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Message-ID: <20170415101717.18730-3-david.lebrun@uclouvain.be>
Date: Sat, 15 Apr 2017 12:17:16 +0200
From: David Lebrun <david.lebrun@...ouvain.be>
To: <netdev@...r.kernel.org>
CC: David Lebrun <david.lebrun@...ouvain.be>
Subject: [PATCH iproute2 net-next v2 2/3] iproute: add support for SR-IPv6 lwtunnel encapsulation
This patch adds support for SEG6 encapsulation type
("ip route add ... encap seg6 ...").
Signed-off-by: David Lebrun <david.lebrun@...ouvain.be>
---
ip/iproute.c | 6 +-
ip/iproute_lwtunnel.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 158 insertions(+), 2 deletions(-)
diff --git a/ip/iproute.c b/ip/iproute.c
index eedcc2f..b4ca291 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -99,8 +99,10 @@ 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");
+ fprintf(stderr, "ENCAPTYPE := [ mpls | ip | ip6 | seg6 ]\n");
+ fprintf(stderr, "ENCAPHDR := [ MPLSLABEL | SEG6HDR ]\n");
+ fprintf(stderr, "SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n");
+ fprintf(stderr, "SEGMODE := [ encap | inline ]\n");
exit(-1);
}
diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 845a115..1395f03 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -19,6 +19,13 @@
#include <linux/ila.h>
#include <linux/lwtunnel.h>
#include <linux/mpls_iptunnel.h>
+
+#ifndef __USE_KERNEL_IPV6_DEFS
+#define __USE_KERNEL_IPV6_DEFS
+#endif
+#include <linux/seg6.h>
+#include <linux/seg6_iptunnel.h>
+#include <linux/seg6_hmac.h>
#include <errno.h>
#include "rt_names.h"
@@ -39,6 +46,8 @@ static const char *format_encap_type(int type)
return "ila";
case LWTUNNEL_ENCAP_BPF:
return "bpf";
+ case LWTUNNEL_ENCAP_SEG6:
+ return "seg6";
default:
return "unknown";
}
@@ -69,12 +78,49 @@ static int read_encap_type(const char *name)
return LWTUNNEL_ENCAP_ILA;
else if (strcmp(name, "bpf") == 0)
return LWTUNNEL_ENCAP_BPF;
+ else if (strcmp(name, "seg6") == 0)
+ return LWTUNNEL_ENCAP_SEG6;
else if (strcmp(name, "help") == 0)
encap_type_usage();
return LWTUNNEL_ENCAP_NONE;
}
+static void print_encap_seg6(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[SEG6_IPTUNNEL_MAX+1];
+ struct seg6_iptunnel_encap *tuninfo;
+ struct ipv6_sr_hdr *srh;
+ int i;
+
+ parse_rtattr_nested(tb, SEG6_IPTUNNEL_MAX, encap);
+
+ if (!tb[SEG6_IPTUNNEL_SRH])
+ return;
+
+ tuninfo = RTA_DATA(tb[SEG6_IPTUNNEL_SRH]);
+ fprintf(fp, "mode %s ",
+ (tuninfo->mode == SEG6_IPTUN_MODE_ENCAP) ? "encap" : "inline");
+
+ srh = tuninfo->srh;
+
+ fprintf(fp, "segs %d [ ", srh->first_segment + 1);
+
+ for (i = srh->first_segment; i >= 0; i--)
+ fprintf(fp, "%s ",
+ rt_addr_n2a(AF_INET6, 16, &srh->segments[i]));
+
+ fprintf(fp, "] ");
+
+ if (sr_has_hmac(srh)) {
+ unsigned int offset = ((srh->hdrlen + 1) << 3) - 40;
+ struct sr6_tlv_hmac *tlv;
+
+ tlv = (struct sr6_tlv_hmac *)((char *)srh + offset);
+ fprintf(fp, "hmac 0x%X ", ntohl(tlv->hmackeyid));
