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authorDavid Lebrun <david.lebrun@uclouvain.be>2017-08-25 09:56:44 +0200
committerDavid S. Miller <davem@davemloft.net>2017-08-25 17:10:23 -0700
commit32d99d0b670299720dd0db92a974c9612c230889 (patch)
tree339777628429f48fdb84d2a0a913e5b898e78f01 /net
parent3fd87127073292538047adf1c9c757e9cab0dd56 (diff)
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ipv6: sr: add support for ip4ip6 encapsulation
This patch enables the SRv6 encapsulation mode to carry an IPv4 payload. All the infrastructure was already present, I just had to add a parameter to seg6_do_srh_encap() to specify the inner packet protocol, and perform some additional checks. Usage example: ip route add 1.2.3.4 encap seg6 mode encap segs fc00::1,fc00::2 dev eth0 Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/seg6_iptunnel.c47
-rw-r--r--net/ipv6/seg6_local.c2
2 files changed, 38 insertions, 11 deletions
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 501233040570..5bec7817a7b9 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -91,7 +91,7 @@ static void set_tun_src(struct net *net, struct net_device *dev,
}
/* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
-int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
+int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
{
struct net *net = dev_net(skb_dst(skb)->dev);
struct ipv6hdr *hdr, *inner_hdr;
@@ -116,15 +116,22 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
* hlim will be decremented in ip6_forward() afterwards and
* decapsulation will overwrite inner hlim with outer hlim
*/
- ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
- ip6_flowlabel(inner_hdr));
- hdr->hop_limit = inner_hdr->hop_limit;
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
+ ip6_flowlabel(inner_hdr));
+ hdr->hop_limit = inner_hdr->hop_limit;
+ } else {
+ ip6_flow_hdr(hdr, 0, 0);
+ hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
+ }
+
hdr->nexthdr = NEXTHDR_ROUTING;
isrh = (void *)hdr + sizeof(*hdr);
memcpy(isrh, osrh, hdrlen);
- isrh->nexthdr = NEXTHDR_IPV6;
+ isrh->nexthdr = proto;
hdr->daddr = isrh->segments[isrh->first_segment];
set_tun_src(net, skb->dev, &hdr->daddr, &hdr->saddr);
@@ -199,7 +206,7 @@ static int seg6_do_srh(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct seg6_iptunnel_encap *tinfo;
- int err = 0;
+ int proto, err = 0;
tinfo = seg6_encap_lwtunnel(dst->lwtstate);
@@ -210,17 +217,31 @@ static int seg6_do_srh(struct sk_buff *skb)
switch (tinfo->mode) {
case SEG6_IPTUN_MODE_INLINE:
+ if (skb->protocol != htons(ETH_P_IPV6))
+ return -EINVAL;
+
err = seg6_do_srh_inline(skb, tinfo->srh);
+ if (err)
+ return err;
+
skb_reset_inner_headers(skb);
break;
case SEG6_IPTUN_MODE_ENCAP:
- err = seg6_do_srh_encap(skb, tinfo->srh);
+ if (skb->protocol == htons(ETH_P_IPV6))
+ proto = IPPROTO_IPV6;
+ else if (skb->protocol == htons(ETH_P_IP))
+ proto = IPPROTO_IPIP;
+ else
+ return -EINVAL;
+
+ err = seg6_do_srh_encap(skb, tinfo->srh, proto);
+ if (err)
+ return err;
+
+ skb->protocol = htons(ETH_P_IPV6);
break;
}
- if (err)
- return err;
-
ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
@@ -334,6 +355,9 @@ static int seg6_build_state(struct nlattr *nla,
struct seg6_lwt *slwt;
int err;
+ if (family != AF_INET && family != AF_INET6)
+ return -EINVAL;
+
err = nla_parse_nested(tb, SEG6_IPTUNNEL_MAX, nla,
seg6_iptunnel_policy, extack);
@@ -356,6 +380,9 @@ static int seg6_build_state(struct nlattr *nla,
switch (tuninfo->mode) {
case SEG6_IPTUN_MODE_INLINE:
+ if (family != AF_INET6)
+ return -EINVAL;
+
break;
case SEG6_IPTUN_MODE_ENCAP:
break;
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 147680e7a00c..609b94e970de 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -290,7 +290,7 @@ static int input_action_end_b6_encap(struct sk_buff *skb,
skb_reset_inner_headers(skb);
skb->encapsulation = 1;
- err = seg6_do_srh_encap(skb, slwt->srh);
+ err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
if (err)
goto drop;