vlan = false;
	u8 ip_proto = 0;
	bool ret;

	if (!data) {
		data = skb->data;
		proto = skb_vlan_tag_present(skb) ?
			 skb->vlan_proto : skb->protocol;
		nhoff = skb_network_offset(skb);
		hlen = skb_headlen(skb);
	}

	/* It is ensured by skb_flow_dissector_init() that control key will
         * be always present.
         */
	key_control = skb_flow_dissector_target(flow_dissector,
						FLOW_DISSECTOR_KEY_CONTROL,
						target_container);

	/* It is ensured by skb_flow_dissector_init() that basic key will
         * be always present.
         */
	key_basic = skb_flow_dissector_target(flow_dissector,
					      FLOW_DISSECTOR_KEY_BASIC,
					      target_container);

	if (dissector_uses_key(flow_dissector,
			       FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
		struct ethhdr *eth = eth_hdr(skb);
		struct flow_dissector_key_eth_addrs *key_eth_addrs;

		key_eth_addrs = skb_flow_dissector_target(flow_dissector,
							  FLOW_DISSECTOR_KEY_ETH_ADDRS,
							  target_container);
		memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
	}

again:
	switch (proto) {
	case htons(ETH_P_IP): {
		const struct iphdr *iph;
		struct iphdr _iph;
ip:
		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
		if (!iph || iph->ihl < 5)
			goto out_bad;
		nhoff += iph->ihl * 4;

		ip_proto = iph->protocol;

		if (dissector_uses_key(flow_dissector,
				       FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
			key_addrs = skb_flow_dissector_target(flow_dissector,
							      FLOW_DISSECTOR_KEY_IPV4_ADDRS,
							      target_container);

			memcpy(&key_addrs->v4addrs, &iph->saddr,
			       sizeof(key_addrs->v4addrs));
			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
		}

		if (ip_is_fragment(iph)) {
			key_control->flags |= FLOW_DIS_IS_FRAGMENT;

			if (iph->frag_off & htons(IP_OFFSET)) {
				goto out_good;
			} else {
				key_control->flags |= FLOW_DIS_FIRST_FRAG;
				if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
					goto out_good;
			}
		}

		if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
			goto out_good;

		break;
	}
	case htons(ETH_P_IPV6): {
		const struct ipv6hdr *iph;
		struct ipv6hdr _iph;

ipv6:
		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
		if (!iph)
			goto out_bad;

		ip_proto = iph->nexthdr;
		nhoff += sizeof(struct ipv6hdr);

		if (dissector_uses_key(flow_dissector,
				       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
			key_addrs = skb_flow_dissector_target(flow_dissector,
							      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
							      target_container);

			memcpy(&key_addrs->v6addrs, &iph->saddr,
			       sizeof(key_addrs->v6addrs));
			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
		}

		if ((dissector_uses_key(flow_dissector,
					FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
		     (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
		    ip6_flowlabel(iph)) {
			__be32 flow_label = ip6_flowlabel(iph);

			if (dissector_uses_key(flow_dissector,
					       FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
				key_tags = skb_flow_dissector_target(flow_dissector,
								     FLOW_DISSECTOR_KEY_FLOW_LABEL,
								     target_container);
				key_tags->flow_label = ntohl(flow_label);
			}
			if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
				goto out_good;
		}

		if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
			goto out_good;

		break;
	}
	case htons(ETH_P_8021AD):
	case htons(ETH_P_8021Q): {
		const struct vlan_hdr *vlan;
		struct vlan_hdr _vlan;
		bool vlan_tag_present = skb && skb_vlan_tag_present(skb);

		if (vlan_tag_present)
			proto = skb->protocol;

		if (!vlan_tag_present || eth_type_vlan(skb->protocol)) {
			vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
						    data, hlen, &_vlan);
			if (!vlan)
				goto out_bad;
			proto = vlan->h_vlan_encapsulated_proto;
			nhoff += sizeof(*vlan);
			if (skip_vlan)
				goto again;
		}

		skip_vlan = true;
		if (dissector_uses_key(flow_dissector,
				       FLOW_DISSECTOR_KEY_VLAN)) {
			key_vlan = skb_flow_dissector_target(flow_dissector,
							     FLOW_DISSECTOR_KEY_VLAN,
							     target_container);

