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Message-ID: <20231107080607.190414-6-jiri@resnulli.us>
Date: Tue, 7 Nov 2023 09:06:05 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org,
dsahern@...il.com,
daniel.machon@...rochip.com
Subject: [patch iproute2-next v5 5/7] devlink: introduce support for netns id for nested handle
From: Jiri Pirko <jiri@...dia.com>
Nested handle may contain DEVLINK_ATTR_NETNS_ID attribute that indicates
the network namespace where the nested devlink instance resides. Process
this converting to netns name if possible and print to user.
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v2->v3:
- moved netns_name_by_id() into lib/namespace.c
- s/netns_name_by_id/netns_name_from_id/
- rebased on top of new patch "devlink: extend pr_out_nested_handle() to
print object"
v1->v2:
- use previously introduced netns_netnsid_from_name() instead of code
duplication for the same function.
- s/nesns_name_by_id_func/netns_name_by_id_func/
---
devlink/devlink.c | 23 ++++++++++++++++++++++-
include/namespace.h | 1 +
lib/namespace.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 1 deletion(-)
diff --git a/devlink/devlink.c b/devlink/devlink.c
index f06f3069e80a..f276026b9ba7 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -24,6 +24,7 @@
#include <linux/genetlink.h>
#include <linux/devlink.h>
#include <linux/netlink.h>
+#include <linux/net_namespace.h>
#include <libmnl/libmnl.h>
#include <netinet/ether.h>
#include <sys/select.h>
@@ -722,6 +723,7 @@ static const enum mnl_attr_data_type devlink_policy[DEVLINK_ATTR_MAX + 1] = {
[DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES] = MNL_TYPE_NESTED,
[DEVLINK_ATTR_NESTED_DEVLINK] = MNL_TYPE_NESTED,
[DEVLINK_ATTR_SELFTESTS] = MNL_TYPE_NESTED,
+ [DEVLINK_ATTR_NETNS_ID] = MNL_TYPE_U32,
};
static const enum mnl_attr_data_type
@@ -2866,7 +2868,26 @@ static void __pr_out_nested_handle(struct dl *dl, struct nlattr *nla_nested_dl,
return;
}
- __pr_out_handle_start(dl, tb, false, false);
+ __pr_out_handle_start(dl, tb, tb[DEVLINK_ATTR_NETNS_ID], false);
+ if (tb[DEVLINK_ATTR_NETNS_ID]) {
+ int32_t id = mnl_attr_get_u32(tb[DEVLINK_ATTR_NETNS_ID]);
+
+ if (id >= 0) {
+ char *name = netns_name_from_id(id);
+
+ if (name) {
+ print_string(PRINT_ANY, "netns",
+ " netns %s", name);
+ free(name);
+ } else {
+ print_int(PRINT_ANY, "netnsid",
+ " netnsid %d", id);
+ }
+ } else {
+ print_string(PRINT_FP, NULL, " netnsid %s", "unknown");
+ print_int(PRINT_JSON, "netnsid", NULL, id);
+ }
+ }
pr_out_handle_end(dl);
}
diff --git a/include/namespace.h b/include/namespace.h
index 2843f4bb5742..86000543f99f 100644
--- a/include/namespace.h
+++ b/include/namespace.h
@@ -60,5 +60,6 @@ struct netns_func {
};
int netns_id_from_name(struct rtnl_handle *rtnl, const char *name);
+char *netns_name_from_id(int32_t id);
#endif /* __NAMESPACE_H__ */
diff --git a/lib/namespace.c b/lib/namespace.c
index f03f4bbabceb..d3aeb9658e73 100644
--- a/lib/namespace.c
+++ b/lib/namespace.c
@@ -188,3 +188,37 @@ out:
free(answer);
return ret;
}
+
+struct netns_name_from_id_ctx {
+ int32_t id;
+ char *name;
+ struct rtnl_handle *rth;
+};
+
+static int netns_name_from_id_func(char *nsname, void *arg)
+{
+ struct netns_name_from_id_ctx *ctx = arg;
+ int32_t ret;
+
+ ret = netns_id_from_name(ctx->rth, nsname);
+ if (ret < 0 || ret != ctx->id)
+ return 0;
+ ctx->name = strdup(nsname);
+ return 1;
+}
+
+char *netns_name_from_id(int32_t id)
+{
+ struct rtnl_handle rth;
+ struct netns_name_from_id_ctx ctx = {
+ .id = id,
+ .rth = &rth,
+ };
+
+ if (rtnl_open(&rth, 0) < 0)
+ return NULL;
+ netns_foreach(netns_name_from_id_func, &ctx);
+ rtnl_close(&rth);
+
+ return ctx.name;
+}
--
2.41.0
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