1 // SPDX-License-Identifier: GPL-2.0
32 } rxcnt SEC(".maps");
39 } vip2tnl SEC(".maps");
58 		return th->dest;  in get_dport()
61 		return uh->dest;  in get_dport()
72 	memcpy(new_eth->h_source, old_eth->h_dest, sizeof(new_eth->h_source));  in set_ethhdr()
73 	memcpy(new_eth->h_dest, tnl->dmac, sizeof(new_eth->h_dest));  in set_ethhdr()
74 	new_eth->h_proto = h_proto;  in set_ethhdr()
98 	if (ethhdr_sz + iphdr_sz + tcphdr_sz > xdp->data_end - xdp->data)  in handle_ipv4()
106 	dport = get_dport(iph + 1, iph->protocol);  in handle_ipv4()
107 	if (dport == -1)  in handle_ipv4()
110 	vip.protocol = iph->protocol;  in handle_ipv4()
112 	vip.daddr.v4 = iph->daddr;  in handle_ipv4()
114 	payload_len = bpf_ntohs(iph->tot_len);  in handle_ipv4()
117 	/* It only does v4-in-v4 */  in handle_ipv4()
118 	if (!tnl || tnl->family != AF_INET)  in handle_ipv4()
121 	if (bpf_xdp_adjust_head(xdp, 0 - (int)iphdr_sz))  in handle_ipv4()
137 	iph->version = 4;  in handle_ipv4()
138 	iph->ihl = iphdr_sz >> 2;  in handle_ipv4()
139 	iph->frag_off =	0;  in handle_ipv4()
140 	iph->protocol = IPPROTO_IPIP;  in handle_ipv4()
141 	iph->check = 0;  in handle_ipv4()
142 	iph->tos = 0;  in handle_ipv4()
143 	iph->tot_len = bpf_htons(payload_len + iphdr_sz);  in handle_ipv4()
144 	iph->daddr = tnl->daddr.v4;  in handle_ipv4()
145 	iph->saddr = tnl->saddr.v4;  in handle_ipv4()
146 	iph->ttl = 8;  in handle_ipv4()
152 	iph->check = ~((csum & 0xffff) + (csum >> 16));  in handle_ipv4()
177 	if (ethhdr_sz + iphdr_sz + tcphdr_sz > xdp->data_end - xdp->data)  in handle_ipv6()
185 	dport = get_dport(ip6h + 1, ip6h->nexthdr);  in handle_ipv6()
186 	if (dport == -1)  in handle_ipv6()
189 	vip.protocol = ip6h->nexthdr;  in handle_ipv6()
191 	memcpy(vip.daddr.v6, ip6h->daddr.s6_addr32, sizeof(vip.daddr));  in handle_ipv6()
193 	payload_len = ip6h->payload_len;  in handle_ipv6()
196 	/* It only does v6-in-v6 */  in handle_ipv6()
197 	if (!tnl || tnl->family != AF_INET6)  in handle_ipv6()
200 	if (bpf_xdp_adjust_head(xdp, 0 - (int)ipv6hdr_sz))  in handle_ipv6()
216 	ip6h->version = 6;  in handle_ipv6()
217 	ip6h->priority = 0;  in handle_ipv6()
218 	memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));  in handle_ipv6()
219 	ip6h->payload_len = bpf_htons(bpf_ntohs(payload_len) + ipv6hdr_sz);  in handle_ipv6()
220 	ip6h->nexthdr = IPPROTO_IPV6;  in handle_ipv6()
221 	ip6h->hop_limit = 8;  in handle_ipv6()
222 	memcpy(ip6h->saddr.s6_addr32, tnl->saddr.v6, sizeof(tnl->saddr.v6));  in handle_ipv6()
223 	memcpy(ip6h->daddr.s6_addr32, tnl->daddr.v6, sizeof(tnl->daddr.v6));  in handle_ipv6()
230 SEC("xdp")
245 	h_proto = eth->h_proto;  in _xdp_tx_iptunnel()
256 char _license[] SEC("license") = "GPL";