include/net/pkt_cls.h

   1 #ifndef __NET_PKT_CLS_H
   2 #define __NET_PKT_CLS_H
   3
   4 #include <linux/pkt_cls.h>
   5 #include <net/sch_generic.h>
   6 #include <net/act_api.h>
   7
   8 /* Basic packet classifier frontend definitions. */
   9
  10 struct tcf_walker {
  11         int     stop;
  12         int     skip;
  13         int     count;
  14         int     (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
  15 };
  16
  17 int register_tcf_proto_ops(struct tcf_proto_ops *ops);
  18 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
  19
  20 static inline unsigned long
  21 __cls_set_class(unsigned long *clp, unsigned long cl)
  22 {
  23         return xchg(clp, cl);
  24 }
  25
  26 static inline unsigned long
  27 cls_set_class(struct tcf_proto *tp, unsigned long *clp,
  28         unsigned long cl)
  29 {
  30         unsigned long old_cl;
  31
  32         tcf_tree_lock(tp);
  33         old_cl = __cls_set_class(clp, cl);
  34         tcf_tree_unlock(tp);
  35
  36         return old_cl;
  37 }
  38
  39 static inline void
  40 tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
  41 {
  42         unsigned long cl;
  43
  44         cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
  45         cl = cls_set_class(tp, &r->class, cl);
  46         if (cl)
  47                 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
  48 }
  49
  50 static inline void
  51 tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
  52 {
  53         unsigned long cl;
  54
  55         if ((cl = __cls_set_class(&r->class, 0)) != 0)
  56                 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
  57 }
  58
  59 struct tcf_exts {
  60 #ifdef CONFIG_NET_CLS_ACT
  61         __u32   type; /* for backward compat(TCA_OLD_COMPAT) */
  62         int nr_actions;
  63         struct tc_action **actions;
  64 #endif
  65         /* Map to export classifier specific extension TLV types to the
  66          * generic extensions API. Unsupported extensions must be set to 0.
  67          */
  68         int action;
  69         int police;
  70 };
  71
  72 static inline void tcf_exts_init(struct tcf_exts *exts, int action, int police)
  73 {
  74 #ifdef CONFIG_NET_CLS_ACT
  75         exts->type = 0;
  76         exts->nr_actions = 0;
  77         exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
  78                                 GFP_KERNEL);
  79         WARN_ON(!exts->actions); /* TODO: propagate the error to callers */
  80 #endif
  81         exts->action = action;
  82         exts->police = police;
  83 }
  84
  85 /**
  86  * tcf_exts_is_predicative - check if a predicative extension is present
  87  * @exts: tc filter extensions handle
  88  *
  89  * Returns 1 if a predicative extension is present, i.e. an extension which
  90  * might cause further actions and thus overrule the regular tcf_result.
  91  */
  92 static inline int
  93 tcf_exts_is_predicative(struct tcf_exts *exts)
  94 {
  95 #ifdef CONFIG_NET_CLS_ACT
  96         return exts->nr_actions;
  97 #else
  98         return 0;
  99 #endif
 100 }
 101
 102 /**
 103  * tcf_exts_is_available - check if at least one extension is present
 104  * @exts: tc filter extensions handle
 105  *
 106  * Returns 1 if at least one extension is present.
 107  */
 108 static inline int
 109 tcf_exts_is_available(struct tcf_exts *exts)
 110 {
 111         /* All non-predicative extensions must be added here. */
 112         return tcf_exts_is_predicative(exts);
 113 }
 114
 115 static inline void tcf_exts_to_list(const struct tcf_exts *exts,
 116                                     struct list_head *actions)
 117 {
 118 #ifdef CONFIG_NET_CLS_ACT
 119         int i;
 120
 121         for (i = 0; i < exts->nr_actions; i++) {
 122                 struct tc_action *a = exts->actions[i];
 123
 124                 list_add(&a->list, actions);
 125         }
 126 #endif
 127 }
 128
 129 /**
 130  * tcf_exts_exec - execute tc filter extensions
 131  * @skb: socket buffer
 132  * @exts: tc filter extensions handle
 133  * @res: desired result
 134  *
 135  * Executes all configured extensions. Returns 0 on a normal execution,
 136  * a negative number if the filter must be considered unmatched or
 137  * a positive action code (TC_ACT_*) which must be returned to the
 138  * underlying layer.
