1 // SPDX-License-Identifier: GPL-2.0
24 } rxcnt SEC(".maps");
31 } vip2tnl SEC(".maps");
52 			return -1;  in get_dport()
53 		return th->dest;  in get_dport()
57 			return -1;  in get_dport()
58 		return uh->dest;  in get_dport()
69 	memcpy(new_eth->h_source, old_eth->h_dest, sizeof(new_eth->h_source));  in set_ethhdr()
70 	memcpy(new_eth->h_dest, tnl->dmac, sizeof(new_eth->h_dest));  in set_ethhdr()
71 	new_eth->h_proto = h_proto;  in set_ethhdr()
76 	void *data_end = (void *)(long)xdp->data_end;  in handle_ipv4()
77 	void *data = (void *)(long)xdp->data;  in handle_ipv4()
92 	dport = get_dport(iph + 1, data_end, iph->protocol);  in handle_ipv4()
93 	if (dport == -1)  in handle_ipv4()
96 	vip.protocol = iph->protocol;  in handle_ipv4()
98 	vip.daddr.v4 = iph->daddr;  in handle_ipv4()
100 	payload_len = bpf_ntohs(iph->tot_len);  in handle_ipv4()
103 	/* It only does v4-in-v4 */  in handle_ipv4()
104 	if (!tnl || tnl->family != AF_INET)  in handle_ipv4()
107 	if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr)))  in handle_ipv4()
110 	data = (void *)(long)xdp->data;  in handle_ipv4()
111 	data_end = (void *)(long)xdp->data_end;  in handle_ipv4()
124 	iph->version = 4;  in handle_ipv4()
125 	iph->ihl = sizeof(*iph) >> 2;  in handle_ipv4()
126 	iph->frag_off =	0;  in handle_ipv4()
127 	iph->protocol = IPPROTO_IPIP;  in handle_ipv4()
128 	iph->check = 0;  in handle_ipv4()
129 	iph->tos = 0;  in handle_ipv4()
130 	iph->tot_len = bpf_htons(payload_len + sizeof(*iph));  in handle_ipv4()
131 	iph->daddr = tnl->daddr.v4;  in handle_ipv4()
132 	iph->saddr = tnl->saddr.v4;  in handle_ipv4()
133 	iph->ttl = 8;  in handle_ipv4()
140 	iph->check = ~((csum & 0xffff) + (csum >> 16));  in handle_ipv4()
149 	void *data_end = (void *)(long)xdp->data_end;  in handle_ipv6()
150 	void *data = (void *)(long)xdp->data;  in handle_ipv6()
162 	dport = get_dport(ip6h + 1, data_end, ip6h->nexthdr);  in handle_ipv6()
163 	if (dport == -1)  in handle_ipv6()
166 	vip.protocol = ip6h->nexthdr;  in handle_ipv6()
168 	memcpy(vip.daddr.v6, ip6h->daddr.s6_addr32, sizeof(vip.daddr));  in handle_ipv6()
170 	payload_len = ip6h->payload_len;  in handle_ipv6()
173 	/* It only does v6-in-v6 */  in handle_ipv6()
174 	if (!tnl || tnl->family != AF_INET6)  in handle_ipv6()
177 	if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr)))  in handle_ipv6()
180 	data = (void *)(long)xdp->data;  in handle_ipv6()
181 	data_end = (void *)(long)xdp->data_end;  in handle_ipv6()
193 	ip6h->version = 6;  in handle_ipv6()
194 	ip6h->priority = 0;  in handle_ipv6()
195 	memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));  in handle_ipv6()
196 	ip6h->payload_len = bpf_htons(bpf_ntohs(payload_len) + sizeof(*ip6h));  in handle_ipv6()
197 	ip6h->nexthdr = IPPROTO_IPV6;  in handle_ipv6()
198 	ip6h->hop_limit = 8;  in handle_ipv6()
199 	memcpy(ip6h->saddr.s6_addr32, tnl->saddr.v6, sizeof(tnl->saddr.v6));  in handle_ipv6()
200 	memcpy(ip6h->daddr.s6_addr32, tnl->daddr.v6, sizeof(tnl->daddr.v6));  in handle_ipv6()
207 SEC("xdp")
210 	void *data_end = (void *)(long)xdp->data_end;  in _xdp_tx_iptunnel()
211 	void *data = (void *)(long)xdp->data;  in _xdp_tx_iptunnel()
218 	h_proto = eth->h_proto;  in _xdp_tx_iptunnel()
229 char _license[] SEC("license") = "GPL";