#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
+#include <linux/mpls.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/pkt_cls.h>
static const int cfg_port = 8000;
static const int cfg_udp_src = 20000;
-static const int cfg_udp_dst = 5555;
+
+#define UDP_PORT 5555
+#define MPLS_OVER_UDP_PORT 6635
+#define ETH_OVER_UDP_PORT 7777
+
+/* MPLS label 1000 with S bit (last label) set and ttl of 255. */
+static const __u32 mpls_label = __bpf_constant_htonl(1000 << 12 |
+ MPLS_LS_S_MASK | 0xff);
struct gre_hdr {
__be16 flags;
struct v4hdr {
struct iphdr ip;
union l4hdr l4hdr;
+ __u8 pad[16]; /* enough space for L2 header */
} __attribute__((packed));
struct v6hdr {
struct ipv6hdr ip;
union l4hdr l4hdr;
+ __u8 pad[16]; /* enough space for L2 header */
} __attribute__((packed));
static __always_inline void set_ipv4_csum(struct iphdr *iph)
iph->check = ~((csum & 0xffff) + (csum >> 16));
}
-static __always_inline int encap_ipv4(struct __sk_buff *skb, __u8 encap_proto)
+static __always_inline int encap_ipv4(struct __sk_buff *skb, __u8 encap_proto,
+ __u16 l2_proto)
{
+ __u16 udp_dst = UDP_PORT;
struct iphdr iph_inner;
struct v4hdr h_outer;
struct tcphdr tcph;
+ int olen, l2_len;
__u64 flags;
- int olen;
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
sizeof(iph_inner)) < 0)
return TC_ACT_OK;
olen = sizeof(h_outer.ip);
+ l2_len = 0;
flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV4;
+
+ switch (l2_proto) {
+ case ETH_P_MPLS_UC:
+ l2_len = sizeof(mpls_label);
+ udp_dst = MPLS_OVER_UDP_PORT;
+ break;
+ case ETH_P_TEB:
+ l2_len = ETH_HLEN;
+ udp_dst = ETH_OVER_UDP_PORT;
+ break;
+ }
+ flags |= BPF_F_ADJ_ROOM_ENCAP_L2(l2_len);
+
switch (encap_proto) {
case IPPROTO_GRE:
flags |= BPF_F_ADJ_ROOM_ENCAP_L4_GRE;
olen += sizeof(h_outer.l4hdr.gre);
- h_outer.l4hdr.gre.protocol = bpf_htons(ETH_P_IP);
+ h_outer.l4hdr.gre.protocol = bpf_htons(l2_proto);
h_outer.l4hdr.gre.flags = 0;
break;
case IPPROTO_UDP:
flags |= BPF_F_ADJ_ROOM_ENCAP_L4_UDP;
olen += sizeof(h_outer.l4hdr.udp);
h_outer.l4hdr.udp.source = __bpf_constant_htons(cfg_udp_src);
- h_outer.l4hdr.udp.dest = __bpf_constant_htons(cfg_udp_dst);
+ h_outer.l4hdr.udp.dest = bpf_htons(udp_dst);
h_outer.l4hdr.udp.check = 0;
h_outer.l4hdr.udp.len = bpf_htons(bpf_ntohs(iph_inner.tot_len) +
- sizeof(h_outer.l4hdr.udp));
+ sizeof(h_outer.l4hdr.udp) +
+ l2_len);
break;
case IPPROTO_IPIP:
break;
return TC_ACT_OK;
}
+ /* add L2 encap (if specified) */
+ switch (l2_proto) {
+ case ETH_P_MPLS_UC:
+ *((__u32 *)((__u8 *)&h_outer + olen)) = mpls_label;
+ break;
+ case ETH_P_TEB:
+ if (bpf_skb_load_bytes(skb, 0, (__u8 *)&h_outer + olen,
+ ETH_HLEN))
+ return TC_ACT_SHOT;
+ break;
+ }
+ olen += l2_len;
+
/* add room between mac and network header */
if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
return TC_ACT_SHOT;
return TC_ACT_OK;
}
-static __always_inline int encap_ipv6(struct __sk_buff *skb, __u8 encap_proto)
+static __always_inline int encap_ipv6(struct __sk_buff *skb, __u8 encap_proto,
+ __u16 l2_proto)
{
+ __u16 udp_dst = UDP_PORT;
struct ipv6hdr iph_inner;
struct v6hdr h_outer;
struct tcphdr tcph;
+ int olen, l2_len;
__u16 tot_len;
__u64 flags;
- int olen;
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
sizeof(iph_inner)) < 0)
return TC_ACT_OK;
olen = sizeof(h_outer.ip);
+ l2_len = 0;
flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV6;
+
+ switch (l2_proto) {
+ case ETH_P_MPLS_UC:
+ l2_len = sizeof(mpls_label);
+ udp_dst = MPLS_OVER_UDP_PORT;
+ break;
+ case ETH_P_TEB:
+ l2_len = ETH_HLEN;
+ udp_dst = ETH_OVER_UDP_PORT;
+ break;
+ }
