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Date: Thu, 15 Oct 2015 13:13:39 +0200
From: Thomas Graf <tgraf@...g.ch>
To: stephen@...workplumber.org
Cc: netdev@...r.kernel.org, roopa@...ulusnetworks.com,
jbenc@...hat.com, mengke.liu@...el.com, tom@...bertland.com
Subject: [PATCH 2/3] lwtunnel: Add encapsulation support to ip route
From: Roopa Prabhu <roopa@...ulusnetworks.com>
This patch adds support to parse and print lwtunnel
encapsulation attributes attached to routes for MPLS
and IP tunnels.
example:
Add ipv4 route with mpls encap attributes:
Examples:
MPLS:
$ ip route add 40.1.2.0/30 encap mpls 200 via inet 40.1.1.1 dev eth3
$ ip route show
40.1.2.0/30 encap mpls 200 via 40.1.1.1 dev eth3
Add ipv4 multipath route with mpls encap attributes:
$ ip route add 10.1.1.0/30 nexthop encap mpls 200 via 10.1.1.1 dev eth0 \
nexthop encap mpls 700 via 40.1.1.2 dev eth3
$ ip route show
10.1.1.0/30
nexthop encap mpls 200 via 10.1.1.1 dev eth0 weight 1
nexthop encap mpls 700 via 40.1.1.2 dev eth3 weight 1
IP:
$ ip route add 10.1.1.1/24 encap ip id 200 dst 20.1.1.1 dev vxlan0
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
include/utils.h | 3 +
ip/Makefile | 2 +-
ip/iproute.c | 39 +++++++--
ip/iproute_lwtunnel.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++
ip/iproute_lwtunnel.h | 8 ++
5 files changed, 274 insertions(+), 6 deletions(-)
create mode 100644 ip/iproute_lwtunnel.c
create mode 100644 ip/iproute_lwtunnel.h
diff --git a/include/utils.h b/include/utils.h
index f77edeb..1b4cb55 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -191,6 +191,9 @@ void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);
__attribute__ ((format (printf, (pos_str), (pos_args))))
#endif
+#define htonll(x) ((1==htonl(1)) ? (x) : ((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
+#define ntohll(x) ((1==ntohl(1)) ? (x) : ((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
+
extern int cmdlineno;
ssize_t getcmdline(char **line, size_t *len, FILE *in);
int makeargs(char *line, char *argv[], int maxargs);
diff --git a/ip/Makefile b/ip/Makefile
index 52b76ef..f3d2987 100644
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -7,7 +7,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \
link_iptnl.o link_gre6.o iplink_bond.o iplink_bond_slave.o iplink_hsr.o \
iplink_bridge.o iplink_bridge_slave.o ipfou.o iplink_ipvlan.o \
- iplink_geneve.o iplink_vrf.o
+ iplink_geneve.o iplink_vrf.o iproute_lwtunnel.o
RTMONOBJ=rtmon.o
diff --git a/ip/iproute.c b/ip/iproute.c
index da25548..171bd31 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -29,6 +29,7 @@
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
+#include "iproute_lwtunnel.h"
#ifndef RTAX_RTTVAR
#define RTAX_RTTVAR RTAX_HOPS
@@ -76,7 +77,8 @@ static void usage(void)
fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
- fprintf(stderr, "NH := [ via [ FAMILY ] ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
+ fprintf(stderr, "NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n");
+ fprintf(stderr, " [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
fprintf(stderr, "FAMILY := [ inet | inet6 | ipx | dnet | mpls | bridge | link ]\n");
fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n");
fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
@@ -95,6 +97,8 @@ static void usage(void)
fprintf(stderr, "TIME := NUMBER[s|ms]\n");
fprintf(stderr, "BOOL := [1|0]\n");
fprintf(stderr, "FEATURES := ecn\n");
+ fprintf(stderr, "ENCAPTYPE := [ mpls | ip | ip6 ]\n");
+ fprintf(stderr, "ENCAPHDR := [ MPLSLABEL ]\n");
exit(-1);
}
@@ -401,6 +405,10 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
abuf, sizeof(abuf))
);
}
+
+ if (tb[RTA_ENCAP])
+ lwt_print_encap(fp, tb[RTA_ENCAP_TYPE], tb[RTA_ENCAP]);
+
