1058 lines
22 KiB
C
1058 lines
22 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 <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <net/sock.h>
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#include <net/sch_generic.h>
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#include <net/act_api.h>
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#if 1 /* control */
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#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define DPRINTK(format,args...)
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#endif
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#if 0 /* data */
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#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define D2PRINTK(format,args...)
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#endif
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static struct tc_action_ops *act_base = NULL;
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static rwlock_t act_mod_lock = RW_LOCK_UNLOCKED;
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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 (strcmp((char*)RTA_DATA(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, 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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D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n",skb,skb->input_dev?skb->input_dev->name:"xxx",skb->dev->name);
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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);
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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_PIPE)
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goto exec_done;
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if (ret == TC_ACT_REPEAT)
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goto repeat; /* we need a ttl - JHS */
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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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if (skb->tc_classid > 0) {
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res->classid = skb->tc_classid;
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res->class = 0;
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skb->tc_classid = 0;
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}
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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; act; a = act) {
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if (a && a->ops && a->ops->cleanup) {
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DPRINTK("tcf_action_destroy destroying %p next %p\n", a,a->next?a->next:NULL);
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act = act->next;
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if (ACT_P_DELETED == a->ops->cleanup(a, bind)) {
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module_put(a->ops->owner);
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}
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a->ops = NULL;
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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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if (a) {
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act = act->next;
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kfree(a);
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} else {
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printk("tcf_action_destroy: BUG? destroying NULL action! \n");
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break;
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}
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}
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}
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}
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int 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 ( (NULL == a) || (NULL == a->ops)
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|| (NULL == a->ops->dump) )
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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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int 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;
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struct rtattr *r;
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if ( (NULL == a) || (NULL == a->ops)
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|| (NULL == a->ops->dump) || (NULL == a->ops->kind))
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return err;
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RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
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if (tcf_action_copy_stats(skb,a))
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goto rtattr_failure;
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r = (struct rtattr*) skb->tail;
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RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
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if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
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r->rta_len = skb->tail - (u8*)r;
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return err;
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}
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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int tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
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{
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struct tc_action *a;
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int err = -EINVAL;
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unsigned char *b = skb->tail;
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struct rtattr *r ;
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while ((a = act) != NULL) {
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r = (struct rtattr*) skb->tail;
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act = a->next;
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RTA_PUT(skb, a->order, 0, NULL);
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err = tcf_action_dump_1(skb, a, bind, ref);
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if (0 > err)
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goto rtattr_failure;
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r->rta_len = skb->tail - (u8*)r;
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}
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return 0;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -err;
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}
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int tcf_action_init_1(struct rtattr *rta, struct rtattr *est, struct tc_action *a, char *name, int ovr, int bind )
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{
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struct tc_action_ops *a_o;
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char act_name[4 + IFNAMSIZ + 1];
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struct rtattr *tb[TCA_ACT_MAX+1];
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struct rtattr *kind = NULL;
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int err = -EINVAL;
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if (NULL == name) {
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if (rtattr_parse(tb, TCA_ACT_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta))<0)
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goto err_out;
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kind = tb[TCA_ACT_KIND-1];
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if (NULL != kind) {
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sprintf(act_name, "%s", (char*)RTA_DATA(kind));
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if (RTA_PAYLOAD(kind) >= IFNAMSIZ) {
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printk(" Action %s bad\n", (char*)RTA_DATA(kind));
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goto err_out;
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}
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} else {
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printk("Action bad kind\n");
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goto err_out;
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}
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a_o = tc_lookup_action(kind);
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} else {
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sprintf(act_name, "%s", name);
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DPRINTK("tcf_action_init_1: finding %s\n",act_name);
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a_o = tc_lookup_action_n(name);
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}
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#ifdef CONFIG_KMOD
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if (NULL == a_o) {
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DPRINTK("tcf_action_init_1: trying to load module %s\n",act_name);
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request_module (act_name);
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a_o = tc_lookup_action_n(act_name);
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}
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#endif
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if (NULL == a_o) {
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printk("failed to find %s\n",act_name);
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goto err_out;
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}
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if (NULL == a) {
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goto err_mod;
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}
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/* backward compatibility for policer */
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if (NULL == name) {
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err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
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if (0 > err ) {
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err = -EINVAL;
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goto err_mod;
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}
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} else {
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err = a_o->init(rta, est, a, ovr, bind);
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if (0 > err ) {
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err = -EINVAL;
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goto err_mod;
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}
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}
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/* module count goes up only when brand new policy is created
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if it exists and is only bound to in a_o->init() then
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ACT_P_CREATED is not returned (a zero is).
