blob: 0461e5d06ef31c3ba7d3625f96838366da7b4af7 [file] [log] [blame]
/*
* 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 <herbert@gondor.apana.org.au>
*
*/
#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 "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"
static bool gre_is_erspan(struct link_util *lu)
{
return !strcmp(lu->id, "erspan");
}
static void gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f)
{
bool is_erspan = gre_is_erspan(lu);
fprintf(f,
"Usage: ... %-9s [ remote ADDR ]\n"
" [ local ADDR ]\n"
" [ [no][i|o]seq ]\n"
" [ [i|o]key KEY | no[i|o]key ]\n"
" [ [no][i|o]csum ]\n"
" [ ttl TTL ]\n"
" [ tos TOS ]\n"
" [ [no]pmtudisc ]\n"
" [ [no]ignore-df ]\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", lu->id);
if (is_erspan)
fprintf(f,
" [ erspan_ver version ]\n"
" [ erspan IDX ]\n"
" [ erspan_dir { ingress | egress } ]\n"
" [ erspan_hwid hwid ]\n");
fprintf(f,
"\n"
"Where: ADDR := { IP_ADDRESS | any }\n"
" TOS := { NUMBER | inherit }\n"
" TTL := { 1..255 | inherit }\n"
" KEY := { DOTTED_QUAD | NUMBER }\n"
" MARK := { 0x0..0xffffffff }\n");
}
static int gre_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 *greinfo[IFLA_GRE_MAX + 1];
int len;
__u16 iflags = 0;
__u16 oflags = 0;
__be32 ikey = 0;
__be32 okey = 0;
inet_prefix saddr, daddr;
__u8 pmtudisc = 1;
__u8 ignore_df = 0;
__u8 tos = 0;
__u8 ttl = 0;
__u32 link = 0;
__u16 encaptype = 0;
__u16 encapflags = 0;
__u16 encapsport = 0;
__u16 encapdport = 0;
__u8 metadata = 0;
__u32 fwmark = 0;
bool is_erspan = gre_is_erspan(lu);
__u32 erspan_idx = 0;
__u8 erspan_ver = 1;
__u8 erspan_dir = 0;
__u16 erspan_hwid = 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(greinfo, IFLA_GRE_MAX,
linkinfo[IFLA_INFO_DATA]);
rta = greinfo[IFLA_GRE_LOCAL];
if (rta && get_addr_rta(&saddr, rta, AF_INET))
goto get_failed;
rta = greinfo[IFLA_GRE_REMOTE];
if (rta && get_addr_rta(&daddr, rta, AF_INET))
goto get_failed;
if (greinfo[IFLA_GRE_IKEY])
ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
if (greinfo[IFLA_GRE_OKEY])
okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
if (greinfo[IFLA_GRE_IFLAGS])
iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
if (greinfo[IFLA_GRE_OFLAGS])
oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
if (greinfo[IFLA_GRE_PMTUDISC])
pmtudisc = rta_getattr_u8(
greinfo[IFLA_GRE_PMTUDISC]);
if (greinfo[IFLA_GRE_IGNORE_DF])
ignore_df =
!!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
if (greinfo[IFLA_GRE_TOS])
tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
if (greinfo[IFLA_GRE_TTL])
ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
if (greinfo[IFLA_GRE_LINK])
link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
if (greinfo[IFLA_GRE_ENCAP_TYPE])
encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
if (greinfo[IFLA_GRE_ENCAP_FLAGS])
encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
if (greinfo[IFLA_GRE_ENCAP_SPORT])
encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
if (greinfo[IFLA_GRE_ENCAP_DPORT])
encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
if (greinfo[IFLA_GRE_COLLECT_METADATA])
metadata = 1;
if (greinfo[IFLA_GRE_FWMARK])
fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
if (greinfo[IFLA_GRE_ERSPAN_INDEX])
erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
if (greinfo[IFLA_GRE_ERSPAN_VER])
erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
if (greinfo[IFLA_GRE_ERSPAN_DIR])
erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
if (greinfo[IFLA_GRE_ERSPAN_HWID])
erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
free(answer);
}
while (argc > 0) {
if (!matches(*argv, "key")) {
NEXT_ARG();
iflags |= GRE_KEY;
oflags |= GRE_KEY;
