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When switching to narrow metric style, all configured circuits are
verified to have a valid narrow style metric. Check te_metric instead
of metric_default as the latter is only 8bit wide and may overflow for
wide style metrics.
Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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this fixes a bunch of issues found by Coverity SCAN and flagged as
"high" impact -- although, they're all rather minute issues.
* isisd/isis_adjacency.c: one superfluous check, one possible NULL deref
* isisd/isis_circuit.c: two prefix memory leaks
* isisd/isis_csm.c: one missing break
* isisd/isis_lsp.c: one possible NULL deref
* isisd/isis_pfpacket.c: one error-case fd leak
* isisd/isis_route.c: one isis_route_info memory leak
* isisd/isis_routemap.c: one... fnord
* isisd/isis_tlv.c: one infinite loop
Reported-by: Coverity SCAN
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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The socket is only created once when an interface is brought up, and the
multicast groups were joined according to configuration at that point.
This breaks when later switching an interface to another IS-IS level.
Since, for a separate conformance issue (ANVL ISIS-6.4), we should be
inspecting the destination address anyway, the simplest fix here is to
just join all groups unconditionally. There shouldn't be much traffic
on these anyway, worst case we might be picking up some unrelated
multicast groups due to NIC filter aliasing though...
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Tested-by: Martin Winter <mwinter@opensourcerouting.org>
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isisd defaults to wide metric style. So if narrow metric style is
configured, a matching setting should be written to the configuration,
allowing a narrow metric-style setting to be saved.
Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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spftree_area_del didn't clear the IPv6 L2 spftree due to a simple typo,
leading to a SEGV on shutdown when the still-armed timer would try to
run an IPv6 L2 SPF calculation with its data free'd already.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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isisd should not form adjacencies on receiving an IS-IS Hello without a
list of supported protocols (cf. RFC 1195 s4.4 p32 "Maintaining Router
Adjacencies") Also fixes memleaks in these error cases.
* isisd/isis_pdu.c: improve TLVFLAG_NLPID handling
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Tested-by: Martin Winter <mwinter@opensourcerouting.org>
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isisd would form an adjacency with another router despite the system IDs
being identical. This would later cause an assertion failure like this:
assertion=0x555555596db8 "isis_find_vertex (spftree->paths, id, vtype) == ((void *)0)",
file=0x555555596c60 "isis_spf.c", line=515, function=0x555555597900 "isis_spf_add2tent") at log.c:619
which is caused by trying to add a path expected to not exist, but
suddenly colliding due to the duplicate system ID.
* isis_pdu.c: check for system ID collision on receiving Hello
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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RFC1195 s4.2 "Multiple IP Addresses per Interface" explicitly forbids us
from adding multiple tuples of IP addresses, putting a hard cutoff at 63
IP addresses.
* isisd/isis_tlv.c: cut off (and return success) at 63 addrs.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Tested-by: Martin Winter <mwinter@opensourcerouting.org>
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If enabled with --with-pkg-gitversion on ./configure, this will append
git version strings and branch information at the following places:
- overall version number: 0.99.21-g0123456
- login motd and show version: tag information + git id + branches
Sample output:
Hello, this is Quagga (version 0.99.21-g14b49ad-dirty).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
This is a git build of quagga_0_99_21_release-106-g14b49ad-dirty
Associated branch(es):
local:master
[v2]: fix build without gitinfo (add "else" branch)
[v2]: fix for repos without any tags (different git describe output)
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* zebra/zebra_fpm_netlink.c
Change the zebra FPM code to include an interface index when
encoding a nexthop even if the protocol only provided a gateway
address (e.g, NEXTHOP_TYPE_IPV4).
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Update documentation with some text on the zebra interface to the
optional Forwarding Path Manager component, and the related cli
commands.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Enhance zebra to send routes to the (optional) Forwarding Path Manager
component using the interface defined by fpm/fpm.h.
* configure.ac
- Add --enable-fpm flag.
The FPM-related code in zebra is activated only if the build is
configured with '--enable-fpm'.
- Add HAVE_NETLINK automake conditional.
This allows us to conditionally build netlink-dependent C code.
* zebra/{rib.h,zebra_rib.c}
- Add the 'fpm_q_entries' field to the rib_dest_t structure. This
allows dests to be placed on the fpm queue.
- Define a couple new rib_dest_t flags that hold FPM-related
state.
- Invoke the zfpm_trigger_update() function for a route_node
whenever the information to be sent to the FPM changes.
