short-hand version of tcp option maxseg size 1:
tcp option mss set 1
Reverse also prints the more compact representation.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
src/exthdr.c | 1 +
src/parser_bison.y | 7 +++++++
src/scanner.l | 1 +
src/tcpopt.c | 11 +++++++++--
4 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/src/exthdr.c b/src/exthdr.c
index 7d13c83c9943..a4d4fa5b0864 100644
--- a/src/exthdr.c
+++ b/src/exthdr.c
@@ -20,6 +20,7 @@
#include <utils.h>
#include <headers.h>
+#include <tcpopt.h>
#include <expression.h>
#include <statement.h>
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 7898ea3fe7bc..533347264729 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -334,6 +334,7 @@ static void location_update(struct location *loc, struct location *rhs, int n)
%token RIGHT "right"
%token TSVAL "tsval"
%token TSECR "tsecr"
+%token MSS "mss"
%token DCCP "dccp"
@@ -3214,6 +3215,12 @@ payload_stmt : payload_expr SET expr
else
$$ = payload_stmt_alloc(&@$, $1, $3);
}
+ | TCP OPTION MSS SET expr
+ {
+ $$ = exthdr_stmt_alloc(&@$,
+ tcpopt_expr_alloc(&@$, TCPOPTHDR_MAXSEG, TCPOPTHDR_FIELD_SIZE),
+ $5);
+ }
;
payload_expr : payload_raw_expr
diff --git a/src/scanner.l b/src/scanner.l
index b6ba32d88f4a..ede6ed73e5df 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -433,6 +433,7 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr})
"window" { return WINDOW; }
"urgptr" { return URGPTR; }
"option" { return OPTION; }
+"mss" { return MSS; }
"dccp" { return DCCP; }
diff --git a/src/tcpopt.c b/src/tcpopt.c
index 63f0c236c9cf..c0540b7a31b2 100644
--- a/src/tcpopt.c
+++ b/src/tcpopt.c
@@ -249,8 +249,15 @@ void tcpopt_expr_print(const struct expr *expr, struct output_ctx *octx)
void tcpopt_stmt_print(const struct stmt *stmt, struct output_ctx *octx)
{
- tcpopt_expr_print(stmt->exthdr.expr, octx);
- printf(" set ");
+ if (stmt->exthdr.expr->exthdr.desc->type == TCPOPT_MAXSEG &&
+ stmt->exthdr.expr->exthdr.tmpl ==
+ &stmt->exthdr.expr->exthdr.desc->templates[TCPOPTHDR_FIELD_SIZE]) {
+ printf("tcp option mss set ");
+ } else {
+ tcpopt_expr_print(stmt->exthdr.expr, octx);
+ printf(" set ");
+ }
+
expr_print(stmt->exthdr.val, octx);
}
--
2.13.0
--
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