linux-toradex.git/net/ipv6/udp_offload.c, branch v4.4.58

ipv6: hash net ptr into fragmentation bucket selection

2015-03-25T18:07:04+00:00

As namespaces are sometimes used with overlapping ip address ranges,
we should also use the namespace as input to the hash to select the ip
fragmentation counter bucket.

Cc: Eric Dumazet 
Cc: Flavio Leitner 
Signed-off-by: Hannes Frederic Sowa 
Signed-off-by: David S. Miller

ipv6: call ipv6_proxy_select_ident instead of ipv6_select_ident in udp6_ufo_fragment

2015-03-20T16:56:11+00:00

Matt Grant reported frequent crashes in ipv6_select_ident when
udp6_ufo_fragment is called from openvswitch on a skb that doesn't
have a dst_entry set.

ipv6_proxy_select_ident generates the frag_id without using the dst
associated with the skb.  This approach was suggested by Vladislav
Yasevich.

Fixes: 0508c07f5e0c ("ipv6: Select fragment id during UFO segmentation if not set.")
Cc: Vladislav Yasevich 
Reported-by: Matt Grant 
Tested-by: Matt Grant 
Signed-off-by: Sabrina Dubroca 
Acked-by: Vladislav Yasevich 
Signed-off-by: David S. Miller

udp: Set SKB_GSO_UDP_TUNNEL* in UDP GRO path

2015-02-11T23:12:10+00:00

Properly set GSO types and skb->encapsulation in the UDP tunnel GRO
complete so that packets are properly represented for GSO. This sets
SKB_GSO_UDP_TUNNEL or SKB_GSO_UDP_TUNNEL_CSUM depending on whether
non-zero checksums were received, and sets SKB_GSO_TUNNEL_REMCSUM if
the remote checksum option was processed.

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller

ipv6: Select fragment id during UFO segmentation if not set.

2015-02-04T07:06:43+00:00

If the IPv6 fragment id has not been set and we perform
fragmentation due to UFO, select a new fragment id.
We now consider a fragment id of 0 as unset and if id selection
process returns 0 (after all the pertrubations), we set it to
0x80000000, thus giving us ample space not to create collisions
with the next packet we may have to fragment.

When doing UFO integrity checking, we also select the
fragment id if it has not be set yet.   This is stored into
the skb_shinfo() thus allowing UFO to function correclty.

This patch also removes duplicate fragment id generation code
and moves ipv6_select_ident() into the header as it may be
used during GSO.

Signed-off-by: Vladislav Yasevich 
Signed-off-by: David S. Miller

net: Remove MPLS GSO feature.

2014-11-06T07:52:33+00:00

Device can export MPLS GSO support in dev->mpls_features same way
it export vlan features in dev->vlan_features. So it is safe to
remove NETIF_F_GSO_MPLS redundant flag.

Signed-off-by: Pravin B Shelar

udp: Changes to udp_offload to support remote checksum offload

2014-11-05T21:30:03+00:00

Add a new GSO type, SKB_GSO_TUNNEL_REMCSUM, which indicates remote
checksum offload being done (in this case inner checksum must not
be offloaded to the NIC).

Added logic in __skb_udp_tunnel_segment to handle remote checksum
offload case.

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller

fou: eliminate IPv4,v6 specific GRO functions

2014-10-03T23:53:32+00:00

This patch removes fou[46]_gro_receive and fou[46]_gro_complete
functions. The v4 or v6 variants were chosen for the UDP offloads
based on the address family of the socket this is not necessary
or correct. Alternatively, this patch adds is_ipv6 to napi_gro_skb.
This is set in udp6_gro_receive and unset in udp4_gro_receive. In
fou_gro_receive the value is used to select the correct inet_offloads
for the protocol of the outer IP header.

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller

udp: Generalize skb_udp_segment

2014-10-02T01:35:51+00:00

skb_udp_segment is the function called from udp4_ufo_fragment to
segment a UDP tunnel packet. This function currently assumes
segmentation is transparent Ethernet bridging (i.e. VXLAN
encapsulation). This patch generalizes the function to
operate on either Ethertype or IP protocol.

The inner_protocol field must be set to the protocol of the inner
header. This can now be either an Ethertype or an IP protocol
(in a union). A new flag in the skbuff indicates which type is
effective. skb_set_inner_protocol and skb_set_inner_ipproto
helper functions were added to set the inner_protocol. These
functions are called from the point where the tunnel encapsulation
is occuring.

When skb_udp_tunnel_segment is called, the function to segment the
inner packet is selected based on the inner IP or Ethertype. In the
case of an IP protocol encapsulation, the function is derived from
inet[6]_offloads. In the case of Ethertype, skb->protocol is
set to the inner_protocol and skb_mac_gso_segment is called. (GRE
currently does this, but it might be possible to lookup the protocol
in offload_base and call the appropriate segmenation function
directly).

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller

net: Remove gso_send_check as an offload callback

2014-09-26T04:22:47+00:00

The send_check logic was only interesting in cases of TCP offload and
UDP UFO where the checksum needed to be initialized to the pseudo
header checksum. Now we've moved that logic into the related
gso_segment functions so gso_send_check is no longer needed.

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller

udp: move logic out of udp[46]_ufo_send_check

2014-09-26T04:22:46+00:00

In udp[46]_ufo_send_check the UDP checksum initialized to the pseudo
header checksum. We can move this logic into udp[46]_ufo_fragment.
After this change udp[64]_ufo_send_check is a no-op.

Signed-off-by: Tom Herbert 
Signed-off-by: David S. Miller