- rib_can_delete_dest(): Return FALSE if we have to update the FPM
about the given dest. This ensures that the dest is not deleted
even if there are no ribs hanging off of it.
* zebra/zebra_fpm.c
This file holds most of the code for interacting with the FPM.
- If quagga was configured with '--enable-fpm', periodically try
to connect to the FPM.
- When the connection comes up, enqueue all relevent dests to the
FPM queue.
- When the FPM socket is readable, dequeue the next rib_dest_t
from the FPM queue, encode it in to a message and send the
message to the FPM.
- When the connection to the FPM goes down, remove all dests from
the FPM queue, and then start trying to connect to the FPM
again.
- Expose the following new operational commands:
show zebra fpm stats
clear zebra fpm stats
* zebra/zebra_fpm_netlink.c
- zfpm_netlink_encode_route(): Function to encode information
about a rib_dest_t in netlink format.
* zebra/zebra_fpm_private.h
Private header file for the zebra FPM module.
* zebra/zebra_fpm.h
Header file exported by zebra FPM module to the rest of zebra.
* zebra/debug.c
Add the 'debug zebra fpm' command.
* zebra/main.c
Initialize the zebra-FPM code on startup.
* zebra/misc_null.c
Add stub for zfpm_trigger_update().
* zebra/Makefile.am
- Include new file zebra_fpm.c in build.
- Include zebra_fpm_netlink.c in build if HAVE_NETLINK is defined.
* vtysh/Makefile.am
Include zebra_fpm.c in list of files that define cli commands.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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The Forwarding Plane Manager (FPM) is an optional component that may
be used in scenarios where the router has a forwarding path that is
distinct from the kernel, commonly a hardware-based fast path. It is
responsible for programming forwarding information (such as routes and
nexthops) in the fast path.
In Quagga, the Routing Information Base is maintained in the 'zebra'
infrastructure daemon. Routing protocols communicate their best routes
to zebra, and zebra computes the best route across protocols for each
prefix. This latter information comprises the bulk of the Forwarding
Information Base.
The new header file added by this patch, 'fpm/fpm.h', defines a
point-to-point interface using which zebra can update the FPM about
changes in routes. The communication takes place over a stream
socket. The FPM listens on a well-known TCP port, and zebra initiates
the connection.
All messages sent over the connection start with a short 'FPM header'.
In the case of route add/delete messages, the header is followed by a
netlink message. Zebra should send a complete copy of the forwarding
table(s) to the FPM, including routes that it may have picked up from
the kernel.
The FPM interface uses replace semantics. That is, if a 'route add'
message for a prefix is followed by another 'route add' message, the
information in the second message is complete by itself, and replaces
the information sent in the first message.
If the connection to the FPM goes down for some reason, the client
(zebra) should send the FPM a complete copy of the forwarding table(s)
when it reconnects.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Bring in sys/queue.h from the FreeBSD tree as lib/queue.h.
This header implements lists of various flavors using inline
linkages. The imported file corresponds to SVN revision 221843 (url
below) and is available under the terms of the New BSD license
(3-clause).
http://svnweb.freebsd.org/base/head/sys/sys/queue.h?revision=221843
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* zebra/{rib.h,zebra_rib.c}
Add nexthop_type_to_str(), which returns a human-readable string
corresponding to a nexthop type.
* zebra/rt_netlink.[hc]
- Add new header file that exposes some existing and new
netlink-related functions from rt_netlink.c to the rest of
zebra.
addattr32
addattr_l
rta_addattr_l
nl_msg_type_to_str (new)
nl_rtproto_to_str (new)
- Use nexthop_type_to_str() instead of the static array
'nexthop_types_desc'.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* lib/zebra.h
Add macro ZEBRA_NUM_OF, which returns the number of elements in a
static array.
* zebra/rib.h
Add the rib_tables_iter_t structure and associated functions,
which allow one to walk all tables in the rib.
* zebra/zebra_rib.c
- Add vrf_id_get_next() to retrieve the first VRF id (if any) that
is greater than a given VRF id.
- Add rib_tables_iter_next().
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Add some code that allows us to determine which VRF and AFI/SAFI a
given RIB table corresponds to.
* zebra/rib.h
Add rib_table_info_t structure, which contains information about
the VRF, AFI and SAFI that a table is for.
* zebra/zebra_rib.c
- Add the vrf_table_create() function, which creates a table and
sets its 'info' pointer to a newly created rib_table_info_t.
