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2019-02-08mpls_iptunnel: use struct_size() helperGustavo A. R. Silva
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; instance = alloc(sizeof(struct foo) + count * sizeof(struct boo)); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = alloc(struct_size(instance, entry, count)); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-01-19net: mpls: netconf: perform strict checks also for doit handlersJakub Kicinski
Make RTM_GETNETCONF's doit handler use strict checks when NETLINK_F_STRICT_CHK is set. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-01-19net: mpls: route: perform strict checks also for doit handlersJakub Kicinski
Make RTM_GETROUTE's doit handler use strict checks when NETLINK_F_STRICT_CHK is set. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-16net/mpls: Handle kernel side filtering of route dumpsDavid Ahern
Update the dump request parsing in MPLS for the non-INET case to enable kernel side filtering. If INET is disabled the only filters that make sense for MPLS are protocol and nexthop device. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-16net: Enable kernel side filtering of route dumpsDavid Ahern
Update parsing of route dump request to enable kernel side filtering. Allow filtering results by protocol (e.g., which routing daemon installed the route), route type (e.g., unicast), table id and nexthop device. These amount to the low hanging fruit, yet a huge improvement, for dumping routes. ip_valid_fib_dump_req is called with RTNL held, so __dev_get_by_index can be used to look up the device index without taking a reference. From there filter->dev is only used during dump loops with the lock still held. Set NLM_F_DUMP_FILTERED in the answer_flags so the user knows the results have been filtered should no entries be returned. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-16net/mpls: Plumb support for filtering route dumpsDavid Ahern
Implement kernel side filtering of routes by egress device index and protocol. MPLS uses only a single table and route type. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-16net: Add struct for fib dump filterDavid Ahern
Add struct fib_dump_filter for options on limiting which routes are returned in a dump request. The current list is table id, protocol, route type, rtm_flags and nexthop device index. struct net is needed to lookup the net_device from the index. Declare the filter for each route dump handler and plumb the new arguments from dump handlers to ip_valid_fib_dump_req. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-10net/mpls: Implement handler for strict data checking on dumpsDavid Ahern
Without CONFIG_INET enabled compiles fail with: net/mpls/af_mpls.o: In function `mpls_dump_routes': af_mpls.c:(.text+0xed0): undefined reference to `ip_valid_fib_dump_req' The preference is for MPLS to use the same handler as ipv4 and ipv6 to allow consistency when doing a dump for AF_UNSPEC which walks all address families invoking the route dump handler. If INET is disabled then fallback to an MPLS version which can be tighter on the data checks. Fixes: e8ba330ac0c5 ("rtnetlink: Update fib dumps for strict data checking") Reported-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-08net: Update netconf dump handlers for strict data checkingDavid Ahern
Update inet_netconf_dump_devconf, inet6_netconf_dump_devconf, and mpls_netconf_dump_devconf for strict data checking. If the flag is set, the dump request is expected to have an netconfmsg struct as the header. The struct only has the family member and no attributes can be appended. Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Christian Brauner <christian@brauner.io> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-08rtnetlink: Update fib dumps for strict data checkingDavid Ahern
Add helper to check netlink message for route dumps. If the strict flag is set the dump request is expected to have an rtmsg struct as the header. All elements of the struct are expected to be 0 with the exception of rtm_flags (which is used by both ipv4 and ipv6 dumps) and no attributes can be appended. rtm_flags can only have RTM_F_CLONED and RTM_F_PREFIX set. Update inet_dump_fib, inet6_dump_fib, mpls_dump_routes, ipmr_rtm_dumproute, and ip6mr_rtm_dumproute to call this helper if strict data checking is enabled. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-08net: Add extack to nlmsg_parseDavid Ahern
Make sure extack is passed to nlmsg_parse where easy to do so. Most of these are dump handlers and leveraging the extack in the netlink_callback. Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Christian Brauner <christian@brauner.io> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-24mpls: allow routes on ip6gre devicesSaif Hasan
