Currently, under the conditions specified below, IPv6 ingress packet
processing can ignore blackhole/reject flag on the prefix. The packet
will instead be looped locally till TTL expiration and a single ICMPv6
unreachable message will be send to the source even in case of
RTF_BLACKHOLE.
The following conditions needs hold to make the scenario happen:
* IPv6 forwarding is enabled
* Packet is not fast-forwarded
* Destination prefix has either RTF_BLACKHOLE or RTF_REJECT flag
Fix this behavior by checking for the blackhole/reject flags in
ip6_forward().
Reported by: Dmitriy Smirnov <fox@sage.su>
Reviewed by: ae
Differential Revision: https://reviews.freebsd.org/D38164
MFC after: 3 days
nd6_resolve_slow() can be called without mbuf. If the LLE entry
is not reachable, nd6_resolve_slow() will add this NULL mbuf to
the holdchain via lltable_append_entry_queue, which will "append"
NULL to the end of the queue (effectively no-op) and bump la_numhold
value. When this entry gets freed, the kernel will panic due to the
inconsistency between the amount of mbufs in the queue and the value
of la_numhold.
Fix the panic by checking of mbuf is not NULL prior to inserting it
into the holdchain.
Reported by: kib
MFC after: 3 days
mli_delete_locked() is the only function that takes a const ifnet.
Since it's a static function there's no advantage to keeping it const.
Since `if_t` is not a const struct (currently) the compiler throws an
error passing the ifp around to ifnet functions.
Fixes: eb1da3e525
Sponsored by: Juniper Networks, Inc.
They are shared between UDP over IPv4 and over IPv6. To prevent all
possible kernel build failures wrap them in #ifdef _SYS_PROTOSW_H_.
Prompted by feedback from jhb@ and jrtc27@ on c93db4abf4.
For the TCP protocol inpcb storage specify allocation size that would
provide space to most of the data a TCP connection needs, embedding
into struct tcpcb several structures, that previously were allocated
separately.
The most import one is the inpcb itself. With embedding we can provide
strong guarantee that with a valid TCP inpcb the tcpcb is always valid
and vice versa. Also we reduce number of allocs/frees per connection.
The embedded inpcb is placed in the beginning of the struct tcpcb,
since in_pcballoc() requires that. However, later we may want to move
it around for cache line efficiency, and this can be done with a little
effort. The new intotcpcb() macro is ready for such move.
The congestion algorithm data, the TCP timers and osd(9) data are
also embedded into tcpcb, and temprorary struct tcpcb_mem goes away.
There was no extra allocation here, but we went through extra pointer
every time we accessed this data.
One interesting side effect is that now TCP data is allocated from
SMR-protected zone. Potentially this allows the TCP stacks or other
TCP related modules to utilize that for their own synchronization.
Large part of the change was done with sed script:
s/tp->ccv->/tp->t_ccv./g
s/tp->ccv/\&tp->t_ccv/g
s/tp->cc_algo/tp->t_cc/g
s/tp->t_timers->tt_/tp->tt_/g
s/CCV\(ccv, osd\)/\&CCV(ccv, t_osd)/g
Dependency side effect is that code that needs to know struct tcpcb
should also know struct inpcb, that added several <netinet/in_pcb.h>.
Differential revision: https://reviews.freebsd.org/D37127
If udp[6]_append() returns non-zero, it is because the inp has gone
away (inpcbrele_rlocked returned 1 after running the tunnel function).
Reviewed by: ae
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D37511
Currently SO_REUSEPORT_LB silently does nothing when set by a jailed
process. It is trivial to support this option in VNET jails, but it's
also useful in traditional jails.
This patch enables LB groups in jails with the following semantics:
- all PCBs in a group must belong to the same jail,
- PCB lookup prefers jailed groups to non-jailed groups
This is a straightforward extension of the semantics used for individual
listening sockets. One pre-existing quirk of the lbgroup implementation
is that non-jailed lbgroups are searched before jailed listening
sockets; that is preserved with this change.
Discussed with: glebius
MFC after: 1 month
Sponsored by: Modirum MDPay
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37029
It is ok to use memcmp() in the kernel. No functional change intended.
Reviewed by: glebius, melifaro
MFC after: 1 week
Sponsored by: Modirum MDPay
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37028
Some auditing of the code shows that "cred" is never non-NULL in these
functions, either because all callers pass a non-NULL reference or
because they unconditionally dereference "cred". So, let's simplify the
code a bit and remove NULL checks. No functional change intended.