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*/
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if (ACT_P_CREATED != err) {
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module_put(a_o->owner);
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}
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a->ops = a_o;
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DPRINTK("tcf_action_init_1: successfull %s \n",act_name);
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return 0;
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err_mod:
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module_put(a_o->owner);
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err_out:
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return err;
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}
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int tcf_action_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a, char *name, int ovr , int bind)
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{
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struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
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int i;
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struct tc_action *act = a, *a_s = a;
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int err = -EINVAL;
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if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(rta), RTA_PAYLOAD(rta))<0)
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return err;
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for (i=0; i < TCA_ACT_MAX_PRIO ; i++) {
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if (tb[i]) {
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if (NULL == act) {
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act = kmalloc(sizeof(*act),GFP_KERNEL);
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if (NULL == act) {
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err = -ENOMEM;
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goto bad_ret;
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}
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memset(act, 0,sizeof(*act));
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}
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act->next = NULL;
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if (0 > tcf_action_init_1(tb[i],est,act,name,ovr,bind)) {
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printk("Error processing action order %d\n",i);
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return err;
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}
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act->order = i+1;
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if (a_s != act) {
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a_s->next = act;
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a_s = act;
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}
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act = NULL;
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}
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}
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return 0;
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bad_ret:
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tcf_action_destroy(a, bind);
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return err;
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}
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int tcf_action_copy_stats (struct sk_buff *skb,struct tc_action *a)
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{
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int err;
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struct gnet_dump d;
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struct tcf_act_hdr *h = a->priv;
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#ifdef CONFIG_KMOD
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/* place holder */
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#endif
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if (NULL == h)
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goto errout;
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if (a->type == TCA_OLD_COMPAT)
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err = gnet_stats_start_copy_compat(skb, TCA_ACT_STATS,
