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-rw-r--r--ip/link_ip6tnl.c465
1 files changed, 465 insertions, 0 deletions
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
new file mode 100644
index 0000000..2fcc13e
--- /dev/null
+++ b/ip/link_ip6tnl.c
@@ -0,0 +1,465 @@
+/*
+ * link_ip6tnl.c ip6tnl 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/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/ip6_tunnel.h>
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+#include "tunnel.h"
+
+#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
+#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
+
+#define DEFAULT_TNL_HOP_LIMIT (64)
+
+static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ fprintf(f,
+ "Usage: ... %-6s [ remote ADDR ]\n"
+ " [ local ADDR ]\n"
+ " [ encaplimit ELIM ]\n"
+ " [ hoplimit HLIM ]\n"
+ " [ tclass TCLASS ]\n"
+ " [ flowlabel FLOWLABEL ]\n"
+ " [ dscp inherit ]\n"
+ " [ [no]allow-localremote ]\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 { ip6ip6 | ipip6 | any } ]\n"
+ "\n"
+ "Where: ADDR := IPV6_ADDRESS\n"
+ " ELIM := { none | 0..255 }(default=%d)\n"
+ " HLIM := 0..255 (default=%d)\n"
+ " TCLASS := { 0x0..0xff | inherit }\n"
+ " FLOWLABEL := { 0x0..0xfffff | inherit }\n"
+ " MARK := { 0x0..0xffffffff | inherit }\n",
+ lu->id,
+ IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT);
+}
+
+static int ip6tunnel_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;
+ __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
+ __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
+ __u32 flowinfo = 0;
+ __u32 flags = 0;
+ __u8 proto = 0;
+ __u32 link = 0;
+ __u16 encaptype = 0;
+ __u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
+ __u16 encapsport = 0;
+ __u16 encapdport = 0;
+ __u8 metadata = 0;
+ __u32 fwmark = 0;
+
+ inet_prefix_reset(&saddr);
+ inet_prefix_reset(&daddr);
+
+ 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_INET6))
+ goto get_failed;
+
+ rta = iptuninfo[IFLA_IPTUN_REMOTE];
+ if (rta && get_addr_rta(&daddr, rta, AF_INET6))
+ goto get_failed;
+
+ if (iptuninfo[IFLA_IPTUN_TTL])
+ hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
+
+ if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
+ encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);
+
+ if (iptuninfo[IFLA_IPTUN_FLOWINFO])
+ flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);
+
+ if (iptuninfo[IFLA_IPTUN_FLAGS])
+ flags = rta_getattr_u32(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_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(*argv, "ipv6/ipv6") == 0 ||
+ strcmp(*argv, "ip6ip6") == 0)
+ proto = IPPROTO_IPV6;
+ else if (strcmp(*argv, "ip/ipv6") == 0 ||
+ strcmp(*argv, "ipv4/ipv6") == 0 ||
+ strcmp(*argv, "ipip6") == 0 ||
+ strcmp(*argv, "ip4ip6") == 0)
+ proto = IPPROTO_IPIP;
+ else if (strcmp(*argv, "any/ipv6") == 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_INET6);
+ } else if (strcmp(*argv, "local") == 0) {
+ NEXT_ARG();
+ get_addr(&saddr, *argv, AF_INET6);
+ } 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(&hop_limit, *argv, 0))
+ invarg("invalid HLIM\n", *argv);
+ } else
+ hop_limit = 0;
+ } else if (strcmp(*argv, "encaplimit") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "none") == 0) {
+ flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
+ } else {
+ __u8 uval;
+
+ if (get_u8(&uval, *argv, 0) < -1)
+ invarg("invalid ELIM", *argv);
+ encap_limit = uval;
+ flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
+ }
+ } else if (strcmp(*argv, "tos") == 0 ||
+ strcmp(*argv, "tclass") == 0 ||
+ strcmp(*argv, "tc") == 0 ||
+ matches(*argv, "dsfield") == 0) {
+ __u8 uval;
+
+ NEXT_ARG();
+ flowinfo &= ~IP6_FLOWINFO_TCLASS;
+ if (strcmp(*argv, "inherit") == 0)
+ flags |= IP6_TNL_F_USE_ORIG_TCLASS;
+ else {
+ if (get_u8(&uval, *argv, 16))
+ invarg("invalid TClass", *argv);
+ flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
+ flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
+ }
+ } else if (strcmp(*argv, "flowlabel") == 0 ||
+ strcmp(*argv, "fl") == 0) {
+ __u32 uval;
+
+ NEXT_ARG();
+ flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
+ if (strcmp(*argv, "inherit") == 0)
+ flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
+ else {
+ if (get_u32(&uval, *argv, 16))