 139  */
 140 static inline int
 141 tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
 142                struct tcf_result *res)
 143 {
 144 #ifdef CONFIG_NET_CLS_ACT
 145         if (exts->nr_actions)
 146                 return tcf_action_exec(skb, exts->actions, exts->nr_actions,
 147                                        res);
 148 #endif
 149         return 0;
 150 }
 151
 152 #ifdef CONFIG_NET_CLS_ACT
 153
 154 #define tc_no_actions(_exts)  ((_exts)->nr_actions == 0)
 155 #define tc_single_action(_exts) ((_exts)->nr_actions == 1)
 156
 157 #else /* CONFIG_NET_CLS_ACT */
 158
 159 #define tc_no_actions(_exts) true
 160 #define tc_single_action(_exts) false
 161
 162 #endif /* CONFIG_NET_CLS_ACT */
 163
 164 int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
 165                       struct nlattr **tb, struct nlattr *rate_tlv,
 166                       struct tcf_exts *exts, bool ovr);
 167 void tcf_exts_destroy(struct tcf_exts *exts);
 168 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
 169                      struct tcf_exts *src);
 170 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
 171 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts);
 172
 173 /**
 174  * struct tcf_pkt_info - packet information
 175  */
 176 struct tcf_pkt_info {
 177         unsigned char *         ptr;
 178         int                     nexthdr;
 179 };
 180
 181 #ifdef CONFIG_NET_EMATCH
 182
 183 struct tcf_ematch_ops;
 184
 185 /**
 186  * struct tcf_ematch - extended match (ematch)
 187  *
 188  * @matchid: identifier to allow userspace to reidentify a match
 189  * @flags: flags specifying attributes and the relation to other matches
 190  * @ops: the operations lookup table of the corresponding ematch module
 191  * @datalen: length of the ematch specific configuration data
 192  * @data: ematch specific data
 193  */
 194 struct tcf_ematch {
 195         struct tcf_ematch_ops * ops;
 196         unsigned long           data;
 197         unsigned int            datalen;
 198         u16                     matchid;
 199         u16                     flags;
 200         struct net              *net;
 201 };
 202
 203 static inline int tcf_em_is_container(struct tcf_ematch *em)
 204 {
 205         return !em->ops;
 206 }
 207
 208 static inline int tcf_em_is_simple(struct tcf_ematch *em)
 209 {
 210         return em->flags & TCF_EM_SIMPLE;
 211 }
 212
 213 static inline int tcf_em_is_inverted(struct tcf_ematch *em)
 214 {
 215         return em->flags & TCF_EM_INVERT;
 216 }
 217
 218 static inline int tcf_em_last_match(struct tcf_ematch *em)
 219 {
 220         return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
 221 }
 222
 223 static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
 224 {
 225         if (tcf_em_last_match(em))
 226                 return 1;
 227
 228         if (result == 0 && em->flags & TCF_EM_REL_AND)
 229                 return 1;
 230
 231         if (result != 0 && em->flags & TCF_EM_REL_OR)
 232                 return 1;
 233
 234         return 0;
 235 }
 236
 237 /**
 238  * struct tcf_ematch_tree - ematch tree handle
 239  *
 240  * @hdr: ematch tree header supplied by userspace
 241  * @matches: array of ematches
 242  */
 243 struct tcf_ematch_tree {
 244         struct tcf_ematch_tree_hdr hdr;
 245         struct tcf_ematch *     matches;
 246
 247 };
 248
 249 /**
 250  * struct tcf_ematch_ops - ematch module operations
 251  *
 252  * @kind: identifier (kind) of this ematch module
 253  * @datalen: length of expected configuration data (optional)
 254  * @change: called during validation (optional)
 255  * @match: called during ematch tree evaluation, must return 1/0
 256  * @destroy: called during destroyage (optional)
 257  * @dump: called during dumping process (optional)
 258  * @owner: owner, must be set to THIS_MODULE
 259  * @link: link to previous/next ematch module (internal use)
