e1e992e52f
(with no apologies to C Heston)
On Mon, 2007-10-09 at 21:00 +0800, Herbert Xu wrote:
On Sun, Sep 02, 2007 at 01:11:29PM +0000, Christian Kujau wrote:
> >
> > after upgrading to 2.6.23-rc5 (and applying davem's fix [0]), lockdep
> > was quite noisy when I tried to shape my external (wireless) interface:
> >
> > [ 6400.534545] FahCore_78.exe/3552 just changed the state of lock:
> > [ 6400.534713] (&dev->ingress_lock){-+..}, at: [<c038d595>]
> > netif_receive_skb+0x2d5/0x3c0
> > [ 6400.534941] but this lock took another, soft-read-irq-unsafe lock in the
> > past:
> > [ 6400.535145] (police_lock){-.--}
>
> This is a genuine dead-lock. The police lock can be taken
> for reading with softirqs on. If a second CPU tries to take
> the police lock for writing, while holding the ingress lock,
> then a softirq on the first CPU can dead-lock when it tries
> to get the ingress lock.
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
1075 lines
23 KiB
C
1075 lines
23 KiB
C
/*
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* net/sched/act_api.c Packet action API.
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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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* Author: Jamal Hadi Salim
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*
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*
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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/init.h>
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#include <linux/kmod.h>
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#include <net/sch_generic.h>
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#include <net/act_api.h>
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#include <net/netlink.h>
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void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
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{
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unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
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struct tcf_common **p1p;
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for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
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if (*p1p == p) {
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write_lock_bh(hinfo->lock);
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*p1p = p->tcfc_next;
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write_unlock_bh(hinfo->lock);
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gen_kill_estimator(&p->tcfc_bstats,
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&p->tcfc_rate_est);
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kfree(p);
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return;
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}
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}
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BUG_TRAP(0);
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}
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EXPORT_SYMBOL(tcf_hash_destroy);
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int tcf_hash_release(struct tcf_common *p, int bind,
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struct tcf_hashinfo *hinfo)
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{
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int ret = 0;
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if (p) {
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if (bind)
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p->tcfc_bindcnt--;
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p->tcfc_refcnt--;
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if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
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tcf_hash_destroy(p, hinfo);
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ret = 1;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(tcf_hash_release);
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static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
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struct tc_action *a, struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p;
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int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
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struct rtattr *r ;
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read_lock_bh(hinfo->lock);
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s_i = cb->args[0];
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for (i = 0; i < (hinfo->hmask + 1); i++) {
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p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
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for (; p; p = p->tcfc_next) {
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index++;
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if (index < s_i)
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continue;
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a->priv = p;
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a->order = n_i;
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r = (struct rtattr *)skb_tail_pointer(skb);
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RTA_PUT(skb, a->order, 0, NULL);
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err = tcf_action_dump_1(skb, a, 0, 0);
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if (err < 0) {
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index--;
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nlmsg_trim(skb, r);
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goto done;
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}
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r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
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n_i++;
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if (n_i >= TCA_ACT_MAX_PRIO)
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goto done;
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}
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}
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done:
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read_unlock_bh(hinfo->lock);
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if (n_i)
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cb->args[0] += n_i;
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return n_i;
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rtattr_failure:
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nlmsg_trim(skb, r);
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goto done;
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}
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static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
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struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p, *s_p;
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struct rtattr *r ;
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int i= 0, n_i = 0;
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r = (struct rtattr *)skb_tail_pointer(skb);
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RTA_PUT(skb, a->order, 0, NULL);
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RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
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for (i = 0; i < (hinfo->hmask + 1); i++) {
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p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
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while (p != NULL) {
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s_p = p->tcfc_next;
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if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
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module_put(a->ops->owner);
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n_i++;
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p = s_p;
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}
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}
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RTA_PUT(skb, TCA_FCNT, 4, &n_i);
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r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
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return n_i;
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rtattr_failure:
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nlmsg_trim(skb, r);
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return -EINVAL;
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}
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int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
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int type, struct tc_action *a)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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if (type == RTM_DELACTION) {
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return tcf_del_walker(skb, a, hinfo);
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} else if (type == RTM_GETACTION) {
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return tcf_dump_walker(skb, cb, a, hinfo);
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} else {
