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linux/net/sched/act_mpls.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

493 lines
13 KiB
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Netronome Systems, Inc. */
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mpls.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/tc_act/tc_mpls.h>
#include <net/mpls.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_mpls.h>
#include <net/tc_wrapper.h>
static struct tc_action_ops act_mpls_ops;
#define ACT_MPLS_TTL_DEFAULT 255
static __be32 tcf_mpls_get_lse(struct mpls_shim_hdr *lse,
struct tcf_mpls_params *p, bool set_bos)
{
u32 new_lse = 0;
if (lse)
new_lse = be32_to_cpu(lse->label_stack_entry);
if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET) {
new_lse &= ~MPLS_LS_LABEL_MASK;
new_lse |= p->tcfm_label << MPLS_LS_LABEL_SHIFT;
}
if (p->tcfm_ttl) {
new_lse &= ~MPLS_LS_TTL_MASK;
new_lse |= p->tcfm_ttl << MPLS_LS_TTL_SHIFT;
}
if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET) {
new_lse &= ~MPLS_LS_TC_MASK;
new_lse |= p->tcfm_tc << MPLS_LS_TC_SHIFT;
}
if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET) {
new_lse &= ~MPLS_LS_S_MASK;
new_lse |= p->tcfm_bos << MPLS_LS_S_SHIFT;
} else if (set_bos) {
new_lse |= 1 << MPLS_LS_S_SHIFT;
}
return cpu_to_be32(new_lse);
}
TC_INDIRECT_SCOPE int tcf_mpls_act(struct sk_buff *skb,
const struct tc_action *a,
struct tcf_result *res)
{
struct tcf_mpls *m = to_mpls(a);
struct tcf_mpls_params *p;
__be32 new_lse;
int ret, mac_len;
tcf_lastuse_update(&m->tcf_tm);
bstats_update(this_cpu_ptr(m->common.cpu_bstats), skb);
/* Ensure 'data' points at mac_header prior calling mpls manipulating
* functions.
*/
if (skb_at_tc_ingress(skb)) {
skb_push_rcsum(skb, skb->mac_len);
mac_len = skb->mac_len;
} else {
mac_len = skb_network_offset(skb);
}
ret = READ_ONCE(m->tcf_action);
p = rcu_dereference_bh(m->mpls_p);
switch (p->tcfm_action) {
case TCA_MPLS_ACT_POP:
if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
skb->dev && skb->dev->type == ARPHRD_ETHER))
goto drop;
break;
case TCA_MPLS_ACT_PUSH:
new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true)));
if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
skb->dev && skb->dev->type == ARPHRD_ETHER))
goto drop;
break;
case TCA_MPLS_ACT_MAC_PUSH:
if (skb_vlan_tag_present(skb)) {
if (__vlan_insert_inner_tag(skb, skb->vlan_proto,
skb_vlan_tag_get(skb),
ETH_HLEN) < 0)
goto drop;
skb->protocol = skb->vlan_proto;
__vlan_hwaccel_clear_tag(skb);
}
new_lse = tcf_mpls_get_lse(NULL, p, mac_len ||
!eth_p_mpls(skb->protocol));
if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false))
goto drop;
break;
case TCA_MPLS_ACT_MODIFY:
if (!pskb_may_pull(skb,
skb_network_offset(skb) + MPLS_HLEN))
goto drop;
new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
if (skb_mpls_update_lse(skb, new_lse))
goto drop;
break;
case TCA_MPLS_ACT_DEC_TTL:
if (skb_mpls_dec_ttl(skb))
goto drop;
break;
}
if (skb_at_tc_ingress(skb))
skb_pull_rcsum(skb, skb->mac_len);
return ret;
drop:
qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats));
return TC_ACT_SHOT;
}
static int valid_label(const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
const u32 *label = nla_data(attr);
if (nla_len(attr) != sizeof(*label)) {
NL_SET_ERR_MSG_MOD(extack, "Invalid MPLS label length");
return -EINVAL;
}
if (*label & ~MPLS_LABEL_MASK || *label == MPLS_LABEL_IMPLNULL) {
NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range");
return -EINVAL;
}
return 0;
}
static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = {
[TCA_MPLS_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)),
[TCA_MPLS_PROTO] = { .type = NLA_U16 },
[TCA_MPLS_LABEL] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
valid_label),
[TCA_MPLS_TC] = NLA_POLICY_RANGE(NLA_U8, 0, 7),
