pkt_cls.h

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#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;
#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;
};

static inline int
tcf_exts_is_predicative(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
    return !!exts->action;
#else
    return 0;
#endif
}

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);
}

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);
#endif
    return 0;
}

extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
                         struct nlattr *rate_tlv, struct tcf_exts *exts,
                         const 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,
                     const struct tcf_ext_map *map);
extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
                           const struct tcf_ext_map *map);

struct tcf_pkt_info {
    unsigned char *     ptr;
    int         nexthdr;
};

#ifdef CONFIG_NET_EMATCH

struct tcf_ematch_ops;

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 {
    struct tcf_ematch_tree_hdr hdr;
    struct tcf_ematch * matches;
    
};

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 void tcf_em_unregister(struct tcf_ematch_ops *);
extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
                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 *);

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);
}

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;
}

#define MODULE_ALIAS_TCF_EMATCH(kind)   MODULE_ALIAS("ematch-kind-" __stringify(kind))

#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_network_header(skb);
        case TCF_LAYER_TRANSPORT:
            return skb_transport_header(skb);
    }

    return NULL;
}

static inline int tcf_valid_offset(const struct sk_buff *skb,
                   const unsigned char *ptr, const int len)
{
    return likely((ptr + len) <= skb_tail_pointer(skb) &&
              ptr >= skb->head &&
              (ptr <= (ptr + len)));
}

#ifdef CONFIG_NET_CLS_IND
#include <net/net_namespace.h>

static inline int
tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
{
    if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
        return -EINVAL;
    return 0;
}

static inline int
tcf_match_indev(struct sk_buff *skb, char *indev)
{
    struct net_device *dev;

    if (indev[0]) {
        if  (!skb->skb_iif)
            return 0;
        dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);
        if (!dev || strcmp(indev, dev->name))
            return 0;
    }

    return 1;
}
#endif /* CONFIG_NET_CLS_IND */

#endif