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From 856c0c40eb221499b7326c216aaf87691062eacb Mon Sep 17 00:00:00 2001
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From: Michal Kubecek <mkubecek@suse.cz>
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Date: Mon, 19 Oct 2020 23:32:40 +0200
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Subject: [PATCH 34/37] netlink: support u32 enumerated types in pretty
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printing
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Some numeric attributes take values from a short list/range with symbolic
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names. Showing the symbolic names instead of numeric values will make the
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pretty printed netlink messages easier to read. If the value is too big for
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provided names array (e.g. running on newer kernel) or the name is omitted,
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numeric attribute value is shown.
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Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
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(cherry picked from commit c7fe2f38477f5f90569f73bacd6fab3a8a739f62)
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---
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netlink/prettymsg.c | 9 +++++++++
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netlink/prettymsg.h | 18 ++++++++++++++++--
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2 files changed, 25 insertions(+), 2 deletions(-)
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diff --git a/netlink/prettymsg.c b/netlink/prettymsg.c
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index f992dcaf071f..d5d999fddfbb 100644
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--- a/netlink/prettymsg.c
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+++ b/netlink/prettymsg.c
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@@ -137,6 +137,15 @@ static int pretty_print_attr(const struct nlattr *attr,
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case NLA_BOOL:
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printf("%s", mnl_attr_get_u8(attr) ? "on" : "off");
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break;
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+ case NLA_U32_ENUM: {
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+ uint32_t val = mnl_attr_get_u32(attr);
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+
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+ if (adesc && val < adesc->n_names && adesc->names[val])
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+ printf("%s", adesc->names[val]);
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+ else
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+ printf("%u", val);
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+ break;
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+ }
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default:
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if (alen <= __DUMP_LINE)
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__print_binary_short(adata, alen);
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diff --git a/netlink/prettymsg.h b/netlink/prettymsg.h
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index b5e5f735ac8a..6987c6ec5bca 100644
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--- a/netlink/prettymsg.h
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+++ b/netlink/prettymsg.h
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@@ -28,13 +28,20 @@ enum pretty_nla_format {
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NLA_BOOL,
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NLA_NESTED,
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NLA_ARRAY,
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+ NLA_U32_ENUM,
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};
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struct pretty_nla_desc {
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enum pretty_nla_format format;
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const char *name;
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- const struct pretty_nla_desc *children;
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- unsigned int n_children;
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+ union {
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+ const struct pretty_nla_desc *children;
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+ const char *const *names;
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+ };
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+ union {
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+ unsigned int n_children;
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+ unsigned int n_names;
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+ };
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};
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struct pretty_nlmsg_desc {
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@@ -81,6 +88,13 @@ struct pretty_nlmsg_desc {
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.children = __ ## _children_desc ## _desc, \
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.n_children = 1, \
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}
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+#define NLATTR_DESC_U32_ENUM(_name, _names_table) \
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+ [_name] = { \
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+ .format = NLA_U32_ENUM, \
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+ .name = #_name, \
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+ .names = __ ## _names_table ## _names, \
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+ .n_children = ARRAY_SIZE(__ ## _names_table ## _names), \
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+ }
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#define NLMSG_DESC(_name, _attrs) \
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[_name] = { \
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--
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2.26.2
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