Reviewed by: glebius
MFC after: 1 week
Sponsored by: Modirum MDPay
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37025
This commit brings back the driver from FreeBSD commit
f187d6dfbf plus subsequent fixes from
upstream.
Relative to upstream this commit includes a few other small fixes such
as additional INET and INET6 #ifdef's, #include cleanups, and updates
for recent API changes in main.
Reviewed by: pauamma, gbe, kevans, emaste
Obtained from: git@git.zx2c4.com:wireguard-freebsd @ 3cc22b2
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36909
Mechanically cleanup INP_TIMEWAIT from the kernel sources. After
0d7445193a, this commit shall not cause any functional changes.
Note: this flag was very often checked together with INP_DROPPED.
If we modify in_pcblookup*() not to return INP_DROPPED pcbs, we
will be able to remove most of this checks and turn them to
assertions. Some of them can be turned into assertions right now,
but that should be carefully done on a case by case basis.
Differential revision: https://reviews.freebsd.org/D36400
The memory savings the tcptw brought back in 2003 (see 340c35de6a) no
longer justify the complexity required to maintain it. For longer
explanation please check out the email [1].
Surpisingly through almost 20 years the TCP stack functionality of
handling the TIME_WAIT state with a normal tcpcb did not bitrot. The
existing tcp_input() properly handles a tcpcb in TCPS_TIME_WAIT state,
which is confirmed by the packetdrill tcp-testsuite [2].
This change just removes tcptw and leaves INP_TIMEWAIT. The flag will
be removed in a separate commit. This makes it easier to review and
possibly debug the changes.
[1] https://lists.freebsd.org/archives/freebsd-net/2022-January/001206.html
[2] https://github.com/freebsd-net/tcp-testsuite
Differential revision: https://reviews.freebsd.org/D36398
When system acts as CARP BACKUP ignore received IPv6 Neighbor Advertisements
to ensure that neighbor cache will not be changed.
Also do not send IPv6 Neighbor Solicitation from CARP BACKUP source address.
Such packets can confuse network switch and it detects MAC addresses
flapping.
Obtained from: Yandex LLC
MFC after: 2 weeks
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D36649
In the original design of the network stack from the protocol control
input method pr_ctlinput was used notify the protocols about two very
different kinds of events: internal system events and receival of an
ICMP messages from outside. These events were coded with PRC_ codes.
Today these methods are removed from the protosw(9) and are isolated
to IPv4 and IPv6 stacks and are called only from icmp*_input(). The
PRC_ codes now just create a shim layer between ICMP codes and errors
or actions taken by protocols.
- Change ipproto_ctlinput_t to pass just pointer to ICMP header. This
allows protocols to not deduct it from the internal IP header.
- Change ip6proto_ctlinput_t to pass just struct ip6ctlparam pointer.
It has all the information needed to the protocols. In the structure,
change ip6c_finaldst fields to sockaddr_in6. The reason is that
icmp6_input() already has this address wrapped in sockaddr, and the
protocols want this address as sockaddr.
- For UDP tunneling control input, as well as for IPSEC control input,
change the prototypes to accept a transparent union of either ICMP
header pointer or struct ip6ctlparam pointer.
- In icmp_input() and icmp6_input() do only validation of ICMP header and
count bad packets. The translation of ICMP codes to errors/actions is
done by protocols.
- Provide icmp_errmap() and icmp6_errmap() as substitute to inetctlerrmap,
inet6ctlerrmap arrays.
- In protocol ctlinput methods either trust what icmp_errmap() recommend,
or do our own logic based on the ICMP header.
Differential revision: https://reviews.freebsd.org/D36731
Now these functions are called only from icmp*_input(). The pointer
to the ICMP data is never NULL and cmd has a limited set of values.
In the past the functions were demultiplexing control messages from
ICMP layer, as well as internally generated events. In the latter
case the the pointer to IP would be NULL.
Differential revision: https://reviews.freebsd.org/D36729
and mark those PRC_* codes, that are used. The rest are dead code.
This is not a functional change, but illustrative to make easier
review of following changes.
