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ipv6: ioam: Add support for the ip6ip6 encapsulation
This patch adds support for the ip6ip6 encapsulation by providing three encap modes: inline, encap and auto. Signed-off-by: Justin Iurman <justin.iurman@uliege.be> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Justin Iurman
David S. Miller
parent
7b34e449e0
commit
8cb3bf8bff
@ -9,9 +9,38 @@
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#ifndef _UAPI_LINUX_IOAM6_IPTUNNEL_H
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#define _UAPI_LINUX_IOAM6_IPTUNNEL_H
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/* Encap modes:
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* - inline: direct insertion
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* - encap: ip6ip6 encapsulation
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* - auto: inline for local packets, encap for in-transit packets
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*/
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enum {
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__IOAM6_IPTUNNEL_MODE_MIN,
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IOAM6_IPTUNNEL_MODE_INLINE,
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IOAM6_IPTUNNEL_MODE_ENCAP,
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IOAM6_IPTUNNEL_MODE_AUTO,
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__IOAM6_IPTUNNEL_MODE_MAX,
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};
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#define IOAM6_IPTUNNEL_MODE_MIN (__IOAM6_IPTUNNEL_MODE_MIN + 1)
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#define IOAM6_IPTUNNEL_MODE_MAX (__IOAM6_IPTUNNEL_MODE_MAX - 1)
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enum {
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IOAM6_IPTUNNEL_UNSPEC,
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/* Encap mode */
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IOAM6_IPTUNNEL_MODE, /* u8 */
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/* Tunnel dst address.
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* For encap,auto modes.
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*/
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IOAM6_IPTUNNEL_DST, /* struct in6_addr */
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/* IOAM Trace Header */
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IOAM6_IPTUNNEL_TRACE, /* struct ioam6_trace_hdr */
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__IOAM6_IPTUNNEL_MAX,
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};
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@ -332,10 +332,10 @@ config IPV6_IOAM6_LWTUNNEL
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bool "IPv6: IOAM Pre-allocated Trace insertion support"
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depends on IPV6
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select LWTUNNEL
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select DST_CACHE
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help
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Support for the inline insertion of IOAM Pre-allocated
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Trace Header (only on locally generated packets), using
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the lightweight tunnels mechanism.
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Support for the insertion of IOAM Pre-allocated Trace
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Header using the lightweight tunnels mechanism.
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If unsure, say N.
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@ -17,6 +17,10 @@
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#include <net/lwtunnel.h>
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#include <net/ioam6.h>
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#include <net/netlink.h>
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#include <net/ipv6.h>
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#include <net/dst_cache.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#define IOAM6_MASK_SHORT_FIELDS 0xff100000
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#define IOAM6_MASK_WIDE_FIELDS 0xe00000
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@ -29,6 +33,9 @@ struct ioam6_lwt_encap {
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} __packed;
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struct ioam6_lwt {
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struct dst_cache cache;
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u8 mode;
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struct in6_addr tundst;
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struct ioam6_lwt_encap tuninfo;
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};
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@ -48,6 +55,10 @@ static struct ioam6_trace_hdr *ioam6_lwt_trace(struct lwtunnel_state *lwt)
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}
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static const struct nla_policy ioam6_iptunnel_policy[IOAM6_IPTUNNEL_MAX + 1] = {
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[IOAM6_IPTUNNEL_MODE] = NLA_POLICY_RANGE(NLA_U8,
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IOAM6_IPTUNNEL_MODE_MIN,
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IOAM6_IPTUNNEL_MODE_MAX),
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[IOAM6_IPTUNNEL_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
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[IOAM6_IPTUNNEL_TRACE] = NLA_POLICY_EXACT_LEN(sizeof(struct ioam6_trace_hdr)),
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};
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@ -78,9 +89,10 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
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struct nlattr *tb[IOAM6_IPTUNNEL_MAX + 1];
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struct ioam6_lwt_encap *tuninfo;
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struct ioam6_trace_hdr *trace;
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struct lwtunnel_state *s;
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int len_aligned;
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int len, err;
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struct lwtunnel_state *lwt;
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struct ioam6_lwt *ilwt;
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int len_aligned, err;
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u8 mode;
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if (family != AF_INET6)
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return -EINVAL;
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@ -90,6 +102,16 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
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if (err < 0)
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return err;
