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>
11 #include <linux/igmp.h>
12 #include <linux/icmp.h>
13 #include <linux/sctp.h>
14 #include <linux/dccp.h>
15 #include <linux/if_tunnel.h>
16 #include <linux/if_pppox.h>
17 #include <linux/ppp_defs.h>
18 #include <linux/stddef.h>
19 #include <linux/if_ether.h>
20 #include <linux/mpls.h>
21 #include <net/flow_dissector.h>
22 #include <scsi/fc/fc_fcoe.h>
24 static void dissector_set_key(struct flow_dissector
*flow_dissector
,
25 enum flow_dissector_key_id key_id
)
27 flow_dissector
->used_keys
|= (1 << key_id
);
30 void skb_flow_dissector_init(struct flow_dissector
*flow_dissector
,
31 const struct flow_dissector_key
*key
,
32 unsigned int key_count
)
36 memset(flow_dissector
, 0, sizeof(*flow_dissector
));
38 for (i
= 0; i
< key_count
; i
++, key
++) {
39 /* User should make sure that every key target offset is withing
40 * boundaries of unsigned short.
42 BUG_ON(key
->offset
> USHRT_MAX
);
43 BUG_ON(dissector_uses_key(flow_dissector
,
46 dissector_set_key(flow_dissector
, key
->key_id
);
47 flow_dissector
->offset
[key
->key_id
] = key
->offset
;
50 /* Ensure that the dissector always includes control and basic key.
51 * That way we are able to avoid handling lack of these in fast path.
53 BUG_ON(!dissector_uses_key(flow_dissector
,
54 FLOW_DISSECTOR_KEY_CONTROL
));
55 BUG_ON(!dissector_uses_key(flow_dissector
,
56 FLOW_DISSECTOR_KEY_BASIC
));
58 EXPORT_SYMBOL(skb_flow_dissector_init
);
61 * __skb_flow_get_ports - extract the upper layer ports and return them
62 * @skb: sk_buff to extract the ports from
63 * @thoff: transport header offset
64 * @ip_proto: protocol for which to get port offset
65 * @data: raw buffer pointer to the packet, if NULL use skb->data
66 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
68 * The function will try to retrieve the ports at offset thoff + poff where poff
69 * is the protocol port offset returned from proto_ports_offset
71 __be32
__skb_flow_get_ports(const struct sk_buff
*skb
, int thoff
, u8 ip_proto
,
74 int poff
= proto_ports_offset(ip_proto
);
78 hlen
= skb_headlen(skb
);
82 __be32
*ports
, _ports
;
84 ports
= __skb_header_pointer(skb
, thoff
+ poff
,
85 sizeof(_ports
), data
, hlen
, &_ports
);
92 EXPORT_SYMBOL(__skb_flow_get_ports
);
95 * __skb_flow_dissect - extract the flow_keys struct and return it
96 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
97 * @flow_dissector: list of keys to dissect
98 * @target_container: target structure to put dissected values into
99 * @data: raw buffer pointer to the packet, if NULL use skb->data
100 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
101 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
102 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
104 * The function will try to retrieve individual keys into target specified
105 * by flow_dissector from either the skbuff or a raw buffer specified by the
108 * Caller must take care of zeroing target container memory.
110 bool __skb_flow_dissect(const struct sk_buff
*skb
,
111 struct flow_dissector
*flow_dissector
,
112 void *target_container
,
113 void *data
, __be16 proto
, int nhoff
, int hlen
,
116 struct flow_dissector_key_control
*key_control
;
117 struct flow_dissector_key_basic
*key_basic
;
118 struct flow_dissector_key_addrs
*key_addrs
;
119 struct flow_dissector_key_ports
*key_ports
;
120 struct flow_dissector_key_tags
*key_tags
;
121 struct flow_dissector_key_vlan
*key_vlan
;
122 struct flow_dissector_key_keyid
*key_keyid
;
123 bool skip_vlan
= false;
129 proto
= skb_vlan_tag_present(skb
) ?
