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241a94abcf
No functional change intended, aliases will be used in followup commits. Note for backporters: you may need to add aliases also for modules that are already removed in mainline kernel but still in your version. Patches were generated with the help of Coccinelle scripts like: cat >scripts/coccinelle/misc/tcf_alias.cocci <<EOD virtual patch virtual report @ haskernel @ @@ @ tcf_has_kind depends on report && haskernel @ identifier ops; constant K; @@ static struct tcf_proto_ops ops = { .kind = K, ... }; +char module_alias = K; EOD /usr/bin/spatch -D report --cocci-file scripts/coccinelle/misc/tcf_alias.cocci \ --dir . \ -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include \ -I ./arch/x86/include/uapi -I ./arch/x86/include/generated/uapi \ -I ./include/uapi -I ./include/generated/uapi \ --include ./include/linux/compiler-version.h --include ./include/linux/kconfig.h \ --jobs 8 --chunksize 1 2>/dev/null | \ sed 's/char module_alias = "\([^"]*\)";/MODULE_ALIAS_NET_CLS("\1");/' And analogously for: static struct tc_action_ops ops = { .kind = K, static struct Qdisc_ops ops = { .id = K, (Someone familiar would be able to fit those into one .cocci file without sed post processing.) Signed-off-by: Michal Koutný <mkoutny@suse.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Link: https://lore.kernel.org/r/20240201130943.19536-3-mkoutny@suse.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
252 lines
6.0 KiB
C
252 lines
6.0 KiB
C
// 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 <net/tc_wrapper.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 struct tc_action_ops act_simp_ops;
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#define SIMP_MAX_DATA 32
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TC_INDIRECT_SCOPE int tcf_simp_act(struct sk_buff *skb,
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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,
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u64_stats_read(&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, act_simp_ops.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 ACT_P_BOUND;
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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, flags);
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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 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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.size = sizeof(struct tcf_defact),
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};
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MODULE_ALIAS_NET_ACT("simple");
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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, act_simp_ops.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, act_simp_ops.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 = &act_simp_ops.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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