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| author | Ilia K <mail4ilia@gmail.com> | 2009-09-16 05:53:07 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-07 00:48:41 -0700 |
| commit | ee5e81f00051b5c373c8de16e3604fd6d3be699e (patch) | |
| tree | f10ed0120d1669cf903752c3595fbb4b213795f5 /include | |
| parent | 7bb5fdc2fb021e32703ed1ff0269876bde1fa962 (diff) | |
| download | linux-ee5e81f00051b5c373c8de16e3604fd6d3be699e.tar.bz2 | |
add vif using local interface index instead of IP
When routing daemon wants to enable forwarding of multicast traffic it
performs something like:
struct vifctl vc = {
.vifc_vifi = 1,
.vifc_flags = 0,
.vifc_threshold = 1,
.vifc_rate_limit = 0,
.vifc_lcl_addr = ip, /* <--- ip address of physical
interface, e.g. eth0 */
.vifc_rmt_addr.s_addr = htonl(INADDR_ANY),
};
setsockopt(fd, IPPROTO_IP, MRT_ADD_VIF, &vc, sizeof(vc));
This leads (in the kernel) to calling vif_add() function call which
search the (physical) device using assigned IP address:
dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
The current API (struct vifctl) does not allow to specify an
interface other way than using it's IP, and if there are more than a
single interface with specified IP only the first one will be found.
The attached patch (against 2.6.30.4) allows to specify an interface
by its index, instead of IP address:
struct vifctl vc = {
.vifc_vifi = 1,
.vifc_flags = VIFF_USE_IFINDEX, /* NEW */
.vifc_threshold = 1,
.vifc_rate_limit = 0,
.vifc_lcl_ifindex = if_nametoindex("eth0"), /* NEW */
.vifc_rmt_addr.s_addr = htonl(INADDR_ANY),
};
setsockopt(fd, IPPROTO_IP, MRT_ADD_VIF, &vc, sizeof(vc));
Signed-off-by: Ilia K. <mail4ilia@gmail.com>
=== modified file 'include/linux/mroute.h'
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mroute.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/include/linux/mroute.h b/include/linux/mroute.h index 08bc776d05e2..d5f69151f692 100644 --- a/include/linux/mroute.h +++ b/include/linux/mroute.h @@ -59,13 +59,18 @@ struct vifctl { unsigned char vifc_flags; /* VIFF_ flags */ unsigned char vifc_threshold; /* ttl limit */ unsigned int vifc_rate_limit; /* Rate limiter values (NI) */ - struct in_addr vifc_lcl_addr; /* Our address */ + union { + struct in_addr vifc_lcl_addr; /* Local interface address */ + int vifc_lcl_ifindex; /* Local interface index */ + }; struct in_addr vifc_rmt_addr; /* IPIP tunnel addr */ }; -#define VIFF_TUNNEL 0x1 /* IPIP tunnel */ -#define VIFF_SRCRT 0x2 /* NI */ -#define VIFF_REGISTER 0x4 /* register vif */ +#define VIFF_TUNNEL 0x1 /* IPIP tunnel */ +#define VIFF_SRCRT 0x2 /* NI */ +#define VIFF_REGISTER 0x4 /* register vif */ +#define VIFF_USE_IFINDEX 0x8 /* use vifc_lcl_ifindex instead of + vifc_lcl_addr to find an interface */ /* * Cache manipulation structures for mrouted and PIMd |