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udp: never accept GSO_FRAGLIST packets 

Currently the UDP protocol delivers GSO_FRAGLIST packets to
the sockets without the expected segmentation.

This change addresses the issue introducing and maintaining
a couple of new fields to explicitly accept SKB_GSO_UDP_L4
or GSO_FRAGLIST packets. Additionally updates  udp_unexpected_gso()
accordingly.

UDP sockets enabling UDP_GRO stil keep accept_udp_fraglist
zeroed.

v1 -> v2:
 - use 2 bits instead of a whole GSO bitmask (Willem)

Fixes: 9fd1ff5d2a ("udp: Support UDP fraglist GRO/GSO.")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-03-30 12:28:52 +02:00 committed by David S. Miller
parent e0e3070a9b
commit 78352f73dc
2 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/udp.h
View File

@ -51,7 +51,9 @@ struct udp_sock {
* different encapsulation layer set
* this
*/
gro_enabled:1; /* Can accept GRO packets */
gro_enabled:1, /* Request GRO aggregation */
accept_udp_l4:1,
accept_udp_fraglist:1;
/*
* Following member retains the information to create a UDP header
* when the socket is uncorked.
@ -131,8 +133,16 @@ static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk,
static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb)
{
return !udp_sk(sk)->gro_enabled && skb_is_gso(skb) &&
skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4;
if (!skb_is_gso(skb))
return false;
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !udp_sk(sk)->accept_udp_l4)
return true;
if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST && !udp_sk(sk)->accept_udp_fraglist)
return true;
return false;
}
#define udp_portaddr_for_each_entry(__sk, list) \

3
net/ipv4/udp.c
View File

@ -2666,9 +2666,12 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
case UDP_GRO:
lock_sock(sk);
/* when enabling GRO, accept the related GSO packet type */
if (valbool)
udp_tunnel_encap_enable(sk->sk_socket);
up->gro_enabled = valbool;
up->accept_udp_l4 = valbool;
release_sock(sk);
break;