+ invarg("invalid Flowlabel", *argv);
+ if (uval > 0xFFFFF)
+ invarg("invalid Flowlabel", *argv);
+ flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
+ flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
+ }
+ } else if (strcmp(*argv, "dscp") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0)
+ invarg("not inherit", *argv);
+ flags |= IP6_TNL_F_RCV_DSCP_COPY;
+ } else if (strcmp(*argv, "fwmark") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") == 0) {
+ flags |= IP6_TNL_F_USE_ORIG_FWMARK;
+ fwmark = 0;
+ } else {
+ if (get_u32(&fwmark, *argv, 0))
+ invarg("invalid fwmark\n", *argv);
+ flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
+ }
+ } else if (strcmp(*argv, "allow-localremote") == 0) {
+ flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
+ } else if (strcmp(*argv, "noallow-localremote") == 0) {
+ flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
+ } 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 {
+ ip6tunnel_print_help(lu, argc, argv, stderr);
+ return -1;
+ }
+ argc--, argv++;
+ }
+
+ 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_TTL, hop_limit);
+ addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
+ addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
+ addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
+ 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));
+
+ return 0;
+}
+
+static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+ char s2[64];
+ __u32 flags = 0;
+ __u32 flowinfo = 0;
+ __u8 ttl = 0;
+
+ if (!tb)
+ return;
+
+ if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
+ print_bool(PRINT_ANY, "external", "external ", true);
+ }
+
+ if (tb[IFLA_IPTUN_FLAGS])
+ flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
+
+ if (tb[IFLA_IPTUN_FLOWINFO])
+ flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
+
+ if (tb[IFLA_IPTUN_PROTO]) {
+ switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
+ case IPPROTO_IPIP:
+ print_string(PRINT_ANY, "proto", "%s ", "ipip6");
+ break;
+ case IPPROTO_IPV6:
+ print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
+ break;
+ case 0:
+ print_string(PRINT_ANY, "proto", "%s ", "any");
+ break;
+ }
+ }
+
+ tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET6);
+ tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET6);
+
+ 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", "hoplimit %u ", ttl);
+ else
+ print_string(PRINT_FP, NULL, "hoplimit %s ", "inherit");
+
+ if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) {
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_ign_encap_limit",
+ "encaplimit none ",
+ true);
+ } else if (tb[IFLA_IPTUN_ENCAP_LIMIT]) {
+ __u8 val = rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]);
+
+ print_uint(PRINT_ANY, "encap_limit", "encaplimit %u ", val);
+ }
+
+ if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_use_orig_tclass",
+ "tclass inherit ",
+ true);
+ } else if (tb[IFLA_IPTUN_FLOWINFO]) {
+ __u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20;
+
+ snprintf(s2, sizeof(s2), "0x%02x", val);
+ print_string(PRINT_ANY, "tclass", "tclass %s ", s2);
+ }
+
+ if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_use_orig_flowlabel",
+ "flowlabel inherit ",
+ true);
+ } else if (tb[IFLA_IPTUN_FLOWINFO]) {
+ __u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL);
+
+ snprintf(s2, sizeof(s2), "0x%05x", val);
+ print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2);
+ }
+
+ if (flags & IP6_TNL_F_RCV_DSCP_COPY)
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_rcv_dscp_copy",
+ "dscp inherit ",
+ true);
+
+ if (flags & IP6_TNL_F_MIP6_DEV)
+ print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);
+
+ if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_allow_local_remote",
+ "allow-localremote ",
+ true);
+
+ if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
+ print_bool(PRINT_ANY,
+ "ip6_tnl_f_use_orig_fwmark",
+ "fwmark inherit ",
+ true);
+ } else 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 ip6tnl_link_util = {
+ .id = "ip6tnl",
+ .maxattr = IFLA_IPTUN_MAX,
+ .parse_opt = ip6tunnel_parse_opt,
+ .print_opt = ip6tunnel_print_opt,
+ .print_help = ip6tunnel_print_help,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 03:39:29 +0000