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-rw-r--r--ip/link_iptnl.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/ip/link_iptnl.c b/ip/link_iptnl.c
new file mode 100644
index 0000000..b25855b
--- /dev/null
+++ b/ip/link_iptnl.c
@@ -0,0 +1,496 @@
+/*
+ * link_iptnl.c ipip and sit driver module
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Nicolas Dichtel <nicolas.dichtel@6wind.com>
+ *
+ */
+
+#include <string.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+#include "tunnel.h"
+
+static void iptunnel_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ const char *mode;
+
+ if (strcmp(lu->id, "sit") == 0) {
+ mode = "{ ip6ip | ipip | mplsip | any } ]\n"
+ " [ isatap";
+ } else {
+ mode = "{ ipip | mplsip | any }";
+ }
+
+ fprintf(f,
+ "Usage: ... %-6s [ remote ADDR ]\n"
+ " [ local ADDR ]\n"
+ " [ ttl TTL ]\n"
+ " [ tos TOS ]\n"
+ " [ [no]pmtudisc ]\n"
+ " [ 6rd-prefix ADDR ]\n"
+ " [ 6rd-relay_prefix ADDR ]\n"
+ " [ 6rd-reset ]\n"
+ " [ dev PHYS_DEV ]\n"
+ " [ fwmark MARK ]\n"
+ " [ external ]\n"
+ " [ noencap ]\n"
+ " [ encap { fou | gue | none } ]\n"
+ " [ encap-sport PORT ]\n"
+ " [ encap-dport PORT ]\n"
+ " [ [no]encap-csum ]\n"
+ " [ [no]encap-csum6 ]\n"
+ " [ [no]encap-remcsum ]\n"
+ " [ mode %s ]\n"
+ "\n"
+ "Where: ADDR := { IP_ADDRESS | any }\n"
+ " TOS := { NUMBER | inherit }\n"
+ " TTL := { 1..255 | inherit }\n"
+ " MARK := { 0x0..0xffffffff }\n",
+ lu->id, mode);
+}
+
+static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+ struct ifinfomsg *ifi = NLMSG_DATA(n);
+ struct {
+ struct nlmsghdr n;
+ struct ifinfomsg i;
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
+ .n.nlmsg_flags = NLM_F_REQUEST,
+ .n.nlmsg_type = RTM_GETLINK,
+ .i.ifi_family = preferred_family,
+ .i.ifi_index = ifi->ifi_index,
+ };
+ struct nlmsghdr *answer;
+ struct rtattr *tb[IFLA_MAX + 1];
+ struct rtattr *linkinfo[IFLA_INFO_MAX+1];
+ struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
+ int len;
+ inet_prefix saddr, daddr, ip6rdprefix, ip6rdrelayprefix;
+ __u8 pmtudisc = 1;
+ __u8 tos = 0;
+ __u16 iflags = 0;
+ __u8 ttl = 0;
+ __u8 proto = 0;
+ __u32 link = 0;
+ __u16 encaptype = 0;
+ __u16 encapflags = 0;
+ __u16 encapsport = 0;
+ __u16 encapdport = 0;
+ __u8 metadata = 0;
+ __u32 fwmark = 0;
+
+ inet_prefix_reset(&saddr);
+ inet_prefix_reset(&daddr);
+
+ inet_prefix_reset(&ip6rdprefix);
+ inet_prefix_reset(&ip6rdrelayprefix);
+
+ if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+ const struct rtattr *rta;
+
+ if (rtnl_talk(&rth, &req.n, &answer) < 0) {
+get_failed:
+ fprintf(stderr,
+ "Failed to get existing tunnel info.\n");
+ return -1;
+ }
+
+ len = answer->nlmsg_len;
+ len -= NLMSG_LENGTH(sizeof(*ifi));
+ if (len < 0)
+ goto get_failed;
+
+ parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
+
+ if (!tb[IFLA_LINKINFO])
+ goto get_failed;
+
+ parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
+
+ if (!linkinfo[IFLA_INFO_DATA])
+ goto get_failed;
+
+ parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
+ linkinfo[IFLA_INFO_DATA]);
+
+ rta = iptuninfo[IFLA_IPTUN_LOCAL];
+ if (rta && get_addr_rta(&saddr, rta, AF_INET))
+ goto get_failed;
+
+ rta = iptuninfo[IFLA_IPTUN_REMOTE];
+ if (rta && get_addr_rta(&daddr, rta, AF_INET))
+ goto get_failed;
+
+ rta = iptuninfo[IFLA_IPTUN_6RD_PREFIX];
+ if (rta && get_addr_rta(&ip6rdprefix, rta, AF_INET6))
+ goto get_failed;
+
+ rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX];
+ if (rta && get_addr_rta(&ip6rdrelayprefix, rta, AF_INET))
+ goto get_failed;
+
