This patchset fixes a bug that causes skb->csum to hold an incorrect
value when calling inet_proto_csum_replace_by_diff for an IPv6 packet
in CHECKSUM_COMPLETE state. This bug affects BPF helper
bpf_l4_csum_replace and IPv6 ILA in adj-transport mode.
In those cases, inet_proto_csum_replace_by_diff updates the L4 checksum
field after an IPv6 address change. These two changes cancel each other
in terms of checksum, so skb->csum shouldn't be updated.
Changes in v2:
- For BPF, pass the new flag is_ipv6 to
inet_proto_csum_replace_by_diff directly instead of calling
inet_proto_csum_replace16.
- Document the new BPF helper flag.
- Fix the usage of inet_proto_csum_replace_by_diff in ILA in a
separate patch.
- Rebase on net tree.
- Link: https://lore.kernel.org/bpf/aCz84JU60wd8etiT@xxxxxxxxxxxxxx/
Paul Chaignon (2):
net: Fix checksum update for ILA adj-transport
bpf: Fix L4 csum update on IPv6 in CHECKSUM_COMPLETE
include/net/checksum.h | 2 +-
include/uapi/linux/bpf.h | 4 +++-
net/core/filter.c | 5 +++--
net/core/utils.c | 4 ++--
net/ipv6/ila/ila_common.c | 6 +++---
tools/include/uapi/linux/bpf.h | 4 +++-
6 files changed, 15 insertions(+), 10 deletions(-)
--
2.43.0
