Commit Graph

277 Commits

Author SHA1 Message Date
Alexander V. Chernikov
e3bf606c5d Revert r358858 as it breaks some ipfw(8) setups.
Reported by:	O. Hartmann <o.hartmann@walstatt.org>
2020-03-11 08:08:53 +00:00
Alexander V. Chernikov
8149b12da1 Don't assume !IPv6 is IPv4 in ipfw(8) add_src() and add_dst().
Submitted by:	Neel Chauhan <neel AT neelc DOT org>
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21812
2020-03-10 20:30:21 +00:00
Kyle Evans
c144616b7d ipfw: fix jail option after r348215
r348215 changed jail_getid(3) to validate passed-in jids as active jails
(as the function is documented to return -1 if the jail does not exist).
This broke the jail option (in some cases?) as the jail historically hasn't
needed to exist at the time of rule parsing; jids will get stored and later
applied.

Fix this caller to attempt to parse *av as a number first and just use it
as-is to match historical behavior. jail_getid(3) must still be used in
order for name arguments to work, but it's strictly a fallback in case we
weren't given a number.

Reported and tested by:	Ari Suutari <ari stonepile fi>
Reviewed by:	ae
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D21128
2019-08-05 00:08:25 +00:00
Andrey V. Elsukov
55507128b9 Restore ipfw(8)'s compact output support broken after r331668.
Also modify it a bit. Now -c option omits only 'from any to any' part
and works for different protocols (not just for ip).

Reported by:	Dmitry Selivanov <dseliv at gmail>
MFC after:	1 week
2019-06-25 09:08:24 +00:00
Andrey V. Elsukov
978f2d1728 Add "tcpmss" opcode to match the TCP MSS value.
With this opcode it is possible to match TCP packets with specified
MSS option, whose value corresponds to configured in opcode value.
It is allowed to specify single value, range of values, or array of
specific values or ranges. E.g.

 # ipfw add deny log tcp from any to any tcpmss 0-500

Reviewed by:	melifaro,bcr
Obtained from:	Yandex LLC
MFC after:	1 week
Sponsored by:	Yandex LLC
2019-06-21 10:54:51 +00:00
Andrey V. Elsukov
761618de05 Handle HAVE_PROTO flag and print "proto" keyword for O_IP4 and O_IP6
opcodes when it is needed.
This should fix the problem, when printed by `ipfw show` rule could not
be added due to missing "proto" keyword.

MFC after:	2 weeks
2019-04-29 09:52:53 +00:00
Andrey V. Elsukov
5c04f73e07 Add NAT64 CLAT implementation as defined in RFC6877.
CLAT is customer-side translator that algorithmically translates 1:1
private IPv4 addresses to global IPv6 addresses, and vice versa.
It is implemented as part of ipfw_nat64 kernel module. When module
is loaded or compiled into the kernel, it registers "nat64clat" external
action. External action named instance can be created using `create`
command and then used in ipfw rules. The create command accepts two
IPv6 prefixes `plat_prefix` and `clat_prefix`. If plat_prefix is ommitted,
IPv6 NAT64 Well-Known prefix 64:ff9b::/96 will be used.

  # ipfw nat64clat CLAT create clat_prefix SRC_PFX plat_prefix DST_PFX
  # ipfw add nat64clat CLAT ip4 from IPv4_PFX to any out
  # ipfw add nat64clat CLAT ip6 from DST_PFX to SRC_PFX in

Obtained from:	Yandex LLC
Submitted by:	Boris N. Lytochkin
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Yandex LLC
2019-03-18 11:44:53 +00:00
Andrey V. Elsukov
a5178bca19 Allow use underscores and dots in service names without escaping.
PR:		234237
MFC after:	1 week
2018-12-21 10:41:45 +00:00
Andrey V. Elsukov
a895c1c28a Rework how protocol number is tracked in rule. Save it when O_PROTO
opcode will be printed. This should solve the problem, when protocol
name is not printed in `ipfw -N show`.

Reported by:	Claudio Eichenberger <cei at yourshop.com>
MFC after:	1 week
2018-12-10 16:23:11 +00:00
Andrey V. Elsukov
5f9c94c592 Use correct size for IPv4 address in gethostbyaddr().
When u_long is 8 bytes, it returns EINVAL and 'ipfw -N show' doesn't work.

