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2013-02-06xfrm: make gc_thresh configurable in all namespacesMichal Kubecek
The xfrm gc threshold can be configured via xfrm{4,6}_gc_thresh sysctl but currently only in init_net, other namespaces always use the default value. This can substantially limit the number of IPsec tunnels that can be effectively used. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2013-01-17netfilter: add connlabel conntrack extensionFlorian Westphal
similar to connmarks, except labels are bit-based; i.e. all labels may be attached to a flow at the same time. Up to 128 labels are supported. Supporting more labels is possible, but requires increasing the ct offset delta from u8 to u16 type due to increased extension sizes. Mapping of bit-identifier to label name is done in userspace. The extension is enabled at run-time once "-m connlabel" netfilter rules are added. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2013-01-15Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: Documentation/networking/ip-sysctl.txt drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c Both conflicts were simply overlapping context. A build fix for qlcnic is in here too, simply removing the added devinit annotations which no longer exist. Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-07tcp: make sysctl_tcp_ecn namespace awareHannes Frederic Sowa
As per suggestion from Eric Dumazet this patch makes tcp_ecn sysctl namespace aware. The reason behind this patch is to ease the testing of ecn problems on the internet and allows applications to tune their own use of ecn. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David Miller <davem@davemloft.net> Cc: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-24netfilter: xt_CT: recover NOTRACK target supportPablo Neira Ayuso
Florian Westphal reported that the removal of the NOTRACK target (9655050 netfilter: remove xt_NOTRACK) is breaking some existing setups. That removal was scheduled for removal since long time ago as described in Documentation/feature-removal-schedule.txt What: xt_NOTRACK Files: net/netfilter/xt_NOTRACK.c When: April 2011 Why: Superseded by xt_CT Still, people may have not notice / may have decided to stick to an old iptables version. I agree with him in that some more conservative approach by spotting some printk to warn users for some time is less agressive. Current iptables 1.4.16.3 already contains the aliasing support that makes it point to the CT target, so upgrading would fix it. Still, the policy so far has been to avoid pushing our users to upgrade. As a solution, this patch recovers the NOTRACK target inside the CT target and it now spots a warning. Reported-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-12-16netfilter: xt_CT: fix crash while destroy ct templatesPablo Neira Ayuso
In (d871bef netfilter: ctnetlink: dump entries from the dying and unconfirmed lists), we assume that all conntrack objects are inserted in any of the existing lists. However, template conntrack objects were not. This results in hitting BUG_ON in the destroy_conntrack path while removing a rule that uses the CT target. This patch fixes the situation by adding the template lists, which is where template conntrack objects reside now. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-10-26sctp: Make hmac algorithm selection for cookie generation dynamicNeil Horman
Currently sctp allows for the optional use of md5 of sha1 hmac algorithms to generate cookie values when establishing new connections via two build time config options. Theres no real reason to make this a static selection. We can add a sysctl that allows for the dynamic selection of these algorithms at run time, with the default value determined by the corresponding crypto library availability. This comes in handy when, for example running a system in FIPS mode, where use of md5 is disallowed, but SHA1 is permitted. Note: This new sysctl has no corresponding socket option to select the cookie hmac algorithm. I chose not to implement that intentionally, as RFC 6458 contains no option for this value, and I opted not to pollute the socket option namespace. Change notes: v2) * Updated subject to have the proper sctp prefix as per Dave M. * Replaced deafult selection options with new options that allow developers to explicitly select available hmac algs at build time as per suggestion by Vlad Y. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Vlad Yasevich <vyasevich@gmail.com> CC: "David S. Miller" <davem@davemloft.net> CC: netdev@vger.kernel.org Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-28Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: drivers/net/team/team.c drivers/net/usb/qmi_wwan.c net/batman-adv/bat_iv_ogm.c net/ipv4/fib_frontend.c net/ipv4/route.c net/l2tp/l2tp_netlink.c The team, fib_frontend, route, and l2tp_netlink conflicts were simply overlapping changes. qmi_wwan and bat_iv_ogm were of the "use HEAD" variety. With help from Antonio Quartulli. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-19ipv6: add a new namespace for nf_conntrack_reasmAmerigo Wang
As pointed by Michal, it is necessary to add a new namespace for nf_conntrack_reasm code, this prepares for the second patch. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Michal Kubeček <mkubecek@suse.cz> Cc: David Miller <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: netfilter-devel@vger.kernel.org Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-18netns: move net->ipv4.rt_genid to net->rt_genidNicolas Dichtel
This commit prepares the use of rt_genid by both IPv4 and IPv6. Initialization is left in IPv4 part. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextPablo Neira Ayuso
This merges (3f509c6 netfilter: nf_nat_sip: fix incorrect handling of EBUSY for RTCP expectation) to Patrick McHardy's IPv6 NAT changes.
