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- /*
- * 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 <linux/bitops.h>
- #include <linux/types.h>
- #include <linux/kernel.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/sch_generic.h>
- #include <net/act_api.h>
- void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
- {
- unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
- struct tcf_common **p1p;
- for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
- if (*p1p == p) {
- write_lock_bh(hinfo->lock);
- *p1p = p->tcfc_next;
- write_unlock_bh(hinfo->lock);
- #ifdef CONFIG_NET_ESTIMATOR
- gen_kill_estimator(&p->tcfc_bstats,
- &p->tcfc_rate_est);
- #endif
- kfree(p);
- return;
- }
- }
- BUG_TRAP(0);
- }
- EXPORT_SYMBOL(tcf_hash_destroy);
- int tcf_hash_release(struct tcf_common *p, int bind,
- struct tcf_hashinfo *hinfo)
- {
- int ret = 0;
- if (p) {
- if (bind)
- p->tcfc_bindcnt--;
- p->tcfc_refcnt--;
- if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
- tcf_hash_destroy(p, hinfo);
- ret = 1;
- }
- }
- return ret;
- }
- EXPORT_SYMBOL(tcf_hash_release);
- static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
- struct tc_action *a, struct tcf_hashinfo *hinfo)
- {
- struct tcf_common *p;
- int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
- struct rtattr *r ;
- read_lock(hinfo->lock);
- s_i = cb->args[0];
- for (i = 0; i < (hinfo->hmask + 1); i++) {
- p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
- for (; p; p = p->tcfc_next) {
- index++;
- if (index < s_i)
- continue;
- a->priv = p;
- a->order = n_i;
- r = (struct rtattr*) skb->tail;
- RTA_PUT(skb, a->order, 0, NULL);
- err = tcf_action_dump_1(skb, a, 0, 0);
- if (err < 0) {
- index--;
- skb_trim(skb, (u8*)r - skb->data);
- goto done;
- }
- r->rta_len = skb->tail - (u8*)r;
- n_i++;
- if (n_i >= TCA_ACT_MAX_PRIO)
- goto done;
- }
- }
- done:
- read_unlock(hinfo->lock);
- if (n_i)
- cb->args[0] += n_i;
- return n_i;
- rtattr_failure:
- skb_trim(skb, (u8*)r - skb->data);
- goto done;
- }
- static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
- struct tcf_hashinfo *hinfo)
- {
- struct tcf_common *p, *s_p;
- struct rtattr *r ;
- int i= 0, n_i = 0;
- r = (struct rtattr*) skb->tail;
- RTA_PUT(skb, a->order, 0, NULL);
- RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
- for (i = 0; i < (hinfo->hmask + 1); i++) {
- p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
- while (p != NULL) {
- s_p = p->tcfc_next;
- if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
- module_put(a->ops->owner);
- n_i++;
- p = s_p;
- }
- }
- RTA_PUT(skb, TCA_FCNT, 4, &n_i);
- r->rta_len = skb->tail - (u8*)r;
- return n_i;
- rtattr_failure:
- skb_trim(skb, (u8*)r - skb->data);
- return -EINVAL;
- }
- int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
- int type, struct tc_action *a)
- {
- struct tcf_hashinfo *hinfo = a->ops->hinfo;
- if (type == RTM_DELACTION) {
- return tcf_del_walker(skb, a, hinfo);
- } else if (type == RTM_GETACTION) {
- return tcf_dump_walker(skb, cb, a, hinfo);
- } else {
- printk("tcf_generic_walker: unknown action %d\n", type);
- return -EINVAL;
- }
- }
- EXPORT_SYMBOL(tcf_generic_walker);
- struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
- {
- struct tcf_common *p;
- read_lock(hinfo->lock);
- for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
- p = p->tcfc_next) {
- if (p->tcfc_index == index)
- break;
- }
- read_unlock(hinfo->lock);
- return p;
- }
- EXPORT_SYMBOL(tcf_hash_lookup);
- u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
- {
- u32 val = *idx_gen;
- do {
- if (++val == 0)
- val = 1;
- } while (tcf_hash_lookup(val, hinfo));
- return (*idx_gen = val);
- }
- EXPORT_SYMBOL(tcf_hash_new_index);
- int tcf_hash_search(struct tc_action *a, u32 index)
- {
- struct tcf_hashinfo *hinfo = a->ops->hinfo;
- struct tcf_common *p = tcf_hash_lookup(index, hinfo);
- if (p) {
- a->priv = p;
- return 1;
- }
- return 0;
- }
- EXPORT_SYMBOL(tcf_hash_search);
- struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
- struct tcf_hashinfo *hinfo)
- {
- struct tcf_common *p = NULL;
- if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
- if (bind) {
- p->tcfc_bindcnt++;
- p->tcfc_refcnt++;
- }
- a->priv = p;
- }
- return p;
- }
