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 <linux/filter.h>
   9#include <net/dsa.h>
  10#include <net/dst_metadata.h>
  11#include <net/ip.h>
  12#include <net/ipv6.h>
  13#include <net/gre.h>
  14#include <net/pptp.h>
  15#include <net/tipc.h>
  16#include <linux/igmp.h>
  17#include <linux/icmp.h>
  18#include <linux/sctp.h>
  19#include <linux/dccp.h>
  20#include <linux/if_tunnel.h>
  21#include <linux/if_pppox.h>
  22#include <linux/ppp_defs.h>
  23#include <linux/stddef.h>
  24#include <linux/if_ether.h>
  25#include <linux/if_hsr.h>
  26#include <linux/mpls.h>
  27#include <linux/tcp.h>
  28#include <linux/ptp_classify.h>
  29#include <net/flow_dissector.h>
  30#include <net/pkt_cls.h>
  31#include <scsi/fc/fc_fcoe.h>
  32#include <uapi/linux/batadv_packet.h>
  33#include <linux/bpf.h>
  34#if IS_ENABLED(CONFIG_NF_CONNTRACK)
  35#include <net/netfilter/nf_conntrack_core.h>
  36#include <net/netfilter/nf_conntrack_labels.h>
  37#endif
  38#include <linux/bpf-netns.h>
  39
  40static void dissector_set_key(struct flow_dissector *flow_dissector,
  41			      enum flow_dissector_key_id key_id)
  42{
  43	flow_dissector->used_keys |= (1ULL << key_id);
  44}
  45
  46void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  47			     const struct flow_dissector_key *key,
  48			     unsigned int key_count)
  49{
  50	unsigned int i;
  51
  52	memset(flow_dissector, 0, sizeof(*flow_dissector));
  53
  54	for (i = 0; i < key_count; i++, key++) {
  55		/* User should make sure that every key target offset is within
  56		 * boundaries of unsigned short.
  57		 */
  58		BUG_ON(key->offset > USHRT_MAX);
  59		BUG_ON(dissector_uses_key(flow_dissector,
  60					  key->key_id));
  61
  62		dissector_set_key(flow_dissector, key->key_id);
  63		flow_dissector->offset[key->key_id] = key->offset;
  64	}
  65
  66	/* Ensure that the dissector always includes control and basic key.
  67	 * That way we are able to avoid handling lack of these in fast path.
  68	 */
  69	BUG_ON(!dissector_uses_key(flow_dissector,
  70				   FLOW_DISSECTOR_KEY_CONTROL));
  71	BUG_ON(!dissector_uses_key(flow_dissector,
  72				   FLOW_DISSECTOR_KEY_BASIC));
  73}
  74EXPORT_SYMBOL(skb_flow_dissector_init);
  75
  76#ifdef CONFIG_BPF_SYSCALL
  77int flow_dissector_bpf_prog_attach_check(struct net *net,
  78					 struct bpf_prog *prog)
  79{
  80	enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
  81
  82	if (net == &init_net) {
  83		/* BPF flow dissector in the root namespace overrides
  84		 * any per-net-namespace one. When attaching to root,
  85		 * make sure we don't have any BPF program attached
  86		 * to the non-root namespaces.
  87		 */
  88		struct net *ns;
 