After decoupling of protosw(9) and IP wire protocols in 78b1fc05b2 for
IPv4 we got vector ip_ctlprotox[] that is executed only and only from
icmp_input() and respectively for IPv6 we got ip6_ctlprotox[] executed
only and only from icmp6_input(). This allows to use protocol specific
argument types in these methods instead of struct sockaddr and void.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36727
The netinet/ipprotosw.h and netinet6/ip6protosw.h were KAME relics, with
the former removed in f0ffb944d2 in 2001 and the latter survived until
today. It has been reduced down to only one useful declaration that
moves to ip6_var.h
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36726
Summary:
Move SIOCAIFADDR_IN6 (current "primary" ioctl to add an IPv6
interface address) handling code to the dedicated in6_addifaddr()
function and make it a part of KPI. This allows in-kernel users to
add/delete interfaces addresses without relying on ioctl interface.
Subscribers: imp, ae, glebius
Differential Revision: https://reviews.freebsd.org/D36713
It is now unused and not having it allows further clean ups.
Reviewed by: cy, glebius, kp
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D36452
Fix nd6_na_input() eventhandler call: run eventhandler after lle
state transition.
Old behaviour (as seen by event handler):
* fe80::5054:ff:fe8c:63e9 dev vtnet0 lladdr 52:54:00:8c:63:e9 INCOMPLETE
New behaviour:
* fe80::5054:ff:fe8c:63e9 dev vtnet0 lladdr 52:54:00:8c:63:e9 REACHABLE
MFC after: 2 weeks
With 61f7427f02 raw sockets protosw has wildcard pr_protocol. Protocol
of a specific pcb is stored in inp_ip_p.
Reviewed by: karels
Reported by: karels
Differential revision: https://reviews.freebsd.org/D36429
Fixes: 61f7427f02
Since 4.4BSD the protosw was used to implement socket types created
by socket(2) syscall and at the same to demultiplex incoming IPv4
datagrams (later copied to IPv6). This story ended with 78b1fc05b2.
These entries (e.g. IPPROTO_ICMP) in inetsw that were added to catch
packets in ip_input(), they would also be returned by pffindproto()
if user says socket(AF_INET, SOCK_RAW, IPPROTO_ICMP). Thus, for raw
sockets to work correctly, all the entries were pointing at raw_usrreq
differentiating only in the value of pr_protocol.
With 78b1fc05b2 all these entries are no longer needed, as ip_protox
is independent of protosw. Any socket syscall requesting SOCK_RAW type
would end up with rip_protosw. And this protosw has its pr_protocol
set to 0, allowing to mark socket with any protocol.
For IPv6 raw socket the change required two small fixes:
o Validate user provided protocol value
o Always use protocol number stored in inp in rip6_attach, instead
of protosw value, which is now always 0.
Differential revision: https://reviews.freebsd.org/D36380
The divert(4) is not a protocol of IPv4. It is a socket to
intercept packets from ipfw(4) to userland and re-inject them
back. It can divert and re-inject IPv4 and IPv6 packets today,
but potentially it is not limited to these two protocols. The
IPPROTO_DIVERT does not belong to known IP protocols, it
doesn't even fit into u_char. I guess, the implementation of
divert(4) was done the way it is done basically because it was
easier to do it this way, back when protocols for sockets were
intertwined with IP protocols and domains were statically
compiled in.
Moving divert(4) out of inetsw accomplished two important things:
1) IPDIVERT is getting much closer to be not dependent on INET.
This will be finalized in following changes.
2) Now divert socket no longer aliases with raw IPv4 socket.
Domain/proto selection code won't need a hack for SOCK_RAW and
multiple entries in inetsw implementing different flavors of
raw socket can merge into one without requirement of raw IPv4
being the last member of dom_protosw.
Differential revision: https://reviews.freebsd.org/D36379
Construct the desired hexthops directly instead of using the
"translation" layer in form of filling rt_addrinfo data.
Simplify V_rt_add_addr_allfibs handling by using recently-added
rib_copy_route() to propagate the routes to the non-primary address
fibs.
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D36166
Summary:
Currently netinet6/ code allocates IPv6 prefixes (nd_prefix) for
both manually-assigned addresses and advertised prefixes. As a result,
prefixes from manually-assigned prefixes can be seen in `ndp -p` list
and be cleared via `ndp -P`. The latter relies on the SIOCSPFXFLUSH_IN6
ioctl to clear to prefix list.
The original intent of the SIOCSPFXFLUSH_IN6 was to clear prefixes
originated from the advertising routers:
```
1998-09-02 JINMEI, Tatuya <jinmei@isl.rdc.toshiba.co.jp>
* nd6.c (nd6_ioctl): added 2 new ioctls; SIOCSRTRFLUSH_IN6 and
SIOCSPFXFLUSH_IN6. The former is to flush all default routers
in the default router list, and the latter is to flush all the
prefixes and the addresses derived from them in the prefix list.
