net: convert to nla_get_*_default()

Most of the original conversion is from the spatch below,
but I edited some and left out other instances that were
either buggy after conversion (where default values don't
fit into the type) or just looked strange.

    @@
    expression attr, def;
    expression val;
    identifier fn =~ "^nla_get_.*";
    fresh identifier dfn = fn ## "_default";
    @@
    (
    -if (attr)
    -  val = fn(attr);
    -else
    -  val = def;
    +val = dfn(attr, def);
    |
    -if (!attr)
    -  val = def;
    -else
    -  val = fn(attr);
    +val = dfn(attr, def);
    |
    -if (!attr)
    -  return def;
    -return fn(attr);
    +return dfn(attr, def);
    |
    -attr ? fn(attr) : def
    +dfn(attr, def)
    |
    -!attr ? def : fn(attr)
    +dfn(attr, def)
    )

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@kernel.org>
Link: https://patch.msgid.link/20241108114145.0580b8684e7f.I740beeaa2f70ebfc19bfca1045a24d6151992790@changeid
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 12 insertions, 20 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index f58f39a9ee87..c8b3cf5fba4c 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -926,8 +926,7 @@ static struct in_ifaddr *inet_rtm_to_ifa(struct net *net, struct nlmsghdr *nlh,
 
 	ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 	ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
-	ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
-					 ifm->ifa_flags;
+	ifa->ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
 	ifa->ifa_scope = ifm->ifa_scope;
 	ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
 	ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 99e7cd0531d9..c58dd78509a2 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2546,9 +2546,9 @@ static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		goto errout;
 
-	src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
-	grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
-	tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
+	src = nla_get_in_addr_default(tb[RTA_SRC], 0);
+	grp = nla_get_in_addr_default(tb[RTA_DST], 0);
+	tableid = nla_get_u32_default(tb[RTA_TABLE], 0);
 
 	mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
 	if (!mrt) {
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 570e450e008c..09a3d73b45ba 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -3247,12 +3247,8 @@ static int nh_valid_get_del_req(const struct nlmsghdr *nlh,
 		return -EINVAL;
 	}
 
-	if (op_flags) {
-		if (tb[NHA_OP_FLAGS])
-			*op_flags = nla_get_u32(tb[NHA_OP_FLAGS]);
-		else
-			*op_flags = 0;
-	}
+	if (op_flags)
+		*op_flags = nla_get_u32_default(tb[NHA_OP_FLAGS], 0);
 
 	return 0;
 }
@@ -3433,10 +3429,7 @@ static int nh_valid_dump_req(const struct nlmsghdr *nlh,
 	if (err < 0)
 		return err;
 
-	if (tb[NHA_OP_FLAGS])
-		filter->op_flags = nla_get_u32(tb[NHA_OP_FLAGS]);
-	else
-		filter->op_flags = 0;
+	filter->op_flags = nla_get_u32_default(tb[NHA_OP_FLAGS], 0);
 
 	return __nh_valid_dump_req(nlh, tb, filter, cb->extack);
 }
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 763398e08b7d..4c5e773002fe 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3231,10 +3231,10 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 		return err;
 
 	rtm = nlmsg_data(nlh);
-	src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
-	dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
-	iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
-	mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0;
+	src = nla_get_in_addr_default(tb[RTA_SRC], 0);
+	dst = nla_get_in_addr_default(tb[RTA_DST], 0);
+	iif = nla_get_u32_default(tb[RTA_IIF], 0);
+	mark = nla_get_u32_default(tb[RTA_MARK], 0);
 	if (tb[RTA_UID])
 		uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID]));
 	else
@@ -3260,7 +3260,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 	fl4.daddr = dst;
 	fl4.saddr = src;
 	fl4.flowi4_tos = rtm->rtm_tos & INET_DSCP_MASK;
-	fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0;
+	fl4.flowi4_oif = nla_get_u32_default(tb[RTA_OIF], 0);
 	fl4.flowi4_mark = mark;
 	fl4.flowi4_uid = uid;
 	if (sport)