  89
  90		for_each_net(ns) {
  91			if (ns == &init_net)
  92				continue;
  93			if (rcu_access_pointer(ns->bpf.run_array[type]))
  94				return -EEXIST;
  95		}
  96	} else {
  97		/* Make sure root flow dissector is not attached
  98		 * when attaching to the non-root namespace.
  99		 */
 100		if (rcu_access_pointer(init_net.bpf.run_array[type]))
 101			return -EEXIST;
 102	}
 103
 104	return 0;
 105}
 106#endif /* CONFIG_BPF_SYSCALL */
 107
 108/**
 109 * __skb_flow_get_ports - extract the upper layer ports and return them
 110 * @skb: sk_buff to extract the ports from
 111 * @thoff: transport header offset
 112 * @ip_proto: protocol for which to get port offset
 113 * @data: raw buffer pointer to the packet, if NULL use skb->data
 114 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 115 *
 116 * The function will try to retrieve the ports at offset thoff + poff where poff
 117 * is the protocol port offset returned from proto_ports_offset
 118 */
 119__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
 120			    const void *data, int hlen)
 121{
 122	int poff = proto_ports_offset(ip_proto);
 123
 124	if (!data) {
 125		data = skb->data;
 126		hlen = skb_headlen(skb);
 127	}
 128
 129	if (poff >= 0) {
 130		__be32 *ports, _ports;
 131
 132		ports = __skb_header_pointer(skb, thoff + poff,
 133					     sizeof(_ports), data, hlen, &_ports);
 134		if (ports)
 135			return *ports;
 136	}
 137
 138	return 0;
 139}
 140EXPORT_SYMBOL(__skb_flow_get_ports);
 141
 142static bool icmp_has_id(u8 type)
 143{
 144	switch (type) {
 145	case ICMP_ECHO:
 146	case ICMP_ECHOREPLY:
 147	case ICMP_TIMESTAMP:
 148	case ICMP_TIMESTAMPREPLY:
 149	case ICMPV6_ECHO_REQUEST:
 150	case ICMPV6_ECHO_REPLY:
 151		return true;
 152	}
 153
 154	return false;
 155}
 156
 157/**
 158 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
 159 * @skb: sk_buff to extract from
 160 * @key_icmp: struct flow_dissector_key_icmp to fill
 161 * @data: raw buffer pointer to the packet
 162 * @thoff: offset to extract at
 163 * @hlen: packet header length
 164 */
 165void skb_flow_get_icmp_tci(const struct sk_buff *skb,
 166			   struct flow_dissector_key_icmp *key_icmp,
 167			   const void *data, int thoff, int hlen)
 168{
 169	struct icmphdr *ih, _ih;
 170
 171	ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
 172	if (!ih)
 173		return;
 174
 175	key_icmp->type = ih->type;
 176	key_icmp->code = ih->code;
 177
 178	/* As we use 0 to signal that the Id field is not present,
 179	 * avoid confusion with packets without such field
 180	 */
 181	if (icmp_has_id(ih->type))
 182		key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1;
 183	else
 184		key_icmp->id = 0;
 185}
 186EXPORT_SYMBOL(skb_flow_get_icmp_tci);
 187
 188/* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
 189 * using skb_flow_get_icmp_tci().
 190 */
 191static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
 192				    struct flow_dissector *flow_dissector,
 193				    void *target_container, const void *data,
 194				    int thoff, int hlen)
 195{
 196	struct flow_dissector_key_icmp *key_icmp;
 197
 198	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
 199		return;
 200
 201	key_icmp = skb_flow_dissector_target(flow_dissector,
 202					     FLOW_DISSECTOR_KEY_ICMP,
 203					     target_container);
 204
 205	skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
 206}
 207
 208static void __skb_flow_dissect_ah(const struct sk_buff *skb,
 209				  struct flow_dissector *flow_dissector,
 210				  void *target_container, const void *data,
 211				  int nhoff, int hlen)
 212{
 213	struct flow_dissector_key_ipsec *key_ah;
 214	struct ip_auth_hdr _hdr, *hdr;
 215
 216	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC))
 217		return;
 218
 219	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 220	if (!hdr)
 221		return;
 222
 223	key_ah = skb_flow_dissector_target(flow_dissector,
 224					   FLOW_DISSECTOR_KEY_IPSEC,
 225					   target_container);
 226
 227	key_ah->spi = hdr->spi;
 228}
 229
 230static void __skb_flow_dissect_esp(const struct sk_buff *skb,
 231				   struct flow_dissector *flow_dissector,
 232				   void *target_container, const void *data,
 233				   int nhoff, int hlen)
 234{
 235	struct flow_dissector_key_ipsec *key_esp;
 236	struct ip_esp_hdr _hdr, *hdr;
 237
 238	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC))
 239		return;
 240
 241	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 242	if (!hdr)
 243		return;
 244
 245	key_esp = skb_flow_dissector_target(flow_dissector,
 246					    FLOW_DISSECTOR_KEY_IPSEC,
 247					    target_container);
 248
 249	key_esp->spi = hdr->spi;
 250}
 251
 252static void __skb_flow_dissect_l2tpv3(const struct sk_buff *skb,
 253				      struct flow_dissector *flow_dissector,
 254				      void *target_container, const void *data,
 255				      int nhoff, int hlen)
 256{
 257	struct flow_dissector_key_l2tpv3 *key_l2tpv3;
 258	struct {
 259		__be32 session_id;
 260	} *hdr, _hdr;
 261
 262	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_L2TPV3))
 263		return;
 264
 265	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 266	if (!hdr)
 267		return;
 268
 269	key_l2tpv3 = skb_flow_dissector_target(flow_dissector,
 270					       FLOW_DISSECTOR_KEY_L2TPV3,
 271					       target_container);
 272
 273	key_l2tpv3->session_id = hdr->session_id;
 274}
 275
 276void skb_flow_dissect_meta(const struct sk_buff *skb,
 277			   struct flow_dissector *flow_dissector,
 278			   void *target_container)
 279{
 280	struct flow_dissector_key_meta *meta;
 281
 282	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
 283		return;
 284
 285	meta = skb_flow_dissector_target(flow_dissector,
 286					 FLOW_DISSECTOR_KEY_META,
 287					 target_container);
 288	meta->ingress_ifindex = skb->skb_iif;
 289#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
 290	if (tc_skb_ext_tc_enabled()) {
 291		struct tc_skb_ext *ext;
 292
 293		ext = skb_ext_find(skb, TC_SKB_EXT);
 294		if (ext)
 295			meta->l2_miss = ext->l2_miss;
 296	}
 297#endif
 298}
 299EXPORT_SYMBOL(skb_flow_dissect_meta);
 300
 301static void
 302skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
 303				   struct flow_dissector *flow_dissector,
 304				   void *target_container)
 305{
 306	struct flow_dissector_key_control *ctrl;
 307
 308	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
 309		return;
 310
 311	ctrl = skb_flow_dissector_target(flow_dissector,
 312					 FLOW_DISSECTOR_KEY_ENC_CONTROL,
 313					 target_container);
 314	ctrl->addr_type = type;
 315}
 316
 317void
 318skb_flow_dissect_ct(const struct sk_buff *skb,
 319		    struct flow_dissector *flow_dissector,
 320		    void *target_container, u16 *ctinfo_map,
 321		    size_t mapsize, bool post_ct, u16 zone)
 322{
 323#if IS_ENABLED(CONFIG_NF_CONNTRACK)
 324	struct flow_dissector_key_ct *key;
 325	enum ip_conntrack_info ctinfo;
 326	struct nf_conn_labels *cl;
 327	struct nf_conn *ct;
 328
 329	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
 330		return;
 331
 332	ct = nf_ct_get(skb, &ctinfo);
 333	if (!ct && !post_ct)
 334		return;
 335
 336	key = skb_flow_dissector_target(flow_dissector,
 337					FLOW_DISSECTOR_KEY_CT,
 338					target_container);
 339
 340	if (!ct) {
 341		key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
 342				TCA_FLOWER_KEY_CT_FLAGS_INVALID;
 343		key->ct_zone = zone;
 344		return;
 345	}
 346
 347	if (ctinfo < mapsize)
 348		key->ct_state = ctinfo_map[ctinfo];
 349#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
 350	key->ct_zone = ct->zone.id;
 351#endif
 352#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 353	key->ct_mark = READ_ONCE(ct->mark);
 354#endif
 355
 356	cl = nf_ct_labels_find(ct);
 357	if (cl)
 358		memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
 359#endif /* CONFIG_NF_CONNTRACK */
 360}
 361EXPORT_SYMBOL(skb_flow_dissect_ct);
 362
 363void
 364skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 365			     struct flow_dissector *flow_dissector,
 366			     void *target_container)
 367{
 368	struct ip_tunnel_info *info;
 369	struct ip_tunnel_key *key;
 370
 371	/* A quick check to see if there might be something to do. */
 372	if (!dissector_uses_key(flow_dissector,
 373				FLOW_DISSECTOR_KEY_ENC_KEYID) &&
 374	    !dissector_uses_key(flow_dissector,
 375				FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
 376	    !dissector_uses_key(flow_dissector,
 377				FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
 378	    !dissector_uses_key(flow_dissector,
 379				FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
 380	    !dissector_uses_key(flow_dissector,
 381				FLOW_DISSECTOR_KEY_ENC_PORTS) &&
 382	    !dissector_uses_key(flow_dissector,
 383				FLOW_DISSECTOR_KEY_ENC_IP) &&
 384	    !dissector_uses_key(flow_dissector,
 385				FLOW_DISSECTOR_KEY_ENC_OPTS))
 386		return;
 387
 388	info = skb_tunnel_info(skb);
 389	if (!info)
 390		return;
 391
 392	key = &info->key;
 393
 394	switch (ip_tunnel_info_af(info)) {
 395	case AF_INET:
 396		skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 397						   flow_dissector,
 398						   target_container);
 399		if (dissector_uses_key(flow_dissector,
 400				       FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 401			struct flow_dissector_key_ipv4_addrs *ipv4;
 402
 403			ipv4 = skb_flow_dissector_target(flow_dissector,
 404							 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 405							 target_container);
 406			ipv4->src = key->u.ipv4.src;
 407			ipv4->dst = key->u.ipv4.dst;
 408		}
 409		break;
 410	case AF_INET6:
 411		skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 412						   flow_dissector,
 413						   target_container);
 414		if (dissector_uses_key(flow_dissector,
 415				       FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 416			struct flow_dissector_key_ipv6_addrs *ipv6;
 417
 418			ipv6 = skb_flow_dissector_target(flow_dissector,
 419							 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
 420							 target_container);
 421			ipv6->src = key->u.ipv6.src;
 422			ipv6->dst = key->u.ipv6.dst;
 423		}
 424		break;
 425	}
 426
 427	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
 428		struct flow_dissector_key_keyid *keyid;
 429
 430		keyid = skb_flow_dissector_target(flow_dissector,
 431						  FLOW_DISSECTOR_KEY_ENC_KEYID,
 432						  target_container);
 433		keyid->keyid = tunnel_id_to_key32(key->tun_id);
 434	}
 435
 436	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 437		struct flow_dissector_key_ports *tp;
 438
 439		tp = skb_flow_dissector_target(flow_dissector,
 440					       FLOW_DISSECTOR_KEY_ENC_PORTS,
 441					       target_container);
 442		tp->src = key->tp_src;
 443		tp->dst = key->tp_dst;
 444	}
 445
 446	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
 447		struct flow_dissector_key_ip *ip;
 448
 449		ip = skb_flow_dissector_target(flow_dissector,
 450					       FLOW_DISSECTOR_KEY_ENC_IP,
 451					       target_container);
 452		ip->tos = key->tos;
 453		ip->ttl = key->ttl;
 454	}
 455
 456	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 457		struct flow_dissector_key_enc_opts *enc_opt;
 458
 459		enc_opt = skb_flow_dissector_target(flow_dissector,
 460						    FLOW_DISSECTOR_KEY_ENC_OPTS,
 461						    target_container);
 462
 463		if (info->options_len) {
 464			enc_opt->len = info->options_len;
 465			ip_tunnel_info_opts_get(enc_opt->data, info);
 466			enc_opt->dst_opt_type = info->key.tun_flags &
 467						TUNNEL_OPTIONS_PRESENT;
 468		}
 469	}
 470}
 471EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
 472
 473void skb_flow_dissect_hash(const struct sk_buff *skb,
 474			   struct flow_dissector *flow_dissector,
 475			   void *target_container)
 476{
 477	struct flow_dissector_key_hash *key;
 478
 479	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))
 480		return;
 481
 482	key = skb_flow_dissector_target(flow_dissector,
 483					FLOW_DISSECTOR_KEY_HASH,
 484					target_container);
 485
 486	key->hash = skb_get_hash_raw(skb);
 487}
 488EXPORT_SYMBOL(skb_flow_dissect_hash);
 489
 490static enum flow_dissect_ret
 491__skb_flow_dissect_mpls(const struct sk_buff *skb,
 492			struct flow_dissector *flow_dissector,
 493			void *target_container, const void *data, int nhoff,
 494			int hlen, int lse_index, bool *entropy_label)
 495{
 496	struct mpls_label *hdr, _hdr;
 497	u32 entry, label, bos;
 