Reported by:	Claudio Eichenberger <cei at yourshop.com>
MFC after:	1 week
2018-12-10 15:42:13 +00:00
Andrey V. Elsukov
d66f9c86fa Add ability to request listing and deleting only for dynamic states.
This can be useful, when net.inet.ip.fw.dyn_keep_states is enabled, but
after rules reloading some state must be deleted. Added new flag '-D'
for such purpose.

Retire '-e' flag, since there can not be expired states in the meaning
that this flag historically had.

Also add "verbose" mode for listing of dynamic states, it can be enabled
with '-v' flag and adds additional information to states list. This can
be useful for debugging.

Obtained from:	Yandex LLC
MFC after:	2 months
Sponsored by:	Yandex LLC
2018-12-04 16:12:43 +00:00
Andrey V. Elsukov
427dc1f755 Use correct format specificator to print setdscp action.
PR:		232642
MFC after:	3 days
2018-10-25 18:06:23 +00:00
Andrey V. Elsukov
094d6f8d75 Add IPFW_RULE_JUSTOPTS flag, that is used by ipfw(8) to mark rule,
that was added using "new rule format". And then, when the kernel
returns rule with this flag, ipfw(8) can correctly show it.

Reported by:	lev
MFC after:	3 weeks
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D17373
2018-10-21 15:10:59 +00:00
Andrey V. Elsukov
c5bf4b1bc6 Add "src-ip" or "dst-ip" keyword to the output, when we are printing the
rest of rule options.

Reported by:	lev
Approved by:	re (gjb)
MFC after:	1 week
2018-09-26 15:37:48 +00:00
Andrey V. Elsukov
f4d5e7d8b5 Restore the behaviour changed in r337536, when bad ipfw delete command
returns error.

Now -q option only makes it quiet. And when -f flag is specified, the
command will ignore errors and continue executing with next batched
command.

MFC after:	2 weeks
2018-08-10 14:10:22 +00:00
Andrey V. Elsukov
e327ad3377 If -q flag is specified, do not complain when we are trying to delete
nonexistent NAT instance or nonexistent rule.

This allows execute batched `delete` commands and do not fail when
found nonexistent rule.

Obtained from:	Yandex LLC
MFC after:	2 weeks
Sponsored by:	Yandex LLC
2018-08-09 12:46:30 +00:00
Andrey V. Elsukov
f7c4fdee1a Add "record-state", "set-limit" and "defer-action" rule options to ipfw.
"record-state" is similar to "keep-state", but it doesn't produce implicit
O_PROBE_STATE opcode in a rule. "set-limit" is like "limit", but it has the
same feature as "record-state", it is single opcode without implicit
O_PROBE_STATE opcode. "defer-action" is targeted to be used with dynamic
states. When rule with this opcode is matched, the rule's action will
not be executed, instead dynamic state will be created. And when this
state will be matched by "check-state", then rule action will be executed.
This allows create a more complicated rulesets.

Submitted by:	lev
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D1776
2018-07-09 11:35:18 +00:00
Jamie Gritton
de68a3200a Allow jail names (not just IDs) to be specified for: cpuset(1), ipfw(8),
sockstat(1), ugidfw(8)
These are the last of the jail-aware userland utilities that didn't work
 with names.

PR:		229266
MFC after:	3 days
Differential Revision:	D16047
2018-07-03 23:47:20 +00:00
Andrey V. Elsukov
51d5442fef Fix the printing of rule comments.
Change uint8_t type of opcode argument to int in the print_opcode()
function. Use negative value to print the rest of opcodes, because
zero value is O_NOP, and it can't be uses for this purpose.

Reported by:	lev
MFC after:	1 week
2018-05-10 12:25:01 +00:00
Andrey V. Elsukov
bd32e33552 Remove printing of "not" keyword from print_ip6() function.
After r331668 handling of F_NOT flag done in one place by
print_instruction() function. Also remove unused argument from
print_ip[6]() functions.

MFC after:	1 week
2018-04-12 19:44:04 +00:00
Andrey V. Elsukov
09a6be91bc Remove printing of "not" keyword from print_ip() function.
After r331668 handling of F_NOT flag done in one place by
print_instruction() function.