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TCA_STATS, TCA_XSTATS, h->stats_lock, &d);
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else
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err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
|
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h->stats_lock, &d);
|
|
|
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if (err < 0)
|
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goto errout;
|
|
|
|
if (NULL != a->ops && NULL != a->ops->get_stats)
|
|
if (a->ops->get_stats(skb, a) < 0)
|
|
goto errout;
|
|
|
|
if (gnet_stats_copy_basic(&d, &h->bstats) < 0 ||
|
|
#ifdef CONFIG_NET_ESTIMATOR
|
|
gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 ||
|
|
#endif
|
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gnet_stats_copy_queue(&d, &h->qstats) < 0)
|
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goto errout;
|
|
|
|
if (gnet_stats_finish_copy(&d) < 0)
|
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goto errout;
|
|
|
|
return 0;
|
|
|
|
errout:
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int
|
|
tca_get_fill(struct sk_buff *skb, struct tc_action *a,
|
|
u32 pid, u32 seq, unsigned flags, int event, int bind, int ref)
|
|
{
|
|
struct tcamsg *t;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb->tail;
|
|
struct rtattr *x;
|
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t));
|
|
nlh->nlmsg_flags = flags;
|
|
t = NLMSG_DATA(nlh);
|
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t->tca_family = AF_UNSPEC;
|
|
|
|
x = (struct rtattr*) skb->tail;
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
if (0 > tcf_action_dump(skb, a, bind, ref)) {
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
x->rta_len = skb->tail - (u8*)x;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
static int act_get_notify(u32 pid, struct nlmsghdr *n,
|
|
struct tc_action *a, int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
int err = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
err = netlink_unicast(rtnl,skb, pid, MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
static int tcf_action_get_1(struct rtattr *rta, struct tc_action *a, struct nlmsghdr *n, u32 pid)
|
|
{
|
|
struct tc_action_ops *a_o;
|
|
char act_name[4 + IFNAMSIZ + 1];
|
|
struct rtattr *tb[TCA_ACT_MAX+1];
|
|
struct rtattr *kind = NULL;
|
|
int index;
|
|
|
|
int err = -EINVAL;
|
|
|
|
if (rtattr_parse(tb, TCA_ACT_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta))<0)
|
|
goto err_out;
|
|
|
|
|
|
kind = tb[TCA_ACT_KIND-1];
|
|
if (NULL != kind) {
|
|
sprintf(act_name, "%s", (char*)RTA_DATA(kind));
|
|
if (RTA_PAYLOAD(kind) >= IFNAMSIZ) {
|
|
printk("tcf_action_get_1: action %s bad\n", (char*)RTA_DATA(kind));
|
|
goto err_out;
|
|
}
|
|
|
|
} else {
|
|
printk("tcf_action_get_1: action bad kind\n");
|
|
goto err_out;
|
|
}
|
|
|
|
if (tb[TCA_ACT_INDEX - 1]) {
|
|
index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
|
|
} else {
|
|
printk("tcf_action_get_1: index not received\n");
|
|
goto err_out;
|
|
}
|
|
|
|
a_o = tc_lookup_action(kind);
|
|
#ifdef CONFIG_KMOD
|
|
if (NULL == a_o) {
|
|
request_module (act_name);
|
|
a_o = tc_lookup_action_n(act_name);
|
|
}
|
|
|
|
#endif
|
|
if (NULL == a_o) {
|
|
printk("failed to find %s\n",act_name);
|
|
goto err_out;
|
|
}
|
|
|
|
if (NULL == a) {
|
|
goto err_mod;
|
|
}
|
|
|
|
a->ops = a_o;
|
|
|
|
if (NULL == a_o->lookup || 0 == a_o->lookup(a, index)) {
|
|
a->ops = NULL;
|
|
err = -EINVAL;
|
|
goto err_mod;
|
|
}
|
|
|
|
module_put(a_o->owner);
|
|
return 0;
|
|
err_mod:
|
|
module_put(a_o->owner);
|
|
err_out:
|
|
return err;
|
|
}
|
|
|
|
static void cleanup_a (struct tc_action *act)
|
|
{
|
|
struct tc_action *a;
|
|
|
|
for (a = act; act; a = act) {
|
|
if (a) {
|
|
act = act->next;
|
|
a->ops = NULL;
|
|
a->priv = NULL;
|
|
kfree(a);
|
|
} else {
|
|
printk("cleanup_a: BUG? empty action\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct tc_action_ops *get_ao(struct rtattr *kind, struct tc_action *a)
|
|
{
|
|
char act_name[4 + IFNAMSIZ + 1];
|
|
struct tc_action_ops *a_o = NULL;
|
|
|
|
if (NULL != kind) {
|
|
sprintf(act_name, "%s", (char*)RTA_DATA(kind));
|
|
if (RTA_PAYLOAD(kind) >= IFNAMSIZ) {
|
|
printk("get_ao: action %s bad\n", (char*)RTA_DATA(kind));
|
|
return NULL;
|
|
}
|
|
|
|
} else {
|
|
printk("get_ao: action bad kind\n");
|
|
return NULL;
|
|
}
|
|
|
|
a_o = tc_lookup_action(kind);
|
|
#ifdef CONFIG_KMOD
|
|
if (NULL == a_o) {
|
|
DPRINTK("get_ao: trying to load module %s\n",act_name);