 498
 499	if (!dissector_uses_key(flow_dissector,
 500				FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 501	    !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 502		return FLOW_DISSECT_RET_OUT_GOOD;
 503
 504	if (lse_index >= FLOW_DIS_MPLS_MAX)
 505		return FLOW_DISSECT_RET_OUT_GOOD;
 506
 507	hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 508				   hlen, &_hdr);
 509	if (!hdr)
 510		return FLOW_DISSECT_RET_OUT_BAD;
 511
 512	entry = ntohl(hdr->entry);
 513	label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 514	bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
 515
 516	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 517		struct flow_dissector_key_mpls *key_mpls;
 518		struct flow_dissector_mpls_lse *lse;
 519
 520		key_mpls = skb_flow_dissector_target(flow_dissector,
 521						     FLOW_DISSECTOR_KEY_MPLS,
 522						     target_container);
 523		lse = &key_mpls->ls[lse_index];
 524
 525		lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
 526		lse->mpls_bos = bos;
 527		lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
 528		lse->mpls_label = label;
 529		dissector_set_mpls_lse(key_mpls, lse_index);
 530	}
 531
 532	if (*entropy_label &&
 533	    dissector_uses_key(flow_dissector,
 534			       FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
 535		struct flow_dissector_key_keyid *key_keyid;
 536
 537		key_keyid = skb_flow_dissector_target(flow_dissector,
 538						      FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 539						      target_container);
 540		key_keyid->keyid = cpu_to_be32(label);
 541	}
 542
 543	*entropy_label = label == MPLS_LABEL_ENTROPY;
 544
 545	return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN;
 546}
 547
 548static enum flow_dissect_ret
 549__skb_flow_dissect_arp(const struct sk_buff *skb,
 550		       struct flow_dissector *flow_dissector,
 551		       void *target_container, const void *data,
 552		       int nhoff, int hlen)
 553{
 554	struct flow_dissector_key_arp *key_arp;
 555	struct {
 556		unsigned char ar_sha[ETH_ALEN];
 557		unsigned char ar_sip[4];
 558		unsigned char ar_tha[ETH_ALEN];
 559		unsigned char ar_tip[4];
 560	} *arp_eth, _arp_eth;
 561	const struct arphdr *arp;
 562	struct arphdr _arp;
 563
 564	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 565		return FLOW_DISSECT_RET_OUT_GOOD;
 566
 567	arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 568				   hlen, &_arp);
 569	if (!arp)
 570		return FLOW_DISSECT_RET_OUT_BAD;
 571
 572	if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 573	    arp->ar_pro != htons(ETH_P_IP) ||
 574	    arp->ar_hln != ETH_ALEN ||
 575	    arp->ar_pln != 4 ||
 576	    (arp->ar_op != htons(ARPOP_REPLY) &&
 577	     arp->ar_op != htons(ARPOP_REQUEST)))
 578		return FLOW_DISSECT_RET_OUT_BAD;
 579
 580	arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 581				       sizeof(_arp_eth), data,
 582				       hlen, &_arp_eth);
 583	if (!arp_eth)
 584		return FLOW_DISSECT_RET_OUT_BAD;
 585
 586	key_arp = skb_flow_dissector_target(flow_dissector,
 587					    FLOW_DISSECTOR_KEY_ARP,
 588					    target_container);
 589
 590	memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 591	memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 592
 593	/* Only store the lower byte of the opcode;
 594	 * this covers ARPOP_REPLY and ARPOP_REQUEST.
 595	 */
 596	key_arp->op = ntohs(arp->ar_op) & 0xff;
 597
 598	ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 599	ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 600
 601	return FLOW_DISSECT_RET_OUT_GOOD;
 602}
 603
 604static enum flow_dissect_ret
 605__skb_flow_dissect_cfm(const struct sk_buff *skb,
 606		       struct flow_dissector *flow_dissector,
 607		       void *target_container, const void *data,
 608		       int nhoff, int hlen)
 609{
 610	struct flow_dissector_key_cfm *key, *hdr, _hdr;
 611
 612	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CFM))
 613		return FLOW_DISSECT_RET_OUT_GOOD;
 614
 615	hdr = __skb_header_pointer(skb, nhoff, sizeof(*key), data, hlen, &_hdr);
 616	if (!hdr)
 617		return FLOW_DISSECT_RET_OUT_BAD;
 618
 619	key = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_CFM,
 620					target_container);
 621
 622	key->mdl_ver = hdr->mdl_ver;
 623	key->opcode = hdr->opcode;
 624
 625	return FLOW_DISSECT_RET_OUT_GOOD;
 626}
 627
 628static enum flow_dissect_ret
 629__skb_flow_dissect_gre(const struct sk_buff *skb,
 630		       struct flow_dissector_key_control *key_control,
 631		       struct flow_dissector *flow_dissector,
 632		       void *target_container, const void *data,
 633		       __be16 *p_proto, int *p_nhoff, int *p_hlen,
 634		       unsigned int flags)
 635{
 636	struct flow_dissector_key_keyid *key_keyid;
 637	struct gre_base_hdr *hdr, _hdr;
 638	int offset = 0;
 639	u16 gre_ver;
 640
 641	hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 642				   data, *p_hlen, &_hdr);
 643	if (!hdr)
 644		return FLOW_DISSECT_RET_OUT_BAD;
 645
 646	/* Only look inside GRE without routing */
 647	if (hdr->flags & GRE_ROUTING)
 648		return FLOW_DISSECT_RET_OUT_GOOD;
 649
 650	/* Only look inside GRE for version 0 and 1 */
 651	gre_ver = ntohs(hdr->flags & GRE_VERSION);
 652	if (gre_ver > 1)
 653		return FLOW_DISSECT_RET_OUT_GOOD;
 654
 655	*p_proto = hdr->protocol;
 656	if (gre_ver) {
 657		/* Version1 must be PPTP, and check the flags */
 658		if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 659			return FLOW_DISSECT_RET_OUT_GOOD;
 660	}
 661
 662	offset += sizeof(struct gre_base_hdr);
 663
 664	if (hdr->flags & GRE_CSUM)
 665		offset += sizeof_field(struct gre_full_hdr, csum) +
 666			  sizeof_field(struct gre_full_hdr, reserved1);
 667
 668	if (hdr->flags & GRE_KEY) {
 669		const __be32 *keyid;
 670		__be32 _keyid;
 671
 672		keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 673					     sizeof(_keyid),
 674					     data, *p_hlen, &_keyid);
 675		if (!keyid)
 676			return FLOW_DISSECT_RET_OUT_BAD;
 677
 678		if (dissector_uses_key(flow_dissector,
 679				       FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 680			key_keyid = skb_flow_dissector_target(flow_dissector,
 681							      FLOW_DISSECTOR_KEY_GRE_KEYID,
 682							      target_container);
 683			if (gre_ver == 0)
 684				key_keyid->keyid = *keyid;
 685			else
 686				key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 687		}
 688		offset += sizeof_field(struct gre_full_hdr, key);
 689	}
 690
 691	if (hdr->flags & GRE_SEQ)
 692		offset += sizeof_field(struct pptp_gre_header, seq);
 693
 694	if (gre_ver == 0) {
 695		if (*p_proto == htons(ETH_P_TEB)) {
 696			const struct ethhdr *eth;
 697			struct ethhdr _eth;
 698
 699			eth = __skb_header_pointer(skb, *p_nhoff + offset,
 700						   sizeof(_eth),
 701						   data, *p_hlen, &_eth);
 702			if (!eth)
 703				return FLOW_DISSECT_RET_OUT_BAD;
 704			*p_proto = eth->h_proto;
 705			offset += sizeof(*eth);
 706
 707			/* Cap headers that we access via pointers at the
 708			 * end of the Ethernet header as our maximum alignment
 709			 * at that point is only 2 bytes.
 710			 */
 711			if (NET_IP_ALIGN)
 712				*p_hlen = *p_nhoff + offset;
 713		}
 714	} else { /* version 1, must be PPTP */
 715		u8 _ppp_hdr[PPP_HDRLEN];
 716		u8 *ppp_hdr;
 717
 718		if (hdr->flags & GRE_ACK)
 719			offset += sizeof_field(struct pptp_gre_header, ack);
 720
 721		ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 722					       sizeof(_ppp_hdr),
 723					       data, *p_hlen, _ppp_hdr);
 724		if (!ppp_hdr)
 725			return FLOW_DISSECT_RET_OUT_BAD;
 726
 727		switch (PPP_PROTOCOL(ppp_hdr)) {
 728		case PPP_IP:
 729			*p_proto = htons(ETH_P_IP);
 730			break;
 731		case PPP_IPV6:
 732			*p_proto = htons(ETH_P_IPV6);
 733			break;
 734		default:
 735			/* Could probably catch some more like MPLS */
 736			break;
 737		}
 738
 739		offset += PPP_HDRLEN;
 740	}
 741
 742	*p_nhoff += offset;
 743	key_control->flags |= FLOW_DIS_ENCAPSULATION;
 744	if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 745		return FLOW_DISSECT_RET_OUT_GOOD;
 746
 747	return FLOW_DISSECT_RET_PROTO_AGAIN;
 748}
 749
 750/**
 751 * __skb_flow_dissect_batadv() - dissect batman-adv header
 752 * @skb: sk_buff to with the batman-adv header
 753 * @key_control: flow dissectors control key
 754 * @data: raw buffer pointer to the packet, if NULL use skb->data
 755 * @p_proto: pointer used to update the protocol to process next
 756 * @p_nhoff: pointer used to update inner network header offset
 757 * @hlen: packet header length
 758 * @flags: any combination of FLOW_DISSECTOR_F_*
 759 *
 760 * ETH_P_BATMAN packets are tried to be dissected. Only
 761 * &struct batadv_unicast packets are actually processed because they contain an
 762 * inner ethernet header and are usually followed by actual network header. This
 763 * allows the flow dissector to continue processing the packet.
 764 *
 765 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
 766 *  FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
 767 *  otherwise FLOW_DISSECT_RET_OUT_BAD
 768 */
 769static enum flow_dissect_ret
 770__skb_flow_dissect_batadv(const struct sk_buff *skb,
 771			  struct flow_dissector_key_control *key_control,
 772			  const void *data, __be16 *p_proto, int *p_nhoff,