MFC after:	1 week
2018-04-12 19:34:35 +00:00
Andrey V. Elsukov
aed0267989 Rework ipfw rules parsing and printing code.
Introduce show_state structure to keep information about printed opcodes.
Split show_static_rule() function into several smaller functions. Make
parsing and printing opcodes into several passes. Each printed opcode
is marked in show_state structure and will be skipped in next passes.
Now show_static_rule() function is simple, it just prints each part
of rule separately: action, modifiers, proto, src and dst addresses,
options. The main goal of this change is avoiding occurrence of wrong
result of `ifpw show` command, that can not be parsed by ipfw(8).
Also now it is possible to make some simple static optimizations
by reordering of opcodes in the rule.

PR:		222705
Discussed with:	melifaro
MFC after:	2 weeks
Sponsored by:	Yandex LLC
2018-03-28 12:44:28 +00:00
Andrey V. Elsukov
c690824a91 Fix rule number truncation, use uint16_t type to specify rulenum.
PR:		224555
MFC after:	1 week
2017-12-24 01:55:12 +00:00
Pedro F. Giffuni
33d72c30f1 Revert r327005 - SPDX tags for license similar to BSD-2-Clause.
After consultation with SPDX experts and their matching guidelines[1],
the licensing doesn't exactly match the BSD-2-Clause. It yet remains to be
determined if they are equivalent or if there is a recognized license that
matches but it is safer to just revert the tags.

Let this also be a reminder that on FreeBSD, SPDX tags are only advisory
and have no legal value (but IANAL).

Pointyhat to:	pfg
Thanks to:	Rodney Grimes, Gary O'Neall

[1] https://spdx.org/spdx-license-list/matching-guidelines
2017-12-20 20:25:28 +00:00
Pedro F. Giffuni
d17aef79bb SPDX: These are fundamentally BSD-2-Clause.
They just omit the introductory line and numbering.
2017-12-19 22:40:16 +00:00
Michael Tuexen
665c8a2ee5 Add to ipfw support for sending an SCTP packet containing an ABORT chunk.
This is similar to the TCP case. where a TCP RST segment can be sent.

There is one limitation: When sending an ABORT in response to an incoming
packet, it should be tested if there is no ABORT chunk in the received
packet. Currently, it is only checked if the first chunk is an ABORT
chunk to avoid parsing the whole packet, which could result in a DOS attack.

Thanks to Timo Voelker for helping me to test this patch.
Reviewed by: bcr@ (man page part), ae@ (generic, non-SCTP part)
Differential Revision:	https://reviews.freebsd.org/D13239
2017-11-26 18:19:01 +00:00
Andrey V. Elsukov
df5be97c1a Properly initialize ipfw_range_tlv variable to fix possible EINVAL
in case when ipfw delete/zero/resetlog command issued for several rules
in the loop. Also reorder some variables by size.

PR:		218993
MFC after:	1 week
2017-05-02 01:03:59 +00:00
Andrey V. Elsukov
aac74aeac7 Add ipfw_pmod kernel module.
The module is designed for modification of a packets of any protocols.
For now it implements only TCP MSS modification. It adds the external
action handler for "tcp-setmss" action.

A rule with tcp-setmss action does additional check for protocol and
TCP flags. If SYN flag is present, it parses TCP options and modifies
MSS option if its value is greater than configured value in the rule.
Then it adjustes TCP checksum if needed. After handling the search
continues with the next rule.

Obtained from:	Yandex LLC
MFC after:	2 weeks
Relnotes:	yes
Sponsored by:	Yandex LLC
No objection from: #network
Differential Revision:	https://reviews.freebsd.org/D10150
2017-04-03 03:07:48 +00:00
Andrey V. Elsukov
11c56650f0 Add O_EXTERNAL_DATA opcode support.
This opcode can be used to attach some data to external action opcode.
And unlike to O_EXTERNAL_INSTANCE opcode, this opcode does not require
creating of named instance to pass configuration arguments to external
action handler. The data is coming just next to O_EXTERNAL_ACTION opcode.

The userlevel part currenly supports formatting for opcode with ipfw_insn
size, by default it expects u16 numeric value in the arg1.

Obtained from:	Yandex LLC
MFC after:	2 weeks
Sponsored by:	Yandex LLC
2017-04-03 02:44:40 +00:00
Andrey V. Elsukov
6ed1473867 Change the syntax of ipfw's named states.
Since the state name is an optional argument, it often can conflict
with other options. To avoid ambiguity now the state name must be
prefixed with a colon.

