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