11da177e4SLinus Torvalds #ifndef __NET_PKT_CLS_H 21da177e4SLinus Torvalds #define __NET_PKT_CLS_H 31da177e4SLinus Torvalds 41da177e4SLinus Torvalds #include <linux/pkt_cls.h> 51da177e4SLinus Torvalds #include <net/sch_generic.h> 61da177e4SLinus Torvalds #include <net/act_api.h> 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds /* Basic packet classifier frontend definitions. */ 91da177e4SLinus Torvalds 10fd2c3ef7SEric Dumazet struct tcf_walker { 111da177e4SLinus Torvalds int stop; 121da177e4SLinus Torvalds int skip; 131da177e4SLinus Torvalds int count; 141da177e4SLinus Torvalds int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); 151da177e4SLinus Torvalds }; 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); 181da177e4SLinus Torvalds extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds static inline unsigned long 211da177e4SLinus Torvalds __cls_set_class(unsigned long *clp, unsigned long cl) 221da177e4SLinus Torvalds { 231da177e4SLinus Torvalds unsigned long old_cl; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds old_cl = *clp; 261da177e4SLinus Torvalds *clp = cl; 271da177e4SLinus Torvalds return old_cl; 281da177e4SLinus Torvalds } 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds static inline unsigned long 311da177e4SLinus Torvalds cls_set_class(struct tcf_proto *tp, unsigned long *clp, 321da177e4SLinus Torvalds unsigned long cl) 331da177e4SLinus Torvalds { 341da177e4SLinus Torvalds unsigned long old_cl; 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds tcf_tree_lock(tp); 371da177e4SLinus Torvalds old_cl = __cls_set_class(clp, cl); 381da177e4SLinus Torvalds tcf_tree_unlock(tp); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds return old_cl; 411da177e4SLinus Torvalds } 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds static inline void 441da177e4SLinus Torvalds tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) 451da177e4SLinus Torvalds { 461da177e4SLinus Torvalds unsigned long cl; 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); 491da177e4SLinus Torvalds cl = cls_set_class(tp, &r->class, cl); 501da177e4SLinus Torvalds if (cl) 511da177e4SLinus Torvalds tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static inline void 551da177e4SLinus Torvalds tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds unsigned long cl; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds if ((cl = __cls_set_class(&r->class, 0)) != 0) 601da177e4SLinus Torvalds tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 63fd2c3ef7SEric Dumazet struct tcf_exts { 641da177e4SLinus Torvalds #ifdef CONFIG_NET_CLS_ACT 651da177e4SLinus Torvalds struct tc_action *action; 661da177e4SLinus Torvalds #endif 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds /* Map to export classifier specific extension TLV types to the 701da177e4SLinus Torvalds * generic extensions API. Unsupported extensions must be set to 0. 711da177e4SLinus Torvalds */ 72fd2c3ef7SEric Dumazet struct tcf_ext_map { 731da177e4SLinus Torvalds int action; 741da177e4SLinus Torvalds int police; 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds /** 781da177e4SLinus Torvalds * tcf_exts_is_predicative - check if a predicative extension is present 791da177e4SLinus Torvalds * @exts: tc filter extensions handle 801da177e4SLinus Torvalds * 811da177e4SLinus Torvalds * Returns 1 if a predicative extension is present, i.e. an extension which 821da177e4SLinus Torvalds * might cause further actions and thus overrule the regular tcf_result. 831da177e4SLinus Torvalds */ 841da177e4SLinus Torvalds static inline int 851da177e4SLinus Torvalds tcf_exts_is_predicative(struct tcf_exts *exts) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds #ifdef CONFIG_NET_CLS_ACT 881da177e4SLinus Torvalds return !!exts->action; 891da177e4SLinus Torvalds #else 901da177e4SLinus Torvalds return 0; 911da177e4SLinus Torvalds #endif 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /** 951da177e4SLinus Torvalds * tcf_exts_is_available - check if at least one extension is present 961da177e4SLinus Torvalds * @exts: tc filter extensions handle 971da177e4SLinus Torvalds * 981da177e4SLinus Torvalds * Returns 1 if at least one extension is present. 