 773			  int hlen, unsigned int flags)
 774{
 775	struct {
 776		struct batadv_unicast_packet batadv_unicast;
 777		struct ethhdr eth;
 778	} *hdr, _hdr;
 779
 780	hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
 781				   &_hdr);
 782	if (!hdr)
 783		return FLOW_DISSECT_RET_OUT_BAD;
 784
 785	if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
 786		return FLOW_DISSECT_RET_OUT_BAD;
 787
 788	if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
 789		return FLOW_DISSECT_RET_OUT_BAD;
 790
 791	*p_proto = hdr->eth.h_proto;
 792	*p_nhoff += sizeof(*hdr);
 793
 794	key_control->flags |= FLOW_DIS_ENCAPSULATION;
 795	if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 796		return FLOW_DISSECT_RET_OUT_GOOD;
 797
 798	return FLOW_DISSECT_RET_PROTO_AGAIN;
 799}
 800
 801static void
 802__skb_flow_dissect_tcp(const struct sk_buff *skb,
 803		       struct flow_dissector *flow_dissector,
 804		       void *target_container, const void *data,
 805		       int thoff, int hlen)
 806{
 807	struct flow_dissector_key_tcp *key_tcp;
 808	struct tcphdr *th, _th;
 809
 810	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 811		return;
 812
 813	th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 814	if (!th)
 815		return;
 816
 817	if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 818		return;
 819
 820	key_tcp = skb_flow_dissector_target(flow_dissector,
 821					    FLOW_DISSECTOR_KEY_TCP,
 822					    target_container);
 823	key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 824}
 825
 826static void
 827__skb_flow_dissect_ports(const struct sk_buff *skb,
 828			 struct flow_dissector *flow_dissector,
 829			 void *target_container, const void *data,
 830			 int nhoff, u8 ip_proto, int hlen)
 831{
 832	enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
 833	struct flow_dissector_key_ports *key_ports;
 834
 835	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 836		dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
 837	else if (dissector_uses_key(flow_dissector,
 838				    FLOW_DISSECTOR_KEY_PORTS_RANGE))
 839		dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
 840
 841	if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
 842		return;
 843
 844	key_ports = skb_flow_dissector_target(flow_dissector,
 845					      dissector_ports,
 846					      target_container);
 847	key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 848						data, hlen);
 849}
 850
 851static void
 852__skb_flow_dissect_ipv4(const struct sk_buff *skb,
 853			struct flow_dissector *flow_dissector,
 854			void *target_container, const void *data,
 855			const struct iphdr *iph)
 856{
 857	struct flow_dissector_key_ip *key_ip;
 858
 859	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 860		return;
 861
 862	key_ip = skb_flow_dissector_target(flow_dissector,
 863					   FLOW_DISSECTOR_KEY_IP,
 864					   target_container);
 865	key_ip->tos = iph->tos;
 866	key_ip->ttl = iph->ttl;
 867}
 868
 869static void
 870__skb_flow_dissect_ipv6(const struct sk_buff *skb,
 871			struct flow_dissector *flow_dissector,
 872			void *target_container, const void *data,
 873			const struct ipv6hdr *iph)
 874{
 875	struct flow_dissector_key_ip *key_ip;
 876
 877	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 878		return;
 879
 880	key_ip = skb_flow_dissector_target(flow_dissector,
 881					   FLOW_DISSECTOR_KEY_IP,
 882					   target_container);
 883	key_ip->tos = ipv6_get_dsfield(iph);
 884	key_ip->ttl = iph->hop_limit;
 885}
 886
 887/* Maximum number of protocol headers that can be parsed in
 888 * __skb_flow_dissect
 889 */
 890#define MAX_FLOW_DISSECT_HDRS	15
 891
 892static bool skb_flow_dissect_allowed(int *num_hdrs)
 893{
 894	++*num_hdrs;
 895
 896	return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
 897}
 898
 899static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
 900				     struct flow_dissector *flow_dissector,
 901				     void *target_container)
 902{
 903	struct flow_dissector_key_ports *key_ports = NULL;
 904	struct flow_dissector_key_control *key_control;
 905	struct flow_dissector_key_basic *key_basic;
 906	struct flow_dissector_key_addrs *key_addrs;
 907	struct flow_dissector_key_tags *key_tags;
 908
 909	key_control = skb_flow_dissector_target(flow_dissector,
 910						FLOW_DISSECTOR_KEY_CONTROL,
 911						target_container);
 912	key_control->thoff = flow_keys->thoff;
 913	if (flow_keys->is_frag)
 914		key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 915	if (flow_keys->is_first_frag)
 916		key_control->flags |= FLOW_DIS_FIRST_FRAG;
 917	if (flow_keys->is_encap)
 918		key_control->flags |= FLOW_DIS_ENCAPSULATION;
 919
 920	key_basic = skb_flow_dissector_target(flow_dissector,
 921					      FLOW_DISSECTOR_KEY_BASIC,
 922					      target_container);
 923	key_basic->n_proto = flow_keys->n_proto;
 924	key_basic->ip_proto = flow_keys->ip_proto;
 925
 926	if (flow_keys->addr_proto == ETH_P_IP &&
 927	    dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 928		key_addrs = skb_flow_dissector_target(flow_dissector,
 929						      FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 930						      target_container);
 931		key_addrs->v4addrs.src = flow_keys->ipv4_src;
 932		key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
 933		key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 934	} else if (flow_keys->addr_proto == ETH_P_IPV6 &&
 935		   dissector_uses_key(flow_dissector,
 936				      FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 937		key_addrs = skb_flow_dissector_target(flow_dissector,
 938						      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 939						      target_container);
 940		memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
 941		       sizeof(key_addrs->v6addrs.src));
 942		memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
 943		       sizeof(key_addrs->v6addrs.dst));
 944		key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 945	}
 946
 947	if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 948		key_ports = skb_flow_dissector_target(flow_dissector,
 949						      FLOW_DISSECTOR_KEY_PORTS,
 950						      target_container);
 951	else if (dissector_uses_key(flow_dissector,
 952				    FLOW_DISSECTOR_KEY_PORTS_RANGE))
 953		key_ports = skb_flow_dissector_target(flow_dissector,
 954						      FLOW_DISSECTOR_KEY_PORTS_RANGE,
 955						      target_container);
 956
 957	if (key_ports) {
 958		key_ports->src = flow_keys->sport;
 959		key_ports->dst = flow_keys->dport;
 960	}
 961
 962	if (dissector_uses_key(flow_dissector,
 963			       FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 964		key_tags = skb_flow_dissector_target(flow_dissector,
 965						     FLOW_DISSECTOR_KEY_FLOW_LABEL,
 966						     target_container);
 967		key_tags->flow_label = ntohl(flow_keys->flow_label);
 968	}
 969}
 970
 971u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 972		     __be16 proto, int nhoff, int hlen, unsigned int flags)
 973{
 974	struct bpf_flow_keys *flow_keys = ctx->flow_keys;
 975	u32 result;
 976
 977	/* Pass parameters to the BPF program */
 978	memset(flow_keys, 0, sizeof(*flow_keys));
 979	flow_keys->n_proto = proto;
 980	flow_keys->nhoff = nhoff;
 981	flow_keys->thoff = flow_keys->nhoff;
 982
 983	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
 984		     (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
 985	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
 986		     (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 987	BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
 988		     (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
 989	flow_keys->flags = flags;
 990
 991	result = bpf_prog_run_pin_on_cpu(prog, ctx);
 992
 993	flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
 994	flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
 995				   flow_keys->nhoff, hlen);
 996
 997	return result;
 998}
 999
1000static bool is_pppoe_ses_hdr_valid(const struct pppoe_hdr *hdr)
1001{
1002	return hdr->ver == 1 && hdr->type == 1 && hdr->code == 0;
1003}
1004
1005/**
1006 * __skb_flow_dissect - extract the flow_keys struct and return it
1007 * @net: associated network namespace, derived from @skb if NULL
1008 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
1009 * @flow_dissector: list of keys to dissect
1010 * @target_container: target structure to put dissected values into
1011 * @data: raw buffer pointer to the packet, if NULL use skb->data
1012 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
1013 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
1014 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
1015 * @flags: flags that control the dissection process, e.g.
1016 *         FLOW_DISSECTOR_F_STOP_AT_ENCAP.
1017 *
1018 * The function will try to retrieve individual keys into target specified
1019 * by flow_dissector from either the skbuff or a raw buffer specified by the
1020 * rest parameters.
1021 *
1022 * Caller must take care of zeroing target container memory.
1023 */
1024bool __skb_flow_dissect(const struct net *net,
1025			const struct sk_buff *skb,
1026			struct flow_dissector *flow_dissector,
1027			void *target_container, const void *data,
1028			__be16 proto, int nhoff, int hlen, unsigned int flags)
 
