forked from mirrors/linux
selftests_bpf: extend test_tc_tunnel for UDP encap
commit 868d523535 ("bpf: add bpf_skb_adjust_room encap flags")
introduced support to bpf_skb_adjust_room for GSO-friendly GRE
and UDP encapsulation and later introduced associated test_tc_tunnel
tests. Here those tests are extended to cover UDP encapsulation also.
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alan Maguire
Daniel Borkmann
parent
c695865c5c
commit
166b5a7f2c
3 changed files with 145 additions and 50 deletions
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@ -25,3 +25,7 @@ CONFIG_XDP_SOCKETS=y
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CONFIG_FTRACE_SYSCALLS=y
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CONFIG_IPV6_TUNNEL=y
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CONFIG_IPV6_GRE=y
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CONFIG_NET_FOU=m
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CONFIG_NET_FOU_IP_TUNNELS=y
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CONFIG_IPV6_FOU=m
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CONFIG_IPV6_FOU_TUNNEL=m
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@ -12,6 +12,7 @@
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/pkt_cls.h>
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#include <linux/types.h>
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@ -20,16 +21,27 @@
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static const int cfg_port = 8000;
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struct grev4hdr {
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struct iphdr ip;
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static const int cfg_udp_src = 20000;
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static const int cfg_udp_dst = 5555;
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struct gre_hdr {
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__be16 flags;
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__be16 protocol;
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} __attribute__((packed));
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struct grev6hdr {
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union l4hdr {
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struct udphdr udp;
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struct gre_hdr gre;
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};
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struct v4hdr {
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struct iphdr ip;
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union l4hdr l4hdr;
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} __attribute__((packed));
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struct v6hdr {
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struct ipv6hdr ip;
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__be16 flags;
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__be16 protocol;
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union l4hdr l4hdr;
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} __attribute__((packed));
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static __always_inline void set_ipv4_csum(struct iphdr *iph)
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@ -47,10 +59,10 @@ static __always_inline void set_ipv4_csum(struct iphdr *iph)
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iph->check = ~((csum & 0xffff) + (csum >> 16));
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}
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static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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static __always_inline int encap_ipv4(struct __sk_buff *skb, __u8 encap_proto)
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{
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struct grev4hdr h_outer;
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struct iphdr iph_inner;
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struct v4hdr h_outer;
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struct tcphdr tcph;
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__u64 flags;
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int olen;
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@ -70,12 +82,29 @@ static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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if (tcph.dest != __bpf_constant_htons(cfg_port))
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return TC_ACT_OK;
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olen = sizeof(h_outer.ip);
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flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV4;
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if (with_gre) {
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switch (encap_proto) {
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case IPPROTO_GRE:
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flags |= BPF_F_ADJ_ROOM_ENCAP_L4_GRE;
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olen = sizeof(h_outer);
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} else {
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olen = sizeof(h_outer.ip);
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olen += sizeof(h_outer.l4hdr.gre);
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h_outer.l4hdr.gre.protocol = bpf_htons(ETH_P_IP);
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h_outer.l4hdr.gre.flags = 0;
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break;
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case IPPROTO_UDP:
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flags |= BPF_F_ADJ_ROOM_ENCAP_L4_UDP;
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olen += sizeof(h_outer.l4hdr.udp);
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h_outer.l4hdr.udp.source = __bpf_constant_htons(cfg_udp_src);
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h_outer.l4hdr.udp.dest = __bpf_constant_htons(cfg_udp_dst);
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h_outer.l4hdr.udp.check = 0;
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h_outer.l4hdr.udp.len = bpf_htons(bpf_ntohs(iph_inner.tot_len) +
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sizeof(h_outer.l4hdr.udp));
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break;
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case IPPROTO_IPIP:
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break;
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default:
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return TC_ACT_OK;
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}
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/* add room between mac and network header */
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@ -85,16 +114,10 @@ static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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/* prepare new outer network header */
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h_outer.ip = iph_inner;
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h_outer.ip.tot_len = bpf_htons(olen +
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bpf_htons(h_outer.ip.tot_len));
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if (with_gre) {
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h_outer.ip.protocol = IPPROTO_GRE;
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h_outer.protocol = bpf_htons(ETH_P_IP);
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h_outer.flags = 0;
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} else {
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h_outer.ip.protocol = IPPROTO_IPIP;
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}
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bpf_ntohs(h_outer.ip.tot_len));
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h_outer.ip.protocol = encap_proto;
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set_ipv4_csum((void *)&h_outer.ip);
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set_ipv4_csum(&h_outer.ip);
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/* store new outer network header */
