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2010-06-30fragment: add fast path for in-order fragmentsChangli Gao
add fast path for in-order fragments As the fragments are sent in order in most of OSes, such as Windows, Darwin and FreeBSD, it is likely the new fragments are at the end of the inet_frag_queue. In the fast path, we check if the skb at the end of the inet_frag_queue is the prev we expect. Signed-off-by: Changli Gao <xiaosuo@gmail.com> ---- include/net/inet_frag.h | 1 + net/ipv4/ip_fragment.c | 12 ++++++++++++ net/ipv6/reassembly.c | 11 +++++++++++ 3 files changed, 24 insertions(+) Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-27inet fragments: fix sparse warning: context imbalanceHannes Eder
Impact: Attribute function with __releases(...) Fix this sparse warning: net/ipv4/inet_fragment.c:276:35: warning: context imbalance in 'inet_frag_find' - unexpected unlock Signed-off-by: Hannes Eder <hannes@hanneseder.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-28[NET]: Rename inet_frag.h identifiers COMPLETE, FIRST_IN, LAST_IN to INET_FRAG_*Joe Perches
On Fri, 2008-03-28 at 03:24 -0700, Andrew Morton wrote: > they should all be renamed. Done for include/net and net Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the pernet subsystem for fragments.Pavel Emelyanov
On namespace start we mainly prepare the ctl variables. When the namespace is stopped we have to kill all the fragments that point to this namespace. The inet_frags_exit_net() handles it. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the LRU list per namespace.Pavel Emelyanov
The inet_frags.lru_list is used for evicting only, so we have to make it per-namespace, to evict only those fragments, who's namespace exceeded its high threshold, but not the whole hash. Besides, this helps to avoid long loops in evictor. The spinlock is not per-namespace because it protects the hash table as well, which is global. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Isolate the secret interval from namespaces.Pavel Emelyanov
Since we have one hashtable to lookup the fragment, having different secret_interval-s for hash rebuild doesn't make sense, so move this one to inet_frags. The inet_frags_ctl becomes empty after this, so remove it. The appropriate ctl table is kept read-only in namespaces. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make thresholds work in namespaces.Pavel Emelyanov
This is the same as with the timeout variable. Currently, after exceeding the high threshold _all_ the fragments are evicted, but it will be fixed in later patch. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the net.ipv4.ipfrag_timeout work in namespaces.Pavel Emelyanov
Move it to the netns_frags, adjust the usage and make the appropriate ctl table writable. Now fragment, that live in different namespaces can live for different times. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the mem counter per-namespace.Pavel Emelyanov
This is also simple, but introduces more changes, since then mem counter is altered in more places. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the nqueues counter per-namespace.Pavel Emelyanov
This is simple - just move the variable from struct inet_frags to struct netns_frags and adjust the usage appropriately. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NETNS][FRAGS]: Make the inet_frag_queue lookup work in namespaces.Pavel Emelyanov
Since fragment management code is consolidated, we cannot have the pointer from inet_frag_queue to struct net, since we must know what king of fragment this is. So, I introduce the netns_frags structure. This one is currently empty, but will be eventually filled with per-namespace attributes. Each inet_frag_queue is tagged with this one. The conntrack_reasm is not "netns-izated", so it has one static netns_frags instance to keep working in init namespace. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-18[INET]: Remove no longer needed ->equal callbackPavel Emelyanov
Since this callback is used to check for conflicts in hashtable when inserting a newly created frag queue, we can do the same by checking for matching the queue with the argument, used to create one. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-18[INET]: Consolidate xxx_find() in fragment managementPavel Emelyanov
Here we need another callback ->match to check whether the entry found in hash matches the key passed. The key used is the same as the creation argument for inet_frag_create. Yet again, this ->match is the same for netfilter and ipv6. Running a frew steps forward - this callback will later replace the ->equal one. Since the inet_frag_find() uses the already consolidated inet_frag_create() remove the xxx_frag_create from protocol codes. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-18[INET]: Consolidate xxx_frag_create()Pavel Emelyanov