2012-08-30netfilter: ipv6: add IPv6 NAT supportPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net>
2012-08-30netfilter: add protocol independent NAT corePatrick McHardy
Convert the IPv4 NAT implementation to a protocol independent core and address family specific modules. Signed-off-by: Patrick McHardy <kaber@trash.net>
2012-08-24Merge branch 'for-next' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace This is an initial merge in of Eric Biederman's work to start adding user namespace support to the networking. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-23packet: fix broken build.Rami Rosen
This patch fixes a broken build due to a missing header: ... CC net/ipv4/proc.o In file included from include/net/net_namespace.h:15, from net/ipv4/proc.c:35: include/net/netns/packet.h:11: error: field 'sklist_lock' has incomplete type ... The lock of netns_packet has been replaced by a recent patch to be a mutex instead of a spinlock, but we need to replace the header file to be linux/mutex.h instead of linux/spinlock.h as well. See commit 0fa7fa98dbcc2789409ed24e885485e645803d7f: packet: Protect packet sk list with mutex (v2) patch, Signed-off-by: Rami Rosen <rosenr@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-23packet: Protect packet sk list with mutex (v2)Pavel Emelyanov
Change since v1: * Fixed inuse counters access spotted by Eric In patch eea68e2f (packet: Report socket mclist info via diag module) I've introduced a "scheduling in atomic" problem in packet diag module -- the socket list is traversed under rcu_read_lock() while performed under it sk mclist access requires rtnl lock (i.e. -- mutex) to be taken. [152363.820563] BUG: scheduling while atomic: crtools/12517/0x10000002 [152363.820573] 4 locks held by crtools/12517: [152363.820581] #0: (sock_diag_mutex){+.+.+.}, at: [<ffffffff81a2dcb5>] sock_diag_rcv+0x1f/0x3e [152363.820613] #1: (sock_diag_table_mutex){+.+.+.}, at: [<ffffffff81a2de70>] sock_diag_rcv_msg+0xdb/0x11a [152363.820644] #2: (nlk->cb_mutex){+.+.+.}, at: [<ffffffff81a67d01>] netlink_dump+0x23/0x1ab [152363.820693] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff81b6a049>] packet_diag_dump+0x0/0x1af Similar thing was then re-introduced by further packet diag patches (fanount mutex and pgvec mutex for rings) :( Apart from being terribly sorry for the above, I propose to change the packet sk list protection from spinlock to mutex. This lock currently protects two modifications: * sklist * prot inuse counters The sklist modifications can be just reprotected with mutex since they already occur in a sleeping context. The inuse counters modifications are trickier -- the __this_cpu_-s are used inside, thus requiring the caller to handle the potential issues with contexts himself. Since packet sockets' counters are modified in two places only (packet_create and packet_release) we only need to protect the context from being preempted. BH disabling is not required in this case. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Make sysctl tunables per netEric W. Biederman
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Add infrastructure for per net sysctlsEric W. Biederman
Start with an empty sctp_net_table that will be populated as the various tunable sysctls are made per net. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Make the mib per network namespaceEric W. Biederman
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Make the proc files per network namespace.Eric W. Biederman
- Convert all of the files under /proc/net/sctp to be per network namespace. - Don't print anything for /proc/net/sctp/snmp except in the initial network namespaces as the snmp counters still have to be converted to be per network namespace. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Make the ctl_sock per network namespaceEric W. Biederman
- Kill sctp_get_ctl_sock, it is useless now. - Pass struct net where needed so net->sctp.ctl_sock is accessible. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15sctp: Make the address lists per network namespaceEric W. Biederman
- Move the address lists into struct net - Add per network namespace initialization and cleanup - Pass around struct net so it is everywhere I need it. - Rename all of the global variable references into references to the variables moved into struct net Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-15userns: Use kgids for sysctl_ping_group_rangeEric W. Biederman
- Store sysctl_ping_group_range as a paire of kgid_t values instead of a pair of gid_t values. - Move the kgid conversion work from ping_init_sock into ipv4_ping_group_range - For invalid cases reset to the default disabled state. With the kgid_t conversion made part of the original value sanitation from userspace understand how the code will react becomes clearer and it becomes possible to set the sysctl ping group range from something other than the initial user namespace. Cc: Vasiliy Kulikov <segoon@openwall.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-07-30ipv4: remove rt_cache_rebuild_countEric Dumazet