The 'info' pointer allows us to go from a route_node or a table
to the associated vrf.
- vrf_alloc(): Use vrf_create_table() to create tables.
* lib/memtypes.c
Add memory type for rib_table_info_t.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Add the rib_dest_t structure to hold per-prefix state in the routing
information base. This gives us an appropriate place to maintain the
queueing state of a route_node. Queuing state was previously being
stored on the first rib in the list of ribs hanging off the
route_node.
* zebra/rib.h
- Add new structure rib_dest_t.
- Remove the rn_status field from 'struct rib', it is no longer
required.
- Add macros (RNODE_FOREACH_RIB, RNODE_FOREACH_RIB_SAFE) for
walking all 'struct ribs' corresponding to a route_node. These
hide the fact that there is an intermediate rib_dest_t
structure.
- Add a few utility inlines to go between a rib_dest_t and
associated structures.
* zebra/zebra_rib.c
- rib_link()/rib_unlink()
Tweak for new behavior, where the 'info' pointer of a route_node
points to a rib_dest_t. The list of ribs for a prefix now hangs
off of the dest.
Change the way we ref count route_nodes. We now hold a single
ref count on a route_node if there is a corresponding
rib_dest_t.
- Maintain the queuing state of a route_node on the flags field of
the rib_dest_t.
- Add the rib_gc_dest() function, which deletes a rib_dest_t if it
is no longer required. A rib_dest_t can be deleted iff there are
no struct ribs hanging off of it.
- Call rib_gc_dest() any time we unlink a rib from the
rib_dest_t. Currently we only need to call it once, just before
we return from rib_process().
* zebra/{redistribute,zebra_rib,zebra_snmp,zebra_vty}.c
Use new macros to walk over route_node ribs.
* lib/memtypes.c
Add memory type for rib_dest_t.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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When going through the code to write the documentation for local-as,
I discovered that one of the comments was out-of-date.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Added replace-as modifier for BGP neighbors when using
local-as. If the replace-as modifier is specified, only the
replacement AS as specified by the local-as modifier is
prepended to the AS_PATH, not the process's AS.
In bgp_attr.c, I decided that
if (peer->change_local_as) {
/* If replace-as is specified, we only use the change_local_as when
advertising routes. */
if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) {
aspath = aspath_add_seq (aspath, peer->local_as);
}
aspath = aspath_add_seq (aspath, peer->change_local_as);
} else {
aspath = aspath_add_seq (aspath, peer->local_as);
}
was clearer than the alternative that didn't duplicate the prepending of the
process's AS:
/* First, append the process local AS unless we have an alternate local_as
* and we're replacing it (as opposed to just prepending it). */
if (! (peer->change_local_as
&& CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) ) {
aspath = aspath_add_seq (aspath, peer->local_as);
}
if (peer->change_local_as)
aspath = aspath_add_seq (aspath, peer->change_local_as);
}
But I could be convinced otherwise.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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There is no Posix CLOCK_MONOTONIC in Darwin, but monotonically
increasing clock can be implemented using mach_absolute_time().
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* isisd/isis_spf.c: Use portable quagga_gettime() like the rest of
the Quagga code.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* ospfd/ospf_apiserver.c: extra ; causing lookup to fail always
* ospfd/ospf_lsa.c: extra ; causing debug output even when disabled
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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ifi_link_state missing in OS X. There could be other *BSD's that haven't
implemented it and possibly affects older implementations.
The existing HAVE_BSD_LINK_DETECT configure.ac check is only confirming
the link state detection using ifmediareq.ifm_status found in
<net/if_media.h>. This is the link state detection used in
zebra/ioctl.c. Later, *BSD redefined struct if_data in <net/if.h> and
included link state detection. This is the method used in
zebra/kernel_socket.c
Additional test defined in config.ac to test for member struct
if_data.ifi_link_state defined in <net/if.h> separate from test for
<net/if_media.h> ifmediareq.ifm_status
Fixed #ifdef's in zebra/kernel_socket.c to use the new #define
No impact on older function calls in zebra/ioctl.c
Tested on 64bit OS X 10.7, FreeBSD 9.0 amd64 & i386 (32bit)
using gcc & clang. Tested on linux 64bit.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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In zebra/kernel_socket.c, copying sockaddr from *_msghdr:
There are really 2 different lengths that need to be determined.