|
|
request_module (act_name);
|
|
a_o = tc_lookup_action_n(act_name);
|
|
}
|
|
#endif
|
|
|
|
if (NULL == a_o) {
|
|
printk("get_ao: failed to find %s\n",act_name);
|
|
return NULL;
|
|
}
|
|
|
|
a->ops = a_o;
|
|
return a_o;
|
|
}
|
|
|
|
static struct tc_action *create_a(int i)
|
|
{
|
|
struct tc_action *act = NULL;
|
|
|
|
act = kmalloc(sizeof(*act),GFP_KERNEL);
|
|
if (NULL == act) { /* grrr .. */
|
|
printk("create_a: failed to alloc! \n");
|
|
return NULL;
|
|
}
|
|
|
|
memset(act, 0,sizeof(*act));
|
|
|
|
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 = NULL;
|
|
struct tc_action *a = create_a(0);
|
|
int err = -EINVAL;
|
|
|
|
if (NULL == a) {
|
|
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 = (unsigned char *)skb->tail;
|
|
|
|
if (rtattr_parse(tb, TCA_ACT_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta))<0) {
|
|
goto err_out;
|
|
}
|
|
|
|
kind = tb[TCA_ACT_KIND-1];
|
|
if (NULL == get_ao(kind, a)) {
|
|
goto err_out;
|
|
}
|
|
|
|
nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof (*t));
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
|
|
x = (struct rtattr *) skb->tail;
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
|
|
if (0 > err ) {
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
x->rta_len = skb->tail - (u8 *) x;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
nlh->nlmsg_flags |= NLM_F_ROOT;
|
|
module_put(a->ops->owner);
|
|
kfree(a);
|
|
err = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
|
|
if (err > 0)
|
|
return 0;
|
|
|
|
return err;
|
|
|
|
|
|
rtattr_failure:
|
|
module_put(a->ops->owner);
|
|
nlmsg_failure:
|
|
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 s = 0;
|
|
int i, ret = 0;
|
|
struct tc_action *act = NULL;
|
|
struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
|
|
struct tc_action *a = NULL, *a_s = NULL;
|
|
|
|
if (event != RTM_GETACTION && event != RTM_DELACTION)
|
|
ret = -EINVAL;
|
|
|
|
if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(rta), RTA_PAYLOAD(rta))<0) {
|
|
ret = -EINVAL;
|
|
goto nlmsg_failure;
|
|
}
|
|
|
|
if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
|
|
if (NULL != tb[0] && NULL == tb[1]) {
|
|
return tca_action_flush(tb[0],n,pid);
|
|
}
|
|
}
|
|
|
|
for (i=0; i < TCA_ACT_MAX_PRIO ; i++) {
|
|
|
|
if (NULL == tb[i])
|
|
break;
|
|
|
|
act = create_a(i+1);
|
|
if (NULL != a && a != act) {
|
|
a->next = act;
|
|
a = act;
|
|
} else {
|
|
a = act;
|
|
}
|
|
|
|
if (!s) {
|
|
s = 1;
|
|
a_s = a;
|
|
}
|
|
|
|
ret = tcf_action_get_1(tb[i],act,n,pid);
|
|
if (ret < 0) {
|
|
printk("tcf_action_get: failed to get! \n");
|
|
ret = -EINVAL;
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
if (RTM_GETACTION == event) {
|
|
ret = act_get_notify(pid, n, a_s, event);
|
|
} else { /* delete */
|
|
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
ret = -ENOBUFS;
|
|
goto nlmsg_failure;
|
|
}
|
|
|
|
if (tca_get_fill(skb, a_s, pid, n->nlmsg_seq, 0, event, 0 , 1) <= 0) {
|
|
kfree_skb(skb);
|
|
ret = -EINVAL;
|
|
goto nlmsg_failure;
|
|
}
|
|
|
|
/* now do the delete */
|
|
tcf_action_destroy(a_s, 0);
|
|
|
|
ret = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
|
|
if (ret > 0)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
cleanup_a(a_s);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, unsigned 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 = (unsigned char *)skb->tail;
|
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t));
|
|
nlh->nlmsg_flags = flags;
|
|
t = NLMSG_DATA(nlh);
|
|
t->tca_family = AF_UNSPEC;
|
|
|
|
x = (struct rtattr*) skb->tail;
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
if (0 > tcf_action_dump(skb, a, 0, 0)) {
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
x->rta_len = skb->tail - (u8*)x;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
NETLINK_CB(skb).dst_groups = RTMGRP_TC;
|
|
|
|
err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO);
|
|
if (err > 0)
|
|
err = 0;
|
|
|
|
return err;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr )
|
|
{
|
|
int ret = 0;
|
|
struct tc_action *act = NULL;
|
|
struct tc_action *a = NULL;
|
|
u32 seq = n->nlmsg_seq;
|
|
|
|
act = kmalloc(sizeof(*act),GFP_KERNEL);
|
|
if (NULL == act)
|
|
return -ENOMEM;
|
|
|
|
memset(act, 0, sizeof(*act));
|
|
|
|
ret = tcf_action_init(rta, NULL,act,NULL,ovr,0);
|
|
/* NOTE: We have an all-or-none model
|
|
* This means that of any of the actions fail
|
|
* to update then all are undone.