After IP route cache removal, rt_cache_rebuild_count is no longer used. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20tcp: use hash_32() in tcp_metricsEric Dumazet
Fix a missing roundup_pow_of_two(), since tcpmhash_entries is not guaranteed to be a power of two. Uses hash_32() instead of custom hash. tcpmhash_entries should be an unsigned int. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19ipv4: tcp: remove per net tcp_sockEric Dumazet
tcp_v4_send_reset() and tcp_v4_send_ack() use a single socket per network namespace. This leads to bad behavior on multiqueue NICS, because many cpus contend for the socket lock and once socket lock is acquired, extra false sharing on various socket fields slow down the operations. To better resist to attacks, we use a percpu socket. Each cpu can run without contention, using appropriate memory (local node) Additional features : 1) We also mirror the queue_mapping of the incoming skb, so that answers use the same queue if possible. 2) Setting SOCK_USE_WRITE_QUEUE socket flag speedup sock_wfree() 3) We now limit the number of in-flight RST/ACK [1] packets per cpu, instead of per namespace, and we honor the sysctl_wmem_default limit dynamically. (Prior to this patch, sysctl_wmem_default value was copied at boot time, so any further change would not affect tcp_sock limit) [1] These packets are only generated when no socket was matched for the incoming packet. Reported-by: Bill Sommerfeld <wsommerfeld@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-11tcp: Maintain dynamic metrics in local cache.David S. Miller
Maintain a local hash table of TCP dynamic metrics blobs. Computed TCP metrics are no longer maintained in the route metrics. The table uses RCU and an extremely simple hash so that it has low latency and low overhead. A simple hash is legitimate because we only make metrics blobs for fully established connections. Some tweaking of the default hash table sizes, metric timeouts, and the hash chain length limit certainly could use some tweaking. But the basic design seems sound. With help from Eric Dumazet and Joe Perches. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-06ipv4: Avoid overhead when no custom FIB rules are installed.David S. Miller
If the user hasn't actually installed any custom rules, or fiddled with the default ones, don't go through the whole FIB rules layer. It's just pure overhead. Instead do what we do with CONFIG_IP_MULTIPLE_TABLES disabled, check the individual tables by hand, one by one. Also, move fib_num_tclassid_users into the ipv4 network namespace. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-11Merge branch 'master' of git://1984.lsi.us.es/net-nextDavid S. Miller
2012-06-08inetpeer: add namespace support for inetpeerGao feng
now inetpeer doesn't support namespace,the information will be leaking across namespace. this patch move the global vars v4_peers and v6_peers to netns_ipv4 and netns_ipv6 as a field peers. add struct pernet_operations inetpeer_ops to initial pernet inetpeer data. and change family_to_base and inet_getpeer to support namespace. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-07netfilter: nf_ct_icmp: add namespace supportGao feng
This patch adds namespace support for ICMPv6 protocol tracker. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_ct_icmp: add namespace supportGao feng
This patch adds namespace support for ICMP protocol tracker. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_ct_udp: add namespace supportGao feng
This patch adds namespace support for UDP protocol tracker. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_ct_tcp: add namespace supportGao feng
This patch adds namespace support for TCP protocol tracker. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_ct_generic: add namespace supportGao feng
This patch adds namespace support for the generic layer 4 protocol tracker. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_conntrack: prepare namespace support for l3 protocol trackersGao feng
This patch prepares the namespace support for layer 3 protocol trackers. Basically, this modifies the following interfaces: * nf_ct_l3proto_[un]register_sysctl. * nf_conntrack_l3proto_[un]register. We add a new nf_ct_l3proto_net is used to get the pernet data of l3proto. This adds rhe new struct nf_ip_net that is used to store the sysctl header and l3proto_ipv4,l4proto_tcp(6),l4proto_udp(6),l4proto_icmp(v6) because the protos such tcp and tcp6 use the same data,so making nf_ip_net as a field of netns_ct is the easiest way to manager it. This patch also adds init_net to struct nf_conntrack_l3proto to initial the layer 3 protocol pernet data. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-06-07netfilter: nf_conntrack: prepare namespace support for l4 protocol trackersGao feng
