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2017-08-25ipv6: sr: add support for encapsulation of L2 framesDavid Lebrun1-2/+23
This patch implements the L2 frame encapsulation mechanism, referred to as T.Encaps.L2 in the SRv6 specifications [1]. A new type of SRv6 tunnel mode is added (SEG6_IPTUN_MODE_L2ENCAP). It only accepts packets with an existing MAC header (i.e., it will not work for locally generated packets). The resulting packet looks like IPv6 -> SRH -> Ethernet -> original L3 payload. The next header field of the SRH is set to NEXTHDR_NONE. [1] https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-01 Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-25ipv6: sr: add support for ip4ip6 encapsulationDavid Lebrun1-10/+37
This patch enables the SRv6 encapsulation mode to carry an IPv4 payload. All the infrastructure was already present, I just had to add a parameter to seg6_do_srh_encap() to specify the inner packet protocol, and perform some additional checks. Usage example: ip route add 1.2.3.4 encap seg6 mode encap segs fc00::1,fc00::2 dev eth0 Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-07ipv6: sr: export SRH insertion functionsDavid Lebrun1-8/+4
This patch exports the seg6_do_srh_encap() and seg6_do_srh_inline() functions. It also removes the CONFIG_IPV6_SEG6_INLINE knob that enabled the compilation of seg6_do_srh_inline(). This function is now built-in. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-30net: add extack arg to lwtunnel build stateDavid Ahern1-2/+3
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>
2017-04-17ipv6: sr: fix BUG due to headroom too small after SRH pushDavid Lebrun1-0/+8
When a locally generated packet receives an SRH with two or more segments, the remaining headroom is too small to push an ethernet header. This patch ensures that the headroom is large enough after SRH push. The BUG generated the following trace. [ 192.950285] skbuff: skb_under_panic: text:ffffffff81809675 len:198 put:14 head:ffff88006f306400 data:ffff88006f3063fa tail:0xc0 end:0x2c0 dev:A-1 [ 192.952456] ------------[ cut here ]------------ [ 192.953218] kernel BUG at net/core/skbuff.c:105! [ 192.953411] invalid opcode: 0000 [#1] PREEMPT SMP [ 192.953411] Modules linked in: [ 192.953411] CPU: 5 PID: 3433 Comm: ping6 Not tainted 4.11.0-rc3+ #237 [ 192.953411] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014 [ 192.953411] task: ffff88007c2d42c0 task.stack: ffffc90000ef4000 [ 192.953411] RIP: 0010:skb_panic+0x61/0x70 [ 192.953411] RSP: 0018:ffffc90000ef7900 EFLAGS: 00010286 [ 192.953411] RAX: 0000000000000085 RBX: 00000000000086dd RCX: 0000000000000201 [ 192.953411] RDX: 0000000080000201 RSI: ffffffff81d104c5 RDI: 00000000ffffffff [ 192.953411] RBP: ffffc90000ef7920 R08: 0000000000000001 R09: 0000000000000000 [ 192.953411] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 192.953411] R13: ffff88007c5a4000 R14: ffff88007b363d80 R15: 00000000000000b8 [ 192.953411] FS: 00007f94b558b700(0000) GS:ffff88007fd40000(0000) knlGS:0000000000000000 [ 192.953411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 192.953411] CR2: 00007fff5ecd5080 CR3: 0000000074141000 CR4: 00000000001406e0 [ 192.953411] Call Trace: [ 192.953411] skb_push+0x3b/0x40 [ 192.953411] eth_header+0x25/0xc0 [ 192.953411] neigh_resolve_output+0x168/0x230 [ 192.953411] ? ip6_finish_output2+0x242/0x8f0 [ 192.953411] ip6_finish_output2+0x242/0x8f0 [ 192.953411] ? ip6_finish_output2+0x76/0x8f0 [ 192.953411] ip6_finish_output+0xa8/0x1d0 [ 192.953411] ip6_output+0x64/0x2d0 [ 192.953411] ? ip6_output+0x73/0x2d0 [ 192.953411] ? ip6_dst_check+0xb5/0xc0 [ 192.953411] ? dst_cache_per_cpu_get.isra.2+0x40/0x80 [ 192.953411] seg6_output+0xb0/0x220 [ 192.953411] lwtunnel_output+0xcf/0x210 [ 192.953411] ? lwtunnel_output+0x59/0x210 [ 192.953411] ip6_local_out+0x38/0x70 [ 192.953411] ip6_send_skb+0x2a/0xb0 [ 192.953411] ip6_push_pending_frames+0x48/0x50 [ 192.953411] rawv6_sendmsg+0xa39/0xf10 [ 192.953411] ? __lock_acquire+0x489/0x890 [ 