```
Restore the intent by marking prefixes derived from the RA messages
with newly-added ndpr_flags.ra_derived flag and skip prefixes not marked
with such flag during deletion and listing.
Differential Revision: https://reviews.freebsd.org/D36312
MFC after: 2 weeks
o Assert that every protosw has pr_attach. Now this structure is
only for socket protocols declarations and nothing else.
o Merge struct pr_usrreqs into struct protosw. This was suggested
in 1996 by wollman@ (see 7b187005d1), and later reiterated
in 2006 by rwatson@ (see 6fbb9cf860).
o Make struct domain hold a variable sized array of protosw pointers.
For most protocols these pointers are initialized statically.
Those domains that may have loadable protocols have spacers. IPv4
and IPv6 have 8 spacers each (andre@ dff3237ee5).
o For inetsw and inet6sw leave a comment noting that many protosw
entries very likely are dead code.
o Refactor pf_proto_[un]register() into protosw_[un]register().
o Isolate pr_*_notsupp() methods into uipc_domain.c
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36232
The method was called for two different conditions: 1) the VM layer is
low on pages or 2) one of UMA zones of mbuf allocator exhausted.
This change 2) into a new event handler, but all affected network
subsystems modified to subscribe to both, so this change shall not
bring functional changes under different low memory situations.
There were three subsystems still using pr_drain: TCP, SCTP and frag6.
The latter had its protosw entry for the only reason to register its
pr_drain method.
Reviewed by: tuexen, melifaro
Differential revision: https://reviews.freebsd.org/D36164
While here remove recursive network epoch entry in mld_fasttimo_vnet(),
as this function is already in epoch.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36161
Modern TCP stacks uses multiple callouts per tcpcb, and a global
callout is ancient artifact. However it is still used to garbage
collect compressed timewait entries.
Reviewed by: melifaro, tuexen
Differential revision: https://reviews.freebsd.org/D36159
The protosw KPI historically has implemented two quite orthogonal
things: protocols that implement a certain kind of socket, and
protocols that are IPv4/IPv6 protocol. These two things do not
make one-to-one correspondence. The pr_input and pr_ctlinput methods
were utilized only in IP protocols. This strange duality required
IP protocols that doesn't have a socket to declare protosw, e.g.
carp(4). On the other hand developers of socket protocols thought
that they need to define pr_input/pr_ctlinput always, which lead to
strange dead code, e.g. div_input() or sdp_ctlinput().
With this change pr_input and pr_ctlinput as part of protosw disappear
and IPv4/IPv6 get their private single level protocol switch table
ip_protox[] and ip6_protox[] respectively, pointing at array of
ipproto_input_t functions. The pr_ctlinput that was used for
control input coming from the network (ICMP, ICMPv6) is now represented
by ip_ctlprotox[] and ip6_ctlprotox[].
ipproto_register() becomes the only official way to register in the
table. Those protocols that were always static and unlikely anybody
is interested in making them loadable, are now registered by ip_init(),
ip6_init(). An IP protocol that considers itself unloadable shall
register itself within its own private SYSINIT().
Reviewed by: tuexen, melifaro
Differential revision: https://reviews.freebsd.org/D36157
Both UDP and UDP Lite use same methods on sockets. Both UDP over IPv4
and over IPv6 use same methods. Don't pretend that methods can switch
and remove this unneeded complexity.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36154
For some reason protosw.h is used during world complation and userland
is not aware of caddr_t, a relic from the first version of C. Broken
buildworld is good reason to get rid of yet another caddr_t in kernel.
Fixes: 886fc1e804
This is expensive and useless call. It has been useless since Alexander
melifaro@ moved the forwarding table to nexthops with passive invalidation.
What happens now is that cached route in a inpcb would get invalidated
on next ip_output().
These were the last users of pfctlinput(), so garbage collect it.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36156
* factor out underlying llentry check into a separate function and use it consistently
* enter epoch once instead of per-router enter/exit
* don't execute body with fibnum = `RT_ALL_FIBS`
Differential Revision: https://reviews.freebsd.org/D35523
MFC after: 2 weeks
The only place to execute this method was raw_usend(). Only those
protocols that used raw socket were able to actually enter that method.
