The previous function use general message and will dump all interfaces'
information. Now update with ifinfomsg so we could get specific interface's
information.
We still could get all interfaces' info if set if_index to 0.
Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
---
port.c | 2 +-
rtnl.c | 12 +++++++-----
rtnl.h | 7 ++++---
3 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/port.c b/port.c
index 849a7c1..21ab3ea 100644
--- a/port.c
+++ b/port.c
@@ -1512,7 +1512,7 @@ static int port_initialize(struct port *p)
if (p->fda.fd[FD_RTNL] == -1)
p->fda.fd[FD_RTNL] = rtnl_open();
if (p->fda.fd[FD_RTNL] >= 0)
- rtnl_link_query(p->fda.fd[FD_RTNL]);
+ rtnl_link_query(p->fda.fd[FD_RTNL], 0);
}
port_nrate_initialize(p);
diff --git a/rtnl.c b/rtnl.c
index d7a430d..04e1918 100644
--- a/rtnl.c
+++ b/rtnl.c
@@ -42,7 +42,7 @@ int rtnl_close(int fd)
return close(fd);
}
-int rtnl_link_query(int fd)
+int rtnl_link_query(int fd, unsigned int if_index)
{
struct sockaddr_nl sa;
struct msghdr msg;
@@ -51,19 +51,21 @@ int rtnl_link_query(int fd)
struct {
struct nlmsghdr hdr;
- struct rtgenmsg gen;
+ struct ifinfomsg ifm;
} __attribute__((packed)) request;
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
memset(&request, 0, sizeof(request));
- request.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(request.gen));
+ request.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(request.ifm));
request.hdr.nlmsg_type = RTM_GETLINK;
- request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ request.hdr.nlmsg_flags = NLM_F_REQUEST;
request.hdr.nlmsg_seq = 1;
request.hdr.nlmsg_pid = 0;
- request.gen.rtgen_family = AF_UNSPEC;
+ request.ifm.ifi_family = AF_UNSPEC;
+ request.ifm.ifi_index = if_index;
+ request.ifm.ifi_change = 0xffffffff;
iov.iov_base = &request;
iov.iov_len = sizeof(request);
diff --git a/rtnl.h b/rtnl.h
index f1871f2..b4db40e 100644
--- a/rtnl.h
+++ b/rtnl.h
@@ -31,10 +31,11 @@ int rtnl_close(int fd);
/**
* Request the link status from the kernel.
- * @param fd A socket obtained via rtnl_open().
- * @return Zero on success, non-zero otherwise.
+ * @param fd A socket obtained via rtnl_open().
+ * @param index An interface index.
+ * @return Zero on success, non-zero otherwise.
*/
-int rtnl_link_query(int fd);
+int rtnl_link_query(int fd, unsigned int index);
/**
* Read kernel messages looking for a link up/down events.
--
2.5.5
------------------------------------------------------------------------------
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