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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/sched/act_pedit.c Generic packet editor
*
* Authors: Jamal Hadi Salim (2002-4)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_pedit.h>
#include <net/tc_act/tc_pedit.h>
#include <uapi/linux/tc_act/tc_pedit.h>
#include <net/pkt_cls.h>
static unsigned int pedit_net_id;
static struct tc_action_ops act_pedit_ops;
static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
};
static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
};
static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
u8 n)
{
struct tcf_pedit_key_ex *keys_ex;
struct tcf_pedit_key_ex *k;
const struct nlattr *ka;
int err = -EINVAL;
int rem;
if (!nla)
return NULL;
keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
if (!keys_ex)
return ERR_PTR(-ENOMEM);
k = keys_ex;
nla_for_each_nested(ka, nla, rem) {
struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
if (!n) {
err = -EINVAL;
goto err_out;
}
n--;
if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
err = -EINVAL;
goto err_out;
}
err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
ka, pedit_key_ex_policy,
NULL);
if (err)
goto err_out;
if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
!tb[TCA_PEDIT_KEY_EX_CMD]) {
err = -EINVAL;
goto err_out;
}
k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
k->cmd > TCA_PEDIT_CMD_MAX) {
err = -EINVAL;
goto err_out;
}
k++;
}
if (n) {
err = -EINVAL;
goto err_out;
}
return keys_ex;
err_out:
kfree(keys_ex);
return ERR_PTR(err);
}
static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
struct tcf_pedit_key_ex *keys_ex, int n)
{
struct nlattr *keys_start = nla_nest_start_noflag(skb,
TCA_PEDIT_KEYS_EX);
if (!keys_start)
goto nla_failure;
for (; n > 0; n--) {
struct nlattr *key_start;
key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
if (!key_start)
goto nla_failure;
if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
goto nla_failure;
nla_nest_end(skb, key_start);
keys_ex++;
}
nla_nest_end(skb, keys_start);
return 0;
nla_failure:
nla_nest_cancel(skb, keys_start);
return -EINVAL;
}
static int tcf_pedit_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
int ovr, int bind, bool rtnl_held,
struct tcf_proto *tp, u32 flags,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, pedit_net_id);
struct nlattr *tb[TCA_PEDIT_MAX + 1];
struct tcf_chain *goto_ch = NULL;
struct tc_pedit_key *keys = NULL;
struct tcf_pedit_key_ex *keys_ex;
struct tc_pedit *parm;
struct nlattr *pattr;
struct tcf_pedit *p;
int ret = 0, err;
int ksize;
u32 index;
if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
return -EINVAL;
}
err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
pedit_policy, NULL);
if (err < 0)
return err;
pattr = tb[TCA_PEDIT_PARMS];
if (!pattr)
pattr = tb[TCA_PEDIT_PARMS_EX];
if (!pattr) {
NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
return -EINVAL;
}
parm = nla_data(pattr);
if (!parm->nkeys) {
NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
return -EINVAL;
}
ksize = parm->nkeys * sizeof(struct tc_pedit_key);
if (nla_len(pattr) < sizeof(*parm) + ksize) {
NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
return -EINVAL;
}
keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
if (IS_ERR(keys_ex))
return PTR_ERR(keys_ex);
index = parm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (!err) {
ret = tcf_idr_create(tn, index, est, a,
&act_pedit_ops, bind, false, 0);
if (ret) {
tcf_idr_cleanup(tn, index);
goto out_free;
}
ret = ACT_P_CREATED;
} else if (err > 0) {
if (bind)
goto out_free;
if (!ovr) {
ret = -EEXIST;
goto out_release;
}
} else {
ret = err;
goto out_free;
}
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0) {
ret = err;
goto out_release;
}
p = to_pedit(*a);
spin_lock_bh(&p->tcf_lock);
if (ret == ACT_P_CREATED ||
(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
keys = kmalloc(ksize, GFP_ATOMIC);
if (!
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