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Add "show" subcommand to "ip fou"

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Sample output:

$ sudo ./ip/ip fou add port 111 ipproto 11
$ sudo ./ip/ip fou add port 222 ipproto 22 -6
$ ./ip/ip fou show
port 222 ipproto 22 -6
port 111 ipproto 11

Signed-off-by: Greg Greenway <ggreenway@apple.com>
This commit is contained in:
Greg Greenway 2017-11-16 16:53:22 -08:00 committed by Stephen Hemminger
parent 66942e522e
commit cf4caf336a
1 changed files with 60 additions and 0 deletions
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60
ip/ipfou.c
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@ -28,6 +28,7 @@ static void usage(void)
fprintf(stderr, "Usage: ip fou add port PORT "
"{ ipproto PROTO | gue } [ -6 ]\n");
fprintf(stderr, " ip fou del port PORT [ -6 ]\n");
fprintf(stderr, " ip fou show\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n");
fprintf(stderr, " PORT { 1..65535 }\n");
@ -134,6 +135,63 @@ static int do_del(int argc, char **argv)
return 0;
}
static int print_fou_mapping(const struct sockaddr_nl *who,
struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct genlmsghdr *ghdr;
struct rtattr *tb[FOU_ATTR_MAX + 1];
int len = n->nlmsg_len;
unsigned family;
if (n->nlmsg_type != genl_family)
return 0;
len -= NLMSG_LENGTH(GENL_HDRLEN);
if (len < 0)
return -1;
ghdr = NLMSG_DATA(n);
parse_rtattr(tb, FOU_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, len);
if (tb[FOU_ATTR_PORT])
fprintf(fp, "port %u", ntohs(rta_getattr_u16(tb[FOU_ATTR_PORT])));
if (tb[FOU_ATTR_TYPE] && rta_getattr_u8(tb[FOU_ATTR_TYPE]) == FOU_ENCAP_GUE)
fprintf(fp, " gue");
else if (tb[FOU_ATTR_IPPROTO])
fprintf(fp, " ipproto %u", rta_getattr_u8(tb[FOU_ATTR_IPPROTO]));
if (tb[FOU_ATTR_AF]) {
family = rta_getattr_u8(tb[FOU_ATTR_AF]);
if (family == AF_INET6)
fprintf(fp, " -6");
}
fprintf(fp, "\n");
return 0;
}
static int do_show(int argc, char **argv)
{
FOU_REQUEST(req, 4096, FOU_CMD_GET, NLM_F_REQUEST | NLM_F_DUMP);
if (argc > 0) {
fprintf(stderr, "\"ip fou show\" does not take any arguments.\n");
return -1;
}
if (rtnl_send(&genl_rth, &req.n, req.n.nlmsg_len) < 0) {
perror("Cannot send show request");
exit(1);
}
if (rtnl_dump_filter(&genl_rth, print_fou_mapping, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
return 0;
}
int do_ipfou(int argc, char **argv)
{
if (argc < 1)
@ -149,6 +207,8 @@ int do_ipfou(int argc, char **argv)
return do_add(argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return do_del(argc-1, argv+1);
if (matches(*argv, "show") == 0)
return do_show(argc-1, argv+1);
fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv);
exit(-1);
}