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Date: Tue, 11 Sep 2012 12:04:33 +0300
From: Julian Anastasov <ja@....bg>
To: Stephen Hemminger <shemminger@...tta.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH v2 1/2] iproute2: add libgenl files
Create libgenl.h and libgenl.c. They will contain
common code for GENL users such as ipl2tp, tcp_metrics, etc.
Signed-off-by: Julian Anastasov <ja@....bg>
---
include/libgenl.h | 29 +++++++++++++++++++++++
lib/Makefile | 2 +-
lib/libgenl.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 95 insertions(+), 1 deletions(-)
create mode 100644 include/libgenl.h
create mode 100644 lib/libgenl.c
diff --git a/include/libgenl.h b/include/libgenl.h
new file mode 100644
index 0000000..7862292
--- /dev/null
+++ b/include/libgenl.h
@@ -0,0 +1,29 @@
+#ifndef __LIBGENL_H__
+#define __LIBGENL_H__
+
+#include "libnetlink.h"
+
+#define GENL_DEFINE_REQUEST(req, hdrsize, bufsiz) \
+struct { \
+ struct nlmsghdr n; \
+ struct genlmsghdr g; \
+ char buf[NLMSG_ALIGN(hdrsize) + (bufsiz)]; \
+} req
+
+#define GENL_INIT_REQUEST(req, family, hdrsize, ver, cmd_, flags) \
+ do { \
+ req.n = (struct nlmsghdr) { \
+ .nlmsg_type = (family), \
+ .nlmsg_flags = (flags), \
+ .nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN + \
+ (hdrsize)), \
+ }; \
+ req.g = (struct genlmsghdr) { \
+ .cmd = (cmd_), \
+ .version = (ver), \
+ }; \
+ } while (0)
+
+extern int genl_resolve_family(struct rtnl_handle *grth, const char *family);
+
+#endif /* __LIBGENL_H__ */
diff --git a/lib/Makefile b/lib/Makefile
index da2f0fc..bfbe672 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -2,7 +2,7 @@ CFLAGS += -fPIC
UTILOBJ=utils.o rt_names.o ll_types.o ll_proto.o ll_addr.o inet_proto.o
-NLOBJ=ll_map.o libnetlink.o
+NLOBJ=libgenl.o ll_map.o libnetlink.o
all: libnetlink.a libutil.a
diff --git a/lib/libgenl.c b/lib/libgenl.c
new file mode 100644
index 0000000..e7ddf95
--- /dev/null
+++ b/lib/libgenl.c
@@ -0,0 +1,65 @@
+/*
+ * libgenl.c GENL library
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <linux/genetlink.h>
+#include "libgenl.h"
+
+static int genl_parse_getfamily(struct nlmsghdr *nlh)
+{
+ struct rtattr *tb[CTRL_ATTR_MAX + 1];
+ struct genlmsghdr *ghdr = NLMSG_DATA(nlh);
+ int len = nlh->nlmsg_len;
+ struct rtattr *attrs;
+
+ if (nlh->nlmsg_type != GENL_ID_CTRL) {
+ fprintf(stderr, "Not a controller message, nlmsg_len=%d "
+ "nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type);
+ return -1;
+ }
+
+ len -= NLMSG_LENGTH(GENL_HDRLEN);
+
+ if (len < 0) {
+ fprintf(stderr, "wrong controller message len %d\n", len);
+ return -1;
+ }
+
+ if (ghdr->cmd != CTRL_CMD_NEWFAMILY) {
+ fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd);
+ return -1;
+ }
+
+ attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
+ parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
+
+ if (tb[CTRL_ATTR_FAMILY_ID] == NULL) {
+ fprintf(stderr, "Missing family id TLV\n");
+ return -1;
+ }
+
+ return rta_getattr_u16(tb[CTRL_ATTR_FAMILY_ID]);
+}
+
+int genl_resolve_family(struct rtnl_handle *grth, const char *family)
+{
+ GENL_DEFINE_REQUEST(req, 0, 1024);
+
+ GENL_INIT_REQUEST(req, GENL_ID_CTRL, 0, 0, CTRL_CMD_GETFAMILY,
+ NLM_F_REQUEST);
+
+ addattr_l(&req.n, 1024, CTRL_ATTR_FAMILY_NAME,
+ family, strlen(family) + 1);
+
+ if (rtnl_talk(grth, &req.n, 0, 0, &req.n) < 0) {
+ fprintf(stderr, "Error talking to the kernel\n");
+ return -2;
+ }
+
+ return genl_parse_getfamily(&req.n);
+}
+
--
1.7.3.4
--
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