mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-11 00:04:33 +08:00
3e689141e6
Fix all selftests to include libbpf header files with the bpf/ prefix, to
be consistent with external users of the library. Also ensure that all
includes of exported libbpf header files (those that are exported on 'make
install' of the library) use bracketed includes instead of quoted.
To not break the build, keep the old include path until everything has been
changed to the new one; a subsequent patch will remove that.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560568.1683545.9649335788846513446.stgit@toke.dk
537 lines
12 KiB
C
537 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* In-place tunneling */
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#include <stdbool.h>
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#include <string.h>
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/mpls.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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#include <bpf/bpf_endian.h>
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#include <bpf/bpf_helpers.h>
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static const int cfg_port = 8000;
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static const int cfg_udp_src = 20000;
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#define UDP_PORT 5555
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#define MPLS_OVER_UDP_PORT 6635
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#define ETH_OVER_UDP_PORT 7777
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/* MPLS label 1000 with S bit (last label) set and ttl of 255. */
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static const __u32 mpls_label = __bpf_constant_htonl(1000 << 12 |
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MPLS_LS_S_MASK | 0xff);
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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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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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__u8 pad[16]; /* enough space for L2 header */
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} __attribute__((packed));
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struct v6hdr {
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struct ipv6hdr ip;
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union l4hdr l4hdr;
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__u8 pad[16]; /* enough space for L2 header */
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} __attribute__((packed));
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static __always_inline void set_ipv4_csum(struct iphdr *iph)
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{
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__u16 *iph16 = (__u16 *)iph;
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__u32 csum;
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int i;
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iph->check = 0;
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#pragma clang loop unroll(full)
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for (i = 0, csum = 0; i < sizeof(*iph) >> 1; i++)
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csum += *iph16++;
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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, __u8 encap_proto,
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__u16 l2_proto)
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{
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__u16 udp_dst = UDP_PORT;
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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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int olen, l2_len;
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int tcp_off;
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__u64 flags;
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/* Most tests encapsulate a packet into a tunnel with the same
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* network protocol, and derive the outer header fields from
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* the inner header.
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*
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* The 6in4 case tests different inner and outer protocols. As
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* the inner is ipv6, but the outer expects an ipv4 header as
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* input, manually build a struct iphdr based on the ipv6hdr.
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*/
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if (encap_proto == IPPROTO_IPV6) {
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const __u32 saddr = (192 << 24) | (168 << 16) | (1 << 8) | 1;
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const __u32 daddr = (192 << 24) | (168 << 16) | (1 << 8) | 2;
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struct ipv6hdr iph6_inner;
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/* Read the IPv6 header */
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if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph6_inner,
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sizeof(iph6_inner)) < 0)
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return TC_ACT_OK;
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/* Derive the IPv4 header fields from the IPv6 header */
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memset(&iph_inner, 0, sizeof(iph_inner));
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iph_inner.version = 4;
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iph_inner.ihl = 5;
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iph_inner.tot_len = bpf_htons(sizeof(iph6_inner) +
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bpf_ntohs(iph6_inner.payload_len));
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iph_inner.ttl = iph6_inner.hop_limit - 1;
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iph_inner.protocol = iph6_inner.nexthdr;
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iph_inner.saddr = __bpf_constant_htonl(saddr);
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iph_inner.daddr = __bpf_constant_htonl(daddr);
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tcp_off = sizeof(iph6_inner);
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} else {
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if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
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sizeof(iph_inner)) < 0)
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return TC_ACT_OK;
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tcp_off = sizeof(iph_inner);
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}
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/* filter only packets we want */
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if (iph_inner.ihl != 5 || iph_inner.protocol != IPPROTO_TCP)
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return TC_ACT_OK;
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if (bpf_skb_load_bytes(skb, ETH_HLEN + tcp_off,
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&tcph, sizeof(tcph)) < 0)
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return TC_ACT_OK;
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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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l2_len = 0;
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flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV4;
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switch (l2_proto) {
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case ETH_P_MPLS_UC:
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l2_len = sizeof(mpls_label);
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udp_dst = MPLS_OVER_UDP_PORT;
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break;
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case ETH_P_TEB:
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l2_len = ETH_HLEN;
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udp_dst = ETH_OVER_UDP_PORT;
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break;
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}
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flags |= BPF_F_ADJ_ROOM_ENCAP_L2(l2_len);
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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(l2_proto);
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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_htons(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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l2_len);
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break;
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case IPPROTO_IPIP:
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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 L2 encap (if specified) */
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switch (l2_proto) {
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case ETH_P_MPLS_UC:
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*((__u32 *)((__u8 *)&h_outer + olen)) = mpls_label;
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break;
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case ETH_P_TEB:
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if (bpf_skb_load_bytes(skb, 0, (__u8 *)&h_outer + olen,
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ETH_HLEN))
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return TC_ACT_SHOT;
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break;
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}
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olen += l2_len;
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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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return TC_ACT_SHOT;
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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_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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/* store new outer network header */
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if (bpf_skb_store_bytes(skb, ETH_HLEN, &h_outer, olen,
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BPF_F_INVALIDATE_HASH) < 0)
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return TC_ACT_SHOT;
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/* if changing outer proto type, update eth->h_proto */
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if (encap_proto == IPPROTO_IPV6) {
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struct ethhdr eth;
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if (bpf_skb_load_bytes(skb, 0, ð, sizeof(eth)) < 0)
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return TC_ACT_SHOT;
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eth.h_proto = bpf_htons(ETH_P_IP);
