From 237d9e82c56918a1c972e6f30dd3cf1cfb957412 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Thu, 9 Oct 2008 15:08:24 +0800 Subject: [PATCH] ip: gre: Add GRE configuration support through rtnl_link This patch adds support for configuring GRE tunnels using the new rtnl_link interface. This only works on kernels that have the new GRE configuration interface. This is accessed through the "ip link" command. The previous tunnel configuration interface "ip tunnel" remains as it is and should be retained for compatibility with old kernels. Signed-off-by: Herbert Xu --- ip/Makefile | 2 +- ip/link_gre.c | 294 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 295 insertions(+), 1 deletion(-) create mode 100644 ip/link_gre.c diff --git a/ip/Makefile b/ip/Makefile index 73978ffc..98ba876c 100644 --- a/ip/Makefile +++ b/ip/Makefile @@ -2,7 +2,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o \ rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \ ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o \ ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o \ - iplink_vlan.o link_veth.o + iplink_vlan.o link_veth.o link_gre.o RTMONOBJ=rtmon.o diff --git a/ip/link_gre.c b/ip/link_gre.c new file mode 100644 index 00000000..e92b0d37 --- /dev/null +++ b/ip/link_gre.c @@ -0,0 +1,294 @@ +/* + * link_gre.c gre 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: Herbert Xu + * + */ + +#include +#include +#include +#include +#include +#include + +#include "rt_names.h" +#include "utils.h" +#include "ip_common.h" +#include "tunnel.h" + +static void usage(void) __attribute__((noreturn)); +static void usage(void) +{ + fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n"); + fprintf(stderr, " type { gre | gretap } [ remote ADDR ] [ local ADDR ]\n"); + fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"); + fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"); + fprintf(stderr, "\n"); + fprintf(stderr, "Where: NAME := STRING\n"); + fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n"); + fprintf(stderr, " TOS := { NUMBER | inherit }\n"); + fprintf(stderr, " TTL := { 1..255 | inherit }\n"); + fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); + exit(-1); +} + +static int gre_parse_opt(struct link_util *lu, int argc, char **argv, + struct nlmsghdr *n) +{ + __u16 iflags = 0; + __u16 oflags = 0; + unsigned ikey = 0; + unsigned okey = 0; + unsigned saddr = 0; + unsigned daddr = 0; + + while (argc > 0) { + if (!matches(*argv, "key")) { + unsigned uval; + + NEXT_ARG(); + iflags |= GRE_KEY; + oflags |= GRE_KEY; + if (strchr(*argv, '.')) + uval = get_addr32(*argv); + else { + if (get_unsigned(&uval, *argv, 0) < 0) { + fprintf(stderr, + "Invalid value for \"key\"\n"); + exit(-1); + } + uval = htonl(uval); + } + + ikey = okey = uval; + } else if (!matches(*argv, "ikey")) { + unsigned uval; + + NEXT_ARG(); + iflags |= GRE_KEY; + if (strchr(*argv, '.')) + uval = get_addr32(*argv); + else { + if (get_unsigned(&uval, *argv, 0)<0) { + fprintf(stderr, "invalid value of \"ikey\"\n"); + exit(-1); + } + uval = htonl(uval); + } + ikey = uval; + } else if (!matches(*argv, "okey")) { + unsigned uval; + + NEXT_ARG(); + oflags |= GRE_KEY; + if (strchr(*argv, '.')) + uval = get_addr32(*argv); + else { + if (get_unsigned(&uval, *argv, 0)<0) { + fprintf(stderr, "invalid value of \"okey\"\n"); + exit(-1); + } + uval = htonl(uval); + } + okey = uval; + } else if (!matches(*argv, "seq")) { + iflags |= GRE_SEQ; + oflags |= GRE_SEQ; + } else if (!matches(*argv, "iseq")) { + iflags |= GRE_SEQ; + } else if (!matches(*argv, "oseq")) { + oflags |= GRE_SEQ; + } else if (!matches(*argv, "csum")) { + iflags |= GRE_CSUM; + oflags |= GRE_CSUM; + } else if (!matches(*argv, "icsum")) { + iflags |= GRE_CSUM; + } else if (!matches(*argv, "ocsum")) { + oflags |= GRE_CSUM; + } else if (!matches(*argv, "nopmtudisc")) { + __u8 val = 0; + + addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &val, 1); + } else if (!matches(*argv, "pmtudisc")) { + __u8 val = 1; + + addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &val, 1); + } else if (!matches(*argv, "remote")) { + NEXT_ARG(); + if (strcmp(*argv, "any")) + daddr = get_addr32(*argv); + } else if (!matches(*argv, "local")) { + NEXT_ARG(); + if (strcmp(*argv, "any")) + saddr = get_addr32(*argv); + } else if (!matches(*argv, "dev")) { + unsigned link; + + NEXT_ARG(); + link = tnl_ioctl_get_ifindex(*argv); + if (link == 0) + exit(-1); + + addattr32(n, 1024, IFLA_GRE_LINK, link); + } else if (!matches(*argv, "ttl") || + !matches(*argv, "hoplimit")) { + unsigned uval; + __u8 ttl; + + NEXT_ARG(); + if (strcmp(*argv, "inherit") != 0) { + if (get_unsigned(&uval, *argv, 0)) + invarg("invalid TTL\n", *argv); + if (uval > 255) + invarg("TTL must be <= 255\n", *argv); + ttl = uval; + addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1); + } + } else if (!matches(*argv, "tos") || + !matches(*argv, "tclass") || + !matches(*argv, "dsfield")) { + __u32 uval; + __u8 tos; + + NEXT_ARG(); + if (strcmp(*argv, "inherit") != 0) { + if (rtnl_dsfield_a2n(&uval, *argv)) + invarg("bad TOS value", *argv); + tos = uval; + } else + tos = 1; + addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1); + } else + usage(); + argc--; argv++; + } + + if (!ikey && IN_MULTICAST(ntohl(daddr))) { + ikey = daddr; + iflags |= GRE_KEY; + } + if (!okey && IN_MULTICAST(ntohl(daddr))) { + okey = daddr; + oflags |= GRE_KEY; + } + if (IN_MULTICAST(ntohl(daddr)) && !saddr) { + fprintf(stderr, "Broadcast tunnel requires a source address.\n"); + return -1; + } + + addattr32(n, 1024, IFLA_GRE_IKEY, ikey); + addattr32(n, 1024, IFLA_GRE_OKEY, okey); + addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2); + addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2); + addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4); + addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4); + + return 0; +} + +static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) +{ + char s1[1024]; + char s2[64]; + const char *local = "any"; + const char *remote = "any"; + unsigned iflags = 0; + unsigned oflags = 0; + + if (!tb) + return; + + if (tb[IFLA_GRE_REMOTE]) { + unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_GRE_REMOTE]); + + if (addr) + remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1)); + } + + fprintf(f, "remote %s ", remote); + + if (tb[IFLA_GRE_LOCAL]) { + unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_GRE_LOCAL]); + + if (addr) + local = format_host(AF_INET, 4, &addr, s1, sizeof(s1)); + } + + fprintf(f, "local %s ", local); + + if (tb[IFLA_GRE_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_GRE_LINK])) { + unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_GRE_LINK]); + char *n = tnl_ioctl_get_ifname(link); + + if (n) + fprintf(f, "dev %s ", n); + else + fprintf(f, "dev %u ", link); + } + + if (tb[IFLA_GRE_TTL] && *(__u8 *)RTA_DATA(tb[IFLA_GRE_TTL])) + fprintf(f, "ttl %d ", *(__u8 *)RTA_DATA(tb[IFLA_GRE_TTL])); + else + fprintf(f, "ttl inherit "); + + if (tb[IFLA_GRE_TOS] && *(__u8 *)RTA_DATA(tb[IFLA_GRE_TOS])) { + int tos = *(__u8 *)RTA_DATA(tb[IFLA_GRE_TOS]); + + fputs("tos ", f); + if (tos == 1) + fputs("inherit ", f); + else + fprintf(f, "0x%x ", tos); + } + + if (tb[IFLA_GRE_PMTUDISC] && + !*(__u8 *)RTA_DATA(tb[IFLA_GRE_PMTUDISC])) + fputs("nopmtudisc ", f); + + if (tb[IFLA_GRE_IFLAGS]) + iflags = *(__u16 *)RTA_DATA(tb[IFLA_GRE_IFLAGS]); + + if (tb[IFLA_GRE_OFLAGS]) + oflags = *(__u16 *)RTA_DATA(tb[IFLA_GRE_OFLAGS]); + + if (iflags & GRE_KEY && tb[IFLA_GRE_IKEY] && + *(__u32 *)RTA_DATA(tb[IFLA_GRE_IKEY])) { + inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2)); + fprintf(f, "ikey %s ", s2); + } + + if (oflags & GRE_KEY && tb[IFLA_GRE_OKEY] && + *(__u32 *)RTA_DATA(tb[IFLA_GRE_OKEY])) { + inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2)); + fprintf(f, "ikey %s ", s2); + } + + if (iflags & GRE_SEQ) + fputs("iseq ", f); + if (oflags & GRE_SEQ) + fputs("oseq ", f); + if (iflags & GRE_CSUM) + fputs("icsum ", f); + if (oflags & GRE_CSUM) + fputs("ocsum ", f); +} + +struct link_util gre_link_util = { + .id = "gre", + .maxattr = IFLA_GRE_MAX, + .parse_opt = gre_parse_opt, + .print_opt = gre_print_opt, +}; + +struct link_util gretap_link_util = { + .id = "gretap", + .maxattr = IFLA_GRE_MAX, + .parse_opt = gre_parse_opt, + .print_opt = gre_print_opt, +};