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https://github.com/edk2-porting/linux-next.git
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e783bb00ad
commit0bbbf0e7d0("ipmr, ip6mr: Unite creation of new mr_table") refactored ipmr_new_table, so that it now returns NULL when mr_table_alloc fails. Unfortunately, all callers of ipmr_new_table expect an ERR_PTR. This can result in NULL deref, for example when ipmr_rules_exit calls ipmr_free_table with NULL net->ipv4.mrt in the !CONFIG_IP_MROUTE_MULTIPLE_TABLES version. This patch makes mr_table_alloc return errors, and changes ip6mr_new_table and its callers to return/expect error pointers as well. It also removes the version of mr_table_alloc defined under !CONFIG_IP_MROUTE_COMMON, since it is never used. Fixes:0bbbf0e7d0("ipmr, ip6mr: Unite creation of new mr_table") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
465 lines
12 KiB
C
465 lines
12 KiB
C
#ifndef __LINUX_MROUTE_BASE_H
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#define __LINUX_MROUTE_BASE_H
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#include <linux/netdevice.h>
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#include <linux/rhashtable.h>
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#include <linux/spinlock.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_notifier.h>
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/**
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* struct vif_device - interface representor for multicast routing
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* @dev: network device being used
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* @bytes_in: statistic; bytes ingressing
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* @bytes_out: statistic; bytes egresing
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* @pkt_in: statistic; packets ingressing
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* @pkt_out: statistic; packets egressing
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* @rate_limit: Traffic shaping (NI)
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* @threshold: TTL threshold
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* @flags: Control flags
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* @link: Physical interface index
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* @dev_parent_id: device parent id
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* @local: Local address
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* @remote: Remote address for tunnels
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*/
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struct vif_device {
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struct net_device *dev;
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unsigned long bytes_in, bytes_out;
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unsigned long pkt_in, pkt_out;
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unsigned long rate_limit;
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unsigned char threshold;
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unsigned short flags;
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int link;
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/* Currently only used by ipmr */
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struct netdev_phys_item_id dev_parent_id;
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__be32 local, remote;
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};
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struct vif_entry_notifier_info {
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struct fib_notifier_info info;
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struct net_device *dev;
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unsigned short vif_index;
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unsigned short vif_flags;
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u32 tb_id;
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};
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static inline int mr_call_vif_notifier(struct notifier_block *nb,
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struct net *net,
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unsigned short family,
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enum fib_event_type event_type,
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struct vif_device *vif,
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unsigned short vif_index, u32 tb_id)
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{
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struct vif_entry_notifier_info info = {
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.info = {
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.family = family,
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.net = net,
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},
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.dev = vif->dev,
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.vif_index = vif_index,
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.vif_flags = vif->flags,
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.tb_id = tb_id,
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};
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return call_fib_notifier(nb, net, event_type, &info.info);
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}
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static inline int mr_call_vif_notifiers(struct net *net,
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unsigned short family,
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enum fib_event_type event_type,
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struct vif_device *vif,
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unsigned short vif_index, u32 tb_id,
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unsigned int *ipmr_seq)
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{
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struct vif_entry_notifier_info info = {
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.info = {
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.family = family,
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.net = net,
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},
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.dev = vif->dev,
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.vif_index = vif_index,
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.vif_flags = vif->flags,
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.tb_id = tb_id,
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};
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ASSERT_RTNL();
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(*ipmr_seq)++;
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return call_fib_notifiers(net, event_type, &info.info);
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}
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#ifndef MAXVIFS
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/* This one is nasty; value is defined in uapi using different symbols for
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* mroute and morute6 but both map into same 32.
