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![Nikolay Aleksandrov](/assets/img/avatar_default.png)
This patch adds support for IGMPMSG_WRVIFWHOLE which is used to pass full packet and real vif id when the incoming interface is wrong. While the RP and FHR are setting up state we need to be sending the registers encapsulated with all the data inside otherwise we lose it. The RP then decapsulates it and forwards it to the interested parties. Currently with WRONGVIF we can only be sending empty register packets and will lose that data. This behaviour can be enabled by using MRT_PIM with val == IGMPMSG_WRVIFWHOLE. This doesn't prevent IGMPMSG_WRONGVIF from happening, it happens in addition to it, also it is controlled by the same throttling parameters as WRONGVIF (i.e. 1 packet per 3 seconds currently). Both messages are generated to keep backwards compatibily and avoid breaking someone who was enabling MRT_PIM with val == 4, since any positive val is accepted and treated the same. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> 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-types.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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bool mroute_do_wrvifwhole;
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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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