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 bool dissector_uses_key(const struct flow_dissector *flow_dissector,
23 enum flow_dissector_key_id key_id)
25 return flow_dissector->used_keys & (1 << key_id);
28 static void dissector_set_key(struct flow_dissector *flow_dissector,
29 enum flow_dissector_key_id key_id)
31 flow_dissector->used_keys |= (1 << key_id);
34 static void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
35 enum flow_dissector_key_id key_id,
36 void *target_container)
38 return ((char *) target_container) + flow_dissector->offset[key_id];
41 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
42 const struct flow_dissector_key *key,
43 unsigned int key_count)
47 memset(flow_dissector, 0, sizeof(*flow_dissector));
49 for (i = 0; i < key_count; i++, key++) {
50 /* User should make sure that every key target offset is withing
51 * boundaries of unsigned short.
53 BUG_ON(key->offset > USHRT_MAX);
54 BUG_ON(dissector_uses_key(flow_dissector,
57 dissector_set_key(flow_dissector, key->key_id);
58 flow_dissector->offset[key->key_id] = key->offset;
61 /* Ensure that the dissector always includes control and basic key.
62 * That way we are able to avoid handling lack of these in fast path.
64 BUG_ON(!dissector_uses_key(flow_dissector,
65 FLOW_DISSECTOR_KEY_CONTROL));
66 BUG_ON(!dissector_uses_key(flow_dissector,
67 FLOW_DISSECTOR_KEY_BASIC));
69 EXPORT_SYMBOL(skb_flow_dissector_init);
72 * __skb_flow_get_ports - extract the upper layer ports and return them
73 * @skb: sk_buff to extract the ports from
74 * @thoff: transport header offset
75 * @ip_proto: protocol for which to get port offset
76 * @data: raw buffer pointer to the packet, if NULL use skb->data
77 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
79 * The function will try to retrieve the ports at offset thoff + poff where poff
80 * is the protocol port offset returned from proto_ports_offset
82 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
85 int poff = proto_ports_offset(ip_proto);
89 hlen = skb_headlen(skb);
93 __be32 *ports, _ports;
95 ports = __skb_header_pointer(skb, thoff + poff,
96 sizeof(_ports), data, hlen, &_ports);
103 EXPORT_SYMBOL(__skb_flow_get_ports);
106 * __skb_flow_dissect - extract the flow_keys struct and return it
107 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
108 * @flow_dissector: list of keys to dissect
109 * @target_container: target structure to put dissected values into
110 * @data: raw buffer pointer to the packet, if NULL use skb->data
111 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
112 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
113 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
115 * The function will try to retrieve individual keys into target specified
116 * by flow_dissector from either the skbuff or a raw buffer specified by the
119 * Caller must take care of zeroing target container memory.
121 bool __skb_flow_dissect(const struct sk_buff *skb,
122 struct flow_dissector *flow_dissector,
123 void *target_container,
124 void *data, __be16 proto, int nhoff, int hlen,
127 struct flow_dissector_key_control *key_control;
128 struct flow_dissector_key_basic *key_basic;
129 struct flow_dissector_key_addrs *key_addrs;
130 struct flow_dissector_key_ports *key_ports;
131 struct flow_dissector_key_tags *key_tags;
132 struct flow_dissector_key_keyid *key_keyid;
138 proto = skb->protocol;
139 nhoff = skb_network_offset(skb);
140 hlen = skb_headlen(skb);
143 /* It is ensured by skb_flow_dissector_init() that control key will
146 key_control = skb_flow_dissector_target(flow_dissector,
147 FLOW_DISSECTOR_KEY_CONTROL,
150 /* It is ensured by skb_flow_dissector_init() that basic key will
153 key_basic = skb_flow_dissector_target(flow_dissector,
154 FLOW_DISSECTOR_KEY_BASIC,
157 if (dissector_uses_key(flow_dissector,
158 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
159 struct ethhdr *eth = eth_hdr(skb);
160 struct flow_dissector_key_eth_addrs *key_eth_addrs;
162 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
163 FLOW_DISSECTOR_KEY_ETH_ADDRS,
165 memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs));
170 case htons(ETH_P_IP): {
171 const struct iphdr *iph;
174 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
175 if (!iph || iph->ihl < 5)
177 nhoff += iph->ihl * 4;
179 ip_proto = iph->protocol;