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if (bpf_skb_store_bytes(skb, ETH_HLEN, &h_outer, olen,
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@ -104,11 +127,12 @@ static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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return TC_ACT_OK;
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}
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static __always_inline int encap_ipv6(struct __sk_buff *skb, bool with_gre)
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static __always_inline int encap_ipv6(struct __sk_buff *skb, __u8 encap_proto)
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{
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struct ipv6hdr iph_inner;
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struct grev6hdr h_outer;
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struct v6hdr h_outer;
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struct tcphdr tcph;
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__u16 tot_len;
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__u64 flags;
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int olen;
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@ -124,14 +148,31 @@ static __always_inline int encap_ipv6(struct __sk_buff *skb, bool with_gre)
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if (tcph.dest != __bpf_constant_htons(cfg_port))
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return TC_ACT_OK;
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flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV6;
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if (with_gre) {
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flags |= BPF_F_ADJ_ROOM_ENCAP_L4_GRE;
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olen = sizeof(h_outer);
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} else {
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olen = sizeof(h_outer.ip);
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}
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olen = sizeof(h_outer.ip);
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flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV6;
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switch (encap_proto) {
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case IPPROTO_GRE:
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flags |= BPF_F_ADJ_ROOM_ENCAP_L4_GRE;
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olen += sizeof(h_outer.l4hdr.gre);
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h_outer.l4hdr.gre.protocol = bpf_htons(ETH_P_IPV6);
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h_outer.l4hdr.gre.flags = 0;
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break;
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case IPPROTO_UDP:
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flags |= BPF_F_ADJ_ROOM_ENCAP_L4_UDP;
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olen += sizeof(h_outer.l4hdr.udp);
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h_outer.l4hdr.udp.source = __bpf_constant_htons(cfg_udp_src);
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h_outer.l4hdr.udp.dest = __bpf_constant_htons(cfg_udp_dst);
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tot_len = bpf_ntohs(iph_inner.payload_len) + sizeof(iph_inner) +
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sizeof(h_outer.l4hdr.udp);
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h_outer.l4hdr.udp.check = 0;
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h_outer.l4hdr.udp.len = bpf_htons(tot_len);
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break;
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case IPPROTO_IPV6:
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break;
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default:
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return TC_ACT_OK;
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}
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/* add room between mac and network header */
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if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
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@ -141,13 +182,8 @@ static __always_inline int encap_ipv6(struct __sk_buff *skb, bool with_gre)
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h_outer.ip = iph_inner;
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h_outer.ip.payload_len = bpf_htons(olen +
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bpf_ntohs(h_outer.ip.payload_len));
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if (with_gre) {
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h_outer.ip.nexthdr = IPPROTO_GRE;
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h_outer.protocol = bpf_htons(ETH_P_IPV6);
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h_outer.flags = 0;
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} else {
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h_outer.ip.nexthdr = IPPROTO_IPV6;
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}
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h_outer.ip.nexthdr = encap_proto;
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/* store new outer network header */
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if (bpf_skb_store_bytes(skb, ETH_HLEN, &h_outer, olen,
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@ -161,7 +197,7 @@ SEC("encap_ipip")
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int __encap_ipip(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
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return encap_ipv4(skb, false);
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return encap_ipv4(skb, IPPROTO_IPIP);
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else
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return TC_ACT_OK;
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}
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@ -170,7 +206,16 @@ SEC("encap_gre")
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int __encap_gre(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
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return encap_ipv4(skb, true);
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return encap_ipv4(skb, IPPROTO_GRE);
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else
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return TC_ACT_OK;
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}
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SEC("encap_udp")
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int __encap_udp(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
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return encap_ipv4(skb, IPPROTO_UDP);
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else
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return TC_ACT_OK;
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}
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@ -179,7 +224,7 @@ SEC("encap_ip6tnl")
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int __encap_ip6tnl(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
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return encap_ipv6(skb, false);
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return encap_ipv6(skb, IPPROTO_IPV6);
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else
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return TC_ACT_OK;
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}
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@ -188,23 +233,34 @@ SEC("encap_ip6gre")
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int __encap_ip6gre(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
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return encap_ipv6(skb, true);
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return encap_ipv6(skb, IPPROTO_GRE);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6udp")
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int __encap_ip6udp(struct __sk_buff *skb)
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{
