diff options
| author | Francesco Fusco <ffusco@redhat.com> | 2013-09-24 17:43:08 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-29 02:21:51 +0400 |
| commit | f02db315b8d888570cb0d4496cfbb7e4acb047cb (patch) | |
| tree | e7ab8fcd05f0ba442a6eb3914ff4c894611a97a6 | |
| parent | f0e28d48c8641beac1239e484383c2b4764b1f02 (diff) | |
| download | linux-f02db315b8d888570cb0d4496cfbb7e4acb047cb.tar.xz | |
ipv4: IP_TOS and IP_TTL can be specified as ancillary data
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>
| -rw-r--r-- | include/net/ip.h | 3 | ||||
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 20 |
2 files changed, 22 insertions, 1 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index c1f192b8cd0e..0135f3823e66 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -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)) diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index d9c4f113d709..56e34457ac07 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -189,7 +189,7 @@ EXPORT_SYMBOL(ip_cmsg_recv); int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) { - int err; + int err, val; struct cmsghdr *cmsg; for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { @@ -215,6 +215,24 @@ int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) ipc->addr = info->ipi_spec_dst.s_addr; break; } + case IP_TTL: + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) + return -EINVAL; + val = *(int *)CMSG_DATA(cmsg); + if (val < 1 || val > 255) + return -EINVAL; + ipc->ttl = val; + break; + case IP_TOS: + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) + return -EINVAL; + val = *(int *)CMSG_DATA(cmsg); + if (val < 0 || val > 255) + return -EINVAL; + ipc->tos = val; + ipc->priority = rt_tos2priority(ipc->tos); + break; + default: return -EINVAL; } |