Summary: This appears to be necessary and sufficient change to enable `MPLS` on `ip6gre` tunnels (RFC4023). This diff allows IP6GRE devices to be recognized by MPLS kernel module and hence user can configure interface to accept packets with mpls headers as well setup mpls routes on them. Test Plan: Test plan consists of multiple containers connected via GRE-V6 tunnel. Then carrying out testing steps as below. - Carry out necessary sysctl settings on all containers ``` sysctl -w net.mpls.platform_labels=65536 sysctl -w net.mpls.ip_ttl_propagate=1 sysctl -w net.mpls.conf.lo.input=1 ``` - Establish IP6GRE tunnels ``` ip -6 tunnel add name if_1_2_1 mode ip6gre \ local 2401:db00:21:6048:feed:0::1 \ remote 2401:db00:21:6048:feed:0::2 key 1 ip link set dev if_1_2_1 up sysctl -w net.mpls.conf.if_1_2_1.input=1 ip -4 addr add 169.254.0.2/31 dev if_1_2_1 scope link ip -6 tunnel add name if_1_3_1 mode ip6gre \ local 2401:db00:21:6048:feed:0::1 \ remote 2401:db00:21:6048:feed:0::3 key 1 ip link set dev if_1_3_1 up sysctl -w net.mpls.conf.if_1_3_1.input=1 ip -4 addr add 169.254.0.4/31 dev if_1_3_1 scope link ``` - Install MPLS encap rules on node-1 towards node-2 ``` ip route add 192.168.0.11/32 nexthop encap mpls 32/64 \ via inet 169.254.0.3 dev if_1_2_1 ``` - Install MPLS forwarding rules on node-2 and node-3 ``` // node2 ip -f mpls route add 32 via inet 169.254.0.7 dev if_2_4_1 // node3 ip -f mpls route add 64 via inet 169.254.0.12 dev if_4_3_1 ``` - Ping 192.168.0.11 (node4) from 192.168.0.1 (node1) (where routing towards 192.168.0.1 is via IP route directly towards node1 from node4) ``` ping 192.168.0.11 ``` - tcpdump on interface to capture ping packets wrapped within MPLS header which inturn wrapped within IP6GRE header ``` 16:43:41.121073 IP6 2401:db00:21:6048:feed::1 > 2401:db00:21:6048:feed::2: DSTOPT GREv0, key=0x1, length 100: MPLS (label 32, exp 0, ttl 255) (label 64, exp 0, [S], ttl 255) IP 192.168.0.1 > 192.168.0.11: ICMP echo request, id 1208, seq 45, length 64 0x0000: 6000 2cdb 006c 3c3f 2401 db00 0021 6048 `.,..l<?$....!`H 0x0010: feed 0000 0000 0001 2401 db00 0021 6048 ........$....!`H 0x0020: feed 0000 0000 0002 2f00 0401 0401 0100 ......../....... 0x0030: 2000 8847 0000 0001 0002 00ff 0004 01ff ...G............ 0x0040: 4500 0054 3280 4000 ff01 c7cb c0a8 0001 E..T2.@......... 0x0050: c0a8 000b 0800 a8d7 04b8 002d 2d3c a05b ...........--<.[ 0x0060: 0000 0000 bcd8 0100 0000 0000 1011 1213 ................ 0x0070: 1415 1617 1819 1a1b 1c1d 1e1f 2021 2223 .............!"# 0x0080: 2425 2627 2829 2a2b 2c2d 2e2f 3031 3233 $%&'()*+,-./0123 0x0090: 3435 3637 4567 ``` Signed-off-by: Saif Hasan <has@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-24mpls: remove trailing whitepaceStephen Hemminger
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-04net: rename skb_gso_validate_mtu -> skb_gso_validate_network_lenDaniel Axtens
If you take a GSO skb, and split it into packets, will the network length (L3 headers + L4 headers + payload) of those packets be small enough to fit within a given MTU? skb_gso_validate_mtu gives you the answer to that question. However, we recently added to add a way to validate the MAC length of a split GSO skb (L2+L3+L4+payload), and the names get confusing, so rename skb_gso_validate_mtu to skb_gso_validate_network_len Signed-off-by: Daniel Axtens <dja@axtens.net> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-08mpls, nospec: Sanitize array index in mpls_label_ok()Dan Williams
mpls_label_ok() validates that the 'platform_label' array index from a userspace netlink message payload is valid. Under speculation the mpls_label_ok() result may not resolve in the CPU pipeline until after the index is used to access an array element. Sanitize the index to zero to prevent userspace-controlled arbitrary out-of-bounds speculation, a precursor for a speculative execution side channel vulnerability. Cc: <stable@vger.kernel.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-04net: use rtnl_register_module where neededFlorian Westphal
all of these can be compiled as a module, so use new _module version to make sure module can no longer be removed while callback/dump is in use. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Files removed in 'net-next' had their license header updated in 'net'. We take the remove from 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-02License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseGreg Kroah-Hartman
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-10-12ip_tunnel: fix building with NET_IP_TUNNEL=mArnd Bergmann
When af_mpls is built-in but the tunnel support is a module, we get a link failure: net/mpls/af_mpls.o: In function `mpls_init': af_mpls.c:(.init.text+0xdc): undefined reference to `ip_tunnel_encap_add_ops' This adds a Kconfig statement to prevent the broken configuration and force mpls to be a module as well in this case. Fixes: bdc476413dcd ("ip_tunnel: add mpls over gre support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Amine Kherbouche <amine.kherbouche@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-11net: mpls: make function ipgre_mpls_encap_hlen staticColin Ian King
