/* * 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 0 /* 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, 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) { 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); } }} inttcf_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);} inttcf_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;} inttcf_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_%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 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 inttca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, u16 flags, int event, int bind, int ref){ struct tcamsg *t; struct nlmsghdr *nlh; unsigned char *b = skb->tail; struct rtattr *x; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); t = NLMSG_DATA(nlh); t->tca_family = AF_UNSPEC; t->tca__pad1 = 0; t->tca__pad2 = 0; x = (struct rtattr*) skb->tail; RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); if (tcf_action_dump(skb, a, bind, ref) < 0) goto rtattr_failure; x->rta_len = skb->tail - (u8*)x; nlh->nlmsg_len = skb->tail - b; return skb->len; rtattr_failure:nlmsg_failure: skb_trim(skb, b - skb->data); return -1;} static intact_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)Lines 1–500 of 896. 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/* * net/sched/act_api.c Packet action API. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Author: Jamal Hadi Salim * * */ #include <asm/uaccess.h> #include <asm/system.h> #include <linux/bitops.h> #include <linux/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 0 /* 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, 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) { 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_%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 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, u16 flags, int event, int bind, int ref) { struct tcamsg *t; struct nlmsghdr *nlh; unsigned char *b = skb->tail; struct rtattr *x; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); t = NLMSG_DATA(nlh); t->tca_family = AF_UNSPEC; t->tca__pad1 = 0; t->tca__pad2 = 0; x = (struct rtattr*) skb->tail; RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); if (tcf_action_dump(skb, a, bind, ref) < 0) goto rtattr_failure; x->rta_len = skb->tail - (u8*)x; nlh->nlmsg_len = skb->tail - b; return skb->len; rtattr_failure: nlmsg_failure: skb_trim(skb, b - skb->data); return -1; } static int act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) { struct sk_buff *skb; 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)