net/sched/gact.c

   1 /*
   2  * net/sched/gact.c     Generic actions
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * copyright    Jamal Hadi Salim (2002-4)
  10  *
  11  */
  12
  13 #include <asm/uaccess.h>
  14 #include <asm/system.h>
  15 #include <asm/bitops.h>
  16 #include <linux/config.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/socket.h>
  23 #include <linux/sockios.h>
  24 #include <linux/in.h>
  25 #include <linux/errno.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/proc_fs.h>
  33 #include <net/sock.h>
  34 #include <net/pkt_sched.h>
  35 #include <linux/tc_act/tc_gact.h>
  36 #include <net/tc_act/tc_gact.h>
  37
  38 /* use generic hash table */
  39 #define MY_TAB_SIZE     16
  40 #define MY_TAB_MASK     15
  41 static u32 idx_gen;
  42 static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE];
  43 static rwlock_t gact_lock = RW_LOCK_UNLOCKED;
  44
  45 /* ovewrride the defaults */
  46 #define tcf_st  tcf_gact
  47 #define tc_st  tc_gact
  48 #define tcf_t_lock   gact_lock
  49 #define tcf_ht tcf_gact_ht
  50
  51 #define CONFIG_NET_ACT_INIT 1
  52 #include <net/pkt_act.h>
  53
  54 #ifdef CONFIG_GACT_PROB
  55 typedef int (*g_rand)(struct tcf_gact *p);
  56 int
  57 gact_net_rand(struct tcf_gact *p) {
  58         if (net_random()%p->pval)
  59                 return p->action;
  60         return p->paction;
  61 }
  62
  63 int
  64 gact_determ(struct tcf_gact *p) {
  65         if (p->stats.packets%p->pval)
  66                 return p->action;
  67         return p->paction;
  68 }
  69
  70
  71 g_rand gact_rand[MAX_RAND]= { NULL,gact_net_rand, gact_determ};
  72
  73 #endif
  74 int
  75 tcf_gact_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,int ovr,int bind)
  76 {
  77         struct rtattr *tb[TCA_GACT_MAX];
  78         struct tc_gact *parm = NULL;
  79 #ifdef CONFIG_GACT_PROB
  80         struct tc_gact_p *p_parm = NULL;
  81 #endif
  82         struct tcf_gact *p = NULL;
  83         int ret = 0;
  84         int size = sizeof (*p);
  85
  86         if (rtattr_parse(tb, TCA_GACT_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta)) < 0)
  87                 return -1;
  88
  89         if (NULL == a || NULL == tb[TCA_GACT_PARMS - 1]) {
  90                 printk("BUG: tcf_gact_init called with NULL params\n");
  91                 return -1;
  92         }
  93
  94         parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
  95 #ifdef CONFIG_GACT_PROB
  96         if (NULL != tb[TCA_GACT_PROB - 1]) {
  97                 p_parm = RTA_DATA(tb[TCA_GACT_PROB - 1]);
  98         }
  99 #endif
 100
 101         p = tcf_hash_check(parm, a, ovr, bind);
 102
 103         if (NULL == p) {
 104                 p = tcf_hash_create(parm,est,a,size,ovr, bind);
 105
 106                 if (NULL == p) {
 107                         return -1;
 108                 } else {
 109                         p->refcnt = 1;
 110                         ret = 1;
 111                         goto override;
 112                 }
 113         }
 114
 115         if (ovr) {
 116 override:
 117                 p->action = parm->action;
 118 #ifdef CONFIG_GACT_PROB
 119                 if (NULL != p_parm) {
 120                         p->paction = p_parm->paction;
 121                         p->pval = p_parm->pval;
 122                         p->ptype = p_parm->ptype;
 123                 } else {
 124                         p->paction = p->pval = p->ptype = 0;
 125                 }
 126 #endif
 127         }
 128
 129         return ret;
 130 }
 131
 132 int
 133 tcf_gact_cleanup(struct tc_action *a, int bind)
 134 {
 135         struct tcf_gact *p;
 136         p = PRIV(a,gact);
 137         if (NULL != p)
 138                 return tcf_hash_release(p, bind);
 139         return 0;
 140 }
 141
 142 int
 143 tcf_gact(struct sk_buff **pskb, struct tc_action *a)