1029{
1030	struct flow_dissector_key_control *key_control;
1031	struct flow_dissector_key_basic *key_basic;
1032	struct flow_dissector_key_addrs *key_addrs;
 
 
1033	struct flow_dissector_key_tags *key_tags;
1034	struct flow_dissector_key_vlan *key_vlan;
1035	enum flow_dissect_ret fdret;
1036	enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
1037	bool mpls_el = false;
1038	int mpls_lse = 0;
1039	int num_hdrs = 0;
1040	u8 ip_proto = 0;
1041	bool ret;
1042
1043	if (!data) {
1044		data = skb->data;
1045		proto = skb_vlan_tag_present(skb) ?
1046			 skb->vlan_proto : skb->protocol;
1047		nhoff = skb_network_offset(skb);
1048		hlen = skb_headlen(skb);
1049#if IS_ENABLED(CONFIG_NET_DSA)
1050		if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
1051			     proto == htons(ETH_P_XDSA))) {
1052			struct metadata_dst *md_dst = skb_metadata_dst(skb);
1053			const struct dsa_device_ops *ops;
1054			int offset = 0;
1055
1056			ops = skb->dev->dsa_ptr->tag_ops;
1057			/* Only DSA header taggers break flow dissection */
1058			if (ops->needed_headroom &&
1059			    (!md_dst || md_dst->type != METADATA_HW_PORT_MUX)) {
1060				if (ops->flow_dissect)
1061					ops->flow_dissect(skb, &proto, &offset);
1062				else
1063					dsa_tag_generic_flow_dissect(skb,
1064								     &proto,
1065								     &offset);
1066				hlen -= offset;
1067				nhoff += offset;
1068			}
1069		}
1070#endif
1071	}
1072
1073	/* It is ensured by skb_flow_dissector_init() that control key will
1074	 * be always present.
1075	 */
1076	key_control = skb_flow_dissector_target(flow_dissector,
1077						FLOW_DISSECTOR_KEY_CONTROL,
1078						target_container);
1079
1080	/* It is ensured by skb_flow_dissector_init() that basic key will
1081	 * be always present.
1082	 */
1083	key_basic = skb_flow_dissector_target(flow_dissector,
1084					      FLOW_DISSECTOR_KEY_BASIC,
1085					      target_container);
1086
1087	if (skb) {
1088		if (!net) {
1089			if (skb->dev)
1090				net = dev_net(skb->dev);
1091			else if (skb->sk)
1092				net = sock_net(skb->sk);
1093		}
1094	}
1095
1096	WARN_ON_ONCE(!net);
1097	if (net) {
1098		enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
1099		struct bpf_prog_array *run_array;
1100
1101		rcu_read_lock();
1102		run_array = rcu_dereference(init_net.bpf.run_array[type]);
1103		if (!run_array)
1104			run_array = rcu_dereference(net->bpf.run_array[type]);
1105
1106		if (run_array) {
1107			struct bpf_flow_keys flow_keys;
1108			struct bpf_flow_dissector ctx = {
1109				.flow_keys = &flow_keys,
1110				.data = data,
1111				.data_end = data + hlen,
1112			};
1113			__be16 n_proto = proto;
1114			struct bpf_prog *prog;
1115			u32 result;
1116
1117			if (skb) {
1118				ctx.skb = skb;
1119				/* we can't use 'proto' in the skb case
1120				 * because it might be set to skb->vlan_proto
1121				 * which has been pulled from the data
1122				 */
1123				n_proto = skb->protocol;
1124			}
1125
1126			prog = READ_ONCE(run_array->items[0].prog);
1127			result = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1128						  hlen, flags);
1129			if (result == BPF_FLOW_DISSECTOR_CONTINUE)
1130				goto dissect_continue;
1131			__skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1132						 target_container);
1133			rcu_read_unlock();
1134			return result == BPF_OK;
1135		}
1136dissect_continue:
1137		rcu_read_unlock();
1138	}
1139
1140	if (dissector_uses_key(flow_dissector,
1141			       FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1142		struct ethhdr *eth = eth_hdr(skb);
1143		struct flow_dissector_key_eth_addrs *key_eth_addrs;
1144
1145		key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1146							  FLOW_DISSECTOR_KEY_ETH_ADDRS,
1147							  target_container);
1148		memcpy(key_eth_addrs, eth, sizeof(*key_eth_addrs));
1149	}
1150
1151	if (dissector_uses_key(flow_dissector,
1152			       FLOW_DISSECTOR_KEY_NUM_OF_VLANS)) {
1153		struct flow_dissector_key_num_of_vlans *key_num_of_vlans;
1154
1155		key_num_of_vlans = skb_flow_dissector_target(flow_dissector,
1156							     FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1157							     target_container);
1158		key_num_of_vlans->num_of_vlans = 0;
1159	}
1160
1161proto_again:
1162	fdret = FLOW_DISSECT_RET_CONTINUE;
1163
1164	switch (proto) {
1165	case htons(ETH_P_IP): {
1166		const struct iphdr *iph;
1167		struct iphdr _iph;
1168
1169		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1170		if (!iph || iph->ihl < 5) {
1171			fdret = FLOW_DISSECT_RET_OUT_BAD;
1172			break;
1173		}
1174
1175		nhoff += iph->ihl * 4;
1176
1177		ip_proto = iph->protocol;
1178
1179		if (dissector_uses_key(flow_dissector,
1180				       FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1181			key_addrs = skb_flow_dissector_target(flow_dissector,
1182							      FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1183							      target_container);
1184
1185			memcpy(&key_addrs->v4addrs.src, &iph->saddr,
1186			       sizeof(key_addrs->v4addrs.src));
1187			memcpy(&key_addrs->v4addrs.dst, &iph->daddr,
1188			       sizeof(key_addrs->v4addrs.dst));
1189			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1190		}
1191
1192		__skb_flow_dissect_ipv4(skb, flow_dissector,
1193					target_container, data, iph);
1194
1195		if (ip_is_fragment(iph)) {
1196			key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1197
1198			if (iph->frag_off & htons(IP_OFFSET)) {
1199				fdret = FLOW_DISSECT_RET_OUT_GOOD;
1200				break;
1201			} else {
1202				key_control->flags |= FLOW_DIS_FIRST_FRAG;
1203				if (!(flags &
1204				      FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1205					fdret = FLOW_DISSECT_RET_OUT_GOOD;
1206					break;
1207				}
1208			}
1209		}
1210
 
 
 
 
 
 
 
