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[NET]: Protocol Independant Policy Routing Rules Framework
Derived from net/ipv/fib_rules.c Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
David S. Miller
parent
c71099acce
commit
14c0b97ddf
6 changed files with 577 additions and 2 deletions
60
include/linux/fib_rules.h
Normal file
60
include/linux/fib_rules.h
Normal file
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@ -0,0 +1,60 @@
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#ifndef __LINUX_FIB_RULES_H
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#define __LINUX_FIB_RULES_H
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#include <linux/types.h>
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#include <linux/rtnetlink.h>
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/* rule is permanent, and cannot be deleted */
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#define FIB_RULE_PERMANENT 1
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struct fib_rule_hdr
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{
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__u8 family;
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__u8 dst_len;
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__u8 src_len;
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__u8 tos;
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__u8 table;
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__u8 res1; /* reserved */
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__u8 res2; /* reserved */
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__u8 action;
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__u32 flags;
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};
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enum
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{
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FRA_UNSPEC,
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FRA_DST, /* destination address */
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FRA_SRC, /* source address */
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FRA_IFNAME, /* interface name */
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FRA_UNUSED1,
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FRA_UNUSED2,
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FRA_PRIORITY, /* priority/preference */
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FRA_UNUSED3,
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FRA_UNUSED4,
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FRA_UNUSED5,
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FRA_FWMARK, /* netfilter mark (IPv4) */
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FRA_FLOW, /* flow/class id */
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__FRA_MAX
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};
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#define FRA_MAX (__FRA_MAX - 1)
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enum
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{
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FR_ACT_UNSPEC,
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FR_ACT_TO_TBL, /* Pass to fixed table */
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FR_ACT_RES1,
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FR_ACT_RES2,
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FR_ACT_RES3,
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FR_ACT_RES4,
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FR_ACT_BLACKHOLE, /* Drop without notification */
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FR_ACT_UNREACHABLE, /* Drop with ENETUNREACH */
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FR_ACT_PROHIBIT, /* Drop with EACCES */
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__FR_ACT_MAX,
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};
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#define FR_ACT_MAX (__FR_ACT_MAX - 1)
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#endif
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90
include/net/fib_rules.h
Normal file
90
include/net/fib_rules.h
Normal file
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@ -0,0 +1,90 @@
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#ifndef __NET_FIB_RULES_H
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#define __NET_FIB_RULES_H
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#include <linux/types.h>
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#include <linux/netdevice.h>
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#include <linux/fib_rules.h>
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#include <net/flow.h>
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#include <net/netlink.h>
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struct fib_rule
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{
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struct list_head list;
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atomic_t refcnt;
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int ifindex;
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char ifname[IFNAMSIZ];
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u32 pref;
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u32 flags;
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u32 table;
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u8 action;
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struct rcu_head rcu;
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};
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struct fib_lookup_arg
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{
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void *lookup_ptr;
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void *result;
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struct fib_rule *rule;
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};
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struct fib_rules_ops
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{
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int family;
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struct list_head list;
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int rule_size;
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int (*action)(struct fib_rule *,
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struct flowi *, int,
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struct fib_lookup_arg *);
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int (*match)(struct fib_rule *,
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struct flowi *, int);
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int (*configure)(struct fib_rule *,
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struct sk_buff *,
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struct nlmsghdr *,
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struct fib_rule_hdr *,
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struct nlattr **);
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int (*compare)(struct fib_rule *,
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struct fib_rule_hdr *,
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struct nlattr **);
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int (*fill)(struct fib_rule *, struct sk_buff *,
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struct nlmsghdr *,
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struct fib_rule_hdr *);
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u32 (*default_pref)(void);
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int nlgroup;
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struct nla_policy *policy;
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struct list_head *rules_list;
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struct module *owner;
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};
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static inline void fib_rule_get(struct fib_rule *rule)
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{
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atomic_inc(&rule->refcnt);
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}
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static inline void fib_rule_put_rcu(struct rcu_head *head)
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{
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struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
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kfree(rule);
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}
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static inline void fib_rule_put(struct fib_rule *rule)
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{
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if (atomic_dec_and_test(&rule->refcnt))
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call_rcu(&rule->rcu, fib_rule_put_rcu);
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}
