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![Cong Wang](/assets/img/avatar_default.png)
Since we now hold RTNL lock in tc_action_net_exit(), it is good to batch them to speedup tc action dismantle. 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>
484 lines
11 KiB
C
484 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)
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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 list_head *net_list)
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{
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tc_action_net_exit(net_list, pedit_net_id);
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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_batch = 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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