 
1211		break;
1212	}
1213	case htons(ETH_P_IPV6): {
1214		const struct ipv6hdr *iph;
1215		struct ipv6hdr _iph;
1216
1217		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1218		if (!iph) {
1219			fdret = FLOW_DISSECT_RET_OUT_BAD;
1220			break;
1221		}
1222
1223		ip_proto = iph->nexthdr;
1224		nhoff += sizeof(struct ipv6hdr);
1225
1226		if (dissector_uses_key(flow_dissector,
1227				       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1228			key_addrs = skb_flow_dissector_target(flow_dissector,
1229							      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1230							      target_container);
1231
1232			memcpy(&key_addrs->v6addrs.src, &iph->saddr,
1233			       sizeof(key_addrs->v6addrs.src));
1234			memcpy(&key_addrs->v6addrs.dst, &iph->daddr,
1235			       sizeof(key_addrs->v6addrs.dst));
1236			key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1237		}
1238
1239		if ((dissector_uses_key(flow_dissector,
1240					FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1241		     (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1242		    ip6_flowlabel(iph)) {
1243			__be32 flow_label = ip6_flowlabel(iph);
1244
1245			if (dissector_uses_key(flow_dissector,
1246					       FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1247				key_tags = skb_flow_dissector_target(flow_dissector,
1248								     FLOW_DISSECTOR_KEY_FLOW_LABEL,
1249								     target_container);
1250				key_tags->flow_label = ntohl(flow_label);
1251			}
1252			if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1253				fdret = FLOW_DISSECT_RET_OUT_GOOD;
1254				break;
1255			}
1256		}
1257
1258		__skb_flow_dissect_ipv6(skb, flow_dissector,
1259					target_container, data, iph);
1260
 
 
 
1261		break;
1262	}
1263	case htons(ETH_P_8021AD):
1264	case htons(ETH_P_8021Q): {
1265		const struct vlan_hdr *vlan = NULL;
1266		struct vlan_hdr _vlan;
1267		__be16 saved_vlan_tpid = proto;
1268
1269		if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1270		    skb && skb_vlan_tag_present(skb)) {
1271			proto = skb->protocol;
1272		} else {
 
1273			vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1274						    data, hlen, &_vlan);
1275			if (!vlan) {
1276				fdret = FLOW_DISSECT_RET_OUT_BAD;
1277				break;
1278			}
1279
1280			proto = vlan->h_vlan_encapsulated_proto;
1281			nhoff += sizeof(*vlan);
 
 
 
 
1282		}
1283
1284		if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_NUM_OF_VLANS) &&
1285		    !(key_control->flags & FLOW_DIS_ENCAPSULATION)) {
1286			struct flow_dissector_key_num_of_vlans *key_nvs;
1287
1288			key_nvs = skb_flow_dissector_target(flow_dissector,
1289							    FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1290							    target_container);
1291			key_nvs->num_of_vlans++;
1292		}
1293
1294		if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1295			dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1296		} else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1297			dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1298		} else {
1299			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1300			break;
1301		}
1302
1303		if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1304			key_vlan = skb_flow_dissector_target(flow_dissector,
1305							     dissector_vlan,
1306							     target_container);
1307
1308			if (!vlan) {
1309				key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1310				key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
 
1311			} else {
1312				key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1313					VLAN_VID_MASK;
1314				key_vlan->vlan_priority =
1315					(ntohs(vlan->h_vlan_TCI) &
1316					 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1317			}
1318			key_vlan->vlan_tpid = saved_vlan_tpid;
1319			key_vlan->vlan_eth_type = proto;
1320		}
1321
1322		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1323		break;
1324	}
1325	case htons(ETH_P_PPP_SES): {
1326		struct {
1327			struct pppoe_hdr hdr;
1328			__be16 proto;
1329		} *hdr, _hdr;
1330		u16 ppp_proto;
1331
1332		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1333		if (!hdr) {
1334			fdret = FLOW_DISSECT_RET_OUT_BAD;
1335			break;
1336		}
1337
1338		if (!is_pppoe_ses_hdr_valid(&hdr->hdr)) {
1339			fdret = FLOW_DISSECT_RET_OUT_BAD;
1340			break;
1341		}
1342
1343		/* least significant bit of the most significant octet
1344		 * indicates if protocol field was compressed
1345		 */
1346		ppp_proto = ntohs(hdr->proto);
1347		if (ppp_proto & 0x0100) {
1348			ppp_proto = ppp_proto >> 8;
1349			nhoff += PPPOE_SES_HLEN - 1;
1350		} else {
1351			nhoff += PPPOE_SES_HLEN;
1352		}
1353
1354		if (ppp_proto == PPP_IP) {
1355			proto = htons(ETH_P_IP);
1356			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1357		} else if (ppp_proto == PPP_IPV6) {
 
1358			proto = htons(ETH_P_IPV6);
1359			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1360		} else if (ppp_proto == PPP_MPLS_UC) {
1361			proto = htons(ETH_P_MPLS_UC);
1362			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1363		} else if (ppp_proto == PPP_MPLS_MC) {
1364			proto = htons(ETH_P_MPLS_MC);
1365			fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1366		} else if (ppp_proto_is_valid(ppp_proto)) {
1367			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1368		} else {
1369			fdret = FLOW_DISSECT_RET_OUT_BAD;
1370			break;
1371		}
1372
1373		if (dissector_uses_key(flow_dissector,
1374				       FLOW_DISSECTOR_KEY_PPPOE)) {
1375			struct flow_dissector_key_pppoe *key_pppoe;
1376
1377			key_pppoe = skb_flow_dissector_target(flow_dissector,
1378							      FLOW_DISSECTOR_KEY_PPPOE,
1379							      target_container);
1380			key_pppoe->session_id = hdr->hdr.sid;
1381			key_pppoe->ppp_proto = htons(ppp_proto);
1382			key_pppoe->type = htons(ETH_P_PPP_SES);
1383		}
1384		break;
1385	}
1386	case htons(ETH_P_TIPC): {
1387		struct tipc_basic_hdr *hdr, _hdr;
1388
1389		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1390					   data, hlen, &_hdr);
1391		if (!hdr) {
1392			fdret = FLOW_DISSECT_RET_OUT_BAD;
1393			break;
1394		}
1395
1396		if (dissector_uses_key(flow_dissector,
1397				       FLOW_DISSECTOR_KEY_TIPC)) {
1398			key_addrs = skb_flow_dissector_target(flow_dissector,
1399							      FLOW_DISSECTOR_KEY_TIPC,
1400							      target_container);
1401			key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1402			key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1403		}
1404		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1405		break;
1406	}
1407
1408	case htons(ETH_P_MPLS_UC):
1409	case htons(ETH_P_MPLS_MC):
1410		fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1411						target_container, data,
1412						nhoff, hlen, mpls_lse,
1413						&mpls_el);
1414		nhoff += sizeof(struct mpls_label);
1415		mpls_lse++;
1416		break;
1417	case htons(ETH_P_FCOE):
1418		if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1419			fdret = FLOW_DISSECT_RET_OUT_BAD;
1420			break;
1421		}
1422
1423		nhoff += FCOE_HEADER_LEN;
1424		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1425		break;
1426
1427	case htons(ETH_P_ARP):
1428	case htons(ETH_P_RARP):
1429		fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1430					       target_container, data,
1431					       nhoff, hlen);
1432		break;
1433
1434	case htons(ETH_P_BATMAN):
1435		fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1436						  &proto, &nhoff, hlen, flags);
1437		break;
1438
1439	case htons(ETH_P_1588): {
1440		struct ptp_header *hdr, _hdr;
1441
1442		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1443					   hlen, &_hdr);
1444		if (!hdr) {
1445			fdret = FLOW_DISSECT_RET_OUT_BAD;
1446			break;
1447		}
1448
1449		nhoff += sizeof(struct ptp_header);
1450		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1451		break;
1452	}
1453
1454	case htons(ETH_P_PRP):
1455	case htons(ETH_P_HSR): {
1456		struct hsr_tag *hdr, _hdr;
1457
1458		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen,
1459					   &_hdr);
1460		if (!hdr) {
1461			fdret = FLOW_DISSECT_RET_OUT_BAD;
1462			break;
1463		}
1464
1465		proto = hdr->encap_proto;
1466		nhoff += HSR_HLEN;
1467		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1468		break;
1469	}
1470
1471	case htons(ETH_P_CFM):
1472		fdret = __skb_flow_dissect_cfm(skb, flow_dissector,
1473					       target_container, data,
1474					       nhoff, hlen);
1475		break;
1476
1477	default:
1478		fdret = FLOW_DISSECT_RET_OUT_BAD;
1479		break;
1480	}
1481
1482	/* Process result of proto processing */
1483	switch (fdret) {
1484	case FLOW_DISSECT_RET_OUT_GOOD:
1485		goto out_good;
1486	case FLOW_DISSECT_RET_PROTO_AGAIN:
1487		if (skb_flow_dissect_allowed(&num_hdrs))
1488			goto proto_again;
1489		goto out_good;
1490	case FLOW_DISSECT_RET_CONTINUE:
1491	case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1492		break;
1493	case FLOW_DISSECT_RET_OUT_BAD:
1494	default:
1495		goto out_bad;
1496	}
1497
1498ip_proto_again:
1499	fdret = FLOW_DISSECT_RET_CONTINUE;
1500
1501	switch (ip_proto) {
1502	case IPPROTO_GRE:
1503		if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1504			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1505			break;
1506		}
1507
1508		fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1509					       target_container, data,
1510					       &proto, &nhoff, &hlen, flags);
1511		break;
1512
1513	case NEXTHDR_HOP:
1514	case NEXTHDR_ROUTING:
1515	case NEXTHDR_DEST: {
1516		u8 _opthdr[2], *opthdr;
1517
1518		if (proto != htons(ETH_P_IPV6))
1519			break;
1520
1521		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1522					      data, hlen, &_opthdr);
1523		if (!opthdr) {
1524			fdret = FLOW_DISSECT_RET_OUT_BAD;
1525			break;
1526		}
1527
1528		ip_proto = opthdr[0];
1529		nhoff += (opthdr[1] + 1) << 3;
1530
1531		fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1532		break;
1533	}
1534	case NEXTHDR_FRAGMENT: {
1535		struct frag_hdr _fh, *fh;
1536
1537		if (proto != htons(ETH_P_IPV6))
1538			break;
1539
1540		fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1541					  data, hlen, &_fh);
1542
1543		if (!fh) {
1544			fdret = FLOW_DISSECT_RET_OUT_BAD;
1545			break;
1546		}
1547
1548		key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1549
1550		nhoff += sizeof(_fh);
1551		ip_proto = fh->nexthdr;
1552
1553		if (!(fh->frag_off & htons(IP6_OFFSET))) {
1554			key_control->flags |= FLOW_DIS_FIRST_FRAG;
1555			if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1556				fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1557				break;
1558			}
1559		}
1560
1561		fdret = FLOW_DISSECT_RET_OUT_GOOD;
1562		break;
1563	}
1564	case IPPROTO_IPIP:
1565		if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1566			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1567			break;
1568		}
1569
1570		proto = htons(ETH_P_IP);
1571
1572		key_control->flags |= FLOW_DIS_ENCAPSULATION;
1573		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1574			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1575			break;
1576		}
1577
1578		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1579		break;
1580
1581	case IPPROTO_IPV6:
1582		if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1583			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1584			break;
1585		}
1586
1587		proto = htons(ETH_P_IPV6);
1588
1589		key_control->flags |= FLOW_DIS_ENCAPSULATION;
1590		if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1591			fdret = FLOW_DISSECT_RET_OUT_GOOD;
1592			break;
1593		}
1594
1595		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1596		break;
1597
1598
1599	case IPPROTO_MPLS:
1600		proto = htons(ETH_P_MPLS_UC);
1601		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1602		break;
1603
1604	case IPPROTO_TCP:
1605		__skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1606				       data, nhoff, hlen);
1607		break;
1608
1609	case IPPROTO_ICMP:
1610	case IPPROTO_ICMPV6:
1611		__skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1612					data, nhoff, hlen);
1613		break;
1614	case IPPROTO_L2TP:
1615		__skb_flow_dissect_l2tpv3(skb, flow_dissector, target_container,
1616					  data, nhoff, hlen);
1617		break;
1618	case IPPROTO_ESP:
1619		__skb_flow_dissect_esp(skb, flow_dissector, target_container,
1620				       data, nhoff, hlen);
1621		break;
1622	case IPPROTO_AH:
1623		__skb_flow_dissect_ah(skb, flow_dissector, target_container,
1624				      data, nhoff, hlen);
1625		break;
1626	default:
1627		break;
1628	}
1629
1630	if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1631		__skb_flow_dissect_ports(skb, flow_dissector, target_container,
1632					 data, nhoff, ip_proto, hlen);
 