All pr_output assignments being deleted by this commit were a dead code
for many years.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36126
destinations.
The current assumption is that kernel-handled rtadv prefixes along with
the interface address prefixes are the only prefixes considered in
the ND neighbor eligibility code.
Change this by allowing any non-gatewaye routes to be eligible. This
will allow DHCPv6-controlled routes to be correctly handled by
the ND code.
Refactor nd6_is_new_addr_neighbor() to enable more deterministic
performance in "found" case and remove non-needed
V_rt_add_addr_allfibs handling logic.
Reviewed By: kbowling
Differential Revision: https://reviews.freebsd.org/D23695
MFC after: 1 month
* Make nhgrp_get_nhops() return const struct weightened_nhop to
indicate that the list is immutable
* Make nhgrp_get_group() return the actual group, instead of
group+weight.
MFC after: 2 weeks
Currently we accept any pmtu between IPV6_MMTU(1280B) and the link mtu.
In some network topologies could allow a bad actor to perform a DOS attack.
Contrary to IPv4 in IPv6 oversized packets are dropped, and a ICMP
PACKET_TOO_BIG message is sent back to the sender.
After receiving an ICMPv6 packet with pmtu bigger than the
current one the victim will start sending frames that will be dropped
a router with reduced MTU.
Although it will eventually receive another message with correct pmtu,
an attacker can still just inject their spoofed packets frequently
enough to overwrite the correct value.
This issue is described in detail in RFC8201, section 6.
Fix this by checking the current pmtu, and accepting the new one only
if it's smaller.
Approved by: mw(mentor)
Reviewed by: tuexen
MFC after: 1 week
Sponsored by: Stormshield
Obtained from: Semihalf
Differential Revision: https://reviews.freebsd.org/D35871
With clang 15, the following -Werror warning is produced:
sys/netinet6/nd6.c:247:12: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
nd6_destroy()
^
void
This is nd6_destroy() is declared with a (void) argument list, but
defined with an empty argument list. Make the definition match the
declaration.
MFC after: 3 days
Currently, processing of IPv6 local traffic is partially broken:
link-local connection fails and global unicast connect() takes
3 seconds to complete.
This happens due to the combination of multiple factors.
IPv6 code passes original interface "origifp" when passing
traffic via loopack to retain the scope that is mandatory for the
correct hadling of link-local traffic. First problem is that the logic
of passing source interface is not working correcly for TCP connections,
resulting in passing "origifp" on the first 2 connection attempts and
lo0 on the subsequent ones. Second problem is that source address
validation logic skips its checks iff the source interface is loopback,
which doesn't cover "origifp" case.
More detailed description is available at https://reviews.freebsd.org/D35732
Fix the first problem by untangling&simplifying ifp/origifp logic.
Fix the second problem by switching source address validation check to
using M_LOOP mbuf flag instead of interface type.
PR: 265089
Reviewed by: ae, bz(previous version)
Differential Revision: https://reviews.freebsd.org/D35732
MFC after: 2 weeks
Effectively selectroute() addresses two different cases:
providing interface info for multicast destinations and providing
nexthop data for unicast ones. Current implementation intertwines
handling of both cases, especially in the error handling part.
Factor out all route lookup logic in a separate function,
lookup_route() to simplify the code.
Ensure consistent KPI: no error means *retifp is set and otherwise.
Differential Revision: https://reviews.freebsd.org/D35711
MFC after: 2 weeks
Currently selectroute() contains two nearly-identical versions of
the route lookup logic - one for original destination and another
for the case when IPV6_NEXTHOP option was set on the socket.
Factor out handling these route lookups in a separation function to
improve readability.
This change also fixes handling of link-local IPV6_NEXTHOPs.
Differential Revision: https://reviews.freebsd.org/D35710
MFC after: 2 weeks
Currently, some per-mbuf multicast statistics is stored in
the per-interface ip6stat.ip6s_m2m[] array of size 32 (IP6S_M2MMAX).
Check that loopback ifindex falls within 0.. IP6S_M2MMAX-1 range to
avoid silent data corruption. The latter cat happen with large
number of VNETs.
