Revision b210de4f8c97d57de051e805686248ec4c6cfc52 authored by Aya Levin on 07 January 2021, 13:50:18 UTC, committed by Jakub Kicinski on 09 January 2021, 22:06:32 UTC
There are cases where GSO segment's length exceeds the egress MTU:
- Forwarding of a TCP GRO skb, when DF flag is not set.
- Forwarding of an skb that arrived on a virtualisation interface
(virtio-net/vhost/tap) with TSO/GSO size set by other network
stack.
- Local GSO skb transmitted on an NETIF_F_TSO tunnel stacked over an
interface with a smaller MTU.
- Arriving GRO skb (or GSO skb in a virtualised environment) that is
bridged to a NETIF_F_TSO tunnel stacked over an interface with an
insufficient MTU.
If so:
- Consume the SKB and its segments.
- Issue an ICMP packet with 'Packet Too Big' message containing the
MTU, allowing the source host to reduce its Path MTU appropriately.
Note: These cases are handled in the same manner in IPv4 output finish.
This patch aligns the behavior of IPv6 and the one of IPv4.
Fixes: 9e50849054a4 ("netfilter: ipv6: move POSTROUTING invocation before fragmentation")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/1610027418-30438-1-git-send-email-ayal@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent a2bc221
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 30.0 KB |
| Makefile | -rw-r--r-- | 3.3 KB |
| blktrace.c | -rw-r--r-- | 45.9 KB |
| bpf_trace.c | -rw-r--r-- | 58.9 KB |
| bpf_trace.h | -rw-r--r-- | 633 bytes |
| fgraph.c | -rw-r--r-- | 16.8 KB |
| ftrace.c | -rw-r--r-- | 179.0 KB |
| ftrace_internal.h | -rw-r--r-- | 1.5 KB |
| kprobe_event_gen_test.c | -rw-r--r-- | 5.6 KB |
| power-traces.c | -rw-r--r-- | 505 bytes |
| preemptirq_delay_test.c | -rw-r--r-- | 4.2 KB |
| ring_buffer.c | -rw-r--r-- | 156.4 KB |
| ring_buffer_benchmark.c | -rw-r--r-- | 10.8 KB |
| rpm-traces.c | -rw-r--r-- | 510 bytes |
| synth_event_gen_test.c | -rw-r--r-- | 13.7 KB |
| trace.c | -rw-r--r-- | 234.5 KB |
| trace.h | -rw-r--r-- | 62.0 KB |
| trace_benchmark.c | -rw-r--r-- | 5.2 KB |
| trace_benchmark.h | -rw-r--r-- | 871 bytes |
| trace_boot.c | -rw-r--r-- | 8.4 KB |
| trace_branch.c | -rw-r--r-- | 10.1 KB |
| trace_clock.c | -rw-r--r-- | 3.6 KB |
| trace_dynevent.c | -rw-r--r-- | 11.9 KB |
| trace_dynevent.h | -rw-r--r-- | 4.6 KB |
| trace_entries.h | -rw-r--r-- | 8.2 KB |
| trace_event_perf.c | -rw-r--r-- | 12.2 KB |
| trace_events.c | -rw-r--r-- | 86.9 KB |
| trace_events_filter.c | -rw-r--r-- | 55.4 KB |
| trace_events_filter_test.h | -rw-r--r-- | 1.1 KB |
| trace_events_hist.c | -rw-r--r-- | 141.7 KB |
| trace_events_inject.c | -rw-r--r-- | 6.4 KB |
| trace_events_synth.c | -rw-r--r-- | 50.1 KB |
| trace_events_trigger.c | -rw-r--r-- | 41.0 KB |
| trace_export.c | -rw-r--r-- | 5.2 KB |
| trace_functions.c | -rw-r--r-- | 18.1 KB |
| trace_functions_graph.c | -rw-r--r-- | 32.5 KB |
| trace_hwlat.c | -rw-r--r-- | 16.8 KB |
| trace_irqsoff.c | -rw-r--r-- | 17.6 KB |
| trace_kdb.c | -rw-r--r-- | 3.5 KB |
| trace_kprobe.c | -rw-r--r-- | 51.1 KB |
| trace_kprobe_selftest.c | -rw-r--r-- | 353 bytes |
| trace_kprobe_selftest.h | -rw-r--r-- | 313 bytes |
| trace_mmiotrace.c | -rw-r--r-- | 8.6 KB |
| trace_nop.c | -rw-r--r-- | 2.2 KB |
| trace_output.c | -rw-r--r-- | 30.7 KB |
| trace_output.h | -rw-r--r-- | 1.3 KB |
| trace_preemptirq.c | -rw-r--r-- | 3.6 KB |
| trace_printk.c | -rw-r--r-- | 8.7 KB |
| trace_probe.c | -rw-r--r-- | 26.4 KB |
| trace_probe.h | -rw-r--r-- | 14.6 KB |
| trace_probe_tmpl.h | -rw-r--r-- | 5.6 KB |
| trace_recursion_record.c | -rw-r--r-- | 6.1 KB |
| trace_sched_switch.c | -rw-r--r-- | 3.1 KB |
| trace_sched_wakeup.c | -rw-r--r-- | 19.6 KB |
| trace_selftest.c | -rw-r--r-- | 26.3 KB |
| trace_selftest_dynamic.c | -rw-r--r-- | 270 bytes |
| trace_seq.c | -rw-r--r-- | 10.4 KB |
| trace_stack.c | -rw-r--r-- | 14.6 KB |
| trace_stat.c | -rw-r--r-- | 7.6 KB |
| trace_stat.h | -rw-r--r-- | 992 bytes |
| trace_synth.h | -rw-r--r-- | 868 bytes |
| trace_syscalls.c | -rw-r--r-- | 20.4 KB |
| trace_uprobe.c | -rw-r--r-- | 37.7 KB |
| tracing_map.c | -rw-r--r-- | 29.8 KB |
| tracing_map.h | -rw-r--r-- | 11.3 KB |
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