+ flags |= BPF_F_ADJ_ROOM_ENCAP_L2(l2_len);
+
switch (encap_proto) {
case IPPROTO_GRE:
flags |= BPF_F_ADJ_ROOM_ENCAP_L4_GRE;
olen += sizeof(h_outer.l4hdr.gre);
- h_outer.l4hdr.gre.protocol = bpf_htons(ETH_P_IPV6);
+ h_outer.l4hdr.gre.protocol = bpf_htons(l2_proto);
h_outer.l4hdr.gre.flags = 0;
break;
case IPPROTO_UDP:
flags |= BPF_F_ADJ_ROOM_ENCAP_L4_UDP;
olen += sizeof(h_outer.l4hdr.udp);
h_outer.l4hdr.udp.source = __bpf_constant_htons(cfg_udp_src);
- h_outer.l4hdr.udp.dest = __bpf_constant_htons(cfg_udp_dst);
+ h_outer.l4hdr.udp.dest = bpf_htons(udp_dst);
tot_len = bpf_ntohs(iph_inner.payload_len) + sizeof(iph_inner) +
sizeof(h_outer.l4hdr.udp);
h_outer.l4hdr.udp.check = 0;
return TC_ACT_OK;
}
+ /* add L2 encap (if specified) */
+ switch (l2_proto) {
+ case ETH_P_MPLS_UC:
+ *((__u32 *)((__u8 *)&h_outer + olen)) = mpls_label;
+ break;
+ case ETH_P_TEB:
+ if (bpf_skb_load_bytes(skb, 0, (__u8 *)&h_outer + olen,
+ ETH_HLEN))
+ return TC_ACT_SHOT;
+ break;
+ }
+ olen += l2_len;
+
/* add room between mac and network header */
if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
return TC_ACT_SHOT;
return TC_ACT_OK;
}
-SEC("encap_ipip")
-int __encap_ipip(struct __sk_buff *skb)
+SEC("encap_ipip_none")
+int __encap_ipip_none(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
+ return encap_ipv4(skb, IPPROTO_IPIP, ETH_P_IP);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_gre_none")
+int __encap_gre_none(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
+ return encap_ipv4(skb, IPPROTO_GRE, ETH_P_IP);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_gre_mpls")
+int __encap_gre_mpls(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
+ return encap_ipv4(skb, IPPROTO_GRE, ETH_P_MPLS_UC);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_gre_eth")
+int __encap_gre_eth(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
- return encap_ipv4(skb, IPPROTO_IPIP);
+ return encap_ipv4(skb, IPPROTO_GRE, ETH_P_TEB);
else
return TC_ACT_OK;
}
-SEC("encap_gre")
-int __encap_gre(struct __sk_buff *skb)
+SEC("encap_udp_none")
+int __encap_udp_none(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
- return encap_ipv4(skb, IPPROTO_GRE);
+ return encap_ipv4(skb, IPPROTO_UDP, ETH_P_IP);
else
return TC_ACT_OK;
}
-SEC("encap_udp")
-int __encap_udp(struct __sk_buff *skb)
+SEC("encap_udp_mpls")
+int __encap_udp_mpls(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
- return encap_ipv4(skb, IPPROTO_UDP);
+ return encap_ipv4(skb, IPPROTO_UDP, ETH_P_MPLS_UC);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_udp_eth")
+int __encap_udp_eth(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
+ return encap_ipv4(skb, IPPROTO_UDP, ETH_P_TEB);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_ip6tnl_none")
+int __encap_ip6tnl_none(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
+ return encap_ipv6(skb, IPPROTO_IPV6, ETH_P_IPV6);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_ip6gre_none")
+int __encap_ip6gre_none(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
+ return encap_ipv6(skb, IPPROTO_GRE, ETH_P_IPV6);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_ip6gre_mpls")
+int __encap_ip6gre_mpls(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
+ return encap_ipv6(skb, IPPROTO_GRE, ETH_P_MPLS_UC);
+ else
+ return TC_ACT_OK;
+}
+
+SEC("encap_ip6gre_eth")
+int __encap_ip6gre_eth(struct __sk_buff *skb)
+{
+ if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
+ return encap_ipv6(skb, IPPROTO_GRE, ETH_P_TEB);
else
return TC_ACT_OK;
}
-SEC("encap_ip6tnl")
-int __encap_ip6tnl(struct __sk_buff *skb)