if (r->rtm_tos && filter.tosmask != -1) {
SPRINT_BUF(b1);
fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
@@ -633,6 +641,12 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
fprintf(fp, "%s\tnexthop", _SL_);
if (nh->rtnh_len > sizeof(*nh)) {
parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
+
+ if (tb[RTA_ENCAP])
+ lwt_print_encap(fp,
+ tb[RTA_ENCAP_TYPE],
+ tb[RTA_ENCAP]);
+
if (tb[RTA_GATEWAY]) {
fprintf(fp, " via %s ",
format_host(r->rtm_family,
@@ -704,9 +718,8 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
return 0;
}
-
-static int parse_one_nh(struct rtmsg *r, struct rtattr *rta,
- struct rtnexthop *rtnh,
+static int parse_one_nh(struct nlmsghdr *n, struct rtmsg *r,
+ struct rtattr *rta, struct rtnexthop *rtnh,
int *argcp, char ***argvp)
{
int argc = *argcp;
@@ -753,6 +766,11 @@ static int parse_one_nh(struct rtmsg *r, struct rtattr *rta,
invarg("\"realm\" value is invalid\n", *argv);
rta_addattr32(rta, 4096, RTA_FLOW, realm);
rtnh->rtnh_len += sizeof(struct rtattr) + 4;
+ } else if (strcmp(*argv, "encap") == 0) {
+ int len = rta->rta_len;
+
+ lwt_parse_encap(rta, 4096, &argc, &argv);
+ rtnh->rtnh_len += rta->rta_len - len;
} else
break;
}
@@ -784,7 +802,7 @@ static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
memset(rtnh, 0, sizeof(*rtnh));
rtnh->rtnh_len = sizeof(*rtnh);
rta->rta_len += rtnh->rtnh_len;
- parse_one_nh(r, rta, rtnh, &argc, &argv);
+ parse_one_nh(n, r, rta, rtnh, &argc, &argv);
rtnh = RTNH_NEXT(rtnh);
}
@@ -1092,6 +1110,17 @@ static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
else if (get_u8(&pref, *argv, 0))
invarg("\"pref\" value is invalid\n", *argv);
addattr8(&req.n, sizeof(req), RTA_PREF, pref);
+ } else if (strcmp(*argv, "encap") == 0) {
+ char buf[1024];
+ struct rtattr *rta = (void*)buf;
+
+ rta->rta_type = RTA_ENCAP;
+ rta->rta_len = RTA_LENGTH(0);
+
+ lwt_parse_encap(rta, sizeof(buf), &argc, &argv);
+
+ if (rta->rta_len > RTA_LENGTH(0))
+ addraw_l(&req.n, 1024, RTA_DATA(rta), RTA_PAYLOAD(rta));
} else {
int type;
inet_prefix dst;
diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
new file mode 100644
index 0000000..63322a1
--- /dev/null
+++ b/ip/iproute_lwtunnel.c
@@ -0,0 +1,228 @@
+/*
+ * iproute_lwtunnel.c
+ *
+ * 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: Roopa Prabhu, <roopa@...ulusnetworks.com>
+ * Thomas Graf <tgraf@...g.ch>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <linux/lwtunnel.h>
+#include <linux/mpls_iptunnel.h>
+#include <errno.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "iproute_lwtunnel.h"
+
+static int read_encap_type(const char *name)
+{
+ if (strcmp(name, "mpls") == 0)
+ return LWTUNNEL_ENCAP_MPLS;
+ else if (strcmp(name, "ip") == 0)
+ return LWTUNNEL_ENCAP_IP;
+ else if (strcmp(name, "ip6") == 0)
+ return LWTUNNEL_ENCAP_IP6;
+ else
+ return LWTUNNEL_ENCAP_NONE;
+}
+
+static const char *format_encap_type(int type)
+{
+ switch (type) {
+ case LWTUNNEL_ENCAP_MPLS:
+ return "mpls";
+ case LWTUNNEL_ENCAP_IP:
+ return "ip";
+ case LWTUNNEL_ENCAP_IP6:
+ return "ip6";
+ default:
+ return "unknown";
+ }
+}
+
+static void print_encap_mpls(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[MPLS_IPTUNNEL_MAX+1];
+ char abuf[256];
+
+ parse_rtattr_nested(tb, MPLS_IPTUNNEL_MAX, encap);
+
+ if (tb[MPLS_IPTUNNEL_DST])
+ fprintf(fp, " %s ", format_host(AF_MPLS,
+ RTA_PAYLOAD(tb[MPLS_IPTUNNEL_DST]),
+ RTA_DATA(tb[MPLS_IPTUNNEL_DST]),
+ abuf, sizeof(abuf)));
+}
+
+static void print_encap_ip(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[LWTUNNEL_IP_MAX+1];
+ char abuf[256];
+
+ parse_rtattr_nested(tb, LWTUNNEL_IP_MAX, encap);
+
+ if (tb[LWTUNNEL_IP_ID])
+ fprintf(fp, "id %llu ", ntohll(rta_getattr_u64(tb[LWTUNNEL_IP_ID])));
+
+ if (tb[LWTUNNEL_IP_SRC])