181 if (!dissector_uses_key(flow_dissector,
182 FLOW_DISSECTOR_KEY_IPV4_ADDRS))
185 key_addrs = skb_flow_dissector_target(flow_dissector,
186 FLOW_DISSECTOR_KEY_IPV4_ADDRS, target_container);
187 memcpy(&key_addrs->v4addrs, &iph->saddr,
188 sizeof(key_addrs->v4addrs));
189 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
191 if (ip_is_fragment(iph)) {
192 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
194 if (iph->frag_off & htons(IP_OFFSET)) {
197 key_control->flags |= FLOW_DIS_FIRST_FRAG;
198 if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
203 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
208 case htons(ETH_P_IPV6): {
209 const struct ipv6hdr *iph;
213 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
217 ip_proto = iph->nexthdr;
218 nhoff += sizeof(struct ipv6hdr);
220 if (dissector_uses_key(flow_dissector,
221 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
222 struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs;
224 key_ipv6_addrs = skb_flow_dissector_target(flow_dissector,
225 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
228 memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs));
229 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
232 if ((dissector_uses_key(flow_dissector,
233 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
234 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
235 ip6_flowlabel(iph)) {
236 __be32 flow_label = ip6_flowlabel(iph);
238 if (dissector_uses_key(flow_dissector,
239 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
240 key_tags = skb_flow_dissector_target(flow_dissector,
241 FLOW_DISSECTOR_KEY_FLOW_LABEL,
243 key_tags->flow_label = ntohl(flow_label);
245 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
249 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
254 case htons(ETH_P_8021AD):
255 case htons(ETH_P_8021Q): {
256 const struct vlan_hdr *vlan;
257 struct vlan_hdr _vlan;
259 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan);
263 if (dissector_uses_key(flow_dissector,
264 FLOW_DISSECTOR_KEY_VLANID)) {
265 key_tags = skb_flow_dissector_target(flow_dissector,
266 FLOW_DISSECTOR_KEY_VLANID,
269 key_tags->vlan_id = skb_vlan_tag_get_id(skb);
272 proto = vlan->h_vlan_encapsulated_proto;
273 nhoff += sizeof(*vlan);
276 case htons(ETH_P_PPP_SES): {
278 struct pppoe_hdr hdr;
281 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
285 nhoff += PPPOE_SES_HLEN;
289 case htons(PPP_IPV6):
295 case htons(ETH_P_TIPC): {
300 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
304 if (dissector_uses_key(flow_dissector,
305 FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
306 key_addrs = skb_flow_dissector_target(flow_dissector,
307 FLOW_DISSECTOR_KEY_TIPC_ADDRS,
309 key_addrs->tipcaddrs.srcnode = hdr->srcnode;
310 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
315 case htons(ETH_P_MPLS_UC):
316 case htons(ETH_P_MPLS_MC): {
317 struct mpls_label *hdr, _hdr[2];
319 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
324 if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
325 MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
326 if (dissector_uses_key(flow_dissector,
327 FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
328 key_keyid = skb_flow_dissector_target(flow_dissector,
329 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
331 key_keyid->keyid = hdr[1].entry &
332 htonl(MPLS_LS_LABEL_MASK);
341 case htons(ETH_P_FCOE):
342 key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
356 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
360 * Only look inside GRE if version zero and no
363 if (hdr->flags & (GRE_VERSION | GRE_ROUTING))
368 if (hdr->flags & GRE_CSUM)
370 if (hdr->flags & GRE_KEY) {
374 keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid),
375 data, hlen, &_keyid);
380 if (dissector_uses_key(flow_dissector,
381 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
382 key_keyid = skb_flow_dissector_target(flow_dissector,
383 FLOW_DISSECTOR_KEY_GRE_KEYID,
385 key_keyid->keyid = *keyid;
389 if (hdr->flags & GRE_SEQ)
391 if (proto == htons(ETH_P_TEB)) {
392 const struct ethhdr *eth;
395 eth = __skb_header_pointer(skb, nhoff,
400 proto = eth->h_proto;
401 nhoff += sizeof(*eth);
403 /* Cap headers that we access via pointers at the
404 * end of the Ethernet header as our maximum alignment
405 * at that point is only 2 bytes.