This one uses the xxx_frag_intern() and xxx_frag_alloc() routines, which are already consolidated, so remove them from protocol code (as promised). The ->constructor callback is used to init the rest of the frag queue and it is the same for netfilter and ipv6. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-18[INET]: Consolidate xxx_frag_alloc()Pavel Emelyanov
Just perform the kzalloc() allocation and setup common fields in the inet_frag_queue(). Then return the result to the caller to initialize the rest. The inet_frag_alloc() may return NULL, so check the return value before doing the container_of(). This looks ugly, but the xxx_frag_alloc() will be removed soon. The xxx_expire() timer callbacks are patches, because the argument is now the inet_frag_queue, not the protocol specific queue. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-18[INET]: Consolidate xxx_frag_internPavel Emelyanov
This routine checks for the existence of a given entry in the hash table and inserts the new one if needed. The ->equal callback is used to compare two frag_queue-s together, but this one is temporary and will be removed later. The netfilter code and the ipv6 one use the same routine to compare frags. The inet_frag_intern() always returns non-NULL pointer, so convert the inet_frag_queue into protocol specific one (with the container_of) without any checks. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Consolidate the xxx_putPavel Emelyanov
These ones use the generic data types too, so move them in one place. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Consolidate the xxx_evictorPavel Emelyanov
The evictors collect some statistics for ipv4 and ipv6, so make it return the number of evicted queues and account them all at once in the caller. The XXX_ADD_STATS_BH() macros are just for this case, but maybe there are places in code, that can make use of them as well. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Consolidate the xxx_frag_destroyPavel Emelyanov
To make in possible we need to know the exact frag queue size for inet_frags->mem management and two callbacks: * to destoy the skb (optional, used in conntracks only) * to free the queue itself (mandatory, but later I plan to move the allocation and the destruction of frag_queues into the common place, so this callback will most likely be optional too). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Consolidate xxx_the secret_rebuildPavel Emelyanov
This code works with the generic data types as well, so move this into inet_fragment.c This move makes it possible to hide the secret_timer management and the secret_rebuild routine completely in the inet_fragment.c Introduce the ->hashfn() callback in inet_frags() to get the hashfun for a given inet_frag_queue() object. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Consolidate the xxx_frag_killPavel Emelyanov
Since now all the xxx_frag_kill functions now work with the generic inet_frag_queue data type, this can be moved into a common place. The xxx_unlink() code is moved as well. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Collect common frag sysctl variables togetherPavel Emelyanov
Some sysctl variables are used to tune the frag queues management and it will be useful to work with them in a common way in the future, so move them into one structure, moreover they are the same for all the frag management codes. I don't place them in the existing inet_frags object, introduced in the previous patch for two reasons: 1. to keep them in the __read_mostly section; 2. not to export the whole inet_frags objects outside. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Collect frag queues management objects togetherPavel Emelyanov
There are some objects that are common in all the places which are used to keep track of frag queues, they are: * hash table * LRU list * rw lock * rnd number for hash function * the number of queues * the amount of memory occupied by queues * secret timer Move all this stuff into one structure (struct inet_frags) to make it possible use them uniformly in the future. Like with the previous patch this mostly consists of hunks like - write_lock(&ipfrag_lock); + write_lock(&ip4_frags.lock); To address the issue with exporting the number of queues and the amount of memory occupied by queues outside the .c file they are declared in, I introduce a couple of helpers. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-15[INET]: Move common fields from frag_queues in one place.Pavel Emelyanov
Introduce the struct inet_frag_queue in include/net/inet_frag.h file and place there all the common fields from three structs: * struct ipq in ipv4/ip_fragment.c * struct nf_ct_frag6_queue in nf_conntrack_reasm.c * struct frag_queue in ipv6/reassembly.c After this, replace these fields on appropriate structures with this structure instance and fix the users to use correct names i.e. hunks like - atomic_dec(&fq->refcnt); + atomic_dec(&fq->q.refcnt); (these occupy most of the patch) Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>