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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>
281 lines
6.6 KiB
C
281 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/act_connmark.c netfilter connmark retriever action
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* skb mark is over-written
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*
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* Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
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*/
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#include <linux/module.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 <linux/pkt_cls.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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#include <uapi/linux/tc_act/tc_connmark.h>
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#include <net/tc_act/tc_connmark.h>
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#include <net/tc_wrapper.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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static struct tc_action_ops act_connmark_ops;
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TC_INDIRECT_SCOPE int tcf_connmark_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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const struct nf_conntrack_tuple_hash *thash;
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struct nf_conntrack_tuple tuple;
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enum ip_conntrack_info ctinfo;
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struct tcf_connmark_info *ca = to_connmark(a);
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struct tcf_connmark_parms *parms;
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struct nf_conntrack_zone zone;
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struct nf_conn *c;
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int proto;
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tcf_lastuse_update(&ca->tcf_tm);
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tcf_action_update_bstats(&ca->common, skb);
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parms = rcu_dereference_bh(ca->parms);
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switch (skb_protocol(skb, true)) {
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case htons(ETH_P_IP):
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if (skb->len < sizeof(struct iphdr))
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goto out;
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proto = NFPROTO_IPV4;
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break;
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case htons(ETH_P_IPV6):
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if (skb->len < sizeof(struct ipv6hdr))
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goto out;
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proto = NFPROTO_IPV6;
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break;
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default:
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goto out;
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}
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c = nf_ct_get(skb, &ctinfo);
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if (c) {
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skb->mark = READ_ONCE(c->mark);
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goto count;
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}
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if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, parms->net,
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&tuple))
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goto out;
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zone.id = parms->zone;
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zone.dir = NF_CT_DEFAULT_ZONE_DIR;
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thash = nf_conntrack_find_get(parms->net, &zone, &tuple);
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if (!thash)
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goto out;
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c = nf_ct_tuplehash_to_ctrack(thash);
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skb->mark = READ_ONCE(c->mark);
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nf_ct_put(c);
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count:
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/* using overlimits stats to count how many packets marked */
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tcf_action_inc_overlimit_qstats(&ca->common);
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out:
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return READ_ONCE(ca->tcf_action);
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}
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static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
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[TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
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};
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static int tcf_connmark_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_connmark_ops.net_id);
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struct tcf_connmark_parms *nparms, *oparms;
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struct nlattr *tb[TCA_CONNMARK_MAX + 1];
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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struct tcf_chain *goto_ch = NULL;
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struct tcf_connmark_info *ci;
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struct tc_connmark *parm;
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int ret = 0, err;
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u32 index;
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if (!nla)
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return -EINVAL;
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ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
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connmark_policy, NULL);
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if (ret < 0)
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return ret;
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if (!tb[TCA_CONNMARK_PARMS])
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return -EINVAL;
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nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
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if (!nparms)
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return -ENOMEM;
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parm = nla_data(tb[TCA_CONNMARK_PARMS]);
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index = parm->index;
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ret = tcf_idr_check_alloc(tn, &index, a, bind);
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if (!ret) {
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ret = tcf_idr_create_from_flags(tn, index, est, a,
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&act_connmark_ops, bind, flags);
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if (ret) {
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tcf_idr_cleanup(tn, index);
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err = ret;
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goto out_free;
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}
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ci = to_connmark(*a);
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nparms->net = net;
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nparms->zone = parm->zone;
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ret = ACT_P_CREATED;
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} else if (ret > 0) {
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ci = to_connmark(*a);
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if (bind) {
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err = ACT_P_BOUND;
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goto out_free;
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}
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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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nparms->net = rtnl_dereference(ci->parms)->net;
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nparms->zone = parm->zone;
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ret = 0;
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} else {
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err = ret;
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goto out_free;
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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spin_lock_bh(&ci->tcf_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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oparms = rcu_replace_pointer(ci->parms, nparms, lockdep_is_held(&ci->tcf_lock));
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spin_unlock_bh(&ci->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (oparms)
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kfree_rcu(oparms, rcu);
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return ret;
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release_idr:
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tcf_idr_release(*a, bind);
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out_free:
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kfree(nparms);
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return err;
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}
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static inline int tcf_connmark_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_connmark_info *ci = to_connmark(a);
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struct tc_connmark opt = {
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.index = ci->tcf_index,
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.refcnt = refcount_read(&ci->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
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};
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struct tcf_connmark_parms *parms;
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struct tcf_t t;
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spin_lock_bh(&ci->tcf_lock);
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parms = rcu_dereference_protected(ci->parms, lockdep_is_held(&ci->tcf_lock));
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opt.action = ci->tcf_action;
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opt.zone = parms->zone;
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if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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tcf_tm_dump(&t, &ci->tcf_tm);
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if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
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TCA_CONNMARK_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&ci->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&ci->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 void tcf_connmark_cleanup(struct tc_action *a)
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{
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struct tcf_connmark_info *ci = to_connmark(a);
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struct tcf_connmark_parms *parms;
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parms = rcu_dereference_protected(ci->parms, 1);
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if (parms)
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kfree_rcu(parms, rcu);
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}
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static struct tc_action_ops act_connmark_ops = {
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.kind = "connmark",
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.id = TCA_ID_CONNMARK,
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.owner = THIS_MODULE,
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.act = tcf_connmark_act,
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.dump = tcf_connmark_dump,
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.init = tcf_connmark_init,
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.cleanup = tcf_connmark_cleanup,
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.size = sizeof(struct tcf_connmark_info),
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};
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MODULE_ALIAS_NET_ACT("connmark");
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static __net_init int connmark_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, act_connmark_ops.net_id);
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return tc_action_net_init(net, tn, &act_connmark_ops);
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}
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static void __net_exit connmark_exit_net(struct list_head *net_list)
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{
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tc_action_net_exit(net_list, act_connmark_ops.net_id);
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}
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static struct pernet_operations connmark_net_ops = {
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.init = connmark_init_net,
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.exit_batch = connmark_exit_net,
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.id = &act_connmark_ops.net_id,
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.size = sizeof(struct tc_action_net),
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};
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static int __init connmark_init_module(void)
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{
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return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
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}
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static void __exit connmark_cleanup_module(void)
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{
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tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
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}
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module_init(connmark_init_module);
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module_exit(connmark_cleanup_module);
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MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
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MODULE_DESCRIPTION("Connection tracking mark restoring");
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MODULE_LICENSE("GPL");
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