 260  */
 261 struct tcf_ematch_ops {
 262         int                     kind;
 263         int                     datalen;
 264         int                     (*change)(struct net *net, void *,
 265                                           int, struct tcf_ematch *);
 266         int                     (*match)(struct sk_buff *, struct tcf_ematch *,
 267                                          struct tcf_pkt_info *);
 268         void                    (*destroy)(struct tcf_ematch *);
 269         int                     (*dump)(struct sk_buff *, struct tcf_ematch *);
 270         struct module           *owner;
 271         struct list_head        link;
 272 };
 273
 274 int tcf_em_register(struct tcf_ematch_ops *);
 275 void tcf_em_unregister(struct tcf_ematch_ops *);
 276 int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
 277                          struct tcf_ematch_tree *);
 278 void tcf_em_tree_destroy(struct tcf_ematch_tree *);
 279 int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
 280 int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
 281                         struct tcf_pkt_info *);
 282
 283 /**
 284  * tcf_em_tree_change - replace ematch tree of a running classifier
 285  *
 286  * @tp: classifier kind handle
 287  * @dst: destination ematch tree variable
 288  * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
 289  *
 290  * This functions replaces the ematch tree in @dst with the ematch
 291  * tree in @src. The classifier in charge of the ematch tree may be
 292  * running.
 293  */
 294 static inline void tcf_em_tree_change(struct tcf_proto *tp,
 295                                       struct tcf_ematch_tree *dst,
 296                                       struct tcf_ematch_tree *src)
 297 {
 298         tcf_tree_lock(tp);
 299         memcpy(dst, src, sizeof(*dst));
 300         tcf_tree_unlock(tp);
 301 }
 302
 303 /**
 304  * tcf_em_tree_match - evaulate an ematch tree
 305  *
 306  * @skb: socket buffer of the packet in question
 307  * @tree: ematch tree to be used for evaluation
 308  * @info: packet information examined by classifier
 309  *
 310  * This function matches @skb against the ematch tree in @tree by going
 311  * through all ematches respecting their logic relations returning
 312  * as soon as the result is obvious.
 313  *
 314  * Returns 1 if the ematch tree as-one matches, no ematches are configured
 315  * or ematch is not enabled in the kernel, otherwise 0 is returned.
 316  */
 317 static inline int tcf_em_tree_match(struct sk_buff *skb,
 318                                     struct tcf_ematch_tree *tree,
 319                                     struct tcf_pkt_info *info)
 320 {
 321         if (tree->hdr.nmatches)
 322                 return __tcf_em_tree_match(skb, tree, info);
 323         else
 324                 return 1;
 325 }
 326
 327 #define MODULE_ALIAS_TCF_EMATCH(kind)   MODULE_ALIAS("ematch-kind-" __stringify(kind))
 328
 329 #else /* CONFIG_NET_EMATCH */
 330
 331 struct tcf_ematch_tree {
 332 };
 333
 334 #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
 335 #define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
 336 #define tcf_em_tree_dump(skb, t, tlv) (0)
 337 #define tcf_em_tree_change(tp, dst, src) do { } while(0)
 338 #define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
 339
 340 #endif /* CONFIG_NET_EMATCH */
 341
 342 static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
 343 {
 344         switch (layer) {
 345                 case TCF_LAYER_LINK:
 346                         return skb->data;
 347                 case TCF_LAYER_NETWORK:
 348                         return skb_network_header(skb);
 349                 case TCF_LAYER_TRANSPORT:
 350                         return skb_transport_header(skb);
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static inline int tcf_valid_offset(const struct sk_buff *skb,