[TCA_MPLS_TTL] = NLA_POLICY_MIN(NLA_U8, 1),
[TCA_MPLS_BOS] = NLA_POLICY_RANGE(NLA_U8, 0, 1),
};
static int tcf_mpls_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_mpls_ops.net_id);
bool bind = flags & TCA_ACT_FLAGS_BIND;
struct nlattr *tb[TCA_MPLS_MAX + 1];
struct tcf_chain *goto_ch = NULL;
struct tcf_mpls_params *p;
struct tc_mpls *parm;
bool exists = false;
struct tcf_mpls *m;
int ret = 0, err;
u8 mpls_ttl = 0;
u32 index;
if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_MPLS_PARMS]) {
NL_SET_ERR_MSG_MOD(extack, "No MPLS params");
return -EINVAL;
}
parm = nla_data(tb[TCA_MPLS_PARMS]);
index = parm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (err < 0)
return err;
exists = err;
if (exists && bind)
return ACT_P_BOUND;
if (!exists) {
ret = tcf_idr_create(tn, index, est, a, &act_mpls_ops, bind,
true, flags);
if (ret) {
tcf_idr_cleanup(tn, index);
return ret;
}
ret = ACT_P_CREATED;
} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
/* Verify parameters against action type. */
switch (parm->m_action) {
case TCA_MPLS_ACT_POP:
if (!tb[TCA_MPLS_PROTO]) {
NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
err = -EINVAL;
goto release_idr;
}
if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
err = -EINVAL;
goto release_idr;
}
if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] ||
tb[TCA_MPLS_BOS]) {
NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
err = -EINVAL;
goto release_idr;
}
break;
case TCA_MPLS_ACT_DEC_TTL:
if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] ||
tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) {
NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
err = -EINVAL;
goto release_idr;
}
break;
case TCA_MPLS_ACT_PUSH:
case TCA_MPLS_ACT_MAC_PUSH:
if (!tb[TCA_MPLS_LABEL]) {
NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
err = -EINVAL;
goto release_idr;
}
if (tb[TCA_MPLS_PROTO] &&
!eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
err = -EPROTONOSUPPORT;
goto release_idr;
}
/* Push needs a TTL - if not specified, set a default value. */
if (!tb[TCA_MPLS_TTL]) {
#if IS_ENABLED(CONFIG_MPLS)
mpls_ttl = net->mpls.default_ttl ?
net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT;
#else
mpls_ttl = ACT_MPLS_TTL_DEFAULT;
#endif
}
break;
case TCA_MPLS_ACT_MODIFY:
if (tb[TCA_MPLS_PROTO]) {
NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
err = -EINVAL;
goto release_idr;
}
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
err = -EINVAL;
goto release_idr;
}
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0)
goto release_idr;
m = to_mpls(*a);
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p) {
err = -ENOMEM;
goto put_chain;
}
p->tcfm_action = parm->m_action;
p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) :
ACT_MPLS_LABEL_NOT_SET;
p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) :
ACT_MPLS_TC_NOT_SET;
p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) :
mpls_ttl;
p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) :
ACT_MPLS_BOS_NOT_SET;
p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) :
htons(ETH_P_MPLS_UC);
spin_lock_bh(&m->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
spin_unlock_bh(&m->tcf_lock);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
if (p)
kfree_rcu(p, 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 void tcf_mpls_cleanup(struct tc_action *a)
{
struct tcf_mpls *m = to_mpls(a);
struct tcf_mpls_params *p;
p = rcu_dereference_protected(m->mpls_p, 1);
if (p)
kfree_rcu(p, rcu);
}
static int tcf_mpls_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
unsigned char *b = skb_tail_pointer(skb);
struct tcf_mpls *m = to_mpls(a);
struct tcf_mpls_params *p;
struct tc_mpls opt = {
.index = m->tcf_index,
.refcnt = refcount_read(&m->tcf_refcnt) - ref,
.bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
};
struct tcf_t t;