1) the length required to point to the next sockaddr in the mesg
buffer which might include any required padding and
2) the actual length of the sockaddr data that needs to be copied
into the destination field.
They may or may not be the same value.
Sizeof sockaddr_in6 is 28, which to pad for alignment purposes on 32
bit systems with a long of 4 bytes is evenly divided and requires
no padding. On 64 bit systems, with a long of 8 it is padded with 4
extra bytes.So the current RTA_* macros are copying 32 bytes into a 28
byte field on 64 bitsystems, where the field overflow did not occur
on the 32 bit systems.
Since using sa_len required the use of an #ifdef which couldn't be used
directly inside a #define, it made sense to move the copy into the
function to allow typdef checking throughout and eliminate the hack
to suppress compiler warnings.
Fixed declaration of cp in ifm_read after compiler noticed type mismatch.
Tested on 64bit OS X 10.7, FreeBSD 9.0 amd64 & i386 (32bit)
using gcc & clang
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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In OS X 10.7 zebra crashed on invalid execution address.
sockaddr padding in *_msghdr is observed to be 4 bytes in 64bit OS X.
The ROUNDUP macro assumed alignment on sizeof(long) which
allocates 8 bytes on 64bit systems, 4 bytes on 32bit systems
which is true for BSD generally.
Test for Apple and use sizeof(int) which allocates 4 bytes on 32 & 64bit
systems.
Tested on 64bit OS X 10.7, FreeBSD 9.0 amd64 & i386 (32bit)
using gcc & clang
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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configure parameters have changed quite a bit, several options are
enabled by default now and there's --disable-tests. Update
documentation to match.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Broke the tests again... let's just build them by default so it's easier
to notice. If anyone doesn't want to build tests, there's
--disable-tests.
NB: tests will be neither run nor installed.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* tests/test-sig.c: add #include "lib/memory.h" to get array_size()
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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An ORF (code 3) capability TLV is defined to contain exactly one
AFI/SAFI block. Function bgp_capability_orf(), which parses ORF
capability TLV, uses do-while cycle to call its helper function
bgp_capability_orf_entry(), which actually processes the AFI/SAFI data
block. The call is made at least once and repeated as long as the input
buffer has enough data for the next call.
The helper function, bgp_capability_orf_entry(), uses "Number of ORFs"
field of the provided AFI/SAFI block to verify, if it fits the input
buffer. However, the check is made based on the total length of the ORF
TLV regardless of the data already consumed by the previous helper
function call(s). This way, the check condition is only valid for the
first AFI/SAFI block inside an ORF capability TLV.
For the subsequent calls of the helper function, if any are made, the
check condition may erroneously tell, that the current "Number of ORFs"
field fits the buffer boundary, where in fact it does not. This makes it
possible to trigger an assertion by feeding an OPEN message with a
specially-crafted malformed ORF capability TLV.
This commit fixes the vulnerability by making the implementation follow
the spec.
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The linker on some systems (for example, Ubuntu 12.04 LTS x86_64)
appears to be sensitive to the order in which libraries are
specified. On these systems, if a library 'A' depends on a library
'B', it has to be specified before 'B' when linking an executable.
* zebra/Makefile.am: Make sure LIBCAP comes after libzebra.
* tests/Makefile.am: Ensure libm comes after libbgp.
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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flock()ing the BGP dump files helps consumers determine when they're
safe to read.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Mac OS X needs HAVE_IP_HDRINCL_BSD_ORDER defined like BSD. If it's not
defined, it'll fail like this:
*** sendmsg in ospf_write failed to 224.0.0.5, id 0, off 0, len 64,
interface en0, mtu 1500: Invalid argument
Which is caused by reordering iph->ip_len in
sockopt_iphdrincl_swab_htosys.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Use the array_size() helper macro. Replaces several instances of local
macros with the same definition.
Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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isisd currently has a list of supported protocols as a fixed array of
size 4. this can be overran, leading to an overwrite of the ipv4_addrs
pointer.
* isisd/isis_pdu.c: don't accept more protocols than there's space for
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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implement array_size as sizeof(array) / sizeof(array element)
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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it's possible to feed invalid prefixes (1.2.3.4/40 or dead::beef/200) on
IS-IS. if this is not checked, it will later cause an assert in
processing. let's simply abort processing the TLV if the prefix is
invalid.
* isisd/isis_tlv.c: check prefix lengths for validity
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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processing invalid prefixes causes isisd to assert() or otherwise
misbehave in ip_masklen/apply_mask. pull up the assert() to indicate
better there's broken data in isisd's LSDB.