 357                                    const unsigned char *ptr, const int len)
 358 {
 359         return likely((ptr + len) <= skb_tail_pointer(skb) &&
 360                       ptr >= skb->head &&
 361                       (ptr <= (ptr + len)));
 362 }
 363
 364 #ifdef CONFIG_NET_CLS_IND
 365 #include <net/net_namespace.h>
 366
 367 static inline int
 368 tcf_change_indev(struct net *net, struct nlattr *indev_tlv)
 369 {
 370         char indev[IFNAMSIZ];
 371         struct net_device *dev;
 372
 373         if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
 374                 return -EINVAL;
 375         dev = __dev_get_by_name(net, indev);
 376         if (!dev)
 377                 return -ENODEV;
 378         return dev->ifindex;
 379 }
 380
 381 static inline bool
 382 tcf_match_indev(struct sk_buff *skb, int ifindex)
 383 {
 384         if (!ifindex)
 385                 return true;
 386         if  (!skb->skb_iif)
 387                 return false;
 388         return ifindex == skb->skb_iif;
 389 }
 390 #endif /* CONFIG_NET_CLS_IND */
 391
 392 struct tc_cls_u32_knode {
 393         struct tcf_exts *exts;
 394         struct tc_u32_sel *sel;
 395         u32 handle;
 396         u32 val;
 397         u32 mask;
 398         u32 link_handle;
 399         u8 fshift;
 400 };
 401
 402 struct tc_cls_u32_hnode {
 403         u32 handle;
 404         u32 prio;
 405         unsigned int divisor;
 406 };
 407
 408 enum tc_clsu32_command {
 409         TC_CLSU32_NEW_KNODE,
 410         TC_CLSU32_REPLACE_KNODE,
 411         TC_CLSU32_DELETE_KNODE,
 412         TC_CLSU32_NEW_HNODE,
 413         TC_CLSU32_REPLACE_HNODE,
 414         TC_CLSU32_DELETE_HNODE,
 415 };
 416
 417 struct tc_cls_u32_offload {
 418         /* knode values */
 419         enum tc_clsu32_command command;
 420         union {
 421                 struct tc_cls_u32_knode knode;
 422                 struct tc_cls_u32_hnode hnode;
 423         };
 424 };
 425
 426 static inline bool tc_should_offload(const struct net_device *dev,
 427                                      const struct tcf_proto *tp, u32 flags)
 428 {
 429         const struct Qdisc *sch = tp->q;
 430         const struct Qdisc_class_ops *cops = sch->ops->cl_ops;
 431
 432         if (!(dev->features & NETIF_F_HW_TC))
 433                 return false;
 434         if (flags & TCA_CLS_FLAGS_SKIP_HW)
 435                 return false;
 436         if (!dev->netdev_ops->ndo_setup_tc)
 437                 return false;
 438         if (cops && cops->tcf_cl_offload)
 439                 return cops->tcf_cl_offload(tp->classid);
 440
 441         return true;
 442 }
 443
 444 static inline bool tc_skip_sw(u32 flags)
 445 {
 446         return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
 447 }
 448
 449 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
 450 static inline bool tc_flags_valid(u32 flags)
 451 {
 452         if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))
 453                 return false;
 454
 455         if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)))
 456                 return false;
 457
 458         return true;
 459 }
 460
 461 enum tc_fl_command {
 462         TC_CLSFLOWER_REPLACE,
 463         TC_CLSFLOWER_DESTROY,
 464         TC_CLSFLOWER_STATS,
 465 };
 466
 467 struct tc_cls_flower_offload {
 468         enum tc_fl_command command;
 469         unsigned long cookie;
 470         struct flow_dissector *dissector;
 471         struct fl_flow_key *mask;
 472         struct fl_flow_key *key;
 473         struct tcf_exts *exts;
 474 };
 475
 476 enum tc_matchall_command {
 477         TC_CLSMATCHALL_REPLACE,
 478         TC_CLSMATCHALL_DESTROY,
 479 };
 480
 481 struct tc_cls_matchall_offload {
 482         enum tc_matchall_command command;
 483         struct tcf_exts *exts;
 484         unsigned long cookie;
 485 };
 486
 487 #endif