Reviewed by: glebius
Differential Revision: https://reviews.freebsd.org/D35715
MFC after: 2 weeks
Commit d6cd20cc5 ("netinet6: fix ndp proxying") caused us to panic when
unloading pfsync:
Fatal trap 12: page fault while in kernel mode
cpuid = 19; apic id = 38
fault virtual address = 0x20
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80dfe7f4
stack pointer = 0x28:0xfffffe015d4f8ac0
frame pointer = 0x28:0xfffffe015d4f8ae0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 5477 (kldunload)
trap number = 12
panic: page fault
cpuid = 19
time = 1654023100
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe015d4f8880
vpanic() at vpanic+0x17f/frame 0xfffffe015d4f88d0
panic() at panic+0x43/frame 0xfffffe015d4f8930
trap_fatal() at trap_fatal+0x387/frame 0xfffffe015d4f8990
trap_pfault() at trap_pfault+0xab/frame 0xfffffe015d4f89f0
calltrap() at calltrap+0x8/frame 0xfffffe015d4f89f0
--- trap 0xc, rip = 0xffffffff80dfe7f4, rsp = 0xfffffe015d4f8ac0, rbp = 0xfffffe015d4f8ae0 ---
in6_purge_proxy_ndp() at in6_purge_proxy_ndp+0x14/frame 0xfffffe015d4f8ae0
if_purgeaddrs() at if_purgeaddrs+0x24/frame 0xfffffe015d4f8b90
if_detach_internal() at if_detach_internal+0x1c2/frame 0xfffffe015d4f8bf0
if_detach() at if_detach+0x71/frame 0xfffffe015d4f8c20
pfsync_clone_destroy() at pfsync_clone_destroy+0x1dd/frame 0xfffffe015d4f8c70
if_clone_destroyif() at if_clone_destroyif+0x239/frame 0xfffffe015d4f8cc0
if_clone_detach() at if_clone_detach+0xc8/frame 0xfffffe015d4f8cf0
vnet_pfsync_uninit() at vnet_pfsync_uninit+0xda/frame 0xfffffe015d4f8d10
vnet_deregister_sysuninit() at vnet_deregister_sysuninit+0x85/frame 0xfffffe015d4f8d40
linker_file_sysuninit() at linker_file_sysuninit+0x147/frame 0xfffffe015d4f8d70
linker_file_unload() at linker_file_unload+0x269/frame 0xfffffe015d4f8db0
kern_kldunload() at kern_kldunload+0x18d/frame 0xfffffe015d4f8e00
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe015d4f8f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe015d4f8f30
--- syscall (444, FreeBSD ELF64, sys_kldunloadf), rip = 0x1601eab28cba, rsp = 0x1601e9c363f8, rbp = 0x1601e9c36c50 ---
This happens because ifp->if_afdata[AF_INET6] is NULL. Check for this,
just as we already do in a few other places.
See also c139b3c19b ("arp/nd: Cope with late calls to
iflladdr_event").
Reviewed by: melifaro
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D35374
Mbufs leak when manually removing incomplete NDP records with pending packet via ndp -d.
It happens because lltable_drop_entry_queue() rely on `la_numheld`
counter when dropping NDP entries (lles). It turned out NDP code never
increased `la_numheld`, so the actual free never happened.
Fix the issue by introducing unified lltable_append_entry_queue(),
common for both ARP and NDP code, properly addressing packet queue
maintenance.
Reviewed By: melifaro
Differential Revision: https://reviews.freebsd.org/D35365
MFC after: 2 weeks
We could insert proxy NDP entries by the ndp command, but the host
with proxy ndp entries had not responded to Neighbor Solicitations.
Change the following points for proxy NDP to work as expected:
* join solicited-node multicast addresses for proxy NDP entries
in order to receive Neighbor Solicitations.
* look up proxy NDP entries not on the routing table but on the
link-level address table when receiving Neighbor Solicitations.
Reviewed By: melifaro
Differential Revision: https://reviews.freebsd.org/D35307
MFC after: 2 weeks
In order to decrease ifdef INET/INET6s in the lltable implementation,
introduce the llt_post_resolved callback and implement protocol-dependent
code in the protocol-dependent part.
Reviewed By: melifaro
Differential Revision: https://reviews.freebsd.org/D35322
MFC after: 2 weeks
Implement the same filter feature we implemented for UDP over IPv6 in
742e7210d. This was missed in that commit.
Pointed out by: markj
Sponsored by: Rubicon Communications, LLC ("Netgate")
mld_domifattach() does a memory allocation under the global MLD mutex
and so can fail, but no error handling prevents a null pointer
dereference in this case. The mutex is only needed when updating the
global softc list; the allocation and static initialization of the softc
does not require this mutex. So, reduce the scope of the mutex and use
M_WAITOK for the allocation.
