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);
404 key_control->flags |= FLOW_DIS_ENCAPSULATION;
405 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
411 case NEXTHDR_ROUTING:
413 u8 _opthdr[2], *opthdr;
415 if (proto != htons(ETH_P_IPV6))
418 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
419 data, hlen, &_opthdr);
423 ip_proto = opthdr[0];
424 nhoff += (opthdr[1] + 1) << 3;
428 case NEXTHDR_FRAGMENT: {
429 struct frag_hdr _fh, *fh;
431 if (proto != htons(ETH_P_IPV6))
434 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
440 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
442 nhoff += sizeof(_fh);
444 if (!(fh->frag_off & htons(IP6_OFFSET))) {
445 key_control->flags |= FLOW_DIS_FIRST_FRAG;
446 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
447 ip_proto = fh->nexthdr;
454 proto = htons(ETH_P_IP);
456 key_control->flags |= FLOW_DIS_ENCAPSULATION;
457 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
462 proto = htons(ETH_P_IPV6);
464 key_control->flags |= FLOW_DIS_ENCAPSULATION;
465 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
470 proto = htons(ETH_P_MPLS_UC);
476 if (dissector_uses_key(flow_dissector,
477 FLOW_DISSECTOR_KEY_PORTS)) {
478 key_ports = skb_flow_dissector_target(flow_dissector,
479 FLOW_DISSECTOR_KEY_PORTS,
481 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
489 key_basic->n_proto = proto;
490 key_basic->ip_proto = ip_proto;
491 key_control->thoff = (u16)nhoff;
495 EXPORT_SYMBOL(__skb_flow_dissect);
497 static u32 hashrnd __read_mostly;
498 static __always_inline void __flow_hash_secret_init(void)
500 net_get_random_once(&hashrnd, sizeof(hashrnd));
503 static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
506 return jhash2(words, length, keyval);
509 static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
511 const void *p = flow;
513 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
514 return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
517 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
519 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
520 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
521 BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
522 sizeof(*flow) - sizeof(flow->addrs));
524 switch (flow->control.addr_type) {
525 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
526 diff -= sizeof(flow->addrs.v4addrs);
528 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
529 diff -= sizeof(flow->addrs.v6addrs);
531 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
532 diff -= sizeof(flow->addrs.tipcaddrs);
535 return (sizeof(*flow) - diff) / sizeof(u32);
538 __be32 flow_get_u32_src(const struct flow_keys *flow)
540 switch (flow->control.addr_type) {
541 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
542 return flow->addrs.v4addrs.src;
543 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
544 return (__force __be32)ipv6_addr_hash(
545 &flow->addrs.v6addrs.src);
546 case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
547 return flow->addrs.tipcaddrs.srcnode;
552 EXPORT_SYMBOL(flow_get_u32_src);
554 __be32 flow_get_u32_dst(const struct flow_keys *flow)
556 switch (flow->control.addr_type) {
557 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
558 return flow->addrs.v4addrs.dst;
559 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
560 return (__force __be32)ipv6_addr_hash(
561 &flow->addrs.v6addrs.dst);
566 EXPORT_SYMBOL(flow_get_u32_dst);
568 static inline void __flow_hash_consistentify(struct flow_keys *keys)
572 switch (keys->control.addr_type) {
573 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
574 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
575 (__force u32)keys->addrs.v4addrs.src;
576 if ((addr_diff < 0) ||
578 ((__force u16)keys->ports.dst <
579 (__force u16)keys->ports.src))) {
580 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
581 swap(keys->ports.src, keys->ports.dst);
584 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
585 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