+ rta = iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN];
+ ip6rdprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
+
+ rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN];
+ ip6rdrelayprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
+
+ if (iptuninfo[IFLA_IPTUN_TTL])
+ ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
+
+ if (iptuninfo[IFLA_IPTUN_PMTUDISC])
+ pmtudisc =
+ rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
+
+ if (iptuninfo[IFLA_IPTUN_TOS])
+ tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
+
+ if (iptuninfo[IFLA_IPTUN_FLAGS])
+ iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
+
+ if (iptuninfo[IFLA_IPTUN_LINK])
+ link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
+
+ if (iptuninfo[IFLA_IPTUN_PROTO])
+ proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
+
+ if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
+ encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
+ if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
+ encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
+ if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
+ encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
+ if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
+ encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
+
+ if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
+ metadata = 1;
+
+ if (iptuninfo[IFLA_IPTUN_FWMARK])
+ fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
+
+ free(answer);
+ }
+
+ while (argc > 0) {
+ if (strcmp(*argv, "mode") == 0) {
+ NEXT_ARG();
+ if (strcmp(lu->id, "sit") == 0 &&
+ (strcmp(*argv, "ipv6/ipv4") == 0 ||
+ strcmp(*argv, "ip6ip") == 0))
+ proto = IPPROTO_IPV6;
+ else if (strcmp(*argv, "ipv4/ipv4") == 0 ||
+ strcmp(*argv, "ipip") == 0 ||
+ strcmp(*argv, "ip4ip4") == 0)
+ proto = IPPROTO_IPIP;
+ else if (strcmp(*argv, "mpls/ipv4") == 0 ||
+ strcmp(*argv, "mplsip") == 0)
+ proto = IPPROTO_MPLS;
+ else if (strcmp(*argv, "any/ipv4") == 0 ||
+ strcmp(*argv, "any") == 0)
+ proto = 0;
+ else
+ invarg("Cannot guess tunnel mode.", *argv);
+ } else if (strcmp(*argv, "remote") == 0) {
+ NEXT_ARG();
+ get_addr(&daddr, *argv, AF_INET);
+ } else if (strcmp(*argv, "local") == 0) {
+ NEXT_ARG();
+ get_addr(&saddr, *argv, AF_INET);
+ } else if (matches(*argv, "dev") == 0) {
+ NEXT_ARG();
+ link = ll_name_to_index(*argv);
+ if (!link)
+ exit(nodev(*argv));
+ } else if (strcmp(*argv, "ttl") == 0 ||
+ strcmp(*argv, "hoplimit") == 0 ||
+ strcmp(*argv, "hlim") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0) {
+ if (get_u8(&ttl, *argv, 0))
+ invarg("invalid TTL\n", *argv);
+ } else
+ ttl = 0;
+ } else if (strcmp(*argv, "tos") == 0 ||
+ strcmp(*argv, "tclass") == 0 ||
+ strcmp(*argv, "tc") == 0 ||
+ matches(*argv, "dsfield") == 0) {
+ __u32 uval;
+
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0) {
+ if (rtnl_dsfield_a2n(&uval, *argv))
+ invarg("bad TOS value", *argv);
+ tos = uval;
+ } else
+ tos = 1;
+ } else if (strcmp(*argv, "nopmtudisc") == 0) {
+ pmtudisc = 0;
+ } else if (strcmp(*argv, "pmtudisc") == 0) {
+ pmtudisc = 1;
+ } else if (strcmp(lu->id, "sit") == 0 &&
+ strcmp(*argv, "isatap") == 0) {
+ iflags |= SIT_ISATAP;
+ } else if (strcmp(*argv, "noencap") == 0) {
+ encaptype = TUNNEL_ENCAP_NONE;
+ } else if (strcmp(*argv, "encap") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "fou") == 0)
+ encaptype = TUNNEL_ENCAP_FOU;
+ else if (strcmp(*argv, "gue") == 0)
+ encaptype = TUNNEL_ENCAP_GUE;
+ else if (strcmp(*argv, "none") == 0)