			if (vlan_tag_present) {
				key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
				key_vlan->vlan_priority =
					(skb_vlan_tag_get_prio(skb) >> VLAN_PRIO_SHIFT);
			} else {
				key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
					VLAN_VID_MASK;
				key_vlan->vlan_priority =
					(ntohs(vlan->h_vlan_TCI) &
					 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
			}
		}

		goto again;
	}
	case htons(ETH_P_PPP_SES): {
		struct {
			struct pppoe_hdr hdr;
			__be16 proto;
		} *hdr, _hdr;
		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
		if (!hdr)
			goto out_bad;
		proto = hdr->proto;
		nhoff += PPPOE_SES_HLEN;
		switch (proto) {
		case htons(PPP_IP):
			goto ip;
		case htons(PPP_IPV6):
			goto ipv6;
		default:
			goto out_bad;
		}
	}
	case htons(ETH_P_TIPC): {
		struct {
			__be32 pre[3];
			__be32 srcnode;
		} *hdr, _hdr;
		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
		if (!hdr)
			goto out_bad;

		if (dissector_uses_key(flow_dissector,
				       FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
			key_addrs = skb_flow_dissector_target(flow_dissector,
							      FLOW_DISSECTOR_KEY_TIPC_ADDRS,
							      target_container);
			key_addrs->tipcaddrs.srcnode = hdr->srcnode;
			key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
		}
		goto out_good;
	}

	case htons(ETH_P_MPLS_UC):
	case htons(ETH_P_MPLS_MC): {
		struct mpls_label *hdr, _hdr[2];
mpls:
		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
					   hlen, &_hdr);
		if (!hdr)
			goto out_bad;

		if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
		     MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
			if (dissector_uses_key(flow_dissector,
					       FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
				key_keyid = skb_flow_dissector_target(flow_dissector,
								      FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
								      target_container);
				key_keyid->keyid = hdr[1].entry &
					htonl(MPLS_LS_LABEL_MASK);
			}

			goto out_good;
		}

		goto out_good;
	}

	case htons(ETH_P_FCOE):
		if ((hlen - nhoff) < FCOE_HEADER_LEN)
			goto out_bad;

		nhoff += FCOE_HEADER_LEN;
		goto out_good;

	case htons(ETH_P_ARP):
	case htons(ETH_P_RARP): {
		struct {
			unsigned char ar_sha[ETH_ALEN];
			unsigned char ar_sip[4];
			unsigned char ar_tha[ETH_ALEN];
			unsigned char ar_tip[4];
		} *arp_eth, _arp_eth;
		const struct arphdr *arp;
		struct arphdr _arp;

		arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
					   hlen, &_arp);
		if (!arp)
			goto out_bad;

		if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
		    arp->ar_pro != htons(ETH_P_IP) ||
		    arp->ar_hln != ETH_ALEN ||
		    arp->ar_pln != 4 ||
		    (arp->ar_op != htons(ARPOP_REPLY) &&
		     arp->ar_op != htons(ARPOP_REQUEST)))
			goto out_bad;

		arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
					       sizeof(_arp_eth), data,
					       hlen,
					       &_arp_eth);
		if (!arp_eth)
			goto out_bad;

		if (dissector_uses_key(flow_dissector,
				       FLOW_DISSECTOR_KEY_ARP)) {

			key_arp = skb_flow_dissector_target(flow_dissector,
							    FLOW_DISSECTOR_KEY_ARP,
							    target_container);

			memcpy(&key_arp->sip, arp_eth->ar_sip,
			       sizeof(key_arp->sip));
			memcpy(&key_arp->tip, arp_eth->ar_tip,
			       sizeof(key_arp->tip));

			/* Only store the lower byte of the opcode;
                         * this covers ARPOP_REPLY and ARPOP_REQUEST.
                         */
			key_arp->op = ntohs(arp->ar_op) & 0xff;

			ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
			ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
		}

		goto out_good;
	}

	default:
		goto out_bad;
	}

ip_proto_again:
	switch (ip_proto) {
	case IPPROTO_GRE: {
		struct gre_base_hdr *hdr, _hdr;
		u16 gre_ver;
		int offset = 0;