PR: 261457
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34943
Allow udp tunnel functions to indicate they have not taken ownership of
the packet, and that normal UDP processing should continue.
This is especially useful for scenarios where the kernel has taken
ownership of a socket that was originally created by userspace. It
allows the tunnel function to pass through certain packets for userspace
processing.
The primary user of this is if_ovpn, when it receives messages from
unknown peers (which might be a new client).
Reviewed by: tuexen
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D34883
For IPv4 use dst pointer as destination address in fib4_lookup().
It keeps destination address from IPv4 header and can be changed
when PACKET_TAG_IPFORWARD tag was set by packet filter.
For IPv6 override destination address with address from dst_sa.sin6_addr,
that was set from PACKET_TAG_IPFORWARD tag.
Reviewed by: eugen
MFC after: 1 week
PR: 256828, 261697, 255705
Differential Revision: https://reviews.freebsd.org/D34732
Also convert raw epoch_call() calls to lltable_free_entry() calls, no
functional change intended. There's no need to asynchronously free the
LLEs in that case to begin with, but we might as well use the lltable
interfaces consistently.
Noticed by code inspection; I believe lltable_calc_llheader() failures
do not generally happen in practice.
Reviewed by: bz
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34832
Historically, lltable_try_set_entry_addr() would release the LLE lock
upon failure. After some refactoring, it no longer does so, but
consumers were not adjusted accordingly.
Also fix a leak that can occur if lltable_calc_llheader() fails in the
ARP code, but I suspect that such a failure can only occur due to a code
bug.
Reviewed by: bz, melifaro
Reported by: pho
Fixes: 0b79b007eb ("[lltable] Restructure nd6 code.")
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34831
For nallow and nblock, move the variables under #ifdef KTR.
For return values from functions logged in KTR traces, mark the
variables as __unused rather than having to #ifdef the assignment of
the function return value.
When ip_output_send() returns EAGAIN due to issues with send tags (route
change, lagg failover, etc), it must free the mbuf. This is because
ip_output_send() was written as a wrapper/replacement for a direct
call to if_output(), and the contract with if_output() has
historically been that it owns the mbufs once called. When
ip_output_send() failed to free mbufs, it violated this assumption
and lead to leaked mbufs.
This was noticed when using NIC TLS in combination with hardware
rate-limited connections. When seeing lots of NIC output drops
triggered ratelimit send tag changes, we noticed we were leaking
ktls_sessions, send tags and mbufs. This was due ip_output_send()
leaking mbufs which held references to ktls_sessions, which in
turn held references to send tags.
Many thanks to jbh, rrs, hselasky and markj for their help in
debugging this.
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D34054
Reviewed by: hselasky, jhb, rrs
MFC after: 2 weeks
When sending an NS, check if we are using a IPv6 CARP address
and if we do, then put proper CARP link level address into
ND_OPT_SOURCE_LINKADDR option and also put PACKET_TAG_CARP tag
on the packet. The latter will enforce CARP link level address
at the data link layer too, which might be necessary for broken
implementations.
The code really follows what NA sending code has been doing since
introduction of carp(4). While here, bring to style(9) the whole
block of code.
PR: 193280
Differential revision: https://reviews.freebsd.org/D33858
Now that each module handles its global and VNET initialization
itself, there is no VNET related stuff left to do in domain_init().
Differential revision: https://reviews.freebsd.org/D33541
The historical BSD network stack loop that rolls over domains and
over protocols has no advantages over more modern SYSINIT(9).
While doing the sweep, split global and per-VNET initializers.
Getting rid of pr_init allows to achieve several things:
o Get rid of ifdef's that protect against double foo_init() when
both INET and INET6 are compiled in.
o Isolate initializers statically to the module they init.
o Makes code easier to understand and maintain.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D33537
Allow the resending of DATA chunks to be controlled by the caller,
which allows retiring sctp_mtu_size_reset() in a separate commit.
Also improve the computaion of the overhead and use 32-bit integers
consistently.
Thanks to Timo Voelker for pointing me to the code.
MFC after: 3 days
Introduce a new function, lltable_get(), to retrieve lltable pointer
for the specified interface and family.
Use it to avoid all-iftable list traversal when adding or deleting
ARP/ND records.
Differential Revision: https://reviews.freebsd.org/D33660
MFC after: 2 weeks
