libxtables: guided option parser

This patchset seeks to drastically reduce the code in the individual
extensions by centralizing their argument parsing (breakdown of
strings), validation, and in part, assignment.

As a secondary goal, this reduces the number of static storage duration
variables in flight.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 20 insertions, 0 deletions

diff --git a/xshared.h b/xshared.h
index 94abb392..be53535b 100644
--- a/xshared.h
+++ b/xshared.h
@@ -26,6 +26,24 @@ enum {
 struct xtables_rule_match;
 struct xtables_target;
 
+/**
+ * xtables_afinfo - protocol family dependent information
+ * @kmod:		kernel module basename (e.g. "ip_tables")
+ * @libprefix:		prefix of .so library name (e.g. "libipt_")
+ * @family:		nfproto family
+ * @ipproto:		used by setsockopt (e.g. IPPROTO_IP)
+ * @so_rev_match:	optname to check revision support of match
+ * @so_rev_target:	optname to check revision support of target
+ */
+struct xtables_afinfo {
+	const char *kmod;
+	const char *libprefix;
+	uint8_t family;
+	uint8_t ipproto;
+	int so_rev_match;
+	int so_rev_target;
+};
+
 struct iptables_command_state {
 	union {
 		struct ipt_entry fw;
@@ -59,4 +77,6 @@ extern const char *proto_to_name(uint8_t, int);
 extern struct xtables_match *load_proto(struct iptables_command_state *);
 extern int subcmd_main(int, char **, const struct subcommand *);
 
+extern const struct xtables_afinfo *afinfo;
+
 #endif /* IPTABLES_XSHARED_H */