[PATCH net-next v3 1/4] net: gro: add p_off param in *_gro_complete

From: Richard Gobert
Date: Sat Mar 09 2024 - 10:29:34 EST

Commits a602456 ("udp: Add GRO functions to UDP socket") and 57c67ff ("udp:
additional GRO support") introduce incorrect usage of {ip,ipv6}_hdr in the
complete phase of gro. The functions always return skb->network_header,
which in the case of encapsulated packets at the gro complete phase, is
always set to the innermost L3 of the packet. That means that calling
{ip,ipv6}_hdr for skbs which completed the GRO receive phase (both in
gro_list and *_gro_complete) when parsing an encapsulated packet's _outer_
L3/L4 may return an unexpected value.

This incorrect usage leads to a bug in GRO's UDP socket lookup.
udp{4,6}_lib_lookup_skb functions use ip_hdr/ipv6_hdr respectively. These
*_hdr functions return network_header which will point to the innermost L3,
resulting in the wrong offset being used in __udp{4,6}_lib_lookup with
encapsulated packets.

To fix this issue p_off param is used in *_gro_complete to pass off the
offset of the previous layer.

Reproduction example:

Endpoint configuration example (fou + local address bind)

# ip fou add port 6666 ipproto 4
# 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
# ip link set tun1 up
# ip a add 1.1.1.2/24 dev tun1

Netperf TCP_STREAM result on net-next before patch is applied:

net-next main, GRO enabled:
$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

131072 16384 16384 5.28 2.37

net-next main, GRO disabled:
$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

131072 16384 16384 5.01 2745.06

patch applied, GRO enabled:
$ netperf -H 1.1.1.2 -t TCP_STREAM -l 5
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

131072 16384 16384 5.01 2877.38

Fixes: 57c67ff4bd92 ("udp: additional GRO support")
Suggested-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Richard Gobert <richardbgobert@xxxxxxxxx>
---
drivers/net/geneve.c | 7 ++++---
drivers/net/vxlan/vxlan_core.c | 11 +++++++----
include/linux/etherdevice.h | 2 +-
include/linux/netdevice.h | 3 ++-
include/linux/udp.h | 2 +-
include/net/gro.h | 11 ++++++-----
include/net/inet_common.h | 2 +-
include/net/tcp.h | 6 ++++--
include/net/udp.h | 8 ++++----
include/net/udp_tunnel.h | 2 +-
net/8021q/vlan_core.c | 4 ++--
net/core/gro.c | 2 +-
net/ethernet/eth.c | 4 ++--
net/ipv4/af_inet.c | 8 ++++----
net/ipv4/fou_core.c | 9 +++++----
net/ipv4/gre_offload.c | 5 +++--
net/ipv4/tcp_offload.c | 7 ++++---
net/ipv4/udp.c | 3 ++-
net/ipv4/udp_offload.c | 26 ++++++++++++++------------
net/ipv6/ip6_offload.c | 22 ++++++++++++----------
net/ipv6/tcpv6_offload.c | 7 ++++---
net/ipv6/udp.c | 3 ++-
net/ipv6/udp_offload.c | 13 +++++++------
23 files changed, 93 insertions(+), 74 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index e25e0a31126c..75837b3fb2d3 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -546,7 +546,7 @@ static struct sk_buff *geneve_gro_receive(struct sock *sk,
}

static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
- int nhoff)
+ int p_off, int nhoff)
{
struct genevehdr *gh;
struct packet_offload *ptype;
@@ -560,11 +560,12 @@ static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,

/* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
if (likely(type == htons(ETH_P_TEB)))
- return eth_gro_complete(skb, nhoff + gh_len);
+ return eth_gro_complete(skb, p_off, nhoff + gh_len);

ptype = gro_find_complete_by_type(type);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
+ err = ptype->callbacks.gro_complete(skb, p_off,
+ nhoff + gh_len);

skb_set_inner_mac_header(skb, nhoff + gh_len);

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 386cbe4d3327..84c123405b70 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -767,15 +767,17 @@ static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk,
return pp;
}

-static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
/* Sets 'skb->inner_mac_header' since we are always called with
* 'skb->encapsulation' set.
*/
- return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+ return eth_gro_complete(skb, p_off, nhoff + sizeof(struct vxlanhdr));
}

-static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff);
const struct packet_offload *ptype;
@@ -786,7 +788,8 @@ static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhof
return err;
ptype = gro_find_complete_by_type(protocol);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+ err = ptype->callbacks.gro_complete(skb, p_off, nhoff +
+ sizeof(struct vxlanhdr));
return err;
}

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 224645f17c33..b081b43d9686 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -64,7 +64,7 @@ struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
#define devm_alloc_etherdev(dev, sizeof_priv) devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1)

struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb);
-int eth_gro_complete(struct sk_buff *skb, int nhoff);
+int eth_gro_complete(struct sk_buff *skb, int p_off, int nhoff);

