| /* |
| * 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/init.h> |
| #include <linux/kmod.h> |
| #include <net/sock.h> |
| #include <net/sch_generic.h> |
| #include <net/act_api.h> |
| #include <net/netlink.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); |
| gen_kill_estimator(&p->tcfc_bstats, |
| &p->tcfc_rate_est); |
| 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_pointer(skb); |
| RTA_PUT(skb, a->order, 0, NULL); |
| err = tcf_action_dump_1(skb, a, 0, 0); |
| if (err < 0) { |
| index--; |
| nlmsg_trim(skb, r); |
| goto done; |
| } |
| r->rta_len = skb_tail_pointer(skb) - (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: |
| nlmsg_trim(skb, r); |
| 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_pointer(skb); |
| 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_pointer(skb) - (u8 *)r; |
| |
| return n_i; |
| rtattr_failure: |
| nlmsg_trim(skb, r); |
| 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; |
| if (est) |
| gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, |
| p->tcfc_stats_lock, est); |
| 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_pointer(skb); |
| 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_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_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 || |
| 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); |