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printk("tcf_generic_walker: unknown action %d\n", type);
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL(tcf_generic_walker);
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struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p;
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read_lock_bh(hinfo->lock);
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for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
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p = p->tcfc_next) {
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if (p->tcfc_index == index)
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break;
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}
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read_unlock_bh(hinfo->lock);
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return p;
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}
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EXPORT_SYMBOL(tcf_hash_lookup);
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u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
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{
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u32 val = *idx_gen;
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do {
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if (++val == 0)
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val = 1;
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} while (tcf_hash_lookup(val, hinfo));
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return (*idx_gen = val);
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}
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EXPORT_SYMBOL(tcf_hash_new_index);
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int tcf_hash_search(struct tc_action *a, u32 index)
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{
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struct tcf_hashinfo *hinfo = a->ops->hinfo;
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struct tcf_common *p = tcf_hash_lookup(index, hinfo);
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if (p) {
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a->priv = p;
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(tcf_hash_search);
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struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
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struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p = NULL;
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if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
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if (bind) {
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p->tcfc_bindcnt++;
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p->tcfc_refcnt++;
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}
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a->priv = p;
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}
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return p;
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}
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EXPORT_SYMBOL(tcf_hash_check);
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struct tcf_common *tcf_hash_create(u32 index, struct rtattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo)
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{
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struct tcf_common *p = kzalloc(size, GFP_KERNEL);
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if (unlikely(!p))
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return p;
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p->tcfc_refcnt = 1;
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if (bind)
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p->tcfc_bindcnt = 1;
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spin_lock_init(&p->tcfc_lock);
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p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
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p->tcfc_tm.install = jiffies;
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p->tcfc_tm.lastuse = jiffies;
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if (est)
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gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
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&p->tcfc_lock, est);
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a->priv = (void *) p;
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return p;
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}
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EXPORT_SYMBOL(tcf_hash_create);
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void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
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{
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unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
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write_lock_bh(hinfo->lock);
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p->tcfc_next = hinfo->htab[h];
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hinfo->htab[h] = p;
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write_unlock_bh(hinfo->lock);
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}
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EXPORT_SYMBOL(tcf_hash_insert);
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static struct tc_action_ops *act_base = NULL;
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static DEFINE_RWLOCK(act_mod_lock);
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int tcf_register_action(struct tc_action_ops *act)
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{
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struct tc_action_ops *a, **ap;
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write_lock(&act_mod_lock);
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for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
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if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
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write_unlock(&act_mod_lock);
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return -EEXIST;
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}
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}
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act->next = NULL;
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*ap = act;
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write_unlock(&act_mod_lock);
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return 0;
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}
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int tcf_unregister_action(struct tc_action_ops *act)
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{
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struct tc_action_ops *a, **ap;
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int err = -ENOENT;
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write_lock(&act_mod_lock);
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for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
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if (a == act)
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break;
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if (a) {
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*ap = a->next;
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a->next = NULL;
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err = 0;
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}
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write_unlock(&act_mod_lock);
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return err;
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}
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/* lookup by name */
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static struct tc_action_ops *tc_lookup_action_n(char *kind)
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{
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struct tc_action_ops *a = NULL;
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if (kind) {
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read_lock(&act_mod_lock);
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for (a = act_base; a; a = a->next) {
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if (strcmp(kind, a->kind) == 0) {
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if (!try_module_get(a->owner)) {
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read_unlock(&act_mod_lock);
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return NULL;
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}
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break;
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}
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}
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read_unlock(&act_mod_lock);
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}
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return a;
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}
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/* lookup by rtattr */
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static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
