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ipv4: IP_TOS and IP_TTL can be specified as ancillary data

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This patch enables the IP_TTL and IP_TOS values passed from userspace to
be stored in the ipcm_cookie struct. Three fields are added to the struct:

- the TTL, expressed as __u8.
  The allowed values are in the [1-255].
  A value of 0 means that the TTL is not specified.

- the TOS, expressed as __s16.
  The allowed values are in the range [0,255].
  A value of -1 means that the TOS is not specified.

- the priority, expressed as a char and computed when
  handling the ancillary data.

Signed-off-by: Francesco Fusco <ffusco@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Francesco Fusco 2013-09-24 15:43:08 +02:00 • committed by David S. Miller
parent f0e28d48c8
commit f02db315b8
2 changed files with 22 additions and 1 deletions
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3
include/net/ip.h
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@ -56,6 +56,9 @@ struct ipcm_cookie {
int oif;
struct ip_options_rcu *opt;
__u8 tx_flags;
__u8 ttl;
__s16 tos;
char priority;
};
#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))