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Message-Id: <20241024093348.353245-3-dongml2@chinatelecom.cn>
Date: Thu, 24 Oct 2024 17:33:41 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: pabeni@...hat.com
Cc: davem@...emloft.net,
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Subject: [PATCH bpf-next v4 2/9] net: ip: make ip_route_input_mc() return drop reason
Make ip_route_input_mc() return drop reason, and adjust the call of it
in ip_route_input_rcu().
Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
net/ipv4/route.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 3e7a3e947b7d..e579fe5bd3d3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1696,8 +1696,9 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
}
/* called in rcu_read_lock() section */
-static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
- dscp_t dscp, struct net_device *dev, int our)
+static enum skb_drop_reason
+ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+ dscp_t dscp, struct net_device *dev, int our)
{
struct in_device *in_dev = __in_dev_get_rcu(dev);
unsigned int flags = RTCF_MULTICAST;
@@ -1708,7 +1709,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
err = ip_mc_validate_source(skb, daddr, saddr, dscp, dev, in_dev,
&itag);
if (err)
- return err;
+ return SKB_DROP_REASON_NOT_SPECIFIED;
if (our)
flags |= RTCF_LOCAL;
@@ -1719,7 +1720,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST,
false);
if (!rth)
- return -ENOBUFS;
+ return SKB_DROP_REASON_NOMEM;
#ifdef CONFIG_IP_ROUTE_CLASSID
rth->dst.tclassid = itag;
@@ -1735,7 +1736,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
skb_dst_drop(skb);
skb_dst_set(skb, &rth->dst);
- return 0;
+ return SKB_NOT_DROPPED_YET;
}
@@ -2433,12 +2434,12 @@ static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
* route cache entry is created eventually.
*/
if (ipv4_is_multicast(daddr)) {
+ enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
struct in_device *in_dev = __in_dev_get_rcu(dev);
int our = 0;
- int err = -EINVAL;
if (!in_dev)
- return err;
+ return -EINVAL;
our = ip_check_mc_rcu(in_dev, daddr, saddr,
ip_hdr(skb)->protocol);
@@ -2459,10 +2460,10 @@ static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
IN_DEV_MFORWARD(in_dev))
#endif
) {
- err = ip_route_input_mc(skb, daddr, saddr, dscp, dev,
- our);
+ reason = ip_route_input_mc(skb, daddr, saddr, dscp,
+ dev, our);
}
- return err;
+ return reason ? -EINVAL : 0;
}
return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res);
--
2.39.5
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