130 skb
->vlan_proto
: skb
->protocol
;
131 nhoff
= skb_network_offset(skb
);
132 hlen
= skb_headlen(skb
);
135 /* It is ensured by skb_flow_dissector_init() that control key will
138 key_control
= skb_flow_dissector_target(flow_dissector
,
139 FLOW_DISSECTOR_KEY_CONTROL
,
142 /* It is ensured by skb_flow_dissector_init() that basic key will
145 key_basic
= skb_flow_dissector_target(flow_dissector
,
146 FLOW_DISSECTOR_KEY_BASIC
,
149 if (dissector_uses_key(flow_dissector
,
150 FLOW_DISSECTOR_KEY_ETH_ADDRS
)) {
151 struct ethhdr
*eth
= eth_hdr(skb
);
152 struct flow_dissector_key_eth_addrs
*key_eth_addrs
;
154 key_eth_addrs
= skb_flow_dissector_target(flow_dissector
,
155 FLOW_DISSECTOR_KEY_ETH_ADDRS
,
157 memcpy(key_eth_addrs
, ð
->h_dest
, sizeof(*key_eth_addrs
));
162 case htons(ETH_P_IP
): {
163 const struct iphdr
*iph
;
166 iph
= __skb_header_pointer(skb
, nhoff
, sizeof(_iph
), data
, hlen
, &_iph
);
167 if (!iph
|| iph
->ihl
< 5)
169 nhoff
+= iph
->ihl
* 4;
171 ip_proto
= iph
->protocol
;
173 if (dissector_uses_key(flow_dissector
,
174 FLOW_DISSECTOR_KEY_IPV4_ADDRS
)) {
175 key_addrs
= skb_flow_dissector_target(flow_dissector
,
176 FLOW_DISSECTOR_KEY_IPV4_ADDRS
,
179 memcpy(&key_addrs
->v4addrs
, &iph
->saddr
,
180 sizeof(key_addrs
->v4addrs
));
181 key_control
->addr_type
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
;
184 if (ip_is_fragment(iph
)) {
185 key_control
->flags
|= FLOW_DIS_IS_FRAGMENT
;
187 if (iph
->frag_off
& htons(IP_OFFSET
)) {
190 key_control
->flags
|= FLOW_DIS_FIRST_FRAG
;
191 if (!(flags
& FLOW_DISSECTOR_F_PARSE_1ST_FRAG
))
196 if (flags
& FLOW_DISSECTOR_F_STOP_AT_L3
)
201 case htons(ETH_P_IPV6
): {
202 const struct ipv6hdr
*iph
;
206 iph
= __skb_header_pointer(skb
, nhoff
, sizeof(_iph
), data
, hlen
, &_iph
);
210 ip_proto
= iph
->nexthdr
;
211 nhoff
+= sizeof(struct ipv6hdr
);
213 if (dissector_uses_key(flow_dissector
,
214 FLOW_DISSECTOR_KEY_IPV6_ADDRS
)) {
215 key_addrs
= skb_flow_dissector_target(flow_dissector
,
216 FLOW_DISSECTOR_KEY_IPV6_ADDRS
,
219 memcpy(&key_addrs
->v6addrs
, &iph
->saddr
,
220 sizeof(key_addrs
->v6addrs
));
221 key_control
->addr_type
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
;
224 if ((dissector_uses_key(flow_dissector
,
225 FLOW_DISSECTOR_KEY_FLOW_LABEL
) ||
226 (flags
& FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL
)) &&
227 ip6_flowlabel(iph
)) {
228 __be32 flow_label
= ip6_flowlabel(iph
);
230 if (dissector_uses_key(flow_dissector
,
231 FLOW_DISSECTOR_KEY_FLOW_LABEL
)) {
232 key_tags
= skb_flow_dissector_target(flow_dissector
,
233 FLOW_DISSECTOR_KEY_FLOW_LABEL
,
235 key_tags
->flow_label
= ntohl(flow_label
);
237 if (flags
& FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL
)
241 if (flags
& FLOW_DISSECTOR_F_STOP_AT_L3
)
246 case htons(ETH_P_8021AD
):
247 case htons(ETH_P_8021Q
): {
248 const struct vlan_hdr
*vlan
;
250 if (skb_vlan_tag_present(skb
))
251 proto
= skb
->protocol
;
253 if (!skb_vlan_tag_present(skb
) ||
254 proto
== cpu_to_be16(ETH_P_8021Q
) ||
255 proto
== cpu_to_be16(ETH_P_8021AD
)) {
256 struct vlan_hdr _vlan
;
258 vlan
= __skb_header_pointer(skb
, nhoff
, sizeof(_vlan
),
262 proto
= vlan
->h_vlan_encapsulated_proto
;
263 nhoff
+= sizeof(*vlan
);
