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linux/net/sched/act_ctinfo.c
Michal Koutný 241a94abcf net/sched: Add module aliases for cls_,sch_,act_ modules 
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>
2024-02-02 10:57:55 -08:00

402 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/* net/sched/act_ctinfo.c netfilter ctinfo connmark actions
*
* Copyright (c) 2019 Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/pkt_cls.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>
#include <uapi/linux/tc_act/tc_ctinfo.h>
#include <net/tc_act/tc_ctinfo.h>
#include <net/tc_wrapper.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_zones.h>
static struct tc_action_ops act_ctinfo_ops;
static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
struct tcf_ctinfo_params *cp,
struct sk_buff *skb, int wlen, int proto)
{
u8 dscp, newdscp;
newdscp = (((READ_ONCE(ct->mark) & cp->dscpmask) >> cp->dscpmaskshift) << 2) &
~INET_ECN_MASK;
switch (proto) {
case NFPROTO_IPV4:
dscp = ipv4_get_dsfield(ip_hdr(skb)) & ~INET_ECN_MASK;
if (dscp != newdscp) {
if (likely(!skb_try_make_writable(skb, wlen))) {
ipv4_change_dsfield(ip_hdr(skb),
INET_ECN_MASK,
newdscp);
ca->stats_dscp_set++;
} else {
ca->stats_dscp_error++;
}
}
break;
case NFPROTO_IPV6:
dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & ~INET_ECN_MASK;
if (dscp != newdscp) {
if (likely(!skb_try_make_writable(skb, wlen))) {
ipv6_change_dsfield(ipv6_hdr(skb),
INET_ECN_MASK,
newdscp);
ca->stats_dscp_set++;
} else {
ca->stats_dscp_error++;
}
}
break;
default:
break;
}
}
static void tcf_ctinfo_cpmark_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
struct tcf_ctinfo_params *cp,
struct sk_buff *skb)
{
ca->stats_cpmark_set++;
skb->mark = READ_ONCE(ct->mark) & cp->cpmarkmask;
}
TC_INDIRECT_SCOPE int tcf_ctinfo_act(struct sk_buff *skb,
const struct tc_action *a,
struct tcf_result *res)
{
const struct nf_conntrack_tuple_hash *thash = NULL;
struct tcf_ctinfo *ca = to_ctinfo(a);
struct nf_conntrack_tuple tuple;
struct nf_conntrack_zone zone;
enum ip_conntrack_info ctinfo;
struct tcf_ctinfo_params *cp;
struct nf_conn *ct;
int proto, wlen;
int action;
cp = rcu_dereference_bh(ca->params);
tcf_lastuse_update(&ca->tcf_tm);
tcf_action_update_bstats(&ca->common, skb);
action = READ_ONCE(ca->tcf_action);
wlen = skb_network_offset(skb);
switch (skb_protocol(skb, true)) {
case htons(ETH_P_IP):
wlen += sizeof(struct iphdr);
if (!pskb_may_pull(skb, wlen))
goto out;
proto = NFPROTO_IPV4;
break;
case htons(ETH_P_IPV6):
wlen += sizeof(struct ipv6hdr);
if (!pskb_may_pull(skb, wlen))
goto out;
proto = NFPROTO_IPV6;
break;
default:
goto out;
}
ct = nf_ct_get(skb, &ctinfo);
if (!ct) { /* look harder, usually ingress */
if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
proto, cp->net, &tuple))
goto out;
zone.id = cp->zone;
zone.dir = NF_CT_DEFAULT_ZONE_DIR;
thash = nf_conntrack_find_get(cp->net, &zone, &tuple);
if (!thash)
goto out;
ct = nf_ct_tuplehash_to_ctrack(thash);
}
