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net: ip: make ip_route_input() return drop reasons

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In this commit, we make ip_route_input() return skb drop reasons that come
from ip_route_input_noref().

Meanwhile, adjust all the call to it.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Menglong Dong 2024-11-07 20:55:59 +08:00 committed by Paolo Abeni
parent 82d9983ebe
commit 50038bf38e
5 changed files with 19 additions and 17 deletions
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7
include/net/route.h
View File

@ -210,8 +210,9 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr,
dscp_t dscp, struct net_device *dev,
const struct sk_buff *hint);
static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
dscp_t dscp, struct net_device *devin)
static inline enum skb_drop_reason
ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, dscp_t dscp,
struct net_device *devin)
{
enum skb_drop_reason reason;
@ -224,7 +225,7 @@ static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
}
rcu_read_unlock();
return reason ? -EINVAL : 0;
return reason;
}
void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,

11
net/bridge/br_netfilter_hooks.c
View File

@ -373,8 +373,8 @@ static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
struct net_device *dev = skb->dev, *br_indev;
const struct iphdr *iph = ip_hdr(skb);
enum skb_drop_reason reason;
struct rtable *rt;
int err;
br_indev = nf_bridge_get_physindev(skb, net);
if (!br_indev) {
@ -390,9 +390,9 @@ static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_
}
nf_bridge->in_prerouting = 0;
if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) {
err = ip_route_input(skb, iph->daddr, iph->saddr,
ip4h_dscp(iph), dev);
if (err) {
reason = ip_route_input(skb, iph->daddr, iph->saddr,
ip4h_dscp(iph), dev);
if (reason) {
struct in_device *in_dev = __in_dev_get_rcu(dev);
/* If err equals -EHOSTUNREACH the error is due to a
@ -402,7 +402,8 @@ static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_
* martian destinations: loopback destinations and destination
* 0.0.0.0. In both cases the packet will be dropped because the
* destination is the loopback device and not the bridge. */
if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev))
if (reason != SKB_DROP_REASON_IP_INADDRERRORS || !in_dev ||
IN_DEV_FORWARD(in_dev))
goto free_skb;
rt = ip_route_output(net, iph->daddr, 0,

2
net/ipv4/icmp.c
View File

@ -545,7 +545,7 @@ static struct rtable *icmp_route_lookup(struct net *net, struct flowi4 *fl4,
orefdst = skb_in->_skb_refdst; /* save old refdst */
skb_dst_set(skb_in, NULL);
err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
dscp, rt2->dst.dev);
dscp, rt2->dst.dev) ? -EINVAL : 0;
dst_release(&rt2->dst);
rt2 = skb_rtable(skb_in);

2
net/ipv4/ip_options.c
View File

@ -618,7 +618,7 @@ int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev)
orefdst = skb->_skb_refdst;
skb_dst_set(skb, NULL);
err = ip_route_input(skb, nexthop, iph->saddr, ip4h_dscp(iph),
dev);
dev) ? -EINVAL : 0;
rt2 = skb_rtable(skb);
if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) {
skb_dst_drop(skb);

14
net/ipv6/seg6_local.c
View File

@ -954,10 +954,10 @@ static int input_action_end_dx4_finish(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
struct dst_entry *orig_dst = skb_dst(skb);
enum skb_drop_reason reason;
struct seg6_local_lwt *slwt;
struct iphdr *iph;
__be32 nhaddr;
int err;
slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
@ -967,9 +967,9 @@ static int input_action_end_dx4_finish(struct net *net, struct sock *sk,
skb_dst_drop(skb);
err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
if (err) {
kfree_skb(skb);
reason = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
if (reason) {
kfree_skb_reason(skb, reason);
return -EINVAL;
}
@ -1174,8 +1174,8 @@ drop:
static int input_action_end_dt4(struct sk_buff *skb,
struct seg6_local_lwt *slwt)
{
enum skb_drop_reason reason;
struct iphdr *iph;
int err;
if (!decap_and_validate(skb, IPPROTO_IPIP))
goto drop;
@ -1193,8 +1193,8 @@ static int input_action_end_dt4(struct sk_buff *skb,
iph = ip_hdr(skb);
err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev);
if (unlikely(err))
reason = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev);
if (unlikely(reason))
goto drop;
return dst_input(skb);