269 if (dissector_uses_key(flow_dissector
,
270 FLOW_DISSECTOR_KEY_VLAN
)) {
271 key_vlan
= skb_flow_dissector_target(flow_dissector
,
272 FLOW_DISSECTOR_KEY_VLAN
,
275 if (skb_vlan_tag_present(skb
)) {
276 key_vlan
->vlan_id
= skb_vlan_tag_get_id(skb
);
277 key_vlan
->vlan_priority
=
278 (skb_vlan_tag_get_prio(skb
) >> VLAN_PRIO_SHIFT
);
280 key_vlan
->vlan_id
= ntohs(vlan
->h_vlan_TCI
) &
282 key_vlan
->vlan_priority
=
283 (ntohs(vlan
->h_vlan_TCI
) &
284 VLAN_PRIO_MASK
) >> VLAN_PRIO_SHIFT
;
290 case htons(ETH_P_PPP_SES
): {
292 struct pppoe_hdr hdr
;
295 hdr
= __skb_header_pointer(skb
, nhoff
, sizeof(_hdr
), data
, hlen
, &_hdr
);
299 nhoff
+= PPPOE_SES_HLEN
;
303 case htons(PPP_IPV6
):
309 case htons(ETH_P_TIPC
): {
314 hdr
= __skb_header_pointer(skb
, nhoff
, sizeof(_hdr
), data
, hlen
, &_hdr
);
318 if (dissector_uses_key(flow_dissector
,
319 FLOW_DISSECTOR_KEY_TIPC_ADDRS
)) {
320 key_addrs
= skb_flow_dissector_target(flow_dissector
,
321 FLOW_DISSECTOR_KEY_TIPC_ADDRS
,
323 key_addrs
->tipcaddrs
.srcnode
= hdr
->srcnode
;
324 key_control
->addr_type
= FLOW_DISSECTOR_KEY_TIPC_ADDRS
;
329 case htons(ETH_P_MPLS_UC
):
330 case htons(ETH_P_MPLS_MC
): {
331 struct mpls_label
*hdr
, _hdr
[2];
333 hdr
= __skb_header_pointer(skb
, nhoff
, sizeof(_hdr
), data
,
338 if ((ntohl(hdr
[0].entry
) & MPLS_LS_LABEL_MASK
) >>
339 MPLS_LS_LABEL_SHIFT
== MPLS_LABEL_ENTROPY
) {
340 if (dissector_uses_key(flow_dissector
,
341 FLOW_DISSECTOR_KEY_MPLS_ENTROPY
)) {
342 key_keyid
= skb_flow_dissector_target(flow_dissector
,
343 FLOW_DISSECTOR_KEY_MPLS_ENTROPY
,
345 key_keyid
->keyid
= hdr
[1].entry
&
346 htonl(MPLS_LS_LABEL_MASK
);
355 case htons(ETH_P_FCOE
):
356 if ((hlen
- nhoff
) < FCOE_HEADER_LEN
)
359 nhoff
+= FCOE_HEADER_LEN
;
368 struct gre_base_hdr
*hdr
, _hdr
;
372 hdr
= __skb_header_pointer(skb
, nhoff
, sizeof(_hdr
), data
, hlen
, &_hdr
);
376 /* Only look inside GRE without routing */
377 if (hdr
->flags
& GRE_ROUTING
)
380 /* Only look inside GRE for version 0 and 1 */
381 gre_ver
= ntohs(hdr
->flags
& GRE_VERSION
);
385 proto
= hdr
->protocol
;
387 /* Version1 must be PPTP, and check the flags */
388 if (!(proto
== GRE_PROTO_PPP
&& (hdr
->flags
& GRE_KEY
)))
392 offset
+= sizeof(struct gre_base_hdr
);
394 if (hdr
->flags
& GRE_CSUM
)
395 offset
+= sizeof(((struct gre_full_hdr
*)0)->csum
) +
396 sizeof(((struct gre_full_hdr
*)0)->reserved1
);
398 if (hdr
->flags
& GRE_KEY
) {
402 keyid
= __skb_header_pointer(skb
, nhoff
+ offset
, sizeof(_keyid
),
403 data
, hlen
, &_keyid
);
407 if (dissector_uses_key(flow_dissector
,
408 FLOW_DISSECTOR_KEY_GRE_KEYID
)) {
409 key_keyid
= skb_flow_dissector_target(flow_dissector
,
410 FLOW_DISSECTOR_KEY_GRE_KEYID
,
413 key_keyid
->keyid
= *keyid
;
415 key_keyid
->keyid
= *keyid
& GRE_PPTP_KEY_MASK
;
417 offset
+= sizeof(((struct gre_full_hdr
*)0)->key
);
420 if (hdr
->flags
& GRE_SEQ
)
421 offset
+= sizeof(((struct pptp_gre_header
*)0)->seq
);
424 if (proto
== htons(ETH_P_TEB
)) {
425 const struct ethhdr
*eth
;
428 eth
= __skb_header_pointer(skb
, nhoff
+ offset
,
433 proto
= eth
->h_proto
;
434 offset
+= sizeof(*eth
);
436 /* Cap headers that we access via pointers at the
437 * end of the Ethernet header as our maximum alignment
438 * at that point is only 2 bytes.
