/* * net/sched/cls_api.c Packet classifier 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. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * Changes: * * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support * */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/skbuff.h> #include <linux/init.h> #include <linux/kmod.h> #include <linux/err.h> #include <linux/slab.h> #include <net/net_namespace.h> #include <net/sock.h> #include <net/netlink.h> #include <net/pkt_sched.h> #include <net/pkt_cls.h> /* The list of all installed classifier types */ static LIST_HEAD(tcf_proto_base); /* Protects list of registered TC modules. It is pure SMP lock. */ static DEFINE_RWLOCK(cls_mod_lock); /* Find classifier type by string name */ static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind) { const struct tcf_proto_ops *t, *res = NULL; if (kind) { read_lock(&cls_mod_lock); list_for_each_entry(t, &tcf_proto_base, head) { if (strcmp(kind, t->kind) == 0) { if (try_module_get(t->owner)) res = t; break; } } read_unlock(&cls_mod_lock); } return res; } /* Register(unregister) new classifier type */ int register_tcf_proto_ops(struct tcf_proto_ops *ops) { struct tcf_proto_ops *t; int rc = -EEXIST; write_lock(&cls_mod_lock); list_for_each_entry(t, &tcf_proto_base, head) if (!strcmp(ops->kind, t->kind)) goto out; list_add_tail(&ops->head, &tcf_proto_base); rc = 0; out: write_unlock(&cls_mod_lock); return rc; } EXPORT_SYMBOL(register_tcf_proto_ops); static struct workqueue_struct *tc_filter_wq; int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) { struct tcf_proto_ops *t; int rc = -ENOENT; /* Wait for outstanding call_rcu()s, if any, from a * tcf_proto_ops's destroy() handler. */ rcu_barrier(); flush_workqueue(tc_filter_wq); write_lock(&cls_mod_lock); list_for_each_entry(t, &tcf_proto_base, head) { if (t == ops) { list_del(&t->head); rc = 0; break; } } write_unlock(&cls_mod_lock); return rc; } EXPORT_SYMBOL(unregister_tcf_proto_ops); bool tcf_queue_work(struct work_struct *work) { return queue_work(tc_filter_wq, work); } EXPORT_SYMBOL(tcf_queue_work); /* Select new prio value from the range, managed by kernel. */ static inline u32 tcf_auto_prio(struct tcf_proto *tp) { u32 first = TC_H_MAKE(0xC0000000U, 0U); if (tp) first = tp->prio - 1; return TC_H_MAJ(first); } static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, u32 prio, u32 parent, struct Qdisc *q, struct tcf_chain *chain) { struct tcf_proto *tp; int err; tp = kzalloc(sizeof(*tp), GFP_KERNEL); if (!tp) return ERR_PTR(-ENOBUFS); err = -ENOENT; tp->ops = tcf_proto_lookup_ops(kind); if (!tp->ops) { #ifdef CONFIG_MODULES rtnl_unlock(); request_module("cls_%s", kind); rtnl_lock(); tp->ops = tcf_proto_lookup_ops(kind); /* We dropped the RTNL semaphore in order to perform * the module load. So, even if we succeeded in loading * the module we have to replay the request. We indicate * this using -EAGAIN. */ if (tp->ops) { module_put(tp->ops->owner); err = -EAGAIN; } else { err = -ENOENT; } goto errout; #endif } tp->classify = tp->ops->classify; tp->protocol = protocol; tp->prio = prio; tp->classid = parent; tp->q = q; tp->chain = chain; err = tp->ops->init(tp); if (err) { module_put(tp->ops->owner); goto errout; } return tp; errout: kfree(tp); return ERR_PTR(err); } static void tcf_proto_destroy(struct tcf_proto *tp) { tp->ops->destroy(tp); module_put(tp->ops->owner); kfree_rcu(tp, rcu); } static struct tcf_chain *tcf_chain_create(struct tcf_block *block, u32 chain_index) { struct tcf_chain *chain; chain = kzalloc(sizeof(*chain), GFP_KERNEL); if (!chain) return NULL; list_add_tail(&chain->list, &block->chain_list); chain->block = block; chain->index = chain_index; chain->refcnt = 1; return chain; } static void