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{
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struct tc_action_ops *a = NULL;
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if (kind) {
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read_lock(&act_mod_lock);
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for (a = act_base; a; a = a->next) {
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if (rtattr_strcmp(kind, a->kind) == 0) {
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if (!try_module_get(a->owner)) {
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read_unlock(&act_mod_lock);
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return NULL;
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}
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break;
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}
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}
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read_unlock(&act_mod_lock);
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}
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return a;
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}
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#if 0
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/* lookup by id */
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static struct tc_action_ops *tc_lookup_action_id(u32 type)
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{
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struct tc_action_ops *a = NULL;
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if (type) {
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read_lock(&act_mod_lock);
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for (a = act_base; a; a = a->next) {
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if (a->type == type) {
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if (!try_module_get(a->owner)) {
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read_unlock(&act_mod_lock);
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return NULL;
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}
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break;
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}
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}
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read_unlock(&act_mod_lock);
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}
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return a;
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}
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#endif
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int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
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struct tcf_result *res)
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{
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struct tc_action *a;
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int ret = -1;
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if (skb->tc_verd & TC_NCLS) {
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skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
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ret = TC_ACT_OK;
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goto exec_done;
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}
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while ((a = act) != NULL) {
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repeat:
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if (a->ops && a->ops->act) {
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ret = a->ops->act(skb, a, res);
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if (TC_MUNGED & skb->tc_verd) {
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/* copied already, allow trampling */
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skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
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skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
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}
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if (ret == TC_ACT_REPEAT)
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goto repeat; /* we need a ttl - JHS */
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if (ret != TC_ACT_PIPE)
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goto exec_done;
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}
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act = a->next;
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}
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exec_done:
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return ret;
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}
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void tcf_action_destroy(struct tc_action *act, int bind)
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{
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struct tc_action *a;
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for (a = act; a; a = act) {
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if (a->ops && a->ops->cleanup) {
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if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
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module_put(a->ops->owner);
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act = act->next;
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kfree(a);
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} else { /*FIXME: Remove later - catch insertion bugs*/
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printk("tcf_action_destroy: BUG? destroying NULL ops\n");
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act = act->next;
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kfree(a);
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}
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}
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}
|
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|
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int
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tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
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{
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int err = -EINVAL;
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if (a->ops == NULL || a->ops->dump == NULL)
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return err;
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return a->ops->dump(skb, a, bind, ref);
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}
|
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|
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int
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tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
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{
|
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int err = -EINVAL;
|
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unsigned char *b = skb_tail_pointer(skb);
|
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struct rtattr *r;
|
|
|
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if (a->ops == NULL || a->ops->dump == NULL)
|
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return err;
|
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|
|
RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
|
|
if (tcf_action_copy_stats(skb, a, 0))
|
|
goto rtattr_failure;
|
|
r = (struct rtattr *)skb_tail_pointer(skb);
|
|
RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
|
|
if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
|
|
r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
|
|
return err;
|
|
}
|
|
|
|
rtattr_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
|
|
{
|
|
struct tc_action *a;
|
|
int err = -EINVAL;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct rtattr *r ;
|
|
|
|
while ((a = act) != NULL) {
|
|
r = (struct rtattr *)skb_tail_pointer(skb);
|
|
act = a->next;
|
|
RTA_PUT(skb, a->order, 0, NULL);
|
|
err = tcf_action_dump_1(skb, a, bind, ref);
|
|
if (err < 0)
|
|
goto errout;
|
|
r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rtattr_failure:
|
|
err = -EINVAL;
|
|
errout:
|
|
nlmsg_trim(skb, b);
|
|
return err;
|
|
}
|
|
|
|
struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est,
|
|
char *name, int ovr, int bind, int *err)
|
|
{
|
|
struct tc_action *a;
|
|
struct tc_action_ops *a_o;
|
|
char act_name[IFNAMSIZ];
|
|
struct rtattr *tb[TCA_ACT_MAX+1];
|
|
struct rtattr *kind;
|
|
|
|
*err = -EINVAL;
|
|
|
|
if (name == NULL) {
|
|
if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
|
|
goto err_out;
|
|
kind = tb[TCA_ACT_KIND-1];
|
|
if (kind == NULL)
|
|
goto err_out;
|
|
if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
|
|
goto err_out;
|
|
} else {
|
|
if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
|
|
goto err_out;
|
|
}
|
|
|
|
a_o = tc_lookup_action_n(act_name);
|
|
if (a_o == NULL) {
|
|
#ifdef CONFIG_KMOD
|
|
rtnl_unlock();
|
|
request_module("act_%s", act_name);
|
|
rtnl_lock();
|
|
|
|
a_o = tc_lookup_action_n(act_name);
|
|
|
|
/* We dropped the RTNL semaphore in order to
|
|
* perform the module load. So, even if we
|
|
* succeeded in loading the module we have to
|
|
* tell the caller to replay the request. We
|
|
* indicate this using -EAGAIN.