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extern int fib_rules_register(struct fib_rules_ops *);
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extern int fib_rules_unregister(struct fib_rules_ops *);
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extern int fib_rules_lookup(struct fib_rules_ops *,
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struct flowi *, int flags,
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struct fib_lookup_arg *);
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extern int fib_nl_newrule(struct sk_buff *,
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struct nlmsghdr *, void *);
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extern int fib_nl_delrule(struct sk_buff *,
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struct nlmsghdr *, void *);
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extern int fib_rules_dump(struct sk_buff *,
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struct netlink_callback *, int);
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#endif
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@ -251,6 +251,9 @@ config WIRELESS_EXT
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source "net/netlabel/Kconfig"
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config FIB_RULES
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bool
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endif # if NET
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endmenu # Networking
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@ -17,3 +17,4 @@ obj-$(CONFIG_NET_PKTGEN) += pktgen.o
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obj-$(CONFIG_WIRELESS_EXT) += wireless.o
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obj-$(CONFIG_NETPOLL) += netpoll.o
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obj-$(CONFIG_NET_DMA) += user_dma.o
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obj-$(CONFIG_FIB_RULES) += fib_rules.o
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416
net/core/fib_rules.c
Normal file
416
net/core/fib_rules.c
Normal file
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@ -0,0 +1,416 @@
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/*
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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/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <net/fib_rules.h>
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static LIST_HEAD(rules_ops);
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static DEFINE_SPINLOCK(rules_mod_lock);
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static void notify_rule_change(int event, struct fib_rule *rule,
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struct fib_rules_ops *ops);
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static struct fib_rules_ops *lookup_rules_ops(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, &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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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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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(&rules_mod_lock);
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list_for_each_entry(o, &rules_ops, list)
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if (ops->family == o->family)
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goto errout;
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list_add_tail_rcu(&ops->list, &rules_ops);
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err = 0;
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errout:
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spin_unlock(&rules_mod_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(fib_rules_register);
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static void 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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fib_rule_put(rule);
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}
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}
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int fib_rules_unregister(struct fib_rules_ops *ops)
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{
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int err = 0;
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struct fib_rules_ops *o;
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spin_lock(&rules_mod_lock);
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list_for_each_entry(o, &rules_ops, list) {
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if (o == ops) {
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list_del_rcu(&o->list);
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cleanup_ops(ops);
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goto out;
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}
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}
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err = -ENOENT;
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out:
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spin_unlock(&rules_mod_lock);
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synchronize_rcu();
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return err;
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}
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EXPORT_SYMBOL_GPL(fib_rules_unregister);
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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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if (rule->ifindex && (rule->ifindex != fl->iif))
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continue;
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if (!ops->match(rule, fl, flags))
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continue;
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err = ops->action(rule, fl, flags, arg);
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if (err != -EAGAIN) {
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fib_rule_get(rule);
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arg->rule = rule;
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goto out;
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}
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}
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err = -ENETUNREACH;
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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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int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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{
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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;
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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(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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if (tb[FRA_IFNAME] && nla_len(tb[FRA_IFNAME]) > IFNAMSIZ)
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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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if (tb[FRA_PRIORITY])
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rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
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if (tb[FRA_IFNAME]) {
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struct net_device *dev;
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rule->ifindex = -1;
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if (nla_strlcpy(rule->ifname, tb[FRA_IFNAME],
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IFNAMSIZ) >= IFNAMSIZ)
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goto errout_free;
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dev = __dev_get_by_name(rule->ifname);
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if (dev)
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rule->ifindex = dev->ifindex;
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}
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rule->action = frh->action;
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rule->flags = frh->flags;
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rule->table = frh->table;
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if (!rule->pref && ops->default_pref)
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rule->pref = ops->default_pref();
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err = ops->configure(rule, skb, nlh, 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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notify_rule_change(RTM_NEWRULE, rule, 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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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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int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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{
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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;
