diff options
Diffstat (limited to 'kernel/net/sched/act_api.c')
| -rw-r--r-- | kernel/net/sched/act_api.c | 1094 |
1 files changed, 1094 insertions, 0 deletions
diff --git a/kernel/net/sched/act_api.c b/kernel/net/sched/act_api.c new file mode 100644 index 000000000..3d43e4979 --- /dev/null +++ b/kernel/net/sched/act_api.c @@ -0,0 +1,1094 @@ +/* + * 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 tc_action *a) +{ + struct tcf_common *p = a->priv; + struct tcf_hashinfo *hinfo = a->ops->hinfo; + + spin_lock_bh(&hinfo->lock); + hlist_del(&p->tcfc_head); + spin_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); +} +EXPORT_SYMBOL(tcf_hash_destroy); + +int tcf_hash_release(struct tc_action *a, int bind) +{ + struct tcf_common *p = a->priv; + int ret = 0; + + if (p) { + if (bind) + p->tcfc_bindcnt--; + else if (p->tcfc_bindcnt > 0) + return -EPERM; + + p->tcfc_refcnt--; + if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { + if (a->ops->cleanup) + a->ops->cleanup(a, bind); + tcf_hash_destroy(a); + 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 = a->ops->hinfo; + struct hlist_head *head; + struct tcf_common *p; + int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; + struct nlattr *nest; + + spin_lock_bh(&hinfo->lock); + + s_i = cb->args[0]; + + for (i = 0; i < (hinfo->hmask + 1); i++) { + head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; + + hlist_for_each_entry_rcu(p, head, tcfc_head) { + 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: + spin_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 = a->ops->hinfo; + struct hlist_head *head; + struct hlist_node *n; + struct tcf_common *p; + struct nlattr *nest; + int i = 0, n_i = 0; + int ret = -EINVAL; + + nest = nla_nest_start(skb, a->order); + if (nest == NULL) + goto nla_put_failure; + if (nla_put_string(skb, TCA_KIND, a->ops->kind)) + goto nla_put_failure; + for (i = 0; i < (hinfo->hmask + 1); i++) { + head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; + hlist_for_each_entry_safe(p, n, head, tcfc_head) { + a->priv = p; + ret = tcf_hash_release(a, 0); + if (ret == ACT_P_DELETED) { + module_put(a->ops->owner); + n_i++; + } else if (ret < 0) + goto nla_put_failure; + } + } + if (nla_put_u32(skb, TCA_FCNT, n_i)) + goto nla_put_failure; + nla_nest_end(skb, nest); + + return n_i; +nla_put_failure: + nla_nest_cancel(skb, nest); + return ret; +} + +static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, + int type, struct tc_action *a) +{ + if (type == RTM_DELACTION) { + return tcf_del_walker(skb, a); + } else if (type == RTM_GETACTION) { + return tcf_dump_walker(skb, cb, a); + } else { + WARN(1, "tcf_generic_walker: unknown action %d\n", type); + return -EINVAL; + } +} + +static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) +{ + struct tcf_common *p = NULL; + struct hlist_head *head; + + spin_lock_bh(&hinfo->lock); + head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; + hlist_for_each_entry_rcu(p, head, tcfc_head) + if (p->tcfc_index == index) + break; + spin_unlock_bh(&hinfo->lock); + + return p; +} + +u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) +{ + u32 val = hinfo->index; + + do { + if (++val == 0) + val = 1; + } while (tcf_hash_lookup(val, hinfo)); + + hinfo->index = val; + return 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); + +int tcf_hash_check(u32 index, struct tc_action *a, int bind) +{ + struct tcf_hashinfo *hinfo = a->ops->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 1; + } + return 0; +} +EXPORT_SYMBOL(tcf_hash_check); + +void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) +{ + struct tcf_common *pc = a->priv; + if (est) + gen_kill_estimator(&pc->tcfc_bstats, + &pc->tcfc_rate_est); + kfree_rcu(pc, tcfc_rcu); +} +EXPORT_SYMBOL(tcf_hash_cleanup); + +int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, + int size, int bind) +{ + struct tcf_hashinfo *hinfo = a->ops->hinfo; + struct tcf_common *p = kzalloc(size, GFP_KERNEL); + + if (unlikely(!p)) + return -ENOMEM; + p->tcfc_refcnt = 1; + if (bind) + p->tcfc_bindcnt = 1; + + spin_lock_init(&p->tcfc_lock); + INIT_HLIST_NODE(&p->tcfc_head); + p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); + p->tcfc_tm.install = jiffies; + p->tcfc_tm.lastuse = jiffies; + if (est) { + int err = gen_new_estimator(&p->tcfc_bstats, NULL, + &p->tcfc_rate_est, + &p->tcfc_lock, est); + if (err) { + kfree(p); + return err; + } + } + + a->priv = (void *) p; + return 0; +} +EXPORT_SYMBOL(tcf_hash_create); + +void tcf_hash_insert(struct tc_action *a) +{ + struct tcf_common *p = a->priv; + struct tcf_hashinfo *hinfo = a->ops->hinfo; + unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); + + spin_lock_bh(&hinfo->lock); + hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); + spin_unlock_bh(&hinfo->lock); +} +EXPORT_SYMBOL(tcf_hash_insert); + +static LIST_HEAD(act_base); +static