main.c aktualisiert
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main.c
136
main.c
@ -6,11 +6,14 @@
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <bpf/bpf_helpers.h>
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#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
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#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
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/* Forwarding ports */
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struct bpf_map_def SEC("maps") xdp_l3fwd_ports = {
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.type = BPF_MAP_TYPE_DEVMAP,
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.key_size = sizeof(int),
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@ -18,15 +21,63 @@ struct bpf_map_def SEC("maps") xdp_l3fwd_ports = {
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.max_entries = 512,
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};
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/* Stats key — identifies a connection or flow */
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struct flow_key {
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__u8 proto;
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__u8 pad[3]; /* alignment */
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union {
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__u32 ipv4_src;
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__u8 ipv6_src[16];
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};
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union {
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__u32 ipv4_dst;
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__u8 ipv6_dst[16];
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};
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__u16 sport;
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__u16 dport;
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};
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/* Stats value — counts packets and bytes */
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struct flow_stats {
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__u64 packets;
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__u64 bytes;
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};
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/* Hash map to track stats per flow */
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struct bpf_map_def SEC("maps") xdp_flow_stats = {
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.type = BPF_MAP_TYPE_HASH,
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.key_size = sizeof(struct flow_key),
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.value_size = sizeof(struct flow_stats),
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.max_entries = 65536,
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};
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/* Decrease IPv4 TTL helper */
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static __always_inline int ip_decrease_ttl(struct iphdr *iph)
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{
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u32 check = (__force u32)iph->check;
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check += (__force u32)htons(0x0100);
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iph->check = (__force __sum16)(check + (check >= 0xFFFF));
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return --iph->ttl;
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}
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/* Record stats in the xdp_flow_stats map */
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static __always_inline void record_stats(struct xdp_md *ctx, struct flow_key *key, __u64 bytes)
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{
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struct flow_stats *stats;
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stats = bpf_map_lookup_elem(&xdp_flow_stats, key);
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if (stats) {
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__sync_fetch_and_add(&stats->packets, 1);
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__sync_fetch_and_add(&stats->bytes, bytes);
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} else {
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struct flow_stats new_stats = {
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.packets = 1,
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.bytes = bytes,
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};
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bpf_map_update_elem(&xdp_flow_stats, key, &new_stats, BPF_ANY);
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}
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}
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static __always_inline int xdp_l3fwd_flags(struct xdp_md *ctx, u32 flags)
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{
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void *data_end = (void *)(long)ctx->data_end;
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@ -44,46 +95,85 @@ static __always_inline int xdp_l3fwd_flags(struct xdp_md *ctx, u32 flags)
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return XDP_DROP;
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__builtin_memset(&fib_params, 0, sizeof(fib_params));
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h_proto = eth->h_proto;
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struct flow_key key = {};
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__u64 bytes = data_end - data;
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if (h_proto == htons(ETH_P_IP)) {
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iph = data + nh_off;
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if (iph + 1 > data_end)
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if ((void *)(iph + 1) > data_end)
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return XDP_DROP;
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key.proto = iph->protocol;
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key.ipv4_src = iph->saddr;
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key.ipv4_dst = iph->daddr;
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void *l4_hdr = (void *)iph + (iph->ihl * 4);
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if (l4_hdr + sizeof(struct udphdr) <= data_end) {
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if (iph->protocol == IPPROTO_TCP) {
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struct tcphdr *tcph = l4_hdr;
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key.sport = tcph->source;
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key.dport = tcph->dest;
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} else if (iph->protocol == IPPROTO_UDP) {
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struct udphdr *udph = l4_hdr;
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key.sport = udph->source;
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key.dport = udph->dest;
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}
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}
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/* Record stats before forwarding */
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record_stats(ctx, &key, bytes);
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if (iph->ttl <= 1)
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return XDP_PASS;
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fib_params.family = AF_INET;
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fib_params.tos = iph->tos;
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fib_params.l4_protocol = iph->protocol;
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fib_params.tot_len = ntohs(iph->tot_len);
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fib_params.ipv4_src = iph->saddr;
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fib_params.ipv4_dst = iph->daddr;
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} else if (h_proto == htons(ETH_P_IPV6)) {
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struct in6_addr *src = (struct in6_addr *) fib_params.ipv6_src;
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struct in6_addr *dst = (struct in6_addr *) fib_params.ipv6_dst;
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fib_params.family = AF_INET;
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fib_params.tos = iph->tos;
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fib_params.l4_protocol = iph->protocol;
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fib_params.tot_len = ntohs(iph->tot_len);
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fib_params.ipv4_src = iph->saddr;
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fib_params.ipv4_dst = iph->daddr;
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} else if (h_proto == htons(ETH_P_IPV6)) {
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ip6h = data + nh_off;
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if (ip6h + 1 > data_end)
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if ((void *)(ip6h + 1) > data_end)
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return XDP_DROP;
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key.proto = ip6h->nexthdr;
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__builtin_memcpy(key.ipv6_src, &ip6h->saddr, 16);
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__builtin_memcpy(key.ipv6_dst, &ip6h->daddr, 16);
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void *l4_hdr = (void *)(ip6h + 1);
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if (l4_hdr + sizeof(struct udphdr) <= data_end) {
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if (ip6h->nexthdr == IPPROTO_TCP) {
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struct tcphdr *tcph = l4_hdr;
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key.sport = tcph->source;
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key.dport = tcph->dest;
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} else if (ip6h->nexthdr == IPPROTO_UDP) {
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struct udphdr *udph = l4_hdr;
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key.sport = udph->source;
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key.dport = udph->dest;
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}
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}
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/* Record stats before forwarding */
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record_stats(ctx, &key, bytes);
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if (ip6h->hop_limit <= 1)
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return XDP_PASS;
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fib_params.family = AF_INET6;
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fib_params.flowinfo = *(__be32 *)ip6h & IPV6_FLOWINFO_MASK;
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fib_params.l4_protocol = ip6h->nexthdr;
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fib_params.tot_len = ntohs(ip6h->payload_len);
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*src = ip6h->saddr;
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*dst = ip6h->daddr;
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fib_params.family = AF_INET6;
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fib_params.flowinfo = *(__be32 *)ip6h & IPV6_FLOWINFO_MASK;
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fib_params.l4_protocol = ip6h->nexthdr;
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fib_params.tot_len = ntohs(ip6h->payload_len);
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__builtin_memcpy(fib_params.ipv6_src, &ip6h->saddr, 16);
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__builtin_memcpy(fib_params.ipv6_dst, &ip6h->daddr, 16);
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} else {
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return XDP_PASS;
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}
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fib_params.ifindex = ctx->ingress_ifindex;
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rc = bpf_fib_lookup(ctx, &fib_params, sizeof(fib_params), flags);
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if (rc == BPF_FIB_LKUP_RET_SUCCESS) {
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if (!bpf_map_lookup_elem(&xdp_l3fwd_ports, &fib_params.ifindex))
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@ -114,4 +204,4 @@ int xdp_l3fwd_direct_prog(struct xdp_md *ctx)
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return xdp_l3fwd_flags(ctx, BPF_FIB_LOOKUP_DIRECT);
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}
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char _license[] SEC("license") = "GPL";
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char _license[] SEC("license") = "GPL";
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