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if (!tb[IOAM6_IPTUNNEL_MODE])
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mode = IOAM6_IPTUNNEL_MODE_INLINE;
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else
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mode = nla_get_u8(tb[IOAM6_IPTUNNEL_MODE]);
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if (!tb[IOAM6_IPTUNNEL_DST] && mode != IOAM6_IPTUNNEL_MODE_INLINE) {
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NL_SET_ERR_MSG(extack, "this mode needs a tunnel destination");
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return -EINVAL;
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}
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if (!tb[IOAM6_IPTUNNEL_TRACE]) {
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NL_SET_ERR_MSG(extack, "missing trace");
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return -EINVAL;
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@ -102,15 +124,24 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
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return -EINVAL;
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}
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len = sizeof(*tuninfo) + trace->remlen * 4;
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len_aligned = ALIGN(len, 8);
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s = lwtunnel_state_alloc(len_aligned);
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if (!s)
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len_aligned = ALIGN(trace->remlen * 4, 8);
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lwt = lwtunnel_state_alloc(sizeof(*ilwt) + len_aligned);
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if (!lwt)
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return -ENOMEM;
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tuninfo = ioam6_lwt_info(s);
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tuninfo->eh.hdrlen = (len_aligned >> 3) - 1;
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ilwt = ioam6_lwt_state(lwt);
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err = dst_cache_init(&ilwt->cache, GFP_ATOMIC);
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if (err) {
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kfree(lwt);
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return err;
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}
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ilwt->mode = mode;
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if (tb[IOAM6_IPTUNNEL_DST])
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ilwt->tundst = nla_get_in6_addr(tb[IOAM6_IPTUNNEL_DST]);
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tuninfo = ioam6_lwt_info(lwt);
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tuninfo->eh.hdrlen = ((sizeof(*tuninfo) + len_aligned) >> 3) - 1;
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tuninfo->pad[0] = IPV6_TLV_PADN;
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tuninfo->ioamh.type = IOAM6_TYPE_PREALLOC;
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tuninfo->ioamh.opt_type = IPV6_TLV_IOAM;
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@ -119,27 +150,39 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
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memcpy(&tuninfo->traceh, trace, sizeof(*trace));
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len = len_aligned - len;
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if (len == 1) {
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tuninfo->traceh.data[trace->remlen * 4] = IPV6_TLV_PAD1;
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} else if (len > 0) {
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if (len_aligned - trace->remlen * 4) {
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tuninfo->traceh.data[trace->remlen * 4] = IPV6_TLV_PADN;
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tuninfo->traceh.data[trace->remlen * 4 + 1] = len - 2;
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tuninfo->traceh.data[trace->remlen * 4 + 1] = 2;
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}
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s->type = LWTUNNEL_ENCAP_IOAM6;
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s->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT;
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lwt->type = LWTUNNEL_ENCAP_IOAM6;
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lwt->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT;
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*ts = s;
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*ts = lwt;
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return 0;
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}
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static int ioam6_do_inline(struct sk_buff *skb, struct ioam6_lwt_encap *tuninfo)
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static int ioam6_do_fill(struct net *net, struct sk_buff *skb)
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{
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struct ioam6_trace_hdr *trace;
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struct ipv6hdr *oldhdr, *hdr;
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struct ioam6_namespace *ns;
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trace = (struct ioam6_trace_hdr *)(skb_transport_header(skb)
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+ sizeof(struct ipv6_hopopt_hdr) + 2
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+ sizeof(struct ioam6_hdr));
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ns = ioam6_namespace(net, trace->namespace_id);
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if (ns)
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ioam6_fill_trace_data(skb, ns, trace, false);
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return 0;
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}
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static int ioam6_do_inline(struct net *net, struct sk_buff *skb,
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struct ioam6_lwt_encap *tuninfo)
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{
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struct ipv6hdr *oldhdr, *hdr;
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int hdrlen, err;
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hdrlen = (tuninfo->eh.hdrlen + 1) << 3;
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@ -168,79 +211,195 @@ static int ioam6_do_inline(struct sk_buff *skb, struct ioam6_lwt_encap *tuninfo)
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hdr->nexthdr = NEXTHDR_HOP;
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hdr->payload_len = cpu_to_be16(skb->len - sizeof(*hdr));
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trace = (struct ioam6_trace_hdr *)(skb_transport_header(skb)
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+ sizeof(struct ipv6_hopopt_hdr) + 2