411 key_control->flags |= FLOW_DIS_ENCAPSULATION;
412 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
418 case NEXTHDR_ROUTING:
420 u8 _opthdr[2], *opthdr;
422 if (proto != htons(ETH_P_IPV6))
425 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
426 data, hlen, &_opthdr);
430 ip_proto = opthdr[0];
431 nhoff += (opthdr[1] + 1) << 3;
435 case NEXTHDR_FRAGMENT: {
436 struct frag_hdr _fh, *fh;
438 if (proto != htons(ETH_P_IPV6))
441 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
447 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
449 nhoff += sizeof(_fh);
451 if (!(fh->frag_off & htons(IP6_OFFSET))) {
452 key_control->flags |= FLOW_DIS_FIRST_FRAG;
453 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
454 ip_proto = fh->nexthdr;
461 proto = htons(ETH_P_IP);
463 key_control->flags |= FLOW_DIS_ENCAPSULATION;
464 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
469 proto = htons(ETH_P_IPV6);
471 key_control->flags |= FLOW_DIS_ENCAPSULATION;
472 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
477 proto = htons(ETH_P_MPLS_UC);
483 if (dissector_uses_key(flow_dissector,
484 FLOW_DISSECTOR_KEY_PORTS)) {
485 key_ports = skb_flow_dissector_target(flow_dissector,
486 FLOW_DISSECTOR_KEY_PORTS,
488 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
495 key_control->thoff = (u16)nhoff;
497 key_basic->n_proto = proto;
498 key_basic->ip_proto = ip_proto;
504 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
507 EXPORT_SYMBOL(__skb_flow_dissect);
509 static u32 hashrnd __read_mostly;
510 static __always_inline void __flow_hash_secret_init(void)
512 net_get_random_once(&hashrnd, sizeof(hashrnd));
515 static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
518 return jhash2(words, length, keyval);
521 static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
523 const void *p = flow;
525 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
526 return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
529 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
531 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
532 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
533 BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
534 sizeof(*flow) - sizeof(flow->addrs));
536 switch (flow->control.addr_type) {
537 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
538 diff -= sizeof(flow->addrs.v4addrs);
540 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
541 diff -= sizeof(flow->addrs.v6addrs);
543 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
544 diff -= sizeof(flow->addrs.tipcaddrs);
547 return (sizeof(*flow) - diff) / sizeof(u32);
550 __be32 flow_get_u32_src(const struct flow_keys *flow)
552 switch (flow->control.addr_type) {
553 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
554 return flow->addrs.v4addrs.src;
555 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
556 return (__force __be32)ipv6_addr_hash(
557 &flow->addrs.v6addrs.src);
558 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
559 return flow->addrs.tipcaddrs.srcnode;
564 EXPORT_SYMBOL(flow_get_u32_src);
566 __be32 flow_get_u32_dst(const struct flow_keys *flow)
568 switch (flow->control.addr_type) {
569 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
570 return flow->addrs.v4addrs.dst;
571 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
572 return (__force __be32)ipv6_addr_hash(
573 &flow->addrs.v6addrs.dst);
578 EXPORT_SYMBOL(flow_get_u32_dst);
580 static inline void __flow_hash_consistentify(struct flow_keys *keys)
584 switch (keys->control.addr_type) {
585 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
586 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
587 (__force u32)keys->addrs.v4addrs.src;
588 if ((addr_diff < 0) ||
590 ((__force u16)keys->ports.dst <
591 (__force u16)keys->ports.src))) {
592 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
593 swap(keys->ports.src, keys->ports.dst);
596 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
597 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
598 &keys->addrs.v6addrs.src,
599 sizeof(keys->addrs.v6addrs.dst));
600 if ((addr_diff < 0) ||
602 ((__force u16)keys->ports.dst <
603 (__force u16)keys->ports.src))) {
604 for (i = 0; i < 4; i++)
605 swap(keys->addrs.v6addrs.src.s6_addr32[i],