if (cp->mode & CTINFO_MODE_DSCP)
if (!cp->dscpstatemask || (READ_ONCE(ct->mark) & cp->dscpstatemask))
tcf_ctinfo_dscp_set(ct, ca, cp, skb, wlen, proto);
if (cp->mode & CTINFO_MODE_CPMARK)
tcf_ctinfo_cpmark_set(ct, ca, cp, skb);
if (thash)
nf_ct_put(ct);
out:
return action;
}
static const struct nla_policy ctinfo_policy[TCA_CTINFO_MAX + 1] = {
[TCA_CTINFO_ACT] =
NLA_POLICY_EXACT_LEN(sizeof(struct tc_ctinfo)),
[TCA_CTINFO_ZONE] = { .type = NLA_U16 },
[TCA_CTINFO_PARMS_DSCP_MASK] = { .type = NLA_U32 },
[TCA_CTINFO_PARMS_DSCP_STATEMASK] = { .type = NLA_U32 },
[TCA_CTINFO_PARMS_CPMARK_MASK] = { .type = NLA_U32 },
};
static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
struct tcf_proto *tp, u32 flags,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, act_ctinfo_ops.net_id);
bool bind = flags & TCA_ACT_FLAGS_BIND;
u32 dscpmask = 0, dscpstatemask, index;
struct nlattr *tb[TCA_CTINFO_MAX + 1];
struct tcf_ctinfo_params *cp_new;
struct tcf_chain *goto_ch = NULL;
struct tc_ctinfo *actparm;
struct tcf_ctinfo *ci;
u8 dscpmaskshift;
int ret = 0, err;
if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "ctinfo requires attributes to be passed");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_CTINFO_MAX, nla, ctinfo_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_CTINFO_ACT]) {
NL_SET_ERR_MSG_MOD(extack,
"Missing required TCA_CTINFO_ACT attribute");
return -EINVAL;
}
actparm = nla_data(tb[TCA_CTINFO_ACT]);
/* do some basic validation here before dynamically allocating things */
/* that we would otherwise have to clean up. */
if (tb[TCA_CTINFO_PARMS_DSCP_MASK]) {
dscpmask = nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_MASK]);
/* need contiguous 6 bit mask */
dscpmaskshift = dscpmask ? __ffs(dscpmask) : 0;
if ((~0 & (dscpmask >> dscpmaskshift)) != 0x3f) {
NL_SET_ERR_MSG_ATTR(extack,
tb[TCA_CTINFO_PARMS_DSCP_MASK],
"dscp mask must be 6 contiguous bits");
return -EINVAL;
}
dscpstatemask = tb[TCA_CTINFO_PARMS_DSCP_STATEMASK] ?
nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) : 0;
/* mask & statemask must not overlap */
if (dscpmask & dscpstatemask) {
NL_SET_ERR_MSG_ATTR(extack,
tb[TCA_CTINFO_PARMS_DSCP_STATEMASK],
"dscp statemask must not overlap dscp mask");
return -EINVAL;
}
}
/* done the validation:now to the actual action allocation */
index = actparm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (!err) {
ret = tcf_idr_create_from_flags(tn, index, est, a,
&act_ctinfo_ops, bind, flags);
if (ret) {
tcf_idr_cleanup(tn, index);
return ret;
}
ret = ACT_P_CREATED;
} else if (err > 0) {
if (bind) /* don't override defaults */
return ACT_P_BOUND;
if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
} else {
return err;
}
err = tcf_action_check_ctrlact(actparm->action, tp, &goto_ch, extack);
if (err < 0)
goto release_idr;
ci = to_ctinfo(*a);
cp_new = kzalloc(sizeof(*cp_new), GFP_KERNEL);
if (unlikely(!cp_new)) {
err = -ENOMEM;
goto put_chain;
}
cp_new->net = net;
cp_new->zone = tb[TCA_CTINFO_ZONE] ?
