![Jiri Pirko](/assets/img/avatar_default.png)
So far, only net_device * could be passed along with netdevice notifier event. This patch provides a possibility to pass custom structure able to provide info that event listener needs to know. Signed-off-by: Jiri Pirko <jiri@resnulli.us> v2->v3: fix typo on simeth shortened dev_getter shortened notifier_info struct name v1->v2: fix notifier_call parameter in call_netdevice_notifier() Signed-off-by: David S. Miller <davem@davemloft.net>
773 lines
17 KiB
C
773 lines
17 KiB
C
/*
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* net/core/fib_rules.c Generic Routing Rules
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/fib_rules.h>
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int fib_default_rule_add(struct fib_rules_ops *ops,
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u32 pref, u32 table, u32 flags)
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{
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struct fib_rule *r;
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r = kzalloc(ops->rule_size, GFP_KERNEL);
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if (r == NULL)
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return -ENOMEM;
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atomic_set(&r->refcnt, 1);
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r->action = FR_ACT_TO_TBL;
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r->pref = pref;
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r->table = table;
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r->flags = flags;
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r->fr_net = hold_net(ops->fro_net);
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/* The lock is not required here, the list in unreacheable
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* at the moment this function is called */
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list_add_tail(&r->list, &ops->rules_list);
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return 0;
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}
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EXPORT_SYMBOL(fib_default_rule_add);
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u32 fib_default_rule_pref(struct fib_rules_ops *ops)
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{
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struct list_head *pos;
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struct fib_rule *rule;
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if (!list_empty(&ops->rules_list)) {
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pos = ops->rules_list.next;
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if (pos->next != &ops->rules_list) {
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rule = list_entry(pos->next, struct fib_rule, list);
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if (rule->pref)
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return rule->pref - 1;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(fib_default_rule_pref);
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static void notify_rule_change(int event, struct fib_rule *rule,
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struct fib_rules_ops *ops, struct nlmsghdr *nlh,
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u32 pid);
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static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
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{
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struct fib_rules_ops *ops;
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rcu_read_lock();
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list_for_each_entry_rcu(ops, &net->rules_ops, list) {
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if (ops->family == family) {
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if (!try_module_get(ops->owner))
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ops = NULL;
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rcu_read_unlock();
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return ops;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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static void rules_ops_put(struct fib_rules_ops *ops)
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{
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if (ops)
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module_put(ops->owner);
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}
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static void flush_route_cache(struct fib_rules_ops *ops)
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{
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if (ops->flush_cache)
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ops->flush_cache(ops);
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}
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static int __fib_rules_register(struct fib_rules_ops *ops)
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{
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int err = -EEXIST;
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struct fib_rules_ops *o;
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struct net *net;
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net = ops->fro_net;
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if (ops->rule_size < sizeof(struct fib_rule))
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return -EINVAL;
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if (ops->match == NULL || ops->configure == NULL ||
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ops->compare == NULL || ops->fill == NULL ||
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ops->action == NULL)
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return -EINVAL;
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spin_lock(&net->rules_mod_lock);
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list_for_each_entry(o, &net->rules_ops, list)
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if (ops->family == o->family)
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goto errout;
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hold_net(net);
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list_add_tail_rcu(&ops->list, &net->rules_ops);
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err = 0;
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errout:
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spin_unlock(&net->rules_mod_lock);
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return err;
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}
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struct fib_rules_ops *
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fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
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{
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struct fib_rules_ops *ops;
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int err;
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ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
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if (ops == NULL)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&ops->rules_list);
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ops->fro_net = net;
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err = __fib_rules_register(ops);
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if (err) {
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kfree(ops);
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ops = ERR_PTR(err);
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}
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return ops;
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}
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EXPORT_SYMBOL_GPL(fib_rules_register);
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static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
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{
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struct fib_rule *rule, *tmp;
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list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
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list_del_rcu(&rule->list);
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if (ops->delete)
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ops->delete(rule);
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fib_rule_put(rule);
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}
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}
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static void fib_rules_put_rcu(struct rcu_head *head)
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{
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struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
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struct net *net = ops->fro_net;
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release_net(net);
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kfree(ops);
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}
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void fib_rules_unregister(struct fib_rules_ops *ops)
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{
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struct net *net = ops->fro_net;
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spin_lock(&net->rules_mod_lock);
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list_del_rcu(&ops->list);
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fib_rules_cleanup_ops(ops);
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spin_unlock(&net->rules_mod_lock);
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call_rcu(&ops->rcu, fib_rules_put_rcu);
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}
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EXPORT_SYMBOL_GPL(fib_rules_unregister);
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static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
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struct flowi *fl, int flags)
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{
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int ret = 0;
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if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
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goto out;
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if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
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goto out;
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if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
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goto out;
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ret = ops->match(rule, fl, flags);
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out:
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return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
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}
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int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
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int flags, struct fib_lookup_arg *arg)
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{