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if (bpf_skb_store_bytes(skb, 0, ð, sizeof(eth), 0) < 0)
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return TC_ACT_SHOT;
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}
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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, __u8 encap_proto,
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__u16 l2_proto)
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{
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__u16 udp_dst = UDP_PORT;
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struct ipv6hdr iph_inner;
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struct v6hdr h_outer;
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struct tcphdr tcph;
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int olen, l2_len;
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__u16 tot_len;
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__u64 flags;
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if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
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sizeof(iph_inner)) < 0)
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return TC_ACT_OK;
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/* filter only packets we want */
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if (bpf_skb_load_bytes(skb, ETH_HLEN + sizeof(iph_inner),
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&tcph, sizeof(tcph)) < 0)
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return TC_ACT_OK;
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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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l2_len = 0;
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flags = BPF_F_ADJ_ROOM_FIXED_GSO | BPF_F_ADJ_ROOM_ENCAP_L3_IPV6;
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switch (l2_proto) {
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case ETH_P_MPLS_UC:
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l2_len = sizeof(mpls_label);
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udp_dst = MPLS_OVER_UDP_PORT;
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break;
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case ETH_P_TEB:
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l2_len = ETH_HLEN;
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udp_dst = ETH_OVER_UDP_PORT;
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break;
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}
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flags |= BPF_F_ADJ_ROOM_ENCAP_L2(l2_len);
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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(l2_proto);
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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_htons(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 L2 encap (if specified) */
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switch (l2_proto) {
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case ETH_P_MPLS_UC:
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*((__u32 *)((__u8 *)&h_outer + olen)) = mpls_label;
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break;
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case ETH_P_TEB:
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if (bpf_skb_load_bytes(skb, 0, (__u8 *)&h_outer + olen,
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ETH_HLEN))
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return TC_ACT_SHOT;
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break;
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}
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olen += l2_len;
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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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return TC_ACT_SHOT;
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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.payload_len = bpf_htons(olen +
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bpf_ntohs(h_outer.ip.payload_len));
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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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BPF_F_INVALIDATE_HASH) < 0)
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return TC_ACT_SHOT;
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return TC_ACT_OK;
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}
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SEC("encap_ipip_none")
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int __encap_ipip_none(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_IPIP, ETH_P_IP);
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else
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return TC_ACT_OK;
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}
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SEC("encap_gre_none")
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int __encap_gre_none(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_GRE, ETH_P_IP);
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else
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return TC_ACT_OK;
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}
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SEC("encap_gre_mpls")
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int __encap_gre_mpls(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_GRE, ETH_P_MPLS_UC);
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else
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return TC_ACT_OK;
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}
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SEC("encap_gre_eth")
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int __encap_gre_eth(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_GRE, ETH_P_TEB);
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else
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return TC_ACT_OK;
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}
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SEC("encap_udp_none")
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int __encap_udp_none(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, ETH_P_IP);
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else
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return TC_ACT_OK;
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}
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SEC("encap_udp_mpls")
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int __encap_udp_mpls(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, ETH_P_MPLS_UC);
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else
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return TC_ACT_OK;
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}
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SEC("encap_udp_eth")
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int __encap_udp_eth(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, ETH_P_TEB);
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else
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return TC_ACT_OK;
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}
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SEC("encap_sit_none")
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int __encap_sit_none(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_ipv4(skb, IPPROTO_IPV6, ETH_P_IP);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6tnl_none")
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int __encap_ip6tnl_none(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_IPV6, ETH_P_IPV6);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6gre_none")
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int __encap_ip6gre_none(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_GRE, ETH_P_IPV6);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6gre_mpls")
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int __encap_ip6gre_mpls(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_GRE, ETH_P_MPLS_UC);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6gre_eth")
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int __encap_ip6gre_eth(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_GRE, ETH_P_TEB);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6udp_none")
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int __encap_ip6udp_none(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, ETH_P_IPV6);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6udp_mpls")
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int __encap_ip6udp_mpls(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, ETH_P_MPLS_UC);
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else
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return TC_ACT_OK;
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}
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SEC("encap_ip6udp_eth")
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int __encap_ip6udp_eth(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, ETH_P_TEB);
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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 v6hdr)];
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struct gre_hdr greh;
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struct udphdr udph;
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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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break;
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case IPPROTO_GRE:
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olen += sizeof(struct gre_hdr);
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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;
|
|
}
|
|
|
|
if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC,
|
|
BPF_F_ADJ_ROOM_FIXED_GSO))
|
|
return TC_ACT_SHOT;
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
static int decap_ipv4(struct __sk_buff *skb)
|
|
{
|
|
struct iphdr iph_outer;
|
|
|
|
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_outer,
|
|
sizeof(iph_outer)) < 0)
|
|
return TC_ACT_OK;
|
|
|
|
if (iph_outer.ihl != 5)
|
|
return TC_ACT_OK;
|
|
|
|
return decap_internal(skb, ETH_HLEN, sizeof(iph_outer),
|
|
iph_outer.protocol);
|
|
}
|
|
|
|
static int decap_ipv6(struct __sk_buff *skb)
|
|
{
|
|
struct ipv6hdr iph_outer;
|
|
|
|
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_outer,
|
|
sizeof(iph_outer)) < 0)
|
|
return TC_ACT_OK;
|
|
|
|
return decap_internal(skb, ETH_HLEN, sizeof(iph_outer),
|
|
iph_outer.nexthdr);
|
|
}
|
|
|
|
SEC("decap")
|
|
int decap_f(struct __sk_buff *skb)
|
|
{
|
|
switch (skb->protocol) {
|
|
case __bpf_constant_htons(ETH_P_IP):
|
|
return decap_ipv4(skb);
|
|
case __bpf_constant_htons(ETH_P_IPV6):
|
|
return decap_ipv6(skb);
|
|
default:
|
|
/* does not match, ignore */
|
|
return TC_ACT_OK;
|
|
}
|
|
}
|
|
|
|
char __license[] SEC("license") = "GPL";
|