The function ipgre_mpls_encap_hlen is local to the source and does not need to be in global scope, so make it static. Cleans up sparse warning: symbol 'ipgre_mpls_encap_hlen' was not declared. Should it be static? Fixes: bdc476413dcdb ("ip_tunnel: add mpls over gre support") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-07ip_tunnel: add mpls over gre supportAmine Kherbouche
This commit introduces the MPLSoGRE support (RFC 4023), using ip tunnel API by simply adding ipgre_tunnel_encap_(add|del)_mpls_ops() and the new tunnel type TUNNEL_ENCAP_MPLS. Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-09rtnetlink: make rtnl_register accept a flags parameterFlorian Westphal
This change allows us to later indicate to rtnetlink core that certain doit functions should be called without acquiring rtnl_mutex. This change should have no effect, we simply replace the last (now unused) calcit argument with the new flag. Signed-off-by: Florian Westphal <fw@strlen.de> Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-08mpls: fix uninitialized in_label var warning in mpls_getrouteRoopa Prabhu
Fix the below warning generated by static checker: net/mpls/af_mpls.c:2111 mpls_getroute() error: uninitialized symbol 'in_label'." Fixes: 397fc9e5cefe ("mpls: route get support") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-05mpls: fix rtm policy in mpls_getrouteRoopa Prabhu
fix rtm policy name typo in mpls_getroute and also remove export of rtm_ipv4_policy Fixes: 397fc9e5cefe ("mpls: route get support") Reported-by: David S. Miller <davem@davemloft.net> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-04mpls: route get supportRoopa Prabhu
This patch adds RTM_GETROUTE doit handler for mpls routes. Input: RTA_DST - input label RTA_NEWDST - labels in packet for multipath selection By default the getroute handler returns matched nexthop label, via and oif With RTM_F_FIB_MATCH flag, full matched route is returned. example (with patched iproute2): $ip -f mpls route show 101 nexthop as to 102/103 via inet 172.16.2.2 dev virt1-2 nexthop as to 302/303 via inet 172.16.12.2 dev virt1-12 201 nexthop as to 202/203 via inet6 2001:db8:2::2 dev virt1-2 nexthop as to 402/403 via inet6 2001:db8:12::2 dev virt1-12 $ip -f mpls route get 103 RTNETLINK answers: Network is unreachable $ip -f mpls route get 101 101 as to 102/103 via inet 172.16.2.2 dev virt1-2 $ip -f mpls route get as to 302/303 101 101 as to 302/303 via inet 172.16.12.2 dev virt1-12 $ip -f mpls route get fibmatch 103 RTNETLINK answers: Network is unreachable $ip -f mpls route get fibmatch 101 101 nexthop as to 102/103 via inet 172.16.2.2 dev virt1-2 nexthop as to 302/303 via inet 172.16.12.2 dev virt1-12 Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Just some simple overlapping changes in marvell PHY driver and the DSA core code. Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-31mpls: fix clearing of dead nh_flags on link upRoopa Prabhu
recent fixes to use WRITE_ONCE for nh_flags on link up, accidently ended up leaving the deadflags on a nh. This patch fixes the WRITE_ONCE to use freshly evaluated nh_flags. Fixes: 39eb8cd17588 ("net: mpls: rt_nhn_alive and nh_flags should be accessed using READ_ONCE") Reported-by: Satish Ashok <sashok@cumulusnetworks.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: mpls: remove unnecessary initialization of errDavid Ahern
err is initialized to EINVAL and not used before it is set again. Remove the unnecessary initialization. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: mpls: Make nla_get_via in af_mpls.cDavid Ahern
nla_get_via is only used in af_mpls.c. Remove declaration from internal.h and move up in af_mpls.c before first use. Code move only; no functional change intended. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: mpls: Add extack messages for route add and delete failuresDavid Ahern
Add error messages for failures in adding and deleting mpls routes. This covers most of the annoying EINVAL errors. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: mpls: Pull common label check into helperDavid Ahern
mpls_route_add and mpls_route_del have the same checks on the label. Move to a helper. Avoid duplicate extack messages in the next patch. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: Fill in extack for mpls lwt encapDavid Ahern
Fill in extack for errors in build_state for mpls lwt encap including passing extack to nla_get_labels and adding error messages for failures in it. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: add extack arg to lwtunnel build stateDavid Ahern
Pass extack arg down to lwtunnel_build_state and the build_state callbacks. Add messages for failures in lwtunnel_build_state, and add the extarg to nla_parse where possible in the build_state callbacks. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-08treewide: use kv[mz]alloc* rather than opencoded variantsMichal Hocko