441 hlen
= (nhoff
+ offset
);
443 } else { /* version 1, must be PPTP */
444 u8 _ppp_hdr
[PPP_HDRLEN
];
447 if (hdr
->flags
& GRE_ACK
)
448 offset
+= sizeof(((struct pptp_gre_header
*)0)->ack
);
450 ppp_hdr
= skb_header_pointer(skb
, nhoff
+ offset
,
451 sizeof(_ppp_hdr
), _ppp_hdr
);
455 switch (PPP_PROTOCOL(ppp_hdr
)) {
457 proto
= htons(ETH_P_IP
);
460 proto
= htons(ETH_P_IPV6
);
463 /* Could probably catch some more like MPLS */
467 offset
+= PPP_HDRLEN
;
471 key_control
->flags
|= FLOW_DIS_ENCAPSULATION
;
472 if (flags
& FLOW_DISSECTOR_F_STOP_AT_ENCAP
)
478 case NEXTHDR_ROUTING
:
480 u8 _opthdr
[2], *opthdr
;
482 if (proto
!= htons(ETH_P_IPV6
))
485 opthdr
= __skb_header_pointer(skb
, nhoff
, sizeof(_opthdr
),
486 data
, hlen
, &_opthdr
);
490 ip_proto
= opthdr
[0];
491 nhoff
+= (opthdr
[1] + 1) << 3;
495 case NEXTHDR_FRAGMENT
: {
496 struct frag_hdr _fh
, *fh
;
498 if (proto
!= htons(ETH_P_IPV6
))
501 fh
= __skb_header_pointer(skb
, nhoff
, sizeof(_fh
),
507 key_control
->flags
|= FLOW_DIS_IS_FRAGMENT
;
509 nhoff
+= sizeof(_fh
);
510 ip_proto
= fh
->nexthdr
;
512 if (!(fh
->frag_off
& htons(IP6_OFFSET
))) {
513 key_control
->flags
|= FLOW_DIS_FIRST_FRAG
;
514 if (flags
& FLOW_DISSECTOR_F_PARSE_1ST_FRAG
)
520 proto
= htons(ETH_P_IP
);
522 key_control
->flags
|= FLOW_DIS_ENCAPSULATION
;
523 if (flags
& FLOW_DISSECTOR_F_STOP_AT_ENCAP
)
528 proto
= htons(ETH_P_IPV6
);
530 key_control
->flags
|= FLOW_DIS_ENCAPSULATION
;
531 if (flags
& FLOW_DISSECTOR_F_STOP_AT_ENCAP
)
536 proto
= htons(ETH_P_MPLS_UC
);
542 if (dissector_uses_key(flow_dissector
,
543 FLOW_DISSECTOR_KEY_PORTS
)) {
544 key_ports
= skb_flow_dissector_target(flow_dissector
,
545 FLOW_DISSECTOR_KEY_PORTS
,
547 key_ports
->ports
= __skb_flow_get_ports(skb
, nhoff
, ip_proto
,
555 key_basic
->n_proto
= proto
;
556 key_basic
->ip_proto
= ip_proto
;
557 key_control
->thoff
= (u16
)nhoff
;
561 EXPORT_SYMBOL(__skb_flow_dissect
);
563 static u32 hashrnd __read_mostly
;
564 static __always_inline
void __flow_hash_secret_init(void)
566 net_get_random_once(&hashrnd
, sizeof(hashrnd
));
569 static __always_inline u32
__flow_hash_words(const u32
*words
, u32 length
,
572 return jhash2(words
, length
, keyval
);
575 static inline const u32
*flow_keys_hash_start(const struct flow_keys
*flow
)
577 const void *p
= flow
;
579 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET
% sizeof(u32
));
580 return (const u32
*)(p
+ FLOW_KEYS_HASH_OFFSET
);
583 static inline size_t flow_keys_hash_length(const struct flow_keys
*flow
)
585 size_t diff
= FLOW_KEYS_HASH_OFFSET
+ sizeof(flow
->addrs
);
586 BUILD_BUG_ON((sizeof(*flow
) - FLOW_KEYS_HASH_OFFSET
) % sizeof(u32
));
587 BUILD_BUG_ON(offsetof(typeof(*flow
), addrs
) !=
588 sizeof(*flow
) - sizeof(flow
->addrs
));
590 switch (flow
->control
.addr_type
) {
591 case FLOW_DISSECTOR_KEY_IPV4_ADDRS
