diff options
Diffstat (limited to 'kernel/net/sched/act_simple.c')
| -rw-r--r-- | kernel/net/sched/act_simple.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/kernel/net/sched/act_simple.c b/kernel/net/sched/act_simple.c new file mode 100644 index 000000000..6a8d94886 --- /dev/null +++ b/kernel/net/sched/act_simple.c @@ -0,0 +1,192 @@ +/* + * net/sched/act_simple.c Simple example of an action + * + * 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. + * + * Authors: Jamal Hadi Salim (2005-8) + * + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <net/netlink.h> +#include <net/pkt_sched.h> + +#define TCA_ACT_SIMP 22 + +#include <linux/tc_act/tc_defact.h> +#include <net/tc_act/tc_defact.h> + +#define SIMP_TAB_MASK 7 + +#define SIMP_MAX_DATA 32 +static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, + struct tcf_result *res) +{ + struct tcf_defact *d = a->priv; + + spin_lock(&d->tcf_lock); + d->tcf_tm.lastuse = jiffies; + bstats_update(&d->tcf_bstats, skb); + + /* print policy string followed by _ then packet count + * Example if this was the 3rd packet and the string was "hello" + * then it would look like "hello_3" (without quotes) + */ + pr_info("simple: %s_%d\n", + (char *)d->tcfd_defdata, d->tcf_bstats.packets); + spin_unlock(&d->tcf_lock); + return d->tcf_action; +} + +static void tcf_simp_release(struct tc_action *a, int bind) +{ + struct tcf_defact *d = to_defact(a); + kfree(d->tcfd_defdata); +} + +static int alloc_defdata(struct tcf_defact *d, char *defdata) +{ + d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); + if (unlikely(!d->tcfd_defdata)) + return -ENOMEM; + strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); + return 0; +} + +static void reset_policy(struct tcf_defact *d, char *defdata, + struct tc_defact *p) +{ + spin_lock_bh(&d->tcf_lock); + d->tcf_action = p->action; + memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); + strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); + spin_unlock_bh(&d->tcf_lock); +} + +static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { + [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, + [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, +}; + +static int tcf_simp_init(struct net *net, struct nlattr *nla, + struct nlattr *est, struct tc_action *a, + int ovr, int bind) +{ + struct nlattr *tb[TCA_DEF_MAX + 1]; + struct tc_defact *parm; + struct tcf_defact *d; + char *defdata; + int ret = 0, err; + + if (nla == NULL) + return -EINVAL; + + err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); + if (err < 0) + return err; + + if (tb[TCA_DEF_PARMS] == NULL) + return -EINVAL; + + if (tb[TCA_DEF_DATA] == NULL) + return -EINVAL; + + parm = nla_data(tb[TCA_DEF_PARMS]); + defdata = nla_data(tb[TCA_DEF_DATA]); + + if (!tcf_hash_check(parm->index, a, bind)) { + ret = tcf_hash_create(parm->index, est, a, sizeof(*d), bind); + if (ret) + return ret; + + d = to_defact(a); + ret = alloc_defdata(d, defdata); + if (ret < 0) { + tcf_hash_cleanup(a, est); + return ret; + } + d->tcf_action = parm->action; + ret = ACT_P_CREATED; + } else { + d = to_defact(a); + + if (bind) + return 0; + tcf_hash_release(a, bind); + if (!ovr) + return -EEXIST; + + reset_policy(d, defdata, parm); + } + + if (ret == ACT_P_CREATED) + tcf_hash_insert(a); + return ret; +} + +static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, + int bind, int ref) +{ + unsigned char *b = skb_tail_pointer(skb); + struct tcf_defact *d = a->priv; + struct tc_defact opt = { + .index = d->tcf_index, + .refcnt = d->tcf_refcnt - ref, + .bindcnt = d->tcf_bindcnt - bind, + .action = d->tcf_action, + }; + struct tcf_t t; + + if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || + nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) + goto nla_put_failure; + t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); + t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); + t.expires = jiffies_to_clock_t(d->tcf_tm.expires); + if (nla_put(skb, TCA_DEF_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_simp_ops = { + .kind = "simple", + .type = TCA_ACT_SIMP, + .owner = THIS_MODULE, + .act = tcf_simp, + .dump = tcf_simp_dump, + .cleanup = tcf_simp_release, + .init = tcf_simp_init, +}; + +MODULE_AUTHOR("Jamal Hadi Salim(2005)"); +MODULE_DESCRIPTION("Simple example action"); +MODULE_LICENSE("GPL"); + +static int __init simp_init_module(void) +{ + int ret; + ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK); + if (!ret) + pr_info("Simple TC action Loaded\n"); + return ret; +} + +static void __exit simp_cleanup_module(void) +{ + tcf_unregister_action(&act_simp_ops); +} + +module_init(simp_init_module); +module_exit(simp_cleanup_module); |