+ encaptype = TUNNEL_ENCAP_NONE;
+ else
+ invarg("Invalid encap type.", *argv);
+ } else if (strcmp(*argv, "encap-sport") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "auto") == 0)
+ encapsport = 0;
+ else if (get_u16(&encapsport, *argv, 0))
+ invarg("Invalid source port.", *argv);
+ } else if (strcmp(*argv, "encap-dport") == 0) {
+ NEXT_ARG();
+ if (get_u16(&encapdport, *argv, 0))
+ invarg("Invalid destination port.", *argv);
+ } else if (strcmp(*argv, "encap-csum") == 0) {
+ encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
+ } else if (strcmp(*argv, "noencap-csum") == 0) {
+ encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
+ } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
+ encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
+ } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
+ encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
+ } else if (strcmp(*argv, "encap-remcsum") == 0) {
+ encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
+ } else if (strcmp(*argv, "noencap-remcsum") == 0) {
+ encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
+ } else if (strcmp(*argv, "external") == 0) {
+ metadata = 1;
+ } else if (strcmp(*argv, "6rd-prefix") == 0) {
+ NEXT_ARG();
+ if (get_prefix(&ip6rdprefix, *argv, AF_INET6))
+ invarg("invalid 6rd_prefix\n", *argv);
+ } else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
+ NEXT_ARG();
+ if (get_prefix(&ip6rdrelayprefix, *argv, AF_INET))
+ invarg("invalid 6rd-relay_prefix\n", *argv);
+ } else if (strcmp(*argv, "6rd-reset") == 0) {
+ get_prefix(&ip6rdprefix, "2002::/16", AF_INET6);
+ inet_prefix_reset(&ip6rdrelayprefix);
+ } else if (strcmp(*argv, "fwmark") == 0) {
+ NEXT_ARG();
+ if (get_u32(&fwmark, *argv, 0))
+ invarg("invalid fwmark\n", *argv);
+ } else {
+ iptunnel_print_help(lu, argc, argv, stderr);
+ return -1;
+ }
+ argc--, argv++;
+ }
+
+ if (ttl && pmtudisc == 0) {
+ fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
+ exit(-1);
+ }
+
+ addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
+ if (metadata) {
+ addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
+ return 0;
+ }
+
+ if (is_addrtype_inet_not_unspec(&saddr)) {
+ addattr_l(n, 1024, IFLA_IPTUN_LOCAL,
+ saddr.data, saddr.bytelen);
+ }
+ if (is_addrtype_inet_not_unspec(&daddr)) {
+ addattr_l(n, 1024, IFLA_IPTUN_REMOTE,
+ daddr.data, daddr.bytelen);
+ }
+ addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
+ addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
+ addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
+ addattr32(n, 1024, IFLA_IPTUN_LINK, link);
+ addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
+
+ addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
+ addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
+ addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
+ addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
+
+ if (strcmp(lu->id, "sit") == 0) {
+ addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
+ if (is_addrtype_inet(&ip6rdprefix)) {
+ addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
+ ip6rdprefix.data, ip6rdprefix.bytelen);
+ addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
+ ip6rdprefix.bitlen);
+ }
+ if (is_addrtype_inet(&ip6rdrelayprefix)) {
+ addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
+ ip6rdrelayprefix.data[0]);
+ addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
+ ip6rdrelayprefix.bitlen);
+ }
+ }
+
+ return 0;
+}
+
+static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+ char s2[64];