:
592 diff
-= sizeof(flow
->addrs
.v4addrs
);
594 case FLOW_DISSECTOR_KEY_IPV6_ADDRS
:
595 diff
-= sizeof(flow
->addrs
.v6addrs
);
597 case FLOW_DISSECTOR_KEY_TIPC_ADDRS
:
598 diff
-= sizeof(flow
->addrs
.tipcaddrs
);
601 return (sizeof(*flow
) - diff
) / sizeof(u32
);
604 __be32
flow_get_u32_src(const struct flow_keys
*flow
)
606 switch (flow
->control
.addr_type
) {
607 case FLOW_DISSECTOR_KEY_IPV4_ADDRS
:
608 return flow
->addrs
.v4addrs
.src
;
609 case FLOW_DISSECTOR_KEY_IPV6_ADDRS
:
610 return (__force __be32
)ipv6_addr_hash(
611 &flow
->addrs
.v6addrs
.src
);
612 case FLOW_DISSECTOR_KEY_TIPC_ADDRS
:
613 return flow
->addrs
.tipcaddrs
.srcnode
;
618 EXPORT_SYMBOL(flow_get_u32_src
);
620 __be32
flow_get_u32_dst(const struct flow_keys
*flow
)
622 switch (flow
->control
.addr_type
) {
623 case FLOW_DISSECTOR_KEY_IPV4_ADDRS
:
624 return flow
->addrs
.v4addrs
.dst
;
625 case FLOW_DISSECTOR_KEY_IPV6_ADDRS
:
626 return (__force __be32
)ipv6_addr_hash(
627 &flow
->addrs
.v6addrs
.dst
);
632 EXPORT_SYMBOL(flow_get_u32_dst
);
634 static inline void __flow_hash_consistentify(struct flow_keys
*keys
)
638 switch (keys
->control
.addr_type
) {
639 case FLOW_DISSECTOR_KEY_IPV4_ADDRS
:
640 addr_diff
= (__force u32
)keys
->addrs
.v4addrs
.dst
-
641 (__force u32
)keys
->addrs
.v4addrs
.src
;
642 if ((addr_diff
< 0) ||
644 ((__force u16
)keys
->ports
.dst
<
645 (__force u16
)keys
->ports
.src
))) {
646 swap(keys
->addrs
.v4addrs
.src
, keys
->addrs
.v4addrs
.dst
);
647 swap(keys
->ports
.src
, keys
->ports
.dst
);
650 case FLOW_DISSECTOR_KEY_IPV6_ADDRS
:
651 addr_diff
= memcmp(&keys
->addrs
.v6addrs
.dst
,
652 &keys
->addrs
.v6addrs
.src
,
653 sizeof(keys
->addrs
.v6addrs
.dst
));
654 if ((addr_diff
< 0) ||
656 ((__force u16
)keys
->ports
.dst
<
657 (__force u16
)keys
->ports
.src
))) {
658 for (i
= 0; i
< 4; i
++)
659 swap(keys
->addrs
.v6addrs
.src
.s6_addr32
[i
],
660 keys
->addrs
.v6addrs
.dst
.s6_addr32
[i
]);
661 swap(keys
->ports
.src
, keys
->ports
.dst
);
667 static inline u32
__flow_hash_from_keys(struct flow_keys
*keys
, u32 keyval
)
671 __flow_hash_consistentify(keys
);
673 hash
= __flow_hash_words(flow_keys_hash_start(keys
),
674 flow_keys_hash_length(keys
), keyval
);
681 u32
flow_hash_from_keys(struct flow_keys
*keys
)
683 __flow_hash_secret_init();
684 return __flow_hash_from_keys(keys
, hashrnd
);
686 EXPORT_SYMBOL(flow_hash_from_keys
);
688 static inline u32
___skb_get_hash(const struct sk_buff
*skb
,
689 struct flow_keys
*keys
, u32 keyval
)
691 skb_flow_dissect_flow_keys(skb
, keys
,
692 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL
);
694 return __flow_hash_from_keys(keys
, keyval
);
697 struct _flow_keys_digest_data
{
706 void make_flow_keys_digest(struct flow_keys_digest
*digest
,
707 const struct flow_keys
*flow
)
709 struct _flow_keys_digest_data
