diff options
Diffstat (limited to 'net/sched/act_api.c')
| -rw-r--r-- | net/sched/act_api.c | 1127 |
1 files changed, 1127 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c new file mode 100644 index 00000000..93fdf131 --- /dev/null +++ b/net/sched/act_api.c @@ -0,0 +1,1127 @@ +/* + * 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 <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/skbuff.h> +#include <linux/init.h> +#include <linux/kmod.h> +#include <linux/err.h> +#include <linux/module.h> +#include <net/net_namespace.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); + /* + * gen_estimator est_timer() might access p->tcfc_lock + * or bstats, wait a RCU grace period before freeing p + */ + kfree_rcu(p, tcfc_rcu); + return; + } + } + WARN_ON(1); +} +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 nlattr *nest; + + read_lock_bh(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; + + nest = nla_nest_start(skb, a->order); + if (nest == NULL) + goto nla_put_failure; + err = tcf_action_dump_1(skb, a, 0, 0); + if (err < 0) { + index--; + nlmsg_trim(skb, nest); + goto done; + } + nla_nest_end(skb, nest); + n_i++; + if (n_i >= TCA_ACT_MAX_PRIO) + goto done; + } + } +done: + read_unlock_bh(hinfo->lock); + if (n_i) + cb->args[0] += n_i; + return n_i; + +nla_put_failure: + nla_nest_cancel(skb, nest); + 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 nlattr *nest; + int i = 0, n_i = 0; + + nest = nla_nest_start(skb, a->order); + if (nest == NULL) + goto nla_put_failure; + NLA_PUT_STRING(skb, TCA_KIND, 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; + } + } + NLA_PUT_U32(skb, TCA_FCNT, n_i); + nla_nest_end(skb, nest); + + return n_i; +nla_put_failure: + nla_nest_cancel(skb, nest); + 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 { + WARN(1, "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_bh(hinfo->lock); + for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; + p = p->tcfc_next) { + if (p->tcfc_index == index) + break; + } + read_unlock_bh(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 nlattr *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 ERR_PTR(-ENOMEM); + p->tcfc_refcnt = 1; + if (bind) + p->tcfc_bindcnt = 1; + + spin_lock_init(&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) { + int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, + &p->tcfc_lock, est); + if (err) { + kfree(p); + return ERR_PTR(err); + } + } + + 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; +} +EXPORT_SYMBOL(tcf_register_action); + +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; +} +EXPORT_SYMBOL(tcf_unregister_action); + +/* 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 nlattr */ +static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) +{ + struct tc_action_ops *a = NULL; + + if (kind) { + read_lock(&act_mod_lock); + for (a = act_base; a; a = a->next) { + if (nla_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, const struct tc_action *act, + struct tcf_result *res) +{ + const 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; +} +EXPORT_SYMBOL(tcf_action_exec); + +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*/ + WARN(1, "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 nlattr *nest; + + if (a->ops == NULL || a->ops->dump == NULL) + return err; + + NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); + if (tcf_action_copy_stats(skb, a, 0)) + goto nla_put_failure; + nest = nla_nest_start(skb, TCA_OPTIONS); + if (nest == NULL) + goto nla_put_failure; + err = tcf_action_dump_old(skb, a, bind, ref); + if (err > 0) { + nla_nest_end(skb, nest); + return err; + } + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} +EXPORT_SYMBOL(tcf_action_dump_1); + +int +tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) +{ + struct tc_action *a; + int err = -EINVAL; + struct nlattr *nest; + + while ((a = act) != NULL) { + act = a->next; + nest = nla_nest_start(skb, a->order); + if (nest == NULL) + goto nla_put_failure; + err = tcf_action_dump_1(skb, a, bind, ref); + if (err < 0) + goto errout; + nla_nest_end(skb, nest); + } + + return 0; + +nla_put_failure: + err = -EINVAL; +errout: + nla_nest_cancel(skb, nest); + return err; +} + +struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, + char *name, int ovr, int bind) +{ + struct tc_action *a; + struct tc_action_ops *a_o; + char act_name[IFNAMSIZ]; + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct nlattr *kind; + int err; + + if (name == NULL) { + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); + if (err < 0) + goto err_out; + err = -EINVAL; + kind = tb[TCA_ACT_KIND]; + if (kind == NULL) + goto err_out; + if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) + goto err_out; + } else { + err = -EINVAL; + if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) + goto err_out; + } + + a_o = tc_lookup_action_n(act_name); + if (a_o == NULL) { +#ifdef CONFIG_MODULES + 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], est, a, ovr, bind); + else + err = a_o->init(nla, 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; + + return a; + +err_free: + kfree(a); +err_mod: + module_put(a_o->owner); +err_out: + return ERR_PTR(err); +} + +struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, + char *name, int ovr, int bind) +{ + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *head = NULL, *act, *act_prev = NULL; + int err; + int i; + + err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); + if (err < 0) + return ERR_PTR(err); + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_init_1(tb[i], est, name, ovr, bind); + if (IS_ERR(act)) + goto err; + act->order = i; + + 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 act; +} + +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 compatibility statistic TLVs. + */ + if (compat_mode) { + if (a->type == TCA_OLD_COMPAT) + err = gnet_stats_start_copy_compat(skb, 0, + TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); + else + return 0; + } else + err = gnet_stats_start_copy(skb, TCA_ACT_STATS, + &h->tcf_lock, &d); + + if (err < 0) + goto errout; + + if (a->ops != NULL && a->ops->get_stats != NULL) + if (a->ops->get_stats(skb, a) < 0) + goto errout; + + if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || + gnet_stats_copy_rate_est(&d, &h->tcf_bstats, + &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 nlattr *nest; + + 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; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (nest == NULL) + goto nla_put_failure; + + if (tcf_action_dump(skb, a, bind, ref) < 0) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + return skb->len; + +nla_put_failure: +nlmsg_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int +act_get_notify(struct net *net, 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, net, pid); +} + +static struct tc_action * +tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) +{ + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct tc_action *a; + int index; + int err; + + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); + if (err < 0) + goto err_out; + + err = -EINVAL; + if (tb[TCA_ACT_INDEX] == NULL || + nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) + goto err_out; + index = nla_get_u32(tb[TCA_ACT_INDEX]); + + err = -ENOMEM; + a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); + if (a == NULL) + goto err_out; + + err = -EINVAL; + a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); + 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); + return a; + +err_mod: + module_put(a->ops->owner); +err_free: + kfree(a); +err_out: + return ERR_PTR(err); +} + +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) { + pr_debug("create_a: failed to alloc!