1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/kernel.h>
   3#include <linux/skbuff.h>
   4#include <linux/export.h>
   5#include <linux/ip.h>
   6#include <linux/ipv6.h>
   7#include <linux/if_vlan.h>
   8#include <net/dsa.h>
   9#include <net/dst_metadata.h>
  10#include <net/ip.h>
  11#include <net/ipv6.h>
  12#include <net/gre.h>
  13#include <net/pptp.h>
  14#include <net/tipc.h>
  15#include <linux/igmp.h>
  16#include <linux/icmp.h>
  17#include <linux/sctp.h>
  18#include <linux/dccp.h>
  19#include <linux/if_tunnel.h>
  20#include <linux/if_pppox.h>
  21#include <linux/ppp_defs.h>
  22#include <linux/stddef.h>
  23#include <linux/if_ether.h>
  24#include <linux/mpls.h>
  25#include <linux/tcp.h>
  26#include <linux/ptp_classify.h>
  27#include <net/flow_dissector.h>
  28#include <scsi/fc/fc_fcoe.h>
  29#include <uapi/linux/batadv_packet.h>
  30#include <linux/bpf.h>
  31#if IS_ENABLED(CONFIG_NF_CONNTRACK)
  32#include <net/netfilter/nf_conntrack_core.h>
  33#include <net/netfilter/nf_conntrack_labels.h>
  34#endif
  35#include <linux/bpf-netns.h>
  36
  37static void dissector_set_key(struct flow_dissector *flow_dissector,
  38			      enum flow_dissector_key_id key_id)
  39{
  40	flow_dissector->used_keys |= (1 << key_id);
  41}
  42
  43void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  44			     const struct flow_dissector_key *key,
  45			     unsigned int key_count)
  46{
  47	unsigned int i;
  48
  49	memset(flow_dissector, 0, sizeof(*flow_dissector));
  50
  51	for (i = 0; i < key_count; i++, key++) {
  52		/* User should make sure that every key target offset is within
  53		 * boundaries of unsigned short.
  54		 */
  55		BUG_ON(key->offset > USHRT_MAX);
  56		BUG_ON(dissector_uses_key(flow_dissector,
  57					  key->key_id));
  58
  59		dissector_set_key(flow_dissector, key->key_id);
  60		flow_dissector->offset[key->key_id] = key->offset;
  61	}
  62
  63	/* Ensure that the dissector always includes control and basic key.
  64	 * That way we are able to avoid handling lack of these in fast path.
  65	 */
  66	BUG_ON(!dissector_uses_key(flow_dissector,
  67				   FLOW_DISSECTOR_KEY_CONTROL));
  68	BUG_ON(!dissector_uses_key(flow_dissector,
  69				   FLOW_DISSECTOR_KEY_BASIC));
  70}
  71EXPORT_SYMBOL(skb_flow_dissector_init);
  72
  73#ifdef CONFIG_BPF_SYSCALL
  74int flow_dissector_bpf_prog_attach_check(struct net *net,
  75					 struct bpf_prog *prog)
  76{
  77	enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
  78
  79	if (net == &init_net) {
  80		/* BPF flow dissector in the root namespace overrides
  81		 * any per-net-namespace one. When attaching to root,
  82		 * make sure we don't have any BPF program attached
  83		 * to the non-root namespaces.
  84		 */
  85		struct net *ns;
  86
  87		for_each_net(ns) {
  88			if (ns == &init_net)
  89				continue;
  90			if (rcu_access_pointer(ns->bpf.run_array[type]))
  91				return -EEXIST;
  92		}
  93	} else {
  94		/* Make sure root flow dissector is not attached
  95		 * when attaching to the non-root namespace.
  96		 */
  97		if (rcu_access_pointer(init_net.bpf.run_array[type]))
  98			return -EEXIST;
  99	}
 100
 101	return 0;
 102}
 103#endif /* CONFIG_BPF_SYSCALL */
 104
 105/**
 106 * __skb_flow_get_ports - extract the upper layer ports and return them
 107 * @skb: sk_buff to extract the ports from
 108 * @thoff: transport header offset
 109 * @ip_proto: protocol for which to get port offset
 110 * @data: raw buffer pointer to the packet, if NULL use skb->data
 111 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 112 *
 113 * The function will try to retrieve the ports at offset thoff + poff where poff
 114 * is the protocol port offset returned from proto_ports_offset
 115 */
 116__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
 117			    const void *data, int hlen)
 118{
 119	int poff = proto_ports_offset(ip_proto);
 120
 121	if (!data) {
 122		data = skb->data;
 123		hlen = skb_headlen(skb);
 124	}
 125
 126	if (poff >= 0) {
 127		__be32 *ports, _ports;
 128
 129		ports = __skb_header_pointer(skb, thoff + poff,
 130					     sizeof(_ports), data, hlen, &_ports);
 131		if (ports)
 132			return *ports;
 133	}
 134
 135	return 0;
 136}
 137EXPORT_SYMBOL(__skb_flow_get_ports);
 138
 139static bool icmp_has_id(u8 type)
 140{
 141	switch (type) {
 142	case ICMP_ECHO:
 143	case ICMP_ECHOREPLY:
 144	case ICMP_TIMESTAMP:
 145	case ICMP_TIMESTAMPREPLY:
 146	case ICMPV6_ECHO_REQUEST:
 147	case ICMPV6_ECHO_REPLY:
 148		return true;
 149	}
 150
 151	return false;
 152}
 153
 154/**
 155 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
 156 * @skb: sk_buff to extract from
 157 * @key_icmp: struct flow_dissector_key_icmp to fill
 158 * @data: raw buffer pointer to the packet
 159 * @thoff: offset to extract at
 160 * @hlen: packet header length
 161 */
 162void skb_flow_get_icmp_tci(const struct sk_buff *skb,
 163			   struct flow_dissector_key_icmp *key_icmp,
 164			   const void *data, int thoff, int hlen)
 165{
 166	struct icmphdr *ih, _ih;
 167
 168	ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
 169	if (!ih)
 170		return;
 171
 172	key_icmp->type = ih->type;
 173	key_icmp->code = ih->code;
 174
 175	/* As we use 0 to signal that the Id field is not present,
 176	 * avoid confusion with packets without such field
 177	 */
 178	if (icmp_has_id(ih->type))
 179		key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1;
 180	else
 181		key_icmp->id = 0;
 182}
 183EXPORT_SYMBOL(skb_flow_get_icmp_tci);
 184
 185/* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
 186 * using skb_flow_get_icmp_tci().