+ fprintf(fp, "src %s ",
+ rt_addr_n2a(AF_INET,
+ RTA_PAYLOAD(tb[LWTUNNEL_IP_SRC]),
+ RTA_DATA(tb[LWTUNNEL_IP_SRC]),
+ abuf, sizeof(abuf)));
+
+ if (tb[LWTUNNEL_IP_DST])
+ fprintf(fp, "dst %s ",
+ rt_addr_n2a(AF_INET,
+ RTA_PAYLOAD(tb[LWTUNNEL_IP_DST]),
+ RTA_DATA(tb[LWTUNNEL_IP_DST]),
+ abuf, sizeof(abuf)));
+
+ if (tb[LWTUNNEL_IP_TTL])
+ fprintf(fp, "ttl %d ", rta_getattr_u8(tb[LWTUNNEL_IP_TTL]));
+
+ if (tb[LWTUNNEL_IP_TOS])
+ fprintf(fp, "tos %d ", rta_getattr_u8(tb[LWTUNNEL_IP_TOS]));
+}
+
+void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
+ struct rtattr *encap)
+{
+ int et;
+
+ if (!encap_type)
+ return;
+
+ et = rta_getattr_u16(encap_type);
+
+ fprintf(fp, " encap %s", format_encap_type(et));
+
+ switch (et) {
+ case LWTUNNEL_ENCAP_MPLS:
+ print_encap_mpls(fp, encap);
+ break;
+ case LWTUNNEL_ENCAP_IP:
+ print_encap_ip(fp, encap);
+ break;
+ }
+}
+
+static int parse_encap_mpls(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
+{
+ inet_prefix addr;
+ int argc = *argcp;
+ char **argv = *argvp;
+
+ if (get_addr(&addr, *argv, AF_MPLS)) {
+ fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", *argv);
+ exit(1);
+ }
+
+ rta_addattr_l(rta, len, MPLS_IPTUNNEL_DST, &addr.data,
+ addr.bytelen);
+
+ *argcp = argc;
+ *argvp = argv;
+
+ return 0;
+}
+
+static int parse_encap_ip(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
+{
+ int id_ok = 0, dst_ok = 0, tos_ok = 0, ttl_ok = 0;
+ char **argv = *argvp;
+ int argc = *argcp;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "id") == 0) {
+ __u64 id;
+ NEXT_ARG();
+ if (id_ok++)
+ duparg2("id", *argv);
+ if (get_u64(&id, *argv, 0))
+ invarg("\"id\" value is invalid\n", *argv);
+ rta_addattr64(rta, len, LWTUNNEL_IP_ID, htonll(id));
+ } else if (strcmp(*argv, "dst") == 0) {
+ inet_prefix addr;
+ NEXT_ARG();
+ if (dst_ok++)
+ duparg2("dst", *argv);
+ get_addr(&addr, *argv, AF_INET);
+ rta_addattr_l(rta, len, LWTUNNEL_IP_DST, &addr.data, addr.bytelen);
+ } else if (strcmp(*argv, "tos") == 0) {
+ __u32 tos;
+ NEXT_ARG();
+ if (tos_ok++)
+ duparg2("tos", *argv);
+ if (rtnl_dsfield_a2n(&tos, *argv))
+ invarg("\"tos\" value is invalid\n", *argv);
+ rta_addattr8(rta, len, LWTUNNEL_IP_TOS, tos);
+ } else if (strcmp(*argv, "ttl") == 0) {
+ __u8 ttl;
+ NEXT_ARG();
+ if (ttl_ok++)
+ duparg2("ttl", *argv);
+ if (get_u8(&ttl, *argv, 0))
+ invarg("\"ttl\" value is invalid\n", *argv);
+ rta_addattr8(rta, len, LWTUNNEL_IP_TTL, ttl);
+ } else {
+ break;
+ }
+ }
+
+ *argcp = argc;
+ *argvp = argv;
+
+ return 0;
+}
+
+
+int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
+{
+ struct rtattr *nest;
+ int argc = *argcp;
+ char **argv = *argvp;
+ __u16 type;
+
+ NEXT_ARG();
+ type = read_encap_type(*argv);
+ if (!type)
+ invarg("\"encap type\" value is invalid\n", *argv);
+
+ NEXT_ARG();
+ if (argc <= 1) {
+ fprintf(stderr, "Error: unexpected end of line after \"encap\"\n");
+ exit(-1);
+ }
+
+ nest = rta_nest(rta, 1024, RTA_ENCAP);
+ switch (type) {
+ case LWTUNNEL_ENCAP_MPLS:
+ parse_encap_mpls(rta, len, &argc, &argv);
+ break;
+ case LWTUNNEL_ENCAP_IP:
+ parse_encap_ip(rta, len, &argc, &argv);
+ break;
+ default:
+ fprintf(stderr, "Error: unsupported encap type\n");
+ break;
+ }
+ rta_nest_end(rta, nest);
+
+ rta_addattr16(rta, 1024, RTA_ENCAP_TYPE, type);
+
+ *argcp = argc;
+ *argvp = argv;
+
+ return 0;
+}
diff --git a/ip/iproute_lwtunnel.h b/ip/iproute_lwtunnel.h
new file mode 100644
index 0000000..b82b58a
--- /dev/null
+++ b/ip/iproute_lwtunnel.h
@@ -0,0 +1,8 @@
+#ifndef __LWTUNNEL_H__
+#define __LETUNNEL_H__ 1
+
+int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp);
+void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
+ struct rtattr *encap);
+
+#endif
--
2.4.3
--
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