1 #include <linux/kernel.h>
2 #include <linux/skbuff.h>
3 #include <linux/export.h>
5 #include <linux/ipv6.h>
6 #include <linux/if_vlan.h>
9 #include <linux/igmp.h>
10 #include <linux/icmp.h>
11 #include <linux/sctp.h>
12 #include <linux/dccp.h>
13 #include <linux/if_tunnel.h>
14 #include <linux/if_pppox.h>
15 #include <linux/ppp_defs.h>
16 #include <linux/stddef.h>
17 #include <linux/if_ether.h>
18 #include <linux/mpls.h>
19 #include <net/flow_dissector.h>
20 #include <scsi/fc/fc_fcoe.h>
22 static void dissector_set_key(struct flow_dissector *flow_dissector,
23 enum flow_dissector_key_id key_id)
25 flow_dissector->used_keys |= (1 << key_id);
28 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
29 const struct flow_dissector_key *key,
30 unsigned int key_count)
34 memset(flow_dissector, 0, sizeof(*flow_dissector));
36 for (i = 0; i < key_count; i++, key++) {
37 /* User should make sure that every key target offset is withing
38 * boundaries of unsigned short.
40 BUG_ON(key->offset > USHRT_MAX);
41 BUG_ON(dissector_uses_key(flow_dissector,
44 dissector_set_key(flow_dissector, key->key_id);
45 flow_dissector->offset[key->key_id] = key->offset;
48 /* Ensure that the dissector always includes control and basic key.
49 * That way we are able to avoid handling lack of these in fast path.
51 BUG_ON(!dissector_uses_key(flow_dissector,
52 FLOW_DISSECTOR_KEY_CONTROL));
53 BUG_ON(!dissector_uses_key(flow_dissector,
54 FLOW_DISSECTOR_KEY_BASIC));
56 EXPORT_SYMBOL(skb_flow_dissector_init);
59 * __skb_flow_get_ports - extract the upper layer ports and return them
60 * @skb: sk_buff to extract the ports from
61 * @thoff: transport header offset
62 * @ip_proto: protocol for which to get port offset
63 * @data: raw buffer pointer to the packet, if NULL use skb->data
64 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
66 * The function will try to retrieve the ports at offset thoff + poff where poff
67 * is the protocol port offset returned from proto_ports_offset
69 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
72 int poff = proto_ports_offset(ip_proto);
76 hlen = skb_headlen(skb);
80 __be32 *ports, _ports;
82 ports = __skb_header_pointer(skb, thoff + poff,
83 sizeof(_ports), data, hlen, &_ports);
90 EXPORT_SYMBOL(__skb_flow_get_ports);
93 * __skb_flow_dissect - extract the flow_keys struct and return it
94 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
95 * @flow_dissector: list of keys to dissect
96 * @target_container: target structure to put dissected values into
97 * @data: raw buffer pointer to the packet, if NULL use skb->data
98 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
99 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
100 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
102 * The function will try to retrieve individual keys into target specified
103 * by flow_dissector from either the skbuff or a raw buffer specified by the
106 * Caller must take care of zeroing target container memory.
