diff mbox series

[net-next,v5,5/9] net: ip: make ip_route_input_rcu() return drop reasons

Message ID 20241107125601.1076814-6-dongml2@chinatelecom.cn (mailing list archive)
State Accepted
Commit 61b95c70f3449c1c0bd1415c8ef37e2959cf1c41
Delegated to: Netdev Maintainers
Headers show
Series net: ip: add drop reasons to input route | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 3 this patch: 3
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4 this patch: 4
netdev/checkpatch warning WARNING: From:/Signed-off-by: email address mismatch: 'From: Menglong Dong <menglong8.dong@gmail.com>' != 'Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>'
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-11-11--21-00 (tests: 787)

Commit Message

Menglong Dong Nov. 7, 2024, 12:55 p.m. UTC 
In this commit, we make ip_route_input_rcu() return drop reasons, which
come from ip_route_input_mc() and ip_route_input_slow().

The only caller of ip_route_input_rcu() is ip_route_input_noref(). We
adjust it by making it return -EINVAL on error and ignore the reasons that
ip_route_input_rcu() returns. In the following patch, we will make
ip_route_input_noref() returns the drop reasons.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
---
v4:
- collapse the 2 lines that we modify in inet_rtm_getroute()
---
 net/ipv4/route.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1c4727504909..1926a8a1a83a 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2435,9 +2435,10 @@  ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 }
 
 /* called with rcu_read_lock held */
-static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
-			      dscp_t dscp, struct net_device *dev,
-			      struct fib_result *res)
+static enum skb_drop_reason
+ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+		   dscp_t dscp, struct net_device *dev,
+		   struct fib_result *res)
 {
 	/* Multicast recognition logic is moved from route cache to here.
 	 * The problem was that too many Ethernet cards have broken/missing
@@ -2480,23 +2481,23 @@  static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 			reason = ip_route_input_mc(skb, daddr, saddr, dscp,
 						   dev, our);
 		}
-		return reason ? -EINVAL : 0;
+		return reason;
 	}
 
-	return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res) ? -EINVAL : 0;
+	return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res);
 }
 
 int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 			 dscp_t dscp, struct net_device *dev)
 {
+	enum skb_drop_reason reason;
 	struct fib_result res;
-	int err;
 
 	rcu_read_lock();
-	err = ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res);
+	reason = ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res);
 	rcu_read_unlock();
 
-	return err;
+	return reason ? -EINVAL : 0;
 }
 EXPORT_SYMBOL(ip_route_input_noref);
 
@@ -3308,7 +3309,7 @@  static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 		skb->mark	= mark;
 		err = ip_route_input_rcu(skb, dst, src,
 					 inet_dsfield_to_dscp(rtm->rtm_tos),
-					 dev, &res);
+					 dev, &res) ? -EINVAL : 0;
 
 		rt = skb_rtable(skb);
 		if (err == 0 && rt->dst.error)