+ }
+}
+
static void print_encap_mpls(FILE *fp, struct rtattr *encap)
{
struct rtattr *tb[MPLS_IPTUNNEL_MAX+1];
@@ -241,7 +287,112 @@ void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
case LWTUNNEL_ENCAP_BPF:
print_encap_bpf(fp, encap);
break;
+ case LWTUNNEL_ENCAP_SEG6:
+ print_encap_seg6(fp, encap);
+ break;
+ }
+}
+
+static int parse_encap_seg6(struct rtattr *rta, size_t len, int *argcp,
+ char ***argvp)
+{
+ int mode_ok = 0, segs_ok = 0, hmac_ok = 0;
+ struct seg6_iptunnel_encap *tuninfo;
+ struct ipv6_sr_hdr *srh;
+ char **argv = *argvp;
+ char segbuf[1024];
+ int argc = *argcp;
+ int encap = -1;
+ __u32 hmac = 0;
+ int nsegs = 0;
+ int srhlen;
+ char *s;
+ int i;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "mode") == 0) {
+ NEXT_ARG();
+ if (mode_ok++)
+ duparg2("mode", *argv);
+ if (strcmp(*argv, "encap") == 0)
+ encap = 1;
+ else if (strcmp(*argv, "inline") == 0)
+ encap = 0;
+ else
+ invarg("\"mode\" value is invalid\n", *argv);
+ } else if (strcmp(*argv, "segs") == 0) {
+ NEXT_ARG();
+ if (segs_ok++)
+ duparg2("segs", *argv);
+ if (encap == -1)
+ invarg("\"segs\" provided before \"mode\"\n",
+ *argv);
+
+ strncpy(segbuf, *argv, 1024);
+ segbuf[1023] = 0;
+ } else if (strcmp(*argv, "hmac") == 0) {
+ NEXT_ARG();
+ if (hmac_ok++)
+ duparg2("hmac", *argv);
+ get_u32(&hmac, *argv, 0);
+ } else {
+ break;
+ }
+ argc--; argv++;
+ }
+
+ s = segbuf;
+ for (i = 0; *s; *s++ == ',' ? i++ : *s);
+ nsegs = i + 1;
+
+ if (!encap)
+ nsegs++;
+
+ srhlen = 8 + 16*nsegs;
+
+ if (hmac)
+ srhlen += 40;
+
+ tuninfo = malloc(sizeof(*tuninfo) + srhlen);
+ memset(tuninfo, 0, sizeof(*tuninfo) + srhlen);
+
+ if (encap)
+ tuninfo->mode = SEG6_IPTUN_MODE_ENCAP;
+ else
+ tuninfo->mode = SEG6_IPTUN_MODE_INLINE;
+
+ srh = tuninfo->srh;
+ srh->hdrlen = (srhlen >> 3) - 1;
+ srh->type = 4;
+ srh->segments_left = nsegs - 1;
+ srh->first_segment = nsegs - 1;
+
+ if (hmac)
+ srh->flags |= SR6_FLAG1_HMAC;
+
+ i = srh->first_segment;
+ for (s = strtok(segbuf, ","); s; s = strtok(NULL, ",")) {
+ inet_get_addr(s, NULL, &srh->segments[i]);
+ i--;
+ }
+
+ if (hmac) {
+ struct sr6_tlv_hmac *tlv;
+
+ tlv = (struct sr6_tlv_hmac *)((char *)srh + srhlen - 40);
+ tlv->tlvhdr.type = SR6_TLV_HMAC;
+ tlv->tlvhdr.len = 38;
+ tlv->hmackeyid = htonl(hmac);
}
+
+ rta_addattr_l(rta, len, SEG6_IPTUNNEL_SRH, tuninfo,
+ sizeof(*tuninfo) + srhlen);
+ free(tuninfo);
+
+ *argcp = argc + 1;
+ *argvp = argv - 1;
+
+ return 0;
}
static int parse_encap_mpls(struct rtattr *rta, size_t len,
@@ -600,6 +751,9 @@ int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
if (parse_encap_bpf(rta, len, &argc, &argv) < 0)
exit(-1);
break;
+ case LWTUNNEL_ENCAP_SEG6:
+ parse_encap_seg6(rta, len, &argc, &argv);
+ break;
default:
fprintf(stderr, "Error: unsupported encap type\n");
break;
--
2.10.2
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