There are many code paths opencoding kvmalloc. Let's use the helper instead. The main difference to kvmalloc is that those users are usually not considering all the aspects of the memory allocator. E.g. allocation requests <= 32kB (with 4kB pages) are basically never failing and invoke OOM killer to satisfy the allocation. This sounds too disruptive for something that has a reasonable fallback - the vmalloc. On the other hand those requests might fallback to vmalloc even when the memory allocator would succeed after several more reclaim/compaction attempts previously. There is no guarantee something like that happens though. This patch converts many of those places to kv[mz]alloc* helpers because they are more conservative. Link: http://lkml.kernel.org/r/20170306103327.2766-2-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> # Xen bits Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Andreas Dilger <andreas.dilger@intel.com> # Lustre Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> # KVM/s390 Acked-by: Dan Williams <dan.j.williams@intel.com> # nvdim Acked-by: David Sterba <dsterba@suse.com> # btrfs Acked-by: Ilya Dryomov <idryomov@gmail.com> # Ceph Acked-by: Tariq Toukan <tariqt@mellanox.com> # mlx4 Acked-by: Leon Romanovsky <leonro@mellanox.com> # mlx5 Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Anton Vorontsov <anton@enomsg.org> Cc: Colin Cross <ccross@android.com> Cc: Tony Luck <tony.luck@intel.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Kent Overstreet <kent.overstreet@gmail.com> Cc: Santosh Raspatur <santosh@chelsio.com> Cc: Hariprasad S <hariprasad@chelsio.com> Cc: Yishai Hadas <yishaih@mellanox.com> Cc: Oleg Drokin <oleg.drokin@intel.com> Cc: "Yan, Zheng" <zyan@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-04-17net: rtnetlink: plumb extended ack to doit functionDavid Ahern
Add netlink_ext_ack arg to rtnl_doit_func. Pass extack arg to nlmsg_parse for doit functions that call it directly. This is the first step to using extended error reporting in rtnetlink. >From here individual subsystems can be updated to set netlink_ext_ack as needed. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-13netlink: pass extended ACK struct to parsing functionsJohannes Berg
Pass the new extended ACK reporting struct to all of the generic netlink parsing functions. For now, pass NULL in almost all callers (except for some in the core.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: Increase max number of labels for lwt encapDavid Ahern
Alow users to push down more labels per MPLS encap. Similar to LSR case, move label array to the end of mpls_iptunnel_encap and allocate based on the number of labels for the route. For consistency with the LSR case, re-use the same maximum number of labels. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: bump maximum number of labelsDavid Ahern
Allow users to push down more labels per MPLS route. With the previous patches, no memory allocations are based on MAX_NEW_LABELS; the limit is only used to keep userspace in check. At this point MAX_NEW_LABELS is only used for mpls_route_config (copying route data from userspace) and processing nexthops looking for the max number of labels across the route spec. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: Limit memory allocation for mpls_routeDavid Ahern
Limit memory allocation size for mpls_route to 4096. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: change mpls_route layoutDavid Ahern
Move labels to the end of mpls_nh as a 0-sized array and within mpls_route move the via for a nexthop after the mpls_nh. The new layout becomes: +----------------------+ | mpls_route | +----------------------+ | mpls_nh 0 | +----------------------+ | alignment padding | 4 bytes for odd number of labels; 0 for even +----------------------+ | via[rt_max_alen] 0 | +----------------------+ | alignment padding | via's aligned on sizeof(unsigned long) +----------------------+ | ... | +----------------------+ | mpls_nh n-1 | +----------------------+ | via[rt_max_alen] n-1 | +----------------------+ Memory allocated for nexthop + via is constant across all nexthops and their via. It is based on the maximum number of labels across all nexthops and the maximum via length. The size is saved in the mpls_route as rt_nh_size. Accessing a nexthop becomes rt->rt_nh + index * rt->rt_nh_size. The offset of the via address from a nexthop is saved as rt_via_offset so that given an mpls_nh pointer the via for that hop is simply nh + rt->rt_via_offset. With prior code, memory allocated per mpls_route with 1 nexthop: via is an ethernet address - 64 bytes via is an ipv4 address - 64 via is an ipv6 address - 72 With this patch set, memory allocated per mpls_route with 1 nexthop and 1 or 2 labels: via is an ethernet address - 56 bytes via is an ipv4 address - 56 via is an ipv6 address - 64 The 8-byte reduction is due to the previous patch; the change introduced by this patch has no impact on the size of allocations for 1 or 2 labels. Performance