 
 
 
 
 
 
 
 
 
 
 
 
1633
1634	/* Process result of IP proto processing */
1635	switch (fdret) {
1636	case FLOW_DISSECT_RET_PROTO_AGAIN:
1637		if (skb_flow_dissect_allowed(&num_hdrs))
1638			goto proto_again;
1639		break;
1640	case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1641		if (skb_flow_dissect_allowed(&num_hdrs))
1642			goto ip_proto_again;
1643		break;
1644	case FLOW_DISSECT_RET_OUT_GOOD:
1645	case FLOW_DISSECT_RET_CONTINUE:
1646		break;
1647	case FLOW_DISSECT_RET_OUT_BAD:
1648	default:
1649		goto out_bad;
1650	}
1651
1652out_good:
1653	ret = true;
1654
1655out:
1656	key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1657	key_basic->n_proto = proto;
1658	key_basic->ip_proto = ip_proto;
1659
1660	return ret;
1661
1662out_bad:
1663	ret = false;
1664	goto out;
1665}
1666EXPORT_SYMBOL(__skb_flow_dissect);
1667
1668static siphash_aligned_key_t hashrnd;
1669static __always_inline void __flow_hash_secret_init(void)
1670{
1671	net_get_random_once(&hashrnd, sizeof(hashrnd));
1672}
1673
1674static const void *flow_keys_hash_start(const struct flow_keys *flow)
 
1675{
1676	BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1677	return &flow->FLOW_KEYS_HASH_START_FIELD;
 
 
 
 
 
 
 
1678}
1679
1680static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1681{
1682	size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1683
1684	BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
 
 
1685
1686	switch (flow->control.addr_type) {
1687	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1688		diff -= sizeof(flow->addrs.v4addrs);
1689		break;
1690	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1691		diff -= sizeof(flow->addrs.v6addrs);
1692		break;
1693	case FLOW_DISSECTOR_KEY_TIPC:
1694		diff -= sizeof(flow->addrs.tipckey);
1695		break;
1696	}
1697	return sizeof(*flow) - diff;
1698}
1699
1700__be32 flow_get_u32_src(const struct flow_keys *flow)
1701{
1702	switch (flow->control.addr_type) {
1703	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1704		return flow->addrs.v4addrs.src;
1705	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1706		return (__force __be32)ipv6_addr_hash(
1707			&flow->addrs.v6addrs.src);
1708	case FLOW_DISSECTOR_KEY_TIPC:
1709		return flow->addrs.tipckey.key;
1710	default:
1711		return 0;
1712	}
1713}
1714EXPORT_SYMBOL(flow_get_u32_src);
1715
1716__be32 flow_get_u32_dst(const struct flow_keys *flow)
1717{
1718	switch (flow->control.addr_type) {
1719	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1720		return flow->addrs.v4addrs.dst;
1721	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1722		return (__force __be32)ipv6_addr_hash(
1723			&flow->addrs.v6addrs.dst);
1724	default:
1725		return 0;
1726	}
1727}
1728EXPORT_SYMBOL(flow_get_u32_dst);
1729
1730/* Sort the source and destination IP and the ports,
1731 * to have consistent hash within the two directions
1732 */
1733static inline void __flow_hash_consistentify(struct flow_keys *keys)
1734{
1735	int addr_diff, i;
1736
1737	switch (keys->control.addr_type) {
1738	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1739		if ((__force u32)keys->addrs.v4addrs.dst <
1740		    (__force u32)keys->addrs.v4addrs.src)
 
 
 
 
1741			swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1742
1743		if ((__force u16)keys->ports.dst <
1744		    (__force u16)keys->ports.src) {
1745			swap(keys->ports.src, keys->ports.dst);
1746		}
1747		break;
1748	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1749		addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1750				   &keys->addrs.v6addrs.src,
1751				   sizeof(keys->addrs.v6addrs.dst));
1752		if (addr_diff < 0) {
 
 
 