nla_get_u16(tb[TCA_CTINFO_ZONE]) : 0;
if (dscpmask) {
cp_new->dscpmask = dscpmask;
cp_new->dscpmaskshift = dscpmaskshift;
cp_new->dscpstatemask = dscpstatemask;
cp_new->mode |= CTINFO_MODE_DSCP;
}
if (tb[TCA_CTINFO_PARMS_CPMARK_MASK]) {
cp_new->cpmarkmask =
nla_get_u32(tb[TCA_CTINFO_PARMS_CPMARK_MASK]);
cp_new->mode |= CTINFO_MODE_CPMARK;
}
spin_lock_bh(&ci->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, actparm->action, goto_ch);
cp_new = rcu_replace_pointer(ci->params, cp_new,
lockdep_is_held(&ci->tcf_lock));
spin_unlock_bh(&ci->tcf_lock);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
if (cp_new)
kfree_rcu(cp_new, rcu);
return ret;
put_chain:
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
release_idr:
tcf_idr_release(*a, bind);
return err;
}
static int tcf_ctinfo_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
struct tcf_ctinfo *ci = to_ctinfo(a);
struct tc_ctinfo opt = {
.index = ci->tcf_index,
.refcnt = refcount_read(&ci->tcf_refcnt) - ref,
.bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
};
unsigned char *b = skb_tail_pointer(skb);
struct tcf_ctinfo_params *cp;
struct tcf_t t;
spin_lock_bh(&ci->tcf_lock);
cp = rcu_dereference_protected(ci->params,
lockdep_is_held(&ci->tcf_lock));
tcf_tm_dump(&t, &ci->tcf_tm);
if (nla_put_64bit(skb, TCA_CTINFO_TM, sizeof(t), &t, TCA_CTINFO_PAD))
goto nla_put_failure;
opt.action = ci->tcf_action;
if (nla_put(skb, TCA_CTINFO_ACT, sizeof(opt), &opt))
goto nla_put_failure;
if (nla_put_u16(skb, TCA_CTINFO_ZONE, cp->zone))
goto nla_put_failure;
if (cp->mode & CTINFO_MODE_DSCP) {
if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_MASK,
cp->dscpmask))
goto nla_put_failure;
if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_STATEMASK,
cp->dscpstatemask))
goto nla_put_failure;
}
if (cp->mode & CTINFO_MODE_CPMARK) {
if (nla_put_u32(skb, TCA_CTINFO_PARMS_CPMARK_MASK,
cp->cpmarkmask))
goto nla_put_failure;
}
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_SET,
ci->stats_dscp_set, TCA_CTINFO_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_ERROR,
ci->stats_dscp_error, TCA_CTINFO_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_CPMARK_SET,
ci->stats_cpmark_set, TCA_CTINFO_PAD))
goto nla_put_failure;
spin_unlock_bh(&ci->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock_bh(&ci->tcf_lock);
nlmsg_trim(skb, b);
return -1;
}
static void tcf_ctinfo_cleanup(struct tc_action *a)
{
struct tcf_ctinfo *ci = to_ctinfo(a);
struct tcf_ctinfo_params *cp;
cp = rcu_dereference_protected(ci->params, 1);
if (cp)
kfree_rcu(cp, rcu);
}
static struct tc_action_ops act_ctinfo_ops = {
.kind = "ctinfo",
.id = TCA_ID_CTINFO,
.owner = THIS_MODULE,
.act = tcf_ctinfo_act,
.dump = tcf_ctinfo_dump,
.init = tcf_ctinfo_init,
.cleanup= tcf_ctinfo_cleanup,
.size = sizeof(struct tcf_ctinfo),
};
MODULE_ALIAS_NET_ACT("ctinfo");
static __net_init int ctinfo_init_net(struct net *net)
{
struct tc_action_net *tn = net_generic(net, act_ctinfo_ops.net_id);
return tc_action_net_init(net, tn, &act_ctinfo_ops);
}
static void __net_exit ctinfo_exit_net(struct list_head *net_list)
{
tc_action_net_exit(net_list, act_ctinfo_ops.net_id);
}
static struct pernet_operations ctinfo_net_ops = {
.init = ctinfo_init_net,
.exit_batch = ctinfo_exit_net,
.id = &act_ctinfo_ops.net_id,
.size = sizeof(struct tc_action_net),
};
static int __init ctinfo_init_module(void)
{
return tcf_register_action(&act_ctinfo_ops, &ctinfo_net_ops);
}
static void __exit ctinfo_cleanup_module(void)
{
tcf_unregister_action(&act_ctinfo_ops, &ctinfo_net_ops);
}
module_init(ctinfo_init_module);
module_exit(ctinfo_cleanup_module);
MODULE_AUTHOR("Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>");
MODULE_DESCRIPTION("Connection tracking mark actions");
MODULE_LICENSE("GPL");
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