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267 lines
6.4 KiB
267 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* net/sched/act_simple.c Simple example of an action |
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* |
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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> |
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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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#include <net/pkt_cls.h> |
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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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static unsigned int simp_net_id; |
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static struct tc_action_ops act_simp_ops; |
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#define SIMP_MAX_DATA 32 |
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static int tcf_simp_act(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 = to_defact(a); |
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spin_lock(&d->tcf_lock); |
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tcf_lastuse_update(&d->tcf_tm); |
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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_%llu\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 void tcf_simp_release(struct tc_action *a) |
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{ |
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struct tcf_defact *d = to_defact(a); |
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kfree(d->tcfd_defdata); |
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} |
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static int alloc_defdata(struct tcf_defact *d, const struct nlattr *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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nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
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return 0; |
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} |
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static int reset_policy(struct tc_action *a, const struct nlattr *defdata, |
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struct tc_defact *p, struct tcf_proto *tp, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tcf_chain *goto_ch = NULL; |
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struct tcf_defact *d; |
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int err; |
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err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack); |
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if (err < 0) |
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return err; |
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d = to_defact(a); |
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spin_lock_bh(&d->tcf_lock); |
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goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch); |
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memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); |
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nla_strscpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
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spin_unlock_bh(&d->tcf_lock); |
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if (goto_ch) |
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tcf_chain_put_by_act(goto_ch); |
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return 0; |
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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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struct tcf_proto *tp, u32 flags, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, simp_net_id); |
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bool bind = flags & TCA_ACT_FLAGS_BIND; |
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struct nlattr *tb[TCA_DEF_MAX + 1]; |
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struct tcf_chain *goto_ch = NULL; |
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struct tc_defact *parm; |
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struct tcf_defact *d; |
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bool exists = false; |
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int ret = 0, err; |
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u32 index; |
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if (nla == NULL) |
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return -EINVAL; |
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err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy, |
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NULL); |
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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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parm = nla_data(tb[TCA_DEF_PARMS]); |
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index = parm->index; |
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err = tcf_idr_check_alloc(tn, &index, a, bind); |
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if (err < 0) |
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return err; |
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exists = err; |
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if (exists && bind) |
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return 0; |
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if (tb[TCA_DEF_DATA] == NULL) { |
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if (exists) |
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tcf_idr_release(*a, bind); |
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else |
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tcf_idr_cleanup(tn, index); |
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return -EINVAL; |
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} |
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if (!exists) { |
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ret = tcf_idr_create(tn, index, est, a, |
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&act_simp_ops, bind, false, 0); |
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if (ret) { |
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tcf_idr_cleanup(tn, index); |
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return ret; |
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} |
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d = to_defact(*a); |
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
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extack); |
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if (err < 0) |
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goto release_idr; |
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err = alloc_defdata(d, tb[TCA_DEF_DATA]); |
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if (err < 0) |
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goto put_chain; |
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tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
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ret = ACT_P_CREATED; |
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} else { |
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if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
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err = -EEXIST; |
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goto release_idr; |
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} |
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err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack); |
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if (err) |
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goto release_idr; |
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} |
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return ret; |
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put_chain: |
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if (goto_ch) |
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tcf_chain_put_by_act(goto_ch); |
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release_idr: |
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tcf_idr_release(*a, bind); |
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return err; |
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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 = to_defact(a); |
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struct tc_defact opt = { |
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.index = d->tcf_index, |
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.refcnt = refcount_read(&d->tcf_refcnt) - ref, |
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.bindcnt = atomic_read(&d->tcf_bindcnt) - bind, |
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}; |
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struct tcf_t t; |
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spin_lock_bh(&d->tcf_lock); |
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opt.action = d->tcf_action; |
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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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tcf_tm_dump(&t, &d->tcf_tm); |
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if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
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goto nla_put_failure; |
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spin_unlock_bh(&d->tcf_lock); |
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return skb->len; |
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nla_put_failure: |
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spin_unlock_bh(&d->tcf_lock); |
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nlmsg_trim(skb, b); |
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return -1; |
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} |
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static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
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struct netlink_callback *cb, int type, |
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const struct tc_action_ops *ops, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, simp_net_id); |
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return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
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} |
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static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) |
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{ |
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struct tc_action_net *tn = net_generic(net, simp_net_id); |
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return tcf_idr_search(tn, a, index); |
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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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.id = TCA_ID_SIMP, |
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.owner = THIS_MODULE, |
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.act = tcf_simp_act, |
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.dump = tcf_simp_dump, |
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.cleanup = tcf_simp_release, |
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.init = tcf_simp_init, |
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.walk = tcf_simp_walker, |
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.lookup = tcf_simp_search, |
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.size = sizeof(struct tcf_defact), |
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}; |
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static __net_init int simp_init_net(struct net *net) |
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{ |
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struct tc_action_net *tn = net_generic(net, simp_net_id); |
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return tc_action_net_init(net, tn, &act_simp_ops); |
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} |
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static void __net_exit simp_exit_net(struct list_head *net_list) |
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{ |
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tc_action_net_exit(net_list, simp_net_id); |
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} |
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static struct pernet_operations simp_net_ops = { |
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.init = simp_init_net, |
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.exit_batch = simp_exit_net, |
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.id = &simp_net_id, |
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.size = sizeof(struct tc_action_net), |
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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, &simp_net_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, &simp_net_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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