include/net/act_generic.h

   1 /*
   2  * include/net/act_generic.h
   3  *
   4 */
   5 #ifndef ACT_GENERIC_H
   6 #define ACT_GENERIC_H
   7 static inline int tcf_defact_release(struct tcf_defact *p, int bind)
   8 {
   9         int ret = 0;
  10         if (p) {
  11                 if (bind) {
  12                         p->bindcnt--;
  13                 }
  14                 p->refcnt--;
  15                 if (p->bindcnt <= 0 && p->refcnt <= 0) {
  16                         kfree(p->defdata);
  17                         tcf_hash_destroy(p);
  18                         ret = 1;
  19                 }
  20         }
  21         return ret;
  22 }
  23
  24 static inline int
  25 alloc_defdata(struct tcf_defact *p, u32 datalen, void *defdata)
  26 {
  27         p->defdata = kmalloc(datalen, GFP_KERNEL);
  28         if (p->defdata == NULL)
  29                 return -ENOMEM;
  30         p->datalen = datalen;
  31         memcpy(p->defdata, defdata, datalen);
  32         return 0;
  33 }
  34
  35 static inline int
  36 realloc_defdata(struct tcf_defact *p, u32 datalen, void *defdata)
  37 {
  38         /* safer to be just brute force for now */
  39         kfree(p->defdata);
  40         return alloc_defdata(p, datalen, defdata);
  41 }
  42
  43 static inline int
  44 tcf_defact_init(struct rtattr *rta, struct rtattr *est,
  45                 struct tc_action *a, int ovr, int bind)
  46 {
  47         struct rtattr *tb[TCA_DEF_MAX];
  48         struct tc_defact *parm;
  49         struct tcf_defact *p;
  50         void *defdata;
  51         u32 datalen = 0;
  52         int ret = 0;
  53
  54         if (rta == NULL || rtattr_parse_nested(tb, TCA_DEF_MAX, rta) < 0)
  55                 return -EINVAL;
  56
  57         if (tb[TCA_DEF_PARMS - 1] == NULL ||
  58             RTA_PAYLOAD(tb[TCA_DEF_PARMS - 1]) < sizeof(*parm))
  59                 return -EINVAL;
  60
  61         parm = RTA_DATA(tb[TCA_DEF_PARMS - 1]);
  62         defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);
  63         if (defdata == NULL)
  64                 return -EINVAL;
  65
  66         datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);
  67         if (datalen <= 0)
  68                 return -EINVAL;
  69
  70         p = tcf_hash_check(parm->index, a, ovr, bind);
  71         if (p == NULL) {
  72                 p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
  73                 if (p == NULL)
  74                         return -ENOMEM;
  75
  76                 ret = alloc_defdata(p, datalen, defdata);
  77                 if (ret < 0) {
  78                         kfree(p);
  79                         return ret;
  80                 }
  81                 ret = ACT_P_CREATED;
  82         } else {
  83                 if (!ovr) {
  84                         tcf_defact_release(p, bind);
  85                         return -EEXIST;
  86                 }
  87                 realloc_defdata(p, datalen, defdata);
  88         }
  89
  90         spin_lock_bh(&p->lock);
  91         p->action = parm->action;
  92         spin_unlock_bh(&p->lock);
  93         if (ret == ACT_P_CREATED)
  94                 tcf_hash_insert(p);
  95         return ret;
  96 }
  97
  98 static inline int tcf_defact_cleanup(struct tc_action *a, int bind)
  99 {
 100         struct tcf_defact *p = PRIV(a, defact);
 101
 102         if (p != NULL)
 103                 return tcf_defact_release(p, bind);
 104         return 0;
 105 }
 106
 107 static inline int
 108 tcf_defact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 109 {
 110         unsigned char *b = skb->tail;
 111         struct tc_defact opt;
 112         struct tcf_defact *p = PRIV(a, defact);
 113         struct tcf_t t;
 114
 115         opt.index = p->index;
 116         opt.refcnt = p->refcnt - ref;
 117         opt.bindcnt = p->bindcnt - bind;
 118         opt.action = p->action;
 119         RTA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
 120         RTA_PUT(skb, TCA_DEF_DATA, p->datalen, p->defdata);
 121         t.install = jiffies_to_clock_t(jiffies - p->tm.install);
 122         t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
 123         t.expires = jiffies_to_clock_t(p->tm.expires);
 124         RTA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
 125         return skb->len;
 126
 127 rtattr_failure:
 128         skb_trim(skb, b - skb->data);
 129         return -1;
 130 }
 131
 132 #define tca_use_default_ops \
 133         .dump           =       tcf_defact_dump, \
 134         .cleanup        =       tcf_defact_cleanup, \
 135         .init           =       tcf_defact_init, \
 136         .walk           =       tcf_generic_walker, \
 137
 138 #define tca_use_default_defines(name) \
 139         static u32 idx_gen; \
 140         static struct tcf_defact *tcf_##name_ht[MY_TAB_SIZE]; \
 141         static DEFINE_RWLOCK(##name_lock);
 142 #endif /* _NET_ACT_GENERIC_H */