![Benjamin LaHaise](/assets/img/avatar_default.png)
Eric Dumazet pointed out that act_mirred needs to find the current net_ns, and struct net pointer is not provided in the call chain. His original patch made use of current->nsproxy->net_ns to find the network namespace, but this fails to work correctly for userspace code that makes use of netlink sockets in different network namespaces. Instead, pass the "struct net *" down along the call chain to where it is needed. This version removes the ifb changes as Eric has submitted that patch separately, but is otherwise identical to the previous version. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Tested-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
226 lines
5.3 KiB
C
226 lines
5.3 KiB
C
/*
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* net/sched/simp.c Simple example of an action
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim (2005-8)
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*
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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>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#define TCA_ACT_SIMP 22
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#include <linux/tc_act/tc_defact.h>
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#include <net/tc_act/tc_defact.h>
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#define SIMP_TAB_MASK 7
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static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
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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,
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.hmask = SIMP_TAB_MASK,
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.lock = &simp_lock,
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};
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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,
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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);
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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
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* Example if this was the 3rd packet and the string was "hello"
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* then it would look like "hello_3" (without quotes)
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*/
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pr_info("simple: %s_%d\n",
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(char *)d->tcfd_defdata, d->tcf_bstats.packets);
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spin_unlock(&d->tcf_lock);
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return d->tcf_action;
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}
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static int tcf_simp_release(struct tcf_defact *d, int bind)
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{
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int ret = 0;
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if (d) {
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if (bind)
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d->tcf_bindcnt--;
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d->tcf_refcnt--;
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if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
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kfree(d->tcfd_defdata);
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tcf_hash_destroy(&d->common, &simp_hash_info);
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ret = 1;
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}
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}
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return ret;
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}
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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))
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return -ENOMEM;
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strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
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return 0;
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}
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static void reset_policy(struct tcf_defact *d, char *defdata,
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struct tc_defact *p)
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{
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spin_lock_bh(&d->tcf_lock);
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d->tcf_action = p->action;
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memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
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strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
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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] = {
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[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 net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action *a,
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int ovr, int bind)
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{
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struct nlattr *tb[TCA_DEF_MAX + 1];
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struct tc_defact *parm;
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struct tcf_defact *d;
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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)
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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]);
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defdata = nla_data(tb[TCA_DEF_DATA]);
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pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
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if (!pc) {
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pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
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&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) {
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if (est)
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gen_kill_estimator(&pc->tcfc_bstats,
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&pc->tcfc_rate_est);
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kfree_rcu(pc, tcfc_rcu);
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return ret;
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}
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d->tcf_action = parm->action;
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ret = ACT_P_CREATED;
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} else {
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d = to_defact(pc);
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if (!ovr) {
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tcf_simp_release(d, bind);
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return -EEXIST;
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}
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reset_policy(d, defdata, parm);
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}
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(pc, &simp_hash_info);
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return ret;
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}
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static int tcf_simp_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_defact *d = a->priv;
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if (d)
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return tcf_simp_release(d, bind);
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return 0;
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}
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static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
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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 = {
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.index = d->tcf_index,
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.refcnt = d->tcf_refcnt - ref,
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.bindcnt = d->tcf_bindcnt - bind,
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.action = d->tcf_action,
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};
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struct tcf_t t;
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if (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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goto nla_put_failure;
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t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
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t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
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if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t))
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goto nla_put_failure;
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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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}
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static struct tc_action_ops act_simp_ops = {
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.kind = "simple",
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.hinfo = &simp_hash_info,
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.type = TCA_ACT_SIMP,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_simp,
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.dump = tcf_simp_dump,
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.cleanup = tcf_simp_cleanup,
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.init = tcf_simp_init,
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.walk = tcf_generic_walker,
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2005)");
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MODULE_DESCRIPTION("Simple example action");
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MODULE_LICENSE("GPL");
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static int __init simp_init_module(void)
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{
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int ret = tcf_register_action(&act_simp_ops);
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if (!ret)
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pr_info("Simple TC action Loaded\n");
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return ret;
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}
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static void __exit simp_cleanup_module(void)
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{
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tcf_unregister_action(&act_simp_ops);
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}
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module_init(simp_init_module);
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module_exit(simp_cleanup_module);
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