586 &keys->addrs.v6addrs.src,
587 sizeof(keys->addrs.v6addrs.dst));
588 if ((addr_diff < 0) ||
590 ((__force u16)keys->ports.dst <
591 (__force u16)keys->ports.src))) {
592 for (i = 0; i < 4; i++)
593 swap(keys->addrs.v6addrs.src.s6_addr32[i],
594 keys->addrs.v6addrs.dst.s6_addr32[i]);
595 swap(keys->ports.src, keys->ports.dst);
601 static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
605 __flow_hash_consistentify(keys);
607 hash = __flow_hash_words(flow_keys_hash_start(keys),
608 flow_keys_hash_length(keys), keyval);
615 u32 flow_hash_from_keys(struct flow_keys *keys)
617 __flow_hash_secret_init();
618 return __flow_hash_from_keys(keys, hashrnd);
620 EXPORT_SYMBOL(flow_hash_from_keys);
622 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
623 struct flow_keys *keys, u32 keyval)
625 skb_flow_dissect_flow_keys(skb, keys,
626 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
628 return __flow_hash_from_keys(keys, keyval);
631 struct _flow_keys_digest_data {
640 void make_flow_keys_digest(struct flow_keys_digest *digest,
641 const struct flow_keys *flow)
643 struct _flow_keys_digest_data *data =
644 (struct _flow_keys_digest_data *)digest;
646 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
648 memset(digest, 0, sizeof(*digest));
650 data->n_proto = flow->basic.n_proto;
651 data->ip_proto = flow->basic.ip_proto;
652 data->ports = flow->ports.ports;
653 data->src = flow->addrs.v4addrs.src;
654 data->dst = flow->addrs.v4addrs.dst;
656 EXPORT_SYMBOL(make_flow_keys_digest);
659 * __skb_get_hash: calculate a flow hash
660 * @skb: sk_buff to calculate flow hash from
662 * This function calculates a flow hash based on src/dst addresses
663 * and src/dst port numbers. Sets hash in skb to non-zero hash value
664 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
665 * if hash is a canonical 4-tuple hash over transport ports.
667 void __skb_get_hash(struct sk_buff *skb)
669 struct flow_keys keys;
671 __flow_hash_secret_init();
673 __skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd),
674 flow_keys_have_l4(&keys));
676 EXPORT_SYMBOL(__skb_get_hash);
678 __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
680 struct flow_keys keys;
682 return ___skb_get_hash(skb, &keys, perturb);
684 EXPORT_SYMBOL(skb_get_hash_perturb);
686 __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
688 struct flow_keys keys;
690 memset(&keys, 0, sizeof(keys));
692 memcpy(&keys.addrs.v6addrs.src, &fl6->saddr,
693 sizeof(keys.addrs.v6addrs.src));
694 memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr,
695 sizeof(keys.addrs.v6addrs.dst));
696 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
697 keys.ports.src = fl6->fl6_sport;
698 keys.ports.dst = fl6->fl6_dport;
699 keys.keyid.keyid = fl6->fl6_gre_key;
700 keys.tags.flow_label = (__force u32)fl6->flowlabel;
701 keys.basic.ip_proto = fl6->flowi6_proto;
703 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
704 flow_keys_have_l4(&keys));
708 EXPORT_SYMBOL(__skb_get_hash_flowi6);
710 __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4)
712 struct flow_keys keys;
714 memset(&keys, 0, sizeof(keys));
716 keys.addrs.v4addrs.src = fl4->saddr;
717 keys.addrs.v4addrs.dst = fl4->daddr;
718 keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
719 keys.ports.src = fl4->fl4_sport;
720 keys.ports.dst = fl4->fl4_dport;
721 keys.keyid.keyid = fl4->fl4_gre_key;
722 keys.basic.ip_proto = fl4->flowi4_proto;
724 __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
725 flow_keys_have_l4(&keys));
729 EXPORT_SYMBOL(__skb_get_hash_flowi4);
731 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
732 const struct flow_keys *keys, int hlen)
734 u32 poff = keys->control.thoff;
736 switch (keys->basic.ip_proto) {
738 /* access doff as u8 to avoid unaligned access */
742 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
747 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
751 case IPPROTO_UDPLITE:
752 poff += sizeof(struct udphdr);
754 /* For the rest, we do not really care about header
755 * extensions at this point for now.