108 bool __skb_flow_dissect(const struct sk_buff *skb,
109 struct flow_dissector *flow_dissector,
110 void *target_container,
111 void *data, __be16 proto, int nhoff, int hlen,
114 struct flow_dissector_key_control *key_control;
115 struct flow_dissector_key_basic *key_basic;
116 struct flow_dissector_key_addrs *key_addrs;
117 struct flow_dissector_key_ports *key_ports;
118 struct flow_dissector_key_tags *key_tags;
119 struct flow_dissector_key_keyid *key_keyid;
125 proto = skb->protocol;
126 nhoff = skb_network_offset(skb);
127 hlen = skb_headlen(skb);
130 /* It is ensured by skb_flow_dissector_init() that control key will
133 key_control = skb_flow_dissector_target(flow_dissector,
134 FLOW_DISSECTOR_KEY_CONTROL,
137 /* It is ensured by skb_flow_dissector_init() that basic key will
140 key_basic = skb_flow_dissector_target(flow_dissector,
141 FLOW_DISSECTOR_KEY_BASIC,
144 if (dissector_uses_key(flow_dissector,
145 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
146 struct ethhdr *eth = eth_hdr(skb);
147 struct flow_dissector_key_eth_addrs *key_eth_addrs;
149 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
150 FLOW_DISSECTOR_KEY_ETH_ADDRS,
152 memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs));
157 case htons(ETH_P_IP): {
158 const struct iphdr *iph;
161 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
162 if (!iph || iph->ihl < 5)
164 nhoff += iph->ihl * 4;
166 ip_proto = iph->protocol;
168 if (dissector_uses_key(flow_dissector,
169 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
170 key_addrs = skb_flow_dissector_target(flow_dissector,
171 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
174 memcpy(&key_addrs->v4addrs, &iph->saddr,
175 sizeof(key_addrs->v4addrs));
176 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
179 if (ip_is_fragment(iph)) {
180 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
182 if (iph->frag_off & htons(IP_OFFSET)) {
185 key_control->flags |= FLOW_DIS_FIRST_FRAG;
186 if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
191 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
196 case htons(ETH_P_IPV6): {
197 const struct ipv6hdr *iph;
201 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
205 ip_proto = iph->nexthdr;
206 nhoff += sizeof(struct ipv6hdr);
208 if (dissector_uses_key(flow_dissector,
209 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
210 key_addrs = skb_flow_dissector_target(flow_dissector,
211 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
214 memcpy(&key_addrs->v6addrs, &iph->saddr,
215 sizeof(key_addrs->v6addrs));
216 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
219 if ((dissector_uses_key(flow_dissector,
220 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
221 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
222 ip6_flowlabel(iph)) {
223 __be32 flow_label = ip6_flowlabel(iph);
225 if (dissector_uses_key(flow_dissector,
226 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
227 key_tags = skb_flow_dissector_target(flow_dissector,
228 FLOW_DISSECTOR_KEY_FLOW_LABEL,
230 key_tags->flow_label = ntohl(flow_label);
232 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
236 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
241 case htons(ETH_P_8021AD):
242 case htons(ETH_P_8021Q): {
243 const struct vlan_hdr *vlan;
244 struct vlan_hdr _vlan;
246 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan);
250 if (dissector_uses_key(flow_dissector,
251 FLOW_DISSECTOR_KEY_VLANID)) {
252 key_tags = skb_flow_dissector_target(flow_dissector,
253 FLOW_DISSECTOR_KEY_VLANID,
256 key_tags->vlan_id = skb_vlan_tag_get_id(skb);
259 proto = vlan->h_vlan_encapsulated_proto;
260 nhoff += sizeof(*vlan);
263 case htons(ETH_P_PPP_SES): {
265 struct pppoe_hdr hdr;
268 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
272 nhoff += PPPOE_SES_HLEN;
276 case htons(PPP_IPV6):
282 case htons(ETH_P_TIPC): {
287 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
291 if (dissector_uses_key(flow_dissector,
292 FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
293 key_addrs = skb_flow_dissector_target(flow_dissector,
294 FLOW_DISSECTOR_KEY_TIPC_ADDRS,
296 key_addrs->tipcaddrs.srcnode = hdr->srcnode;
297 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
302 case htons(ETH_P_MPLS_UC):
303 case htons(ETH_P_MPLS_MC): {
304 struct mpls_label *hdr, _hdr[2];
306 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
311 if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
312 MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
313 if (dissector_uses_key(flow_dissector,
314 FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
315 key_keyid = skb_flow_dissector_target(flow_dissector,
316 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
318 key_keyid->keyid = hdr[1].entry &
319 htonl(MPLS_LS_LABEL_MASK);
328 case htons(ETH_P_FCOE):
329 if ((hlen - nhoff) < FCOE_HEADER_LEN)
332 nhoff += FCOE_HEADER_LEN;
346 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
350 * Only look inside GRE if version zero and no
353 if (hdr->flags & (GRE_VERSION | GRE_ROUTING))
358 if (hdr->flags & GRE_CSUM)
360 if (hdr->flags & GRE_KEY) {
364 keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid),
365 data, hlen, &_keyid);
370 if (dissector_uses_key(flow_dissector,
371 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
372 key_keyid = skb_flow_dissector_target(flow_dissector,
373 FLOW_DISSECTOR_KEY_GRE_KEYID,
375 key_keyid->keyid = *keyid;
379 if (hdr->flags & GRE_SEQ)
381 if (proto == htons(ETH_P_TEB)) {
382 const struct ethhdr *eth;
385 eth = __skb_header_pointer(skb, nhoff,
390 proto = eth->h_proto;
391 nhoff += sizeof(*eth);
393 /* Cap headers that we access via pointers at the
394 * end of the Ethernet header as our maximum alignment
395 * at that point is only 2 bytes.
