The kernel now has the capability to offload FDB and FIB entries to hardware.
It is important to let users know if table entries are also offloaded to
hardware.  Currently offloaded FDB entries are indicated by the existence of
the flag 'external' on the entry as of the following commit:

commit 28467b7f
Author: Scott Feldman <sfeldma@gmail.com>
Date:   Thu Dec 4 09:57:15 2014 +0100

    bridge/fdb: add flag/indication for FDB entry synced from offload device

When the patch to add support for indicating that FIB entries were also
offloaded as posted to netdev by Scott Feldman it became clear that 'external'
would not be an ideal name for routes.  There could definitely be confusion
about what this might mean since many routes are to external networks -- a
collision/confusion that did not happen with FDB.

Scott Feldman asked me to check with others and build concensus around a name.
After speaking with several people about this I am proposing we refer to both
FDB and FIB entries that are currently backed by hardware (based on the work
done in rocker) with the flag 'offload' appended to the end ofthe entry.

Some people liked the string 'external,' others liked 'hardware,' but the point
is to communicate that these routes are available to something that will will
offload the forwarding normally done by the kernel.  Since the term 'offload'
is used so frequently it seems appropriate to use the same language in
ip/bridge output.

The term 'offload' also seems to resonate with many of the people who have
responded on Scott's original thread or to those who I reached out to directly
and did respond to my query, so it seems we have reached consensus that it
should be the term used going forward.

v2: rebased against net-next branch
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
CC: Jamal Hadi Salim <jhs@mojatatu.com>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: John W. Linville <linville@tuxdriver.com>
CC: Roopa Prabhu <roopa@cumulusnetworks.com>
CC: Scott Feldman <sfeldma@gmail.com>
CC: Stephen Hemminger <stephen@networkplumber.org>

The goal of this patch is to test during the runtime if the command RTM_GETNSID
is supported by the kernel.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

This reverts commit d116ff34.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

This reverts commit d059de70.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

This work finalizes both eBPF front-ends for the classifier and action
part in tc, it allows for custom ELF section selection, a simplified tc
command frontend (while keeping compat), reusing of common maps between
classifier and actions residing in the same object file, and exporting
of all map fds to an eBPF agent for handing off further control in user
space.

It also adds an extensive example of how eBPF can be used, and a minimal
self-contained example agent that dumps map data. The example is well
documented and hopefully provides a good starting point into programming
cls_bpf and act_bpf.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

Fixes: d116ff34 ("ip netns: Fix rtnl error while print netns list")
Signed-off-by: Jiri Benc <jbenc@redhat.com>

- document ip xfrm policy set
- update ip xfrm monitor documentation
- in DESCRIPTION section, reorganize grouping of commands
Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>

add a new command to configure the SPD hash table:
   ip xfrm policy set [ hthresh4 LBITS RBITS ] [ hthresh6 LBITS RBITS ]

and code to display the SPD hash configuration:
  ip -s -s xfrm policy count

hthresh4: defines minimum local and remote IPv4 prefix lengths of
selectors to hash a policy. If prefix lengths are greater or equal
to the thresholds, then the policy is hashed, otherwise it falls back
in the policy_inexact chained list.

hthresh6: defines minimum local and remote IPv6 prefix lengths of
selectors to hash a policy, otherwise it falls back
in the policy_inexact chained list.

Example:

% ip -s -s xfrm policy count
         SPD IN  0 OUT 0 FWD 0 (Sock: IN 0 OUT 0 FWD 0)
         SPD buckets: count 7 Max 1048576
         SPD IPv4 thresholds: local 32 remote 32
         SPD IPv6 thresholds: local 128 remote 128

% ip xfrm pol set hthresh4 24 16 hthresh6 64 56

% ip -s -s xfrm policy count
         SPD IN  0 OUT 0 FWD 0 (Sock: IN 0 OUT 0 FWD 0)
         SPD buckets: count 7 Max 1048576
         SPD IPv4 thresholds: local 24 remote 16
         SPD IPv6 thresholds: local 64 remote 56
Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>

Current santized kernel headers from net-next

Need to include netinet/in.h to get the correct glibc headers
instead of getting definitions in linux/in6.h

Conflicts:
	man/man8/ip-route.8.in

Result of the following command:

    sed -ri 's/\.  /. /g' man/*/*
Signed-Off-By: Pavel Šimerda <psimerda@redhat.com>

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

Output of the usage was shifted be cause of missing TAB
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

If '-nm' specified that do not fail if there is no
default class names file in /etc/iproute2.

Changed default class name file cls_names -> tc_cls.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

This allows querying and setting the route preference. It's usually set from
the IPv6 Neighbor Discovery Router Advertisement messages.

Introduced in "ipv6: expose RFC4191 route preference via rtnetlink", enqueued
for Linux 4.1.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

- Pull in the uapi mpls.h
- Update rtnetlink.h to include the mpls rtnetlink notification multicast group.
- Define AF_MPLS in utils.h if it is not defined from elsewhere
  as is done with AF_DECnet

The address syntax for multiple mpls labels is a complete invention.
When I looked there seemed to be no wide spread convention for talking
about an mpls label stack in text for.  Sometimes people did:
"{ Label1, Label2, Label3 }", sometimes people would do:
"[ label3, label2, label1 ]", and most of the time label
stacks were not explicitly shown at all.

