232 lines
5.2 KiB
C
232 lines
5.2 KiB
C
![]() |
/*
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* net/sched/gact.c Generic actions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* copyright Jamal Hadi Salim (2002-4)
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*
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*/
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_gact.h>
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#include <net/tc_act/tc_gact.h>
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/* use generic hash table */
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#define MY_TAB_SIZE 16
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#define MY_TAB_MASK 15
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static u32 idx_gen;
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static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE];
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static DEFINE_RWLOCK(gact_lock);
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/* ovewrride the defaults */
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#define tcf_st tcf_gact
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#define tc_st tc_gact
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#define tcf_t_lock gact_lock
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#define tcf_ht tcf_gact_ht
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#define CONFIG_NET_ACT_INIT 1
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#include <net/pkt_act.h>
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#ifdef CONFIG_GACT_PROB
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static int gact_net_rand(struct tcf_gact *p)
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{
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if (net_random()%p->pval)
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return p->action;
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return p->paction;
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}
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static int gact_determ(struct tcf_gact *p)
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{
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if (p->bstats.packets%p->pval)
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return p->action;
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return p->paction;
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}
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typedef int (*g_rand)(struct tcf_gact *p);
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static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
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#endif
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static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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struct rtattr *tb[TCA_GACT_MAX];
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struct tc_gact *parm;
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struct tcf_gact *p;
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int ret = 0;
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if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
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return -EINVAL;
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if (tb[TCA_GACT_PARMS - 1] == NULL ||
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RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
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return -EINVAL;
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parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
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if (tb[TCA_GACT_PROB-1] != NULL)
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#ifdef CONFIG_GACT_PROB
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if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
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return -EINVAL;
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#else
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return -EOPNOTSUPP;
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#endif
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p = tcf_hash_check(parm->index, a, ovr, bind);
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if (p == NULL) {
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p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
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if (p == NULL)
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return -ENOMEM;
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ret = ACT_P_CREATED;
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} else {
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if (!ovr) {
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tcf_hash_release(p, bind);
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return -EEXIST;
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}
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}
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spin_lock_bh(&p->lock);
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p->action = parm->action;
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#ifdef CONFIG_GACT_PROB
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if (tb[TCA_GACT_PROB-1] != NULL) {
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struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
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p->paction = p_parm->paction;
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p->pval = p_parm->pval;
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p->ptype = p_parm->ptype;
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}
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#endif
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spin_unlock_bh(&p->lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(p);
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return ret;
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}
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static int
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tcf_gact_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_gact *p = PRIV(a, gact);
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if (p != NULL)
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return tcf_hash_release(p, bind);
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return 0;
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}
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static int
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tcf_gact(struct sk_buff **pskb, struct tc_action *a)
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{
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struct tcf_gact *p = PRIV(a, gact);
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struct sk_buff *skb = *pskb;
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int action = TC_ACT_SHOT;
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spin_lock(&p->lock);
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#ifdef CONFIG_GACT_PROB
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if (p->ptype && gact_rand[p->ptype] != NULL)
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action = gact_rand[p->ptype](p);
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else
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action = p->action;
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#else
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action = p->action;
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#endif
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p->bstats.bytes += skb->len;
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p->bstats.packets++;
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if (action == TC_ACT_SHOT)
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p->qstats.drops++;
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p->tm.lastuse = jiffies;
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spin_unlock(&p->lock);
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return action;
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}
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static int
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tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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unsigned char *b = skb->tail;
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struct tc_gact opt;
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struct tcf_gact *p = PRIV(a, gact);
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struct tcf_t t;
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opt.index = p->index;
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opt.refcnt = p->refcnt - ref;
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opt.bindcnt = p->bindcnt - bind;
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opt.action = p->action;
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RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
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#ifdef CONFIG_GACT_PROB
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if (p->ptype) {
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struct tc_gact_p p_opt;
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p_opt.paction = p->paction;
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p_opt.pval = p->pval;
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p_opt.ptype = p->ptype;
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RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
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}
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#endif
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t.install = jiffies_to_clock_t(jiffies - p->tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
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t.expires = jiffies_to_clock_t(p->tm.expires);
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RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
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return skb->len;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static struct tc_action_ops act_gact_ops = {
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.kind = "gact",
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.type = TCA_ACT_GACT,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_gact,
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.dump = tcf_gact_dump,
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.cleanup = tcf_gact_cleanup,
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.lookup = tcf_hash_search,
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.init = tcf_gact_init,
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.walk = tcf_generic_walker
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
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MODULE_DESCRIPTION("Generic Classifier actions");
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MODULE_LICENSE("GPL");
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static int __init
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gact_init_module(void)
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{
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#ifdef CONFIG_GACT_PROB
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printk("GACT probability on\n");
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#else
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printk("GACT probability NOT on\n");
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#endif
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return tcf_register_action(&act_gact_ops);
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}
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static void __exit
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gact_cleanup_module(void)
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{
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tcf_unregister_action(&act_gact_ops);
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}
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module_init(gact_init_module);
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module_exit(gact_cleanup_module);
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