nftables/SOURCES/0049-parser-merge-sack-perm-sack-permitted-and-maxseg-mss.patch

From f87960ecc2ed04c803b27bb6a9c42ecd0ba0bc96 Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Mon, 12 Jul 2021 17:44:08 +0200
Subject: [PATCH] parser: merge sack-perm/sack-permitted and maxseg/mss

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1979334
Upstream Status: nftables commit 2a9aea6f2dfb6

commit 2a9aea6f2dfb6ee61528809af98860e06b38762b
Author: Florian Westphal <fw@strlen.de>
Date:   Mon Nov 2 00:27:04 2020 +0100

    parser: merge sack-perm/sack-permitted and maxseg/mss

    One was added by the tcp option parsing ocde, the other by synproxy.

    So we have:
    synproxy ... sack-perm
    synproxy ... mss

    and

    tcp option maxseg
    tcp option sack-permitted

    This kills the extra tokens on the scanner/parser side,
    so sack-perm and sack-permitted can both be used.

    Likewise, 'synproxy maxseg' and 'tcp option mss size 42' will work too.
    On the output side, the shorter form is now preferred, i.e. sack-perm
    and mss.

    Signed-off-by: Florian Westphal <fw@strlen.de>
---
 doc/payload-expression.txt    |  8 ++++----
 src/parser_bison.y            | 12 +++++-------
 src/scanner.l                 |  8 ++++----
 src/tcpopt.c                  |  2 +-
 tests/py/any/tcpopt.t         |  4 ++--
 tests/py/any/tcpopt.t.json    |  8 ++++----
 tests/py/any/tcpopt.t.payload | 12 ++++++------
 7 files changed, 26 insertions(+), 28 deletions(-)

diff --git a/doc/payload-expression.txt b/doc/payload-expression.txt
index dba42fd..3d7057c 100644
--- a/doc/payload-expression.txt
+++ b/doc/payload-expression.txt
@@ -525,13 +525,13 @@ nftables currently supports matching (finding) a given ipv6 extension header, TC
 *dst* {*nexthdr* | *hdrlength*}
 *mh* {*nexthdr* | *hdrlength* | *checksum* | *type*}
 *srh* {*flags* | *tag* | *sid* | *seg-left*}
-*tcp option* {*eol* | *noop* | *maxseg* | *window* | *sack-permitted* | *sack* | *sack0* | *sack1* | *sack2* | *sack3* | *timestamp*} 'tcp_option_field'
+*tcp option* {*eol* | *noop* | *maxseg* | *window* | *sack-perm* | *sack* | *sack0* | *sack1* | *sack2* | *sack3* | *timestamp*} 'tcp_option_field'
 *ip option* { lsrr | ra | rr | ssrr } 'ip_option_field'
 
 The following syntaxes are valid only in a relational expression with boolean type on right-hand side for checking header existence only:
 [verse]
 *exthdr* {*hbh* | *frag* | *rt* | *dst* | *mh*}
-*tcp option* {*eol* | *noop* | *maxseg* | *window* | *sack-permitted* | *sack* | *sack0* | *sack1* | *sack2* | *sack3* | *timestamp*}
+*tcp option* {*eol* | *noop* | *maxseg* | *window* | *sack-perm* | *sack* | *sack0* | *sack1* | *sack2* | *sack3* | *timestamp*}
 *ip option* { lsrr | ra | rr | ssrr }
 
 .IPv6 extension headers
@@ -568,7 +568,7 @@ kind, length, size
 |window|
 TCP Window Scaling |
 kind, length, count
-|sack-permitted|
+|sack-perm |
 TCP SACK permitted |
 kind, length
 |sack|
@@ -611,7 +611,7 @@ type, length, ptr, addr
 
 .finding TCP options
 --------------------
-filter input tcp option sack-permitted kind 1 counter
+filter input tcp option sack-perm kind 1 counter
 --------------------
 