 187 */
 188static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
 189				    struct flow_dissector *flow_dissector,
 190				    void *target_container, const void *data,
 191				    int thoff, int hlen)
 192{
 193	struct flow_dissector_key_icmp *key_icmp;
 194
 195	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
 196		return;
 197
 198	key_icmp = skb_flow_dissector_target(flow_dissector,
 199					     FLOW_DISSECTOR_KEY_ICMP,
 200					     target_container);
 201
 202	skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
 203}
 204
 205void skb_flow_dissect_meta(const struct sk_buff *skb,
 206			   struct flow_dissector *flow_dissector,
 207			   void *target_container)
 208{
 209	struct flow_dissector_key_meta *meta;
 210
 211	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
 212		return;
 213
 214	meta = skb_flow_dissector_target(flow_dissector,
 215					 FLOW_DISSECTOR_KEY_META,
 216					 target_container);
 217	meta->ingress_ifindex = skb->skb_iif;
 218}
 219EXPORT_SYMBOL(skb_flow_dissect_meta);
 220
 221static void
 222skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
 223				   struct flow_dissector *flow_dissector,
 224				   void *target_container)
 225{
 226	struct flow_dissector_key_control *ctrl;
 227
 228	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
 229		return;
 230
 231	ctrl = skb_flow_dissector_target(flow_dissector,
 232					 FLOW_DISSECTOR_KEY_ENC_CONTROL,
 233					 target_container);
 234	ctrl->addr_type = type;
 235}
 236
 237void
 238skb_flow_dissect_ct(const struct sk_buff *skb,
 239		    struct flow_dissector *flow_dissector,
 240		    void *target_container, u16 *ctinfo_map,
 241		    size_t mapsize, bool post_ct)
 
 242{
 243#if IS_ENABLED(CONFIG_NF_CONNTRACK)
 244	struct flow_dissector_key_ct *key;
 245	enum ip_conntrack_info ctinfo;
 246	struct nf_conn_labels *cl;
 247	struct nf_conn *ct;
 248
 249	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
 250		return;
 251
 252	ct = nf_ct_get(skb, &ctinfo);
 253	if (!ct && !post_ct)
 254		return;
 255
 256	key = skb_flow_dissector_target(flow_dissector,
 257					FLOW_DISSECTOR_KEY_CT,
 258					target_container);
 259
 260	if (!ct) {
 261		key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
 262				TCA_FLOWER_KEY_CT_FLAGS_INVALID;
 263		return;
 264	}
 265
 266	if (ctinfo < mapsize)
 267		key->ct_state = ctinfo_map[ctinfo];
 268#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
 269	key->ct_zone = ct->zone.id;
 270#endif
 271#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 272	key->ct_mark = ct->mark;
 273#endif
 274
 275	cl = nf_ct_labels_find(ct);
 276	if (cl)
 277		memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
 278#endif /* CONFIG_NF_CONNTRACK */
 279}
 280EXPORT_SYMBOL(skb_flow_dissect_ct);
 281
 282void
 283skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 284			     struct flow_dissector *flow_dissector,
 285			     void *target_container)
 286{
 287	struct ip_tunnel_info *info;
 288	struct ip_tunnel_key *key;
 289
 290	/* A quick check to see if there might be something to do. */
 291	if (!dissector_uses_key(flow_dissector,
 292				FLOW_DISSECTOR_KEY_ENC_KEYID) &&
 293	    !dissector_uses_key(flow_dissector,
 294				FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
 295	    !dissector_uses_key(flow_dissector,
 296				FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
 297	    !dissector_uses_key(flow_dissector,
 298				FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
 299	    !dissector_uses_key(flow_dissector,
 300				FLOW_DISSECTOR_KEY_ENC_PORTS) &&
 301	    !dissector_uses_key(flow_dissector,
 302				FLOW_DISSECTOR_KEY_ENC_IP) &&
 303	    !dissector_uses_key(flow_dissector,
 304				FLOW_DISSECTOR_KEY_ENC_OPTS))
 305		return;
 306
 307	info = skb_tunnel_info(skb);
 308	if (!info)
 309		return;
 310
 311	key = &info->key;
 312
 313	switch (ip_tunnel_info_af(info)) {
 314	case AF_INET:
 315		skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 316						   flow_dissector,
 317						   target_container);
 318		if (dissector_uses_key(flow_dissector,
 319				       FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 320			struct flow_dissector_key_ipv4_addrs *ipv4;
 321
 322			ipv4 = skb_flow_dissector_target(flow_dissector,
 323							 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 324							 target_container);
 325			ipv4->src = key->u.ipv4.src;
 326			ipv4->dst = key->u.ipv4.dst;
 327		}
 328		break;
 329	case AF_INET6:
 330		skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 331						   flow_dissector,
 332						   target_container);
 333		if (dissector_uses_key(flow_dissector,
 334				       FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 335			struct flow_dissector_key_ipv6_addrs *ipv6;
 336
 337			ipv6 = skb_flow_dissector_target(flow_dissector,
 338							 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
 339							 target_container);
 340			ipv6->src = key->u.ipv6.src;
 341			ipv6->dst = key->u.ipv6.dst;
 342		}
 343		break;
 344	}
 345
 346	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
 347		struct flow_dissector_key_keyid *keyid;
 348
 349		keyid = skb_flow_dissector_target(flow_dissector,
 350						  FLOW_DISSECTOR_KEY_ENC_KEYID,
 351						  target_container);
 352		keyid->keyid = tunnel_id_to_key32(key->tun_id);
 353	}
 354
 355	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 356		struct flow_dissector_key_ports *tp;
 357
 358		tp = skb_flow_dissector_target(flow_dissector,
 359					       FLOW_DISSECTOR_KEY_ENC_PORTS,
 360					       target_container);
 361		tp->src = key->tp_src;
 362		tp->dst = key->tp_dst;
 363	}
 364
 365	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
 366		struct flow_dissector_key_ip *ip;
 367
 368		ip = skb_flow_dissector_target(flow_dissector,
 369					       FLOW_DISSECTOR_KEY_ENC_IP,
 370					       target_container);
 371		ip->tos = key->tos;
 372		ip->ttl = key->ttl;
 373	}
 374
 375	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 376		struct flow_dissector_key_enc_opts *enc_opt;
 377
 378		enc_opt = skb_flow_dissector_target(flow_dissector,
 379						    FLOW_DISSECTOR_KEY_ENC_OPTS,
 380						    target_container);
 381
 382		if (info->options_len) {
 383			enc_opt->len = info->options_len;
 384			ip_tunnel_info_opts_get(enc_opt->data, info);
 385			enc_opt->dst_opt_type = info->key.tun_flags &
 386						TUNNEL_OPTIONS_PRESENT;
 387		}
 388	}
 389}
 390EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
 391
 392void skb_flow_dissect_hash(const struct sk_buff *skb,
 393			   struct flow_dissector *flow_dissector,
 394			   void *target_container)
 395{
 396	struct flow_dissector_key_hash *key;
 397
 398	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))
 399		return;
 400
 401	key = skb_flow_dissector_target(flow_dissector,
 402					FLOW_DISSECTOR_KEY_HASH,
 403					target_container);
 404
 405	key->hash = skb_get_hash_raw(skb);
 406}
 407EXPORT_SYMBOL(skb_flow_dissect_hash);
 408
 409static enum flow_dissect_ret
 410__skb_flow_dissect_mpls(const struct sk_buff *skb,
 411			struct flow_dissector *flow_dissector,
 412			void *target_container, const void *data, int nhoff,
 413			int hlen, int lse_index, bool *entropy_label)
 414{
 415	struct mpls_label *hdr, _hdr;
 416	u32 entry, label, bos;
 417
 418	if (!dissector_uses_key(flow_dissector,
 419				FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 420	    !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 421		return FLOW_DISSECT_RET_OUT_GOOD;
 422
 423	if (lse_index >= FLOW_DIS_MPLS_MAX)
 424		return FLOW_DISSECT_RET_OUT_GOOD;
 425
 426	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 427				   hlen, &_hdr);
 428	if (!hdr)
