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/types.h> 17 #include <linux/kernel.h> 18 #include <linux/string.h> 19 #include <linux/mm.h> 20 #include <linux/socket.h> 21 #include <linux/sockios.h> 22 #include <linux/in.h> 23 #include <linux/errno.h> 24 #include <linux/interrupt.h> 25 #include <linux/netdevice.h> 26 #include <linux/skbuff.h> 27 #include <linux/rtnetlink.h> 28 #include <linux/module.h> 29 #include <linux/init.h> 30 #include <linux/proc_fs.h> 31 #include <net/netlink.h> 32 #include <net/sock.h> 33 #include <net/pkt_sched.h> 34 #include <linux/tc_act/tc_gact.h> 35 #include <net/tc_act/tc_gact.h> 36 37 #define GACT_TAB_MASK 15 38 static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1]; 39 static u32 gact_idx_gen; 40 static DEFINE_RWLOCK(gact_lock); 41 42 static struct tcf_hashinfo gact_hash_info = { 43 .htab = tcf_gact_ht, 44 .hmask = GACT_TAB_MASK, 45 .lock = &gact_lock, 46 }; 47 48 #ifdef CONFIG_GACT_PROB 49 static int gact_net_rand(struct tcf_gact *gact) 50 { 51 if (!gact->tcfg_pval || net_random() % gact->tcfg_pval) 52 return gact->tcf_action; 53 return gact->tcfg_paction; 54 } 55 56 static int gact_determ(struct tcf_gact *gact) 57 { 58 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) 59 return gact->tcf_action; 60 return gact->tcfg_paction; 61 } 62 63 typedef int (*g_rand)(struct tcf_gact *gact); 64 static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ }; 65 #endif /* CONFIG_GACT_PROB */ 66 67 static int tcf_gact_init(struct rtattr *rta, struct rtattr *est, 68 struct tc_action *a, int ovr, int bind) 69 { 70 struct rtattr *tb[TCA_GACT_MAX]; 71 struct tc_gact *parm; 72 struct tcf_gact *gact; 73 struct tcf_common *pc; 74 int ret = 0; 75 76 if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0) 77 return -EINVAL; 78 79 if (tb[TCA_GACT_PARMS - 1] == NULL || 80 RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm)) 81 return -EINVAL; 82 parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]); 83 84 if (tb[TCA_GACT_PROB-1] != NULL) 85 #ifdef CONFIG_GACT_PROB 86 if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p)) 87 return -EINVAL; 88 #else 89 return -EOPNOTSUPP; 90 #endif 91 92 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info); 93 if (!pc) { 94 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact), 95 bind, &gact_idx_gen, &gact_hash_info); 96 if (unlikely(!pc)) 97 return -ENOMEM; 98 ret = ACT_P_CREATED; 99 } else { 100 if (!ovr) { 101 tcf_hash_release(pc, bind, &gact_hash_info); 102 return -EEXIST; 103 } 104 } 105 106 gact = to_gact(pc); 107 108 spin_lock_bh(&gact->tcf_lock); 109 gact->tcf_action = parm->action; 110 #ifdef CONFIG_GACT_PROB 111 if (tb[TCA_GACT_PROB-1] != NULL) { 112 struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]); 113 gact->tcfg_paction = p_parm->paction; 114 gact->tcfg_pval = p_parm->pval; 115 gact->tcfg_ptype = p_parm->ptype; 116 } 117 #endif 118 spin_unlock_bh(&gact->tcf_lock); 119 if (ret == ACT_P_CREATED) 120 tcf_hash_insert(pc, &gact_hash_info); 121 return ret; 122 } 123 124 static int tcf_gact_cleanup(struct tc_action *a, int bind) 125 { 126 struct tcf_gact *gact = a->priv; 127 128 if (gact) 129 return tcf_hash_release(&gact->common, bind, &gact_hash_info); 130 return 0; 131 } 132 133 static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) 134 { 135 struct tcf_gact *gact = a->priv; 136 int action = TC_ACT_SHOT; 137 138 spin_lock(&gact->tcf_lock); 139 #ifdef CONFIG_GACT_PROB 140 if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL) 141 action = gact_rand[gact->tcfg_ptype](gact); 142 else 143 action = gact->tcf_action; 144 #else 145 action = gact->tcf_action; 146 #endif 147 gact->tcf_bstats.bytes += skb->len; 148 gact->tcf_bstats.packets++; 149 if (action == TC_ACT_SHOT) 150 gact->tcf_qstats.drops++; 151 gact->tcf_tm.lastuse = jiffies; 152 spin_unlock(&gact->tcf_lock); 153 154 return action; 155 } 156 157 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) 158 { 159 unsigned char *b = skb_tail_pointer(skb); 160 struct tc_gact opt; 161 struct tcf_gact *gact = a->priv; 162 struct tcf_t t; 163 164 opt.index = gact->tcf_index; 165 opt.refcnt = gact->tcf_refcnt - ref; 166 opt.bindcnt = gact->tcf_bindcnt - bind; 167 opt.action = gact->tcf_action; 168 RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); 169 #ifdef CONFIG_GACT_PROB 170 if (gact->tcfg_ptype) { 171 struct tc_gact_p p_opt; 172 p_opt.paction = gact->tcfg_paction; 173 p_opt.pval = gact->tcfg_pval; 174 p_opt.ptype = gact->tcfg_ptype; 175 RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); 176 } 177 #endif 178 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); 179 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); 180 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); 181 RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); 182 return skb->len; 183 184 rtattr_failure: 185 nlmsg_trim(skb, b); 186 return -1; 187 } 188 189 static struct tc_action_ops act_gact_ops = { 190 .kind = "gact", 191 .hinfo = &gact_hash_info, 192 .type = TCA_ACT_GACT, 193 .capab = TCA_CAP_NONE, 194 .owner = THIS_MODULE, 195 .act = tcf_gact, 196 .dump = tcf_gact_dump, 197 .cleanup = tcf_gact_cleanup, 198 .lookup = tcf_hash_search, 199 .init = tcf_gact_init, 200 .walk = tcf_generic_walker 201 }; 202 203 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); 204 MODULE_DESCRIPTION("Generic Classifier actions"); 205 MODULE_LICENSE("GPL"); 206 207 static int __init gact_init_module(void) 208 { 209 #ifdef CONFIG_GACT_PROB 210 printk("GACT probability on\n"); 211 #else 212 printk("GACT probability NOT on\n"); 213 #endif 214 return tcf_register_action(&act_gact_ops); 215 } 216 217 static void __exit gact_cleanup_module(void) 218 { 219 tcf_unregister_action(&act_gact_ops); 220 } 221 222 module_init(gact_init_module); 223 module_exit(gact_cleanup_module); 224