The variable b[] is on the stack, thus cannot overlap with ipov, which
points to the heap area, so prefer memcpy() over memmove(), aka bcopy().
No functional change intended.
Reviewed by: cc, rrs, cy, #transport, #network
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D47713
The inp_route pointer should only be provided to the network
layer, when no destination address is provided. This is only
one of the conditions, where a write lock is needed.
If, for example, the route is also cached, when the socket is
unbound, problems show up, when the sendto is called, then
connect and finally send, when the route for the addresses
provided in the sendto and connect call use different outgoing
interfaces.
While there, clearly document why the write lock is taken.
Reported by: syzbot+59122d2e848087d3355a@syzkaller.appspotmail.com
Reviewed by: Peter Lei, glebius
MFC after: 3 days
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D46056
This patch provides UDP encapsulation of ESP packets over IPv6.
Ports the IPv4 code to IPv6 and adds support for IPv6 in udpencap.c
As required by the RFC and unlike in IPv4 encapsulation,
UDP checksums are calculated.
Co-authored-by: Aurelien Cazuc <aurelien.cazuc.external@stormshield.eu>
Sponsored-by: Stormshield
Sponsored-by: Wiktel
Sponsored-by: Klara, Inc.
With removal of dom_dispose method the function boils down to two
meaningful function calls: socantrcvmore() and sbrelease(). The latter is
only relevant for protocols that use generic socket buffers.
The socket I/O sx(9) lock acquisition in sorflush() is not relevant for
shutdown(2) operation as it doesn't do any I/O that may interleave with
read(2) or write(2). The socket buffer mutex acquisition inside
sbrelease() is what guarantees thread safety. This sx(9) acquisition in
soshutdown() can be tracked down to 4.4BSD times, where it used to be
sblock(), and it was carried over through the years evolving together with
sockets with no reconsideration of why do we carry it over. I can't tell
if that sblock() made sense back then, but it doesn't make any today.
Reviewed by: tuexen
Differential Revision: https://reviews.freebsd.org/D43415
Disassemble a one-for-all soshutdown() into protocol specific methods.
This creates a small amount of copy & paste, but makes code a lot more
self documented, as protocol specific method would execute only the code
that is relevant to that protocol and nothing else. This also fixes a
couple recent regressions and reduces risk of future regressions. The
extended KPI for the new pr_shutdown removes need for the extra pr_flush
which was added for the sake of SCTP which could not perform its shutdown
properly with the old one. Particularly for SCTP this change streamlines
a lot of code.
Some notes on why certain parts of code were copied or were not to certain
protocols:
* The (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING) check is
needed only for those protocols that may be connected or disconnected.
* The above reduces into only SS_ISCONNECTED for those protocols that
always connect instantly.
* The ENOTCONN and continue processing hack is left only for datagram
protocols.
* The SOLISTENING(so) block is copied to those protocols that listen(2).
* sorflush() on SHUT_RD is copied almost to every protocol, but that
will be refactored later.
* wakeup(&so->so_timeo) is copied to protocols that can make a non-instant
connect(2), can SO_LINGER or can accept(2).
There are three protocols (netgraph(4), Bluetooth, SDP) that did not have
pr_shutdown, but old soshutdown() would still perform sorflush() on
SHUT_RD for them and also wakeup(9). Those protocols partially supported
shutdown(2) returning EOPNOTSUP for SHUT_WR/SHUT_RDWR, now they fully lost
shutdown(2) support. I'm pretty sure netgraph(4) and Bluetooth are okay
about that and SDP is almost abandoned anyway.
Reviewed by: tuexen
Differential Revision: https://reviews.freebsd.org/D43413
Do not use the cached route if the destination isn't the same.
This fix a problem where an UDP packet will be sent via the wrong route
and interface if a previous one was sent via them.
PR: 275774
Reviewed by: glebius, tuexen
Sponsored by: Beckhoff Automation GmbH & Co. KG
First, merge in_pcbdetach() with in_pcbfree(). The comment for
in_pcbdetach() was no longer correct. Then, make sure we remove
the inpcb from the hash before we commit any destructive actions
on it. There are couple functions that rely on the hash lock
skipping SMR + inpcb lock to lookup an inpcb. Although there are
no known functions that similarly rely on the global inpcb list
lock, also do list removal before destructive actions.
PR: 273890
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D43122
Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.
Sponsored by: Netflix
This patch allows the IPPROTO_UDPLITE-level socket options
UDPLITE_SEND_CSCOV and UDPLITE_RECV_CSCOV to be used on
AF_INET6 sockets in addition to AF_INET sockets.
Reviewed by: ae, rscheff
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42430
Don't fill the fields of the UDP/IP header not used for the
checksum computation before performing the checksum computation.
Reviewed by: glebius
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42275
Do the cast from sockaddr to either IPv4 or IPv6 sockaddr in the
protocol's pr_bind method and from there on go down the call
stack with family specific argument.