401 key_control->flags |= FLOW_DIS_ENCAPSULATION;
402 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
408 case NEXTHDR_ROUTING:
410 u8 _opthdr[2], *opthdr;
412 if (proto != htons(ETH_P_IPV6))
415 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
416 data, hlen, &_opthdr);
420 ip_proto = opthdr[0];
421 nhoff += (opthdr[1] + 1) << 3;
425 case NEXTHDR_FRAGMENT: {
426 struct frag_hdr _fh, *fh;
428 if (proto != htons(ETH_P_IPV6))
431 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
437 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
439 nhoff += sizeof(_fh);
440 ip_proto = fh->nexthdr;
442 if (!(fh->frag_off & htons(IP6_OFFSET))) {
443 key_control->flags |= FLOW_DIS_FIRST_FRAG;
444 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)
450 proto = htons(ETH_P_IP);
452 key_control->flags |= FLOW_DIS_ENCAPSULATION;
453 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
458 proto = htons(ETH_P_IPV6);
460 key_control->flags |= FLOW_DIS_ENCAPSULATION;
461 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
466 proto = htons(ETH_P_MPLS_UC);
472 if (dissector_uses_key(flow_dissector,
473 FLOW_DISSECTOR_KEY_PORTS)) {
474 key_ports = skb_flow_dissector_target(flow_dissector,
475 FLOW_DISSECTOR_KEY_PORTS,
477 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
485 key_basic->n_proto = proto;
486 key_basic->ip_proto = ip_proto;
487 key_control->thoff = (u16)nhoff;
491 EXPORT_SYMBOL(__skb_flow_dissect);
493 static u32 hashrnd __read_mostly;
494 static __always_inline void __flow_hash_secret_init(void)
496 net_get_random_once(&hashrnd, sizeof(hashrnd));
499 static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
502 return jhash2(words, length, keyval);
505 static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
507 const void *p = flow;
509 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
510 return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
513 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
515 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
516 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
517 BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
518 sizeof(*flow) - sizeof(flow->addrs));
520 switch (flow->control.addr_type) {
521 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
522 diff -= sizeof(flow->addrs.v4addrs);
524 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
525 diff -= sizeof(flow->addrs.v6addrs);
527 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
528 diff -= sizeof(flow->addrs.tipcaddrs);
531 return (sizeof(*flow) - diff) / sizeof(u32);
534 __be32 flow_get_u32_src(const struct flow_keys *flow)
536 switch (flow->control.addr_type) {
537 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
538 return flow->addrs.v4addrs.src;
539 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
540 return (__force __be32)ipv6_addr_hash(
541 &flow->addrs.v6addrs.src);
542 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
543 return flow->addrs.tipcaddrs.srcnode;
548 EXPORT_SYMBOL(flow_get_u32_src);
550 __be32 flow_get_u32_dst(const struct flow_keys *flow)
552 switch (flow->control.addr_type) {
553 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
554 return flow->addrs.v4addrs.dst;
555 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
556 return (__force __be32)ipv6_addr_hash(
557 &flow->addrs.v6addrs.dst);
562 EXPORT_SYMBOL(flow_get_u32_dst);
564 static inline void __flow_hash_consistentify(struct flow_keys *keys)
568 switch (keys->control.addr_type) {
569 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
570 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
571 (__force u32)keys->addrs.v4addrs.src;
572 if ((addr_diff < 0) ||
574 ((__force u16)keys->ports.dst <
575 (__force u16)keys->ports.src))) {
576 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
577 swap(keys->ports.src, keys->ports.dst);
580 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
581 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
582 &keys->addrs.v6addrs.src,
583 sizeof(keys->addrs.v6addrs.dst));
584 if ((addr_diff < 0) ||
586 ((__force u16)keys->ports.dst <
587 (__force u16)keys->ports.src))) {
588 for (i = 0; i < 4; i++)
589 swap(keys->addrs.v6addrs.src.s6_addr32[i],
590 keys->addrs.v6addrs.dst.s6_addr32[i]);
591 swap(keys->ports.src, keys->ports.dst);
