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Message-Id: <20241001060005.418231-2-dongml2@chinatelecom.cn>
Date: Tue, 1 Oct 2024 13:59:59 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: edumazet@...gle.com,
atenart@...nel.org
Cc: davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
dsahern@...nel.org,
steffen.klassert@...unet.com,
herbert@...dor.apana.org.au,
dongml2@...natelecom.cn,
bigeasy@...utronix.de,
toke@...hat.com,
idosch@...dia.com,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
bpf@...r.kernel.org
Subject: [PATCH net-next 1/7] net: ip: add drop reason to ip_route_input_noref()
The errno which ip_route_input_noref() returns can be used and checked by
the caller, so it's complex to make ip_route_input_noref() return drop
reason.
Instead, we add the pointer of the skb drop reason to the function
arguments of ip_route_input_noref, and adjust all the callers of it.
Then, we can pass the skb drop reasons to the caller.
Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
drivers/net/ipvlan/ipvlan_l3s.c | 2 +-
include/net/route.h | 5 +++--
net/core/lwt_bpf.c | 2 +-
net/ipv4/arp.c | 2 +-
net/ipv4/ip_fragment.c | 2 +-
net/ipv4/ip_input.c | 7 +++----
net/ipv4/route.c | 3 ++-
net/ipv4/xfrm4_input.c | 2 +-
net/ipv4/xfrm4_protocol.c | 2 +-
9 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ipvlan/ipvlan_l3s.c b/drivers/net/ipvlan/ipvlan_l3s.c
index d5b05e803219..fbfdd8c00056 100644
--- a/drivers/net/ipvlan/ipvlan_l3s.c
+++ b/drivers/net/ipvlan/ipvlan_l3s.c
@@ -52,7 +52,7 @@ static struct sk_buff *ipvlan_l3_rcv(struct net_device *dev,
int err;
err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
- ip4h->tos, sdev);
+ ip4h->tos, sdev, NULL);
if (unlikely(err))
goto out;
break;
diff --git a/include/net/route.h b/include/net/route.h
index 1789f1e6640b..cb9f31080517 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -202,7 +202,8 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
u8 tos, struct net_device *dev,
struct in_device *in_dev, u32 *itag);
int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
- u8 tos, struct net_device *devin);
+ u8 tos, struct net_device *devin,
+ enum skb_drop_reason *reason);
int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
u8 tos, struct net_device *devin,
const struct sk_buff *hint);
@@ -213,7 +214,7 @@ static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
int err;
rcu_read_lock();
- err = ip_route_input_noref(skb, dst, src, tos, devin);
+ err = ip_route_input_noref(skb, dst, src, tos, devin, NULL);
if (!err) {
skb_dst_force(skb);
if (!skb_dst(skb))
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index 1a14f915b7a4..df50f2977c90 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -96,7 +96,7 @@ static int bpf_lwt_input_reroute(struct sk_buff *skb)
dev_hold(dev);
skb_dst_drop(skb);
err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, dev);
+ iph->tos, dev, NULL);
dev_put(dev);
} else if (skb->protocol == htons(ETH_P_IPV6)) {
skb_dst_drop(skb);
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 11c1519b3699..a9dac0ef2be6 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -835,7 +835,7 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
}
if (arp->ar_op == htons(ARPOP_REQUEST) &&
- ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
+ ip_route_input_noref(skb, tip, sip, 0, dev, NULL) == 0) {
rt = skb_rtable(skb);
addr_type = rt->rt_type;
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index a92664a5ef2e..cdc75cfc1826 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -176,7 +176,7 @@ static void ip_expire(struct timer_list *t)
/* skb has no dst, perform route lookup again */
iph = ip_hdr(head);
err = ip_route_input_noref(head, iph->daddr, iph->saddr,
- iph->tos, head->dev);
+ iph->tos, head->dev, NULL);
if (err)
goto out;
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index b6e7d4921309..dc062ae49137 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -318,12 +318,11 @@ static int ip_rcv_finish_core(struct net *net, struct sock *sk,
struct sk_buff *skb, struct net_device *dev,
const struct sk_buff *hint)
{
+ enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
const struct iphdr *iph = ip_hdr(skb);
- int err, drop_reason;
+ int err;
struct rtable *rt;
- drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
-
if (ip_can_use_hint(skb, iph, hint)) {
err = ip_route_use_hint(skb, iph->daddr, iph->saddr, iph->tos,
dev, hint);
@@ -363,7 +362,7 @@ static int ip_rcv_finish_core(struct net *net, struct sock *sk,
*/
if (!skb_valid_dst(skb)) {
err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, dev);
+ iph->tos, dev, &drop_reason);
if (unlikely(err))
goto drop_error;
} else {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 723ac9181558..f1767e0cc9d9 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2465,7 +2465,8 @@ static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr,
}
int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr,
- u8 tos, struct net_device *dev)
+ u8 tos, struct net_device *dev,
+ enum skb_drop_reason *reason)
{
struct fib_result res;
int err;
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index a620618cc568..14990cc30c68 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -33,7 +33,7 @@ static inline int xfrm4_rcv_encap_finish(struct net *net, struct sock *sk,
const struct iphdr *iph = ip_hdr(skb);
if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, skb->dev))
+ iph->tos, skb->dev, NULL))
goto drop;
}
diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
index b146ce88c5d0..9678ff876169 100644
--- a/net/ipv4/xfrm4_protocol.c
+++ b/net/ipv4/xfrm4_protocol.c
@@ -76,7 +76,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
const struct iphdr *iph = ip_hdr(skb);
if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, skb->dev))
+ iph->tos, skb->dev, NULL))
goto drop;
}
--
2.39.5
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