		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
		if (!hdr)
			goto out_bad;

		/* Only look inside GRE without routing */
		if (hdr->flags & GRE_ROUTING)
			break;

		/* Only look inside GRE for version 0 and 1 */
		gre_ver = ntohs(hdr->flags & GRE_VERSION);
		if (gre_ver > 1)
			break;

		proto = hdr->protocol;
		if (gre_ver) {
			/* Version1 must be PPTP, and check the flags */
			if (!(proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
				break;
		}

		offset += sizeof(struct gre_base_hdr);

		if (hdr->flags & GRE_CSUM)
			offset += sizeof(((struct gre_full_hdr *)0)->csum) +
				  sizeof(((struct gre_full_hdr *)0)->reserved1);

		if (hdr->flags & GRE_KEY) {
			const __be32 *keyid;
			__be32 _keyid;

			keyid = __skb_header_pointer(skb, nhoff + offset, sizeof(_keyid),
						     data, hlen, &_keyid);
			if (!keyid)
				goto out_bad;

			if (dissector_uses_key(flow_dissector,
					       FLOW_DISSECTOR_KEY_GRE_KEYID)) {
				key_keyid = skb_flow_dissector_target(flow_dissector,
								      FLOW_DISSECTOR_KEY_GRE_KEYID,
								      target_container);
				if (gre_ver == 0)
					key_keyid->keyid = *keyid;
				else
					key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
			}
			offset += sizeof(((struct gre_full_hdr *)0)->key);
		}

		if (hdr->flags & GRE_SEQ)
			offset += sizeof(((struct pptp_gre_header *)0)->seq);

		if (gre_ver == 0) {
			if (proto == htons(ETH_P_TEB)) {
				const struct ethhdr *eth;
				struct ethhdr _eth;

				eth = __skb_header_pointer(skb, nhoff + offset,
							   sizeof(_eth),
							   data, hlen, &_eth);
				if (!eth)
					goto out_bad;
				proto = eth->h_proto;
				offset += sizeof(*eth);

				/* Cap headers that we access via pointers at the
                                 * end of the Ethernet header as our maximum alignment
                                 * at that point is only 2 bytes.
                                 */
				if (NET_IP_ALIGN)
					hlen = (nhoff + offset);
			}
		} else { /* version 1, must be PPTP */
			u8 _ppp_hdr[PPP_HDRLEN];
			u8 *ppp_hdr;

			if (hdr->flags & GRE_ACK)
				offset += sizeof(((struct pptp_gre_header *)0)->ack);

			ppp_hdr = __skb_header_pointer(skb, nhoff + offset,
						     sizeof(_ppp_hdr),
						     data, hlen, _ppp_hdr);
			if (!ppp_hdr)
				goto out_bad;

			switch (PPP_PROTOCOL(ppp_hdr)) {
			case PPP_IP:
				proto = htons(ETH_P_IP);
				break;
			case PPP_IPV6:
				proto = htons(ETH_P_IPV6);
				break;
			default:
				/* Could probably catch some more like MPLS */
				break;
			}

			offset += PPP_HDRLEN;
		}

		nhoff += offset;
		key_control->flags |= FLOW_DIS_ENCAPSULATION;
		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
			goto out_good;

		goto again;
	}
	case NEXTHDR_HOP:
	case NEXTHDR_ROUTING:
	case NEXTHDR_DEST: {
		u8 _opthdr[2], *opthdr;

		if (proto != htons(ETH_P_IPV6))
			break;

		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
					      data, hlen, &_opthdr);
		if (!opthdr)
			goto out_bad;

		ip_proto = opthdr[0];
		nhoff += (opthdr[1] + 1) << 3;

		goto ip_proto_again;
	}
	case NEXTHDR_FRAGMENT: {
		struct frag_hdr _fh, *fh;

		if (proto != htons(ETH_P_IPV6))
			break;

		fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
					  data, hlen, &_fh);

		if (!fh)
			goto out_bad;

		key_control->flags |= FLOW_DIS_IS_FRAGMENT;

		nhoff += sizeof(_fh);
		ip_proto = fh->nexthdr;

