1 files changed, 366 insertions, 0 deletions

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
new file mode 100644
index 000000000000..4abda6aec05a
--- /dev/null
+++ b/include/net/pkt_cls.h
@@ -0,0 +1,366 @@
+#ifndef __NET_PKT_CLS_H
+#define __NET_PKT_CLS_H
+
+#include <linux/pkt_cls.h>
+#include <net/sch_generic.h>
+#include <net/act_api.h>
+
+/* Basic packet classifier frontend definitions. */
+
+struct tcf_walker
+{
+        int     stop;
+        int     skip;
+        int     count;
+        int     (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
+};
+
+extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
+extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
+
+static inline unsigned long
+__cls_set_class(unsigned long *clp, unsigned long cl)
+{
+        unsigned long old_cl;
+ 
+        old_cl = *clp;
+        *clp = cl;
+        return old_cl;
+}
+
+static inline unsigned long
+cls_set_class(struct tcf_proto *tp, unsigned long *clp, 
+        unsigned long cl)
+{
+        unsigned long old_cl;
+        
+        tcf_tree_lock(tp);
+        old_cl = __cls_set_class(clp, cl);
+        tcf_tree_unlock(tp);
+ 
+        return old_cl;
+}
+
+static inline void
+tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
+{
+        unsigned long cl;
+
+        cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
+        cl = cls_set_class(tp, &r->class, cl);
+        if (cl)
+                tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
+}
+
+static inline void
+tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
+{
+        unsigned long cl;
+
+        if ((cl = __cls_set_class(&r->class, 0)) != 0)
+                tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
+}
+
+struct tcf_exts
+{
+#ifdef CONFIG_NET_CLS_ACT
+        struct tc_action *action;
+#elif defined CONFIG_NET_CLS_POLICE
+        struct tcf_police *police;
+#endif
+};
+
+/* Map to export classifier specific extension TLV types to the
+ * generic extensions API. Unsupported extensions must be set to 0.
+ */
+struct tcf_ext_map
+{
+        int action;
+        int police;
+};
+
+/**
+ * tcf_exts_is_predicative - check if a predicative extension is present
+ * @exts: tc filter extensions handle
+ *
+ * Returns 1 if a predicative extension is present, i.e. an extension which
+ * might cause further actions and thus overrule the regular tcf_result.
+ */
+static inline int
+tcf_exts_is_predicative(struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        return !!exts->action;
+#elif defined CONFIG_NET_CLS_POLICE
+        return !!exts->police;
+#else
+        return 0;
+#endif
+}
+
+/**
+ * tcf_exts_is_available - check if at least one extension is present
+ * @exts: tc filter extensions handle
+ *
+ * Returns 1 if at least one extension is present.
+ */
+static inline int
+tcf_exts_is_available(struct tcf_exts *exts)
+{
+        /* All non-predicative extensions must be added here. */
+        return tcf_exts_is_predicative(exts);
+}
+
+/**
+ * tcf_exts_exec - execute tc filter extensions
+ * @skb: socket buffer
+ * @exts: tc filter extensions handle
+ * @res: desired result
+ *
+ * Executes all configured extensions. Returns 0 on a normal execution,
+ * a negative number if the filter must be considered unmatched or
+ * a positive action code (TC_ACT_*) which must be returned to the
+ * underlying layer.
+ */
+static inline int
+tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
+               struct tcf_result *res)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        if (exts->action)
+                return tcf_action_exec(skb, exts->action, res);
+#elif defined CONFIG_NET_CLS_POLICE
+        if (exts->police)
+                return tcf_police(skb, exts->police);
+#endif
+
+        return 0;
+}
+
+extern int tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb,
+                             struct rtattr *rate_tlv, struct tcf_exts *exts,
+                             struct tcf_ext_map *map);
+extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts);
+extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
+                             struct tcf_exts *src);
+extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
+                         struct tcf_ext_map *map);
+extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
+                               struct tcf_ext_map *map);
+
+/**
+ * struct tcf_pkt_info - packet information
+ */
+struct tcf_pkt_info
+{
+        unsigned char *         ptr;
+        int                     nexthdr;
+};
+
+#ifdef CONFIG_NET_EMATCH
+
+struct tcf_ematch_ops;
+
+/**
+ * struct tcf_ematch - extended match (ematch)
+ * 
+ * @matchid: identifier to allow userspace to reidentify a match
+ * @flags: flags specifying attributes and the relation to other matches
+ * @ops: the operations lookup table of the corresponding ematch module
+ * @datalen: length of the ematch specific configuration data
+ * @data: ematch specific data
+ */
+struct tcf_ematch
+{
+        struct tcf_ematch_ops * ops;
+        unsigned long           data;
+        unsigned int            datalen;
+        u16                     matchid;
+        u16                     flags;
+};
+
+static inline int tcf_em_is_container(struct tcf_ematch *em)
+{
+        return !em->ops;
+}
+
+static inline int tcf_em_is_simple(struct tcf_ematch *em)
+{
+        return em->flags & TCF_EM_SIMPLE;
+}
+
+static inline int tcf_em_is_inverted(struct tcf_ematch *em)
+{
+        return em->flags & TCF_EM_INVERT;