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*/
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#define MAXVIFS 32
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#endif
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#define VIF_EXISTS(_mrt, _idx) (!!((_mrt)->vif_table[_idx].dev))
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/* mfc_flags:
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* MFC_STATIC - the entry was added statically (not by a routing daemon)
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* MFC_OFFLOAD - the entry was offloaded to the hardware
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*/
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enum {
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MFC_STATIC = BIT(0),
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MFC_OFFLOAD = BIT(1),
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};
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/**
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* struct mr_mfc - common multicast routing entries
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* @mnode: rhashtable list
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* @mfc_parent: source interface (iif)
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* @mfc_flags: entry flags
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* @expires: unresolved entry expire time
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* @unresolved: unresolved cached skbs
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* @last_assert: time of last assert
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* @minvif: minimum VIF id
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* @maxvif: maximum VIF id
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* @bytes: bytes that have passed for this entry
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* @pkt: packets that have passed for this entry
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* @wrong_if: number of wrong source interface hits
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* @lastuse: time of last use of the group (traffic or update)
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* @ttls: OIF TTL threshold array
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* @refcount: reference count for this entry
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* @list: global entry list
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* @rcu: used for entry destruction
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* @free: Operation used for freeing an entry under RCU
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*/
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struct mr_mfc {
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struct rhlist_head mnode;
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unsigned short mfc_parent;
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int mfc_flags;
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union {
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struct {
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unsigned long expires;
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struct sk_buff_head unresolved;
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} unres;
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struct {
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unsigned long last_assert;
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int minvif;
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int maxvif;
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unsigned long bytes;
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unsigned long pkt;
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unsigned long wrong_if;
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unsigned long lastuse;
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unsigned char ttls[MAXVIFS];
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refcount_t refcount;
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} res;
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} mfc_un;
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struct list_head list;
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struct rcu_head rcu;
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void (*free)(struct rcu_head *head);
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};
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static inline void mr_cache_put(struct mr_mfc *c)
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{
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if (refcount_dec_and_test(&c->mfc_un.res.refcount))
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call_rcu(&c->rcu, c->free);
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}
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static inline void mr_cache_hold(struct mr_mfc *c)
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{
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refcount_inc(&c->mfc_un.res.refcount);
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}
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struct mfc_entry_notifier_info {
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struct fib_notifier_info info;
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struct mr_mfc *mfc;
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u32 tb_id;
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};
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static inline int mr_call_mfc_notifier(struct notifier_block *nb,
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struct net *net,
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unsigned short family,
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enum fib_event_type event_type,
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struct mr_mfc *mfc, u32 tb_id)
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{
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struct mfc_entry_notifier_info info = {
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.info = {
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.family = family,
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.net = net,
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},
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.mfc = mfc,
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.tb_id = tb_id
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};
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return call_fib_notifier(nb, net, event_type, &info.info);
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}
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static inline int mr_call_mfc_notifiers(struct net *net,
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unsigned short family,
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enum fib_event_type event_type,
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struct mr_mfc *mfc, u32 tb_id,
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unsigned int *ipmr_seq)
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{
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struct mfc_entry_notifier_info info = {
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.info = {
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.family = family,
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.net = net,
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},
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.mfc = mfc,
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.tb_id = tb_id
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};
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ASSERT_RTNL();
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(*ipmr_seq)++;
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return call_fib_notifiers(net, event_type, &info.info);
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}
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struct mr_table;
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/**
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* struct mr_table_ops - callbacks and info for protocol-specific ops
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* @rht_params: parameters for accessing the MFC hash
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* @cmparg_any: a hash key to be used for matching on (*,*) routes
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*/
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struct mr_table_ops {
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const struct rhashtable_params *rht_params;
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void *cmparg_any;
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};
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/**
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* struct mr_table - a multicast routing table
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* @list: entry within a list of multicast routing tables
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* @net: net where this table belongs
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* @ops: protocol specific operations
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* @id: identifier of the table
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* @mroute_sk: socket associated with the table
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* @ipmr_expire_timer: timer for handling unresolved routes
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* @mfc_unres_queue: list of unresolved MFC entries
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* @vif_table: array containing all possible vifs
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* @mfc_hash: Hash table of all resolved routes for easy lookup
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* @mfc_cache_list: list of resovled routes for possible traversal
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* @maxvif: Identifier of highest value vif currently in use
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* @cache_resolve_queue_len: current size of unresolved queue
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* @mroute_do_assert: Whether to inform userspace on wrong ingress
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* @mroute_do_pim: Whether to receive IGMP PIMv1
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* @mroute_reg_vif_num: PIM-device vif index
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*/
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struct mr_table {
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struct list_head list;
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possible_net_t net;
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struct mr_table_ops ops;
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u32 id;
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struct sock __rcu *mroute_sk;
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struct timer_list ipmr_expire_timer;
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struct list_head mfc_unres_queue;
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struct vif_device vif_table[MAXVIFS];
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struct rhltable mfc_hash;
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struct list_head mfc_cache_list;
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int maxvif;
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atomic_t cache_resolve_queue_len;
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bool mroute_do_assert;
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bool mroute_do_pim;
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int mroute_reg_vif_num;
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};
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#ifdef CONFIG_IP_MROUTE_COMMON
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void vif_device_init(struct vif_device *v,
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struct net_device *dev,
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unsigned long rate_limit,
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unsigned char threshold,
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unsigned short flags,
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unsigned short get_iflink_mask);
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struct mr_table *
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mr_table_alloc(struct net *net, u32 id,
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struct mr_table_ops *ops,
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void (*expire_func)(struct timer_list *t),
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void (*table_set)(struct mr_table *mrt,
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struct net *net));
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/* These actually return 'struct mr_mfc *', but to avoid need for explicit
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* castings they simply return void.