/* Reserved Ethernet Addresses per IEEE 802.1Q */
static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c41019f34179..5a7049f83e41 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2788,7 +2788,8 @@ struct offload_callbacks {
netdev_features_t features);
struct sk_buff *(*gro_receive)(struct list_head *head,
struct sk_buff *skb);
- int (*gro_complete)(struct sk_buff *skb, int nhoff);
+ int (*gro_complete)(struct sk_buff *skb, int nhoff,
+ int thoff);
};

struct packet_offload {
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 3748e82b627b..a04d94a3b42f 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -82,7 +82,7 @@ struct udp_sock {
struct sk_buff *skb);
int (*gro_complete)(struct sock *sk,
struct sk_buff *skb,
- int nhoff);
+ int nhoff, int thoff);

/* udp_recvmsg try to use this before splicing sk_receive_queue */
struct sk_buff_head reader_queue ____cacheline_aligned_in_smp;
diff --git a/include/net/gro.h b/include/net/gro.h
index 2b58671a6549..cb7282bf3d63 100644
--- a/include/net/gro.h
+++ b/include/net/gro.h
@@ -382,18 +382,18 @@ static inline void skb_gro_flush_final_remcsum(struct sk_buff *skb,

INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int, int));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int, int));

INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int, int));

INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp6_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int, int));

#define indirect_call_gro_receive_inet(cb, f2, f1, head, skb) \
({ \
@@ -404,7 +404,8 @@ INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int));

struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
struct udphdr *uh, struct sock *sk);
-int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
+int udp_gro_complete(struct sk_buff *skb, int nhoff, int thoff,
+ udp_lookup_t lookup);

static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
{
diff --git a/include/net/inet_common.h b/include/net/inet_common.h
index f50a644d87a9..605f917c830c 100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -64,7 +64,7 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len,
int *addr_len);

struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb);
-int inet_gro_complete(struct sk_buff *skb, int nhoff);
+int inet_gro_complete(struct sk_buff *skb, int nhoff, int thoff);
struct sk_buff *inet_gso_segment(struct sk_buff *skb,
netdev_features_t features);

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6ae35199d3b3..f36f15b6fb49 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2196,9 +2196,11 @@ void tcp_v4_destroy_sock(struct sock *sk);
struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
netdev_features_t features);
struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb);
-INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *skb, int thoff));
+INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *skb, int nhoff,
+ int thoff));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb));
-INDIRECT_CALLABLE_DECLARE(int tcp6_gro_complete(struct sk_buff *skb, int thoff));
+INDIRECT_CALLABLE_DECLARE(int tcp6_gro_complete(struct sk_buff *skb, int nhoff,
+ int thoff));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb));
#ifdef CONFIG_INET
void tcp_gro_complete(struct sk_buff *skb);
diff --git a/include/net/udp.h b/include/net/udp.h
index 488a6d2babcc..601d1c3b677a 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -166,8 +166,8 @@ static inline void udp_csum_pull_header(struct sk_buff *skb)
UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
}

-typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport,
- __be16 dport);
+typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, int nhoff,
+ __be16 sport, __be16 dport);

void udp_v6_early_demux(struct sk_buff *skb);
INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *));
@@ -301,7 +301,7 @@ struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
__be32 daddr, __be16 dport, int dif, int sdif,
struct udp_table *tbl, struct sk_buff *skb);
-struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
+struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb, int nhoff,
__be16 sport, __be16 dport);
struct sock *udp6_lib_lookup(struct net *net,
const struct in6_addr *saddr, __be16 sport,
@@ -312,7 +312,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
const struct in6_addr *daddr, __be16 dport,
int dif, int sdif, struct udp_table *tbl,
struct sk_buff *skb);
-struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
+struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, int nhoff,
__be16 sport, __be16 dport);
int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor);

diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
index d716214fe03d..a641392e70b0 100644
--- a/include/net/udp_tunnel.h
+++ b/include/net/udp_tunnel.h
@@ -75,7 +75,7 @@ typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk,
struct list_head *head,
struct sk_buff *skb);
typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
- int nhoff);
+ int nhoff, int thoff);

struct udp_tunnel_sock_cfg {
void *sk_user_data; /* user data used by encap_rcv call back */
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index f00158234505..247704cf70af 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -510,7 +510,7 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
return pp;
}