991da177e4SLinus Torvalds */ 1001da177e4SLinus Torvalds static inline int 1011da177e4SLinus Torvalds tcf_exts_is_available(struct tcf_exts *exts) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds /* All non-predicative extensions must be added here. */ 1041da177e4SLinus Torvalds return tcf_exts_is_predicative(exts); 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /** 1081da177e4SLinus Torvalds * tcf_exts_exec - execute tc filter extensions 1091da177e4SLinus Torvalds * @skb: socket buffer 1101da177e4SLinus Torvalds * @exts: tc filter extensions handle 1111da177e4SLinus Torvalds * @res: desired result 1121da177e4SLinus Torvalds * 1131da177e4SLinus Torvalds * Executes all configured extensions. Returns 0 on a normal execution, 1141da177e4SLinus Torvalds * a negative number if the filter must be considered unmatched or 1151da177e4SLinus Torvalds * a positive action code (TC_ACT_*) which must be returned to the 1161da177e4SLinus Torvalds * underlying layer. 1171da177e4SLinus Torvalds */ 1181da177e4SLinus Torvalds static inline int 1191da177e4SLinus Torvalds tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, 1201da177e4SLinus Torvalds struct tcf_result *res) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds #ifdef CONFIG_NET_CLS_ACT 1231da177e4SLinus Torvalds if (exts->action) 1241da177e4SLinus Torvalds return tcf_action_exec(skb, exts->action, res); 1251da177e4SLinus Torvalds #endif 1261da177e4SLinus Torvalds return 0; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129add93b61SPatrick McHardy extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, 130add93b61SPatrick McHardy struct nlattr *rate_tlv, struct tcf_exts *exts, 1315239008bSPatrick McHardy const struct tcf_ext_map *map); 1321da177e4SLinus Torvalds extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); 1331da177e4SLinus Torvalds extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, 1341da177e4SLinus Torvalds struct tcf_exts *src); 1351da177e4SLinus Torvalds extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, 1365239008bSPatrick McHardy const struct tcf_ext_map *map); 1371da177e4SLinus Torvalds extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, 1385239008bSPatrick McHardy const struct tcf_ext_map *map); 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /** 1411da177e4SLinus Torvalds * struct tcf_pkt_info - packet information 1421da177e4SLinus Torvalds */ 143fd2c3ef7SEric Dumazet struct tcf_pkt_info { 1441da177e4SLinus Torvalds unsigned char * ptr; 1451da177e4SLinus Torvalds int nexthdr; 1461da177e4SLinus Torvalds }; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds #ifdef CONFIG_NET_EMATCH 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds struct tcf_ematch_ops; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /** 1531da177e4SLinus Torvalds * struct tcf_ematch - extended match (ematch) 1541da177e4SLinus Torvalds * 1551da177e4SLinus Torvalds * @matchid: identifier to allow userspace to reidentify a match 1561da177e4SLinus Torvalds * @flags: flags specifying attributes and the relation to other matches 1571da177e4SLinus Torvalds * @ops: the operations lookup table of the corresponding ematch module 1581da177e4SLinus Torvalds * @datalen: length of the ematch specific configuration data 1591da177e4SLinus Torvalds * @data: ematch specific data 1601da177e4SLinus Torvalds */ 161fd2c3ef7SEric Dumazet struct tcf_ematch { 1621da177e4SLinus Torvalds struct tcf_ematch_ops * ops; 1631da177e4SLinus Torvalds unsigned long data; 1641da177e4SLinus Torvalds unsigned int datalen; 1651da177e4SLinus Torvalds u16 matchid; 1661da177e4SLinus Torvalds u16 flags; 1671da177e4SLinus Torvalds }; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static inline int tcf_em_is_container(struct tcf_ematch *em) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds return !em->ops; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds static inline int tcf_em_is_simple(struct tcf_ematch *em) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds return em->flags & TCF_EM_SIMPLE; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds static inline int tcf_em_is_inverted(struct tcf_ematch *em) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds return em->flags & TCF_EM_INVERT; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds static inline int tcf_em_last_match(struct tcf_ematch *em) 1851da177e4SLinus Torvalds { 1861da177e4SLinus