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+ sizeof(struct ioam6_hdr));
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return ioam6_do_fill(net, skb);
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}
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ns = ioam6_namespace(dev_net(skb_dst(skb)->dev), trace->namespace_id);
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if (ns)
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ioam6_fill_trace_data(skb, ns, trace);
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static int ioam6_do_encap(struct net *net, struct sk_buff *skb,
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struct ioam6_lwt_encap *tuninfo,
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struct in6_addr *tundst)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct ipv6hdr *hdr, *inner_hdr;
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int hdrlen, len, err;
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return 0;
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hdrlen = (tuninfo->eh.hdrlen + 1) << 3;
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len = sizeof(*hdr) + hdrlen;
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err = skb_cow_head(skb, len + skb->mac_len);
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if (unlikely(err))
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return err;
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inner_hdr = ipv6_hdr(skb);
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skb_push(skb, len);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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skb_set_transport_header(skb, sizeof(*hdr));
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tuninfo->eh.nexthdr = NEXTHDR_IPV6;
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memcpy(skb_transport_header(skb), (u8 *)tuninfo, hdrlen);
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hdr = ipv6_hdr(skb);
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memcpy(hdr, inner_hdr, sizeof(*hdr));
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hdr->nexthdr = NEXTHDR_HOP;
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hdr->payload_len = cpu_to_be16(skb->len - sizeof(*hdr));
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hdr->daddr = *tundst;
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ipv6_dev_get_saddr(net, dst->dev, &hdr->daddr,
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IPV6_PREFER_SRC_PUBLIC, &hdr->saddr);
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skb_postpush_rcsum(skb, hdr, len);
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return ioam6_do_fill(net, skb);
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}
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static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
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struct lwtunnel_state *lwt = skb_dst(skb)->lwtstate;
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struct dst_entry *dst = skb_dst(skb);
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struct in6_addr orig_daddr;
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struct ioam6_lwt *ilwt;
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int err = -EINVAL;
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if (skb->protocol != htons(ETH_P_IPV6))
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goto drop;
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/* Only for packets we send and
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* that do not contain a Hop-by-Hop yet
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*/
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if (skb->dev || ipv6_hdr(skb)->nexthdr == NEXTHDR_HOP)
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goto out;
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ilwt = ioam6_lwt_state(dst->lwtstate);
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orig_daddr = ipv6_hdr(skb)->daddr;
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err = ioam6_do_inline(skb, ioam6_lwt_info(lwt));
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switch (ilwt->mode) {
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case IOAM6_IPTUNNEL_MODE_INLINE:
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do_inline:
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/* Direct insertion - if there is no Hop-by-Hop yet */
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if (ipv6_hdr(skb)->nexthdr == NEXTHDR_HOP)
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goto out;
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err = ioam6_do_inline(net, skb, &ilwt->tuninfo);
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if (unlikely(err))
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goto drop;
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break;
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case IOAM6_IPTUNNEL_MODE_ENCAP:
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do_encap:
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/* Encapsulation (ip6ip6) */
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err = ioam6_do_encap(net, skb, &ilwt->tuninfo, &ilwt->tundst);
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if (unlikely(err))
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goto drop;
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break;
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case IOAM6_IPTUNNEL_MODE_AUTO:
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/* Automatic (RFC8200 compliant):
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* - local packets -> INLINE mode
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* - in-transit packets -> ENCAP mode
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*/
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if (!skb->dev)
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goto do_inline;
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goto do_encap;
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default:
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goto drop;
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}
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err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
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if (unlikely(err))
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goto drop;
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err = skb_cow_head(skb, LL_RESERVED_SPACE(skb_dst(skb)->dev));
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if (unlikely(err))
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goto drop;
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if (!ipv6_addr_equal(&orig_daddr, &ipv6_hdr(skb)->daddr)) {
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preempt_disable();
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dst = dst_cache_get(&ilwt->cache);
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preempt_enable();
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if (unlikely(!dst)) {