ikey = okey = tnl_parse_key("key", *argv);
} else if (!matches(*argv, "nokey")) {
iflags &= ~GRE_KEY;
oflags &= ~GRE_KEY;
ikey = okey = 0;
} else if (!matches(*argv, "ikey")) {
NEXT_ARG();
iflags |= GRE_KEY;
ikey = tnl_parse_key("ikey", *argv);
} else if (!matches(*argv, "noikey")) {
iflags &= ~GRE_KEY;
ikey = 0;
} else if (!matches(*argv, "okey")) {
NEXT_ARG();
oflags |= GRE_KEY;
okey = tnl_parse_key("okey", *argv);
} else if (!matches(*argv, "nookey")) {
oflags &= ~GRE_KEY;
okey = 0;
} else if (!matches(*argv, "seq")) {
iflags |= GRE_SEQ;
oflags |= GRE_SEQ;
} else if (!matches(*argv, "noseq")) {
iflags &= ~GRE_SEQ;
oflags &= ~GRE_SEQ;
} else if (!matches(*argv, "iseq")) {
iflags |= GRE_SEQ;
} else if (!matches(*argv, "noiseq")) {
iflags &= ~GRE_SEQ;
} else if (!matches(*argv, "oseq")) {
oflags |= GRE_SEQ;
} else if (!matches(*argv, "nooseq")) {
oflags &= ~GRE_SEQ;
} else if (!matches(*argv, "csum")) {
iflags |= GRE_CSUM;
oflags |= GRE_CSUM;
} else if (!matches(*argv, "nocsum")) {
iflags &= ~GRE_CSUM;
oflags &= ~GRE_CSUM;
} else if (!matches(*argv, "icsum")) {
iflags |= GRE_CSUM;
} else if (!matches(*argv, "noicsum")) {
iflags &= ~GRE_CSUM;
} else if (!matches(*argv, "ocsum")) {
oflags |= GRE_CSUM;
} else if (!matches(*argv, "noocsum")) {
oflags &= ~GRE_CSUM;
} else if (!matches(*argv, "nopmtudisc")) {
pmtudisc = 0;
} else if (!matches(*argv, "pmtudisc")) {
pmtudisc = 1;
} else if (!matches(*argv, "remote")) {
NEXT_ARG();
get_addr(&daddr, *argv, AF_INET);
} else if (!matches(*argv, "local")) {
NEXT_ARG();
get_addr(&saddr, *argv, AF_INET);
} else if (!matches(*argv, "dev")) {
NEXT_ARG();
link = ll_name_to_index(*argv);
if (!link)
exit(nodev(*argv));
} else if (!matches(*argv, "ttl") ||
!matches(*argv, "hoplimit") ||
!matches(*argv, "hlim")) {
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (get_u8(&ttl, *argv, 0))
invarg("invalid TTL\n", *argv);
} else
ttl = 0;
} else if (!matches(*argv, "tos") ||
!matches(*argv, "tclass") ||
!matches(*argv, "dsfield")) {
__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, "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, "ignore-df") == 0) {
ignore_df = 1;
} else if (strcmp(*argv, "noignore-df") == 0) {
/*
*only the lsb is significant, use 2 for presence
*/
ignore_df = 2;
} else if (strcmp(*argv, "fwmark") == 0) {
NEXT_ARG();
if (get_u32(&fwmark, *argv, 0))
invarg("invalid fwmark\n", *argv);
} else if (is_erspan && strcmp(*argv, "erspan") == 0) {
NEXT_ARG();
if (get_u32(&erspan_idx, *argv, 0))
invarg("invalid erspan index\n", *argv);
if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
} else if (is_erspan && strcmp(*argv, "erspan_ver") == 0) {
NEXT_ARG();
if (get_u8(&erspan_ver, *argv, 0))
invarg("invalid erspan version\n", *argv);
if (erspan_ver > 2)
invarg("erspan version must be 0/1/2\n", *argv);
} else if (is_erspan && strcmp(*argv, "erspan_dir") == 0) {
NEXT_ARG();
if (matches(*argv, "ingress") == 0)
erspan_dir = 0;
else if (matches(*argv, "egress") == 0)
erspan_dir = 1;
else
invarg("Invalid erspan direction.", *argv);
} else if (is_erspan && strcmp(*argv, "erspan_hwid") == 0) {
NEXT_ARG();
if (get_u16(&erspan_hwid, *argv, 0))
invarg("invalid erspan hwid\n", *argv);
} else {
gre_print_help(lu, argc, argv, stderr);
return -1;
}
argc--; argv++;
}
if (is_addrtype_inet_multi(&daddr)) {
if (!ikey) {
ikey = daddr.data[0];
iflags |= GRE_KEY;
}
if (!okey) {
okey = daddr.data[0];
oflags |= GRE_KEY;
}
if (!is_addrtype_inet_not_unspec(&saddr)) {
fprintf(stderr,
"A broadcast tunnel requires a source address.\n");
return -1;
}
}
if (metadata) {
addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
return 0;
}
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);