Obtained from:	Yandex LLC
MFC after:	2 week
Sponsored by:	Yandex LLC
2017-03-15 13:36:35 +00:00
Marius Strobl
6d3c367d9c Fix a bug in r272840; given that the optlen parameter of setsockopt(2)
is a 32-bit socklen_t, do_get3() passes the kernel to access the wrong
32-bit half on big-endian LP64 machines when simply casting the 64-bit
size_t optlen to a socklen_t pointer.
While at it and given that the intention of do_get3() apparently is to
hide/wrap the fact that socket options are used for communication with
ipfw(4), change the optlen parameter of do_set3() to be of type size_t
and as such more appropriate than uintptr_t, too.

MFC after:	3 days
2016-12-28 23:34:28 +00:00
Oleg Bulyzhin
c99ebe6c01 Fix 'ipfw delete set N':
do not emit meaningless 'rule 0 not found' warning if set was already empty.

MFC after:	1 week
2016-11-29 10:43:58 +00:00
Andrey V. Elsukov
757b5d8792 Add missing support of named lookup tables to the IPv6 code.
PR:		214419
MFC after:	1 week
Sponsored by:	Yandex LLC
2016-11-15 07:13:16 +00:00
Andrey V. Elsukov
4a2ea55b11 Add an ability to attach comment to check-state rules.
MFC after:	1 week
2016-08-14 18:34:16 +00:00
Andrey V. Elsukov
58d358e5a1 Do not warn about ambiguous state name when we inspect a comment token.
Reported by:	lev
2016-08-14 18:05:41 +00:00
Andrey V. Elsukov
d8caf56e9e Add ipfw_nat64 module that implements stateless and stateful NAT64.
The module works together with ipfw(4) and implemented as its external
action module.

Stateless NAT64 registers external action with name nat64stl. This
keyword should be used to create NAT64 instance and to address this
instance in rules. Stateless NAT64 uses two lookup tables with mapped
IPv4->IPv6 and IPv6->IPv4 addresses to perform translation.

A configuration of instance should looks like this:
 1. Create lookup tables:
 # ipfw table T46 create type addr valtype ipv6
 # ipfw table T64 create type addr valtype ipv4
 2. Fill T46 and T64 tables.
 3. Add rule to allow neighbor solicitation and advertisement:
 # ipfw add allow icmp6 from any to any icmp6types 135,136
 4. Create NAT64 instance:
 # ipfw nat64stl NAT create table4 T46 table6 T64
 5. Add rules that matches the traffic:
 # ipfw add nat64stl NAT ip from any to table(T46)
 # ipfw add nat64stl NAT ip from table(T64) to 64:ff9b::/96
 6. Configure DNS64 for IPv6 clients and add route to 64:ff9b::/96
    via NAT64 host.

Stateful NAT64 registers external action with name nat64lsn. The only
one option required to create nat64lsn instance - prefix4. It defines
the pool of IPv4 addresses used for translation.

A configuration of instance should looks like this:
 1. Add rule to allow neighbor solicitation and advertisement:
 # ipfw add allow icmp6 from any to any icmp6types 135,136
 2. Create NAT64 instance:
 # ipfw nat64lsn NAT create prefix4 A.B.C.D/28
 3. Add rules that matches the traffic:
 # ipfw add nat64lsn NAT ip from any to A.B.C.D/28
 # ipfw add nat64lsn NAT ip6 from any to 64:ff9b::/96
 4. Configure DNS64 for IPv6 clients and add route to 64:ff9b::/96
    via NAT64 host.

Obtained from:	Yandex LLC
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D6434
2016-08-13 16:09:49 +00:00
Andrey V. Elsukov
d6eb9b0249 Restore "nat global" support.
Now zero value of arg1 used to specify "tablearg", use the old "tablearg"
value for "nat global". Introduce new macro IP_FW_NAT44_GLOBAL to replace
hardcoded magic number to specify "nat global". Also replace 65535 magic
number with corresponding macro. Fix typo in comments.

