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charset="utf-8" In this commit, we make ip_route_input_noref() return drop reasons, which come from ip_route_input_rcu(). We need adjust the callers of ip_route_input_noref() to make sure the return value of ip_route_input_noref() is used properly. The errno that ip_route_input_noref() returns in the origin logic is returned by ip_route_input and bpf_lwt_input_reroute, and we make them return -EINVAL on error instead. In the following patch, we will make ip_route_input() returns drop reasons too. Signed-off-by: Menglong Dong --- include/net/route.h | 15 ++++++++------- net/core/lwt_bpf.c | 1 + net/ipv4/ip_fragment.c | 12 +++++++----- net/ipv4/ip_input.c | 7 ++++--- net/ipv4/route.c | 7 ++++--- 5 files changed, 24 insertions(+), 18 deletions(-) diff --git a/include/net/route.h b/include/net/route.h index 35bc12146960..c0b1b5fb9b59 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -202,8 +202,9 @@ enum skb_drop_reason 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 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev); +enum skb_drop_reason +ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev); int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src, u8 tos, struct net_device *devin, const struct sk_buff *hint); @@ -211,18 +212,18 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 dst= , __be32 src, static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 s= rc, dscp_t dscp, struct net_device *devin) { - int err; + enum skb_drop_reason reason; =20 rcu_read_lock(); - err =3D ip_route_input_noref(skb, dst, src, dscp, devin); - if (!err) { + reason =3D ip_route_input_noref(skb, dst, src, dscp, devin); + if (!reason) { skb_dst_force(skb); if (!skb_dst(skb)) - err =3D -EINVAL; + reason =3D SKB_DROP_REASON_NOT_SPECIFIED; } rcu_read_unlock(); =20 - return err; + return reason ? -EINVAL : 0; } =20 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int o= if, diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c index e0ca24a58810..a4652f2a103a 100644 --- a/net/core/lwt_bpf.c +++ b/net/core/lwt_bpf.c @@ -98,6 +98,7 @@ static int bpf_lwt_input_reroute(struct sk_buff *skb) skb_dst_drop(skb); err =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, ip4h_dscp(iph), dev); + err =3D err ? -EINVAL : 0; dev_put(dev); } else if (skb->protocol =3D=3D htons(ETH_P_IPV6)) { skb_dst_drop(skb); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 48e2810f1f27..52b991e976ba 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -132,12 +132,12 @@ static bool frag_expire_skip_icmp(u32 user) */ static void ip_expire(struct timer_list *t) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_FRAG_REASM_TIMEOUT; struct inet_frag_queue *frag =3D from_timer(frag, t, timer); const struct iphdr *iph; struct sk_buff *head =3D NULL; struct net *net; struct ipq *qp; - int err; =20 qp =3D container_of(frag, struct ipq, q); net =3D qp->q.fqdir->net; @@ -175,10 +175,12 @@ static void ip_expire(struct timer_list *t) =20 /* skb has no dst, perform route lookup again */ iph =3D ip_hdr(head); - err =3D ip_route_input_noref(head, iph->daddr, iph->saddr, ip4h_dscp(iph), - head->dev); - if (err) + reason =3D ip_route_input_noref(head, iph->daddr, iph->saddr, + ip4h_dscp(iph), head->dev); + if (reason) goto out; + else + reason =3D SKB_DROP_REASON_FRAG_REASM_TIMEOUT; =20 /* Only an end host needs to send an ICMP * "Fragment Reassembly Timeout" message, per RFC792. @@ -195,7 +197,7 @@ static void ip_expire(struct timer_list *t) spin_unlock(&qp->q.lock); out_rcu_unlock: rcu_read_unlock(); - kfree_skb_reason(head, SKB_DROP_REASON_FRAG_REASM_TIMEOUT); + kfree_skb_reason(head, reason); ipq_put(qp); } =20 diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index a6f5bfc274ee..aeb71675052c 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -362,10 +362,11 @@ static int ip_rcv_finish_core(struct net *net, struct= sock *sk, * how the packet travels inside Linux networking. */ if (!skb_valid_dst(skb)) { - err =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, - ip4h_dscp(iph), dev); - if (unlikely(err)) + drop_reason =3D ip_route_input_noref(skb, iph->daddr, iph->saddr, + ip4h_dscp(iph), dev); + if (unlikely(drop_reason)) goto drop_error; + drop_reason =3D SKB_DROP_REASON_NOT_SPECIFIED; } else { struct in_device *in_dev =3D __in_dev_get_rcu(dev); =20 diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 56a1ebddde24..6baaaf0bcb3e 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2492,8 +2492,9 @@ ip_route_input_rcu(struct sk_buff *skb, __be32 daddr,= __be32 saddr, return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res); } =20 -int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, - dscp_t dscp, struct net_device *dev) +enum skb_drop_reason ip_route_input_noref(struct sk_buff *skb, __be32 dadd= r, + __be32 saddr, dscp_t dscp, + struct net_device *dev) { enum skb_drop_reason reason; struct fib_result res; @@ -2502,7 +2503,7 @@ int ip_route_input_noref(struct sk_buff *skb, __be32 = daddr, __be32 saddr, reason =3D ip_route_input_rcu(skb, daddr, saddr, dscp, dev, &res); rcu_read_unlock(); =20 - return reason ? -EINVAL : 0; + return reason; } EXPORT_SYMBOL(ip_route_input_noref); =20 --=20 2.39.5