impact of this change was examined using network namespaces with veth pairs connecting namespaces. ns0 inserts the packet to the label-switched path using an lwt route with encap mpls. ns1 adds 1 or 2 labels depending on test, ns2 (and ns3 for 2-label test) pops the label and forwards. ns3 (or ns4) for a 2-label is the destination. Similar series of namespaces used for 2-nexthop test. Intent is to measure changes to latency (overhead in manipulating the packet) in the forwarding path. Tests used netperf with UDP_RR. IPv4: current patches 1 label, 1 nexthop 29908 30115 2 label, 1 nexthop 29071 29612 1 label, 2 nexthop 29582 29776 2 label, 2 nexthop 29086 29149 IPv6: current patches 1 label, 1 nexthop 24502 24960 2 label, 1 nexthop 24041 24407 1 label, 2 nexthop 23795 23899 2 label, 2 nexthop 23074 22959 In short, the change has no effect to a modest increase in performance. This is expected since this patch does not really have an impact on routes with 1 or 2 labels (the current limit) and 1 or 2 nexthops. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: Convert number of nexthops to u8David Ahern
Number of nexthops and number of alive nexthops are tracked using an unsigned int. A route should never have more than 255 nexthops so convert both to u8. Update all references and intermediate variables to consistently use u8 as well. Shrinks the size of mpls_route from 32 bytes to 24 bytes with a 2-byte hole before the nexthops. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-01net: mpls: rt_nhn_alive and nh_flags should be accessed using READ_ONCEDavid Ahern
The number of alive nexthops for a route (rt->rt_nhn_alive) and the flags for a next hop (nh->nh_flags) are modified by netdev event handlers. The event handlers run with rtnl_lock held so updates are always done with the lock held. The packet path accesses the fields under the rcu lock. Since those fields can change at any moment in the packet path, both fields should be accessed using READ_ONCE. Updates to both fields should use WRITE_ONCE. Update mpls_select_multipath (packet path) and mpls_ifdown and mpls_ifup (event handlers) accordingly. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-29net: mpls: Update lfib_nlmsg_size to skip deleted nexthopsDavid Ahern
A recent commit skips nexthops in a route if the device has been deleted. Update lfib_nlmsg_size accordingly. Reported-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-28net: mpls: Send netconf messages on device register and unregisterDavid Ahern
Send netconf notifications for MPLS when the device registers and unregisters. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-28net:mpls: Refactor mpls_netconf_notify_devconf to take eventDavid Ahern
Refactor mpls_netconf_notify_devconf to take the event as an input arg. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-27net: mpls: Delete route when all nexthops have been deletedDavid Ahern
When all devices for all nexthops in a route have been deleted, the route is effectively dead, so remove it. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-27net: mpls: Don't show nexthop if device has been deletedDavid Ahern
If the device for a nexthop in a multipath route is deleted, the nexthop is effectively removed from the route. Currently, a route dump still returns the nexhop though without the device set: $ ip -f mpls ro ls 100 nexthopvia inet 10.11.1.2 dev br0 nexthopvia inet 10.100.3.1 dev eth3 $ ip li del br0 $ ip -f mpls ro ls 100 nexthopvia inet 10.11.1.2 dev * dead linkdown nexthopvia inet 10.100.3.1 dev eth3 Since the nexthop is effectively deleted, drop the hop from the route dump. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-24net: mpls: Fix setting ttl_propagate for rt2David Ahern
Fix copy and paste error setting rt_ttl_propagate. Fixes: 5b441ac8784c1 ("mpls: allow TTL propagation to IP packets to be configured") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: drivers/net/ethernet/broadcom/genet/bcmmii.c drivers/net/hyperv/netvsc.c kernel/bpf/hashtab.c Almost entirely overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-16net: mpls: Fix nexthop alive tracking on down eventsDavid Ahern
Alive tracking of nexthops can account for a link twice if the carrier goes down followed by an admin down of the same link rendering multipath routes useless. This is similar to 79099aab38c8 for UNREGISTER events and DOWN events. Fix by tracking number of alive nexthops in mpls_ifdown similar to the logic in mpls_ifup. Checking the flags per nexthop once after all events have been processed is simpler than trying to maintian a running count through all event combinations. Also, WRITE_ONCE is used instead of ACCESS_ONCE to set rt_nhn_alive per a comment from checkpatch: WARNING: Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR> Fixes: c89359a42e2a4 ("mpls: support for dead routes") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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