 429		return FLOW_DISSECT_RET_OUT_BAD;
 430
 431	entry = ntohl(hdr->entry);
 432	label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 433	bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
 434
 435	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 436		struct flow_dissector_key_mpls *key_mpls;
 437		struct flow_dissector_mpls_lse *lse;
 438
 439		key_mpls = skb_flow_dissector_target(flow_dissector,
 440						     FLOW_DISSECTOR_KEY_MPLS,
 441						     target_container);
 442		lse = &key_mpls->ls[lse_index];
 443
 444		lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
 445		lse->mpls_bos = bos;
 446		lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
 447		lse->mpls_label = label;
 448		dissector_set_mpls_lse(key_mpls, lse_index);
 449	}
 450
 451	if (*entropy_label &&
 452	    dissector_uses_key(flow_dissector,
 453			       FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
 454		struct flow_dissector_key_keyid *key_keyid;
 455
 456		key_keyid = skb_flow_dissector_target(flow_dissector,
 457						      FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 458						      target_container);
 459		key_keyid->keyid = cpu_to_be32(label);
 460	}
 461
 462	*entropy_label = label == MPLS_LABEL_ENTROPY;
 463
 464	return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN;
 465}
 466
 467static enum flow_dissect_ret
 468__skb_flow_dissect_arp(const struct sk_buff *skb,
 469		       struct flow_dissector *flow_dissector,
 470		       void *target_container, const void *data,
 471		       int nhoff, int hlen)
 472{
 473	struct flow_dissector_key_arp *key_arp;
 474	struct {
 475		unsigned char ar_sha[ETH_ALEN];
 476		unsigned char ar_sip[4];
 477		unsigned char ar_tha[ETH_ALEN];
 478		unsigned char ar_tip[4];
 479	} *arp_eth, _arp_eth;
 480	const struct arphdr *arp;
 481	struct arphdr _arp;
 482
 483	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 484		return FLOW_DISSECT_RET_OUT_GOOD;
 485
 486	arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 487				   hlen, &_arp);
 488	if (!arp)
 489		return FLOW_DISSECT_RET_OUT_BAD;
 490
 491	if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 492	    arp->ar_pro != htons(ETH_P_IP) ||
 493	    arp->ar_hln != ETH_ALEN ||
 494	    arp->ar_pln != 4 ||
 495	    (arp->ar_op != htons(ARPOP_REPLY) &&
 496	     arp->ar_op != htons(ARPOP_REQUEST)))
 497		return FLOW_DISSECT_RET_OUT_BAD;
 498
 499	arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 500				       sizeof(_arp_eth), data,
 501				       hlen, &_arp_eth);
 502	if (!arp_eth)
 503		return FLOW_DISSECT_RET_OUT_BAD;
 504
 505	key_arp = skb_flow_dissector_target(flow_dissector,
 506					    FLOW_DISSECTOR_KEY_ARP,
 507					    target_container);
 508
 509	memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 510	memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 511
 512	/* Only store the lower byte of the opcode;
 513	 * this covers ARPOP_REPLY and ARPOP_REQUEST.
 514	 */
 515	key_arp->op = ntohs(arp->ar_op) & 0xff;
 516
 517	ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 518	ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 519
 520	return FLOW_DISSECT_RET_OUT_GOOD;
 521}
 522
 523static enum flow_dissect_ret
 524__skb_flow_dissect_gre(const struct sk_buff *skb,
 525		       struct flow_dissector_key_control *key_control,
 526		       struct flow_dissector *flow_dissector,
 527		       void *target_container, const void *data,
 528		       __be16 *p_proto, int *p_nhoff, int *p_hlen,
 529		       unsigned int flags)
 530{
 531	struct flow_dissector_key_keyid *key_keyid;
 532	struct gre_base_hdr *hdr, _hdr;
 533	int offset = 0;
 534	u16 gre_ver;
 535
 536	hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 537				   data, *p_hlen, &_hdr);
 538	if (!hdr)
 539		return FLOW_DISSECT_RET_OUT_BAD;
 540
 541	/* Only look inside GRE without routing */
 542	if (hdr->flags & GRE_ROUTING)
 543		return FLOW_DISSECT_RET_OUT_GOOD;
 544
 545	/* Only look inside GRE for version 0 and 1 */
 546	gre_ver = ntohs(hdr->flags & GRE_VERSION);
 547	if (gre_ver > 1)
 548		return FLOW_DISSECT_RET_OUT_GOOD;
 549
 550	*p_proto = hdr->protocol;
 551	if (gre_ver) {
 552		/* Version1 must be PPTP, and check the flags */
 553		if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 554			return FLOW_DISSECT_RET_OUT_GOOD;
 555	}
 556
 557	offset += sizeof(struct gre_base_hdr);
 558
 559	if (hdr->flags & GRE_CSUM)
 560		offset += sizeof_field(struct gre_full_hdr, csum) +
 561			  sizeof_field(struct gre_full_hdr, reserved1);
 562
 563	if (hdr->flags & GRE_KEY) {
 564		const __be32 *keyid;
 565		__be32 _keyid;
 566
 567		keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 568					     sizeof(_keyid),
 569					     data, *p_hlen, &_keyid);
 570		if (!keyid)
 571			return FLOW_DISSECT_RET_OUT_BAD;
 572
 573		if (dissector_uses_key(flow_dissector,
 574				       FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 575			key_keyid = skb_flow_dissector_target(flow_dissector,
 576							      FLOW_DISSECTOR_KEY_GRE_KEYID,
 577							      target_container);
 578			if (gre_ver == 0)
 579				key_keyid->keyid = *keyid;
 580			else
 581				key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 582		}
 583		offset += sizeof_field(struct gre_full_hdr, key);
 584	}
 585
 586	if (hdr->flags & GRE_SEQ)
 587		offset += sizeof_field(struct pptp_gre_header, seq);
 588
 589	if (gre_ver == 0) {
 590		if (*p_proto == htons(ETH_P_TEB)) {
 591			const struct ethhdr *eth;
 592			struct ethhdr _eth;
 593
 594			eth = __skb_header_pointer(skb, *p_nhoff + offset,
 595						   sizeof(_eth),
 596						   data, *p_hlen, &_eth);
 597			if (!eth)
 598				return FLOW_DISSECT_RET_OUT_BAD;
 599			*p_proto = eth->h_proto;
 600			offset += sizeof(*eth);
 601
 602			/* Cap headers that we access via pointers at the
 603			 * end of the Ethernet header as our maximum alignment
 604			 * at that point is only 2 bytes.
 605			 */
 606			if (NET_IP_ALIGN)
 607				*p_hlen = *p_nhoff + offset;
 608		}
 609	} else { /* version 1, must be PPTP */
 610		u8 _ppp_hdr[PPP_HDRLEN];
 611		u8 *ppp_hdr;
 612
 613		if (hdr->flags & GRE_ACK)
 614			offset += sizeof_field(struct pptp_gre_header, ack);
 615
 616		ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 617					       sizeof(_ppp_hdr),
 618					       data, *p_hlen, _ppp_hdr);
 619		if (!ppp_hdr)
 620			return FLOW_DISSECT_RET_OUT_BAD;
 621
 622		switch (PPP_PROTOCOL(ppp_hdr)) {
 623		case PPP_IP:
 624			*p_proto = htons(ETH_P_IP);
 625			break;
 626		case PPP_IPV6:
 627			*p_proto = htons(ETH_P_IPV6);
 628			break;
 629		default:
 630			/* Could probably catch some more like MPLS */
 631			break;
 632		}
 633
 634		offset += PPP_HDRLEN;
 635	}
 636
 637	*p_nhoff += offset;
 638	key_control->flags |= FLOW_DIS_ENCAPSULATION;
 639	if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 640		return FLOW_DISSECT_RET_OUT_GOOD;
 641
 642	return FLOW_DISSECT_RET_PROTO_AGAIN;
 643}
 644
 645/**
 646 * __skb_flow_dissect_batadv() - dissect batman-adv header
 647 * @skb: sk_buff to with the batman-adv header
 648 * @key_control: flow dissectors control key
 649 * @data: raw buffer pointer to the packet, if NULL use skb->data
 650 * @p_proto: pointer used to update the protocol to process next
 651 * @p_nhoff: pointer used to update inner network header offset
 652 * @hlen: packet header length
 653 * @flags: any combination of FLOW_DISSECTOR_F_*
 654 *
 655 * ETH_P_BATMAN packets are tried to be dissected. Only
 656 * &struct batadv_unicast packets are actually processed because they contain an
 657 * inner ethernet header and are usually followed by actual network header. This
 658 * allows the flow dissector to continue processing the packet.