- EXPORT_SYMBOL(tcf_hash_check);
- 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)
- {
- struct tcf_common *p = kzalloc(size, GFP_KERNEL);
- if (unlikely(!p))
- return p;
- p->tcfc_refcnt = 1;
- if (bind)
- p->tcfc_bindcnt = 1;
- spin_lock_init(&p->tcfc_lock);
- p->tcfc_stats_lock = &p->tcfc_lock;
- p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
- p->tcfc_tm.install = jiffies;
- p->tcfc_tm.lastuse = jiffies;
- #ifdef CONFIG_NET_ESTIMATOR
- if (est)
- gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
- p->tcfc_stats_lock, est);
- #endif
- a->priv = (void *) p;
- return p;
- }
- EXPORT_SYMBOL(tcf_hash_create);
- void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
- {
- unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
- write_lock_bh(hinfo->lock);
- p->tcfc_next = hinfo->htab[h];
- hinfo->htab[h] = p;
- write_unlock_bh(hinfo->lock);
- }
- EXPORT_SYMBOL(tcf_hash_insert);
- static struct tc_action_ops *act_base = NULL;
- static DEFINE_RWLOCK(act_mod_lock);
- 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 */
- static 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 */
- static 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 (rtattr_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;
- }
- #if 0
- /* lookup by id */
- static 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;
- }
- #endif
- int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
- struct tcf_result *res)
- {
- struct tc_action *a;
- int ret = -1;
- if (skb->tc_verd & TC_NCLS) {
- skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
- ret = TC_ACT_OK;
- goto exec_done;
- }
- while ((a = act) != NULL) {
- repeat:
- if (a->ops && a->ops->act) {
- ret = a->ops->act(skb, a, res);
- 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_REPEAT)
- goto repeat; /* we need a ttl - JHS */
- if (ret != TC_ACT_PIPE)
- goto exec_done;
- }
- act = a->next;
- }
- exec_done:
- return ret;
- }
- void tcf_action_destroy(struct tc_action *act, int bind)
- {
- struct tc_action *a;
- for (a = act; a; a = act) {
- if (a->ops && a->ops->cleanup) {
- if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
- module_put(a->ops->owner);
- act = act->next;
- kfree(a);
- } else { /*FIXME: Remove later - catch insertion bugs*/
- printk("tcf_action_destroy: BUG? destroying NULL ops\n");
- act = act->next;
- kfree(a);
- }
- }
- }
- int
- tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
- {
- int err = -EINVAL;
- if (a->ops == NULL || a->ops->dump == NULL)
- 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 (a->ops == NULL || a->ops->dump == NULL)
- return err;
- 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;
- 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 (err < 0)
- goto errout;
- r->rta_len = skb->tail - (u8*)r;
- }
- return 0;
- rtattr_failure:
- err = -EINVAL;
- errout:
- skb_trim(skb, b - skb->data);
- 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_stats_lock, &d);
- else
- return 0;
- } else
- err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
- h->tcf_stats_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 ||
- #ifdef CONFIG_NET_ESTIMATOR
- gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
- #endif
- 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;
- 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;
- 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 - (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;
- 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 = (unsigned char *)skb->tail;
- 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;
- 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 - (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, 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 = (unsigned char *)skb->tail;
- 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;
- 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 - (u8*)x;
- nlh->nlmsg_len = skb->tail - 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;
- 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;
- 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 - (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;
- }
- 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);
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