-static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
+static int vlan_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
__be16 type = vhdr->h_vlan_encapsulated_proto;
@@ -521,7 +521,7 @@ static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
if (ptype)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, nhoff + sizeof(*vhdr));
+ skb, p_off, nhoff + sizeof(*vhdr));

return err;
}
diff --git a/net/core/gro.c b/net/core/gro.c
index 6a0edbd826a1..7da3df2c634f 100644
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -254,7 +254,7 @@ static void napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb)

err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, 0);
+ skb, 0, 0);
break;
}
rcu_read_unlock();
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 2edc8b796a4e..7515e6bcbb7d 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -453,7 +453,7 @@ struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
}
EXPORT_SYMBOL(eth_gro_receive);

-int eth_gro_complete(struct sk_buff *skb, int nhoff)
+int eth_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
__be16 type = eh->h_proto;
@@ -467,7 +467,7 @@ int eth_gro_complete(struct sk_buff *skb, int nhoff)
if (ptype != NULL)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, nhoff + sizeof(*eh));
+ skb, p_off, nhoff + sizeof(*eh));

return err;
}
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 5daebdcbca32..9334b563a88b 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1640,7 +1640,7 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
}
EXPORT_SYMBOL(inet_recv_error);

-int inet_gro_complete(struct sk_buff *skb, int nhoff)
+int inet_gro_complete(struct sk_buff *skb, int prior_off, int nhoff)
{
struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
const struct net_offload *ops;
@@ -1666,17 +1666,17 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
*/
err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
tcp4_gro_complete, udp4_gro_complete,
- skb, nhoff + sizeof(*iph));
+ skb, nhoff, nhoff + sizeof(*iph));

out:
return err;
}

-static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
+static int ipip_gro_complete(struct sk_buff *skb, int prior_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
- return inet_gro_complete(skb, nhoff);
+ return inet_gro_complete(skb, prior_off, nhoff);
}

int inet_ctl_sock_create(struct sock **sk, unsigned short family,
diff --git a/net/ipv4/fou_core.c b/net/ipv4/fou_core.c
index a8494f796dca..7cf214d0b96d 100644
--- a/net/ipv4/fou_core.c
+++ b/net/ipv4/fou_core.c
@@ -260,7 +260,7 @@ static struct sk_buff *fou_gro_receive(struct sock *sk,
}

static int fou_gro_complete(struct sock *sk, struct sk_buff *skb,
- int nhoff)
+ int p_off, int nhoff)
{
const struct net_offload __rcu **offloads;
u8 proto = fou_from_sock(sk)->protocol;
@@ -272,7 +272,7 @@ static int fou_gro_complete(struct sock *sk, struct sk_buff *skb,
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out;

- err = ops->callbacks.gro_complete(skb, nhoff);
+ err = ops->callbacks.gro_complete(skb, p_off, nhoff);

skb_set_inner_mac_header(skb, nhoff);

@@ -445,7 +445,8 @@ static struct sk_buff *gue_gro_receive(struct sock *sk,
return pp;
}

-static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+static int gue_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff);
const struct net_offload __rcu **offloads;
@@ -480,7 +481,7 @@ static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out;

- err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
+ err = ops->callbacks.gro_complete(skb, p_off, nhoff + guehlen);

skb_set_inner_mac_header(skb, nhoff + guehlen);

diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 5028c72d494a..d4520c3f7c09 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -233,7 +233,7 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
return pp;
}

-static int gre_gro_complete(struct sk_buff *skb, int nhoff)
+static int gre_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct gre_base_hdr *greh = (struct gre_base_hdr *)(skb->data + nhoff);
struct packet_offload *ptype;
@@ -253,7 +253,8 @@ static int gre_gro_complete(struct sk_buff *skb, int nhoff)

ptype = gro_find_complete_by_type(type);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + grehlen);
+ err = ptype->callbacks.gro_complete(skb, p_off,
+ nhoff + grehlen);

skb_set_inner_mac_header(skb, nhoff + grehlen);

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index b955ab3b236d..fde800179b2e 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -330,10 +330,11 @@ struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
return tcp_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
+INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int nhoff,
+ int thoff)
{
- const struct iphdr *iph = ip_hdr(skb);
- struct tcphdr *th = tcp_hdr(skb);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
+ struct tcphdr *th = (struct tcphdr *)(skb->data + thoff);

th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a8acea17b4e5..70a6d174855f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -532,9 +532,10 @@ static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
}

struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
+ int nhoff,
__be16 sport, __be16 dport)
{
- const struct iphdr *iph = ip_hdr(skb);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
struct net *net = dev_net(skb->dev);
int iif, sdif;

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6c95d28d0c4a..cba615d52300 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -669,18 +669,19 @@ static int udp_gro_complete_segment(struct sk_buff *skb)
return 0;
}