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struct fib_rule *rule;
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int err;
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rcu_read_lock();
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list_for_each_entry_rcu(rule, &ops->rules_list, list) {
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jumped:
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if (!fib_rule_match(rule, ops, fl, flags))
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continue;
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if (rule->action == FR_ACT_GOTO) {
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struct fib_rule *target;
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target = rcu_dereference(rule->ctarget);
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if (target == NULL) {
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continue;
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} else {
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rule = target;
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goto jumped;
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}
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} else if (rule->action == FR_ACT_NOP)
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continue;
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else
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err = ops->action(rule, fl, flags, arg);
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if (err != -EAGAIN) {
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if ((arg->flags & FIB_LOOKUP_NOREF) ||
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likely(atomic_inc_not_zero(&rule->refcnt))) {
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arg->rule = rule;
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goto out;
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}
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break;
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}
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}
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err = -ESRCH;
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out:
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rcu_read_unlock();
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return err;
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}
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EXPORT_SYMBOL_GPL(fib_rules_lookup);
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static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
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struct fib_rules_ops *ops)
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{
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int err = -EINVAL;
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if (frh->src_len)
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if (tb[FRA_SRC] == NULL ||
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frh->src_len > (ops->addr_size * 8) ||
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nla_len(tb[FRA_SRC]) != ops->addr_size)
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goto errout;
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if (frh->dst_len)
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if (tb[FRA_DST] == NULL ||
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frh->dst_len > (ops->addr_size * 8) ||
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nla_len(tb[FRA_DST]) != ops->addr_size)
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goto errout;
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err = 0;
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errout:
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return err;
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}
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static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh)
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{
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struct net *net = sock_net(skb->sk);
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struct fib_rule_hdr *frh = nlmsg_data(nlh);
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struct fib_rules_ops *ops = NULL;
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struct fib_rule *rule, *r, *last = NULL;
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struct nlattr *tb[FRA_MAX+1];
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int err = -EINVAL, unresolved = 0;
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if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
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goto errout;
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ops = lookup_rules_ops(net, frh->family);
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if (ops == NULL) {
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err = -EAFNOSUPPORT;
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goto errout;
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}
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err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
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if (err < 0)
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goto errout;
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err = validate_rulemsg(frh, tb, ops);
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if (err < 0)
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goto errout;
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rule = kzalloc(ops->rule_size, GFP_KERNEL);
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if (rule == NULL) {
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err = -ENOMEM;
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goto errout;
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}
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rule->fr_net = hold_net(net);
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if (tb[FRA_PRIORITY])
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rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
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if (tb[FRA_IIFNAME]) {
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struct net_device *dev;
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rule->iifindex = -1;
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nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
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dev = __dev_get_by_name(net, rule->iifname);
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if (dev)
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rule->iifindex = dev->ifindex;
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}
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if (tb[FRA_OIFNAME]) {
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struct net_device *dev;
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rule->oifindex = -1;
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nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
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dev = __dev_get_by_name(net, rule->oifname);
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if (dev)
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rule->oifindex = dev->ifindex;
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}
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if (tb[FRA_FWMARK]) {
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rule->mark = nla_get_u32(tb[FRA_FWMARK]);
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if (rule->mark)
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/* compatibility: if the mark value is non-zero all bits
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* are compared unless a mask is explicitly specified.
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*/
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rule->mark_mask = 0xFFFFFFFF;
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}
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if (tb[FRA_FWMASK])
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rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
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rule->action = frh->action;
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rule->flags = frh->flags;
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rule->table = frh_get_table(frh, tb);
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if (!tb[FRA_PRIORITY] && ops->default_pref)
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rule->pref = ops->default_pref(ops);
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err = -EINVAL;
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if (tb[FRA_GOTO]) {
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if (rule->action != FR_ACT_GOTO)
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goto errout_free;
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rule->target = nla_get_u32(tb[FRA_GOTO]);
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/* Backward jumps are prohibited to avoid endless loops */
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if (rule->target <= rule->pref)
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goto errout_free;
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list_for_each_entry(r, &ops->rules_list, list) {
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if (r->pref == rule->target) {
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RCU_INIT_POINTER(rule->ctarget, r);
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break;
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}
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}
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if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
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unresolved = 1;
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} else if (rule->action == FR_ACT_GOTO)
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goto errout_free;
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err = ops->configure(rule, skb, frh, tb);
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if (err < 0)
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goto errout_free;
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list_for_each_entry(r, &ops->rules_list, list) {
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if (r->pref > rule->pref)
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break;
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last = r;
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}
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fib_rule_get(rule);
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if (last)
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list_add_rcu(&rule->list, &last->list);
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else
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list_add_rcu(&rule->list, &ops->rules_list);
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if (ops->unresolved_rules) {
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/*
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* There are unresolved goto rules in the list, check if
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* any of them are pointing to this new rule.