597 static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
601 __flow_hash_consistentify(keys);
603 hash = __flow_hash_words(flow_keys_hash_start(keys),
604 flow_keys_hash_length(keys), keyval);
611 u32 flow_hash_from_keys(struct flow_keys *keys)
613 __flow_hash_secret_init();
614 return __flow_hash_from_keys(keys, hashrnd);
616 EXPORT_SYMBOL(flow_hash_from_keys);
618 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
619 struct flow_keys *keys, u32 keyval)
621 skb_flow_dissect_flow_keys(skb, keys,
622 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
624 return __flow_hash_from_keys(keys, keyval);
627 struct _flow_keys_digest_data {
636 void make_flow_keys_digest(struct flow_keys_digest *digest,
637 const struct flow_keys *flow)
639 struct _flow_keys_digest_data *data =
640 (struct _flow_keys_digest_data *)digest;
642 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
644 memset(digest, 0, sizeof(*digest));
646 data->n_proto = flow->basic.n_proto;
647 data->ip_proto = flow->basic.ip_proto;
648 data->ports = flow->ports.ports;
649 data->src = flow->addrs.v4addrs.src;
650 data->dst = flow->addrs.v4addrs.dst;
652 EXPORT_SYMBOL(make_flow_keys_digest);
654 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
656 u32 __skb_get_hash_symmetric(struct sk_buff *skb)
658 struct flow_keys keys;
660 __flow_hash_secret_init();
662 memset(&keys, 0, sizeof(keys));
663 __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys,
665 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
667 return __flow_hash_from_keys(&keys, hashrnd);
669 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
672 * __skb_get_hash: calculate a flow hash
673 * @skb: sk_buff to calculate flow hash from
675 * This function calculates a flow hash based on src/dst addresses
676 * and src/dst port numbers. Sets hash in skb to non-zero hash value
677 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
678 * if hash is a canonical 4-tuple hash over transport ports.
680 void __skb_get_hash(struct sk_buff *skb)
682 struct flow_keys keys;
685 __flow_hash_secret_init();
687 hash = ___skb_get_hash(skb, &keys, hashrnd);
689 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
691 EXPORT_SYMBOL(__skb_get_hash);
693 __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
695 struct flow_keys keys;
697 return ___skb_get_hash(skb, &keys, perturb);
699 EXPORT_SYMBOL(skb_get_hash_perturb);
701 __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
703 struct flow_keys keys;
705 memset(&keys, 0, sizeof(keys));
707 memcpy(&keys.addrs.v6addrs.src, &fl6->saddr,
708 sizeof(keys.addrs.v6addrs.src));
709 memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr,
710 sizeof(keys.addrs.v6addrs.dst));
711 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
712 keys.ports.src = fl6->fl6_sport;
713 keys.ports.dst = fl6->fl6_dport;
714 keys.keyid.keyid = fl6->fl6_gre_key;
715 keys.tags.flow_label = (__force u32)fl6->flowlabel;
716 keys.basic.ip_proto = fl6->flowi6_proto;
718 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
719 flow_keys_have_l4(&keys));
723 EXPORT_SYMBOL(__skb_get_hash_flowi6);
725 __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4)
727 struct flow_keys keys;
729 memset(&keys, 0, sizeof(keys));
731 keys.addrs.v4addrs.src = fl4->saddr;
732 keys.addrs.v4addrs.dst = fl4->daddr;
733 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
734 keys.ports.src = fl4->fl4_sport;
735 keys.ports.dst = fl4->fl4_dport;
736 keys.keyid.keyid = fl4->fl4_gre_key;
737 keys.basic.ip_proto = fl4->flowi4_proto;
739 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
740 flow_keys_have_l4(&keys));
744 EXPORT_SYMBOL(__skb_get_hash_flowi4);
746 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
747 const struct flow_keys *keys, int hlen)
749 u32 poff = keys->control.thoff;
751 /* skip L4 headers for fragments after the first */
752 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
753 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
756 switch (keys->basic.ip_proto) {
758 /* access doff as u8 to avoid unaligned access */
762 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
767 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
771 case IPPROTO_UDPLITE:
772 poff += sizeof(struct udphdr);
774 /* For the rest, we do not really care about header
775 * extensions at this point for now.