-int udp_gro_complete(struct sk_buff *skb, int nhoff,
+int udp_gro_complete(struct sk_buff *skb, int nhoff, int thoff,
udp_lookup_t lookup)
{
- __be16 newlen = htons(skb->len - nhoff);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);
+ __be16 newlen = htons(skb->len - thoff);
struct sock *sk;
int err;

uh->len = newlen;

sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
- udp4_lib_lookup_skb, skb, uh->source, uh->dest);
+ udp4_lib_lookup_skb, skb, nhoff, uh->source,
+ uh->dest);
if (sk && udp_sk(sk)->gro_complete) {
skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM
: SKB_GSO_UDP_TUNNEL;
@@ -694,8 +695,8 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
* functions to make them set up the inner offsets.
*/
skb->encapsulation = 1;
- err = udp_sk(sk)->gro_complete(sk, skb,
- nhoff + sizeof(struct udphdr));
+ err = udp_sk(sk)->gro_complete(sk, skb, nhoff,
+ thoff + sizeof(struct udphdr));
} else {
err = udp_gro_complete_segment(skb);
}
@@ -707,14 +708,15 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
}
EXPORT_SYMBOL(udp_gro_complete);

-INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff,
+ int thoff)
{
- const struct iphdr *iph = ip_hdr(skb);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);

/* do fraglist only if there is no outer UDP encap (or we already processed it) */
if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) {
- uh->len = htons(skb->len - nhoff);
+ uh->len = htons(skb->len - thoff);

skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
@@ -731,10 +733,10 @@ INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
}

if (uh->check)
- uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
+ uh->check = ~udp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);

- return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
+ return udp_gro_complete(skb, nhoff, thoff, udp4_lib_lookup_skb);
}

static const struct net_offload udpv4_offload = {
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index cca64c7809be..e3a05b84c76a 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -346,12 +346,14 @@ static struct sk_buff *ip4ip6_gro_receive(struct list_head *head,
return inet_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb,
+ int p_off, int nhoff)
{
const struct net_offload *ops;
struct ipv6hdr *iph;
int err = -ENOSYS;
u32 payload_len;
+ int nhlen;

if (skb->encapsulation) {
skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6));
@@ -387,36 +389,36 @@ INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
iph->payload_len = htons(payload_len);
}

- nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
- if (WARN_ON(!ops || !ops->callbacks.gro_complete))
+ nhlen = sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
+ if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_complete))
goto out;

err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete,
- udp6_gro_complete, skb, nhoff);
+ udp6_gro_complete, skb, nhoff, nhoff + nhlen);

out:
return err;
}

-static int sit_gro_complete(struct sk_buff *skb, int nhoff)
+static int sit_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
- return ipv6_gro_complete(skb, nhoff);
+ return ipv6_gro_complete(skb, p_off, nhoff);
}

-static int ip6ip6_gro_complete(struct sk_buff *skb, int nhoff)
+static int ip6ip6_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
- return ipv6_gro_complete(skb, nhoff);
+ return ipv6_gro_complete(skb, p_off, nhoff);
}

-static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff)
+static int ip4ip6_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
- return inet_gro_complete(skb, nhoff);
+ return inet_gro_complete(skb, p_off, nhoff);
}

static struct packet_offload ipv6_packet_offload __read_mostly = {
diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
index bf0c957e4b5e..5043d2ff34eb 100644
--- a/net/ipv6/tcpv6_offload.c
+++ b/net/ipv6/tcpv6_offload.c
@@ -27,10 +27,11 @@ struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
return tcp_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
+INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb,
+ int nhoff, int thoff)
{
- const struct ipv6hdr *iph = ipv6_hdr(skb);
- struct tcphdr *th = tcp_hdr(skb);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)(skb->data + nhoff);
+ struct tcphdr *th = (struct tcphdr *)(skb->data + thoff);

th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
&iph->daddr, 0);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3f2249b4cd5f..400243c89d82 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -273,9 +273,10 @@ static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
}

struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
+ int nhoff,
__be16 sport, __be16 dport)
{
- const struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)(skb->data + nhoff);
struct net *net = dev_net(skb->dev);
int iif, sdif;

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 6b95ba241ebe..f930efd27180 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -162,14 +162,15 @@ struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb)
return NULL;
}

-INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff,
+ int thoff)
{
- const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);

/* do fraglist only if there is no outer UDP encap (or we already processed it) */
if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) {
- uh->len = htons(skb->len - nhoff);
+ uh->len = htons(skb->len - thoff);

skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
@@ -186,10 +187,10 @@ INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
}

if (uh->check)
- uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
+ uh->check = ~udp_v6_check(skb->len - thoff, &ipv6h->saddr,
&ipv6h->daddr, 0);

- return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
+ return udp_gro_complete(skb, nhoff, thoff, udp6_lib_lookup_skb);
}

static const struct net_offload udpv6_offload = {
--
2.36.1