 659 *
 660 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
 661 *  FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
 662 *  otherwise FLOW_DISSECT_RET_OUT_BAD
 663 */
 664static enum flow_dissect_ret
 665__skb_flow_dissect_batadv(const struct sk_buff *skb,
 666			  struct flow_dissector_key_control *key_control,
 667			  const void *data, __be16 *p_proto, int *p_nhoff,
 668			  int hlen, unsigned int flags)
 669{
 670	struct {
 671		struct batadv_unicast_packet batadv_unicast;
 672		struct ethhdr eth;
 673	} *hdr, _hdr;
 674
 675	hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
 676				   &_hdr);
 677	if (!hdr)
 678		return FLOW_DISSECT_RET_OUT_BAD;
 679
 680	if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
 681		return FLOW_DISSECT_RET_OUT_BAD;
 682
 683	if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
 684		return FLOW_DISSECT_RET_OUT_BAD;
 685
 686	*p_proto = hdr->eth.h_proto;
 687	*p_nhoff += sizeof(*hdr);
 688
 689	key_control->flags |= FLOW_DIS_ENCAPSULATION;
 690	if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 691		return FLOW_DISSECT_RET_OUT_GOOD;
 692
 693	return FLOW_DISSECT_RET_PROTO_AGAIN;
 694}
 695
 696static void
 697__skb_flow_dissect_tcp(const struct sk_buff *skb,
 698		       struct flow_dissector *flow_dissector,
 699		       void *target_container, const void *data,
 700		       int thoff, int hlen)
 701{
 702	struct flow_dissector_key_tcp *key_tcp;
 703	struct tcphdr *th, _th;
 704
 705	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 706		return;
 707
 708	th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 709	if (!th)
 710		return;
 711
 712	if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 713		return;
 714
 715	key_tcp = skb_flow_dissector_target(flow_dissector,
 716					    FLOW_DISSECTOR_KEY_TCP,
 717					    target_container);
 718	key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 719}
 720
 721static void
 722__skb_flow_dissect_ports(const struct sk_buff *skb,
 723			 struct flow_dissector *flow_dissector,
 724			 void *target_container, const void *data,
 725			 int nhoff, u8 ip_proto, int hlen)
 726{
 727	enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
 728	struct flow_dissector_key_ports *key_ports;
 729
 730	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 731		dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
 732	else if (dissector_uses_key(flow_dissector,
 733				    FLOW_DISSECTOR_KEY_PORTS_RANGE))
 734		dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
 735
 736	if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
 737		return;
 738
 739	key_ports = skb_flow_dissector_target(flow_dissector,
 740					      dissector_ports,
 741					      target_container);
 742	key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 743						data, hlen);
 744}
 745
 746static void
 747__skb_flow_dissect_ipv4(const struct sk_buff *skb,
 748			struct flow_dissector *flow_dissector,
 749			void *target_container, const void *data,
 750			const struct iphdr *iph)
 751{
 752	struct flow_dissector_key_ip *key_ip;
 753
 754	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 755		return;
 756
 757	key_ip = skb_flow_dissector_target(flow_dissector,
 758					   FLOW_DISSECTOR_KEY_IP,
 759					   target_container);
 760	key_ip->tos = iph->tos;
 761	key_ip->ttl = iph->ttl;
 762}
 763
 764static void
 765__skb_flow_dissect_ipv6(const struct sk_buff *skb,
 766			struct flow_dissector *flow_dissector,
 767			void *target_container, const void *data,
 768			const struct ipv6hdr *iph)
 769{
 770	struct flow_dissector_key_ip *key_ip;
 771
 772	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 773		return;
 774
 775	key_ip = skb_flow_dissector_target(flow_dissector,
 776					   FLOW_DISSECTOR_KEY_IP,
 777					   target_container);
 778	key_ip->tos = ipv6_get_dsfield(iph);
 779	key_ip->ttl = iph->hop_limit;
 780}
 781
 782/* Maximum number of protocol headers that can be parsed in
 783 * __skb_flow_dissect
 784 */
 785#define MAX_FLOW_DISSECT_HDRS	15
 786
 787static bool skb_flow_dissect_allowed(int *num_hdrs)
 788{
 789	++*num_hdrs;
 790
 791	return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
 792}
 793
 794static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
 795				     struct flow_dissector *flow_dissector,
 796				     void *target_container)
 797{
 798	struct flow_dissector_key_ports *key_ports = NULL;
 799	struct flow_dissector_key_control *key_control;
 800	struct flow_dissector_key_basic *key_basic;
 801	struct flow_dissector_key_addrs *key_addrs;
 802	struct flow_dissector_key_tags *key_tags;
 803
 804	key_control = skb_flow_dissector_target(flow_dissector,
 805						FLOW_DISSECTOR_KEY_CONTROL,
 806						target_container);
 807	key_control->thoff = flow_keys->thoff;
 808	if (flow_keys->is_frag)
 809		key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 810	if (flow_keys->is_first_frag)
 811		key_control->flags |= FLOW_DIS_FIRST_FRAG;
 812	if (flow_keys->is_encap)
 813		key_control->flags |= FLOW_DIS_ENCAPSULATION;
 814
 815	key_basic = skb_flow_dissector_target(flow_dissector,
 816					      FLOW_DISSECTOR_KEY_BASIC,
 817					      target_container);
 818	key_basic->n_proto = flow_keys->n_proto;
 819	key_basic->ip_proto = flow_keys->ip_proto;
 820
 821	if (flow_keys->addr_proto == ETH_P_IP &&
 822	    dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 823		key_addrs = skb_flow_dissector_target(flow_dissector,
 824						      FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 825						      target_container);
 826		key_addrs->v4addrs.src = flow_keys->ipv4_src;
 827		key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
 828		key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 829	} else if (flow_keys->addr_proto == ETH_P_IPV6 &&
 830		   dissector_uses_key(flow_dissector,
 831				      FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 832		key_addrs = skb_flow_dissector_target(flow_dissector,
 833						      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 834						      target_container);
 835		memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
 836		       sizeof(key_addrs->v6addrs.src));
 837		memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
 838		       sizeof(key_addrs->v6addrs.dst));
 839		key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 840	}
 841
 842	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 843		key_ports = skb_flow_dissector_target(flow_dissector,
 844						      FLOW_DISSECTOR_KEY_PORTS,
 845						      target_container);
 846	else if (dissector_uses_key(flow_dissector,
 847				    FLOW_DISSECTOR_KEY_PORTS_RANGE))
 848		key_ports = skb_flow_dissector_target(flow_dissector,
 849						      FLOW_DISSECTOR_KEY_PORTS_RANGE,
 850						      target_container);
 851
 852	if (key_ports) {
 853		key_ports->src = flow_keys->sport;
 854		key_ports->dst = flow_keys->dport;
 855	}
 856
 857	if (dissector_uses_key(flow_dissector,
 858			       FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 859		key_tags = skb_flow_dissector_target(flow_dissector,
 860						     FLOW_DISSECTOR_KEY_FLOW_LABEL,
 861						     target_container);
 862		key_tags->flow_label = ntohl(flow_keys->flow_label);
 863	}
 864}
 865
 866bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 867		      __be16 proto, int nhoff, int hlen, unsigned int flags)
 868{
 869	struct bpf_flow_keys *flow_keys = ctx->flow_keys;
 870	u32 result;
 871
 872	/* Pass parameters to the BPF program */
 873	memset(flow_keys, 0, sizeof(*flow_keys));
 874	flow_keys->n_proto = proto;
 875	flow_keys->nhoff = nhoff;
 876	flow_keys->thoff = flow_keys->nhoff;
 877
 878	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
 879		     (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
 880	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
 881		     (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 882	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
 883		     (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
 884	flow_keys->flags = flags;
 885
 886	result = bpf_prog_run_pin_on_cpu(prog, ctx);
 887
 888	flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
 889	flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
 890				   flow_keys->nhoff, hlen);
 891
 892	return result == BPF_OK;
 893}
 894
 895/**
 896 * __skb_flow_dissect - extract the flow_keys struct and return it
 897 * @net: associated network namespace, derived from @skb if NULL
 898 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 899 * @flow_dissector: list of keys to dissect
 900 * @target_container: target structure to put dissected values into
 901 * @data: raw buffer pointer to the packet, if NULL use skb->data
 902 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 903 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 904 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 905 * @flags: flags that control the dissection process, e.g.
