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| author | Eric Dumazet <edumazet@google.com> | 2023-07-20 14:09:01 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-07-24 11:39:31 +0300 |
| commit | f5f80e32de12fad2813d37270e8364a03e6d3ef0 (patch) | |
| tree | 40646cf495a3ae868afc96d9d63fba08834be509 /net/mptcp/protocol.c | |
| parent | 1671bcfd76fdc0b9e65153cf759153083755fe4c (diff) | |
| download | linux-f5f80e32de12fad2813d37270e8364a03e6d3ef0.tar.xz | |
ipv6: remove hard coded limitation on ipv6_pinfo
IPv6 inet sockets are supposed to have a "struct ipv6_pinfo"
field at the end of their definition, so that inet6_sk_generic()
can derive from socket size the offset of the "struct ipv6_pinfo".
This is very fragile, and prevents adding bigger alignment
in sockets, because inet6_sk_generic() does not work
if the compiler adds padding after the ipv6_pinfo component.
We are currently working on a patch series to reorganize
TCP structures for better data locality and found issues
similar to the one fixed in commit f5d547676ca0
("tcp: fix tcp_inet6_sk() for 32bit kernels")
Alternative would be to force an alignment on "struct ipv6_pinfo",
greater or equal to __alignof__(any ipv6 sock) to ensure there is
no padding. This does not look great.
v2: fix typo in mptcp_proto_v6_init() (Paolo)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Chao Wu <wwchao@google.com>
Cc: Wei Wang <weiwan@google.com>
Cc: Coco Li <lixiaoyan@google.com>
Cc: YiFei Zhu <zhuyifei@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/protocol.c')
| -rw-r--r-- | net/mptcp/protocol.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 3613489eb6e3..22323b1fa184 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3988,6 +3988,7 @@ int __init mptcp_proto_v6_init(void) strcpy(mptcp_v6_prot.name, "MPTCPv6"); mptcp_v6_prot.slab = NULL; mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock); + mptcp_v6_prot.ipv6_pinfo_offset = offsetof(struct mptcp6_sock, np); err = proto_register(&mptcp_v6_prot, 1); if (err) |