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struct ipv6hdr *hdr = ipv6_hdr(skb);
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struct flowi6 fl6;
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memset(&fl6, 0, sizeof(fl6));
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fl6.daddr = hdr->daddr;
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fl6.saddr = hdr->saddr;
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fl6.flowlabel = ip6_flowinfo(hdr);
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fl6.flowi6_mark = skb->mark;
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fl6.flowi6_proto = hdr->nexthdr;
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dst = ip6_route_output(net, NULL, &fl6);
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if (dst->error) {
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err = dst->error;
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dst_release(dst);
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goto drop;
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}
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preempt_disable();
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dst_cache_set_ip6(&ilwt->cache, dst, &fl6.saddr);
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preempt_enable();
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, dst);
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return dst_output(net, sk, skb);
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}
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out:
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return lwt->orig_output(net, sk, skb);
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return dst->lwtstate->orig_output(net, sk, skb);
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drop:
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kfree_skb(skb);
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return err;
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}
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static void ioam6_destroy_state(struct lwtunnel_state *lwt)
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{
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dst_cache_destroy(&ioam6_lwt_state(lwt)->cache);
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}
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static int ioam6_fill_encap_info(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate)
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{
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struct ioam6_trace_hdr *trace;
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struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
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int err;
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trace = ioam6_lwt_trace(lwtstate);
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err = nla_put(skb, IOAM6_IPTUNNEL_TRACE, sizeof(*trace), trace);
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err = nla_put_u8(skb, IOAM6_IPTUNNEL_MODE, ilwt->mode);
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if (err)
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return err;
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goto ret;
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return 0;
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if (ilwt->mode != IOAM6_IPTUNNEL_MODE_INLINE) {
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err = nla_put_in6_addr(skb, IOAM6_IPTUNNEL_DST, &ilwt->tundst);
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if (err)
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goto ret;
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}
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err = nla_put(skb, IOAM6_IPTUNNEL_TRACE, sizeof(ilwt->tuninfo.traceh),
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&ilwt->tuninfo.traceh);
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ret:
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return err;
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}
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static int ioam6_encap_nlsize(struct lwtunnel_state *lwtstate)
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{
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struct ioam6_trace_hdr *trace = ioam6_lwt_trace(lwtstate);
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struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
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int nlsize;
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return nla_total_size(sizeof(*trace));
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nlsize = nla_total_size(sizeof(ilwt->mode)) +
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nla_total_size(sizeof(ilwt->tuninfo.traceh));
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if (ilwt->mode != IOAM6_IPTUNNEL_MODE_INLINE)
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nlsize += nla_total_size(sizeof(ilwt->tundst));
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return nlsize;
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}
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static int ioam6_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
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{
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struct ioam6_trace_hdr *a_hdr = ioam6_lwt_trace(a);
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struct ioam6_trace_hdr *b_hdr = ioam6_lwt_trace(b);
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struct ioam6_trace_hdr *trace_a = ioam6_lwt_trace(a);
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struct ioam6_trace_hdr *trace_b = ioam6_lwt_trace(b);
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struct ioam6_lwt *ilwt_a = ioam6_lwt_state(a);
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struct ioam6_lwt *ilwt_b = ioam6_lwt_state(b);
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return (a_hdr->namespace_id != b_hdr->namespace_id);
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return (ilwt_a->mode != ilwt_b->mode ||
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(ilwt_a->mode != IOAM6_IPTUNNEL_MODE_INLINE &&
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!ipv6_addr_equal(&ilwt_a->tundst, &ilwt_b->tundst)) ||
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trace_a->namespace_id != trace_b->namespace_id);
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}
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static const struct lwtunnel_encap_ops ioam6_iptun_ops = {
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.build_state = ioam6_build_state,
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.destroy_state = ioam6_destroy_state,
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.output = ioam6_output,
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.fill_encap = ioam6_fill_encap_info,
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.get_encap_size = ioam6_encap_nlsize,
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