+}
+
+static inline int tcf_em_last_match(struct tcf_ematch *em)
+{
+        return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
+}
+
+static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
+{
+        if (tcf_em_last_match(em))
+                return 1;
+
+        if (result == 0 && em->flags & TCF_EM_REL_AND)
+                return 1;
+
+        if (result != 0 && em->flags & TCF_EM_REL_OR)
+                return 1;
+
+        return 0;
+}
+        
+/**
+ * struct tcf_ematch_tree - ematch tree handle
+ *
+ * @hdr: ematch tree header supplied by userspace
+ * @matches: array of ematches
+ */
+struct tcf_ematch_tree
+{
+        struct tcf_ematch_tree_hdr hdr;
+        struct tcf_ematch *     matches;
+        
+};
+
+/**
+ * struct tcf_ematch_ops - ematch module operations
+ * 
+ * @kind: identifier (kind) of this ematch module
+ * @datalen: length of expected configuration data (optional)
+ * @change: called during validation (optional)
+ * @match: called during ematch tree evaluation, must return 1/0
+ * @destroy: called during destroyage (optional)
+ * @dump: called during dumping process (optional)
+ * @owner: owner, must be set to THIS_MODULE
+ * @link: link to previous/next ematch module (internal use)
+ */
+struct tcf_ematch_ops
+{
+        int                     kind;
+        int                     datalen;
+        int                     (*change)(struct tcf_proto *, void *,
+                                          int, struct tcf_ematch *);
+        int                     (*match)(struct sk_buff *, struct tcf_ematch *,
+                                         struct tcf_pkt_info *);
+        void                    (*destroy)(struct tcf_proto *,
+                                           struct tcf_ematch *);
+        int                     (*dump)(struct sk_buff *, struct tcf_ematch *);
+        struct module           *owner;
+        struct list_head        link;
+};
+
+extern int tcf_em_register(struct tcf_ematch_ops *);
+extern int tcf_em_unregister(struct tcf_ematch_ops *);
+extern int tcf_em_tree_validate(struct tcf_proto *, struct rtattr *,
+                                struct tcf_ematch_tree *);
+extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
+extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
+extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
+                               struct tcf_pkt_info *);
+
+/**
+ * tcf_em_tree_change - replace ematch tree of a running classifier
+ *
+ * @tp: classifier kind handle
+ * @dst: destination ematch tree variable
+ * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
+ *
+ * This functions replaces the ematch tree in @dst with the ematch
+ * tree in @src. The classifier in charge of the ematch tree may be
+ * running.
+ */
+static inline void tcf_em_tree_change(struct tcf_proto *tp,
+                                      struct tcf_ematch_tree *dst,
+                                      struct tcf_ematch_tree *src)
+{
+        tcf_tree_lock(tp);
+        memcpy(dst, src, sizeof(*dst));
+        tcf_tree_unlock(tp);
+}
+
+/**
+ * tcf_em_tree_match - evaulate an ematch tree
+ *
+ * @skb: socket buffer of the packet in question
+ * @tree: ematch tree to be used for evaluation
+ * @info: packet information examined by classifier
+ *
+ * This function matches @skb against the ematch tree in @tree by going
+ * through all ematches respecting their logic relations returning
+ * as soon as the result is obvious.
+ *
+ * Returns 1 if the ematch tree as-one matches, no ematches are configured
+ * or ematch is not enabled in the kernel, otherwise 0 is returned.
+ */
+static inline int tcf_em_tree_match(struct sk_buff *skb,
+                                    struct tcf_ematch_tree *tree,
+                                    struct tcf_pkt_info *info)
+{
+        if (tree->hdr.nmatches)
+                return __tcf_em_tree_match(skb, tree, info);
+        else
+                return 1;
+}
+
+#else /* CONFIG_NET_EMATCH */
+
+struct tcf_ematch_tree
+{
+};
+
+#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
+#define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0)
+#define tcf_em_tree_dump(skb, t, tlv) (0)
+#define tcf_em_tree_change(tp, dst, src) do { } while(0)
+#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
+
+#endif /* CONFIG_NET_EMATCH */
+
+static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
+{
+        switch (layer) {
+                case TCF_LAYER_LINK:
+                        return skb->data;
+                case TCF_LAYER_NETWORK:
+                        return skb->nh.raw;
+                case TCF_LAYER_TRANSPORT:
+                        return skb->h.raw;
+        }
+
+        return NULL;
+}
+
+static inline int tcf_valid_offset(struct sk_buff *skb, unsigned char *ptr,
+                                   int len)
+{
+        return unlikely((ptr + len) < skb->tail && ptr > skb->head);
+}
+
+#ifdef CONFIG_NET_CLS_IND
+static inline int
+tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv)
+{
+        if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
+                return -EINVAL;
+        return 0;
+}
+
+static inline int
+tcf_match_indev(struct sk_buff *skb, char *indev)
+{
+        if (0 != indev[0]) {
+                if  (NULL == skb->input_dev)
+                        return 0;
+                else if (0 != strcmp(indev, skb->input_dev->name))
+                        return 0;
+        }
+
+        return 1;
+}
+#endif /* CONFIG_NET_CLS_IND */
+
+#endif