PR:		211256
Tested by:	Victor Chernov
MFC after:	3 days
2016-08-11 10:10:10 +00:00
Andrey V. Elsukov
b055e3be51 Fix formatting of setfib opcode.
Zero fib is correct value and it conflicts with IP_FW_TARG.
Use bprint_uint_arg() only when opcode contains IP_FW_TARG,
otherwise just print numeric value with cleared high-order bit.

MFC after:	3 days
2016-08-08 18:30:50 +00:00
Andrey V. Elsukov
78724b5251 Fix constructing of setdscp opcode with tablearg keyword.
setdscp's argument can have zero value that conflicts with IP_FW_TARG value.
Always set high-order bit if parser doesn't find tablearg keyword.

MFC after:	3 days
2016-08-08 18:10:30 +00:00
Andrey V. Elsukov
ed22e564b8 Add named dynamic states support to ipfw(4).
The keep-state, limit and check-state now will have additional argument
flowname. This flowname will be assigned to dynamic rule by keep-state
or limit opcode. And then can be matched by check-state opcode or
O_PROBE_STATE internal opcode. To reduce possible breakage and to maximize
compatibility with old rulesets default flowname introduced.
It will be assigned to the rules when user has omitted state name in
keep-state and check-state opcodes. Also if name is ambiguous (can be
evaluated as rule opcode) it will be replaced to default.

Reviewed by:	julian
Obtained from:	Yandex LLC
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D6674
2016-07-19 04:56:59 +00:00
Andrey V. Elsukov
b867e84e95 Add ipfw_nptv6 module that implements Network Prefix Translation for IPv6
as defined in RFC 6296. The module works together with ipfw(4) and
implemented as its external action module. When it is loaded, it registers
as eaction and can be used in rules. The usage pattern is similar to
ipfw_nat(4). All matched by rule traffic goes to the NPT module.

Reviewed by:	hrs
Obtained from:	Yandex LLC
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D6420
2016-07-18 19:46:31 +00:00
Andrey V. Elsukov
825f02a9ed Make ipfw internal olist output more user friendly.
Print object type as string for known types.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2016-05-17 11:22:08 +00:00
Andrey V. Elsukov
2685841b38 Make named objects set-aware. Now it is possible to create named
objects with the same name in different sets.

Add optional manage_sets() callback to objects rewriting framework.
It is intended to implement handler for moving and swapping named
object's sets. Add ipfw_obj_manage_sets() function that implements
generic sets handler. Use new callback to implement sets support for
lookup tables.
External actions objects are global and they don't support sets.
Modify eaction_findbyname() to reflect this.
ipfw(8) now may fail to move rules or sets, because some named objects
in target set may have conflicting names.
Note that ipfw_obj_ntlv type was changed, but since lookup tables
actually didn't support sets, this change is harmless.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2016-05-17 07:47:23 +00:00
Pedro F. Giffuni
b68ac8007d sbin: minor spelling fixes.
No functional change.
2016-04-30 19:04:59 +00:00
Andrey V. Elsukov
2acdf79f53 Add External Actions KPI to ipfw(9).
It allows implementing loadable kernel modules with new actions and
without needing to modify kernel headers and ipfw(8). The module
registers its action handler and keyword string, that will be used
as action name. Using generic syntax user can add rules with this
action. Also ipfw(8) can be easily modified to extend basic syntax
for external actions, that become a part base system.
Sample modules will coming soon.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2016-04-14 22:51:23 +00:00
Andrey V. Elsukov
7b34dbe450 Fix output formatting of O_UNREACH6 opcode.
Obtained from:	Yandex LLC
2016-04-14 18:22:08 +00:00
Andrey V. Elsukov
7aee4940a5 Set buffer to empty string to prevent duplicated output in some cases.
PR:		193888
2016-03-09 14:47:05 +00:00
Andrey V. Elsukov
23a6c7330c Fix bug in filling and handling ipfw's O_DSCP opcode.
Due to integer overflow CS4 token was handled as BE.

PR:		207459
MFC after:	1 week
2016-02-24 13:16:03 +00:00
Andrey V. Elsukov
5dc5a0e0aa Implement ipfw internal olist command to list named objects.
Reviewed by:	melifaro
Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2015-11-03 10:21:53 +00:00
Andrey V. Elsukov
56afe65ca9 Fix possible segmentation fault.
PR:		203494
MFC after:	1 week
2015-10-03 03:12:57 +00:00