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179 lines
6.3 KiB
Diff
179 lines
6.3 KiB
Diff
From: Richard Gobert <richardbgobert@gmail.com>
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Date: Tue, 30 Apr 2024 16:35:54 +0200
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Subject: [PATCH] net: gro: fix udp bad offset in socket lookup by adding
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{inner_}network_offset to napi_gro_cb
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Commits a602456 ("udp: Add GRO functions to UDP socket") and 57c67ff ("udp:
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additional GRO support") introduce incorrect usage of {ip,ipv6}_hdr in the
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complete phase of gro. The functions always return skb->network_header,
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which in the case of encapsulated packets at the gro complete phase, is
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always set to the innermost L3 of the packet. That means that calling
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{ip,ipv6}_hdr for skbs which completed the GRO receive phase (both in
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gro_list and *_gro_complete) when parsing an encapsulated packet's _outer_
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L3/L4 may return an unexpected value.
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This incorrect usage leads to a bug in GRO's UDP socket lookup.
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udp{4,6}_lib_lookup_skb functions use ip_hdr/ipv6_hdr respectively. These
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*_hdr functions return network_header which will point to the innermost L3,
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resulting in the wrong offset being used in __udp{4,6}_lib_lookup with
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encapsulated packets.
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This patch adds network_offset and inner_network_offset to napi_gro_cb, and
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makes sure both are set correctly.
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To fix the issue, network_offsets union is used inside napi_gro_cb, in
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which both the outer and the inner network offsets are saved.
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Reproduction example:
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Endpoint configuration example (fou + local address bind)
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# ip fou add port 6666 ipproto 4
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# ip link add name tun1 type ipip remote 2.2.2.1 local 2.2.2.2 encap fou encap-dport 5555 encap-sport 6666 mode ipip
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# ip link set tun1 up
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# ip a add 1.1.1.2/24 dev tun1
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Netperf TCP_STREAM result on net-next before patch is applied:
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net-next main, GRO enabled:
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$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
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Recv Send Send
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Socket Socket Message Elapsed
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Size Size Size Time Throughput
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bytes bytes bytes secs. 10^6bits/sec
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131072 16384 16384 5.28 2.37
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net-next main, GRO disabled:
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$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
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Recv Send Send
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Socket Socket Message Elapsed
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Size Size Size Time Throughput
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bytes bytes bytes secs. 10^6bits/sec
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131072 16384 16384 5.01 2745.06
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patch applied, GRO enabled:
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$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
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Recv Send Send
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Socket Socket Message Elapsed
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Size Size Size Time Throughput
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bytes bytes bytes secs. 10^6bits/sec
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131072 16384 16384 5.01 2877.38
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Fixes: a6024562ffd7 ("udp: Add GRO functions to UDP socket")
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Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
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Reviewed-by: Eric Dumazet <edumazet@google.com>
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Reviewed-by: Willem de Bruijn <willemb@google.com>
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Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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---
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--- a/include/net/gro.h
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+++ b/include/net/gro.h
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@@ -86,6 +86,15 @@ struct napi_gro_cb {
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/* used to support CHECKSUM_COMPLETE for tunneling protocols */
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__wsum csum;
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+
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+ /* L3 offsets */
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+ union {
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+ struct {
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+ u16 network_offset;
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+ u16 inner_network_offset;
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+ };
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+ u16 network_offsets[2];
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+ };
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};
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#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
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--- a/net/8021q/vlan_core.c
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+++ b/net/8021q/vlan_core.c
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@@ -478,6 +478,8 @@ static struct sk_buff *vlan_gro_receive(
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if (unlikely(!vhdr))
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goto out;
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+ NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = hlen;
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+
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type = vhdr->h_vlan_encapsulated_proto;
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ptype = gro_find_receive_by_type(type);
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--- a/net/core/gro.c
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+++ b/net/core/gro.c
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@@ -373,6 +373,7 @@ static inline void skb_gro_reset_offset(
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const struct skb_shared_info *pinfo = skb_shinfo(skb);
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const skb_frag_t *frag0 = &pinfo->frags[0];
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+ NAPI_GRO_CB(skb)->network_offset = 0;
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NAPI_GRO_CB(skb)->data_offset = 0;
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NAPI_GRO_CB(skb)->frag0 = NULL;
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NAPI_GRO_CB(skb)->frag0_len = 0;
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--- a/net/ipv4/af_inet.c
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+++ b/net/ipv4/af_inet.c
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@@ -1571,6 +1571,7 @@ struct sk_buff *inet_gro_receive(struct
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/* The above will be needed by the transport layer if there is one
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* immediately following this IP hdr.
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*/
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+ NAPI_GRO_CB(skb)->inner_network_offset = off;
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/* Note : No need to call skb_gro_postpull_rcsum() here,
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* as we already checked checksum over ipv4 header was 0
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--- a/net/ipv4/udp.c
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+++ b/net/ipv4/udp.c
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@@ -534,7 +534,8 @@ static inline struct sock *__udp4_lib_lo
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struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
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__be16 sport, __be16 dport)
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{
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- const struct iphdr *iph = ip_hdr(skb);
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+ const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
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+ const struct iphdr *iph = (struct iphdr *)(skb->data + offset);
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struct net *net = dev_net(skb->dev);
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int iif, sdif;
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--- a/net/ipv4/udp_offload.c
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+++ b/net/ipv4/udp_offload.c
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@@ -718,7 +718,8 @@ EXPORT_SYMBOL(udp_gro_complete);
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INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
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{
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- const struct iphdr *iph = ip_hdr(skb);
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+ const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
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+ const struct iphdr *iph = (struct iphdr *)(skb->data + offset);
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struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
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/* do fraglist only if there is no outer UDP encap (or we already processed it) */
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--- a/net/ipv6/ip6_offload.c
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+++ b/net/ipv6/ip6_offload.c
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@@ -240,6 +240,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *
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goto out;
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skb_set_network_header(skb, off);
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+ NAPI_GRO_CB(skb)->inner_network_offset = off;
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flush += ntohs(iph->payload_len) != skb->len - hlen;
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--- a/net/ipv6/udp.c
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+++ b/net/ipv6/udp.c
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@@ -275,7 +275,8 @@ static struct sock *__udp6_lib_lookup_sk
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struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
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__be16 sport, __be16 dport)
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{
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- const struct ipv6hdr *iph = ipv6_hdr(skb);
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+ const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
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+ const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset);
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struct net *net = dev_net(skb->dev);
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int iif, sdif;
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--- a/net/ipv6/udp_offload.c
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+++ b/net/ipv6/udp_offload.c
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@@ -164,7 +164,8 @@ flush:
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INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
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{
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- const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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+ const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
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+ const struct ipv6hdr *ipv6h = (struct ipv6hdr *)(skb->data + offset);
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struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
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/* do fraglist only if there is no outer UDP encap (or we already processed it) */
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