Commit Graph

14 Commits

Author SHA1 Message Date
Pedro F. Giffuni
fe267a5590 sys: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:23:17 +00:00
Kristof Provost
7f3ad01804 pf_get_sport(): Prevent possible endless loop when searching for an unused nat port
This is an import of Alexander Bluhm's OpenBSD commit r1.60,
the first chunk had to be modified because on OpenBSD the
'cut' declaration is located elsewhere.

Upstream report by Jingmin Zhou:
https://marc.info/?l=openbsd-pf&m=150020133510896&w=2

OpenBSD commit message:
 Use a 32 bit variable to detect integer overflow when searching for
 an unused nat port.  Prevents a possible endless loop if high port
 is 65535 or low port is 0.
 report and analysis Jingmin Zhou; OK sashan@ visa@
Quoted from: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/net/pf_lb.c

PR:		221201
Submitted by:	Fabian Keil <fk@fabiankeil.de>
Obtained from:  OpenBSD via ElectroBSD
MFC after:	1 week
2017-08-08 21:09:26 +00:00
Kristof Provost
98a9874f7b pf: Fix a crash in low-memory situations
If the call to pf_state_key_clone() in pf_get_translation() fails (i.e. there's
no more memory for it) it frees skp. This is wrong, because skp is a
pf_state_key **, so we need to free *skp, as is done later in the function.
Getting it wrong means we try to free a stack variable of the calling
pf_test_rule() function, and we panic.
2017-03-06 23:41:23 +00:00
Gleb Smirnoff
e85343b1a5 Do not lookup source node twice when pf_map_addr() is used.
PR:		184003
Submitted by:	Kajetan Staszkiewicz <vegeta tuxpowered.net>
Sponsored by:	InnoGames GmbH
2014-08-15 14:16:08 +00:00
Gleb Smirnoff
79bde95f51 Backout r257223,r257224,r257225,r257246,r257710. The changes caused
some regressions in ICMP handling, and right now me and Baptiste
are out of time on analyzing them.

PR:		188253
2014-04-16 09:25:20 +00:00
Gleb Smirnoff
a830c4524d When pf_get_translation() fails, it should leave *sn pointer pristine,
otherwise we will panic in pf_test_rule().

PR:		182557
2014-01-06 19:05:04 +00:00
Gleb Smirnoff
e4e01d9cec Some fixups to pf_get_sport after r257223:
- Do not return blindly if proto isn't ICMP.
- The dport is in network order, so fix comparisons.
- Remove ridiculous htonl(arc4random()).
- Push local variable to a narrower block.
2013-11-14 14:20:35 +00:00
Baptiste Daroussin
44df0d9356 Import pf.c 1.635 and pf_lb.c 1.4 from OpenBSD
Stricter state checking for ICMP and ICMPv6 packets: include the ICMP type

in one port of the state key, using the type to determine which
side should be the id, and which should be the type. Also:
- Handle ICMP6 messages which are typically sent to multicast
  addresses but recieve unicast replies, by doing fallthrough lookups
  against the correct multicast address.  - Clear up some mistaken
  assumptions in the PF code:
- Not all ICMP packets have an icmp_id, so simulate
  one based on other data if we can, otherwise set it to 0.
  - Don't modify the icmp id field in NAT unless it's echo
  - Use the full range of possible id's when NATing icmp6 echoy

Difference with OpenBSD version:
- C99ify the new code
- WITHOUT_INET6 safe

Reviewed by:	glebius
Obtained from:	OpenBSD
2013-10-27 20:44:42 +00:00
Gleb Smirnoff
75bf2db380 Move new pf includes to the pf directory. The pfvar.h remain
in net, to avoid compatibility breakage for no sake.

The future plan is to split most of non-kernel parts of
pfvar.h into pf.h, and then make pfvar.h a kernel only
include breaking compatibility.

