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ipv4: processing ancillary IP_TOS or IP_TTL

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If IP_TOS or IP_TTL are specified as ancillary data, then sendmsg() sends out
packets with the specified TTL or TOS overriding the socket values specified
with the traditional setsockopt().

The struct inet_cork stores the values of TOS, TTL and priority that are
passed through the struct ipcm_cookie. If there are user-specified TOS
(tos != -1) or TTL (ttl != 0) in the struct ipcm_cookie, these values are
used to override the per-socket values. In case of TOS also the priority
is changed accordingly.

Two helper functions get_rttos and get_rtconn_flags are defined to take
into account the presence of a user specified TOS value when computing
RT_TOS and RT_CONN_FLAGS.

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 15:43:09 +02:00 • committed by David S. Miller
parent f02db315b8
commit aa66158145
8 changed files with 39 additions and 6 deletions
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3
include/net/inet_sock.h
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@ -103,6 +103,9 @@ struct inet_cork {
int length; /* Total length of all frames */
struct dst_entry *dst;
u8 tx_flags;
__u8 ttl;
__s16 tos;
char priority;
};
struct inet_cork_full {