 .matching IPv6 exthdr
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 4cca31b..56d26e3 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -221,7 +221,6 @@ int nft_lex(void *, void *, void *);
 %token SYNPROXY			"synproxy"
 %token MSS			"mss"
 %token WSCALE			"wscale"
-%token SACKPERM			"sack-perm"
 
 %token HOOK			"hook"
 %token DEVICE			"device"
@@ -385,14 +384,13 @@ int nft_lex(void *, void *, void *);
 %token OPTION			"option"
 %token ECHO			"echo"
 %token EOL			"eol"
-%token MAXSEG			"maxseg"
 %token NOOP			"noop"
 %token SACK			"sack"
 %token SACK0			"sack0"
 %token SACK1			"sack1"
 %token SACK2			"sack2"
 %token SACK3			"sack3"
-%token SACK_PERMITTED		"sack-permitted"
+%token SACK_PERM		"sack-permitted"
 %token TIMESTAMP		"timestamp"
 %token KIND			"kind"
 %token COUNT			"count"
@@ -2889,7 +2887,7 @@ synproxy_arg		:	MSS	NUM
 			{
 				$<stmt>0->synproxy.flags |= NF_SYNPROXY_OPT_TIMESTAMP;
 			}
-			|	SACKPERM
+			|	SACK_PERM
 			{
 				$<stmt>0->synproxy.flags |= NF_SYNPROXY_OPT_SACK_PERM;
 			}
@@ -2944,7 +2942,7 @@ synproxy_ts		:	/* empty */	{ $$ = 0; }
 			;
 
 synproxy_sack		:	/* empty */	{ $$ = 0; }
-			|	SACKPERM
+			|	SACK_PERM
 			{
 				$$ = NF_SYNPROXY_OPT_SACK_PERM;
 			}
@@ -4736,9 +4734,9 @@ tcp_hdr_field		:	SPORT		{ $$ = TCPHDR_SPORT; }
 
 tcp_hdr_option_type	:	EOL		{ $$ = TCPOPTHDR_EOL; }
 			|	NOOP		{ $$ = TCPOPTHDR_NOOP; }
-			|	MAXSEG		{ $$ = TCPOPTHDR_MAXSEG; }
+			|	MSS  	  	{ $$ = TCPOPTHDR_MAXSEG; }
 			|	WINDOW		{ $$ = TCPOPTHDR_WINDOW; }
-			|	SACK_PERMITTED	{ $$ = TCPOPTHDR_SACK_PERMITTED; }
+			|	SACK_PERM	{ $$ = TCPOPTHDR_SACK_PERMITTED; }
 			|	SACK		{ $$ = TCPOPTHDR_SACK0; }
 			|	SACK0		{ $$ = TCPOPTHDR_SACK0; }
 			|	SACK1		{ $$ = TCPOPTHDR_SACK1; }
diff --git a/src/scanner.l b/src/scanner.l
index 7daf5c1..a369802 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -419,14 +419,16 @@ addrstring	({macaddr}|{ip4addr}|{ip6addr})
 
 "echo"			{ return ECHO; }
 "eol"			{ return EOL; }
-"maxseg"		{ return MAXSEG; }
+"maxseg"		{ return MSS; }
+"mss"			{ return MSS; }
 "noop"			{ return NOOP; }
 "sack"			{ return SACK; }
 "sack0"			{ return SACK0; }
 "sack1"			{ return SACK1; }
 "sack2"			{ return SACK2; }
 "sack3"			{ return SACK3; }
-"sack-permitted"	{ return SACK_PERMITTED; }
+"sack-permitted"	{ return SACK_PERM; }
+"sack-perm"		{ return SACK_PERM; }
 "timestamp"		{ return TIMESTAMP; }
 "time"			{ return TIME; }
 
@@ -562,9 +564,7 @@ addrstring	({macaddr}|{ip4addr}|{ip6addr})
 "osf"			{ return OSF; }
 