Torvalds return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds static inline int tcf_em_early_end(struct tcf_ematch *em, int result) 1901da177e4SLinus Torvalds { 1911da177e4SLinus Torvalds if (tcf_em_last_match(em)) 1921da177e4SLinus Torvalds return 1; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds if (result == 0 && em->flags & TCF_EM_REL_AND) 1951da177e4SLinus Torvalds return 1; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds if (result != 0 && em->flags & TCF_EM_REL_OR) 1981da177e4SLinus Torvalds return 1; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds return 0; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /** 2041da177e4SLinus Torvalds * struct tcf_ematch_tree - ematch tree handle 2051da177e4SLinus Torvalds * 2061da177e4SLinus Torvalds * @hdr: ematch tree header supplied by userspace 2071da177e4SLinus Torvalds * @matches: array of ematches 2081da177e4SLinus Torvalds */ 209fd2c3ef7SEric Dumazet struct tcf_ematch_tree { 2101da177e4SLinus Torvalds struct tcf_ematch_tree_hdr hdr; 2111da177e4SLinus Torvalds struct tcf_ematch * matches; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds }; 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /** 2161da177e4SLinus Torvalds * struct tcf_ematch_ops - ematch module operations 2171da177e4SLinus Torvalds * 2181da177e4SLinus Torvalds * @kind: identifier (kind) of this ematch module 2191da177e4SLinus Torvalds * @datalen: length of expected configuration data (optional) 2201da177e4SLinus Torvalds * @change: called during validation (optional) 2211da177e4SLinus Torvalds * @match: called during ematch tree evaluation, must return 1/0 2221da177e4SLinus Torvalds * @destroy: called during destroyage (optional) 2231da177e4SLinus Torvalds * @dump: called during dumping process (optional) 2241da177e4SLinus Torvalds * @owner: owner, must be set to THIS_MODULE 2251da177e4SLinus Torvalds * @link: link to previous/next ematch module (internal use) 2261da177e4SLinus Torvalds */ 227fd2c3ef7SEric Dumazet struct tcf_ematch_ops { 2281da177e4SLinus Torvalds int kind; 2291da177e4SLinus Torvalds int datalen; 2301da177e4SLinus Torvalds int (*change)(struct tcf_proto *, void *, 2311da177e4SLinus Torvalds int, struct tcf_ematch *); 2321da177e4SLinus Torvalds int (*match)(struct sk_buff *, struct tcf_ematch *, 2331da177e4SLinus Torvalds struct tcf_pkt_info *); 2341da177e4SLinus Torvalds void (*destroy)(struct tcf_proto *, 2351da177e4SLinus Torvalds struct tcf_ematch *); 2361da177e4SLinus Torvalds int (*dump)(struct sk_buff *, struct tcf_ematch *); 2371da177e4SLinus Torvalds struct module *owner; 2381da177e4SLinus Torvalds struct list_head link; 2391da177e4SLinus Torvalds }; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds extern int tcf_em_register(struct tcf_ematch_ops *); 2424d24b52aSAlexey Dobriyan extern void tcf_em_unregister(struct tcf_ematch_ops *); 243add93b61SPatrick McHardy extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, 2441da177e4SLinus Torvalds struct tcf_ematch_tree *); 2451da177e4SLinus Torvalds extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); 2461da177e4SLinus Torvalds extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); 2471da177e4SLinus Torvalds extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, 2481da177e4SLinus Torvalds struct tcf_pkt_info *); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds /** 2511da177e4SLinus Torvalds * tcf_em_tree_change - replace ematch tree of a running classifier 2521da177e4SLinus Torvalds * 2531da177e4SLinus Torvalds * @tp: classifier kind handle 2541da177e4SLinus Torvalds * @dst: destination ematch tree variable 2551da177e4SLinus Torvalds * @src: source ematch tree (temporary tree from tcf_em_tree_validate) 2561da177e4SLinus Torvalds * 2571da177e4SLinus Torvalds * This functions replaces the ematch tree in @dst with the ematch 2581da177e4SLinus Torvalds * tree in @src. The classifier in charge of the ematch tree may be 2591da177e4SLinus Torvalds * running. 