 906 *         FLOW_DISSECTOR_F_STOP_AT_ENCAP.
 907 *
 908 * The function will try to retrieve individual keys into target specified
 909 * by flow_dissector from either the skbuff or a raw buffer specified by the
 910 * rest parameters.
 911 *
 912 * Caller must take care of zeroing target container memory.
 913 */
 914bool __skb_flow_dissect(const struct net *net,
 915			const struct sk_buff *skb,
 916			struct flow_dissector *flow_dissector,
 917			void *target_container, const void *data,
 918			__be16 proto, int nhoff, int hlen, unsigned int flags)
 
 919{
 920	struct flow_dissector_key_control *key_control;
 921	struct flow_dissector_key_basic *key_basic;
 922	struct flow_dissector_key_addrs *key_addrs;
 923	struct flow_dissector_key_tags *key_tags;
 924	struct flow_dissector_key_vlan *key_vlan;
 925	enum flow_dissect_ret fdret;
 926	enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
 927	bool mpls_el = false;
 928	int mpls_lse = 0;
 929	int num_hdrs = 0;
 930	u8 ip_proto = 0;
 931	bool ret;
 932
 933	if (!data) {
 934		data = skb->data;
 935		proto = skb_vlan_tag_present(skb) ?
 936			 skb->vlan_proto : skb->protocol;
 937		nhoff = skb_network_offset(skb);
 938		hlen = skb_headlen(skb);
 939#if IS_ENABLED(CONFIG_NET_DSA)
 940		if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
 941			     proto == htons(ETH_P_XDSA))) {
 942			const struct dsa_device_ops *ops;
 943			int offset = 0;
 944
 945			ops = skb->dev->dsa_ptr->tag_ops;
 946			/* Only DSA header taggers break flow dissection */
 947			if (ops->needed_headroom) {
 948				if (ops->flow_dissect)
 949					ops->flow_dissect(skb, &proto, &offset);
 950				else
 951					dsa_tag_generic_flow_dissect(skb,
 952								     &proto,
 953								     &offset);
 954				hlen -= offset;
 955				nhoff += offset;
 956			}
 957		}
 958#endif
 959	}
 960
 961	/* It is ensured by skb_flow_dissector_init() that control key will
 962	 * be always present.
 963	 */
 964	key_control = skb_flow_dissector_target(flow_dissector,
 965						FLOW_DISSECTOR_KEY_CONTROL,
 966						target_container);
 967
 968	/* It is ensured by skb_flow_dissector_init() that basic key will
 969	 * be always present.
 970	 */
 971	key_basic = skb_flow_dissector_target(flow_dissector,
 972					      FLOW_DISSECTOR_KEY_BASIC,
 973					      target_container);
 974
 975	if (skb) {
 976		if (!net) {
 977			if (skb->dev)
 978				net = dev_net(skb->dev);
 979			else if (skb->sk)
 980				net = sock_net(skb->sk);
 981		}
 982	}
 983
 984	WARN_ON_ONCE(!net);
 985	if (net) {
 986		enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
 987		struct bpf_prog_array *run_array;
 988
 989		rcu_read_lock();
 990		run_array = rcu_dereference(init_net.bpf.run_array[type]);
 991		if (!run_array)
 992			run_array = rcu_dereference(net->bpf.run_array[type]);
 993
 994		if (run_array) {
 995			struct bpf_flow_keys flow_keys;
 996			struct bpf_flow_dissector ctx = {
 997				.flow_keys = &flow_keys,
 998				.data = data,
 999				.data_end = data + hlen,
1000			};
1001			__be16 n_proto = proto;
1002			struct bpf_prog *prog;
1003
1004			if (skb) {
1005				ctx.skb = skb;
1006				/* we can't use 'proto' in the skb case
1007				 * because it might be set to skb->vlan_proto
1008				 * which has been pulled from the data
1009				 */
1010				n_proto = skb->protocol;
1011			}
1012
1013			prog = READ_ONCE(run_array->items[0].prog);
1014			ret = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1015					       hlen, flags);
1016			__skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1017						 target_container);
1018			rcu_read_unlock();
1019			return ret;
1020		}
1021		rcu_read_unlock();
1022	}
1023
1024	if (dissector_uses_key(flow_dissector,
1025			       FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1026		struct ethhdr *eth = eth_hdr(skb);
1027		struct flow_dissector_key_eth_addrs *key_eth_addrs;
1028
1029		key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1030							  FLOW_DISSECTOR_KEY_ETH_ADDRS,
1031							  target_container);
1032		memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
1033	}
1034
1035proto_again:
1036	fdret = FLOW_DISSECT_RET_CONTINUE;
1037
1038	switch (proto) {
1039	case htons(ETH_P_IP): {
1040		const struct iphdr *iph;
1041		struct iphdr _iph;
1042
1043		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1044		if (!iph || iph->ihl < 5) {
1045			fdret = FLOW_DISSECT_RET_OUT_BAD;
1046			break;
1047		}
1048
1049		nhoff += iph->ihl * 4;
1050
1051		ip_proto = iph->protocol;
1052
1053		if (dissector_uses_key(flow_dissector,
1054				       FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1055			key_addrs = skb_flow_dissector_target(flow_dissector,
1056							      FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1057							      target_container);
1058
1059			memcpy(&key_addrs->v4addrs.src, &iph->saddr,
1060			       sizeof(key_addrs->v4addrs.src));
1061			memcpy(&key_addrs->v4addrs.dst, &iph->daddr,
1062			       sizeof(key_addrs->v4addrs.dst));
1063			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1064		}
1065
1066		__skb_flow_dissect_ipv4(skb, flow_dissector,
1067					target_container, data, iph);
1068
1069		if (ip_is_fragment(iph)) {
1070			key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1071
1072			if (iph->frag_off & htons(IP_OFFSET)) {
1073				fdret = FLOW_DISSECT_RET_OUT_GOOD;
1074				break;
1075			} else {
1076				key_control->flags |= FLOW_DIS_FIRST_FRAG;
1077				if (!(flags &
1078				      FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1079					fdret = FLOW_DISSECT_RET_OUT_GOOD;
1080					break;
1081				}
1082			}
1083		}
1084
 
 
 
1085		break;
1086	}
1087	case htons(ETH_P_IPV6): {
1088		const struct ipv6hdr *iph;
1089		struct ipv6hdr _iph;
1090
1091		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1092		if (!iph) {
1093			fdret = FLOW_DISSECT_RET_OUT_BAD;
1094			break;
1095		}
1096
1097		ip_proto = iph->nexthdr;
1098		nhoff += sizeof(struct ipv6hdr);
1099
1100		if (dissector_uses_key(flow_dissector,
1101				       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1102			key_addrs = skb_flow_dissector_target(flow_dissector,
1103							      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1104							      target_container);
1105
1106			memcpy(&key_addrs->v6addrs.src, &iph->saddr,
1107			       sizeof(key_addrs->v6addrs.src));
1108			memcpy(&key_addrs->v6addrs.dst, &iph->daddr,
1109			       sizeof(key_addrs->v6addrs.dst));
1110			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1111		}
1112
1113		if ((dissector_uses_key(flow_dissector,
1114					FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1115		     (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1116		    ip6_flowlabel(iph)) {
1117			__be32 flow_label = ip6_flowlabel(iph);
1118
1119			if (dissector_uses_key(flow_dissector,
1120					       FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1121				key_tags = skb_flow_dissector_target(flow_dissector,
1122								     FLOW_DISSECTOR_KEY_FLOW_LABEL,
1123								     target_container);
1124				key_tags->flow_label = ntohl(flow_label);
1125			}
1126			if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1127				fdret = FLOW_DISSECT_RET_OUT_GOOD;