|
|
*/
|
|
if (a_o != NULL) {
|
|
*err = -EAGAIN;
|
|
goto err_mod;
|
|
}
|
|
#endif
|
|
*err = -ENOENT;
|
|
goto err_out;
|
|
}
|
|
|
|
*err = -ENOMEM;
|
|
a = kzalloc(sizeof(*a), GFP_KERNEL);
|
|
if (a == NULL)
|
|
goto err_mod;
|
|
|
|
/* backward compatibility for policer */
|
|
if (name == NULL)
|
|
*err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
|
|
else
|
|
*err = a_o->init(rta, est, a, ovr, bind);
|
|
if (*err < 0)
|
|
goto err_free;
|
|
|
|
/* module count goes up only when brand new policy is created
|
|
if it exists and is only bound to in a_o->init() then
|
|
ACT_P_CREATED is not returned (a zero is).
|
|
*/
|
|
if (*err != ACT_P_CREATED)
|
|
module_put(a_o->owner);
|
|
a->ops = a_o;
|
|
|
|
*err = 0;
|
|
return a;
|
|
|
|
err_free:
|
|
kfree(a);
|
|
err_mod:
|
|
module_put(a_o->owner);
|
|
err_out:
|
|
return NULL;
|
|
}
|
|
|
|
struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est,
|
|
char *name, int ovr, int bind, int *err)
|
|
{
|
|
struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
|
|
struct tc_action *head = NULL, *act, *act_prev = NULL;
|
|
int i;
|
|
|
|
if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) {
|
|
*err = -EINVAL;
|
|
return head;
|
|
}
|
|
|
|
for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
|
|
act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
|
|
if (act == NULL)
|
|
goto err;
|
|
act->order = i+1;
|
|
|
|
if (head == NULL)
|
|
head = act;
|
|
else
|
|
act_prev->next = act;
|
|
act_prev = act;
|
|
}
|
|
return head;
|
|
|
|
err:
|
|
if (head != NULL)
|
|
tcf_action_destroy(head, bind);
|
|
return NULL;
|
|
}
|
|
|
|
int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
|
|
int compat_mode)
|
|
{
|
|
int err = 0;
|
|
struct gnet_dump d;
|
|
struct tcf_act_hdr *h = a->priv;
|
|
|
|
if (h == NULL)
|
|
goto errout;
|
|
|
|
/* compat_mode being true specifies a call that is supposed
|
|
* to add additional backward compatiblity statistic TLVs.
|
|
*/
|
|
if (compat_mode) {
|
|
if (a->type == TCA_OLD_COMPAT)
|
|
err = gnet_stats_start_copy_compat(skb, 0,
|
|
TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
|
|
else
|
|
return 0;
|
|
} else
|
|
err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
|
|
&h->tcf_lock, &d);
|
|
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
if (a->ops != NULL && a->ops->get_stats != NULL)
|
|
if (a->ops->get_stats(skb, a) < 0)
|
|
goto errout;
|
|
|
|
if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
|
|
gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
|
|
gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
|
|
goto errout;
|
|
|
|
if (gnet_stats_finish_copy(&d) < 0)
|
|
goto errout;
|
|
|
|
return 0;
|
|
|
|
errout:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
|
|
u16 flags, int event, int bind, int ref)
|
|
{
|
|
struct tcamsg *t;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct rtattr *x;
|
|
|
|
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
|
|
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
x = (struct rtattr *)skb_tail_pointer(skb);
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
if (tcf_action_dump(skb, a, bind, ref) < 0)
|
|
goto rtattr_failure;
|
|
|
|
x->rta_len = skb_tail_pointer(skb) - (u8 *)x;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return rtnl_unicast(skb, pid);
|
|
}
|
|
|
|
static struct tc_action *
|
|
tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
|
|
{
|
|
struct rtattr *tb[TCA_ACT_MAX+1];
|
|
struct tc_action *a;
|
|
int index;
|
|
|
|
*err = -EINVAL;
|
|
if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
|
|
return NULL;
|
|
|
|
if (tb[TCA_ACT_INDEX - 1] == NULL ||
|
|
RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
|
|
return NULL;
|
|
index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
|
|
|
|
*err = -ENOMEM;
|
|
a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
|
|
if (a == NULL)
|
|
return NULL;
|
|
|
|
*err = -EINVAL;
|
|
a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
|
|
if (a->ops == NULL)
|
|
goto err_free;
|
|
if (a->ops->lookup == NULL)
|
|
goto err_mod;
|
|
*err = -ENOENT;
|
|
