From: JingPiao Chen <chenjingpiao@gmail.com>
Date: Tue, 22 Aug 2017 06:45:48 +0000 (+0800)
Subject: rtnl_addr: decode ifaddrmsg netlink attributes
X-Git-Tag: v4.19~73
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f076c7866790012c7c56c7b1ddd022aaf840c874;p=strace

rtnl_addr: decode ifaddrmsg netlink attributes

* rtnl_addr.c (decode_ifa_address,
decode_ifa_cacheinfo, decode_ifa_flags): New functions.
(ifaddrmsg_nla_decoders): New array.
(decode_ifaddrmsg): Use it.
---

diff --git a/rtnl_addr.c b/rtnl_addr.c
index c7e37eab..a05cfbed 100644
--- a/rtnl_addr.c
+++ b/rtnl_addr.c
@@ -42,6 +42,67 @@
 #include "xlat/routing_scopes.h"
 #include "xlat/rtnl_addr_attrs.h"
 
+static bool
+decode_ifa_address(struct tcb *const tcp,
+		   const kernel_ulong_t addr,
+		   const unsigned int len,
+		   const void *const opaque_data)
+{
+	const struct ifaddrmsg *const ifaddr = opaque_data;
+
+	decode_inet_addr(tcp, addr, len, ifaddr->ifa_family, NULL);
+
+	return true;
+}
+
+static bool
+decode_ifa_cacheinfo(struct tcb *const tcp,
+		     const kernel_ulong_t addr,
+		     const unsigned int len,
+		     const void *const opaque_data)
+{
+	struct ifa_cacheinfo ci;
+
+	if (len < sizeof(ci))
+		return false;
+	else if (!umove_or_printaddr(tcp, addr, &ci)) {
+		PRINT_FIELD_U("{", ci, ifa_prefered);
+		PRINT_FIELD_U(", ", ci, ifa_valid);
+		PRINT_FIELD_U(", ", ci, cstamp);
+		PRINT_FIELD_U(", ", ci, tstamp);
+		tprintf("}");
+	}
+
+	return true;
+}
+
+static bool
+decode_ifa_flags(struct tcb *const tcp,
+		 const kernel_ulong_t addr,
+		 const unsigned int len,
+		 const void *const opaque_data)
+{
+	uint32_t ifa_flags;
+
+	if (len < sizeof(ifa_flags))
+		return false;
+	else if (!umove_or_printaddr(tcp, addr, &ifa_flags))
+		printflags(ifaddrflags, ifa_flags, "IFA_F_???");
+
+	return true;
+}
+
+static const nla_decoder_t ifaddrmsg_nla_decoders[] = {
+	[IFA_ADDRESS]	= decode_ifa_address,
+	[IFA_LOCAL]	= decode_ifa_address,
+	[IFA_LABEL]	= decode_nla_str,
+	[IFA_BROADCAST]	= decode_ifa_address,
+	[IFA_ANYCAST]	= decode_ifa_address,
+	[IFA_CACHEINFO]	= decode_ifa_cacheinfo,
+	[IFA_MULTICAST]	= decode_ifa_address,
+	[IFA_FLAGS]	= decode_ifa_flags
+};
+
 DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
 {
 	struct ifaddrmsg ifaddr = { .ifa_family = family };
@@ -71,6 +132,8 @@ DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
 	if (decode_nla && len > offset) {
 		tprints(", ");
 		decode_nlattr(tcp, addr + offset, len - offset,
-			      rtnl_addr_attrs, "IFA_???", NULL, 0, NULL);
+			      rtnl_addr_attrs, "IFA_???",
+			      ifaddrmsg_nla_decoders,
+			      ARRAY_SIZE(ifaddrmsg_nla_decoders), &ifaddr);
 	}
 }