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*/
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void *mr_mfc_find_parent(struct mr_table *mrt,
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void *hasharg, int parent);
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void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi);
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void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg);
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int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
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struct mr_mfc *c, struct rtmsg *rtm);
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int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
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struct mr_table *(*iter)(struct net *net,
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struct mr_table *mrt),
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int (*fill)(struct mr_table *mrt,
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struct sk_buff *skb,
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u32 portid, u32 seq, struct mr_mfc *c,
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int cmd, int flags),
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spinlock_t *lock);
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int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
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int (*rules_dump)(struct net *net,
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struct notifier_block *nb),
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struct mr_table *(*mr_iter)(struct net *net,
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struct mr_table *mrt),
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rwlock_t *mrt_lock);
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#else
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static inline void vif_device_init(struct vif_device *v,
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struct net_device *dev,
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unsigned long rate_limit,
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unsigned char threshold,
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unsigned short flags,
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unsigned short get_iflink_mask)
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{
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}
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static inline void *mr_mfc_find_parent(struct mr_table *mrt,
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void *hasharg, int parent)
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{
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return NULL;
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}
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static inline void *mr_mfc_find_any_parent(struct mr_table *mrt,
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int vifi)
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{
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return NULL;
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}
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static inline struct mr_mfc *mr_mfc_find_any(struct mr_table *mrt,
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int vifi, void *hasharg)
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{
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return NULL;
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}
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static inline int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
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struct mr_mfc *c, struct rtmsg *rtm)
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{
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return -EINVAL;
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}
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static inline int
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mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
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struct mr_table *(*iter)(struct net *net,
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struct mr_table *mrt),
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int (*fill)(struct mr_table *mrt,
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struct sk_buff *skb,
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u32 portid, u32 seq, struct mr_mfc *c,
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int cmd, int flags),
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spinlock_t *lock)
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{
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return -EINVAL;
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}
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static inline int mr_dump(struct net *net, struct notifier_block *nb,
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unsigned short family,
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int (*rules_dump)(struct net *net,
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struct notifier_block *nb),
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struct mr_table *(*mr_iter)(struct net *net,
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struct mr_table *mrt),
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rwlock_t *mrt_lock)
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{
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return -EINVAL;
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}
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#endif
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static inline void *mr_mfc_find(struct mr_table *mrt, void *hasharg)
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{
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return mr_mfc_find_parent(mrt, hasharg, -1);
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}
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#ifdef CONFIG_PROC_FS
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struct mr_vif_iter {
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struct seq_net_private p;
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struct mr_table *mrt;
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int ct;
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};
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struct mr_mfc_iter {
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struct seq_net_private p;
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struct mr_table *mrt;
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struct list_head *cache;
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/* Lock protecting the mr_table's unresolved queue */
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spinlock_t *lock;
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};
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#ifdef CONFIG_IP_MROUTE_COMMON
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void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos);
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void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos);
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static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return *pos ? mr_vif_seq_idx(seq_file_net(seq),
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seq->private, *pos - 1)
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: SEQ_START_TOKEN;
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}
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/* These actually return 'struct mr_mfc *', but to avoid need for explicit
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* castings they simply return void.
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*/
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void *mr_mfc_seq_idx(struct net *net,
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struct mr_mfc_iter *it, loff_t pos);
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void *mr_mfc_seq_next(struct seq_file *seq, void *v,
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loff_t *pos);
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static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
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struct mr_table *mrt, spinlock_t *lock)
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{
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struct mr_mfc_iter *it = seq->private;
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it->mrt = mrt;
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it->cache = NULL;
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it->lock = lock;
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return *pos ? mr_mfc_seq_idx(seq_file_net(seq),
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seq->private, *pos - 1)
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: SEQ_START_TOKEN;
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}
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static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
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{
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struct mr_mfc_iter *it = seq->private;
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struct mr_table *mrt = it->mrt;
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if (it->cache == &mrt->mfc_unres_queue)
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spin_unlock_bh(it->lock);
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else if (it->cache == &mrt->mfc_cache_list)
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rcu_read_unlock();
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}
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#else
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static inline void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter,
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loff_t pos)
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{
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return NULL;
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}
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static inline void *mr_vif_seq_next(struct seq_file *seq,
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void *v, loff_t *pos)
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{
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return NULL;
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}
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static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return NULL;
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}
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static inline void *mr_mfc_seq_idx(struct net *net,
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struct mr_mfc_iter *it, loff_t pos)
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{
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return NULL;
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}
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static inline void *mr_mfc_seq_next(struct seq_file *seq, void *v,
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loff_t *pos)
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{
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return NULL;
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}
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static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
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struct mr_table *mrt, spinlock_t *lock)
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{
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return NULL;
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}
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static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
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{
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}
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#endif
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#endif
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#endif
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