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-rw-r--r--ip/ipprefix.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/ip/ipprefix.c b/ip/ipprefix.c
new file mode 100644
index 0000000..c5704e5
--- /dev/null
+++ b/ip/ipprefix.c
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C)2005 USAGI/WIDE Project
+ *
+ *
+ * based on ip.c, iproute.c
+ *
+ * Authors:
+ * Masahide NAKAMURA @USAGI
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/icmp6.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+/* prefix flags; see kernel's net/ipv6/addrconf.c and include/net/if_inet6.h */
+#define IF_PREFIX_ONLINK 0x01
+#define IF_PREFIX_AUTOCONF 0x02
+
+int print_prefix(struct nlmsghdr *n, void *arg)
+{
+ FILE *fp = (FILE *)arg;
+ struct prefixmsg *prefix = NLMSG_DATA(n);
+ int len = n->nlmsg_len;
+ struct rtattr *tb[RTA_MAX+1];
+ int family = preferred_family;
+
+ if (n->nlmsg_type != RTM_NEWPREFIX) {
+ fprintf(stderr, "Not a prefix: %08x %08x %08x\n",
+ n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+ return 0;
+ }
+
+ len -= NLMSG_LENGTH(sizeof(*prefix));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+ return -1;
+ }
+
+ if (family == AF_UNSPEC)
+ family = AF_INET6;
+ if (family != AF_INET6)
+ return 0;
+
+ if (prefix->prefix_family != AF_INET6) {
+ fprintf(stderr, "incorrect protocol family: %d\n", prefix->prefix_family);
+ return 0;
+ }
+ if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) {
+ fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type);
+ return 0;
+ }
+
+ parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len);
+
+ if (tb[PREFIX_ADDRESS]) {
+ fprintf(fp, "prefix %s/%u",
+ rt_addr_n2a_rta(family, tb[PREFIX_ADDRESS]),
+ prefix->prefix_len);
+ }
+ fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex));
+
+ if (prefix->prefix_flags & IF_PREFIX_ONLINK)
+ fprintf(fp, "onlink ");
+ if (prefix->prefix_flags & IF_PREFIX_AUTOCONF)
+ fprintf(fp, "autoconf ");
+
+ if (tb[PREFIX_CACHEINFO]) {
+ const struct prefix_cacheinfo *pc
+ = RTA_DATA(tb[PREFIX_CACHEINFO]);
+
+ fprintf(fp, "valid %u ", pc->valid_time);
+ fprintf(fp, "preferred %u ", pc->preferred_time);
+ }
+
+ fprintf(fp, "\n");
+ fflush(fp);
+
+ return 0;
+}