* isisd/isis_spf.c: assert() prefix lengths
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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* isisd/isis_pdu.c: (send_lsp) Handle case where there are no LSPs
on the LSP transmission queue. This can happen if, for instance,
the queue is cleared because of protocol events before the
send_lsp thread gets a chance to run.
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* isisd/isis_pdu.c: Fix problem where isisd would crash if it
received a LAN IIH with the 'pdu length' field set to zero.
Similar problems can occur in parsing other ISIS PDUs as well --
check that the PDU length in an ISIS hello, LSP or SNP packet is
at least as big as the size of the respective fixed header.
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* lib/stream.c: (stream_set_endp) Add checks to make sure that the
supplied 'endp' is within the 'size' of the stream, and that the
current read pointer 'getp' is not beyond the specified 'endp'.
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ISSUE
When max-metric router-lsa administrative is invoked on an ABR created with...
area <area> range <addr/mask>
the summary LSAs are sent out with 65535 (max-metric) added to the normal cost.
When max-metric router-lsa administrative is invoked on an ABR created with...
area <area> range <addr/mask> cost <cost>
the summary LSAs are sent out with <cost> (the max-metric is ignored). This
second behavior effectively incapacitates the max-metric function.
PATCH
This patch evaluates the state of the router and if it's isolated as a stub
router (rfc3137) via `max-metric router-lsa`, we unconditionally uses the
value of 0xff0000 when advertising summary LSAs.
Signed-off-by: JR Rivers <jrrivers@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: Ayan Banerjee <ayan@cumulusnetworks.com>
Reviewed-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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When a range (or sub-range) is deleted, the area is notified by propagating a
MAXAGE LSA. This LSA stays in the database for a while to both insure
propagation as well as in the off chance that it's useful in the near future.
Unfortunately, the ABR algorithm was treating these MAXAGE LSAs as unchanged and
not propagating them within the areas.
Signed-off-by: JR Rivers <jrrivers@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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ISSUE
When an area range is created in which there the sub-area has routes that are
smaller than the range, an ABR creates a blackhole route to cover the range.
When the range is removed, the blackhole route is not removed.
--A----B----C---
B is an ABR with A in area 1 and C in area 0. If A advertises `10.2.0.0/30` and
`10.2.0.4/30` and B is configured with `area 0.0.0.1 range 10.2.0.0/29` a
blackhole is created on B (`blackhole 10.2.0.0/29 proto zebra`). When the
area/range is removed via the command line, the blackhole remains in existence
even though the "range" route is removed from area 0 and the individual routes
are propagated.
PATCH
The reason for this behavior is that, prior to this patch, the range is deleted
from the area's list, so when ospf_abr_manage_discard_routes() gets called,
there is nothing to clean up. The patch removes the discard route as part of
the processing of the command line (ospf_area_range_unset()).
Signed-off-by: JR Rivers <jrrivers@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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OVERVIEW
The checksum used in OSPF (rfc2328) is specified in rc905 annex B. There is an
sample implementation in rfc1008 which forms the basis of the quagga
implementation. This algorithm works perfectly when generating a checksum;
however, validation is a bit problematic.
The following LSA (generated by a non-quagga implementation) is received by
quagga and marked with an invalid checksum; however, it passes both the rfc905
and rfc1008 validation checks.
static uint8_t lsa_10_121_233_29[] = {
0x0e, 0x10, 0x02, 0x03,
0x09, 0x00, 0x35, 0x40,
0x0a, 0x79, 0xe9, 0x1d,
0x80, 0x00, 0x00, 0x03,
0x00, 0x8a, 0x00, 0x1c,
0xff, 0xff, 0xff, 0xe0,
0x00, 0x00, 0x36, 0xb0
};
LS Type: Summary-LSA (IP network)
LS Age: 3600 seconds
Do Not Age: False
Options: 0x02 (E)
Link-State Advertisement Type: Summary-LSA (IP network) (3)
Link State ID: 9.0.53.64
Advertising Router: 10.121.233.29 (10.121.233.29)
LS Sequence Number: 0x80000003
LS Checksum: 0x008a
Length: 28
Netmask: 255.255.255.224
Metric: 14000
You'll note that one byte of the checksum is 0x00; quagga would calculate the
checksum as 0xff8a.
