iptunnel: share common code when setting tunnel mode
Signed-off-by: Phil Sutter <phil@nwl.cc>
diff --git a/ip/iptunnel.c b/ip/iptunnel.c
index e323c1f..92edb34 100644
--- a/ip/iptunnel.c
+++ b/ip/iptunnel.c
@@ -47,6 +47,15 @@
exit(-1);
}
+static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto)
+{
+ if (p->iph.protocol && p->iph.protocol != proto) {
+ fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
+ exit(-1);
+ }
+ p->iph.protocol = proto;
+}
+
static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
{
int count = 0;
@@ -68,38 +77,18 @@
NEXT_ARG();
if (strcmp(*argv, "ipip") == 0 ||
strcmp(*argv, "ip/ip") == 0) {
- if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
- }
- p->iph.protocol = IPPROTO_IPIP;
+ set_tunnel_proto(p, IPPROTO_IPIP);
} else if (strcmp(*argv, "gre") == 0 ||
strcmp(*argv, "gre/ip") == 0) {
- if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
- }
- p->iph.protocol = IPPROTO_GRE;
+ set_tunnel_proto(p, IPPROTO_GRE);
} else if (strcmp(*argv, "sit") == 0 ||
strcmp(*argv, "ipv6/ip") == 0) {
- if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
- }
- p->iph.protocol = IPPROTO_IPV6;
+ set_tunnel_proto(p, IPPROTO_IPV6);
} else if (strcmp(*argv, "isatap") == 0) {
- if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
- fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
- exit(-1);
- }
- p->iph.protocol = IPPROTO_IPV6;
+ set_tunnel_proto(p, IPPROTO_IPV6);
isatap++;
} else if (strcmp(*argv, "vti") == 0) {
- if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
- fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
- exit(-1);
- }
- p->iph.protocol = IPPROTO_IPIP;
+ set_tunnel_proto(p, IPPROTO_IPIP);
p->i_flags |= VTI_ISVTI;
} else {
fprintf(stderr,"Unknown tunnel mode \"%s\"\n", *argv);