This patch prepares the namespace support for layer 4 protocol trackers. Basically, this modifies the following interfaces: * nf_ct_[un]register_sysctl * nf_conntrack_l4proto_[un]register to include the namespace parameter. We still use init_net in this patch to prepare the ground for follow-up patches for each layer 4 protocol tracker. We add a new net_id field to struct nf_conntrack_l4proto that is used to store the pernet_operations id for each layer 4 protocol tracker. Note that AF_INET6's protocols do not need to do sysctl compat. Thus, we only register compat sysctl when l4proto.l3proto != AF_INET6. Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-05-08netfilter: nf_ct_helper: allow to disable automatic helper assignmentEric Leblond
This patch allows you to disable automatic conntrack helper lookup based on TCP/UDP ports, eg. echo 0 > /proc/sys/net/netfilter/nf_conntrack_helper [ Note: flows that already got a helper will keep using it even if automatic helper assignment has been disabled ] Once this behaviour has been disabled, you have to explicitly use the iptables CT target to attach helper to flows. There are good reasons to stop supporting automatic helper assignment, for further information, please read: http://www.netfilter.org/news.html#2012-04-03 This patch also adds one message to inform that automatic helper assignment is deprecated and it will be removed soon (this is spotted only once, with the first flow that gets a helper attached to make it as less annoying as possible). Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-04-21net ipv6: Don't use sysctl tables with .child entries.Eric W. Biederman
The sysctl core no longer natively understands sysctl tables with .child entries. Split the ipv6_table to remove the .child entries. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-15net: cleanup unsigned to unsigned intEric Dumazet
Use of "unsigned int" is preferred to bare "unsigned" in net tree. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-04BUG: headers with BUG/BUG_ON etc. need linux/bug.hPaul Gortmaker
If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any other BUG variant in a static inline (i.e. not in a #define) then that header really should be including <linux/bug.h> and not just expecting it to be implicitly present. We can make this change risk-free, since if the files using these headers didn't have exposure to linux/bug.h already, they would have been causing compile failures/warnings. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-01-28netns: Fail conspicously if someone uses net_generic at an inappropriate time.Eric W. Biederman
By definition net_generic should never be called when it can return NULL. Fail conspicously with a BUG_ON to make it clear when people mess up that a NULL return should never happen. Recently there was a bug in the CAIF subsystem where it was registered with register_pernet_device instead of register_pernet_subsys. It was erroneously concluded that net_generic could validly return NULL and that net_assign_generic was buggy (when it was just inefficient). Hopefully this BUG_ON will prevent people to coming to similar erroneous conclusions in the futrue. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Tested-by: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-13per-netns ipv4 sysctl_tcp_memGlauber Costa
This patch allows each namespace to independently set up its levels for tcp memory pressure thresholds. This patch alone does not buy much: we need to make this values per group of process somehow. This is achieved in the patches that follows in this patchset. Signed-off-by: Glauber Costa <glommer@parallels.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> CC: David S. Miller <davem@davemloft.net> CC: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-11net: use IS_ENABLED(CONFIG_IPV6)Eric Dumazet
Instead of testing defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-02Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2011-11-21netfilter: nf_conntrack: make event callback registration per-netnsPablo Neira Ayuso
This patch fixes an oops that can be triggered following this recipe: 0) make sure nf_conntrack_netlink and nf_conntrack_ipv4 are loaded. 1) container is started. 2) connect to it via lxc-console. 3) generate some traffic with the container to create some conntrack entries in its table. 4) stop the container: you hit one oops because the conntrack table cleanup tries to report the destroy event to user-space but the per-netns nfnetlink socket has already gone (as the nfnetlink socket is per-netns but event callback registration is global). To fix this situation, we make the ctnl_notifier per-netns so the callback is registered/unregistered if the container is created/destroyed. Alex Bligh and Alexey Dobriyan originally proposed one small patch to check if the nfnetlink socket is gone in nfnetlink_has_listeners, but this is a very visited path for events, thus, it may reduce performance and it looks a bit hackish to check for the nfnetlink socket only to workaround this situation. As a result, I decided to follow the bigger path choice, which seems to look nicer to me. Cc: Alexey Dobriyan <adobriyan@gmail.com> Reported-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-11-14ipv6: reduce percpu needs for icmpv6msg mibsEric Dumazet
