diff options
Diffstat (limited to 'net/sched/gact.c')
| -rw-r--r-- | net/sched/gact.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/net/sched/gact.c b/net/sched/gact.c new file mode 100644 index 00000000000..a811c89fef7 --- /dev/null +++ b/net/sched/gact.c @@ -0,0 +1,231 @@ +/* + * 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 (net_random()%p->pval) + return p->action; + return p->paction; +} + +static int gact_determ(struct tcf_gact *p) +{ + if (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 **pskb, struct tc_action *a) +{ + struct tcf_gact *p = PRIV(a, gact); + struct sk_buff *skb = *pskb; + 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); |