The syntax I wound up using, so it would not have spaces and so it
would visually distinct from other kinds of addresses is.

label1/label2/label3 Where label1 is the label at the top of the label
stack and label3 is the label at the bottom on the label stack.

When there is a single label this matches what seems to be convention
with other tools.  Just print out the numeric value of the mpls label.

The netlink protocol for labels uses the on the wire format for a
label stack. The ttl and traffic class are expected to be 0.  Using
the on the wire format is common and what happens with other address
types. BGP when passing label stacks also uses this technique with the
exception that the ttl byte is not included making each label in a BGP
label stack 3 bytes instead of 4.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

This attribute is like RTA_DST except it specifies the destination
address to place on a packet when it leaves the host.  For ip based
protocols this is destination NAT and not a common part of forwarding.
For protocols like MPLS label swapping is something that typically
happens on every hop.

There is likely to be a RTA_NEWSRC at some point so RTA_NEWDST
is printed as "as to"  and can be specified either as "as to"
or just "as"
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Add support for the RTA_VIA attribute that specifies an address family
as well as an address for the next hop gateway.

To make it easy to pass this reorder inet_prefix so that it's tail
is a proper RTA_VIA attribute.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Add the functions family_name and read_family to convert an address
family to a string and to convernt a string to an address family.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

This avoids build warnings when AF_PACKET support is added
to rt_addr_n2a.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

For some address families (like AF_PACKET) it is helpful to have the
length when prenting the address.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

This work adds the tc frontend for kernel commit e2e9b6541dd4 ("cls_bpf:
add initial eBPF support for programmable classifiers").

A C-like classifier program (f.e. see e2e9b6541dd4) is being compiled via
LLVM's eBPF backend into an ELF file, that is then being passed to tc. tc
then loads, if any, eBPF maps and eBPF opcodes (with fixed-up eBPF map file
descriptors) out of its dedicated sections, and via bpf(2) into the kernel
and then the resulting fd via netlink down to cls_bpf. cls_bpf allows for
annotations, currently, I've used the file name for that, so that the user
can easily identify his filter when dumping configurations back.

Example usage:

  clang -O2 -emit-llvm -c cls.c -o - | llc -march=bpf -filetype=obj -o cls.o
  tc filter add dev em1 parent 1: bpf run object-file cls.o classid x:y

  tc filter show dev em1 [...]
  filter parent 1: protocol all pref 49152 bpf handle 0x1 flowid x:y cls.o

I placed the parser bits derived from Alexei's kernel sample, into tc_bpf.c
as my next step is to also add the same support for BPF action, so we can
have a fully fledged eBPF classifier and action in tc.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>

Lastest features

Include the bpf.h uapi header file.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

Joining multicast group on ethernet level via "ip maddr" command would
not work if we have an Ethernet switch that does igmp snooping since
the switch would not replicate multicast packets on ports that did not
have IGMP reports for the multicast addresses.

Linux vxlan interfaces created via "ip link add vxlan" have the group option
that enables then to do the required join.

By extending ip address command with option "autojoin" we can get similar
functionality for openvswitch vxlan interfaces as well as other tunneling
mechanisms that need to receive multicast traffic.

example:
ip address add 224.1.1.10/24 dev eth5 autojoin
ip address del 224.1.1.10/24 dev eth5

On ip route print dump, label externally offloaded routes with "external".
Offloaded routes are flagged with RTNH_F_EXTERNAL, a recent additon to
net-next.  For example:

$ ip route
default via 192.168.0.2 dev eth0
11.0.0.0/30 dev swp1  proto kernel  scope link  src 11.0.0.2 external
11.0.0.4/30 via 11.0.0.1 dev swp1  proto zebra  metric 20 external
11.0.0.8/30 dev swp2  proto kernel  scope link  src 11.0.0.10 external
11.0.0.12/30 via 11.0.0.9 dev swp2  proto zebra  metric 20 external
12.0.0.2  proto zebra  metric 30 external
        nexthop via 11.0.0.1  dev swp1 weight 1
        nexthop via 11.0.0.9  dev swp2 weight 1
12.0.0.3 via 11.0.0.1 dev swp1  proto zebra  metric 20 external
12.0.0.4 via 11.0.0.9 dev swp2  proto zebra  metric 20 external
192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.15
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Reviewed-by: Jiri Pirko <jiri@resnulli.us>

Use sanitized headers from 4.0.0-rc3

Next argument after the tc opcode/verdict is optional, using NEXT_ARG()
requires to have another argument after that one otherwise tc will bail
out. Therefore, we need to advance to the next argument manually as done
elsewhere.

Fixes: 86ab59a6 ("tc: add support for BPF based actions")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Pirko <jiri@resnulli.us>

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

commit f3a2ddc1 ("lib utils: Use helpers to get AF bit/byte len")
used a wrong family or family of zero in the default case
during af_bit_len calculation causing ip route commands to
fail with below error

Error: an inet prefix is expected rather than "10.0.2.14/24".
Reported-by: Sven-Haegar Koch <haegar@sdinet.de>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>