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Date: Sun, 16 Feb 2020 23:47:15 +0100 (CET)
From: Michal Kubecek <mkubecek@...e.cz>
To: John Linville <linville@...driver.com>, netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH ethtool 09/19] netlink: initialize ethtool netlink socket
As part of the netlink initialization, set up netlink socket for ethtool
netlink and get id of ethtool genetlink family and monitor multicast group.
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
netlink/netlink.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++-
netlink/netlink.h | 11 ++++++
2 files changed, 104 insertions(+), 1 deletion(-)
diff --git a/netlink/netlink.c b/netlink/netlink.c
index 7d5eca666c84..2128e2775e12 100644
--- a/netlink/netlink.c
+++ b/netlink/netlink.c
@@ -9,6 +9,8 @@
#include "../internal.h"
#include "netlink.h"
#include "extapi.h"
+#include "msgbuff.h"
+#include "nlsock.h"
/* Used as reply callback for requests where no reply is expected (e.g. most
* "set" type commands)
@@ -40,18 +42,108 @@ int attr_cb(const struct nlattr *attr, void *data)
/* initialization */
+struct fam_info {
+ const char *fam_name;
+ const char *grp_name;
+ uint16_t fam_id;
+ uint32_t grp_id;
+};
+
+static void find_mc_group(struct nlattr *nest, struct fam_info *info)
+{
+ const struct nlattr *grp_tb[CTRL_ATTR_MCAST_GRP_MAX + 1] = {};
+ DECLARE_ATTR_TB_INFO(grp_tb);
+ struct nlattr *grp_attr;
+ int ret;
+
+ mnl_attr_for_each_nested(grp_attr, nest) {
+ ret = mnl_attr_parse_nested(grp_attr, attr_cb, &grp_tb_info);
+ if (ret < 0)
+ return;
+ if (!grp_tb[CTRL_ATTR_MCAST_GRP_NAME] ||
+ !grp_tb[CTRL_ATTR_MCAST_GRP_ID])
+ continue;
+ if (strcmp(mnl_attr_get_str(grp_tb[CTRL_ATTR_MCAST_GRP_NAME]),
+ info->grp_name))
+ continue;
+ info->grp_id =
+ mnl_attr_get_u32(grp_tb[CTRL_ATTR_MCAST_GRP_ID]);
+ return;
+ }
+}
+
+static int family_info_cb(const struct nlmsghdr *nlhdr, void *data)
+{
+ struct fam_info *info = data;
+ struct nlattr *attr;
+
+ mnl_attr_for_each(attr, nlhdr, GENL_HDRLEN) {
+ switch (mnl_attr_get_type(attr)) {
+ case CTRL_ATTR_FAMILY_ID:
+ info->fam_id = mnl_attr_get_u16(attr);
+ break;
+ case CTRL_ATTR_MCAST_GROUPS:
+ find_mc_group(attr, info);
+ break;
+ }
+ }
+
+ return MNL_CB_OK;
+}
+
+static int get_genl_family(struct nl_socket *nlsk, struct fam_info *info)
+{
+ struct nl_msg_buff *msgbuff = &nlsk->msgbuff;
+ int ret;
+
+ nlsk->nlctx->suppress_nlerr = true;
+ ret = __msg_init(msgbuff, GENL_ID_CTRL, CTRL_CMD_GETFAMILY,
+ NLM_F_REQUEST | NLM_F_ACK, 1);
+ if (ret < 0)
+ goto out;
+ ret = -EMSGSIZE;
+ if (ethnla_put_strz(msgbuff, CTRL_ATTR_FAMILY_NAME, info->fam_name))
+ goto out;
+
+ nlsock_sendmsg(nlsk, NULL);
+ nlsock_process_reply(nlsk, family_info_cb, info);
+ ret = info->fam_id ? 0 : -EADDRNOTAVAIL;
+
+out:
+ nlsk->nlctx->suppress_nlerr = false;
+ return ret;
+}
+
int netlink_init(struct cmd_context *ctx)
{
+ struct fam_info info = {
+ .fam_name = ETHTOOL_GENL_NAME,
+ .grp_name = ETHTOOL_MCGRP_MONITOR_NAME,
+ };
struct nl_context *nlctx;
+ int ret;
nlctx = calloc(1, sizeof(*nlctx));
if (!nlctx)
return -ENOMEM;
nlctx->ctx = ctx;
+ ret = nlsock_init(nlctx, &nlctx->ethnl_socket);
+ if (ret < 0)
+ goto out_free;
+ ret = get_genl_family(nlctx->ethnl_socket, &info);
+ if (ret < 0)
+ goto out_nlsk;
+ nlctx->ethnl_fam = info.fam_id;
+ nlctx->ethnl_mongrp = info.grp_id;
ctx->nlctx = nlctx;
-
return 0;
+
+out_nlsk:
+ nlsock_done(nlctx->ethnl_socket);
+out_free:
+ free(nlctx);
+ return ret;
}
void netlink_done(struct cmd_context *ctx)
diff --git a/netlink/netlink.h b/netlink/netlink.h
index 54d2baaab516..081226be73e8 100644
--- a/netlink/netlink.h
+++ b/netlink/netlink.h
@@ -11,6 +11,7 @@
#include <linux/netlink.h>
#include <linux/genetlink.h>
#include <linux/ethtool_netlink.h>
+#include "nlsock.h"
#define WILDCARD_DEVNAME "*"
@@ -22,6 +23,9 @@ struct nl_context {
int exit_code;
bool suppress_nlerr;
uint16_t ethnl_fam;
+ uint32_t ethnl_mongrp;
+ struct nl_socket *ethnl_socket;
+ struct nl_socket *ethnl2_socket;
};
struct attr_tb_info {
@@ -35,4 +39,11 @@ struct attr_tb_info {
int nomsg_reply_cb(const struct nlmsghdr *nlhdr, void *data);
int attr_cb(const struct nlattr *attr, void *data);
+static inline int netlink_init_ethnl2_socket(struct nl_context *nlctx)
+{
+ if (nlctx->ethnl2_socket)
+ return 0;
+ return nlsock_init(nlctx, &nlctx->ethnl2_socket);
+}
+
#endif /* ETHTOOL_NETLINK_INT_H__ */
--
2.25.0
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