Discussed with:		bz
2013-10-27 16:25:57 +00:00
Gleb Smirnoff
76039bc84f The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare
to this event, adding if_var.h to files that do need it. Also, include
all includes that now are included due to implicit pollution via if_var.h

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.
2013-10-26 17:58:36 +00:00
Gleb Smirnoff
8fc6e19c2c Merge 1.12 of pf_lb.c from OpenBSD, with some changes. Original commit:
date: 2010/02/04 14:10:12;  author: sthen;  state: Exp;  lines: +24 -19;
  pf_get_sport() picks a random port from the port range specified in a
  nat rule. It should check to see if it's in-use (i.e. matches an existing
  PF state), if it is, it cycles sequentially through other ports until
  it finds a free one. However the check was being done with the state
  keys the wrong way round so it was never actually finding the state
  to be in-use.

  - switch the keys to correct this, avoiding random state collisions
  with nat. Fixes PR 6300 and problems reported by robert@ and viq.

  - check pf_get_sport() return code in pf_test(); if port allocation
  fails the packet should be dropped rather than sent out untranslated.

  Help/ok claudio@.

Some additional changes to 1.12:

- We also need to bzero() the key to zero padding, otherwise key
  won't match.
- Collapse two if blocks into one with ||, since both conditions
  lead to the same processing.
- Only naddr changes in the cycle, so move initialization of other
  fields above the cycle.
- s/u_intXX_t/uintXX_t/g

PR:		kern/181690
Submitted by:	Olivier Cochard-Labbé <olivier cochard.me>
Sponsored by:	Nginx, Inc.
2013-09-02 10:14:25 +00:00
Gleb Smirnoff
d8aa10cc35 In netpfil/pf:
- Add my copyright to files I've touched a lot this year.
  - Add dash in front of all copyright notices according to style(9).
  - Move $OpenBSD$ down below copyright notices.
  - Remove extra line between cdefs.h and __FBSDID.
2012-12-28 09:19:49 +00:00
Gleb Smirnoff
1d6139c0e4 Make ruleset anchors in pf(4) reentrant. We've got two problems here:
1) Ruleset parser uses a global variable for anchor stack.
2) When processing a wildcard anchor, matching anchors are marked.

To fix the first one:

o Allocate anchor processing stack on stack. To make this allocation
  as small as possible, following measures taken:
  - Maximum stack size reduced from 64 to 32.
  - The struct pf_anchor_stackframe trimmed by one pointer - parent.
    We can always obtain the parent via the rule pointer.
  - When pf_test_rule() calls pf_get_translation(), the former lends
    its stack to the latter, to avoid recursive allocation 32 entries.

The second one appeared more tricky. The code, that marks anchors was
added in OpenBSD rev. 1.516 of pf.c. According to commit log, the idea
is to enable the "quick" keyword on an anchor rule. The feature isn't
documented anywhere. The most obscure part of the 1.516 was that code
examines the "match" mark on a just processed child, which couldn't be
put here by current frame. Since this wasn't documented even in the
commit message and functionality of this is not clear to me, I decided
to drop this examination for now. The rest of 1.516 is redone in a
thread safe manner - the mark isn't put on the anchor itself, but on
current stack frame. To avoid growing stack frame, we utilize LSB
from the rule pointer, relying on kernel malloc(9) returning pointer
aligned addresses.

Discussed with:		dhartmei
2012-09-18 10:54:56 +00:00
Gleb Smirnoff
3b3a8eb937 o Create directory sys/netpfil, where all packet filters should
reside, and move there ipfw(4) and pf(4).

o Move most modified parts of pf out of contrib.

Actual movements:

sys/contrib/pf/net/*.c		-> sys/netpfil/pf/
sys/contrib/pf/net/*.h		-> sys/net/
contrib/pf/pfctl/*.c		-> sbin/pfctl
contrib/pf/pfctl/*.h		-> sbin/pfctl
contrib/pf/pfctl/pfctl.8	-> sbin/pfctl
contrib/pf/pfctl/*.4		-> share/man/man4
contrib/pf/pfctl/*.5		-> share/man/man5

sys/netinet/ipfw		-> sys/netpfil/ipfw

The arguable movement is pf/net/*.h -> sys/net. There are
future plans to refactor pf includes, so I decided not to
break things twice.

Not modified bits of pf left in contrib: authpf, ftp-proxy,
tftp-proxy, pflogd.

The ipfw(4) movement is planned to be merged to stable/9,
to make head and stable match.

Discussed with:		bz, luigi
2012-09-14 11:51:49 +00:00