		if (!(fh->frag_off & htons(IP6_OFFSET))) {
			key_control->flags |= FLOW_DIS_FIRST_FRAG;
			if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)
				goto ip_proto_again;
		}
		goto out_good;
	}
	case IPPROTO_IPIP:
		proto = htons(ETH_P_IP);

		key_control->flags |= FLOW_DIS_ENCAPSULATION;
		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
			goto out_good;

		goto ip;
	case IPPROTO_IPV6:
		proto = htons(ETH_P_IPV6);

		key_control->flags |= FLOW_DIS_ENCAPSULATION;
		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
			goto out_good;

		goto ipv6;
	case IPPROTO_MPLS:
		proto = htons(ETH_P_MPLS_UC);
		goto mpls;
	default:
		break;
	}

	if (dissector_uses_key(flow_dissector,
			       FLOW_DISSECTOR_KEY_PORTS)) {
		key_ports = skb_flow_dissector_target(flow_dissector,
						      FLOW_DISSECTOR_KEY_PORTS,
						      target_container);
		key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
							data, hlen);
	}

	if (dissector_uses_key(flow_dissector,
			       FLOW_DISSECTOR_KEY_ICMP)) {
		key_icmp = skb_flow_dissector_target(flow_dissector,
						     FLOW_DISSECTOR_KEY_ICMP,
						     target_container);
		key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen);
	}

out_good:
	ret = true;

	key_control->thoff = (u16)nhoff;
out:
	key_basic->n_proto = proto;
	key_basic->ip_proto = ip_proto;

	return ret;

out_bad:
	ret = false;
	key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
	goto out;
}
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2.38%
1
1.75%
Erik Hugne
51
2.21%
1
1.75%
Américo Wang
19
0.82%
1
1.75%
Arnd Bergmann
16
0.69%
1
1.75%
Joe Perches
7
0.30%
1
1.75%
Jason (Hui) Wang
6
0.26%
1
1.75%
Ian Kumlien
5
0.22%
1
1.75%
Eric Garver
3
0.13%
1
1.75%
Geert Uytterhoeven
2
0.09%
1
1.75%
Colin Ian King
1
0.04%
1
1.75%
Nikolay Aleksandrov
1
0.04%
1
1.75%
Total
2310
100.00%
57
100.00%


EXPORT_SYMBOL(__skb_flow_dissect);


static u32 hashrnd __read_mostly;


static __always_inline void __flow_hash_secret_init(void)
{
	net_get_random_once(&hashrnd, sizeof(hashrnd));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hannes Frederic Sowa
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%



static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
					     u32 keyval)
{
	return jhash2(words, length, keyval);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hannes Frederic Sowa
16
57.14%
1
25.00%
Tom Herbert
11
39.29%
2
50.00%
David S. Miller
1
3.57%
1
25.00%
Total
28
100.00%
4
100.00%



static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
{
	const void *p = flow;

	BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
	return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
29
65.91%
1
50.00%
David S. Miller
15
34.09%
1
50.00%
Total
44
100.00%
2
100.00%



static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
{
	size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
	BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
	BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
		     sizeof(*flow) - sizeof(flow->addrs));

	switch (flow->control.addr_type) {
	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
		diff -= sizeof(flow->addrs.v4addrs);
		break;
	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
		diff -= sizeof(flow->addrs.v6addrs);
		break;
	case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
		diff -= sizeof(flow->addrs.tipcaddrs);
		break;
	}
	return (sizeof(*flow) - diff) / sizeof(u32);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
140
99.29%
3
75.00%
David S. Miller
1
0.71%
1
25.00%
Total
141
100.00%
4
100.00%



__be32 flow_get_u32_src(const struct flow_keys *flow)
{
	switch (flow->control.addr_type) {
	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
		return flow->addrs.v4addrs.src;
	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
		return (__force __be32)ipv6_addr_hash(
			&flow->addrs.v6addrs.src);
	case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
		return flow->addrs.tipcaddrs.srcnode;
	default:
		return 0;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
69
100.00%
2
100.00%
Total
69
100.00%
2
100.00%


EXPORT_SYMBOL(flow_get_u32_src);



__be32 flow_get_u32_dst(const struct flow_keys *flow)
{
	switch (flow->control.addr_type) {
	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
		return flow->addrs.v4addrs.dst;
	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
		return (__force __be32)ipv6_addr_hash