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*/
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list_for_each_entry(r, &ops->rules_list, list) {
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if (r->action == FR_ACT_GOTO &&
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r->target == rule->pref &&
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rtnl_dereference(r->ctarget) == NULL) {
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rcu_assign_pointer(r->ctarget, rule);
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if (--ops->unresolved_rules == 0)
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break;
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}
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}
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}
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if (rule->action == FR_ACT_GOTO)
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ops->nr_goto_rules++;
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if (unresolved)
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ops->unresolved_rules++;
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notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
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flush_route_cache(ops);
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rules_ops_put(ops);
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return 0;
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errout_free:
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release_net(rule->fr_net);
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kfree(rule);
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errout:
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rules_ops_put(ops);
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return err;
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}
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static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh)
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{
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struct net *net = sock_net(skb->sk);
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struct fib_rule_hdr *frh = nlmsg_data(nlh);
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struct fib_rules_ops *ops = NULL;
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struct fib_rule *rule, *tmp;
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struct nlattr *tb[FRA_MAX+1];
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int err = -EINVAL;
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if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
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goto errout;
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ops = lookup_rules_ops(net, frh->family);
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if (ops == NULL) {
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err = -EAFNOSUPPORT;
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goto errout;
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}
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err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
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if (err < 0)
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goto errout;
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err = validate_rulemsg(frh, tb, ops);
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if (err < 0)
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goto errout;
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list_for_each_entry(rule, &ops->rules_list, list) {
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if (frh->action && (frh->action != rule->action))
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continue;
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if (frh->table && (frh_get_table(frh, tb) != rule->table))
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continue;
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if (tb[FRA_PRIORITY] &&
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(rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
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continue;
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if (tb[FRA_IIFNAME] &&
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nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
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continue;
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if (tb[FRA_OIFNAME] &&
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nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
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continue;
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if (tb[FRA_FWMARK] &&
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(rule->mark != nla_get_u32(tb[FRA_FWMARK])))
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continue;
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if (tb[FRA_FWMASK] &&
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(rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
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continue;
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if (!ops->compare(rule, frh, tb))
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continue;
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if (rule->flags & FIB_RULE_PERMANENT) {
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err = -EPERM;
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goto errout;
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}
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list_del_rcu(&rule->list);
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if (rule->action == FR_ACT_GOTO) {
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ops->nr_goto_rules--;
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if (rtnl_dereference(rule->ctarget) == NULL)
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ops->unresolved_rules--;
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}
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/*
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* Check if this rule is a target to any of them. If so,
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* disable them. As this operation is eventually very
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* expensive, it is only performed if goto rules have
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* actually been added.
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*/
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if (ops->nr_goto_rules > 0) {
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list_for_each_entry(tmp, &ops->rules_list, list) {
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if (rtnl_dereference(tmp->ctarget) == rule) {
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RCU_INIT_POINTER(tmp->ctarget, NULL);
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ops->unresolved_rules++;
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}
