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net: allow gro_max_size to exceed 65536

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Allow the gro_max_size to exceed a value larger than 65536.

There weren't really any external limitations that prevented this other
than the fact that IPv4 only supports a 16 bit length field. Since we have
the option of adding a hop-by-hop header for IPv6 we can allow IPv6 to
exceed this value and for IPv4 and non-TCP flows we can cap things at 65536
via a constant rather than relying on gro_max_size.

[edumazet] limit GRO_MAX_SIZE to (8 * 65535) to avoid overflows.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2022-05-13 11:34:03 -07:00
committed by David S. Miller
parent 81fbc81213
commit 0fe79f28bf
6 changed files with 16 additions and 12 deletions
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8
net/core/rtnetlink.c
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@@ -2360,14 +2360,6 @@ static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
}
}
if (tb[IFLA_GRO_MAX_SIZE]) {
u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
if (gro_max_size > GRO_MAX_SIZE) {
NL_SET_ERR_MSG(extack, "too big gro_max_size");
return -EINVAL;
}
}
return 0;
}