spin_lock_bh(&m->tcf_lock);
opt.action = m->tcf_action;
p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock));
opt.m_action = p->tcfm_action;
if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET &&
nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label))
goto nla_put_failure;
if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET &&
nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc))
goto nla_put_failure;
if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl))
goto nla_put_failure;
if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET &&
nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos))
goto nla_put_failure;
if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto))
goto nla_put_failure;
tcf_tm_dump(&t, &m->tcf_tm);
if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD))
goto nla_put_failure;
spin_unlock_bh(&m->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock_bh(&m->tcf_lock);
nlmsg_trim(skb, b);
return -EMSGSIZE;
}
static int tcf_mpls_offload_act_setup(struct tc_action *act, void *entry_data,
u32 *index_inc, bool bind,
struct netlink_ext_ack *extack)
{
if (bind) {
struct flow_action_entry *entry = entry_data;
switch (tcf_mpls_action(act)) {
case TCA_MPLS_ACT_PUSH:
entry->id = FLOW_ACTION_MPLS_PUSH;
entry->mpls_push.proto = tcf_mpls_proto(act);
entry->mpls_push.label = tcf_mpls_label(act);
entry->mpls_push.tc = tcf_mpls_tc(act);
entry->mpls_push.bos = tcf_mpls_bos(act);
entry->mpls_push.ttl = tcf_mpls_ttl(act);
break;
case TCA_MPLS_ACT_POP:
entry->id = FLOW_ACTION_MPLS_POP;
entry->mpls_pop.proto = tcf_mpls_proto(act);
break;
case TCA_MPLS_ACT_MODIFY:
entry->id = FLOW_ACTION_MPLS_MANGLE;
entry->mpls_mangle.label = tcf_mpls_label(act);
entry->mpls_mangle.tc = tcf_mpls_tc(act);
entry->mpls_mangle.bos = tcf_mpls_bos(act);
entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
break;
case TCA_MPLS_ACT_DEC_TTL:
NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"dec_ttl\" option is used");
return -EOPNOTSUPP;
case TCA_MPLS_ACT_MAC_PUSH:
NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"mac_push\" option is used");
return -EOPNOTSUPP;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported MPLS mode offload");
return -EOPNOTSUPP;
}
*index_inc = 1;
} else {
struct flow_offload_action *fl_action = entry_data;
switch (tcf_mpls_action(act)) {
case TCA_MPLS_ACT_PUSH:
fl_action->id = FLOW_ACTION_MPLS_PUSH;
break;
case TCA_MPLS_ACT_POP:
fl_action->id = FLOW_ACTION_MPLS_POP;
break;
case TCA_MPLS_ACT_MODIFY:
fl_action->id = FLOW_ACTION_MPLS_MANGLE;
break;
default:
return -EOPNOTSUPP;
}
}
return 0;
}
static struct tc_action_ops act_mpls_ops = {
.kind = "mpls",
.id = TCA_ID_MPLS,
.owner = THIS_MODULE,
.act = tcf_mpls_act,
.dump = tcf_mpls_dump,
.init = tcf_mpls_init,
.cleanup = tcf_mpls_cleanup,
.offload_act_setup = tcf_mpls_offload_act_setup,
.size = sizeof(struct tcf_mpls),
};
MODULE_ALIAS_NET_ACT("mpls");
static __net_init int mpls_init_net(struct net *net)
{
struct tc_action_net *tn = net_generic(net, act_mpls_ops.net_id);
return tc_action_net_init(net, tn, &act_mpls_ops);
}
static void __net_exit mpls_exit_net(struct list_head *net_list)
{
tc_action_net_exit(net_list, act_mpls_ops.net_id);
}
static struct pernet_operations mpls_net_ops = {
.init = mpls_init_net,
.exit_batch = mpls_exit_net,
.id = &act_mpls_ops.net_id,
.size = sizeof(struct tc_action_net),
};
static int __init mpls_init_module(void)
{
return tcf_register_action(&act_mpls_ops, &mpls_net_ops);
}
static void __exit mpls_cleanup_module(void)
{
tcf_unregister_action(&act_mpls_ops, &mpls_net_ops);
}
module_init(mpls_init_module);
module_exit(mpls_cleanup_module);
MODULE_SOFTDEP("post: mpls_gso");
MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MPLS manipulation actions");
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