192.953411] ? __mutex_lock+0x1fc/0x970 [ 192.953411] ? __lock_acquire+0x489/0x890 [ 192.953411] ? __mutex_lock+0x1fc/0x970 [ 192.953411] ? tty_ioctl+0x283/0xec0 [ 192.953411] inet_sendmsg+0x45/0x1d0 [ 192.953411] ? _copy_from_user+0x54/0x80 [ 192.953411] sock_sendmsg+0x33/0x40 [ 192.953411] SYSC_sendto+0xef/0x170 [ 192.953411] ? entry_SYSCALL_64_fastpath+0x5/0xc2 [ 192.953411] ? trace_hardirqs_on_caller+0x12b/0x1b0 [ 192.953411] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 192.953411] SyS_sendto+0x9/0x10 [ 192.953411] entry_SYSCALL_64_fastpath+0x1f/0xc2 [ 192.953411] RIP: 0033:0x7f94b453db33 [ 192.953411] RSP: 002b:00007fff5ecd0578 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 192.953411] RAX: ffffffffffffffda RBX: 00007fff5ecd16e0 RCX: 00007f94b453db33 [ 192.953411] RDX: 0000000000000040 RSI: 000055a78352e9c0 RDI: 0000000000000003 [ 192.953411] RBP: 00007fff5ecd1690 R08: 000055a78352c940 R09: 000000000000001c [ 192.953411] R10: 0000000000000000 R11: 0000000000000246 R12: 000055a783321e10 [ 192.953411] R13: 000055a7839890c0 R14: 0000000000000004 R15: 0000000000000000 [ 192.953411] Code: 00 00 48 89 44 24 10 8b 87 c4 00 00 00 48 89 44 24 08 48 8b 87 d8 00 00 00 48 c7 c7 90 58 d2 81 48 89 04 24 31 c0 e8 4f 70 9a ff <0f> 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 97 d8 00 00 [ 192.953411] RIP: skb_panic+0x61/0x70 RSP: ffffc90000ef7900 [ 193.000186] ---[ end trace bd0b89fabdf2f92c ]--- [ 193.000951] Kernel panic - not syncing: Fatal exception in interrupt [ 193.001137] Kernel Offset: disabled [ 193.001169] ---[ end Kernel panic - not syncing: Fatal exception in interrupt Fixes: 19d5a26f5ef8de5dcb78799feaf404d717b1aac3 ("ipv6: sr: expand skb head only if necessary") Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-13netlink: pass extended ACK struct to parsing functionsJohannes Berg1-1/+1
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>
2017-03-27ipv6: sr: select DST_CACHE by defaultDavid Lebrun1-18/+0
When CONFIG_IPV6_SEG6_LWTUNNEL is selected, automatically select DST_CACHE. This allows to remove multiple ifdefs. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-24ipv6: sr: use dst_cache in seg6_inputDavid Lebrun1-1/+26
We already use dst_cache in seg6_output, when handling locally generated packets. We extend it in seg6_input, to also handle forwarded packets, and avoid unnecessary fib lookups. Performances for SRH encapsulation before the patch: Result: OK: 5656067(c5655678+d388) usec, 5000000 (1000byte,0frags) 884006pps 7072Mb/sec (7072048000bps) errors: 0 Performances after the patch: Result: OK: 4774543(c4774084+d459) usec, 5000000 (1000byte,0frags) 1047220pps 8377Mb/sec (8377760000bps) errors: 0 Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-24ipv6: sr: expand skb head only if necessaryDavid Lebrun1-2/+2
To insert or encapsulate a packet with an SRH, we need a large enough skb headroom. Currently, we are using pskb_expand_head to inconditionally increase the size of the headroom by the amount needed by the SRH (and IPv6 header). If this reallocation is performed by another CPU than the one that initially allocated the skb, then when the initial CPU kfree the skb, it will enter the __slab_free slowpath, impacting performances. This patch replaces pskb_expand_head with skb_cow_head, that will reallocate the skb head only if the headroom is not large enough. Performances for SRH encapsulation before the patch: Result: OK: 7348320(c7347271+d1048) usec, 5000000 (1000byte,0frags) 680427pps 5443Mb/sec (5443416000bps) errors: 0 Performances after the patch: Result: OK: 5656067(c5655678+d388) usec, 5000000 (1000byte,0frags) 884006pps 7072Mb/sec (7072048000bps) errors: 0 Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-02-07ipv6: sr: fix non static symbol warningsWei Yongjun1-4/+4
Fixes the following sparse warnings: net/ipv6/seg6_iptunnel.c:58:5: warning: symbol 'nla_put_srh' was not declared. Should it be static? net/ipv6/seg6_iptunnel.c:238:5: warning: symbol 'seg6_input' was not declared. Should it be static? net/ipv6/seg6_iptunnel.c:254:5: warning: symbol 'seg6_output' was not declared. Should it be static? Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-30lwtunnel: remove device arg to lwtunnel_build_stateDavid Ahern1-1/+1