758 poff += sizeof(struct icmphdr);
761 poff += sizeof(struct icmp6hdr);
764 poff += sizeof(struct igmphdr);
767 poff += sizeof(struct dccp_hdr);
770 poff += sizeof(struct sctphdr);
778 * skb_get_poff - get the offset to the payload
779 * @skb: sk_buff to get the payload offset from
781 * The function will get the offset to the payload as far as it could
782 * be dissected. The main user is currently BPF, so that we can dynamically
783 * truncate packets without needing to push actual payload to the user
784 * space and can analyze headers only, instead.
786 u32 skb_get_poff(const struct sk_buff *skb)
788 struct flow_keys keys;
790 if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
793 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
796 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
798 memset(keys, 0, sizeof(*keys));
800 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
801 sizeof(keys->addrs.v6addrs.src));
802 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
803 sizeof(keys->addrs.v6addrs.dst));
804 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
805 keys->ports.src = fl6->fl6_sport;
806 keys->ports.dst = fl6->fl6_dport;
807 keys->keyid.keyid = fl6->fl6_gre_key;
808 keys->tags.flow_label = (__force u32)fl6->flowlabel;
809 keys->basic.ip_proto = fl6->flowi6_proto;
811 return flow_hash_from_keys(keys);
813 EXPORT_SYMBOL(__get_hash_from_flowi6);
815 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
817 memset(keys, 0, sizeof(*keys));
819 keys->addrs.v4addrs.src = fl4->saddr;
820 keys->addrs.v4addrs.dst = fl4->daddr;
821 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
822 keys->ports.src = fl4->fl4_sport;
823 keys->ports.dst = fl4->fl4_dport;
824 keys->keyid.keyid = fl4->fl4_gre_key;
825 keys->basic.ip_proto = fl4->flowi4_proto;
827 return flow_hash_from_keys(keys);
829 EXPORT_SYMBOL(__get_hash_from_flowi4);
831 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
833 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
834 .offset = offsetof(struct flow_keys, control),
837 .key_id = FLOW_DISSECTOR_KEY_BASIC,
838 .offset = offsetof(struct flow_keys, basic),
841 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
842 .offset = offsetof(struct flow_keys, addrs.v4addrs),
845 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
846 .offset = offsetof(struct flow_keys, addrs.v6addrs),
849 .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
850 .offset = offsetof(struct flow_keys, addrs.tipcaddrs),
853 .key_id = FLOW_DISSECTOR_KEY_PORTS,
854 .offset = offsetof(struct flow_keys, ports),
857 .key_id = FLOW_DISSECTOR_KEY_VLANID,
858 .offset = offsetof(struct flow_keys, tags),
861 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
862 .offset = offsetof(struct flow_keys, tags),
865 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
866 .offset = offsetof(struct flow_keys, keyid),
870 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
872 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
873 .offset = offsetof(struct flow_keys, control),
876 .key_id = FLOW_DISSECTOR_KEY_BASIC,
877 .offset = offsetof(struct flow_keys, basic),
881 struct flow_dissector flow_keys_dissector __read_mostly;
882 EXPORT_SYMBOL(flow_keys_dissector);
884 struct flow_dissector flow_keys_buf_dissector __read_mostly;
886 static int __init init_default_flow_dissectors(void)
888 skb_flow_dissector_init(&flow_keys_dissector,
889 flow_keys_dissector_keys,
890 ARRAY_SIZE(flow_keys_dissector_keys));
891 skb_flow_dissector_init(&flow_keys_buf_dissector,
892 flow_keys_buf_dissector_keys,
893 ARRAY_SIZE(flow_keys_buf_dissector_keys));
897 late_initcall_sync(init_default_flow_dissectors);