1128				break;
1129			}
1130		}
1131
1132		__skb_flow_dissect_ipv6(skb, flow_dissector,
1133					target_container, data, iph);
1134
1135		break;
1136	}
1137	case htons(ETH_P_8021AD):
1138	case htons(ETH_P_8021Q): {
1139		const struct vlan_hdr *vlan = NULL;
1140		struct vlan_hdr _vlan;
1141		__be16 saved_vlan_tpid = proto;
1142
1143		if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1144		    skb && skb_vlan_tag_present(skb)) {
1145			proto = skb->protocol;
1146		} else {
1147			vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1148						    data, hlen, &_vlan);
1149			if (!vlan) {
1150				fdret = FLOW_DISSECT_RET_OUT_BAD;
1151				break;
1152			}
1153
1154			proto = vlan->h_vlan_encapsulated_proto;
1155			nhoff += sizeof(*vlan);
1156		}
1157
1158		if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1159			dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1160		} else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1161			dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1162		} else {
1163			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1164			break;
1165		}
1166
1167		if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1168			key_vlan = skb_flow_dissector_target(flow_dissector,
1169							     dissector_vlan,
1170							     target_container);
1171
1172			if (!vlan) {
1173				key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1174				key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
1175			} else {
1176				key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1177					VLAN_VID_MASK;
1178				key_vlan->vlan_priority =
1179					(ntohs(vlan->h_vlan_TCI) &
1180					 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1181			}
1182			key_vlan->vlan_tpid = saved_vlan_tpid;
1183		}
1184
1185		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1186		break;
1187	}
1188	case htons(ETH_P_PPP_SES): {
1189		struct {
1190			struct pppoe_hdr hdr;
1191			__be16 proto;
1192		} *hdr, _hdr;
1193		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1194		if (!hdr) {
1195			fdret = FLOW_DISSECT_RET_OUT_BAD;
1196			break;
1197		}
1198
1199		proto = hdr->proto;
1200		nhoff += PPPOE_SES_HLEN;
1201		switch (proto) {
1202		case htons(PPP_IP):
1203			proto = htons(ETH_P_IP);
1204			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1205			break;
1206		case htons(PPP_IPV6):
1207			proto = htons(ETH_P_IPV6);
1208			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1209			break;
1210		default:
1211			fdret = FLOW_DISSECT_RET_OUT_BAD;
1212			break;
1213		}
1214		break;
1215	}
1216	case htons(ETH_P_TIPC): {
1217		struct tipc_basic_hdr *hdr, _hdr;
1218
1219		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1220					   data, hlen, &_hdr);
1221		if (!hdr) {
1222			fdret = FLOW_DISSECT_RET_OUT_BAD;
1223			break;
1224		}
1225
1226		if (dissector_uses_key(flow_dissector,
1227				       FLOW_DISSECTOR_KEY_TIPC)) {
1228			key_addrs = skb_flow_dissector_target(flow_dissector,
1229							      FLOW_DISSECTOR_KEY_TIPC,
1230							      target_container);
1231			key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1232			key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1233		}
1234		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1235		break;
1236	}
1237
1238	case htons(ETH_P_MPLS_UC):
1239	case htons(ETH_P_MPLS_MC):
1240		fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1241						target_container, data,
1242						nhoff, hlen, mpls_lse,
1243						&mpls_el);
1244		nhoff += sizeof(struct mpls_label);
1245		mpls_lse++;
1246		break;
1247	case htons(ETH_P_FCOE):
1248		if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1249			fdret = FLOW_DISSECT_RET_OUT_BAD;
1250			break;
1251		}
1252
1253		nhoff += FCOE_HEADER_LEN;
1254		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1255		break;
1256
1257	case htons(ETH_P_ARP):
1258	case htons(ETH_P_RARP):
1259		fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1260					       target_container, data,
1261					       nhoff, hlen);
1262		break;
1263
1264	case htons(ETH_P_BATMAN):
1265		fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1266						  &proto, &nhoff, hlen, flags);
1267		break;
1268
1269	case htons(ETH_P_1588): {
1270		struct ptp_header *hdr, _hdr;
1271
1272		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1273					   hlen, &_hdr);
1274		if (!hdr) {
1275			fdret = FLOW_DISSECT_RET_OUT_BAD;
1276			break;
1277		}
1278
1279		nhoff += ntohs(hdr->message_length);
1280		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1281		break;
1282	}
1283
1284	default:
1285		fdret = FLOW_DISSECT_RET_OUT_BAD;
1286		break;
1287	}
1288
1289	/* Process result of proto processing */
1290	switch (fdret) {
1291	case FLOW_DISSECT_RET_OUT_GOOD:
1292		goto out_good;
1293	case FLOW_DISSECT_RET_PROTO_AGAIN:
1294		if (skb_flow_dissect_allowed(&num_hdrs))
1295			goto proto_again;
1296		goto out_good;
1297	case FLOW_DISSECT_RET_CONTINUE:
1298	case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1299		break;
1300	case FLOW_DISSECT_RET_OUT_BAD:
1301	default:
1302		goto out_bad;
1303	}
1304
1305ip_proto_again:
1306	fdret = FLOW_DISSECT_RET_CONTINUE;
1307
1308	switch (ip_proto) {
1309	case IPPROTO_GRE:
1310		fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1311					       target_container, data,
1312					       &proto, &nhoff, &hlen, flags);
1313		break;
1314
1315	case NEXTHDR_HOP:
1316	case NEXTHDR_ROUTING:
1317	case NEXTHDR_DEST: {
1318		u8 _opthdr[2], *opthdr;
1319
1320		if (proto != htons(ETH_P_IPV6))
1321			break;
1322
1323		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1324					      data, hlen, &_opthdr);
1325		if (!opthdr) {
1326			fdret = FLOW_DISSECT_RET_OUT_BAD;
1327			break;
1328		}
1329
1330		ip_proto = opthdr[0];
1331		nhoff += (opthdr[1] + 1) << 3;
1332
1333		fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1334		break;
1335	}
1336	case NEXTHDR_FRAGMENT: {
1337		struct frag_hdr _fh, *fh;
1338
1339		if (proto != htons(ETH_P_IPV6))
1340			break;
1341
1342		fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1343					  data, hlen, &_fh);
1344
1345		if (!fh) {
1346			fdret = FLOW_DISSECT_RET_OUT_BAD;
1347			break;
1348		}
1349
1350		key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1351
1352		nhoff += sizeof(_fh);
1353		ip_proto = fh->nexthdr;
1354
1355		if (!(fh->frag_off & htons(IP6_OFFSET))) {
1356			key_control->flags |= FLOW_DIS_FIRST_FRAG;
1357			if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1358				fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1359				break;
1360			}
1361		}
1362
1363		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1364		break;
1365	}
1366	case IPPROTO_IPIP:
1367		proto = htons(ETH_P_IP);
1368
1369		key_control->flags |= FLOW_DIS_ENCAPSULATION;
1370		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1371			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1372			break;
1373		}
1374
1375		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1376		break;
1377
1378	case IPPROTO_IPV6:
1379		proto = htons(ETH_P_IPV6);
1380
1381		key_control->flags |= FLOW_DIS_ENCAPSULATION;
1382		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1383			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1384			break;