|
|
* */
|
|
if (0 > ret) {
|
|
tcf_action_destroy(act, 0);
|
|
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; act; a = act) {
|
|
if (a) {
|
|
act = act->next;
|
|
a->ops = NULL;
|
|
a->priv = NULL;
|
|
kfree(a);
|
|
} else {
|
|
printk("tcf_action_add: BUG? empty action\n");
|
|
}
|
|
}
|
|
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 (NULL == tca[TCA_ACT_TAB-1]) {
|
|
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;
|
|
}
|
|
ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
|
|
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:
|
|
printk(" Unknown cmd was detected\n");
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static char *
|
|
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 = NULL;
|
|
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 (NULL == tb1) {
|
|
return NULL;
|
|
}
|
|
|
|
if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
|
|
return NULL;
|
|
if (NULL == tb[0])
|
|
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 (char *) RTA_DATA(kind);
|
|
}
|
|
|
|
static int
|
|
tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb->tail;
|
|
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);
|
|
char *kind = find_dump_kind(cb->nlh);
|
|
if (NULL == kind) {
|
|
printk("tc_dump_action: action bad kind\n");
|
|
return 0;
|
|
}
|
|
|
|
a_o = tc_lookup_action_n(kind);
|
|
|
|
if (NULL == a_o) {
|
|
printk("failed to find %s\n", kind);
|
|
return 0;
|
|
}
|
|
|
|
memset(&a,0,sizeof(struct tc_action));
|
|
a.ops = a_o;
|
|
|
|
if (NULL == a_o->walk) {
|
|
printk("tc_dump_action: %s !capable of dumping table\n",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;
|
|
|
|
x = (struct rtattr *) skb->tail;
|
|
RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
|
|
|
|
ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
|
|
if (0 > ret ) {
|
|
goto rtattr_failure;
|
|
}
|
|
|
|
if (ret > 0) {
|
|
x->rta_len = skb->tail - (u8 *) x;
|
|
ret = skb->len;
|
|
} else {
|
|
skb_trim(skb, (u8*)x - skb->data);
|
|
}
|
|
|
|
nlh->nlmsg_len = skb->tail - 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);
|
|
skb_trim(skb, b - skb->data);
|
|
return skb->len;
|
|
}
|
|
|
|
static int __init tc_action_init(void)
|
|
{
|
|
struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
|
|
|
|
if (link_p) {
|
|
link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
|
|
link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
|
|
link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
|
|
link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
|
|
}
|
|
|
|
printk("TC classifier action (bugs to netdev@oss.sgi.com cc hadi@cyberus.ca)\n");
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(tc_action_init);
|
|
|
|
EXPORT_SYMBOL(tcf_register_action);
|
|
EXPORT_SYMBOL(tcf_unregister_action);
|
|
EXPORT_SYMBOL(tcf_action_init_1);
|
|
EXPORT_SYMBOL(tcf_action_init);
|
|
EXPORT_SYMBOL(tcf_action_destroy);
|
|
EXPORT_SYMBOL(tcf_action_exec);
|
|
EXPORT_SYMBOL(tcf_action_copy_stats);
|
|
EXPORT_SYMBOL(tcf_action_dump);
|
|
EXPORT_SYMBOL(tcf_action_dump_1);
|
|
EXPORT_SYMBOL(tcf_action_dump_old);
|