+ __u16 prefixlen;
+ __u8 ttl = 0;
+ __u8 tos = 0;
+
+ if (!tb)
+ return;
+
+ if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
+ print_bool(PRINT_ANY, "external", "external ", true);
+ }
+
+ if (tb[IFLA_IPTUN_PROTO]) {
+ switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
+ case IPPROTO_IPIP:
+ print_string(PRINT_ANY, "proto", "%s ", "ipip");
+ break;
+ case IPPROTO_IPV6:
+ print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
+ break;
+ case IPPROTO_MPLS:
+ print_string(PRINT_ANY, "proto", "%s ", "mplsip");
+ break;
+ case 0:
+ print_string(PRINT_ANY, "proto", "%s ", "any");
+ break;
+ }
+ }
+
+ tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET);
+ tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET);
+
+ if (tb[IFLA_IPTUN_LINK]) {
+ __u32 link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
+
+ if (link) {
+ print_string(PRINT_ANY, "link", "dev %s ",
+ ll_index_to_name(link));
+ }
+ }
+
+ if (tb[IFLA_IPTUN_TTL])
+ ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
+ if (is_json_context() || ttl)
+ print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
+ else
+ print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
+
+ if (tb[IFLA_IPTUN_TOS])
+ tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
+ if (tos) {
+ if (is_json_context() || tos != 1)
+ print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos);
+ else
+ print_string(PRINT_FP, NULL, "tos %s ", "inherit");
+ }
+
+ if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
+ print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
+ else
+ print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
+
+ if (tb[IFLA_IPTUN_FLAGS]) {
+ __u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
+
+ if (iflags & SIT_ISATAP)
+ print_bool(PRINT_ANY, "isatap", "isatap ", true);
+ }
+
+ if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
+ (prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
+ __u16 relayprefixlen =
+ rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
+ __u32 relayprefix =
+ rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
+
+ const char *prefix = inet_ntop(AF_INET6,
+ RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
+ s2, sizeof(s2));
+
+ if (is_json_context()) {
+ print_string(PRINT_JSON, "prefix", NULL, prefix);
+ print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
+ if (relayprefix) {
+ print_string(PRINT_JSON,
+ "relay_prefix",
+ NULL,
+ format_host(AF_INET,
+ 4,
+ &relayprefix));
+ print_int(PRINT_JSON,
+ "relay_prefixlen",
+ NULL,
+ relayprefixlen);
+ }
+ } else {
+ printf("6rd-prefix %s/%u ", prefix, prefixlen);
+ if (relayprefix) {
+ printf("6rd-relay_prefix %s/%u ",
+ format_host(AF_INET, 4, &relayprefix),
+ relayprefixlen);
+ }
+ }
+ }
+
+ if (tb[IFLA_IPTUN_FWMARK]) {
+ __u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
+
+ if (fwmark) {
+ print_0xhex(PRINT_ANY,
+ "fwmark", "fwmark %#llx ", fwmark);
+ }
+ }
+
+ tnl_print_encap(tb,
+ IFLA_IPTUN_ENCAP_TYPE,
+ IFLA_IPTUN_ENCAP_FLAGS,
+ IFLA_IPTUN_ENCAP_SPORT,
+ IFLA_IPTUN_ENCAP_DPORT);
+}
+
+struct link_util ipip_link_util = {
+ .id = "ipip",
+ .maxattr = IFLA_IPTUN_MAX,
+ .parse_opt = iptunnel_parse_opt,
+ .print_opt = iptunnel_print_opt,
+ .print_help = iptunnel_print_help,
+};
+
+struct link_util sit_link_util = {
+ .id = "sit",
+ .maxattr = IFLA_IPTUN_MAX,
+ .parse_opt = iptunnel_parse_opt,
+ .print_opt = iptunnel_print_opt,
+ .print_help = iptunnel_print_help,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-30 17:46:32 +0000