diff options
Diffstat (limited to 'net/sched/act_simple.c')
| -rw-r--r-- | net/sched/act_simple.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c new file mode 100644 index 0000000..e7851ce --- /dev/null +++ b/net/sched/act_simple.c @@ -0,0 +1,217 @@ +/* + * net/sched/simp.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/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 +static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1]; +static u32 simp_idx_gen; +static DEFINE_RWLOCK(simp_lock); + +static struct tcf_hashinfo simp_hash_info = { + .htab = tcf_simp_ht, + .hmask = SIMP_TAB_MASK, + .lock = &simp_lock, +}; + +#define SIMP_MAX_DATA 32 +static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) +{ + struct tcf_defact *d = a->priv; + + spin_lock(&d->tcf_lock); + d->tcf_tm.lastuse = jiffies; + d->tcf_bstats.bytes += qdisc_pkt_len(skb); + d->tcf_bstats.packets++; + + /* 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) + **/ + printk("simple: %s_%d\n", + (char *)d->tcfd_defdata, d->tcf_bstats.packets); + spin_unlock(&d->tcf_lock); + return d->tcf_action; +} + +static int tcf_simp_release(struct tcf_defact *d, int bind) +{ + int ret = 0; + if (d) { + if (bind) + d->tcf_bindcnt--; + d->tcf_refcnt--; + if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) { + kfree(d->tcfd_defdata); + tcf_hash_destroy(&d->common, &simp_hash_info); + ret = 1; + } + } + return ret; +} + +static int alloc_defdata(struct tcf_defact *d, char *defdata) +{ + d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL); + if (unlikely(!d->tcfd_defdata)) + return -ENOMEM; + + 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 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; + struct tcf_common *pc; + 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]); + + pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info); + if (!pc) { + pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, + &simp_idx_gen, &simp_hash_info); + if (unlikely(!pc)) + return -ENOMEM; + + d = to_defact(pc); + ret = alloc_defdata(d, defdata); + if (ret < 0) { + kfree(pc); + return ret; + } + d->tcf_action = parm->action; + ret = ACT_P_CREATED; + } else { + d = to_defact(pc); + if (!ovr) { + tcf_simp_release(d, bind); + return -EEXIST; + } + reset_policy(d, defdata, parm); + } + + if (ret == ACT_P_CREATED) + tcf_hash_insert(pc, &simp_hash_info); + return ret; +} + +static inline int tcf_simp_cleanup(struct tc_action *a, int bind) +{ + struct tcf_defact *d = a->priv; + + if (d) + return tcf_simp_release(d, bind); + return 0; +} + +static inline 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; + struct tcf_t t; + + opt.index = d->tcf_index; + opt.refcnt = d->tcf_refcnt - ref; + opt.bindcnt = d->tcf_bindcnt - bind; + opt.action = d->tcf_action; + NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt); + NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata); + 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); + NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t); + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static struct tc_action_ops act_simp_ops = { + .kind = "simple", + .hinfo = &simp_hash_info, + .type = TCA_ACT_SIMP, + .capab = TCA_CAP_NONE, + .owner = THIS_MODULE, + .act = tcf_simp, + .dump = tcf_simp_dump, + .cleanup = tcf_simp_cleanup, + .init = tcf_simp_init, + .walk = tcf_generic_walker, +}; + +MODULE_AUTHOR("Jamal Hadi Salim(2005)"); +MODULE_DESCRIPTION("Simple example action"); +MODULE_LICENSE("GPL"); + +static int __init simp_init_module(void) +{ + int ret = tcf_register_action(&act_simp_ops); + if (!ret) + printk("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); |
