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Message-Id: <20200520235727.28045-1-alex.aring@gmail.com>
Date: Wed, 20 May 2020 19:57:27 -0400
From: Alexander Aring <alex.aring@...il.com>
To: netdev@...r.kernel.org
Cc: mcr@...delman.ca, stefan@...enfreihafen.org,
Alexander Aring <alex.aring@...il.com>
Subject: [PATCHv2 iproute2-next] lwtunnel: add support for rpl segment routing
This patch adds support for rpl segment routing settings.
Example:
ip -n ns0 -6 route add 2001::3 encap rpl segs \
fe80::c8fe:beef:cafe:cafe,fe80::c8fe:beef:cafe:beef dev lowpan0
Signed-off-by: Alexander Aring <alex.aring@...il.com>
---
changes since v2:
- change output to display segments count and nice segment brackets
- fix json output, sorry.
ip/iproute.c | 2 +-
ip/iproute_lwtunnel.c | 121 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 122 insertions(+), 1 deletion(-)
diff --git a/ip/iproute.c b/ip/iproute.c
index 07c45169..05ec2c29 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -101,7 +101,7 @@ static void usage(void)
"TIME := NUMBER[s|ms]\n"
"BOOL := [1|0]\n"
"FEATURES := ecn\n"
- "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local ]\n"
+ "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local | rpl ]\n"
"ENCAPHDR := [ MPLSLABEL | SEG6HDR ]\n"
"SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n"
"SEGMODE := [ encap | inline ]\n"
diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index ff7c9d7f..9b4f0885 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -29,6 +29,8 @@
#include <linux/seg6.h>
#include <linux/seg6_iptunnel.h>
+#include <linux/rpl.h>
+#include <linux/rpl_iptunnel.h>
#include <linux/seg6_hmac.h>
#include <linux/seg6_local.h>
#include <linux/if_tunnel.h>
@@ -50,6 +52,8 @@ static const char *format_encap_type(int type)
return "seg6";
case LWTUNNEL_ENCAP_SEG6_LOCAL:
return "seg6local";
+ case LWTUNNEL_ENCAP_RPL:
+ return "rpl";
default:
return "unknown";
}
@@ -84,6 +88,8 @@ static int read_encap_type(const char *name)
return LWTUNNEL_ENCAP_SEG6;
else if (strcmp(name, "seg6local") == 0)
return LWTUNNEL_ENCAP_SEG6_LOCAL;
+ else if (strcmp(name, "rpl") == 0)
+ return LWTUNNEL_ENCAP_RPL;
else if (strcmp(name, "help") == 0)
encap_type_usage();
@@ -162,6 +168,42 @@ static void print_encap_seg6(FILE *fp, struct rtattr *encap)
print_srh(fp, tuninfo->srh);
}
+static void print_rpl_srh(FILE *fp, struct ipv6_rpl_sr_hdr *srh)
+{
+ int i;
+
+ if (is_json_context())
+ open_json_array(PRINT_JSON, "segs");
+ else
+ fprintf(fp, "segs %d [ ", srh->segments_left);
+
+ for (i = srh->segments_left - 1; i >= 0; i--) {
+ print_color_string(PRINT_ANY, COLOR_INET6,
+ NULL, "%s ",
+ rt_addr_n2a(AF_INET6, 16, &srh->rpl_segaddr[i]));
+ }
+
+ if (is_json_context())
+ close_json_array(PRINT_JSON, NULL);
+ else
+ fprintf(fp, "] ");
+}
+
+static void print_encap_rpl(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[RPL_IPTUNNEL_MAX + 1];
+ struct ipv6_rpl_sr_hdr *srh;
+
+ parse_rtattr_nested(tb, RPL_IPTUNNEL_MAX, encap);
+
+ if (!tb[RPL_IPTUNNEL_SRH])
+ return;
+
+ srh = RTA_DATA(tb[RPL_IPTUNNEL_SRH]);
+
+ print_rpl_srh(fp, srh);
+}
+
static const char *seg6_action_names[SEG6_LOCAL_ACTION_MAX + 1] = {
[SEG6_LOCAL_ACTION_END] = "End",
[SEG6_LOCAL_ACTION_END_X] = "End.X",
@@ -567,6 +609,9 @@ void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
case LWTUNNEL_ENCAP_SEG6_LOCAL:
print_encap_seg6local(fp, encap);
break;
+ case LWTUNNEL_ENCAP_RPL:
+ print_encap_rpl(fp, encap);
+ break;
}
}
@@ -690,6 +735,79 @@ out:
return ret;
}
+static struct ipv6_rpl_sr_hdr *parse_rpl_srh(char *segbuf)
+{
+ struct ipv6_rpl_sr_hdr *srh;
+ int nsegs = 0;
+ int srhlen;
+ char *s;
+ int i;
+
+ s = segbuf;
+ for (i = 0; *s; *s++ == ',' ? i++ : *s);
+ nsegs = i + 1;
+
+ srhlen = 8 + 16 * nsegs;
+
+ srh = calloc(1, srhlen);
+
+ srh->hdrlen = (srhlen >> 3) - 1;
+ srh->type = 3;
+ srh->segments_left = nsegs;
+
+ for (s = strtok(segbuf, ","); s; s = strtok(NULL, ",")) {
+ inet_prefix addr;
+
+ get_addr(&addr, s, AF_INET6);
+ memcpy(&srh->rpl_segaddr[i], addr.data, sizeof(struct in6_addr));
+ i--;
+ }
+
+ return srh;
+}
+
+static int parse_encap_rpl(struct rtattr *rta, size_t len, int *argcp,
+ char ***argvp)
+{
+ struct ipv6_rpl_sr_hdr *srh;
+ char **argv = *argvp;
+ char segbuf[1024] = "";
+ int argc = *argcp;
+ int segs_ok = 0;
+ int ret = 0;
+ int srhlen;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "segs") == 0) {
+ NEXT_ARG();
+ if (segs_ok++)
+ duparg2("segs", *argv);
+
+ strlcpy(segbuf, *argv, 1024);
+ } else {
+ break;
+ }
+ argc--; argv++;
+ }
+
+ srh = parse_rpl_srh(segbuf);
+ srhlen = (srh->hdrlen + 1) << 3;
+
+ if (rta_addattr_l(rta, len, RPL_IPTUNNEL_SRH, srh,
+ srhlen)) {
+ ret = -1;
+ goto out;
+ }
+
+ *argcp = argc + 1;
+ *argvp = argv - 1;
+
+out:
+ free(srh);
+
+ return ret;
+}
+
struct lwt_x {
struct rtattr *rta;
size_t len;
@@ -1537,6 +1655,9 @@ int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp,
case LWTUNNEL_ENCAP_SEG6_LOCAL:
ret = parse_encap_seg6local(rta, len, &argc, &argv);
break;
+ case LWTUNNEL_ENCAP_RPL:
+ ret = parse_encap_rpl(rta, len, &argc, &argv);
+ break;
default:
fprintf(stderr, "Error: unsupported encap type\n");
break;
--
2.20.1
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