diff options
Diffstat (limited to 'net/sched/act_gact.c')
| -rw-r--r-- | net/sched/act_gact.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c new file mode 100644 index 000000000..7fffc2272 --- /dev/null +++ b/net/sched/act_gact.c @@ -0,0 +1,209 @@ +/* + * net/sched/act_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 <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <linux/module.h> +#include <linux/init.h> +#include <net/netlink.h> +#include <net/pkt_sched.h> +#include <linux/tc_act/tc_gact.h> +#include <net/tc_act/tc_gact.h> + +#define GACT_TAB_MASK 15 + +#ifdef CONFIG_GACT_PROB +static int gact_net_rand(struct tcf_gact *gact) +{ + if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval) + return gact->tcf_action; + return gact->tcfg_paction; +} + +static int gact_determ(struct tcf_gact *gact) +{ + if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) + return gact->tcf_action; + return gact->tcfg_paction; +} + +typedef int (*g_rand)(struct tcf_gact *gact); +static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; +#endif /* CONFIG_GACT_PROB */ + +static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { + [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, + [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, +}; + +static int tcf_gact_init(struct net *net, struct nlattr *nla, + struct nlattr *est, struct tc_action *a, + int ovr, int bind) +{ + struct nlattr *tb[TCA_GACT_MAX + 1]; + struct tc_gact *parm; + struct tcf_gact *gact; + int ret = 0; + int err; +#ifdef CONFIG_GACT_PROB + struct tc_gact_p *p_parm = NULL; +#endif + + if (nla == NULL) + return -EINVAL; + + err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); + if (err < 0) + return err; + + if (tb[TCA_GACT_PARMS] == NULL) + return -EINVAL; + parm = nla_data(tb[TCA_GACT_PARMS]); + +#ifndef CONFIG_GACT_PROB + if (tb[TCA_GACT_PROB] != NULL) + return -EOPNOTSUPP; +#else + if (tb[TCA_GACT_PROB]) { + p_parm = nla_data(tb[TCA_GACT_PROB]); + if (p_parm->ptype >= MAX_RAND) + return -EINVAL; + } +#endif + + if (!tcf_hash_check(parm->index, a, bind)) { + ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind); + if (ret) + return ret; + ret = ACT_P_CREATED; + } else { + if (bind)/* dont override defaults */ + return 0; + tcf_hash_release(a, bind); + if (!ovr) + return -EEXIST; + } + + gact = to_gact(a); + + spin_lock_bh(&gact->tcf_lock); + gact->tcf_action = parm->action; +#ifdef CONFIG_GACT_PROB + if (p_parm) { + gact->tcfg_paction = p_parm->paction; + gact->tcfg_pval = p_parm->pval; + gact->tcfg_ptype = p_parm->ptype; + } +#endif + spin_unlock_bh(&gact->tcf_lock); + if (ret == ACT_P_CREATED) + tcf_hash_insert(a); + return ret; +} + +static int tcf_gact(struct sk_buff *skb, const struct tc_action *a, + struct tcf_result *res) +{ + struct tcf_gact *gact = a->priv; + int action = TC_ACT_SHOT; + + spin_lock(&gact->tcf_lock); +#ifdef CONFIG_GACT_PROB + if (gact->tcfg_ptype) + action = gact_rand[gact->tcfg_ptype](gact); + else + action = gact->tcf_action; +#else + action = gact->tcf_action; +#endif + gact->tcf_bstats.bytes += qdisc_pkt_len(skb); + gact->tcf_bstats.packets++; + if (action == TC_ACT_SHOT) + gact->tcf_qstats.drops++; + gact->tcf_tm.lastuse = jiffies; + spin_unlock(&gact->tcf_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_pointer(skb); + struct tcf_gact *gact = a->priv; + struct tc_gact opt = { + .index = gact->tcf_index, + .refcnt = gact->tcf_refcnt - ref, + .bindcnt = gact->tcf_bindcnt - bind, + .action = gact->tcf_action, + }; + struct tcf_t t; + + if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) + goto nla_put_failure; +#ifdef CONFIG_GACT_PROB + if (gact->tcfg_ptype) { + struct tc_gact_p p_opt = { + .paction = gact->tcfg_paction, + .pval = gact->tcfg_pval, + .ptype = gact->tcfg_ptype, + }; + + if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) + goto nla_put_failure; + } +#endif + t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); + t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); + t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); + if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t)) + goto nla_put_failure; + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static struct tc_action_ops act_gact_ops = { + .kind = "gact", + .type = TCA_ACT_GACT, + .owner = THIS_MODULE, + .act = tcf_gact, + .dump = tcf_gact_dump, + .init = tcf_gact_init, +}; + +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 + pr_info("GACT probability on\n"); +#else + pr_info("GACT probability NOT on\n"); +#endif + return tcf_register_action(&act_gact_ops, GACT_TAB_MASK); +} + +static void __exit gact_cleanup_module(void) +{ + tcf_unregister_action(&act_gact_ops); +} + +module_init(gact_init_module); +module_exit(gact_cleanup_module); |