778 poff += sizeof(struct icmphdr);
781 poff += sizeof(struct icmp6hdr);
784 poff += sizeof(struct igmphdr);
787 poff += sizeof(struct dccp_hdr);
790 poff += sizeof(struct sctphdr);
798 * skb_get_poff - get the offset to the payload
799 * @skb: sk_buff to get the payload offset from
801 * The function will get the offset to the payload as far as it could
802 * be dissected. The main user is currently BPF, so that we can dynamically
803 * truncate packets without needing to push actual payload to the user
804 * space and can analyze headers only, instead.
806 u32 skb_get_poff(const struct sk_buff *skb)
808 struct flow_keys keys;
810 if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
813 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
816 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
818 memset(keys, 0, sizeof(*keys));
820 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
821 sizeof(keys->addrs.v6addrs.src));
822 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
823 sizeof(keys->addrs.v6addrs.dst));
824 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
825 keys->ports.src = fl6->fl6_sport;
826 keys->ports.dst = fl6->fl6_dport;
827 keys->keyid.keyid = fl6->fl6_gre_key;
828 keys->tags.flow_label = (__force u32)fl6->flowlabel;
829 keys->basic.ip_proto = fl6->flowi6_proto;
831 return flow_hash_from_keys(keys);
833 EXPORT_SYMBOL(__get_hash_from_flowi6);
835 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
837 memset(keys, 0, sizeof(*keys));
839 keys->addrs.v4addrs.src = fl4->saddr;
840 keys->addrs.v4addrs.dst = fl4->daddr;
841 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
842 keys->ports.src = fl4->fl4_sport;
843 keys->ports.dst = fl4->fl4_dport;
844 keys->keyid.keyid = fl4->fl4_gre_key;
845 keys->basic.ip_proto = fl4->flowi4_proto;
847 return flow_hash_from_keys(keys);
849 EXPORT_SYMBOL(__get_hash_from_flowi4);
851 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
853 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
854 .offset = offsetof(struct flow_keys, control),
857 .key_id = FLOW_DISSECTOR_KEY_BASIC,
858 .offset = offsetof(struct flow_keys, basic),
861 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
862 .offset = offsetof(struct flow_keys, addrs.v4addrs),
865 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
866 .offset = offsetof(struct flow_keys, addrs.v6addrs),
869 .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
870 .offset = offsetof(struct flow_keys, addrs.tipcaddrs),
873 .key_id = FLOW_DISSECTOR_KEY_PORTS,
874 .offset = offsetof(struct flow_keys, ports),
877 .key_id = FLOW_DISSECTOR_KEY_VLANID,
878 .offset = offsetof(struct flow_keys, tags),
881 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
882 .offset = offsetof(struct flow_keys, tags),
885 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
886 .offset = offsetof(struct flow_keys, keyid),
890 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
892 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
893 .offset = offsetof(struct flow_keys, control),
896 .key_id = FLOW_DISSECTOR_KEY_BASIC,
897 .offset = offsetof(struct flow_keys, basic),
900 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
901 .offset = offsetof(struct flow_keys, addrs.v4addrs),
904 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
905 .offset = offsetof(struct flow_keys, addrs.v6addrs),
908 .key_id = FLOW_DISSECTOR_KEY_PORTS,
909 .offset = offsetof(struct flow_keys, ports),
913 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
915 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
916 .offset = offsetof(struct flow_keys, control),
919 .key_id = FLOW_DISSECTOR_KEY_BASIC,
920 .offset = offsetof(struct flow_keys, basic),
924 struct flow_dissector flow_keys_dissector __read_mostly;
925 EXPORT_SYMBOL(flow_keys_dissector);
927 struct flow_dissector flow_keys_buf_dissector __read_mostly;
929 static int __init init_default_flow_dissectors(void)
931 skb_flow_dissector_init(&flow_keys_dissector,
932 flow_keys_dissector_keys,
933 ARRAY_SIZE(flow_keys_dissector_keys));
934 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
935 flow_keys_dissector_symmetric_keys,
936 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
937 skb_flow_dissector_init(&flow_keys_buf_dissector,
938 flow_keys_buf_dissector_keys,
939 ARRAY_SIZE(flow_keys_buf_dissector_keys));
943 late_initcall_sync(init_default_flow_dissectors);