--- /dev/null
+/*
+ * net/sched/act_api.c Packet action API.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Author: Jamal Hadi Salim
+ *
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+
+#if 1 /* control */
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+#if 0 /* data */
+#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define D2PRINTK(format,args...)
+#endif
+
+static struct tc_action_ops *act_base = NULL;
+static rwlock_t act_mod_lock = RW_LOCK_UNLOCKED;
+
+int tcf_register_action(struct tc_action_ops *act)
+{
+ struct tc_action_ops *a, **ap;
+
+ write_lock(&act_mod_lock);
+ for (ap = &act_base; (a=*ap)!=NULL; ap = &a->next) {
+ if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
+ write_unlock(&act_mod_lock);
+ return -EEXIST;
+ }
+ }
+
+ act->next = NULL;
+ *ap = act;
+
+ write_unlock(&act_mod_lock);
+
+ return 0;
+}
+
+int tcf_unregister_action(struct tc_action_ops *act)
+{
+ struct tc_action_ops *a, **ap;
+ int err = -ENOENT;
+
+ write_lock(&act_mod_lock);
+ for (ap = &act_base; (a=*ap)!=NULL; ap = &a->next)
+ if(a == act)
+ break;
+
+ if (a) {
+ *ap = a->next;
+ a->next = NULL;
+ err = 0;
+ }
+ write_unlock(&act_mod_lock);
+ return err;
+}
+
+/* lookup by name */
+struct tc_action_ops *tc_lookup_action_n(char *kind)
+{
+
+ struct tc_action_ops *a = NULL;
+
+ if (kind) {
+ read_lock(&act_mod_lock);
+ for (a = act_base; a; a = a->next) {
+ if (strcmp(kind,a->kind) == 0) {
+ if (!try_module_get(a->owner)) {
+ read_unlock(&act_mod_lock);
+ return NULL;
+ }
+ break;
+ }
+ }
+ read_unlock(&act_mod_lock);
+ }
+
+ return a;
+}
+
+/* lookup by rtattr */
+struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
+{
+
+ struct tc_action_ops *a = NULL;
+
+ if (kind) {
+ read_lock(&act_mod_lock);
+ for (a = act_base; a; a = a->next) {
+
+ if (strcmp((char*)RTA_DATA(kind),a->kind) == 0){
+ if (!try_module_get(a->owner)) {
+ read_unlock(&act_mod_lock);
+ return NULL;
+ }
+ break;
+ }
+ }
+ read_unlock(&act_mod_lock);
+ }
+
+ return a;
+}
+
+/* lookup by id */
+struct tc_action_ops *tc_lookup_action_id(u32 type)
+{
+ struct tc_action_ops *a = NULL;
+
+ if (type) {
+ read_lock(&act_mod_lock);
+ for (a = act_base; a; a = a->next) {
+ if (a->type == type) {
+ if (!try_module_get(a->owner)) {
+ read_unlock(&act_mod_lock);
+ return NULL;
+ }
+ break;
+ }
+ }
+ read_unlock(&act_mod_lock);
+ }
+
+ return a;
+}
+
+int tcf_action_exec(struct sk_buff *skb,struct tc_action *act)
+{
+
+ struct tc_action *a;
+ int ret = -1;
+
+ if (skb->tc_verd & TC_NCLS) {
+ skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
+ 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);
+ return TC_ACT_OK;
+ }
+ while ((a = act) != NULL) {
+repeat:
+ if (a->ops && a->ops->act) {
+ ret = a->ops->act(&skb,a);
+ if (TC_MUNGED & skb->tc_verd) {
+ /* copied already, allow trampling */
+ skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
+ skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
+ }
+
+ if (ret != TC_ACT_PIPE)
+ goto exec_done;
+ if (ret == TC_ACT_REPEAT)
+ goto repeat; /* we need a ttl - JHS */
+
+ }
+ act = a->next;
+ }
+
+exec_done:
+
+ return ret;
+}
+
+void tcf_action_destroy(struct tc_action *act, int bind)
+{
+ struct tc_action *a;
+
+ for (a = act; act; a = act) {
+ if (a && a->ops && a->ops->cleanup) {
+ DPRINTK("tcf_action_destroy destroying %p next %p\n", a,a->next?a->next:NULL);
+ act = act->next;
+ if (ACT_P_DELETED == a->ops->cleanup(a, bind)) {
+ module_put(a->ops->owner);
+ }
+
+ a->ops = NULL;
+ kfree(a);
+ } else { /*FIXME: Remove later - catch insertion bugs*/
+ printk("tcf_action_destroy: BUG? destroying NULL ops \n");
+ if (a) {
+ act = act->next;
+ kfree(a);
+ } else {
+ printk("tcf_action_destroy: BUG? destroying NULL action! \n");
+ break;
+ }
+ }
+ }
+}
+
+int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+ int err = -EINVAL;
+
+
+ if ( (NULL == a) || (NULL == a->ops)
+ || (NULL == a->ops->dump) )
+ return err;
+ return a->ops->dump(skb, a, bind, ref);
+
+}
+
+
+int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+ int err = -EINVAL;
