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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
![Cong Wang](/assets/img/avatar_default.png)
This reverts commit ceffcc5e25
.
If we hold that refcnt, the netns can never be destroyed until
all actions are destroyed by user, this breaks our netns design
which we expect all actions are destroyed when we destroy the
whole netns.
Cc: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
486 lines
11 KiB
C
486 lines
11 KiB
C
/*
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* net/sched/act_pedit.c Generic packet editor
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim (2002-4)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_pedit.h>
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#include <net/tc_act/tc_pedit.h>
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#include <uapi/linux/tc_act/tc_pedit.h>
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static unsigned int pedit_net_id;
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static struct tc_action_ops act_pedit_ops;
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static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
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[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
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[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
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};
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static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
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[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
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[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
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};
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static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
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u8 n)
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{
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struct tcf_pedit_key_ex *keys_ex;
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struct tcf_pedit_key_ex *k;
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const struct nlattr *ka;
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int err = -EINVAL;
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int rem;
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if (!nla || !n)
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return NULL;
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keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
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if (!keys_ex)
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return ERR_PTR(-ENOMEM);
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k = keys_ex;
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nla_for_each_nested(ka, nla, rem) {
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struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
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if (!n) {
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err = -EINVAL;
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goto err_out;
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}
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n--;
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if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
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err = -EINVAL;
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goto err_out;
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}
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err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
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pedit_key_ex_policy, NULL);
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if (err)
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goto err_out;
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if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
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!tb[TCA_PEDIT_KEY_EX_CMD]) {
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err = -EINVAL;
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goto err_out;
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}
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k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
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k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
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if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
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k->cmd > TCA_PEDIT_CMD_MAX) {
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err = -EINVAL;
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goto err_out;
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}
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k++;
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}
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if (n) {
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err = -EINVAL;
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goto err_out;
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}
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return keys_ex;
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err_out:
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kfree(keys_ex);
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return ERR_PTR(err);
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}
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static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
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struct tcf_pedit_key_ex *keys_ex, int n)
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{
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struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
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for (; n > 0; n--) {
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struct nlattr *key_start;
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key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
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if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
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nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd)) {
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nlmsg_trim(skb, keys_start);
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return -EINVAL;
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}
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nla_nest_end(skb, key_start);
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keys_ex++;
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}
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nla_nest_end(skb, keys_start);
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return 0;
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}
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static int tcf_pedit_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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struct nlattr *tb[TCA_PEDIT_MAX + 1];
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struct nlattr *pattr;
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struct tc_pedit *parm;
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int ret = 0, err;
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struct tcf_pedit *p;
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struct tc_pedit_key *keys = NULL;
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struct tcf_pedit_key_ex *keys_ex;
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int ksize;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
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if (err < 0)
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return err;
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pattr = tb[TCA_PEDIT_PARMS];
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if (!pattr)
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pattr = tb[TCA_PEDIT_PARMS_EX];
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if (!pattr)
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return -EINVAL;
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parm = nla_data(pattr);
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ksize = parm->nkeys * sizeof(struct tc_pedit_key);
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if (nla_len(pattr) < sizeof(*parm) + ksize)
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return -EINVAL;
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keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
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if (IS_ERR(keys_ex))
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return PTR_ERR(keys_ex);
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if (!tcf_idr_check(tn, parm->index, a, bind)) {
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if (!parm->nkeys)
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return -EINVAL;
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_pedit_ops, bind, false);
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if (ret)
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return ret;
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p = to_pedit(*a);
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keys = kmalloc(ksize, GFP_KERNEL);
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if (keys == NULL) {
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tcf_idr_cleanup(*a, est);
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kfree(keys_ex);
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return -ENOMEM;
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}
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ret = ACT_P_CREATED;
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} else {
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if (bind)
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return 0;
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tcf_idr_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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p = to_pedit(*a);
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if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
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keys = kmalloc(ksize, GFP_KERNEL);
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if (!keys) {
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kfree(keys_ex);
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return -ENOMEM;
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}
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}
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}
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spin_lock_bh(&p->tcf_lock);
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p->tcfp_flags = parm->flags;
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p->tcf_action = parm->action;
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if (keys) {
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kfree(p->tcfp_keys);
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p->tcfp_keys = keys;
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p->tcfp_nkeys = parm->nkeys;
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}
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memcpy(p->tcfp_keys, parm->keys, ksize);
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kfree(p->tcfp_keys_ex);
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p->tcfp_keys_ex = keys_ex;
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spin_unlock_bh(&p->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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}
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static void tcf_pedit_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_pedit *p = to_pedit(a);
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struct tc_pedit_key *keys = p->tcfp_keys;
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kfree(keys);
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kfree(p->tcfp_keys_ex);
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}
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static bool offset_valid(struct sk_buff *skb, int offset)
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{
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if (offset > 0 && offset > skb->len)
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return false;
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if (offset < 0 && -offset > skb_headroom(skb))
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return false;
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return true;
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}
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static int pedit_skb_hdr_offset(struct sk_buff *skb,