It can be argued that the sourcing implementation generates an incorrect
checksum; however, rfc905 indicates that, for 1's complement arithmetic, the
value 255 shall be regarded as 0, thus either values are valid.
EXPLANATION
The quagga ospfd and ospf6d implementations operate by copying the PDU's
existing checksum in a holding variable, calculating the checksum, and comparing
the resulting checksum to the original. As a note, this implementation has the
side effect of modifying the contents of the PDU.
Evaluation of both rfc905 and rfc1008 shows that checksum validation should
involve calculating the sum over the PDU and checking that both resulting C0 and
C1 values are zero. This behavior is enacted in the rfc1008 implementation by
calling encodecc with k = 0 (checksum offset); however, this functionality had
been omitted from the quagga implementation.
PATCH
This patch adds the ability to call the quagga's fletcher_checksum() with a
checksum offset value of 0xffff (aka FLETCHER_CHECKSUM_VALIDATE) which returns
the sum over the buffer (a value of 0 indicates a valid checksum). This is
similar to the mechanism in rfc1008 when called with k = 0. The patch also
introduces ospf_lsa_checksum_valid().
ospf6d had it's own implementation of the fletcher checksum in
ospf6_lsa_checksum(); it's the same algorithm as in fletcher_checksum(). This
patch removes the local implementation in favor of the library's as well as creates
and uses ospf6_lsa_checksum_valid().
quagga's ISIS implementation suffers from the same problem; however, I do not
have the facilities to validate a fix to ISIS, thus this change has been left to
the ISIS maintainers. The function iso_csum_verify() should be reduced to
running the fletcher checksum over the buffer using an offset of 0.
Signed-off-by: JR Rivers <jrrivers@cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: Nolan Leake <nolan@cumulusnetworks.com>
Reviewed-by: Ayan Banerjee <ayan@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Make static routes respect non-default routing tables.
BEFORE PATCH
------------
! in zebra.conf
table 1
! add static route
vtysh> ip route 10.0.0.0/30 eth0
cumulus@net-top0:~$ ip route
default via 192.168.0.2 dev eth0
10.0.0.0/30 dev eth0 proto zebra
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.15
! nothing in table 1
cumulus@net-top0:~$ ip route show table 1
AFTER PATCH
-----------
! in zebra.conf
table 1
! add static route
vtysh> ip route 10.0.0.0/30 eth0
cumulus@net-top0:~$ ip route
default via 192.168.0.2 dev eth0
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.15
! static route in table 1
cumulus@net-top0:~$ ip route show table 1
10.0.0.0/30 dev eth0 proto zebra
Signed-off-by: Nolan Leake <nolan@cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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This reverts commit 9289c6ff55cd96c943d23e43fc9e5f987aa965ed.
The commit reverted an earlier change which was fixed a bug that caused
black-holes to remote destinations with multiple paths, that could occur
during convergence. Overall, the previous code is more correct.
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* lib/table.[ch]
- Add a function (route_table_get_next()) to get the route_node in
a tree that succeeds a given prefix in iteration order.
This allows one to reliably walk nodes in a tree while allowing
modifications, and is useful for achieving scale and
performance. Other approaches are also possible -- the main plus
point of this one is that it does not require any state about
the walk to be maintained in the table data structures.
- Add an iterator for walking the nodes in a tree. This introduces
a new structure (route_table_iter_t) and the following main
functions.
route_table_iter_init()
route_table_iter_pause()
route_table_iter_next()
route_table_iter_cleanup()
The iterator normally uses node pointers and the existing
route_next() function to walk nodes efficiently. When an
iteration is 'paused' with route_table_iter_pause(), it stores
the last prefix processed. The next call to
route_table_iter_next() transparently invokes
route_table_get_next() with the prefix to resume iteration.
* bgpd/bgp_table.[ch]
Add wrappers for the new table features described above.
* tests/table_test.c
Add tests for the new table code.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Make the BGP table code a thin wrapper around the table implementation
in libzebra.
* bgpd/bgp_table.[ch]
- Use the ROUTE_NODE_FIELDS macro to embed the fields of a
route_node in the bgp_node structure.
- Add a route_table field to the bgp_table structure.
Initialize the route_table with a delegate, such that the nodes
in the table are bgp_node structures.
- Add inline wrappers that call route_table functions underneath,
and accept/return the correct BGP types.
* bgpd/bgp_route.c
Change some code to use inline wrappers instead of accessing
fields of nodes/tables directly. The latter does not always work
because the types of some fields need to be translated now.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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