Reading /proc/net/snmp6 on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPV6MSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory (32MBytes on non x86 arches) ICMP messages are not considered as fast path on a typical server, and eventually few cpus handle them anyway. We can afford an atomic operation instead of using percpu data. This saves 4096 bytes per cpu and per network namespace. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-11-09ipv4: reduce percpu needs for icmpmsg mibsEric Dumazet
Reading /proc/net/snmp on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory. ICMP messages are not considered as fast path on a typical server, and eventually few cpus handle them anyway. We can afford an atomic operation instead of using percpu data. This saves 4096 bytes per cpu and per network namespace. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-26atomic: use <linux/atomic.h>Arun Sharma
This allows us to move duplicated code in <asm/atomic.h> (atomic_inc_not_zero() for now) to <linux/atomic.h> Signed-off-by: Arun Sharma <asharma@fb.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Miller <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-13net: ipv4: add IPPROTO_ICMP socket kindVasiliy Kulikov
This patch adds IPPROTO_ICMP socket kind. It makes it possible to send ICMP_ECHO messages and receive the corresponding ICMP_ECHOREPLY messages without any special privileges. In other words, the patch makes it possible to implement setuid-less and CAP_NET_RAW-less /bin/ping. In order not to increase the kernel's attack surface, the new functionality is disabled by default, but is enabled at bootup by supporting Linux distributions, optionally with restriction to a group or a group range (see below). Similar functionality is implemented in Mac OS X: http://www.manpagez.com/man/4/icmp/ A new ping socket is created with socket(PF_INET, SOCK_DGRAM, PROT_ICMP) Message identifiers (octets 4-5 of ICMP header) are interpreted as local ports. Addresses are stored in struct sockaddr_in. No port numbers are reserved for privileged processes, port 0 is reserved for API ("let the kernel pick a free number"). There is no notion of remote ports, remote port numbers provided by the user (e.g. in connect()) are ignored. Data sent and received include ICMP headers. This is deliberate to: 1) Avoid the need to transport headers values like sequence numbers by other means. 2) Make it easier to port existing programs using raw sockets. ICMP headers given to send() are checked and sanitized. The type must be ICMP_ECHO and the code must be zero (future extensions might relax this, see below). The id is set to the number (local port) of the socket, the checksum is always recomputed. ICMP reply packets received from the network are demultiplexed according to their id's, and are returned by recv() without any modifications. IP header information and ICMP errors of those packets may be obtained via ancillary data (IP_RECVTTL, IP_RETOPTS, and IP_RECVERR). ICMP source quenches and redirects are reported as fake errors via the error queue (IP_RECVERR); the next hop address for redirects is saved to ee_info (in network order). socket(2) is restricted to the group range specified in "/proc/sys/net/ipv4/ping_group_range". It is "1 0" by default, meaning that nobody (not even root) may create ping sockets. Setting it to "100 100" would grant permissions to the single group (to either make /sbin/ping g+s and owned by this group or to grant permissions to the "netadmins" group), "0 4294967295" would enable it for the world, "100 4294967295" would enable it for the users, but not daemons. The existing code might be (in the unlikely case anyone needs it) extended rather easily to handle other similar pairs of ICMP messages (Timestamp/Reply, Information Request/Reply, Address Mask Request/Reply etc.). Userspace ping util & patch for it: http://openwall.info/wiki/people/segoon/ping For Openwall GNU/*/Linux it was the last step on the road to the setuid-less distro. A revision of this patch (for RHEL5/OpenVZ kernels) is in use in Owl-current, such as in the 2011/03/12 LiveCD ISOs: http://mirrors.kernel.org/openwall/Owl/current/iso/ Initially this functionality was written by Pavel Kankovsky for Linux 2.4.32, but unfortunately it was never made public. All ping options (-b, -p, -Q, -R, -s, -t, -T, -M, -I), are tested with the patch. PATCH v3: - switched to flowi4. - minor changes to be consistent with raw sockets code. PATCH v2: - changed ping_debug() to pr_debug(). - removed CONFIG_IP_PING. - removed ping_seq_fops.owner field (unused for procfs). - switched to proc_net_fops_create(). - switched to %pK in seq_printf(). PATCH v1: - fixed checksumming bug. - CAP_NET_RAW may not create icmp sockets anymore. RFC v2: - minor cleanups. - introduced sysctl'able group range to restrict socket(2). Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: David S. Miller <davem@davemloft.net>