*data
=
710 (struct _flow_keys_digest_data
*)digest
;
712 BUILD_BUG_ON(sizeof(*data
) > sizeof(*digest
));
714 memset(digest
, 0, sizeof(*digest
));
716 data
->n_proto
= flow
->basic
.n_proto
;
717 data
->ip_proto
= flow
->basic
.ip_proto
;
718 data
->ports
= flow
->ports
.ports
;
719 data
->src
= flow
->addrs
.v4addrs
.src
;
720 data
->dst
= flow
->addrs
.v4addrs
.dst
;
722 EXPORT_SYMBOL(make_flow_keys_digest
);
724 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly
;
726 u32
__skb_get_hash_symmetric(struct sk_buff
*skb
)
728 struct flow_keys keys
;
730 __flow_hash_secret_init();
732 memset(&keys
, 0, sizeof(keys
));
733 __skb_flow_dissect(skb
, &flow_keys_dissector_symmetric
, &keys
,
735 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL
);
737 return __flow_hash_from_keys(&keys
, hashrnd
);
739 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric
);
742 * __skb_get_hash: calculate a flow hash
743 * @skb: sk_buff to calculate flow hash from
745 * This function calculates a flow hash based on src/dst addresses
746 * and src/dst port numbers. Sets hash in skb to non-zero hash value
747 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
748 * if hash is a canonical 4-tuple hash over transport ports.
750 void __skb_get_hash(struct sk_buff
*skb
)
752 struct flow_keys keys
;
755 __flow_hash_secret_init();
757 hash
= ___skb_get_hash(skb
, &keys
, hashrnd
);
759 __skb_set_sw_hash(skb
, hash
, flow_keys_have_l4(&keys
));
761 EXPORT_SYMBOL(__skb_get_hash
);
763 __u32
skb_get_hash_perturb(const struct sk_buff
*skb
, u32 perturb
)
765 struct flow_keys keys
;
767 return ___skb_get_hash(skb
, &keys
, perturb
);
769 EXPORT_SYMBOL(skb_get_hash_perturb
);
771 __u32
__skb_get_hash_flowi6(struct sk_buff
*skb
, const struct flowi6
*fl6
)
773 struct flow_keys keys
;
775 memset(&keys
, 0, sizeof(keys
));
777 memcpy(&keys
.addrs
.v6addrs
.src
, &fl6
->saddr
,
778 sizeof(keys
.addrs
.v6addrs
.src
));
779 memcpy(&keys
.addrs
.v6addrs
.dst
, &fl6
->daddr
,
780 sizeof(keys
.addrs
.v6addrs
.dst
));
781 keys
.control
.addr_type
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
;
782 keys
.ports
.src
= fl6
->fl6_sport
;
783 keys
.ports
.dst
= fl6
->fl6_dport
;
784 keys
.keyid
.keyid
= fl6
->fl6_gre_key
;
785 keys
.tags
.flow_label
= (__force u32
)fl6
->flowlabel
;
786 keys
.basic
.ip_proto
= fl6
->flowi6_proto
;
788 __skb_set_sw_hash(skb
, flow_hash_from_keys(&keys
),
789 flow_keys_have_l4(&keys
));
793 EXPORT_SYMBOL(__skb_get_hash_flowi6
);
795 __u32
__skb_get_hash_flowi4(struct sk_buff
*skb
, const struct flowi4
*fl4
)
797 struct flow_keys keys
;
799 memset(&keys
, 0, sizeof(keys
));
801 keys
.addrs
.v4addrs
.src
= fl4
->saddr
;
802 keys
.addrs
.v4addrs
.dst
= fl4
->daddr
;
803 keys
.control
.addr_type
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
;