 "synproxy"		{ return SYNPROXY; }
-"mss"			{ return MSS; }
 "wscale"		{ return WSCALE; }
-"sack-perm"		{ return SACKPERM; }
 
 "notrack"		{ return NOTRACK; }
 
diff --git a/src/tcpopt.c b/src/tcpopt.c
index ec305d9..6dbaa9e 100644
--- a/src/tcpopt.c
+++ b/src/tcpopt.c
@@ -55,7 +55,7 @@ static const struct exthdr_desc tcpopt_window = {
 };
 
 static const struct exthdr_desc tcpopt_sack_permitted = {
-	.name		= "sack-permitted",
+	.name		= "sack-perm",
 	.type		= TCPOPT_SACK_PERMITTED,
 	.templates	= {
 		[TCPOPTHDR_FIELD_KIND]		= PHT("kind",   0, 8),
diff --git a/tests/py/any/tcpopt.t b/tests/py/any/tcpopt.t
index 08b1dcb..5f21d49 100644
--- a/tests/py/any/tcpopt.t
+++ b/tests/py/any/tcpopt.t
@@ -12,8 +12,8 @@ tcp option maxseg size 1;ok
 tcp option window kind 1;ok
 tcp option window length 1;ok
 tcp option window count 1;ok
-tcp option sack-permitted kind 1;ok
-tcp option sack-permitted length 1;ok
+tcp option sack-perm kind 1;ok
+tcp option sack-perm length 1;ok
 tcp option sack kind 1;ok
 tcp option sack length 1;ok
 tcp option sack left 1;ok
diff --git a/tests/py/any/tcpopt.t.json b/tests/py/any/tcpopt.t.json
index 48eb339..2c6236a 100644
--- a/tests/py/any/tcpopt.t.json
+++ b/tests/py/any/tcpopt.t.json
@@ -126,14 +126,14 @@
     }
 ]
 
-# tcp option sack-permitted kind 1
+# tcp option sack-perm kind 1
 [
     {
         "match": {
             "left": {
                 "tcp option": {
                     "field": "kind",
-                    "name": "sack-permitted"
+                    "name": "sack-perm"
                 }
             },
             "op": "==",
@@ -142,14 +142,14 @@
     }
 ]
 
-# tcp option sack-permitted length 1
+# tcp option sack-perm length 1
 [
     {
         "match": {
             "left": {
                 "tcp option": {
                     "field": "length",
-                    "name": "sack-permitted"
+                    "name": "sack-perm"
                 }
             },
             "op": "==",
diff --git a/tests/py/any/tcpopt.t.payload b/tests/py/any/tcpopt.t.payload
index 63751cf..f63076a 100644
--- a/tests/py/any/tcpopt.t.payload
+++ b/tests/py/any/tcpopt.t.payload
@@ -166,42 +166,42 @@ inet
   [ exthdr load tcpopt 1b @ 3 + 2 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted kind 1
+# tcp option sack-perm kind 1
 ip 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
   [ exthdr load tcpopt 1b @ 4 + 0 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted kind 1
+# tcp option sack-perm kind 1
 ip6 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
   [ exthdr load tcpopt 1b @ 4 + 0 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted kind 1
+# tcp option sack-perm kind 1
 inet 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
   [ exthdr load tcpopt 1b @ 4 + 0 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted length 1
+# tcp option sack-perm length 1
 ip 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
   [ exthdr load tcpopt 1b @ 4 + 1 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted length 1
+# tcp option sack-perm length 1
 ip6 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
   [ exthdr load tcpopt 1b @ 4 + 1 => reg 1 ]
   [ cmp eq reg 1 0x00000001 ]
 
-# tcp option sack-permitted length 1
+# tcp option sack-perm length 1
 inet 
   [ meta load l4proto => reg 1 ]
   [ cmp eq reg 1 0x00000006 ]
-- 
2.31.1