diff options
Diffstat (limited to 'net/sched/act_api.c')
| -rw-r--r-- | net/sched/act_api.c | 894 |
1 files changed, 894 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c new file mode 100644 index 000000000000..5e6cc371b39e --- /dev/null +++ b/net/sched/act_api.c @@ -0,0 +1,894 @@ +/* + * 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/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <linux/init.h> +#include <linux/kmod.h> +#include <net/sock.h> +#include <net/sch_generic.h> +#include <net/act_api.h> + +#if 1 /* control */ +#define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args) +#else +#define DPRINTK(format, args...) +#endif +#if 0 /* data */ +#define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args) +#else +#define D2PRINTK(format, args...) +#endif + +static struct tc_action_ops *act_base = NULL; +static 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); + D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n", + skb, skb->input_dev ? skb->input_dev->name : "xxx", + skb->dev->name); + ret = TC_ACT_OK; + goto exec_done; + } + while ((a = act) != NULL) { +repeat: + if (a->ops && a->ops->act) { + ret = a->ops->act(&skb, a); + if (TC_MUNGED & skb->tc_verd) { + /* copied already, allow trampling */ + skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); + skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); + } + if (ret != TC_ACT_PIPE) + goto exec_done; + if (ret == TC_ACT_REPEAT) + goto repeat; /* we need a ttl - JHS */ + } + act = a->next; + } +exec_done: + if (skb->tc_classid > 0) { + res->classid = skb->tc_classid; + res->class = 0; + skb->tc_classid = 0; + } + 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) { + DPRINTK("tcf_action_destroy destroying %p next %p\n", + a, a->next); + 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 rtattr_failure; + r->rta_len = skb->tail - (u8*)r; + } + + return 0; + +rtattr_failure: + 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_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 + goto err_out; + } + + *err = -ENOMEM; + a = kmalloc(sizeof(*a), GFP_KERNEL); + if (a == NULL) + goto err_mod; + memset(a, 0, sizeof(*a)); + + /* 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; + DPRINTK("tcf_action_init_1: successfull %s\n", act_name); + + *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->stats_lock, &d); + else + return 0; + } else + err = gnet_stats_start_copy(skb, TCA_ACT_STATS, + h->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->bstats) < 0 || +#ifdef CONFIG_NET_ESTIMATOR + gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 || +#endif + gnet_stats_copy_queue(&d, &h->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, + unsigned flags, int event, int bind, int ref) +{ + struct tcamsg *t; + struct nlmsghdr *nlh; + unsigned char *b = skb->tail; + struct rtattr *x; + + nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); + nlh->nlmsg_flags = flags; + t = NLMSG_DATA(nlh); + t->tca_family = AF_UNSPEC; + + x = (struct rtattr*) skb->tail; + RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); + + if (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; + int err = 0; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); + if (err > 0) + err = 0; + return err; +} + +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 = kmalloc(sizeof(struct tc_action), GFP_KERNEL); + if (a == NULL) + return NULL; + memset(a, 0, sizeof(struct tc_action)); + + *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 = kmalloc(sizeof(*act), GFP_KERNEL); + if (act == NULL) { + printk("create_a: failed to alloc!\n"); + return NULL; + } + memset(act, 0, sizeof(*act)); + 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; + + 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, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO); + if (err > 0) + return 0; + + return err; + +rtattr_failure: + module_put(a->ops->owner); +nlmsg_failure: +err_out: + kfree_skb(skb); + kfree(a); + return err; +} + +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, RTMGRP_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, + unsigned flags) +{ + struct tcamsg *t; + struct nlmsghdr *nlh; + struct sk_buff *skb; + struct rtattr *x; + unsigned char *b; + int err = 0; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + b = (unsigned char *)skb->tail; + + nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); + nlh->nlmsg_flags = flags; + t = NLMSG_DATA(nlh); + t->tca_family = AF_UNSPEC; + + x = (struct rtattr*) skb->tail; + RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); + + if (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_groups = RTMGRP_TC; + + err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO); + if (err > 0) + err = 0; + return err; + +rtattr_failure: +nlmsg_failure: + skb_trim(skb, b - skb->data); + return -1; +} + + +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 char * +find_dump_kind(struct nlmsghdr *n) +{ + struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; + struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct rtattr *rta[TCAA_MAX + 1]; + struct rtattr *kind; + 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 (char *) RTA_DATA(kind); +} + +static int +tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct nlmsghdr *nlh; + unsigned char *b = skb->tail; + struct rtattr *x; + struct tc_action_ops *a_o; + struct tc_action a; + int ret = 0; + struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); + char *kind = find_dump_kind(cb->nlh); + + if (kind == NULL) { + printk("tc_dump_action: action bad kind\n"); + return 0; + } + + a_o = tc_lookup_action_n(kind); + if (a_o == NULL) { + printk("failed to find %s\n", kind); + 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", kind); + goto rtattr_failure; + } + + nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, + cb->nlh->nlmsg_type, sizeof(*t)); + t = NLMSG_DATA(nlh); + t->tca_family = AF_UNSPEC; + + x = (struct rtattr *) skb->tail; + RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); + + ret = a_o->walk(skb, cb, RTM_GETACTION, &a); + if (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; + } + + printk("TC classifier action (bugs to netdev@oss.sgi.com cc " + "hadi@cyberus.ca)\n"); + return 0; +} + +subsys_initcall(tc_action_init); + +EXPORT_SYMBOL(tcf_register_action); +EXPORT_SYMBOL(tcf_unregister_action); +EXPORT_SYMBOL(tcf_action_exec); +EXPORT_SYMBOL(tcf_action_dump_1); |