1753			for (i = 0; i < 4; i++)
1754				swap(keys->addrs.v6addrs.src.s6_addr32[i],
1755				     keys->addrs.v6addrs.dst.s6_addr32[i]);
1756		}
1757		if ((__force u16)keys->ports.dst <
1758		    (__force u16)keys->ports.src) {
1759			swap(keys->ports.src, keys->ports.dst);
1760		}
1761		break;
1762	}
1763}
1764
1765static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1766					const siphash_key_t *keyval)
1767{
1768	u32 hash;
1769
1770	__flow_hash_consistentify(keys);
1771
1772	hash = siphash(flow_keys_hash_start(keys),
1773		       flow_keys_hash_length(keys), keyval);
1774	if (!hash)
1775		hash = 1;
1776
1777	return hash;
1778}
1779
1780u32 flow_hash_from_keys(struct flow_keys *keys)
1781{
1782	__flow_hash_secret_init();
1783	return __flow_hash_from_keys(keys, &hashrnd);
1784}
1785EXPORT_SYMBOL(flow_hash_from_keys);
1786
1787static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1788				  struct flow_keys *keys,
1789				  const siphash_key_t *keyval)
1790{
1791	skb_flow_dissect_flow_keys(skb, keys,
1792				   FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1793
1794	return __flow_hash_from_keys(keys, keyval);
1795}
1796
1797struct _flow_keys_digest_data {
1798	__be16	n_proto;
1799	u8	ip_proto;
1800	u8	padding;
1801	__be32	ports;
1802	__be32	src;
1803	__be32	dst;
1804};
1805
1806void make_flow_keys_digest(struct flow_keys_digest *digest,
1807			   const struct flow_keys *flow)
1808{
1809	struct _flow_keys_digest_data *data =
1810	    (struct _flow_keys_digest_data *)digest;
1811
1812	BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1813
1814	memset(digest, 0, sizeof(*digest));
1815
1816	data->n_proto = flow->basic.n_proto;
1817	data->ip_proto = flow->basic.ip_proto;
1818	data->ports = flow->ports.ports;
1819	data->src = flow->addrs.v4addrs.src;
1820	data->dst = flow->addrs.v4addrs.dst;
1821}
1822EXPORT_SYMBOL(make_flow_keys_digest);
1823
1824static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1825
1826u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1827{
1828	struct flow_keys keys;
1829
1830	__flow_hash_secret_init();
1831
1832	memset(&keys, 0, sizeof(keys));
1833	__skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1834			   &keys, NULL, 0, 0, 0, 0);
 
1835
1836	return __flow_hash_from_keys(&keys, &hashrnd);
1837}
1838EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1839
1840/**
1841 * __skb_get_hash: calculate a flow hash
1842 * @skb: sk_buff to calculate flow hash from
1843 *
1844 * This function calculates a flow hash based on src/dst addresses
1845 * and src/dst port numbers.  Sets hash in skb to non-zero hash value
1846 * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
1847 * if hash is a canonical 4-tuple hash over transport ports.
1848 */
1849void __skb_get_hash(struct sk_buff *skb)
1850{
1851	struct flow_keys keys;
1852	u32 hash;
1853
1854	__flow_hash_secret_init();
1855
1856	hash = ___skb_get_hash(skb, &keys, &hashrnd);
1857
1858	__skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1859}
1860EXPORT_SYMBOL(__skb_get_hash);
1861
1862__u32 skb_get_hash_perturb(const struct sk_buff *skb,
1863			   const siphash_key_t *perturb)
1864{
1865	struct flow_keys keys;
1866
1867	return ___skb_get_hash(skb, &keys, perturb);
1868}
1869EXPORT_SYMBOL(skb_get_hash_perturb);
1870
1871u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
1872		   const struct flow_keys_basic *keys, int hlen)
1873{
1874	u32 poff = keys->control.thoff;
1875
1876	/* skip L4 headers for fragments after the first */
1877	if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1878	    !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1879		return poff;
1880
1881	switch (keys->basic.ip_proto) {
1882	case IPPROTO_TCP: {
1883		/* access doff as u8 to avoid unaligned access */
1884		const u8 *doff;
1885		u8 _doff;
1886
1887		doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1888					    data, hlen, &_doff);
1889		if (!doff)
1890			return poff;
1891
1892		poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1893		break;
1894	}
1895	case IPPROTO_UDP:
1896	case IPPROTO_UDPLITE:
1897		poff += sizeof(struct udphdr);
1898		break;
1899	/* For the rest, we do not really care about header
1900	 * extensions at this point for now.
1901	 */
1902	case IPPROTO_ICMP:
1903		poff += sizeof(struct icmphdr);
1904		break;
1905	case IPPROTO_ICMPV6:
1906		poff += sizeof(struct icmp6hdr);
1907		break;
1908	case IPPROTO_IGMP:
1909		poff += sizeof(struct igmphdr);
1910		break;
1911	case IPPROTO_DCCP:
1912		poff += sizeof(struct dccp_hdr);
1913		break;
1914	case IPPROTO_SCTP:
1915		poff += sizeof(struct sctphdr);
1916		break;
1917	}
1918
1919	return poff;
1920}
1921
1922/**
1923 * skb_get_poff - get the offset to the payload
1924 * @skb: sk_buff to get the payload offset from
1925 *
1926 * The function will get the offset to the payload as far as it could
1927 * be dissected.  The main user is currently BPF, so that we can dynamically
1928 * truncate packets without needing to push actual payload to the user
1929 * space and can analyze headers only, instead.
1930 */
1931u32 skb_get_poff(const struct sk_buff *skb)
1932{
1933	struct flow_keys_basic keys;
1934
1935	if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1936					      NULL, 0, 0, 0, 0))
1937		return 0;
1938
1939	return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1940}
1941
1942__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1943{
1944	memset(keys, 0, sizeof(*keys));
1945
1946	memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1947	    sizeof(keys->addrs.v6addrs.src));
1948	memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1949	    sizeof(keys->addrs.v6addrs.dst));
1950	keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1951	keys->ports.src = fl6->fl6_sport;
1952	keys->ports.dst = fl6->fl6_dport;
1953	keys->keyid.keyid = fl6->fl6_gre_key;
1954	keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1955	keys->basic.ip_proto = fl6->flowi6_proto;
1956
1957	return flow_hash_from_keys(keys);
1958}
1959EXPORT_SYMBOL(__get_hash_from_flowi6);
1960
1961static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1962	{
1963		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
1964		.offset = offsetof(struct flow_keys, control),
1965	},
1966	{
1967		.key_id = FLOW_DISSECTOR_KEY_BASIC,
1968		.offset = offsetof(struct flow_keys, basic),
1969	},
1970	{
1971		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1972		.offset = offsetof(struct flow_keys, addrs.v4addrs),
1973	},
1974	{
1975		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1976		.offset = offsetof(struct flow_keys, addrs.v6addrs),
1977	},
1978	{
1979		.key_id = FLOW_DISSECTOR_KEY_TIPC,
1980		.offset = offsetof(struct flow_keys, addrs.tipckey),
1981	},
1982	{
1983		.key_id = FLOW_DISSECTOR_KEY_PORTS,
1984		.offset = offsetof(struct flow_keys, ports),
1985	},
1986	{
1987		.key_id = FLOW_DISSECTOR_KEY_VLAN,
1988		.offset = offsetof(struct flow_keys, vlan),
1989	},
1990	{
1991		.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1992		.offset = offsetof(struct flow_keys, tags),
1993	},
1994	{
1995		.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1996		.offset = offsetof(struct flow_keys, keyid),
1997	},
1998};
1999
2000static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
2001	{
2002		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
2003		.offset = offsetof(struct flow_keys, control),
2004	},
2005	{
2006		.key_id = FLOW_DISSECTOR_KEY_BASIC,
2007		.offset = offsetof(struct flow_keys, basic),
2008	},
2009	{
2010		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
2011		.offset = offsetof(struct flow_keys, addrs.v4addrs),
2012	},
2013	{
2014		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
2015		.offset = offsetof(struct flow_keys, addrs.v6addrs),
2016	},
2017	{
2018		.key_id = FLOW_DISSECTOR_KEY_PORTS,
2019		.offset = offsetof(struct flow_keys, ports),
2020	},
2021};
2022
2023static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
2024	{
2025		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
2026		.offset = offsetof(struct flow_keys, control),
2027	},
2028	{
2029		.key_id = FLOW_DISSECTOR_KEY_BASIC,
2030		.offset = offsetof(struct flow_keys, basic),
2031	},
2032};
2033
2034struct flow_dissector flow_keys_dissector __read_mostly;
2035EXPORT_SYMBOL(flow_keys_dissector);
2036
2037struct flow_dissector flow_keys_basic_dissector __read_mostly;
2038EXPORT_SYMBOL(flow_keys_basic_dissector);
2039
2040static int __init init_default_flow_dissectors(void)
2041{
2042	skb_flow_dissector_init(&flow_keys_dissector,
2043				flow_keys_dissector_keys,
2044				ARRAY_SIZE(flow_keys_dissector_keys));
2045	skb_flow_dissector_init(&flow_keys_dissector_symmetric,
2046				flow_keys_dissector_symmetric_keys,
2047				ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
2048	skb_flow_dissector_init(&flow_keys_basic_dissector,
2049				flow_keys_basic_dissector_keys,
2050				ARRAY_SIZE(flow_keys_basic_dissector_keys));
2051	return 0;
2052}
 
2053core_initcall(init_default_flow_dissectors);