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 <linux/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 42 static u32 idx_gen; 43 static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE]; 44 static DEFINE_RWLOCK(gact_lock); 45 46 /* ovewrride the defaults */ 47 #define tcf_st tcf_gact 48 #define tc_st tc_gact 49 #define tcf_t_lock gact_lock 50 #define tcf_ht tcf_gact_ht 51 52 #define CONFIG_NET_ACT_INIT 1 53 #include <net/pkt_act.h> 54 55 #ifdef CONFIG_GACT_PROB 56 static int gact_net_rand(struct tcf_gact *p) 57 { 58 if (net_random()%p->pval) 59 return p->action; 60 return p->paction; 61 } 62 63 static int gact_determ(struct tcf_gact *p) 64 { 65 if (p->bstats.packets%p->pval) 66 return p->action; 67 return p->paction; 68 } 69 70 typedef int (*g_rand)(struct tcf_gact *p); 71 static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ }; 72 #endif 73 74 static int tcf_gact_init(struct rtattr *rta, struct rtattr *est, 75 struct tc_action *a, int ovr, int bind) 76 { 77 struct rtattr *tb[TCA_GACT_MAX]; 78 struct tc_gact *parm; 79 struct tcf_gact *p; 80 int ret = 0; 81 82 if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0) 83 return -EINVAL; 84 85 if (tb[TCA_GACT_PARMS - 1] == NULL || 86 RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm)) 87 return -EINVAL; 88 parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]); 89 90 if (tb[TCA_GACT_PROB-1] != NULL) 91 #ifdef CONFIG_GACT_PROB 92 if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p)) 93 return -EINVAL; 94 #else 95 return -EOPNOTSUPP; 96 #endif 97 98 p = tcf_hash_check(parm->index, a, ovr, bind); 99 if (p == NULL) { 100 p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind); 101 if (p == NULL) 102 return -ENOMEM; 103 ret = ACT_P_CREATED; 104 } else { 105 if (!ovr) { 106 tcf_hash_release(p, bind); 107 return -EEXIST; 108 } 109 } 110 111 spin_lock_bh(&p->lock); 112 p->action = parm->action; 113 #ifdef CONFIG_GACT_PROB 114 if (tb[TCA_GACT_PROB-1] != NULL) { 115 struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]); 116 p->paction = p_parm->paction; 117 p->pval = p_parm->pval; 118 p->ptype = p_parm->ptype; 119 } 120 #endif 121 spin_unlock_bh(&p->lock); 122 if (ret == ACT_P_CREATED) 123 tcf_hash_insert(p); 124 return ret; 125 } 126 127 static int 128 tcf_gact_cleanup(struct tc_action *a, int bind) 129 { 130 struct tcf_gact *p = PRIV(a, gact); 131 132 if (p != NULL) 133 return tcf_hash_release(p, bind); 134 return 0; 135 } 136 137 static int 138 tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) 139 { 140 struct tcf_gact *p = PRIV(a, gact); 141 int action = TC_ACT_SHOT; 142 143 spin_lock(&p->lock); 144 #ifdef CONFIG_GACT_PROB 145 if (p->ptype && gact_rand[p->ptype] != NULL) 146 action = gact_rand[p->ptype](p); 147 else 148 action = p->action; 149 #else 150 action = p->action; 151 #endif 152 p->bstats.bytes += skb->len; 153 p->bstats.packets++; 154 if (action == TC_ACT_SHOT) 155 p->qstats.drops++; 156 p->tm.lastuse = jiffies; 157 spin_unlock(&p->lock); 158 159 return action; 160 } 161 162 static int 163 tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) 164 { 165 unsigned char *b = skb->tail; 166 struct tc_gact opt; 167 struct tcf_gact *p = PRIV(a, gact); 168 struct tcf_t t; 169 170 opt.index = p->index; 171 opt.refcnt = p->refcnt - ref; 172 opt.bindcnt = p->bindcnt - bind; 173 opt.action = p->action; 174 RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); 175 #ifdef CONFIG_GACT_PROB 176 if (p->ptype) { 177 struct tc_gact_p p_opt; 178 p_opt.paction = p->paction; 179 p_opt.pval = p->pval; 180 p_opt.ptype = p->ptype; 181 RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); 182 } 183 #endif 184 t.install = jiffies_to_clock_t(jiffies - p->tm.install); 185 t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse); 186 t.expires = jiffies_to_clock_t(p->tm.expires); 187 RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); 188 return skb->len; 189 190 rtattr_failure: 191 skb_trim(skb, b - skb->data); 192 return -1; 193 } 194 195 static struct tc_action_ops act_gact_ops = { 196 .kind = "gact", 197 .type = TCA_ACT_GACT, 198 .capab = TCA_CAP_NONE, 199 .owner = THIS_MODULE, 200 .act = tcf_gact, 201 .dump = tcf_gact_dump, 202 .cleanup = tcf_gact_cleanup, 203 .lookup = tcf_hash_search, 204 .init = tcf_gact_init, 205 .walk = tcf_generic_walker 206 }; 207 208 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); 209 MODULE_DESCRIPTION("Generic Classifier actions"); 210 MODULE_LICENSE("GPL"); 211 212 static int __init 213 gact_init_module(void) 214 { 215 #ifdef CONFIG_GACT_PROB 216 printk("GACT probability on\n"); 217 #else 218 printk("GACT probability NOT on\n"); 219 #endif 220 return tcf_register_action(&act_gact_ops); 221 } 222 223 static void __exit 224 gact_cleanup_module(void) 225 { 226 tcf_unregister_action(&act_gact_ops); 227 } 228 229 module_init(gact_init_module); 230 module_exit(gact_cleanup_module); 231