Nothing about lwt state requires a device reference, so remove the input argument. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-24net: Specify the owning module for lwtunnel opsRobert Shearman1-0/+1
Modules implementing lwtunnel ops should not be allowed to unload while there is state alive using those ops, so specify the owning module for all lwtunnel ops. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-13ipv6: sr: fix several BUGs when preemption is enabledDavid Lebrun1-0/+4
When CONFIG_PREEMPT=y, CONFIG_IPV6=m and CONFIG_SEG6_HMAC=y, seg6_hmac_init() is called during the initialization of the ipv6 module. This causes a subsequent call to smp_processor_id() with preemption enabled, resulting in the following trace. [ 20.451460] BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1 [ 20.452556] caller is debug_smp_processor_id+0x17/0x19 [ 20.453304] CPU: 0 PID: 1 Comm: systemd Not tainted 4.9.0-rc5-00973-g46738b1 #1 [ 20.454406] ffffc9000062fc18 ffffffff813607b2 0000000000000000 ffffffff81a7f782 [ 20.455528] ffffc9000062fc48 ffffffff813778dc 0000000000000000 00000000001dcf98 [ 20.456539] ffffffffa003bd08 ffffffff81af93e0 ffffc9000062fc58 ffffffff81377905 [ 20.456539] Call Trace: [ 20.456539] [<ffffffff813607b2>] dump_stack+0x63/0x7f [ 20.456539] [<ffffffff813778dc>] check_preemption_disabled+0xd1/0xe3 [ 20.456539] [<ffffffff81377905>] debug_smp_processor_id+0x17/0x19 [ 20.460260] [<ffffffffa0061f3b>] seg6_hmac_init+0xfa/0x192 [ipv6] [ 20.460260] [<ffffffffa0061ccc>] seg6_init+0x39/0x6f [ipv6] [ 20.460260] [<ffffffffa006121a>] inet6_init+0x21a/0x321 [ipv6] [ 20.460260] [<ffffffffa0061000>] ? 0xffffffffa0061000 [ 20.460260] [<ffffffff81000457>] do_one_initcall+0x8b/0x115 [ 20.460260] [<ffffffff811328a3>] do_init_module+0x53/0x1c4 [ 20.460260] [<ffffffff8110650a>] load_module+0x1153/0x14ec [ 20.460260] [<ffffffff81106a7b>] SYSC_finit_module+0x8c/0xb9 [ 20.460260] [<ffffffff81106a7b>] ? SYSC_finit_module+0x8c/0xb9 [ 20.460260] [<ffffffff81106abc>] SyS_finit_module+0x9/0xb [ 20.460260] [<ffffffff810014d1>] do_syscall_64+0x62/0x75 [ 20.460260] [<ffffffff816834f0>] entry_SYSCALL64_slow_path+0x25/0x25 Moreover, dst_cache_* functions also call smp_processor_id(), generating a similar trace. This patch uses raw_cpu_ptr() in seg6_hmac_init() rather than this_cpu_ptr() and disable preemption when using dst_cache_* functions. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-09ipv6: sr: add calls to verify and insert HMAC signaturesDavid Lebrun1-0/+21
This patch enables the verification of the HMAC signature for transiting SR-enabled packets, and its insertion on encapsulated/injected SRH. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-09ipv6: sr: add support for SRH encapsulation and injection with lwtunnelsDavid Lebrun1-0/+410
This patch creates a new type of interfaceless lightweight tunnel (SEG6), enabling the encapsulation and injection of SRH within locally emitted packets and forwarded packets. >From a configuration viewpoint, a seg6 tunnel would be configured as follows: ip -6 ro ad fc00::1/128 encap seg6 mode encap segs fc42::1,fc42::2,fc42::3 dev eth0 Any packet whose destination address is fc00::1 would thus be encapsulated within an outer IPv6 header containing the SRH with three segments, and would actually be routed to the first segment of the list. If `mode inline' was specified instead of `mode encap', then the SRH would be directly inserted after the IPv6 header without outer encapsulation. The inline mode is only available if CONFIG_IPV6_SEG6_INLINE is enabled. This feature was made configurable because direct header insertion may break several mechanisms such as PMTUD or IPSec AH. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
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