804 keys
.ports
.src
= fl4
->fl4_sport
;
805 keys
.ports
.dst
= fl4
->fl4_dport
;
806 keys
.keyid
.keyid
= fl4
->fl4_gre_key
;
807 keys
.basic
.ip_proto
= fl4
->flowi4_proto
;
809 __skb_set_sw_hash(skb
, flow_hash_from_keys(&keys
),
810 flow_keys_have_l4(&keys
));
814 EXPORT_SYMBOL(__skb_get_hash_flowi4
);
816 u32
__skb_get_poff(const struct sk_buff
*skb
, void *data
,
817 const struct flow_keys
*keys
, int hlen
)
819 u32 poff
= keys
->control
.thoff
;
821 /* skip L4 headers for fragments after the first */
822 if ((keys
->control
.flags
& FLOW_DIS_IS_FRAGMENT
) &&
823 !(keys
->control
.flags
& FLOW_DIS_FIRST_FRAG
))
826 switch (keys
->basic
.ip_proto
) {
828 /* access doff as u8 to avoid unaligned access */
832 doff
= __skb_header_pointer(skb
, poff
+ 12, sizeof(_doff
),
837 poff
+= max_t(u32
, sizeof(struct tcphdr
), (*doff
& 0xF0) >> 2);
841 case IPPROTO_UDPLITE
:
842 poff
+= sizeof(struct udphdr
);
844 /* For the rest, we do not really care about header
845 * extensions at this point for now.
848 poff
+= sizeof(struct icmphdr
);
851 poff
+= sizeof(struct icmp6hdr
);
854 poff
+= sizeof(struct igmphdr
);
857 poff
+= sizeof(struct dccp_hdr
);
860 poff
+= sizeof(struct sctphdr
);
868 * skb_get_poff - get the offset to the payload
869 * @skb: sk_buff to get the payload offset from
871 * The function will get the offset to the payload as far as it could
872 * be dissected. The main user is currently BPF, so that we can dynamically
873 * truncate packets without needing to push actual payload to the user
874 * space and can analyze headers only, instead.
876 u32
skb_get_poff(const struct sk_buff
*skb
)
878 struct flow_keys keys
;
880 if (!skb_flow_dissect_flow_keys(skb
, &keys
, 0))
883 return __skb_get_poff(skb
, skb
->data
, &keys
, skb_headlen(skb
));
886 __u32
__get_hash_from_flowi6(const struct flowi6
*fl6
, struct flow_keys
*keys
)
888 memset(keys
, 0, sizeof(*keys
));
890 memcpy(&keys
->addrs
.v6addrs
.src
, &fl6
->saddr
,
891 sizeof(keys
->addrs
.v6addrs
.src
));
892 memcpy(&keys
->addrs
.v6addrs
.dst
, &fl6
->daddr
,
893 sizeof(keys
->addrs
.v6addrs
.dst
));
894 keys
->control
.addr_type
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
;
895 keys
->ports
.src
= fl6
->fl6_sport
;
896 keys
->ports
.dst
= fl6
->fl6_dport
;
897 keys
->keyid
.keyid
= fl6
->fl6_gre_key
;
898 keys
->tags
.flow_label
= (__force u32
)fl6
->flowlabel
;
899 keys
->basic
.ip_proto
= fl6
->flowi6_proto
;
901 return flow_hash_from_keys(keys
);
903 EXPORT_SYMBOL(__get_hash_from_flowi6
);
905 __u32
__get_hash_from_flowi4(const struct flowi4
*fl4
, struct flow_keys
*keys
)
907 memset(keys
, 0, sizeof(*keys
));
909 keys
->addrs
.v4addrs
.src
= fl4
->saddr
;
910 keys
->addrs
.v4addrs
.dst
= fl4
->daddr
;
911 keys
->control
.addr_type
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
;
