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Date: Tue, 10 Jan 2017 09:26:19 -0800
From: Tom Herbert <tom@...bertland.com>
To: David Lebrun <david.lebrun@...ouvain.be>
Cc: Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2 3/3] iproute: add support for SR-IPv6 lwtunnel encapsulation
On Tue, Jan 10, 2017 at 8:41 AM, David Lebrun <david.lebrun@...ouvain.be> wrote:
> 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 | 160 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 164 insertions(+), 2 deletions(-)
>
> diff --git a/ip/iproute.c b/ip/iproute.c
> index e433de8..a102e33 100644
> --- a/ip/iproute.c
> +++ b/ip/iproute.c
> @@ -98,8 +98,10 @@ 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 1a92cec..3ee6dcc 100644
> --- a/ip/iproute_lwtunnel.c
> +++ b/ip/iproute_lwtunnel.c
> @@ -26,6 +26,10 @@
> #include "iproute_lwtunnel.h"
> #include "bpf_util.h"
>
> +#include <linux/seg6.h>
> +#include <linux/seg6_iptunnel.h>
> +#include <linux/seg6_hmac.h>
> +
> static const char *format_encap_type(int type)
> {
> switch (type) {
> @@ -39,6 +43,8 @@ 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 +75,51 @@ 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_cleanup(srh))
> +
> + 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];
> @@ -238,9 +283,121 @@ 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, cleanup_ok = 0, hmac_ok = 0;
> + struct seg6_iptunnel_encap *tuninfo;
> + struct ipv6_sr_hdr *srh;
> + char **argv = *argvp;
> + char segbuf[1024];
> + int argc = *argcp;
> + __u8 cleanup = 0;
> + 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, "cleanup") == 0) {
> + if (cleanup_ok++)
> + duparg2("cleanup", *argv);
> + cleanup = 1;
> + } 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 (cleanup)
> + srh->flag_1 |= SR6_FLAG1_CLEANUP;
> + if (hmac)
> + srh->flag_1 |= 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,
> int *argcp, char ***argvp)
> {
> @@ -573,6 +730,9 @@ 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;
> --
> 2.7.3
>
Acked-by: Tom Herbert <tom@...bertland.com>
Is there a place do document all the SR functionality?
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