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}
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}
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notify_rule_change(RTM_DELRULE, rule, ops, nlh,
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NETLINK_CB(skb).portid);
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if (ops->delete)
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ops->delete(rule);
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fib_rule_put(rule);
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flush_route_cache(ops);
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rules_ops_put(ops);
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return 0;
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}
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err = -ENOENT;
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errout:
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rules_ops_put(ops);
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return err;
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}
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static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
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struct fib_rule *rule)
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{
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size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
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+ nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
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+ nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
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+ nla_total_size(4) /* FRA_PRIORITY */
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+ nla_total_size(4) /* FRA_TABLE */
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+ nla_total_size(4) /* FRA_FWMARK */
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+ nla_total_size(4); /* FRA_FWMASK */
|
|
|
|
if (ops->nlmsg_payload)
|
|
payload += ops->nlmsg_payload(rule);
|
|
|
|
return payload;
|
|
}
|
|
|
|
static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
|
|
u32 pid, u32 seq, int type, int flags,
|
|
struct fib_rules_ops *ops)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct fib_rule_hdr *frh;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
frh = nlmsg_data(nlh);
|
|
frh->family = ops->family;
|
|
frh->table = rule->table;
|
|
if (nla_put_u32(skb, FRA_TABLE, rule->table))
|
|
goto nla_put_failure;
|
|
frh->res1 = 0;
|
|
frh->res2 = 0;
|
|
frh->action = rule->action;
|
|
frh->flags = rule->flags;
|
|
|
|
if (rule->action == FR_ACT_GOTO &&
|
|
rcu_access_pointer(rule->ctarget) == NULL)
|
|
frh->flags |= FIB_RULE_UNRESOLVED;
|
|
|
|
if (rule->iifname[0]) {
|
|
if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
|
|
goto nla_put_failure;
|
|
if (rule->iifindex == -1)
|
|
frh->flags |= FIB_RULE_IIF_DETACHED;
|
|
}
|
|
|
|
if (rule->oifname[0]) {
|
|
if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
|
|
goto nla_put_failure;
|
|
if (rule->oifindex == -1)
|
|
frh->flags |= FIB_RULE_OIF_DETACHED;
|
|
}
|
|
|
|
if ((rule->pref &&
|
|
nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
|
|
(rule->mark &&
|
|
nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
|
|
((rule->mark_mask || rule->mark) &&
|
|
nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
|
|
(rule->target &&
|
|
nla_put_u32(skb, FRA_GOTO, rule->target)))
|
|
goto nla_put_failure;
|
|
if (ops->fill(rule, skb, frh) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct fib_rules_ops *ops)
|
|
{
|
|
int idx = 0;
|
|
struct fib_rule *rule;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(rule, &ops->rules_list, list) {
|
|
if (idx < cb->args[1])
|
|
goto skip;
|
|
|
|
if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWRULE,
|
|
NLM_F_MULTI, ops) < 0)
|
|
break;
|
|
skip:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
cb->args[1] = idx;
|
|
rules_ops_put(ops);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct fib_rules_ops *ops;
|
|
int idx = 0, family;
|
|
|
|
family = rtnl_msg_family(cb->nlh);
|
|
if (family != AF_UNSPEC) {
|
|
/* Protocol specific dump request */
|
|
ops = lookup_rules_ops(net, family);
|
|
if (ops == NULL)
|
|
return -EAFNOSUPPORT;
|
|
|
|
return dump_rules(skb, cb, ops);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ops, &net->rules_ops, list) {
|
|
if (idx < cb->args[0] || !try_module_get(ops->owner))
|
|
goto skip;
|
|
|
|
if (dump_rules(skb, cb, ops) < 0)
|
|
break;
|
|
|
|
cb->args[1] = 0;
|
|
skip:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static void notify_rule_change(int event, struct fib_rule *rule,
|
|
struct fib_rules_ops *ops, struct nlmsghdr *nlh,
|
|
u32 pid)
|
|
{
|
|
struct net *net;
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
net = ops->fro_net;
|
|
skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, ops->nlgroup, err);
|
|
}
|
|
|
|
static void attach_rules(struct list_head *rules, struct net_device *dev)
|
|
{
|
|
struct fib_rule *rule;
|
|
|
|
list_for_each_entry(rule, rules, list) {
|
|
if (rule->iifindex == -1 &&
|
|
strcmp(dev->name, rule->iifname) == 0)
|
|
rule->iifindex = dev->ifindex;
|
|
if (rule->oifindex == -1 &&
|
|
strcmp(dev->name, rule->oifname) == 0)
|
|
rule->oifindex = dev->ifindex;
|
|
}
|
|
}
|
|
|
|
static void detach_rules(struct list_head *rules, struct net_device *dev)
|
|
{
|
|
struct fib_rule *rule;
|
|
|
|
list_for_each_entry(rule, rules, list) {
|
|
if (rule->iifindex == dev->ifindex)
|
|
rule->iifindex = -1;
|
|
if (rule->oifindex == dev->ifindex)
|
|
rule->oifindex = -1;
|
|
}
|
|
}
|
|
|
|
|
|
static int fib_rules_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
struct fib_rules_ops *ops;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
list_for_each_entry(ops, &net->rules_ops, list)
|
|
attach_rules(&ops->rules_list, dev);
|
|
break;
|
|
|
|
case NETDEV_UNREGISTER:
|
|
list_for_each_entry(ops, &net->rules_ops, list)
|
|
detach_rules(&ops->rules_list, dev);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block fib_rules_notifier = {
|
|
.notifier_call = fib_rules_event,
|
|
};
|
|
|
|
static int __net_init fib_rules_net_init(struct net *net)
|
|
{
|
|
INIT_LIST_HEAD(&net->rules_ops);
|
|
spin_lock_init(&net->rules_mod_lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct pernet_operations fib_rules_net_ops = {
|
|
.init = fib_rules_net_init,
|
|
};
|
|
|
|
static int __init fib_rules_init(void)
|
|
{
|
|
int err;
|
|
rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
|
|
|
|
err = register_pernet_subsys(&fib_rules_net_ops);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
err = register_netdevice_notifier(&fib_rules_notifier);
|
|
if (err < 0)
|
|
goto fail_unregister;
|
|
|
|
return 0;
|
|
|
|
fail_unregister:
|
|
unregister_pernet_subsys(&fib_rules_net_ops);
|
|
fail:
|
|
rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
|
|
rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
|
|
rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
|
|
return err;
|
|
}
|
|
|
|
subsys_initcall(fib_rules_init);
|