 144 {
 145         struct tcf_gact *p;
 146         struct sk_buff *skb = *pskb;
 147         int action = TC_ACT_SHOT;
 148
 149         p = PRIV(a,gact);
 150
 151         if (NULL == p) {
 152                 if (net_ratelimit())
 153                         printk("BUG: tcf_gact called with NULL params\n");
 154                 return -1;
 155         }
 156
 157         spin_lock(&p->lock);
 158 #ifdef CONFIG_GACT_PROB
 159         if (p->ptype && NULL != gact_rand[p->ptype])
 160                 action = gact_rand[p->ptype](p);
 161         else
 162                 action = p->action;
 163 #else
 164         action = p->action;
 165 #endif
 166         p->stats.bytes += skb->len;
 167         p->stats.packets++;
 168         if (TC_ACT_SHOT == action)
 169                 p->stats.drops++;
 170         p->tm.lastuse = jiffies;
 171         spin_unlock(&p->lock);
 172
 173         return action;
 174 }
 175
 176 int
 177 tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 178 {
 179         unsigned char *b = skb->tail;
 180         struct tc_gact opt;
 181 #ifdef CONFIG_GACT_PROB
 182         struct tc_gact_p p_opt;
 183 #endif
 184         struct tcf_gact *p;
 185         struct tcf_t t;
 186
 187         p = PRIV(a,gact);
 188         if (NULL == p) {
 189                 printk("BUG: tcf_gact_dump called with NULL params\n");
 190                 goto rtattr_failure;
 191         }
 192
 193         opt.index = p->index;
 194         opt.refcnt = p->refcnt - ref;
 195         opt.bindcnt = p->bindcnt - bind;
 196         opt.action = p->action;
 197         RTA_PUT(skb, TCA_GACT_PARMS, sizeof (opt), &opt);
 198 #ifdef CONFIG_GACT_PROB
 199         if (p->ptype) {
 200                 p_opt.paction = p->paction;
 201                 p_opt.pval = p->pval;
 202                 p_opt.ptype = p->ptype;
 203                 RTA_PUT(skb, TCA_GACT_PROB, sizeof (p_opt), &p_opt);
 204         }
 205 #endif
 206         t.install = jiffies - p->tm.install;
 207         t.lastuse = jiffies - p->tm.lastuse;
 208         t.expires = p->tm.expires;
 209         RTA_PUT(skb, TCA_GACT_TM, sizeof (t), &t);
 210         return skb->len;
 211
 212       rtattr_failure:
 213         skb_trim(skb, b - skb->data);
 214         return -1;
 215 }
 216
 217 int
 218 tcf_gact_stats(struct sk_buff *skb, struct tc_action *a)
 219 {
 220         struct tcf_gact *p;
 221         p = PRIV(a,gact);
 222         if (NULL != p)
 223                 return qdisc_copy_stats(skb, &p->stats,p->stats_lock);
 224
 225         return 1;
 226 }
 227
 228 struct tc_action_ops act_gact_ops = {
 229         .next           =       NULL,
 230         .kind           =       "gact",
 231         .type           =       TCA_ACT_GACT,
 232         .capab          =       TCA_CAP_NONE,
 233         .owner          =       THIS_MODULE,
 234         .act            =       tcf_gact,
 235         .get_stats      =       tcf_gact_stats,
 236         .dump           =       tcf_gact_dump,
 237         .cleanup        =       tcf_gact_cleanup,
 238         .lookup         =       tcf_hash_search,
 239         .init           =       tcf_gact_init,
 240         .walk           =       tcf_generic_walker
 241 };
 242
 243 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
 244 MODULE_DESCRIPTION("Generic Classifier actions");
 245 MODULE_LICENSE("GPL");
 246
 247 static int __init
 248 gact_init_module(void)
 249 {
 250 #ifdef CONFIG_GACT_PROB
 251         printk("GACT probability on\n");
 252 #else
 253         printk("GACT probability NOT on\n");
 254 #endif
 255         return tcf_register_action(&act_gact_ops);
 256 }
 257
 258 static void __exit
 259 gact_cleanup_module(void)
 260 {
 261         tcf_unregister_action(&act_gact_ops);
 262 }
 263
 264 module_init(gact_init_module);
 265 module_exit(gact_cleanup_module);