1385		}
1386
1387		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1388		break;
1389
1390
1391	case IPPROTO_MPLS:
1392		proto = htons(ETH_P_MPLS_UC);
1393		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1394		break;
1395
1396	case IPPROTO_TCP:
1397		__skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1398				       data, nhoff, hlen);
1399		break;
1400
1401	case IPPROTO_ICMP:
1402	case IPPROTO_ICMPV6:
1403		__skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1404					data, nhoff, hlen);
1405		break;
1406
1407	default:
1408		break;
1409	}
1410
1411	if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1412		__skb_flow_dissect_ports(skb, flow_dissector, target_container,
1413					 data, nhoff, ip_proto, hlen);
1414
1415	/* Process result of IP proto processing */
1416	switch (fdret) {
1417	case FLOW_DISSECT_RET_PROTO_AGAIN:
1418		if (skb_flow_dissect_allowed(&num_hdrs))
1419			goto proto_again;
1420		break;
1421	case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1422		if (skb_flow_dissect_allowed(&num_hdrs))
1423			goto ip_proto_again;
1424		break;
1425	case FLOW_DISSECT_RET_OUT_GOOD:
1426	case FLOW_DISSECT_RET_CONTINUE:
1427		break;
1428	case FLOW_DISSECT_RET_OUT_BAD:
1429	default:
1430		goto out_bad;
1431	}
1432
1433out_good:
1434	ret = true;
1435
1436out:
1437	key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1438	key_basic->n_proto = proto;
1439	key_basic->ip_proto = ip_proto;
1440
1441	return ret;
1442
1443out_bad:
1444	ret = false;
1445	goto out;
1446}
1447EXPORT_SYMBOL(__skb_flow_dissect);
1448
1449static siphash_key_t hashrnd __read_mostly;
1450static __always_inline void __flow_hash_secret_init(void)
1451{
1452	net_get_random_once(&hashrnd, sizeof(hashrnd));
1453}
1454
1455static const void *flow_keys_hash_start(const struct flow_keys *flow)
1456{
1457	BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1458	return &flow->FLOW_KEYS_HASH_START_FIELD;
1459}
1460
1461static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1462{
1463	size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1464
1465	BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
1466
1467	switch (flow->control.addr_type) {
1468	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1469		diff -= sizeof(flow->addrs.v4addrs);
1470		break;
1471	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1472		diff -= sizeof(flow->addrs.v6addrs);
1473		break;
1474	case FLOW_DISSECTOR_KEY_TIPC:
1475		diff -= sizeof(flow->addrs.tipckey);
1476		break;
1477	}
1478	return sizeof(*flow) - diff;
1479}
1480
1481__be32 flow_get_u32_src(const struct flow_keys *flow)
1482{
1483	switch (flow->control.addr_type) {
1484	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1485		return flow->addrs.v4addrs.src;
1486	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1487		return (__force __be32)ipv6_addr_hash(
1488			&flow->addrs.v6addrs.src);
1489	case FLOW_DISSECTOR_KEY_TIPC:
1490		return flow->addrs.tipckey.key;
1491	default:
1492		return 0;
1493	}
1494}
1495EXPORT_SYMBOL(flow_get_u32_src);
1496
1497__be32 flow_get_u32_dst(const struct flow_keys *flow)
1498{
1499	switch (flow->control.addr_type) {
1500	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1501		return flow->addrs.v4addrs.dst;
1502	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1503		return (__force __be32)ipv6_addr_hash(
1504			&flow->addrs.v6addrs.dst);
1505	default:
1506		return 0;
1507	}
1508}
1509EXPORT_SYMBOL(flow_get_u32_dst);
1510
1511/* Sort the source and destination IP and the ports,
1512 * to have consistent hash within the two directions
1513 */
1514static inline void __flow_hash_consistentify(struct flow_keys *keys)
1515{
1516	int addr_diff, i;
1517
1518	switch (keys->control.addr_type) {
1519	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1520		addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1521			    (__force u32)keys->addrs.v4addrs.src;
1522		if (addr_diff < 0)
 
 
 
1523			swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1524
1525		if ((__force u16)keys->ports.dst <
1526		    (__force u16)keys->ports.src) {
1527			swap(keys->ports.src, keys->ports.dst);
1528		}
1529		break;
1530	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1531		addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1532				   &keys->addrs.v6addrs.src,
1533				   sizeof(keys->addrs.v6addrs.dst));
1534		if (addr_diff < 0) {
 
 
 
1535			for (i = 0; i < 4; i++)
1536				swap(keys->addrs.v6addrs.src.s6_addr32[i],
1537				     keys->addrs.v6addrs.dst.s6_addr32[i]);
1538		}
1539		if ((__force u16)keys->ports.dst <
1540		    (__force u16)keys->ports.src) {
1541			swap(keys->ports.src, keys->ports.dst);
1542		}
1543		break;
1544	}
1545}
1546
1547static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1548					const siphash_key_t *keyval)
1549{
1550	u32 hash;
1551
1552	__flow_hash_consistentify(keys);
1553
1554	hash = siphash(flow_keys_hash_start(keys),
1555		       flow_keys_hash_length(keys), keyval);
1556	if (!hash)
1557		hash = 1;
1558
1559	return hash;
1560}
1561
1562u32 flow_hash_from_keys(struct flow_keys *keys)
1563{
1564	__flow_hash_secret_init();
1565	return __flow_hash_from_keys(keys, &hashrnd);
1566}
1567EXPORT_SYMBOL(flow_hash_from_keys);
1568
1569static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1570				  struct flow_keys *keys,
1571				  const siphash_key_t *keyval)
1572{
1573	skb_flow_dissect_flow_keys(skb, keys,
1574				   FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1575
1576	return __flow_hash_from_keys(keys, keyval);
1577}
1578
1579struct _flow_keys_digest_data {
1580	__be16	n_proto;
1581	u8	ip_proto;
1582	u8	padding;
1583	__be32	ports;
1584	__be32	src;
1585	__be32	dst;
1586};
1587
1588void make_flow_keys_digest(struct flow_keys_digest *digest,
1589			   const struct flow_keys *flow)
1590{
1591	struct _flow_keys_digest_data *data =
1592	    (struct _flow_keys_digest_data *)digest;
1593
1594	BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1595
1596	memset(digest, 0, sizeof(*digest));
1597
1598	data->n_proto = flow->basic.n_proto;
1599	data->ip_proto = flow->basic.ip_proto;
1600	data->ports = flow->ports.ports;
1601	data->src = flow->addrs.v4addrs.src;
1602	data->dst = flow->addrs.v4addrs.dst;
1603}
1604EXPORT_SYMBOL(make_flow_keys_digest);
1605
1606static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1607
1608u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1609{
1610	struct flow_keys keys;
1611
1612	__flow_hash_secret_init();
1613
1614	memset(&keys, 0, sizeof(keys));
1615	__skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1616			   &keys, NULL, 0, 0, 0,
1617			   FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1618
1619	return __flow_hash_from_keys(&keys, &hashrnd);
1620}
1621EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1622
1623/**
1624 * __skb_get_hash: calculate a flow hash
1625 * @skb: sk_buff to calculate flow hash from
1626 *
1627 * This function calculates a flow hash based on src/dst addresses
1628 * and src/dst port numbers.  Sets hash in skb to non-zero hash value
1629 * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
1630 * if hash is a canonical 4-tuple hash over transport ports.