Reviewed by: zlei, melifaro, markj
Differential Revision: https://reviews.freebsd.org/D38601
Do the cast from sockaddr to either IPv4 or IPv6 sockaddr in the
protocol's pr_connect method and from there on go down the call
stack with family specific argument.
Reviewed by: markj
Differential revision: https://reviews.freebsd.org/D38356
All callers of in_pcbdisconnect() clear the local address, so let's just
do that in the function itself.
Note that the inp's local address is not a parameter to the inp hash
functions. No functional change intended.
Reviewed by: glebius
MFC after: 2 weeks
Sponsored by: Klara, Inc.
Sponsored by: Modirum MDPay
Differential Revision: https://reviews.freebsd.org/D38362
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.
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
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
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
With this change one can make a forward declaration of a function
that is of UDP tunneling type.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36724
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 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
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
udp_set_kernel_tunneling() rejects new callbacks if one is already set.
Allow callbacks to be cleared. The use case for this is OpenVPN DCO,
where the socket is opened by userspace and then adopted by the kernel
to run the tunnel. If the DCO interface is removed but userspace does
not close the socket (something the kernel cannot prevent) the installed
callbacks could be called with an invalidated context.
Allow new functions to be set, but only if they're NULL (i.e. allow the
callback functions to be cleared).
Reviewed by: tuexen
MFC after: 3 weeks
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D34288
Provide structure inpcbstorage, that holds zones and lock names for
a protocol. Initialize it with global protocol init using macro
INPCBSTORAGE_DEFINE(). Then, at VNET protocol init supply it as
the main argument to the in_pcbinfo_init(). Each VNET pcbinfo uses
its private hash, but they all use same zone to allocate and SMR
section to synchronize.
Note: there is kern.ipc.maxsockets sysctl, which controls UMA limit
on the socket zone, which was always global. Historically same
maxsockets value is applied also to every PCB zone. Important fact:
you can't create a pcb without a socket! A pcb may outlive its socket,
however. Given that there are multiple protocols, and only one socket
zone, the per pcb zone limits seem to have little value. Under very
special conditions it may trigger a little bit earlier than socket zone
limit, but in most setups the socket zone limit will be triggered
earlier. When VIMAGE was added to the kernel PCB zones became per-VNET.
This magnified existing disbalance further: now we have multiple pcb
zones in multiple vnets limited to maxsockets, but every pcb requires a
socket allocated from the global zone also limited by maxsockets.
IMHO, this per pcb zone limit doesn't bring any value, so this patch
drops it. If anybody explains value of this limit, it can be restored
very easy - just 2 lines change to in_pcbstorage_init().
Differential revision: https://reviews.freebsd.org/D33542
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
Sweep over potentially unsafe calls to ifnet_byindex() and wrap them
in epoch. Most of the code touched remains unsafe, as the returned
pointer is being used after epoch exit. Mark that with a comment.
Validate the index argument inside the function, reducing argument
validation requirement from the callers and making V_if_index
private to if.c.
Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D33263
This reverts commit 266f97b5e9, reversing
changes made to a10253cffe.
A mismerge of a merge to catch up to main resulted in files being
committed which should not have been.
With introduction of epoch(9) synchronization to network stack the
inpcb database became protected by the network epoch together with
static network data (interfaces, addresses, etc). However, inpcb
aren't static in nature, they are created and destroyed all the
time, which creates some traffic on the epoch(9) garbage collector.
Fairly new feature of uma(9) - Safe Memory Reclamation allows to
safely free memory in page-sized batches, with virtually zero
overhead compared to uma_zfree(). However, unlike epoch(9), it
puts stricter requirement on the access to the protected memory,
needing the critical(9) section to access it. Details:
- The database is already build on CK lists, thanks to epoch(9).
- For write access nothing is changed.
- For a lookup in the database SMR section is now required.
Once the desired inpcb is found we need to transition from SMR
section to r/w lock on the inpcb itself, with a check that inpcb
isn't yet freed. This requires some compexity, since SMR section
itself is a critical(9) section. The complexity is hidden from
KPI users in inp_smr_lock().
- For a inpcb list traversal (a pcblist sysctl, or broadcast
notification) also a new KPI is provided, that hides internals of
the database - inp_next(struct inp_iterator *).
Reviewed by: rrs
Differential revision: https://reviews.freebsd.org/D33022
In most cases blackholing for locally originated packets is undesired,
leads to different kind of lags and delays. Provide sysctls to enforce
it, e.g. for debugging purposes.
Reviewed by: rrs
Differential revision: https://reviews.freebsd.org/D32718
I should had removed it 9 years ago in 8ad458a471. That commit
left save_ip as a write-only variable.
With save_ip removed we got one case when IP header can be modified:
the calculation of IP checksum with zeroed out header. This place
already has had a header saver char b[9]. However, the b[9] saver
didn't cover the ip_sum field, which we explicitly overwrite aliased
as (struct ipovly *)->ih_len. This was fine in cb34210012, since
checksum doesn't need to be restored if packet is consumed. Now we
need to extend up to ip_sum field.
In collaboration with: ae
Differential revision: https://reviews.freebsd.org/D32719