+SEC("encap_ip6udp_none")
+int __encap_ip6udp_none(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
- return encap_ipv6(skb, IPPROTO_IPV6);
+ return encap_ipv6(skb, IPPROTO_UDP, ETH_P_IPV6);
else
return TC_ACT_OK;
}
-SEC("encap_ip6gre")
-int __encap_ip6gre(struct __sk_buff *skb)
+SEC("encap_ip6udp_mpls")
+int __encap_ip6udp_mpls(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
- return encap_ipv6(skb, IPPROTO_GRE);
+ return encap_ipv6(skb, IPPROTO_UDP, ETH_P_MPLS_UC);
else
return TC_ACT_OK;
}
-SEC("encap_ip6udp")
-int __encap_ip6udp(struct __sk_buff *skb)
+SEC("encap_ip6udp_eth")
+int __encap_ip6udp_eth(struct __sk_buff *skb)
{
if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
- return encap_ipv6(skb, IPPROTO_UDP);
+ return encap_ipv6(skb, IPPROTO_UDP, ETH_P_TEB);
else
return TC_ACT_OK;
}
static int decap_internal(struct __sk_buff *skb, int off, int len, char proto)
{
char buf[sizeof(struct v6hdr)];
+ struct gre_hdr greh;
+ struct udphdr udph;
int olen = len;
switch (proto) {
break;
case IPPROTO_GRE:
olen += sizeof(struct gre_hdr);
+ if (bpf_skb_load_bytes(skb, off + len, &greh, sizeof(greh)) < 0)
+ return TC_ACT_OK;
+ switch (bpf_ntohs(greh.protocol)) {
+ case ETH_P_MPLS_UC:
+ olen += sizeof(mpls_label);
+ break;
+ case ETH_P_TEB:
+ olen += ETH_HLEN;
+ break;
+ }
break;
case IPPROTO_UDP:
olen += sizeof(struct udphdr);
+ if (bpf_skb_load_bytes(skb, off + len, &udph, sizeof(udph)) < 0)
+ return TC_ACT_OK;
+ switch (bpf_ntohs(udph.dest)) {
+ case MPLS_OVER_UDP_PORT:
+ olen += sizeof(mpls_label);
+ break;
+ case ETH_OVER_UDP_PORT:
+ olen += ETH_HLEN;
+ break;
+ }
break;
default:
return TC_ACT_OK;
# Must match port used by bpf program
readonly udpport=5555
+# MPLSoverUDP
+readonly mplsudpport=6635
+readonly mplsproto=137
readonly infile="$(mktemp)"
readonly outfile="$(mktemp)"
# clamp route to reserve room for tunnel headers
ip -netns "${ns1}" -4 route flush table main
ip -netns "${ns1}" -6 route flush table main
- ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1472 dev veth1
- ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1452 dev veth1
+ ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1458 dev veth1
+ ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1438 dev veth1
sleep 1
# no arguments: automated test, run all
if [[ "$#" -eq "0" ]]; then
echo "ipip"
- $0 ipv4 ipip 100
+ $0 ipv4 ipip none 100
echo "ip6ip6"
- $0 ipv6 ip6tnl 100
+ $0 ipv6 ip6tnl none 100
- echo "ip gre"
- $0 ipv4 gre 100
+ for mac in none mpls eth ; do
+ echo "ip gre $mac"
+ $0 ipv4 gre $mac 100
- echo "ip6 gre"
- $0 ipv6 ip6gre 100
+ echo "ip6 gre $mac"
+ $0 ipv6 ip6gre $mac 100
- echo "ip gre gso"
- $0 ipv4 gre 2000
+ echo "ip gre $mac gso"
+ $0 ipv4 gre $mac 2000
- echo "ip6 gre gso"
- $0 ipv6 ip6gre 2000
+ echo "ip6 gre $mac gso"
+ $0 ipv6 ip6gre $mac 2000
- echo "ip udp"
- $0 ipv4 udp 100
+ echo "ip udp $mac"
+ $0 ipv4 udp $mac 100
- echo "ip6 udp"
- $0 ipv6 ip6udp 100
+ echo "ip6 udp $mac"
+ $0 ipv6 ip6udp $mac 100
- echo "ip udp gso"
- $0 ipv4 udp 2000
+ echo "ip udp $mac gso"
+ $0 ipv4 udp $mac 2000
- echo "ip6 udp gso"
- $0 ipv6 ip6udp 2000
+ echo "ip6 udp $mac gso"
+ $0 ipv6 ip6udp $mac 2000
+ done
echo "OK. All tests passed"
exit 0
fi
-if [[ "$#" -ne "3" ]]; then
+if [[ "$#" -ne "4" ]]; then
echo "Usage: $0"
- echo " or: $0 <ipv4|ipv6> <tuntype> <data_len>"
+ echo " or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
exit 1
fi
readonly foumod=fou
readonly foutype=ipip
readonly fouproto=4
+ readonly fouproto_mpls=${mplsproto}
+ readonly gretaptype=gretap
;;
"ipv6")