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if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
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return encap_ipv6(skb, IPPROTO_UDP);
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else
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return TC_ACT_OK;
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}
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static int decap_internal(struct __sk_buff *skb, int off, int len, char proto)
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{
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char buf[sizeof(struct grev6hdr)];
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int olen;
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char buf[sizeof(struct v6hdr)];
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int olen = len;
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switch (proto) {
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case IPPROTO_IPIP:
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case IPPROTO_IPV6:
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olen = len;
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break;
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case IPPROTO_GRE:
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olen = len + 4 /* gre hdr */;
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olen += sizeof(struct gre_hdr);
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break;
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case IPPROTO_UDP:
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olen += sizeof(struct udphdr);
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break;
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default:
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return TC_ACT_OK;
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@ -15,6 +15,9 @@ readonly ns2_v4=192.168.1.2
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readonly ns1_v6=fd::1
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readonly ns2_v6=fd::2
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# Must match port used by bpf program
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readonly udpport=5555
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readonly infile="$(mktemp)"
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readonly outfile="$(mktemp)"
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@ -38,8 +41,8 @@ setup() {
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# clamp route to reserve room for tunnel headers
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ip -netns "${ns1}" -4 route flush table main
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ip -netns "${ns1}" -6 route flush table main
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ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1476 dev veth1
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ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1456 dev veth1
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ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1472 dev veth1
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ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1452 dev veth1
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sleep 1
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@ -103,6 +106,18 @@ if [[ "$#" -eq "0" ]]; then
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echo "ip6 gre gso"
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$0 ipv6 ip6gre 2000
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echo "ip udp"
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$0 ipv4 udp 100
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echo "ip6 udp"
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$0 ipv6 ip6udp 100
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echo "ip udp gso"
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$0 ipv4 udp 2000
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echo "ip6 udp gso"
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$0 ipv6 ip6udp 2000
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echo "OK. All tests passed"
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exit 0
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fi
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@ -117,12 +132,20 @@ case "$1" in
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"ipv4")
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readonly addr1="${ns1_v4}"
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readonly addr2="${ns2_v4}"
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readonly netcat_opt=-4
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readonly ipproto=4
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readonly netcat_opt=-${ipproto}
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readonly foumod=fou
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readonly foutype=ipip
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readonly fouproto=4
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;;
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"ipv6")
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readonly addr1="${ns1_v6}"
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readonly addr2="${ns2_v6}"
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readonly netcat_opt=-6
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readonly ipproto=6
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readonly netcat_opt=-${ipproto}
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readonly foumod=fou6
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readonly foutype=ip6tnl
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readonly fouproto="41 -6"
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;;
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*)
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echo "unknown arg: $1"
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@ -155,11 +178,23 @@ echo "test bpf encap without decap (expect failure)"
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server_listen
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! client_connect
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if [[ "$tuntype" =~ "udp" ]]; then
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# Set up fou tunnel.
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ttype="${foutype}"
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targs="encap fou encap-sport auto encap-dport $udpport"
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# fou may be a module; allow this to fail.
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modprobe "${foumod}" ||true
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ip netns exec "${ns2}" ip fou add port 5555 ipproto ${fouproto}
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else
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ttype=$tuntype
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targs=""
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fi
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# serverside, insert decap module
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# server is still running
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# client can connect again
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ip netns exec "${ns2}" ip link add dev testtun0 type "${tuntype}" \
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remote "${addr1}" local "${addr2}"
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ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
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remote "${addr1}" local "${addr2}" $targs
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# Because packets are decapped by the tunnel they arrive on testtun0 from
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# the IP stack perspective. Ensure reverse path filtering is disabled
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# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
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Reference in a new issue