tcf_chain_flush(struct tcf_chain *chain) { struct tcf_proto *tp; if (chain->p_filter_chain) RCU_INIT_POINTER(*chain->p_filter_chain, NULL); while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) { RCU_INIT_POINTER(chain->filter_chain, tp->next); tcf_chain_put(chain); tcf_proto_destroy(tp); } } static void tcf_chain_destroy(struct tcf_chain *chain) { list_del(&chain->list); kfree(chain); } static void tcf_chain_hold(struct tcf_chain *chain) { ++chain->refcnt; } struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, bool create) { struct tcf_chain *chain; list_for_each_entry(chain, &block->chain_list, list) { if (chain->index == chain_index) { tcf_chain_hold(chain); return chain; } } return create ? tcf_chain_create(block, chain_index) : NULL; } EXPORT_SYMBOL(tcf_chain_get); void tcf_chain_put(struct tcf_chain *chain) { if (--chain->refcnt == 0) tcf_chain_destroy(chain); } EXPORT_SYMBOL(tcf_chain_put); static void tcf_chain_filter_chain_ptr_set(struct tcf_chain *chain, struct tcf_proto __rcu **p_filter_chain) { chain->p_filter_chain = p_filter_chain; } static void tcf_block_offload_cmd(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei, enum tc_block_command command) { struct net_device *dev = q->dev_queue->dev; struct tc_block_offload bo = {}; if (!dev->netdev_ops->ndo_setup_tc) return; bo.command = command; bo.binder_type = ei->binder_type; bo.block = block; dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); } static void tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei) { tcf_block_offload_cmd(block, q, ei, TC_BLOCK_BIND); } static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei) { tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND); } int tcf_block_get_ext(struct tcf_block **p_block, struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, struct tcf_block_ext_info *ei) { struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL); struct tcf_chain *chain; int err; if (!block) return -ENOMEM; INIT_LIST_HEAD(&block->chain_list); INIT_LIST_HEAD(&block->cb_list); /* Create chain 0 by default, it has to be always present. */ chain = tcf_chain_create(block, 0); if (!chain) { err = -ENOMEM; goto err_chain_create; } tcf_chain_filter_chain_ptr_set(chain, p_filter_chain); block->net = qdisc_net(q); block->q = q; tcf_block_offload_bind(block, q, ei); *p_block = block; return 0; err_chain_create: kfree(block); return err; } EXPORT_SYMBOL(tcf_block_get_ext); int tcf_block_get(struct tcf_block **p_block, struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q) { struct tcf_block_ext_info ei = {0, }; return tcf_block_get_ext(p_block, p_filter_chain, q, &ei); } EXPORT_SYMBOL(tcf_block_get); static void tcf_block_put_final(struct work_struct *work) { struct tcf_block *block = container_of(work, struct tcf_block, work); struct tcf_chain *chain, *tmp; rtnl_lock(); /* Only chain 0 should be still here. */ list_for_each_entry_safe(chain, tmp, &block->chain_list, list) tcf_chain_put(chain); rtnl_unlock(); kfree(block); } /* XXX: Standalone actions are not allowed to jump to any chain, and bound * actions should be all removed after flushing. However, filters are now * destroyed in tc filter workqueue with RTNL lock, they can not race here. */ void tcf_block_put_ext(struct tcf_block *block, struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, struct tcf_block_ext_info *ei) { struct tcf_chain *chain, *tmp; if (!block) return; tcf_block_offload_unbind(block, q, ei); list_for_each_entry_safe(chain, tmp, &block->chain_list, list) tcf_chain_flush(chain); INIT_WORK(&block->work, tcf_block_put_final); /* Wait for existing RCU callbacks to cool down, make sure their works * have been queued before this. We can not flush pending works here * because we are holding the RTNL lock. */ rcu_barrier(); tcf_queue_work(&block->work); } EXPORT_SYMBOL(tcf_block_put_ext); void tcf_block_put(struct tcf_block *block) { struct tcf_block_ext_info ei = {0, }; tcf_block_put_ext(block, NULL, block->q, &ei); } EXPORT_SYMBOL(tcf_block_put); struct tcf_block_cb { struct list_head list; tc_setup_cb_t *cb; void *cb_ident; void *cb_priv; unsigned int refcnt; }; void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) { return block_cb->cb_priv; } EXPORT_SYMBOL(tcf_block_cb_priv); struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident) { struct tcf_block_cb *block_cb; list_for_each_entry(block_cb, &block->cb_list, list) if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) return block_cb; return NULL; } EXPORT_SYMBOL(tcf_block_cb_lookup); void tcf_block_cb_incref(struct tcf_block_cb *block_cb) { block_cb->refcnt++; } EXPORT_SYMBOL(tcf_block_cb_incref); unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) { return --block_cb->refcnt; } EXPORT_SYMBOL(tcf_block_cb_decref); struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv) { struct tcf_block_cb *block_cb; block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); if (!block_cb) return NULL; block_cb->cb = cb; block_cb->cb_ident = cb_ident; block_cb->cb_priv = cb_priv; list_add(&block_cb->list, &block->cb_list); return block_cb; } EXPORT_SYMBOL(__tcf_block_cb_register); int tcf_block_cb_register(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident, void *cb_priv) { struct tcf_block_cb *block_cb; block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv); return block_cb ? 0 : -ENOMEM; } EXPORT_SYMBOL(tcf_block_cb_register); void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb) { list_del(&block_cb->list); kfree(block_cb); } EXPORT_SYMBOL(__tcf_block_cb_unregister); void tcf_block_cb_unregister(struct tcf_block *block, tc_setup_cb_t *cb, void *cb_ident) { struct tcf_block_cb *block_cb; block_cb = tcf_block_cb_lookup(block, cb, cb_ident); if (!block_cb) return; __tcf_block_cb_unregister(block_cb); } EXPORT_SYMBOL(tcf_block_cb_unregister); static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, void *type_data, bool err_stop) { struct tcf_block_cb *block_cb; int ok_count = 0; int err; list_for_each_entry(block_cb, &block->cb_list, list) { err = block_cb->cb(type, type_data, block_cb->cb_priv); if (err) { if (err_stop) return err; } else { ok_count++; } } return ok_count; } /* Main classifier routine: scans classifier chain attached * to this qdisc, (optionally) tests for protocol and asks * specific classifiers. */ int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res, bool compat_mode) { __be16 protocol = tc_skb_protocol(skb); #ifdef CONFIG_NET_CLS_ACT const int max_reclassify_loop = 4; const struct tcf_proto *orig_tp = tp; const struct tcf_proto *first_tp; int limit = 0; reclassify: #endif for (; tp; tp = rcu_dereference_bh(tp->next)) { int err; if (tp->protocol != protocol && tp->protocol != htons(ETH_P_ALL)) continue; err = tp->classify(skb, tp, res); #ifdef CONFIG_NET_CLS_ACT if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { first_tp = orig_tp; goto reset; } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { first_tp = res->goto_tp; goto reset; } #endif if (err >= 0) return err; } return TC_ACT_UNSPEC; /* signal: continue lookup */ #ifdef CONFIG_NET_CLS_ACT reset: if (unlikely(limit++ >= max_reclassify_loop)) { net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", tp->q->ops->id, tp->prio & 0xffff, ntohs(tp->protocol)); return TC_ACT_SHOT; } tp = first_tp; protocol = tc_skb_protocol(skb); goto reclassify; #endif } EXPORT_SYMBOL(tcf_classify); struct tcf_chain_info { struct tcf_proto __rcu **pprev; struct