if (a->ops->lookup(a, index) == 0)
|
|
goto err_mod;
|
|
|
|
module_put(a->ops->owner);
|
|
*err = 0;
|
|
return a;
|
|
err_mod:
|
|
module_put(a->ops->owner);
|
|
err_free:
|
|
kfree(a);
|
|
return NULL;
|
|
}
|
|
|
|
static void cleanup_a(struct tc_action *act)
|
|
{
|
|
struct tc_action *a;
|
|
|
|
for (a = act; a; a = act) {
|
|
act = a->next;
|
|
kfree(a);
|
|
}
|
|
}
|
|
|
|
static struct tc_action *create_a(int i)
|
|
{
|
|
struct tc_action *act;
|
|
|
|
act = kzalloc(sizeof(*act), GFP_KERNEL);
|
|
if (act == NULL) {
|
|
printk("create_a: failed to alloc!\n");
|
|
return NULL;
|
|
}
|
|
act->order = i;
|
|
return act;
|
|
}
|
|
|
|
static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned char *b;
|
|
struct nlmsghdr *nlh;
|
|
struct tcamsg *t;
|
|
struct netlink_callback dcb;
|
|
struct rtattr *x;
|
|
struct rtattr *tb[TCA_ACT_MAX+1];
|
|
struct rtattr *kind;
|
|
struct tc_action *a = create_a(0);
|
|
int err = -EINVAL;
|
|
|
|
if (a == NULL) {
|
|
printk("tca_action_flush: couldnt create tc_action\n");
|
|
return err;
|
|
}
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
printk("tca_action_flush: failed skb alloc\n");
|
|
kfree(a);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
b = skb_tail_pointer(skb);
|
|
|
|
if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
|
|
goto err_out;
|
|
|
|
kind = tb[TCA_ACT_KIND-1];
|
|
a->ops = tc_lookup_action(kind);
|
|
if (a->ops == NULL)
|
|
goto err_out;
|
|
|
|
nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
x = (struct rtattr *)skb_tail_pointer(skb);
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
|
|
if (err < 0)
|
|
goto rtattr_failure;
|
|
|
|
x->rta_len = skb_tail_pointer(skb) - (u8 *)x;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
nlh->nlmsg_flags |= NLM_F_ROOT;
|
|
module_put(a->ops->owner);
|
|
kfree(a);
|
|
err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
|
|
if (err > 0)
|
|
return 0;
|
|
|
|
return err;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
module_put(a->ops->owner);
|
|
err_out:
|
|
kfree_skb(skb);
|
|
kfree(a);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
|
|
{
|
|
int i, ret = 0;
|
|
struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
|
|
struct tc_action *head = NULL, *act, *act_prev = NULL;
|
|
|
|
if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
|
|
return -EINVAL;
|
|
|
|
if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
|
|
if (tb[0] != NULL && tb[1] == NULL)
|
|
return tca_action_flush(tb[0], n, pid);
|
|
}
|
|
|
|
for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
|
|
act = tcf_action_get_1(tb[i], n, pid, &ret);
|
|
if (act == NULL)
|
|
goto err;
|
|
act->order = i+1;
|
|
|
|
if (head == NULL)
|
|
head = act;
|
|
else
|
|
act_prev->next = act;
|
|
act_prev = act;
|
|
}
|
|
|
|
if (event == RTM_GETACTION)
|
|
ret = act_get_notify(pid, n, head, event);
|
|
else { /* delete */
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
ret = -ENOBUFS;
|
|
goto err;
|
|
}
|
|
|
|
if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
|
|
0, 1) <= 0) {
|
|
kfree_skb(skb);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/* now do the delete */
|
|
tcf_action_destroy(head, 0);
|
|
ret = rtnetlink_send(skb, pid, RTNLGRP_TC,
|
|
n->nlmsg_flags&NLM_F_ECHO);
|
|
if (ret > 0)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
err:
|
|
cleanup_a(head);
|
|
return ret;
|
|
}
|
|
|
|
static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
|
|
u16 flags)
|
|
{
|
|
struct tcamsg *t;
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
struct rtattr *x;
|
|
unsigned char *b;
|
|
int err = 0;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
b = skb_tail_pointer(skb);
|
|
|
|
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
x = (struct rtattr *)skb_tail_pointer(skb);
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
if (tcf_action_dump(skb, a, 0, 0) < 0)
|
|
goto rtattr_failure;
|
|
|
|
x->rta_len = skb_tail_pointer(skb) - (u8 *)x;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
NETLINK_CB(skb).dst_group = RTNLGRP_TC;
|
|
|
|
err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