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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(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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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->table != 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_IFNAME] &&
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nla_strcmp(tb[FRA_IFNAME], rule->ifname))
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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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|
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list_del_rcu(&rule->list);
|
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synchronize_rcu();
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notify_rule_change(RTM_DELRULE, rule, ops);
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fib_rule_put(rule);
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rules_ops_put(ops);
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return 0;
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}
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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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|
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static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
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u32 pid, u32 seq, int type, int flags,
|
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struct fib_rules_ops *ops)
|
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{
|
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struct nlmsghdr *nlh;
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struct fib_rule_hdr *frh;
|
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|
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nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
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if (nlh == NULL)
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return -1;
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frh = nlmsg_data(nlh);
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frh->table = rule->table;
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frh->res1 = 0;
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frh->res2 = 0;
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frh->action = rule->action;
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frh->flags = rule->flags;
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|
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if (rule->ifname[0])
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NLA_PUT_STRING(skb, FRA_IFNAME, rule->ifname);
|
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|
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if (rule->pref)
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NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
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|
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if (ops->fill(rule, skb, nlh, frh) < 0)
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goto nla_put_failure;
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|
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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return nlmsg_cancel(skb, nlh);
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}
|
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|
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int fib_rules_dump(struct sk_buff *skb, struct netlink_callback *cb, int family)
|
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{
|
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int idx = 0;
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struct fib_rule *rule;
|
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struct fib_rules_ops *ops;
|
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|
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ops = lookup_rules_ops(family);
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if (ops == NULL)
|
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return -EAFNOSUPPORT;
|
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|
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rcu_read_lock();
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list_for_each_entry(rule, ops->rules_list, list) {
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if (idx < cb->args[0])
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goto skip;
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|
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if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
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cb->nlh->nlmsg_seq, RTM_NEWRULE,
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NLM_F_MULTI, ops) < 0)
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break;
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skip:
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idx++;
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}
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rcu_read_unlock();
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cb->args[0] = idx;
|
||||
rules_ops_put(ops);
|
||||
|
||||
return skb->len;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(fib_rules_dump);
|
||||
|
||||
static void notify_rule_change(int event, struct fib_rule *rule,
|
||||
struct fib_rules_ops *ops)
|
||||
{
|
||||
int size = nlmsg_total_size(sizeof(struct fib_rule_hdr) + 128);
|
||||
struct sk_buff *skb = alloc_skb(size, GFP_KERNEL);
|
||||
|
||||
if (skb == NULL)
|
||||
netlink_set_err(rtnl, 0, ops->nlgroup, ENOBUFS);
|
||||
else if (fib_nl_fill_rule(skb, rule, 0, 0, event, 0, ops) < 0) {
|
||||
kfree_skb(skb);
|
||||
netlink_set_err(rtnl, 0, ops->nlgroup, EINVAL);
|
||||
} else
|
||||
netlink_broadcast(rtnl, skb, 0, ops->nlgroup, GFP_KERNEL);
|
||||
}
|
||||
|
||||
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->ifindex == -1 &&
|
||||
strcmp(dev->name, rule->ifname) == 0)
|
||||
rule->ifindex = 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->ifindex == dev->ifindex)
|
||||
rule->ifindex = -1;
|
||||
}
|
||||
|
||||
|
||||
static int fib_rules_event(struct notifier_block *this, unsigned long event,
|
||||
void *ptr)
|
||||
{
|
||||
struct net_device *dev = ptr;
|
||||
struct fib_rules_ops *ops;
|
||||
|
||||
ASSERT_RTNL();
|
||||
rcu_read_lock();
|
||||
|
||||
switch (event) {
|
||||
case NETDEV_REGISTER:
|
||||
list_for_each_entry(ops, &rules_ops, list)
|
||||
attach_rules(ops->rules_list, dev);
|
||||
break;
|
||||
|
||||
case NETDEV_UNREGISTER:
|
||||
list_for_each_entry(ops, &rules_ops, list)
|
||||
detach_rules(ops->rules_list, dev);
|
||||
break;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
static struct notifier_block fib_rules_notifier = {
|
||||
.notifier_call = fib_rules_event,
|
||||
};
|
||||
|
||||
static int __init fib_rules_init(void)
|
||||
{
|
||||
return register_netdevice_notifier(&fib_rules_notifier);
|
||||
}
|
||||
|
||||
subsys_initcall(fib_rules_init);
|
||||
|
|
@ -49,6 +49,7 @@
|
|||
#include <net/udp.h>
|
||||
#include <net/sock.h>
|
||||
#include <net/pkt_sched.h>
|
||||
#include <net/fib_rules.h>
|
||||
#include <net/netlink.h>
|
||||
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
|
||||
#include <linux/wireless.h>
|
||||
|
|
@ -103,7 +104,7 @@ static const int rtm_min[RTM_NR_FAMILIES] =
|
|||
[RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
|
||||
[RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
|
||||
[RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)),
|
||||
[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
|
||||
[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
|
||||
[RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
|
||||
[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
|
||||
[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
|
||||
|
|
@ -120,7 +121,7 @@ static const int rta_max[RTM_NR_FAMILIES] =
|
|||
[RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
|
||||
[RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
|
||||
[RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX,
|
||||
[RTM_FAM(RTM_NEWRULE)] = RTA_MAX,
|
||||
[RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
|
||||
[RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
|
||||
[RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
|
||||
[RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
|
||||
|
|
@ -757,6 +758,10 @@ static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
|
|||
[RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
|
||||
[RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
|
||||
[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
|
||||
#ifdef CONFIG_FIB_RULES
|
||||
[RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
|
||||
[RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
|
||||
#endif
|
||||
[RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
|
||||
[RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
|
||||
[RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
|
||||
|
|
|
|||
Loading…
Reference in a new issue