tcf_proto __rcu *next; }; static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) { return rtnl_dereference(*chain_info->pprev); } static void tcf_chain_tp_insert(struct tcf_chain *chain, struct tcf_chain_info *chain_info, struct tcf_proto *tp) { if (chain->p_filter_chain && *chain_info->pprev == chain->filter_chain) rcu_assign_pointer(*chain->p_filter_chain, tp); RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); rcu_assign_pointer(*chain_info->pprev, tp); tcf_chain_hold(chain); } static void tcf_chain_tp_remove(struct tcf_chain *chain, struct tcf_chain_info *chain_info, struct tcf_proto *tp) { struct tcf_proto *next = rtnl_dereference(chain_info->next); if (chain->p_filter_chain && tp == chain->filter_chain) RCU_INIT_POINTER(*chain->p_filter_chain, next); RCU_INIT_POINTER(*chain_info->pprev, next); tcf_chain_put(chain); } static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, struct tcf_chain_info *chain_info, u32 protocol, u32 prio, bool prio_allocate) { struct tcf_proto **pprev; struct tcf_proto *tp; /* Check the chain for existence of proto-tcf with this priority */ for (pprev = &chain->filter_chain; (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { if (tp->prio >= prio) { if (tp->prio == prio) { if (prio_allocate || (tp->protocol != protocol && protocol)) return ERR_PTR(-EINVAL); } else { tp = NULL; } break; } } chain_info->pprev = pprev; chain_info->next = tp ? tp->next : NULL; return tp; } static int tcf_fill_node(struct net *net, struct sk_buff *skb, struct tcf_proto *tp, struct Qdisc *q, u32 parent, void *fh, u32 portid, u32 seq, u16 flags, int event) { struct tcmsg *tcm; struct nlmsghdr *nlh; unsigned char *b = skb_tail_pointer(skb); nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); if (!nlh) goto out_nlmsg_trim; tcm = nlmsg_data(nlh); tcm->tcm_family = AF_UNSPEC; tcm->tcm__pad1 = 0; tcm->tcm__pad2 = 0; tcm->tcm_ifindex = qdisc_dev(q)->ifindex; tcm->tcm_parent = parent; tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) goto nla_put_failure; if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) goto nla_put_failure; if (!fh) { tcm->tcm_handle = 0; } else { if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) goto nla_put_failure; } nlh->nlmsg_len = skb_tail_pointer(skb) - b; return skb->len; out_nlmsg_trim: nla_put_failure: nlmsg_trim(skb, b); return -1; } static int tfilter_notify(struct net *net, struct sk_buff *oskb, struct nlmsghdr *n, struct tcf_proto *tp, struct Qdisc *q, u32 parent, void *fh, int event, bool unicast) { struct sk_buff *skb; u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) return -ENOBUFS; if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { kfree_skb(skb); return -EINVAL; } if (unicast) return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); return rtnetlink_send(skb, net, portid, RTNLGRP_TC, n->nlmsg_flags & NLM_F_ECHO); } static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, struct nlmsghdr *n, struct tcf_proto *tp, struct Qdisc *q, u32 parent, void *fh, bool unicast, bool *last) { struct sk_buff *skb; u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; int err; skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) return -ENOBUFS; if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { kfree_skb(skb); return -EINVAL; } err = tp->ops->delete(tp, fh, last); if (err) { kfree_skb(skb); return err; } if (unicast) return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); return rtnetlink_send(skb, net, portid, RTNLGRP_TC, n->nlmsg_flags & NLM_F_ECHO); } static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, struct Qdisc *q, u32 parent, struct nlmsghdr *n, struct tcf_chain *chain, int event) { struct tcf_proto *tp; for (tp = rtnl_dereference(chain->filter_chain); tp; tp = rtnl_dereference(tp->next)) tfilter_notify(net, oskb, n, tp, q, parent, 0, event, false); } /* Add/change/delete/get a filter node */ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, struct netlink_ext_ack *extack) { struct net *net = sock_net(skb->sk); struct nlattr *tca[TCA_MAX + 1]; struct tcmsg *t; u32 protocol; u32 prio; bool prio_allocate; u32 parent; u32 chain_index; struct net_device *dev; struct Qdisc *q; struct tcf_chain_info chain_info; struct tcf_chain *chain = NULL; struct tcf_block *block; struct tcf_proto *tp; const struct Qdisc_class_ops *cops; unsigned long cl; void *fh; int err; int tp_created; if ((n->nlmsg_type != RTM_GETTFILTER) && !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) return -EPERM; replay: tp_created = 0; err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); if (err < 0) return err; t = nlmsg_data(n); protocol = TC_H_MIN(t->tcm_info); prio = TC_H_MAJ(t->tcm_info); prio_allocate = false; parent = t->tcm_parent; cl = 0; if (prio == 0) { switch (n->nlmsg_type) { case RTM_DELTFILTER: if (protocol || t->tcm_handle || tca[TCA_KIND]) return -ENOENT; break; case RTM_NEWTFILTER: /* If no priority is provided by the user, * we allocate one. */ if (n->nlmsg_flags & NLM_F_CREATE) { prio = TC_H_MAKE(0x80000000U, 0U); prio_allocate = true; break; } /* fall-through */ default: return -ENOENT; } } /* Find head of filter chain. */ /* Find link */ dev = __dev_get_by_index(net, t->tcm_ifindex); if (dev == NULL) return -ENODEV; /* Find qdisc */ if (!parent) { q = dev->qdisc; parent = q->handle; } else { q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); if (q == NULL) return -EINVAL; } /* Is it classful? */ cops = q->ops->cl_ops; if (!cops) return -EINVAL; if (!cops->tcf_block) return -EOPNOTSUPP; /* Do we search for filter, attached to class? */ if (TC_H_MIN(parent)) { cl = cops->find(q, parent); if (cl == 0) return -ENOENT; } /* And the last stroke */ block = cops->tcf_block(q, cl); if (!block) { err = -EINVAL; goto errout; } chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; if (chain_index > TC_ACT_EXT_VAL_MASK) { err = -EINVAL; goto errout; } chain = tcf_chain_get(block, chain_index, n->nlmsg_type == RTM_NEWTFILTER); if (!chain) { err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL; goto errout; } if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) { tfilter_notify_chain(net, skb, q, parent, n, chain, RTM_DELTFILTER); tcf_chain_flush(chain); err = 0; goto errout; } tp = tcf_chain_tp_find(chain, &chain_info, protocol, prio, prio_allocate); if (IS_ERR(tp)) { err = PTR_ERR(tp); goto errout; } if (tp == NULL) { /* Proto-tcf does not exist, create new one */ if (tca[TCA_KIND] == NULL || !protocol) { err = -EINVAL; goto errout; } if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags & NLM_F_CREATE)) { err = -ENOENT; goto errout; } if (prio_allocate) prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); tp = tcf_proto_create(nla_data(tca[TCA_KIND]), protocol, prio, parent, q, chain); if (IS_ERR(tp)) { err = PTR_ERR(tp); goto errout; } tp_created = 1; } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { err = -EINVAL; goto errout; } fh = tp->ops->get(tp, t->tcm_handle); if (!fh) { if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { tcf_chain_tp_remove(chain, &chain_info, tp); tfilter_notify(net, skb, n, tp, q, parent, fh, RTM_DELTFILTER, false); tcf_proto_destroy(tp); err = 0; goto errout; } if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags & NLM_F_CREATE)) { err = -ENOENT; goto errout; } } else { bool last; switch (n->nlmsg_type) { case RTM_NEWTFILTER: if (n->nlmsg_flags & NLM_F_EXCL) { if (tp_created) tcf_proto_destroy(tp); err = -EEXIST; goto errout; } break; case