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enum pedit_header_type htype, int *hoffset)
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{
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int ret = -EINVAL;
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switch (htype) {
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case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
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if (skb_mac_header_was_set(skb)) {
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*hoffset = skb_mac_offset(skb);
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ret = 0;
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}
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
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*hoffset = skb_network_offset(skb);
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ret = 0;
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
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if (skb_transport_header_was_set(skb)) {
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*hoffset = skb_transport_offset(skb);
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ret = 0;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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};
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return ret;
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}
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static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_pedit *p = to_pedit(a);
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int i;
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if (skb_unclone(skb, GFP_ATOMIC))
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return p->tcf_action;
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spin_lock(&p->tcf_lock);
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tcf_lastuse_update(&p->tcf_tm);
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if (p->tcfp_nkeys > 0) {
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struct tc_pedit_key *tkey = p->tcfp_keys;
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struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
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enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
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enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
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for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
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u32 *ptr, _data;
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int offset = tkey->off;
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int hoffset;
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u32 val;
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int rc;
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if (tkey_ex) {
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htype = tkey_ex->htype;
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cmd = tkey_ex->cmd;
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tkey_ex++;
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}
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rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
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if (rc) {
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pr_info("tc filter pedit bad header type specified (0x%x)\n",
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htype);
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goto bad;
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}
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if (tkey->offmask) {
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char *d, _d;
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if (!offset_valid(skb, hoffset + tkey->at)) {
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pr_info("tc filter pedit 'at' offset %d out of bounds\n",
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hoffset + tkey->at);
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goto bad;
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}
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d = skb_header_pointer(skb, hoffset + tkey->at, 1,
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&_d);
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if (!d)
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goto bad;
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offset += (*d & tkey->offmask) >> tkey->shift;
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}
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if (offset % 4) {
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pr_info("tc filter pedit"
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" offset must be on 32 bit boundaries\n");
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goto bad;
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}
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if (!offset_valid(skb, hoffset + offset)) {
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pr_info("tc filter pedit offset %d out of bounds\n",
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hoffset + offset);
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goto bad;
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}
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ptr = skb_header_pointer(skb, hoffset + offset, 4, &_data);
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if (!ptr)
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goto bad;
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/* just do it, baby */
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switch (cmd) {
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case TCA_PEDIT_KEY_EX_CMD_SET:
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val = tkey->val;
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break;
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case TCA_PEDIT_KEY_EX_CMD_ADD:
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val = (*ptr + tkey->val) & ~tkey->mask;
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break;
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default:
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pr_info("tc filter pedit bad command (%d)\n",
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cmd);
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goto bad;
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}
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*ptr = ((*ptr & tkey->mask) ^ val);
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if (ptr == &_data)
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skb_store_bits(skb, hoffset + offset, ptr, 4);
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}
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goto done;
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} else
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WARN(1, "pedit BUG: index %d\n", p->tcf_index);
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bad:
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p->tcf_qstats.overlimits++;
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done:
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bstats_update(&p->tcf_bstats, skb);
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spin_unlock(&p->tcf_lock);
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return p->tcf_action;
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}
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static int tcf_pedit_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_pedit *p = to_pedit(a);
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struct tc_pedit *opt;
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struct tcf_t t;
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int s;
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s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
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/* netlink spinlocks held above us - must use ATOMIC */
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opt = kzalloc(s, GFP_ATOMIC);
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if (unlikely(!opt))
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return -ENOBUFS;
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memcpy(opt->keys, p->tcfp_keys,
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p->tcfp_nkeys * sizeof(struct tc_pedit_key));
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opt->index = p->tcf_index;
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opt->nkeys = p->tcfp_nkeys;
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opt->flags = p->tcfp_flags;
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opt->action = p->tcf_action;
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opt->refcnt = p->tcf_refcnt - ref;
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opt->bindcnt = p->tcf_bindcnt - bind;
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if (p->tcfp_keys_ex) {
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tcf_pedit_key_ex_dump(skb, p->tcfp_keys_ex, p->tcfp_nkeys);
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if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
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goto nla_put_failure;
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} else {
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if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
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goto nla_put_failure;
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}
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tcf_tm_dump(&t, &p->tcf_tm);
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if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
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goto nla_put_failure;
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kfree(opt);
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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kfree(opt);
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return -1;
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}
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static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static struct tc_action_ops act_pedit_ops = {
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.kind = "pedit",
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.type = TCA_ACT_PEDIT,
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.owner = THIS_MODULE,
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.act = tcf_pedit,
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.dump = tcf_pedit_dump,
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.cleanup = tcf_pedit_cleanup,
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.init = tcf_pedit_init,
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.walk = tcf_pedit_walker,
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.lookup = tcf_pedit_search,
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.size = sizeof(struct tcf_pedit),
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};
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static __net_init int pedit_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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return tc_action_net_init(tn, &act_pedit_ops);
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}
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static void __net_exit pedit_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations pedit_net_ops = {
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.init = pedit_init_net,
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.exit = pedit_exit_net,
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.id = &pedit_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(2002-4)");
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MODULE_DESCRIPTION("Generic Packet Editor actions");
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MODULE_LICENSE("GPL");
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static int __init pedit_init_module(void)
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{
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return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
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}
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static void __exit pedit_cleanup_module(void)
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{
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tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
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}
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module_init(pedit_init_module);
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module_exit(pedit_cleanup_module);
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