DEFINE_RWLOCK(act_mod_lock); + +int tcf_register_action(struct tc_action_ops *act, unsigned int mask) +{ + struct tc_action_ops *a; + int err; + + /* Must supply act, dump and init */ + if (!act->act || !act->dump || !act->init) + return -EINVAL; + + /* Supply defaults */ + if (!act->lookup) + act->lookup = tcf_hash_search; + if (!act->walk) + act->walk = tcf_generic_walker; + + act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL); + if (!act->hinfo) + return -ENOMEM; + err = tcf_hashinfo_init(act->hinfo, mask); + if (err) { + kfree(act->hinfo); + return err; + } + + write_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { + write_unlock(&act_mod_lock); + tcf_hashinfo_destroy(act->hinfo); + kfree(act->hinfo); + return -EEXIST; + } + } + list_add_tail(&act->head, &act_base); + 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; + int err = -ENOENT; + + write_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (a == act) { + list_del(&act->head); + tcf_hashinfo_destroy(act->hinfo); + kfree(act->hinfo); + err = 0; + break; + } + } + 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, *res = NULL; + + if (kind) { + read_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) + res = a; + break; + } + } + read_unlock(&act_mod_lock); + } + return res; +} + +/* lookup by nlattr */ +static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) +{ + struct tc_action_ops *a, *res = NULL; + + if (kind) { + read_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (nla_strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) + res = a; + break; + } + } + read_unlock(&act_mod_lock); + } + return res; +} + +int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, + 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; + } + list_for_each_entry(a, actions, list) { +repeat: + 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; + } +exec_done: + return ret; +} +EXPORT_SYMBOL(tcf_action_exec); + +int tcf_action_destroy(struct list_head *actions, int bind) +{ + struct tc_action *a, *tmp; + int ret = 0; + + list_for_each_entry_safe(a, tmp, actions, list) { + ret = tcf_hash_release(a, bind); + if (ret == ACT_P_DELETED) + module_put(a->ops->owner); + else if (ret < 0) + return ret; + list_del(&a->list); + kfree(a); + } + return ret; +} + +int +tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) +{ + 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 (nla_put_string(skb, TCA_KIND, a->ops->kind)) + goto nla_put_failure; + 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 list_head *actions, int bind, int ref) +{ + struct tc_action *a; + int err = -EINVAL; + struct nlattr *nest; + + list_for_each_entry(a, actions, list) { + 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 net *net, 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; + + a->ops = a_o; + INIT_LIST_HEAD(&a->list); + /* backward compatibility for policer */ + if (name == NULL) + err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); + else + err = a_o->init(net, 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); + + return a; + +err_free: + kfree(a); +err_mod: + module_put(a_o->owner); +err_out: + return ERR_PTR(err); +} + +int tcf_action_init(struct net *net, struct nlattr *nla, + struct nlattr *est, char *name, int ovr, + int bind, struct list_head *actions) +{ + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *act; + int err; + int i; + + err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); + if (err < 0) + return err; + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); + if (IS_ERR(act)) { + err = PTR_ERR(act); + goto err; + } + act->order = i; + list_add_tail(&act->list, actions); + } + return 0; + +err: + tcf_action_destroy(actions, bind); + return err; +} + +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_common *p = a->priv; + + if (p == 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, &p->tcfc_lock, &d); + else + return 0; + } else + err = gnet_stats_start_copy(skb, TCA_ACT_STATS, + &p->tcfc_lock, &d); + + if (err < 0) + goto errout; + + if (gnet_stats_copy_basic(&d, NULL, &p->tcfc_bstats) < 0 || + gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, + &p->tcfc_rate_est) < 0 || + gnet_stats_copy_queue(&d, NULL, + &p->tcfc_qstats, + p->tcfc_qstats.qlen) < 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 list_head *actions, u32 portid, 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_put(skb, portid, seq, event, sizeof(*t), flags); + if (!nlh) + goto out_nlmsg_trim; + 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 out_nlmsg_trim; + + if (tcf_action_dump(skb, actions, bind, ref) < 0) + goto out_nlmsg_trim; + + nla_nest_end(skb, nest); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int +act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, + struct list_head *actions, int event) +{ + struct sk_buff *skb; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + + return rtnl_unicast(skb, net, portid); +} + +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; + INIT_LIST_HEAD(&act->list); + return act; +} + +static struct tc_action * +tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) +{ + 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 = create_a(0); + if (a == NULL) + goto err_out; + + err = -EINVAL; + a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); + if (a->ops == NULL) /* could happen in batch of actions */ + goto err_free; + 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 list_head *actions) +{ + struct tc_action *a, *tmp; + + list_for_each_entry_safe(a, tmp, actions, list) { + list_del(&a->list); + kfree(a); + } +} + +static int tca_action_flush(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 portid) +{ + 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; + int err = -ENOMEM; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) { + pr_debug("tca_action_flush: failed skb alloc\n"); + 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]; + memset(&a, 0, sizeof(struct tc_action)); + INIT_LIST_HEAD(&a.list); + a.ops = tc_lookup_action(kind); + if (a.ops == NULL) /*some idjot trying to flush unknown action */ + goto err_out; + + nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); + if (!nlh) + goto out_module_put; + 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 out_module_put; + + err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a); + if (err < 0) + goto out_module_put; + 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); + err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (err > 0) + return 0; + + return err; + +out_module_put: + module_put(a.ops->owner); +err_out: +noflush_out: + kfree_skb(skb); + return err; +} + +static int +tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, + u32 portid) +{ + int ret; + struct sk_buff *skb; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, + 0, 1) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + + /* now do the delete */ + ret = tcf_action_destroy(actions, 0); + if (ret < 0) { + kfree_skb(skb); + return ret; + } + + ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (ret > 0) + return 0; + return ret; +} + +static int +tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, + u32 portid, int event) +{ + int i, ret; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *act; + LIST_HEAD(actions); + + 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, portid); + else + return -EINVAL; + } + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_get_1(tb[i], n, portid); + if (IS_ERR(act)) { + ret = PTR_ERR(act); + goto err; + } + act->order = i; + list_add_tail(&act->list, &actions); + } + + if (event == RTM_GETACTION) + ret = act_get_notify(net, portid, n, &actions, event); + else { /* delete */ + ret = tcf_del_notify(net, n, &actions, portid); + if (ret) + goto err; + return ret; + } +err: + cleanup_a(&actions); + return ret; +} + +static int +tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, + u32 portid) +{ + struct sk_buff *skb; + int err = 0; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, + RTM_NEWACTION, 0, 0) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + + err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (err > 0) + err = 0; + return err; +} + +static int +tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, + u32 portid, int ovr) +{ + int ret = 0; + LIST_HEAD(actions); + + ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); + if (ret) + goto done; + + /* dump then free all the actions after update; inserted policy + * stays intact + */ + ret = tcf_add_notify(net, n, &actions, portid); + cleanup_a(&actions); +done: + return ret; +} + +static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *tca[TCA_ACT_MAX + 1]; + u32 portid = skb ? NETLINK_CB(skb).portid : 0; + int ret = 0, ovr = 0; + + if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + 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, portid, ovr); + if (ret == -EAGAIN) + goto replay; + break; + case RTM_DELACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + portid, RTM_DELACTION); + break; + case RTM_GETACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + portid, 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; + + nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + cb->nlh->nlmsg_type, sizeof(*t), 0); + if (!nlh) + goto out_module_put; + 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 out_module_put; + + ret = a_o->walk(skb, cb, RTM_GETACTION, &a); + if (ret < 0) + goto out_module_put; + + 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).portid && ret) + nlh->nlmsg_flags |= NLM_F_MULTI; + module_put(a_o->owner); + return skb->len; + +out_module_put: + 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); |