RTM_DELTFILTER: err = tfilter_del_notify(net, skb, n, tp, q, parent, fh, false, &last); if (err) goto errout; if (last) { tcf_chain_tp_remove(chain, &chain_info, tp); tcf_proto_destroy(tp); } goto errout; case RTM_GETTFILTER: err = tfilter_notify(net, skb, n, tp, q, parent, fh, RTM_NEWTFILTER, true); goto errout; default: err = -EINVAL; goto errout; } } err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); if (err == 0) { if (tp_created) tcf_chain_tp_insert(chain, &chain_info, tp); tfilter_notify(net, skb, n, tp, q, parent, fh, RTM_NEWTFILTER, false); } else { if (tp_created) tcf_proto_destroy(tp); } errout: if (chain) tcf_chain_put(chain); if (err == -EAGAIN) /* Replay the request. */ goto replay; return err; } struct tcf_dump_args { struct tcf_walker w; struct sk_buff *skb; struct netlink_callback *cb; struct Qdisc *q; u32 parent; }; static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) { struct tcf_dump_args *a = (void *)arg; struct net *net = sock_net(a->skb->sk); return tcf_fill_node(net, a->skb, tp, a->q, a->parent, n, NETLINK_CB(a->cb->skb).portid, a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); } static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, struct sk_buff *skb, struct netlink_callback *cb, long index_start, long *p_index) { struct net *net = sock_net(skb->sk); struct tcmsg *tcm = nlmsg_data(cb->nlh); struct tcf_dump_args arg; struct tcf_proto *tp; for (tp = rtnl_dereference(chain->filter_chain); tp; tp = rtnl_dereference(tp->next), (*p_index)++) { if (*p_index < index_start) continue; if (TC_H_MAJ(tcm->tcm_info) && TC_H_MAJ(tcm->tcm_info) != tp->prio) continue; if (TC_H_MIN(tcm->tcm_info) && TC_H_MIN(tcm->tcm_info) != tp->protocol) continue; if (*p_index > index_start) memset(&cb->args[1], 0, sizeof(cb->args) - sizeof(cb->args[0])); if (cb->args[1] == 0) { if (tcf_fill_node(net, skb, tp, q, parent, 0, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER) <= 0) return false; cb->args[1] = 1; } if (!tp->ops->walk) continue; arg.w.fn = tcf_node_dump; arg.skb = skb; arg.cb = cb; arg.q = q; arg.parent = parent; arg.w.stop = 0; arg.w.skip = cb->args[1] - 1; arg.w.count = 0; tp->ops->walk(tp, &arg.w); cb->args[1] = arg.w.count + 1; if (arg.w.stop) return false; } return true; } /* called with RTNL */ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); struct nlattr *tca[TCA_MAX + 1]; struct net_device *dev; struct Qdisc *q; struct tcf_block *block; struct tcf_chain *chain; struct tcmsg *tcm = nlmsg_data(cb->nlh); unsigned long cl = 0; const struct Qdisc_class_ops *cops; long index_start; long index; u32 parent; int err; if (nlmsg_len(cb->nlh) < sizeof(*tcm)) return skb->len; err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); if (err) return err; dev = __dev_get_by_index(net, tcm->tcm_ifindex); if (!dev) return skb->len; parent = tcm->tcm_parent; if (!parent) { q = dev->qdisc; parent = q->handle; } else { q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); } if (!q) goto out; cops = q->ops->cl_ops; if (!cops) goto out; if (!cops->tcf_block) goto out; if (TC_H_MIN(tcm->tcm_parent)) { cl = cops->find(q, tcm->tcm_parent); if (cl == 0) goto out; } block = cops->tcf_block(q, cl); if (!block) goto out; index_start = cb->args[0]; index = 0; list_for_each_entry(chain, &block->chain_list, list) { if (tca[TCA_CHAIN] && nla_get_u32(tca[TCA_CHAIN]) != chain->index) continue; if (!tcf_chain_dump(chain, q, parent, skb, cb, index_start, &index)) break; } cb->args[0] = index; out: return skb->len; } void tcf_exts_destroy(struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT LIST_HEAD(actions); ASSERT_RTNL(); tcf_exts_to_list(exts, &actions); tcf_action_destroy(&actions, TCA_ACT_UNBIND); kfree(exts->actions); exts->nr_actions = 0; #endif } EXPORT_SYMBOL(tcf_exts_destroy); int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) { #ifdef CONFIG_NET_CLS_ACT { struct tc_action *act; if (exts->police && tb[exts->police]) { act = tcf_action_init_1(net, tp, tb[exts->police], rate_tlv, "police", ovr, TCA_ACT_BIND); if (IS_ERR(act)) return PTR_ERR(act); act->type = exts->type = TCA_OLD_COMPAT; exts->actions[0] = act; exts->nr_actions = 1; } else if (exts->action && tb[exts->action]) { LIST_HEAD(actions); int err, i = 0; err = tcf_action_init(net, tp, tb[exts->action], rate_tlv, NULL, ovr, TCA_ACT_BIND, &actions); if (err) return err; list_for_each_entry(act, &actions, list) exts->actions[i++] = act; exts->nr_actions = i; } } #else if ((exts->action && tb[exts->action]) || (exts->police && tb[exts->police])) return -EOPNOTSUPP; #endif return 0; } EXPORT_SYMBOL(tcf_exts_validate); void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) { #ifdef CONFIG_NET_CLS_ACT struct tcf_exts old = *dst; *dst = *src; tcf_exts_destroy(&old); #endif } EXPORT_SYMBOL(tcf_exts_change); #ifdef CONFIG_NET_CLS_ACT static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) { if (exts->nr_actions == 0) return NULL; else return exts->actions[0]; } #endif int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT struct nlattr *nest; if (exts->action && tcf_exts_has_actions(exts)) { /* * again for backward compatible mode - we want * to work with both old and new modes of entering * tc data even if iproute2 was newer - jhs */ if (exts->type != TCA_OLD_COMPAT) { LIST_HEAD(actions); nest = nla_nest_start(skb, exts->action); if (nest == NULL) goto nla_put_failure; tcf_exts_to_list(exts, &actions); if (tcf_action_dump(skb, &actions, 0, 0) < 0) goto nla_put_failure; nla_nest_end(skb, nest); } else if (exts->police) { struct tc_action *act = tcf_exts_first_act(exts); nest = nla_nest_start(skb, exts->police); if (nest == NULL || !act) goto nla_put_failure; if (tcf_action_dump_old(skb, act, 0, 0) < 0) goto nla_put_failure; nla_nest_end(skb, nest); } } return 0; nla_put_failure: nla_nest_cancel(skb, nest); return -1; #else return 0; #endif } EXPORT_SYMBOL(tcf_exts_dump); int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) { #ifdef CONFIG_NET_CLS_ACT struct tc_action *a = tcf_exts_first_act(exts); if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) return -1; #endif return 0; } EXPORT_SYMBOL(tcf_exts_dump_stats); static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, enum tc_setup_type type, void *type_data, bool err_stop) { int ok_count = 0; #ifdef CONFIG_NET_CLS_ACT const struct tc_action *a; struct net_device *dev; int i, ret; if (!tcf_exts_has_actions(exts)) return 0; for (i = 0; i < exts->nr_actions; i++) { a = exts->actions[i]; if (!a->ops->get_dev) continue; dev = a->ops->get_dev(a); if (!dev) continue; ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); if (ret < 0) return ret; ok_count += ret; } #endif return ok_count; } int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, enum tc_setup_type type, void *type_data, bool err_stop) { int ok_count; int ret; ret = tcf_block_cb_call(block, type, type_data, err_stop); if (ret < 0) return ret; ok_count = ret; if (!exts) return ok_count; ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); if (ret < 0) return ret; ok_count += ret; return ok_count; } EXPORT_SYMBOL(tc_setup_cb_call); static int __init tc_filter_init(void) { tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); if (!tc_filter_wq) return -ENOMEM; rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0); rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0); rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, tc_dump_tfilter, 0); return 0; } subsys_initcall(tc_filter_init);