readonly addr1="${ns1_v6}"
readonly foumod=fou6
readonly foutype=ip6tnl
readonly fouproto="41 -6"
+ readonly fouproto_mpls="${mplsproto} -6"
+ readonly gretaptype=ip6gretap
;;
*)
echo "unknown arg: $1"
esac
readonly tuntype=$2
-readonly datalen=$3
+readonly mac=$3
+readonly datalen=$4
-echo "encap ${addr1} to ${addr2}, type ${tuntype}, len ${datalen}"
+echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
trap cleanup EXIT
ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
ip netns exec "${ns1}" tc filter add dev veth1 egress \
bpf direct-action object-file ./test_tc_tunnel.o \
- section "encap_${tuntype}"
+ section "encap_${tuntype}_${mac}"
echo "test bpf encap without decap (expect failure)"
server_listen
! client_connect
targs="encap fou encap-sport auto encap-dport $udpport"
# fou may be a module; allow this to fail.
modprobe "${foumod}" ||true
- ip netns exec "${ns2}" ip fou add port 5555 ipproto ${fouproto}
+ if [[ "$mac" == "mpls" ]]; then
+ dport=${mplsudpport}
+ dproto=${fouproto_mpls}
+ tmode="mode any ttl 255"
+ else
+ dport=${udpport}
+ dproto=${fouproto}
+ fi
+ ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
+ targs="encap fou encap-sport auto encap-dport $dport"
+elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
+ ttype=$gretaptype
else
ttype=$tuntype
targs=""
# server is still running
# client can connect again
ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
- remote "${addr1}" local "${addr2}" $targs
+ ${tmode} remote "${addr1}" local "${addr2}" $targs
+
+expect_tun_fail=0
+
+if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
+ # No support for MPLS IPv6 fou tunnel; expect failure.
+ expect_tun_fail=1
+elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
+ # No support for TEB fou tunnel; expect failure.
+ expect_tun_fail=1
+elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
+ # Share ethernet address between tunnel/veth2 so L2 decap works.
+ ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
+ awk '/ether/ { print $2 }')
+ ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
+elif [[ "$mac" == "mpls" ]]; then
+ modprobe mpls_iptunnel ||true
+ modprobe mpls_gso ||true
+ ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
+ ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
+ ip netns exec "${ns2}" ip link set lo up
+ ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
+ ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
+fi
+
# Because packets are decapped by the tunnel they arrive on testtun0 from
# the IP stack perspective. Ensure reverse path filtering is disabled
# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
# selected as the max of the "all" and device-specific values.
ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
ip netns exec "${ns2}" ip link set dev testtun0 up
-echo "test bpf encap with tunnel device decap"
-client_connect
-verify_data
+if [[ "$expect_tun_fail" == 1 ]]; then
+ # This tunnel mode is not supported, so we expect failure.
+ echo "test bpf encap with tunnel device decap (expect failure)"
+ ! client_connect
+else
+ echo "test bpf encap with tunnel device decap"
+ client_connect
+ verify_data
+ server_listen
+fi
# serverside, use BPF for decap
ip netns exec "${ns2}" ip link del dev testtun0
ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
ip netns exec "${ns2}" tc filter add dev veth2 ingress \
bpf direct-action object-file ./test_tc_tunnel.o section decap
-server_listen
echo "test bpf encap with bpf decap"
client_connect
verify_data
projects / platform / kernel / linux-starfive.git / commitdiff