+ unsigned char *b = skb->tail;
+ struct rtattr *r;
+
+
+ if ( (NULL == a) || (NULL == a->ops)
+ || (NULL == a->ops->dump) || (NULL == a->ops->kind))
+ return err;
+
+
+ RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
+ if (tcf_action_copy_stats(skb,a))
+ goto rtattr_failure;
+ r = (struct rtattr*) skb->tail;
+ RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+ if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
+ r->rta_len = skb->tail - (u8*)r;
+ return err;
+ }
+
+
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ 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;
+ struct rtattr *r ;
+
+ while ((a = act) != NULL) {
+ r = (struct rtattr*) skb->tail;
+ act = a->next;
+ RTA_PUT(skb, a->order, 0, NULL);
+ err = tcf_action_dump_1(skb, a, bind, ref);
+ if (0 > err)
+ goto rtattr_failure;
+
+ r->rta_len = skb->tail - (u8*)r;
+ }
+
+ return 0;
+
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -err;
+
+}
+
+int tcf_action_init_1(struct rtattr *rta, struct rtattr *est, struct tc_action *a, char *name, int ovr, int bind )
+{
+ struct tc_action_ops *a_o;
+ char act_name[4 + IFNAMSIZ + 1];
+ struct rtattr *tb[TCA_ACT_MAX+1];
+ struct rtattr *kind = NULL;
+
+ int err = -EINVAL;
+
+ if (NULL == name) {
+ 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(" Action %s bad\n", (char*)RTA_DATA(kind));
+ goto err_out;
+ }
+
+ } else {
+ printk("Action bad kind\n");
+ goto err_out;
+ }
+ a_o = tc_lookup_action(kind);
+ } else {
+ sprintf(act_name, "%s", name);
+ DPRINTK("tcf_action_init_1: finding %s\n",act_name);
+ a_o = tc_lookup_action_n(name);
+ }
+#ifdef CONFIG_KMOD
+ if (NULL == a_o) {
+ DPRINTK("tcf_action_init_1: 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("failed to find %s\n",act_name);
+ goto err_out;
+ }
+
+ if (NULL == a) {
+ goto err_mod;
+ }
+
+ /* backward compatibility for policer */
+ if (NULL == name) {
+ err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
+ if (0 > err ) {
+ err = -EINVAL;
+ goto err_mod;
+ }
+ } else {
+ err = a_o->init(rta, est, a, ovr, bind);
+ if (0 > err ) {
+ err = -EINVAL;
+ goto err_mod;
+ }
+ }
+
+ /* 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 (ACT_P_CREATED != err) {
+ module_put(a_o->owner);
+ }
+ a->ops = a_o;
+ DPRINTK("tcf_action_init_1: successfull %s \n",act_name);
+
+ return 0;
+err_mod:
+ module_put(a_o->owner);
+err_out:
+ return err;
+}
+
+int tcf_action_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a, char *name, int ovr , int bind)
+{
+ struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
+ int i;
+ struct tc_action *act = a, *a_s = a;
+
+ int err = -EINVAL;
+
+ if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(rta), RTA_PAYLOAD(rta))<0)
+ return err;
+
+ for (i=0; i < TCA_ACT_MAX_PRIO ; i++) {
+ if (tb[i]) {
+ if (NULL == act) {
+ act = kmalloc(sizeof(*act),GFP_KERNEL);
+ if (NULL == act) {
+ err = -ENOMEM;
+ goto bad_ret;
+ }
+ memset(act, 0,sizeof(*act));
+ }
+ act->next = NULL;
+ if (0 > tcf_action_init_1(tb[i],est,act,name,ovr,bind)) {
+ printk("Error processing action order %d\n",i);
+ return err;
+ }
+
+ act->order = i+1;
+ if (a_s != act) {
+ a_s->next = act;
+ a_s = act;
+ }
+ act = NULL;
+ }
+
+ }
+
+ return 0;
+bad_ret:
+ tcf_action_destroy(a, bind);
+ return err;
+}
+
+int tcf_action_copy_stats (struct sk_buff *skb,struct tc_action *a)
+{
+#ifdef CONFIG_KMOD
+ /* place holder */
+#endif
+
+ if (NULL == a->ops || NULL == a->ops->get_stats)
+ return 1;
+
+ return a->ops->get_stats(skb,a);
+}
+
+
+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);
+ 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;
+}
+
+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;
+}
+
+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");
+ }
+ }
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+
+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;
+}
+
+
+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;
+}
+
+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);
git://git.onelab.eu / linux-2.6.git / blobdiff