606 keys->addrs.v6addrs.dst.s6_addr32[i]);
607 swap(keys->ports.src, keys->ports.dst);
613 static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
617 __flow_hash_consistentify(keys);
619 hash = __flow_hash_words(flow_keys_hash_start(keys),
620 flow_keys_hash_length(keys), keyval);
627 u32 flow_hash_from_keys(struct flow_keys *keys)
629 __flow_hash_secret_init();
630 return __flow_hash_from_keys(keys, hashrnd);
632 EXPORT_SYMBOL(flow_hash_from_keys);
634 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
635 struct flow_keys *keys, u32 keyval)
637 skb_flow_dissect_flow_keys(skb, keys,
638 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
640 return __flow_hash_from_keys(keys, keyval);
643 struct _flow_keys_digest_data {
652 void make_flow_keys_digest(struct flow_keys_digest *digest,
653 const struct flow_keys *flow)
655 struct _flow_keys_digest_data *data =
656 (struct _flow_keys_digest_data *)digest;
658 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
660 memset(digest, 0, sizeof(*digest));
662 data->n_proto = flow->basic.n_proto;
663 data->ip_proto = flow->basic.ip_proto;
664 data->ports = flow->ports.ports;
665 data->src = flow->addrs.v4addrs.src;
666 data->dst = flow->addrs.v4addrs.dst;
668 EXPORT_SYMBOL(make_flow_keys_digest);
670 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
672 u32 __skb_get_hash_symmetric(struct sk_buff *skb)
674 struct flow_keys keys;
676 __flow_hash_secret_init();
678 memset(&keys, 0, sizeof(keys));
679 __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys,
681 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
683 return __flow_hash_from_keys(&keys, hashrnd);
685 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
688 * __skb_get_hash: calculate a flow hash
689 * @skb: sk_buff to calculate flow hash from
691 * This function calculates a flow hash based on src/dst addresses
692 * and src/dst port numbers. Sets hash in skb to non-zero hash value
693 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
694 * if hash is a canonical 4-tuple hash over transport ports.
696 void __skb_get_hash(struct sk_buff *skb)
698 struct flow_keys keys;
700 __flow_hash_secret_init();
702 __skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd),
703 flow_keys_have_l4(&keys));
705 EXPORT_SYMBOL(__skb_get_hash);
707 __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
709 struct flow_keys keys;
711 return ___skb_get_hash(skb, &keys, perturb);
713 EXPORT_SYMBOL(skb_get_hash_perturb);
715 __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
717 struct flow_keys keys;
719 memset(&keys, 0, sizeof(keys));
721 memcpy(&keys.addrs.v6addrs.src, &fl6->saddr,
722 sizeof(keys.addrs.v6addrs.src));
723 memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr,
724 sizeof(keys.addrs.v6addrs.dst));
725 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
726 keys.ports.src = fl6->fl6_sport;
727 keys.ports.dst = fl6->fl6_dport;
728 keys.keyid.keyid = fl6->fl6_gre_key;
729 keys.tags.flow_label = (__force u32)fl6->flowlabel;
730 keys.basic.ip_proto = fl6->flowi6_proto;
732 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
733 flow_keys_have_l4(&keys));
737 EXPORT_SYMBOL(__skb_get_hash_flowi6);
739 __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4)
741 struct flow_keys keys;
743 memset(&keys, 0, sizeof(keys));
745 keys.addrs.v4addrs.src = fl4->saddr;
746 keys.addrs.v4addrs.dst = fl4->daddr;
747 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
748 keys.ports.src = fl4->fl4_sport;
749 keys.ports.dst = fl4->fl4_dport;
750 keys.keyid.keyid = fl4->fl4_gre_key;
751 keys.basic.ip_proto = fl4->flowi4_proto;
753 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
754 flow_keys_have_l4(&keys));
758 EXPORT_SYMBOL(__skb_get_hash_flowi4);
760 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
761 const struct flow_keys *keys, int hlen)
763 u32 poff = keys->control.thoff;
765 switch (keys->basic.ip_proto) {
767 /* access doff as u8 to avoid unaligned access */
771 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
776 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
780 case IPPROTO_UDPLITE:
781 poff += sizeof(struct udphdr);
783 /* For the rest, we do not really care about header
784 * extensions at this point for now.
