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From da77e40e234599218a3d61434abb5af2815d72a7 Mon Sep 17 00:00:00 2001
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From: Andrea Claudi <aclaudi@redhat.com>
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Date: Sun, 2 Jun 2019 16:06:23 +0200
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Subject: [PATCH] ss: Review ssfilter
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1698401
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Upstream Status: iproute2.git commit 38d209ecf2ae9
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commit 38d209ecf2ae966b9b25de4acb60cdffb0e06ced
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Author: Phil Sutter <phil@nwl.cc>
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Date: Tue Aug 14 14:18:06 2018 +0200
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ss: Review ssfilter
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The original problem was ssfilter rejecting single expressions if
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enclosed in braces, such as:
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| sport = 22 or ( dport = 22 )
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This is fixed by allowing 'expr' to be an 'exprlist' enclosed in braces.
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The no longer required recursion in 'exprlist' being an 'exprlist'
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enclosed in braces is dropped.
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In addition to that, a few other things are changed:
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* Remove pointless 'null' prefix in 'appled' before 'exprlist'.
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* For simple equals matches, '=' operator was required for ports but not
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allowed for hosts. Make this consistent by making '=' operator
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optional in both cases.
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Reported-by: Samuel Mannehed <samuel@cendio.se>
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Fixes: b2038cc0b2403 ("ssfilter: Eliminate shift/reduce conflicts")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
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---
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misc/ssfilter.y | 36 +++++++++++++++++++++---------------
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1 file changed, 21 insertions(+), 15 deletions(-)
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diff --git a/misc/ssfilter.y b/misc/ssfilter.y
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index 88d4229a9b241..0413dddaa7584 100644
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--- a/misc/ssfilter.y
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+++ b/misc/ssfilter.y
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@@ -42,24 +42,22 @@ static void yyerror(char *s)
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%nonassoc '!'
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%%
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-applet: null exprlist
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+applet: exprlist
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{
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- *yy_ret = $2;
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- $$ = $2;
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+ *yy_ret = $1;
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+ $$ = $1;
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}
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| null
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;
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+
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null: /* NOTHING */ { $$ = NULL; }
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;
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+
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exprlist: expr
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| '!' expr
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{
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$$ = alloc_node(SSF_NOT, $2);
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}
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- | '(' exprlist ')'
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- {
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- $$ = $2;
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- }
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| exprlist '|' expr
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{
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$$ = alloc_node(SSF_OR, $1);
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@@ -77,13 +75,21 @@ exprlist: expr
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}
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;
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-expr: DCOND HOSTCOND
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+eq: '='
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+ | /* nothing */
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+ ;
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+
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+expr: '(' exprlist ')'
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+ {
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+ $$ = $2;
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+ }
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+ | DCOND eq HOSTCOND
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{
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- $$ = alloc_node(SSF_DCOND, $2);
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+ $$ = alloc_node(SSF_DCOND, $3);
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}
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- | SCOND HOSTCOND
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+ | SCOND eq HOSTCOND
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{
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- $$ = alloc_node(SSF_SCOND, $2);
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+ $$ = alloc_node(SSF_SCOND, $3);
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}
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| DPORT GEQ HOSTCOND
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{
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@@ -101,7 +107,7 @@ expr: DCOND HOSTCOND
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{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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$$ = alloc_node(SSF_NOT, alloc_node(SSF_D_GE, $3));
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}
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- | DPORT '=' HOSTCOND
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ | DPORT eq HOSTCOND
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{
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$$ = alloc_node(SSF_DCOND, $3);
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}
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8def76 |
@@ -126,7 +132,7 @@ expr: DCOND HOSTCOND
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{
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$$ = alloc_node(SSF_NOT, alloc_node(SSF_S_GE, $3));
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}
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- | SPORT '=' HOSTCOND
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+ | SPORT eq HOSTCOND
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{
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$$ = alloc_node(SSF_SCOND, $3);
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}
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8def76 |
@@ -134,7 +140,7 @@ expr: DCOND HOSTCOND
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{
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$$ = alloc_node(SSF_NOT, alloc_node(SSF_SCOND, $3));
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}
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- | DEVNAME '=' DEVCOND
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+ | DEVNAME eq DEVCOND
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{
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$$ = alloc_node(SSF_DEVCOND, $3);
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}
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8def76 |
@@ -142,7 +148,7 @@ expr: DCOND HOSTCOND
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{
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$$ = alloc_node(SSF_NOT, alloc_node(SSF_DEVCOND, $3));
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}
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- | FWMARK '=' MARKMASK
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+ | FWMARK eq MARKMASK
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{
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$$ = alloc_node(SSF_MARKMASK, $3);
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}
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--
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8def76 |
2.20.1
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