1631 */
1632void __skb_get_hash(struct sk_buff *skb)
1633{
1634	struct flow_keys keys;
1635	u32 hash;
1636
1637	__flow_hash_secret_init();
1638
1639	hash = ___skb_get_hash(skb, &keys, &hashrnd);
1640
1641	__skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1642}
1643EXPORT_SYMBOL(__skb_get_hash);
1644
1645__u32 skb_get_hash_perturb(const struct sk_buff *skb,
1646			   const siphash_key_t *perturb)
1647{
1648	struct flow_keys keys;
1649
1650	return ___skb_get_hash(skb, &keys, perturb);
1651}
1652EXPORT_SYMBOL(skb_get_hash_perturb);
1653
1654u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
1655		   const struct flow_keys_basic *keys, int hlen)
1656{
1657	u32 poff = keys->control.thoff;
1658
1659	/* skip L4 headers for fragments after the first */
1660	if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1661	    !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1662		return poff;
1663
1664	switch (keys->basic.ip_proto) {
1665	case IPPROTO_TCP: {
1666		/* access doff as u8 to avoid unaligned access */
1667		const u8 *doff;
1668		u8 _doff;
1669
1670		doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1671					    data, hlen, &_doff);
1672		if (!doff)
1673			return poff;
1674
1675		poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1676		break;
1677	}
1678	case IPPROTO_UDP:
1679	case IPPROTO_UDPLITE:
1680		poff += sizeof(struct udphdr);
1681		break;
1682	/* For the rest, we do not really care about header
1683	 * extensions at this point for now.
1684	 */
1685	case IPPROTO_ICMP:
1686		poff += sizeof(struct icmphdr);
1687		break;
1688	case IPPROTO_ICMPV6:
1689		poff += sizeof(struct icmp6hdr);
1690		break;
1691	case IPPROTO_IGMP:
1692		poff += sizeof(struct igmphdr);
1693		break;
1694	case IPPROTO_DCCP:
1695		poff += sizeof(struct dccp_hdr);
1696		break;
1697	case IPPROTO_SCTP:
1698		poff += sizeof(struct sctphdr);
1699		break;
1700	}
1701
1702	return poff;
1703}
1704
1705/**
1706 * skb_get_poff - get the offset to the payload
1707 * @skb: sk_buff to get the payload offset from
1708 *
1709 * The function will get the offset to the payload as far as it could
1710 * be dissected.  The main user is currently BPF, so that we can dynamically
1711 * truncate packets without needing to push actual payload to the user
1712 * space and can analyze headers only, instead.
1713 */
1714u32 skb_get_poff(const struct sk_buff *skb)
1715{
1716	struct flow_keys_basic keys;
1717
1718	if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1719					      NULL, 0, 0, 0, 0))
1720		return 0;
1721
1722	return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1723}
1724
1725__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1726{
1727	memset(keys, 0, sizeof(*keys));
1728
1729	memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1730	    sizeof(keys->addrs.v6addrs.src));
1731	memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1732	    sizeof(keys->addrs.v6addrs.dst));
1733	keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1734	keys->ports.src = fl6->fl6_sport;
1735	keys->ports.dst = fl6->fl6_dport;
1736	keys->keyid.keyid = fl6->fl6_gre_key;
1737	keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1738	keys->basic.ip_proto = fl6->flowi6_proto;
1739
1740	return flow_hash_from_keys(keys);
1741}
1742EXPORT_SYMBOL(__get_hash_from_flowi6);
1743
1744static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1745	{
1746		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
1747		.offset = offsetof(struct flow_keys, control),
1748	},
1749	{
1750		.key_id = FLOW_DISSECTOR_KEY_BASIC,
1751		.offset = offsetof(struct flow_keys, basic),
1752	},
1753	{
1754		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1755		.offset = offsetof(struct flow_keys, addrs.v4addrs),
1756	},
1757	{
1758		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1759		.offset = offsetof(struct flow_keys, addrs.v6addrs),
1760	},
1761	{
1762		.key_id = FLOW_DISSECTOR_KEY_TIPC,
1763		.offset = offsetof(struct flow_keys, addrs.tipckey),
1764	},
1765	{
1766		.key_id = FLOW_DISSECTOR_KEY_PORTS,
1767		.offset = offsetof(struct flow_keys, ports),
1768	},
1769	{
1770		.key_id = FLOW_DISSECTOR_KEY_VLAN,
1771		.offset = offsetof(struct flow_keys, vlan),
1772	},
1773	{
1774		.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1775		.offset = offsetof(struct flow_keys, tags),
1776	},
1777	{
1778		.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1779		.offset = offsetof(struct flow_keys, keyid),
1780	},
1781};
1782
1783static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1784	{
1785		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
1786		.offset = offsetof(struct flow_keys, control),
1787	},
1788	{
1789		.key_id = FLOW_DISSECTOR_KEY_BASIC,
1790		.offset = offsetof(struct flow_keys, basic),
1791	},
1792	{
1793		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1794		.offset = offsetof(struct flow_keys, addrs.v4addrs),
1795	},
1796	{
1797		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1798		.offset = offsetof(struct flow_keys, addrs.v6addrs),
1799	},
1800	{
1801		.key_id = FLOW_DISSECTOR_KEY_PORTS,
1802		.offset = offsetof(struct flow_keys, ports),
1803	},
1804};
1805
1806static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
1807	{
1808		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
1809		.offset = offsetof(struct flow_keys, control),
1810	},
1811	{
1812		.key_id = FLOW_DISSECTOR_KEY_BASIC,
1813		.offset = offsetof(struct flow_keys, basic),
1814	},
1815};
1816
1817struct flow_dissector flow_keys_dissector __read_mostly;
1818EXPORT_SYMBOL(flow_keys_dissector);
1819
1820struct flow_dissector flow_keys_basic_dissector __read_mostly;
1821EXPORT_SYMBOL(flow_keys_basic_dissector);
1822
1823static int __init init_default_flow_dissectors(void)
1824{
1825	skb_flow_dissector_init(&flow_keys_dissector,
1826				flow_keys_dissector_keys,
1827				ARRAY_SIZE(flow_keys_dissector_keys));
1828	skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1829				flow_keys_dissector_symmetric_keys,
1830				ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1831	skb_flow_dissector_init(&flow_keys_basic_dissector,
1832				flow_keys_basic_dissector_keys,
1833				ARRAY_SIZE(flow_keys_basic_dissector_keys));
1834	return 0;
1835}
1836core_initcall(init_default_flow_dissectors);