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Message-Id: <20200824175108.53101-2-johannes@sipsolutions.net>
Date: Mon, 24 Aug 2020 19:51:07 +0200
From: Johannes Berg <johannes@...solutions.net>
To: linux-wireless@...r.kernel.org,
Stephen Hemminger <stephen@...workplumber.org>,
netdev@...r.kernel.org
Cc: David Ahern <dsahern@...il.com>
Subject: [PATCH 2/3] libnetlink: add nl_print_policy() helper
This prints out the data from the given nested attribute
to the given FILE pointer, interpreting the firmware that
the kernel has for showing netlink policies.
Signed-off-by: Johannes Berg <johannes@...solutions.net>
---
include/libnetlink.h | 2 ++
lib/libnetlink.c | 73 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index 0d4a9f29afbd..b9073a6a13ad 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -289,4 +289,6 @@ int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
RTA_OK(attr, RTA_PAYLOAD(nest) - ((char *)(attr) - (char *)RTA_DATA((nest)))); \
(attr) = RTA_TAIL((attr)))
+void nl_print_policy(const struct rtattr *attr, FILE *fp);
+
#endif /* __LIBNETLINK_H__ */
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index e02d6294b02e..a7b60d873afb 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -28,6 +28,7 @@
#include <linux/nexthop.h>
#include "libnetlink.h"
+#include "utils.h"
#define __aligned(x) __attribute__((aligned(x)))
@@ -1440,3 +1441,75 @@ int __parse_rtattr_nested_compat(struct rtattr *tb[], int max,
memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
return 0;
}
+
+static const char *get_nla_type_str(unsigned int attr)
+{
+ switch (attr) {
+#define C(x) case NL_ATTR_TYPE_ ## x: return #x
+ C(U8);
+ C(U16);
+ C(U32);
+ C(U64);
+ C(STRING);
+ C(FLAG);
+ C(NESTED);
+ C(NESTED_ARRAY);
+ C(NUL_STRING);
+ C(BINARY);
+ C(S8);
+ C(S16);
+ C(S32);
+ C(S64);
+ C(BITFIELD32);
+ default:
+ return "unknown";
+ }
+}
+
+void nl_print_policy(const struct rtattr *attr, FILE *fp)
+{
+ const struct rtattr *pos;
+
+ rtattr_for_each_nested(pos, attr) {
+ const struct rtattr *attr;
+
+ fprintf(fp, " policy[%u]:", pos->rta_type & ~NLA_F_NESTED);
+
+ rtattr_for_each_nested(attr, pos) {
+ struct rtattr *tp[NL_POLICY_TYPE_ATTR_MAX + 1];
+
+ parse_rtattr_nested(tp, ARRAY_SIZE(tp) - 1, attr);
+
+ if (tp[NL_POLICY_TYPE_ATTR_TYPE])
+ fprintf(fp, "attr[%u]: type=%s",
+ attr->rta_type & ~NLA_F_NESTED,
+ get_nla_type_str(rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_TYPE])));
+
+ if (tp[NL_POLICY_TYPE_ATTR_POLICY_IDX])
+ fprintf(fp, " policy:%u",
+ rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_IDX]));
+
+ if (tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE])
+ fprintf(fp, " maxattr:%u",
+ rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE]));
+
+ if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S])
+ fprintf(fp, " range:[%lld,%lld]",
+ (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S]),
+ (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S]));
+
+ if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U])
+ fprintf(fp, " range:[%llu,%llu]",
+ (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U]),
+ (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U]));
+
+ if (tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH])
+ fprintf(fp, " min len:%u",
+ rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH]));
+
+ if (tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH])
+ fprintf(fp, " max len:%u",
+ rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH]));
+ }
+ }
+}
--
2.26.2
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