787 poff += sizeof(struct icmphdr);
790 poff += sizeof(struct icmp6hdr);
793 poff += sizeof(struct igmphdr);
796 poff += sizeof(struct dccp_hdr);
799 poff += sizeof(struct sctphdr);
807 * skb_get_poff - get the offset to the payload
808 * @skb: sk_buff to get the payload offset from
810 * The function will get the offset to the payload as far as it could
811 * be dissected. The main user is currently BPF, so that we can dynamically
812 * truncate packets without needing to push actual payload to the user
813 * space and can analyze headers only, instead.
815 u32 skb_get_poff(const struct sk_buff *skb)
817 struct flow_keys keys;
819 if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
822 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
825 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
827 memset(keys, 0, sizeof(*keys));
829 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
830 sizeof(keys->addrs.v6addrs.src));
831 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
832 sizeof(keys->addrs.v6addrs.dst));
833 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
834 keys->ports.src = fl6->fl6_sport;
835 keys->ports.dst = fl6->fl6_dport;
836 keys->keyid.keyid = fl6->fl6_gre_key;
837 keys->tags.flow_label = (__force u32)fl6->flowlabel;
838 keys->basic.ip_proto = fl6->flowi6_proto;
840 return flow_hash_from_keys(keys);
842 EXPORT_SYMBOL(__get_hash_from_flowi6);
844 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
846 memset(keys, 0, sizeof(*keys));
848 keys->addrs.v4addrs.src = fl4->saddr;
849 keys->addrs.v4addrs.dst = fl4->daddr;
850 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
851 keys->ports.src = fl4->fl4_sport;
852 keys->ports.dst = fl4->fl4_dport;
853 keys->keyid.keyid = fl4->fl4_gre_key;
854 keys->basic.ip_proto = fl4->flowi4_proto;
856 return flow_hash_from_keys(keys);
858 EXPORT_SYMBOL(__get_hash_from_flowi4);
860 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
862 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
863 .offset = offsetof(struct flow_keys, control),
866 .key_id = FLOW_DISSECTOR_KEY_BASIC,
867 .offset = offsetof(struct flow_keys, basic),
870 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
871 .offset = offsetof(struct flow_keys, addrs.v4addrs),
874 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
875 .offset = offsetof(struct flow_keys, addrs.v6addrs),
878 .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
879 .offset = offsetof(struct flow_keys, addrs.tipcaddrs),
882 .key_id = FLOW_DISSECTOR_KEY_PORTS,
883 .offset = offsetof(struct flow_keys, ports),
886 .key_id = FLOW_DISSECTOR_KEY_VLANID,
887 .offset = offsetof(struct flow_keys, tags),
890 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
891 .offset = offsetof(struct flow_keys, tags),
894 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
895 .offset = offsetof(struct flow_keys, keyid),
899 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
901 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
902 .offset = offsetof(struct flow_keys, control),
905 .key_id = FLOW_DISSECTOR_KEY_BASIC,
906 .offset = offsetof(struct flow_keys, basic),
909 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
910 .offset = offsetof(struct flow_keys, addrs.v4addrs),
913 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
914 .offset = offsetof(struct flow_keys, addrs.v6addrs),
917 .key_id = FLOW_DISSECTOR_KEY_PORTS,
918 .offset = offsetof(struct flow_keys, ports),
922 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
924 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
925 .offset = offsetof(struct flow_keys, control),
928 .key_id = FLOW_DISSECTOR_KEY_BASIC,
929 .offset = offsetof(struct flow_keys, basic),
933 struct flow_dissector flow_keys_dissector __read_mostly;
934 EXPORT_SYMBOL(flow_keys_dissector);
936 struct flow_dissector flow_keys_buf_dissector __read_mostly;
938 static int __init init_default_flow_dissectors(void)
940 skb_flow_dissector_init(&flow_keys_dissector,
941 flow_keys_dissector_keys,
942 ARRAY_SIZE(flow_keys_dissector_keys));
943 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
944 flow_keys_dissector_symmetric_keys,
945 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
946 skb_flow_dissector_init(&flow_keys_buf_dissector,
947 flow_keys_buf_dissector_keys,
948 ARRAY_SIZE(flow_keys_buf_dissector_keys));
952 core_initcall(init_default_flow_dissectors);