912 keys
->ports
.src
= fl4
->fl4_sport
;
913 keys
->ports
.dst
= fl4
->fl4_dport
;
914 keys
->keyid
.keyid
= fl4
->fl4_gre_key
;
915 keys
->basic
.ip_proto
= fl4
->flowi4_proto
;
917 return flow_hash_from_keys(keys
);
919 EXPORT_SYMBOL(__get_hash_from_flowi4
);
921 static const struct flow_dissector_key flow_keys_dissector_keys
[] = {
923 .key_id
= FLOW_DISSECTOR_KEY_CONTROL
,
924 .offset
= offsetof(struct flow_keys
, control
),
927 .key_id
= FLOW_DISSECTOR_KEY_BASIC
,
928 .offset
= offsetof(struct flow_keys
, basic
),
931 .key_id
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
,
932 .offset
= offsetof(struct flow_keys
, addrs
.v4addrs
),
935 .key_id
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
,
936 .offset
= offsetof(struct flow_keys
, addrs
.v6addrs
),
939 .key_id
= FLOW_DISSECTOR_KEY_TIPC_ADDRS
,
940 .offset
= offsetof(struct flow_keys
, addrs
.tipcaddrs
),
943 .key_id
= FLOW_DISSECTOR_KEY_PORTS
,
944 .offset
= offsetof(struct flow_keys
, ports
),
947 .key_id
= FLOW_DISSECTOR_KEY_VLAN
,
948 .offset
= offsetof(struct flow_keys
, vlan
),
951 .key_id
= FLOW_DISSECTOR_KEY_FLOW_LABEL
,
952 .offset
= offsetof(struct flow_keys
, tags
),
955 .key_id
= FLOW_DISSECTOR_KEY_GRE_KEYID
,
956 .offset
= offsetof(struct flow_keys
, keyid
),
960 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys
[] = {
962 .key_id
= FLOW_DISSECTOR_KEY_CONTROL
,
963 .offset
= offsetof(struct flow_keys
, control
),
966 .key_id
= FLOW_DISSECTOR_KEY_BASIC
,
967 .offset
= offsetof(struct flow_keys
, basic
),
970 .key_id
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
,
971 .offset
= offsetof(struct flow_keys
, addrs
.v4addrs
),
974 .key_id
= FLOW_DISSECTOR_KEY_IPV6_ADDRS
,
975 .offset
= offsetof(struct flow_keys
, addrs
.v6addrs
),
978 .key_id
= FLOW_DISSECTOR_KEY_PORTS
,
979 .offset
= offsetof(struct flow_keys
, ports
),
983 static const struct flow_dissector_key flow_keys_buf_dissector_keys
[] = {
985 .key_id
= FLOW_DISSECTOR_KEY_CONTROL
,
986 .offset
= offsetof(struct flow_keys
, control
),
989 .key_id
= FLOW_DISSECTOR_KEY_BASIC
,
990 .offset
= offsetof(struct flow_keys
, basic
),
994 struct flow_dissector flow_keys_dissector __read_mostly
;
995 EXPORT_SYMBOL(flow_keys_dissector
);
997 struct flow_dissector flow_keys_buf_dissector __read_mostly
;
999 static int __init
init_default_flow_dissectors(void)
1001 skb_flow_dissector_init(&flow_keys_dissector
,
1002 flow_keys_dissector_keys
,
1003 ARRAY_SIZE(flow_keys_dissector_keys
));
1004 skb_flow_dissector_init(&flow_keys_dissector_symmetric
,
1005 flow_keys_dissector_symmetric_keys
,
1006 ARRAY_SIZE(flow_keys_dissector_symmetric_keys
));
1007 skb_flow_dissector_init(&flow_keys_buf_dissector
,
1008 flow_keys_buf_dissector_keys
,
1009 ARRAY_SIZE(flow_keys_buf_dissector_keys
));
1013 late_initcall_sync(init_default_flow_dissectors
);