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net/sched/act_simple.c
5.14 KB
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/* * 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. * |
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* Authors: Jamal Hadi Salim (2005-8) |
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* */ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/skbuff.h> #include <linux/rtnetlink.h> |
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#include <net/netlink.h> |
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#include <net/pkt_sched.h> #define TCA_ACT_SIMP 22 |
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#include <linux/tc_act/tc_defact.h> #include <net/tc_act/tc_defact.h> |
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#define SIMP_TAB_MASK 7 static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1]; static u32 simp_idx_gen; |
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static DEFINE_RWLOCK(simp_lock); |
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static struct tcf_hashinfo simp_hash_info = { |
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.htab = tcf_simp_ht, .hmask = SIMP_TAB_MASK, .lock = &simp_lock, }; |
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#define SIMP_MAX_DATA 32 |
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static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) |
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{ |
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struct tcf_defact *d = a->priv; |
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spin_lock(&d->tcf_lock); d->tcf_tm.lastuse = jiffies; |
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bstats_update(&d->tcf_bstats, skb); |
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/* 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) |
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*/ |
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pr_info("simple: %s_%d ", |
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(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; } |
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static int alloc_defdata(struct tcf_defact *d, char *defdata) |
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{ |
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d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
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if (unlikely(!d->tcfd_defdata)) return -ENOMEM; |
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strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
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return 0; } |
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static void reset_policy(struct tcf_defact *d, char *defdata, struct tc_defact *p) |
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{ |
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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); |
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} |
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static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, |
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[TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
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}; |
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static int tcf_simp_init(struct nlattr *nla, struct nlattr *est, |
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struct tc_action *a, int ovr, int bind) { |
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struct nlattr *tb[TCA_DEF_MAX + 1]; |
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struct tc_defact *parm; struct tcf_defact *d; struct tcf_common *pc; |
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char *defdata; |
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int ret = 0, err; |
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if (nla == NULL) |
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return -EINVAL; |
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err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
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if (err < 0) return err; |
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if (tb[TCA_DEF_PARMS] == NULL) |
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return -EINVAL; |
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if (tb[TCA_DEF_DATA] == NULL) |
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return -EINVAL; |
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parm = nla_data(tb[TCA_DEF_PARMS]); defdata = nla_data(tb[TCA_DEF_DATA]); |
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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); |
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if (IS_ERR(pc)) |
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return PTR_ERR(pc); |
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d = to_defact(pc); |
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ret = alloc_defdata(d, defdata); |
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if (ret < 0) { kfree(pc); return ret; } |
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d->tcf_action = parm->action; |
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ret = ACT_P_CREATED; } else { d = to_defact(pc); if (!ovr) { tcf_simp_release(d, bind); return -EEXIST; } |
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reset_policy(d, defdata, parm); |
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} |
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if (ret == ACT_P_CREATED) tcf_hash_insert(pc, &simp_hash_info); return ret; } |
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static int tcf_simp_cleanup(struct tc_action *a, int bind) |
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{ struct tcf_defact *d = a->priv; if (d) return tcf_simp_release(d, bind); return 0; } |
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static int tcf_simp_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_pointer(skb); |
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struct tcf_defact *d = a->priv; |
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struct tc_defact opt = { .index = d->tcf_index, .refcnt = d->tcf_refcnt - ref, .bindcnt = d->tcf_bindcnt - bind, .action = d->tcf_action, }; |
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struct tcf_t t; |
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NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt); |
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NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata); |
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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); |
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NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t); |
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return skb->len; |
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nla_put_failure: |
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nlmsg_trim(skb, b); |
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return -1; |
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} static struct tc_action_ops act_simp_ops = { |
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.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, |
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}; 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) |
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pr_info("Simple TC action Loaded "); |
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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); |