if (is_addrtype_inet_not_unspec(&saddr))
addattr_l(n, 1024, IFLA_GRE_LOCAL, saddr.data, saddr.bytelen);
if (is_addrtype_inet_not_unspec(&daddr))
addattr_l(n, 1024, IFLA_GRE_REMOTE, daddr.data, daddr.bytelen);
addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
if (ignore_df)
addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
if (link)
addattr32(n, 1024, IFLA_GRE_LINK, link);
addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
if (is_erspan) {
addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
if (erspan_ver == 1 && erspan_idx != 0) {
addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
} else if (erspan_ver == 2) {
addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
}
}
addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
return 0;
}
static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
char s2[64];
__u16 iflags = 0;
__u16 oflags = 0;
__u8 ttl = 0;
__u8 tos = 0;
if (!tb)
return;
if (tb[IFLA_GRE_COLLECT_METADATA]) {
print_bool(PRINT_ANY, "external", "external ", true);
return;
}
tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET);
tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET);
if (tb[IFLA_GRE_LINK]) {
__u32 link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
if (link) {
print_string(PRINT_ANY, "link", "dev %s ",
ll_index_to_name(link));
}
}
if (tb[IFLA_GRE_TTL])
ttl = rta_getattr_u8(tb[IFLA_GRE_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_GRE_TOS])
tos = rta_getattr_u8(tb[IFLA_GRE_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_GRE_PMTUDISC]) {
if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
else
print_bool(PRINT_JSON, "pmtudisc", NULL, true);
}
if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
if (tb[IFLA_GRE_IFLAGS])
iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
if (tb[IFLA_GRE_OFLAGS])
oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
}
if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
print_string(PRINT_ANY, "okey", "okey %s ", s2);
}
if (iflags & GRE_SEQ)
print_bool(PRINT_ANY, "iseq", "iseq ", true);
if (oflags & GRE_SEQ)
print_bool(PRINT_ANY, "oseq", "oseq ", true);
if (iflags & GRE_CSUM)
print_bool(PRINT_ANY, "icsum", "icsum ", true);
if (oflags & GRE_CSUM)
print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
if (tb[IFLA_GRE_FWMARK]) {
__u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
if (fwmark) {
print_0xhex(PRINT_ANY,
"fwmark", "fwmark %#llx ", fwmark);
}
}
if (tb[IFLA_GRE_ERSPAN_INDEX]) {
__u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
print_uint(PRINT_ANY,
"erspan_index", "erspan_index %u ", erspan_idx);
}
if (tb[IFLA_GRE_ERSPAN_VER]) {
__u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
print_uint(PRINT_ANY,
"erspan_ver", "erspan_ver %u ", erspan_ver);
}
if (tb[IFLA_GRE_ERSPAN_DIR]) {
__u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
if (erspan_dir == 0)
print_string(PRINT_ANY, "erspan_dir",
"erspan_dir ingress ", NULL);
else
print_string(PRINT_ANY, "erspan_dir",
"erspan_dir egress ", NULL);
}
if (tb[IFLA_GRE_ERSPAN_HWID]) {
__u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
print_0xhex(PRINT_ANY,
"erspan_hwid", "erspan_hwid %#llx ", erspan_hwid);
}
tnl_print_encap(tb,
IFLA_GRE_ENCAP_TYPE,
IFLA_GRE_ENCAP_FLAGS,
IFLA_GRE_ENCAP_SPORT,
IFLA_GRE_ENCAP_DPORT);
}
struct link_util gre_link_util = {
.id = "gre",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};
struct link_util gretap_link_util = {
.id = "gretap",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};
struct link_util erspan_link_util = {
.id = "erspan",
.maxattr = IFLA_GRE_MAX,
.parse_opt = gre_parse_opt,
.print_opt = gre_print_opt,
.print_help = gre_print_help,
};