2601da177e4SLinus Torvalds */ 2611da177e4SLinus Torvalds static inline void tcf_em_tree_change(struct tcf_proto *tp, 2621da177e4SLinus Torvalds struct tcf_ematch_tree *dst, 2631da177e4SLinus Torvalds struct tcf_ematch_tree *src) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds tcf_tree_lock(tp); 2661da177e4SLinus Torvalds memcpy(dst, src, sizeof(*dst)); 2671da177e4SLinus Torvalds tcf_tree_unlock(tp); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds /** 2711da177e4SLinus Torvalds * tcf_em_tree_match - evaulate an ematch tree 2721da177e4SLinus Torvalds * 2731da177e4SLinus Torvalds * @skb: socket buffer of the packet in question 2741da177e4SLinus Torvalds * @tree: ematch tree to be used for evaluation 2751da177e4SLinus Torvalds * @info: packet information examined by classifier 2761da177e4SLinus Torvalds * 2771da177e4SLinus Torvalds * This function matches @skb against the ematch tree in @tree by going 2781da177e4SLinus Torvalds * through all ematches respecting their logic relations returning 2791da177e4SLinus Torvalds * as soon as the result is obvious. 2801da177e4SLinus Torvalds * 2811da177e4SLinus Torvalds * Returns 1 if the ematch tree as-one matches, no ematches are configured 2821da177e4SLinus Torvalds * or ematch is not enabled in the kernel, otherwise 0 is returned. 2831da177e4SLinus Torvalds */ 2841da177e4SLinus Torvalds static inline int tcf_em_tree_match(struct sk_buff *skb, 2851da177e4SLinus Torvalds struct tcf_ematch_tree *tree, 2861da177e4SLinus Torvalds struct tcf_pkt_info *info) 2871da177e4SLinus Torvalds { 2881da177e4SLinus Torvalds if (tree->hdr.nmatches) 2891da177e4SLinus Torvalds return __tcf_em_tree_match(skb, tree, info); 2901da177e4SLinus Torvalds else 2911da177e4SLinus Torvalds return 1; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 294db3d99c0SPatrick McHardy #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) 295db3d99c0SPatrick McHardy 2961da177e4SLinus Torvalds #else /* CONFIG_NET_EMATCH */ 2971da177e4SLinus Torvalds 298fd2c3ef7SEric Dumazet struct tcf_ematch_tree { 2991da177e4SLinus Torvalds }; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) 3021da177e4SLinus Torvalds #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) 3031da177e4SLinus Torvalds #define tcf_em_tree_dump(skb, t, tlv) (0) 3041da177e4SLinus Torvalds #define tcf_em_tree_change(tp, dst, src) do { } while(0) 3051da177e4SLinus Torvalds #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds #endif /* CONFIG_NET_EMATCH */ 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds switch (layer) { 3121da177e4SLinus Torvalds case TCF_LAYER_LINK: 3131da177e4SLinus Torvalds return skb->data; 3141da177e4SLinus Torvalds case TCF_LAYER_NETWORK: 315d56f90a7SArnaldo Carvalho de Melo return skb_network_header(skb); 3161da177e4SLinus Torvalds case TCF_LAYER_TRANSPORT: 3179c70220bSArnaldo Carvalho de Melo return skb_transport_header(skb); 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds return NULL; 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds 323eddc9ec5SArnaldo Carvalho de Melo static inline int tcf_valid_offset(const struct sk_buff *skb, 324eddc9ec5SArnaldo Carvalho de Melo const unsigned char *ptr, const int len) 3251da177e4SLinus Torvalds { 32627a884dcSArnaldo Carvalho de Melo return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head); 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds #ifdef CONFIG_NET_CLS_IND 3300eeb8ffcSDenis V. Lunev #include <net/net_namespace.h> 3310eeb8ffcSDenis V. Lunev 3321da177e4SLinus Torvalds static inline int 333add93b61SPatrick McHardy tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) 3341da177e4SLinus Torvalds { 335add93b61SPatrick McHardy if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) 3361da177e4SLinus Torvalds return -EINVAL; 3371da177e4SLinus Torvalds return 0; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds static inline int 3411da177e4SLinus Torvalds tcf_match_indev(struct sk_buff *skb, char *indev) 3421da177e4SLinus Torvalds { 343c01003c2SPatrick McHardy struct net_device *dev; 344c01003c2SPatrick McHardy 34586e65da9SDavid S. Miller if (indev[0]) { 3468964be4aSEric Dumazet if (!skb->skb_iif) 3471da177e4SLinus Torvalds return 0; 3488964be4aSEric Dumazet dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif); 349c01003c2SPatrick McHardy if (!dev || strcmp(indev, dev->name)) 3501da177e4SLinus Torvalds return 0; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds return 1; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds #endif /* CONFIG_NET_CLS_IND */ 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds #endif 358