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fib, fib6: reject invalid feature bits

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Feature bits that are invalid should not be accepted by the kernel,
only the lower 4 bits may be configured, but not the remaining ones.
Even from these 4, 2 of them are unused.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-08-31 15:58:46 +02:00 committed by David S. Miller
parent 1bb14807bc
commit b8d3e4163a
3 changed files with 11 additions and 4 deletions
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11
include/uapi/linux/rtnetlink.h
View file

@ -418,10 +418,13 @@ enum {
#define RTAX_MAX (__RTAX_MAX - 1)
#define RTAX_FEATURE_ECN 0x00000001
#define RTAX_FEATURE_SACK 0x00000002
#define RTAX_FEATURE_TIMESTAMP 0x00000004
#define RTAX_FEATURE_ALLFRAG 0x00000008
#define RTAX_FEATURE_ECN (1 << 0)
#define RTAX_FEATURE_SACK (1 << 1)
#define RTAX_FEATURE_TIMESTAMP (1 << 2)
#define RTAX_FEATURE_ALLFRAG (1 << 3)
#define RTAX_FEATURE_MASK (RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | \
RTAX_FEATURE_TIMESTAMP | RTAX_FEATURE_ALLFRAG)
struct rta_session {
__u8 proto;

2
net/ipv4/fib_semantics.c
View file

@ -908,6 +908,8 @@ fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg)
val = 65535 - 40;
if (type == RTAX_MTU && val > 65535 - 15)
val = 65535 - 15;
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
return -EINVAL;
fi->fib_metrics[type - 1] = val;
}

2
net/ipv6/route.c
View file

@ -1728,6 +1728,8 @@ static int ip6_convert_metrics(struct mx6_config *mxc,
} else {
val = nla_get_u32(nla);
}
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
goto err;
mp[type - 1] = val;
__set_bit(type - 1, mxc->mx_valid);