\n"); + return NULL; + } + act->order = i; + return act; +} + +static int tca_action_flush(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 pid) +{ + struct sk_buff *skb; + unsigned char *b; + struct nlmsghdr *nlh; + struct tcamsg *t; + struct netlink_callback dcb; + struct nlattr *nest; + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct nlattr *kind; + struct tc_action *a = create_a(0); + int err = -ENOMEM; + + if (a == NULL) { + pr_debug("tca_action_flush: couldnt create tc_action\n"); + return err; + } + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) { + pr_debug("tca_action_flush: failed skb alloc\n"); + kfree(a); + return err; + } + + b = skb_tail_pointer(skb); + + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); + if (err < 0) + goto err_out; + + err = -EINVAL; + kind = tb[TCA_ACT_KIND]; + 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; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (nest == NULL) + goto nla_put_failure; + + err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); + if (err < 0) + goto nla_put_failure; + if (err == 0) + goto noflush_out; + + nla_nest_end(skb, nest); + + 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, net, pid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (err > 0) + return 0; + + return err; + +nla_put_failure: +nlmsg_failure: + module_put(a->ops->owner); +err_out: +noflush_out: + kfree_skb(skb); + kfree(a); + return err; +} + +static int +tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, + u32 pid, int event) +{ + int i, ret; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *head = NULL, *act, *act_prev = NULL; + + ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); + if (ret < 0) + return ret; + + if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { + if (tb[1] != NULL) + return tca_action_flush(net, tb[1], n, pid); + else + return -EINVAL; + } + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_get_1(tb[i], n, pid); + if (IS_ERR(act)) { + ret = PTR_ERR(act); + goto err; + } + act->order = i; + + if (head == NULL) + head = act; + else + act_prev->next = act; + act_prev = act; + } + + if (event == RTM_GETACTION) + ret = act_get_notify(net, 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, net, 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 net *net, struct tc_action *a, + u32 pid, u32 seq, int event, u16 flags) +{ + struct tcamsg *t; + struct nlmsghdr *nlh; + struct sk_buff *skb; + struct nlattr *nest; + 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; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (nest == NULL) + goto nla_put_failure; + + if (tcf_action_dump(skb, a, 0, 0) < 0) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + NETLINK_CB(skb).dst_group = RTNLGRP_TC; + + err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO); + if (err > 0) + err = 0; + return err; + +nla_put_failure: +nlmsg_failure: + kfree_skb(skb); + return -1; +} + + +static int +tcf_action_add(struct net *net, struct nlattr *nla, 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(nla, NULL, NULL, ovr, 0); + if (act == NULL) + goto done; + if (IS_ERR(act)) { + ret = PTR_ERR(act); + goto done; + } + + /* dump then free all the actions after update; inserted policy + * stays intact + */ + ret = tcf_add_notify(net, 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 net *net = sock_net(skb->sk); + struct nlattr *tca[TCA_ACT_MAX + 1]; + u32 pid = skb ? NETLINK_CB(skb).pid : 0; + int ret = 0, ovr = 0; + + ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); + if (ret < 0) + return ret; + + if (tca[TCA_ACT_TAB] == NULL) { + pr_notice("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 doesn't 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(net, tca[TCA_ACT_TAB], n, pid, ovr); + if (ret == -EAGAIN) + goto replay; + break; + case RTM_DELACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + pid, RTM_DELACTION); + break; + case RTM_GETACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + pid, RTM_GETACTION); + break; + default: + BUG(); + } + + return ret; +} + +static struct nlattr * +find_dump_kind(const struct nlmsghdr *n) +{ + struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct nlattr *nla[TCAA_MAX + 1]; + struct nlattr *kind; + + if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) + return NULL; + tb1 = nla[TCA_ACT_TAB]; + if (tb1 == NULL) + return NULL; + + if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), + NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) + return NULL; + + if (tb[1] == NULL) + return NULL; + if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), + nla_len(tb[1]), NULL) < 0) + return NULL; + kind = tb2[TCA_ACT_KIND]; + + 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 nlattr *nest; + struct tc_action_ops *a_o; + struct tc_action a; + int ret = 0; + struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); + struct nlattr *kind = find_dump_kind(cb->nlh); + + if (kind == NULL) { + pr_info("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) { + WARN(1, "tc_dump_action: %s !capable of dumping table\n", + a_o->kind); + goto nla_put_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; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (nest == NULL) + goto nla_put_failure; + + ret = a_o->walk(skb, cb, RTM_GETACTION, &a); + if (ret < 0) + goto nla_put_failure; + + if (ret > 0) { + nla_nest_end(skb, nest); + ret = skb->len; + } else + nla_nest_cancel(skb, nest); + + 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; + +nla_put_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, NULL); + rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); + rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, + NULL); + + return 0; +} + +subsys_initcall(tc_action_init); |