|
|
if (err > 0)
|
|
err = 0;
|
|
return err;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int
|
|
tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
|
|
{
|
|
int ret = 0;
|
|
struct tc_action *act;
|
|
struct tc_action *a;
|
|
u32 seq = n->nlmsg_seq;
|
|
|
|
act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
|
|
if (act == NULL)
|
|
goto done;
|
|
|
|
/* dump then free all the actions after update; inserted policy
|
|
* stays intact
|
|
* */
|
|
ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
|
|
for (a = act; a; a = act) {
|
|
act = a->next;
|
|
kfree(a);
|
|
}
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
|
|
{
|
|
struct rtattr **tca = arg;
|
|
u32 pid = skb ? NETLINK_CB(skb).pid : 0;
|
|
int ret = 0, ovr = 0;
|
|
|
|
if (tca[TCA_ACT_TAB-1] == NULL) {
|
|
printk("tc_ctl_action: received NO action attribs\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* n->nlmsg_flags&NLM_F_CREATE
|
|
* */
|
|
switch (n->nlmsg_type) {
|
|
case RTM_NEWACTION:
|
|
/* we are going to assume all other flags
|
|
* imply create only if it doesnt exist
|
|
* Note that CREATE | EXCL implies that
|
|
* but since we want avoid ambiguity (eg when flags
|
|
* is zero) then just set this
|
|
*/
|
|
if (n->nlmsg_flags&NLM_F_REPLACE)
|
|
ovr = 1;
|
|
replay:
|
|
ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
|
|
if (ret == -EAGAIN)
|
|
goto replay;
|
|
break;
|
|
case RTM_DELACTION:
|
|
ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
|
|
break;
|
|
case RTM_GETACTION:
|
|
ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct rtattr *
|
|
find_dump_kind(struct nlmsghdr *n)
|
|
{
|
|
struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
|
|
struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
|
|
struct rtattr *rta[TCAA_MAX + 1];
|
|
struct rtattr *kind;
|
|
int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
|
|
int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
|
|
struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
|
|
|
|
if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
|
|
return NULL;
|
|
tb1 = rta[TCA_ACT_TAB - 1];
|
|
if (tb1 == NULL)
|
|
return NULL;
|
|
|
|
if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
|
|
NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
|
|
return NULL;
|
|
if (tb[0] == NULL)
|
|
return NULL;
|
|
|
|
if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
|
|
RTA_PAYLOAD(tb[0])) < 0)
|
|
return NULL;
|
|
kind = tb2[TCA_ACT_KIND-1];
|
|
|
|
return kind;
|
|
}
|
|
|
|
static int
|
|
tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct rtattr *x;
|
|
struct tc_action_ops *a_o;
|
|
struct tc_action a;
|
|
int ret = 0;
|
|
struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
|
|
struct rtattr *kind = find_dump_kind(cb->nlh);
|
|
|
|
if (kind == NULL) {
|
|
printk("tc_dump_action: action bad kind\n");
|
|
return 0;
|
|
}
|
|
|
|
a_o = tc_lookup_action(kind);
|
|
if (a_o == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
memset(&a, 0, sizeof(struct tc_action));
|
|
a.ops = a_o;
|
|
|
|
if (a_o->walk == NULL) {
|
|
printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
|
|
cb->nlh->nlmsg_type, sizeof(*t));
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
t->tca__pad1 = 0;
|
|
t->tca__pad2 = 0;
|
|
|
|
x = (struct rtattr *)skb_tail_pointer(skb);
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
|
|
if (ret < 0)
|
|
goto rtattr_failure;
|
|
|
|
if (ret > 0) {
|
|
x->rta_len = skb_tail_pointer(skb) - (u8 *)x;
|
|
ret = skb->len;
|
|
} else
|
|
nlmsg_trim(skb, x);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
if (NETLINK_CB(cb->skb).pid && ret)
|
|
nlh->nlmsg_flags |= NLM_F_MULTI;
|
|
module_put(a_o->owner);
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
module_put(a_o->owner);
|
|
nlmsg_trim(skb, b);
|
|
return skb->len;
|
|
}
|
|
|
|
static int __init tc_action_init(void)
|
|
{
|
|
rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(tc_action_init);
|
|
|
|
EXPORT_SYMBOL(tcf_register_action);
|
|
EXPORT_SYMBOL(tcf_unregister_action);
|
|
EXPORT_SYMBOL(tcf_action_exec);
|
|
EXPORT_SYMBOL(tcf_action_dump_1);
|