[PATCH iproute2] Add "show" subcommand to "ip fou"
From: Greg Greenway <hidden>
Date: 2017-10-31 20:15:50
Sample output: $ ip fou show port 4 af AF_INET ipproto 4 Signed-off-by: Greg Greenway <redacted> --- ip/ipfou.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+)
diff --git a/ip/ipfou.c b/ip/ipfou.c
index 00dbe15..2eb5bfd 100644
--- a/ip/ipfou.c
+++ b/ip/ipfou.c@@ -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 +135,69 @@ 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; + char *family_str; + + 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_AF]) { + family = rta_getattr_u8(tb[FOU_ATTR_AF]); + if (family == AF_INET) + family_str = "AF_INET"; + else if (family == AF_INET6) + family_str = "AF_INET6"; + else + family_str = "unknown"; + fprintf(fp, "af %s ", family_str); + } + 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])); + 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 +213,8 @@ 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); }
--
2.7.4