samples/bpf/sockex2_kern.c

46 static inline int ip_is_fragment(struct __sk_buff *ctx, __u64 nhoff)
48 	return load_half(ctx, nhoff + offsetof(struct iphdr, frag_off))
62 static inline __u64 parse_ip(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
67 	if (unlikely(ip_is_fragment(skb, nhoff)))
70 		*ip_proto = load_byte(skb, nhoff + offsetof(struct iphdr, protocol));
73 		flow->src = load_word(skb, nhoff + offsetof(struct iphdr, saddr));
74 		flow->dst = load_word(skb, nhoff + offsetof(struct iphdr, daddr));
77 	verlen = load_byte(skb, nhoff + 0/*offsetof(struct iphdr, ihl)*/);
79 		nhoff += 20;
81 		nhoff += (verlen & 0xF) << 2;
83 	return nhoff;
86 static inline __u64 parse_ipv6(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
90 			      nhoff + offsetof(struct ipv6hdr, nexthdr));
92 				   nhoff + offsetof(struct ipv6hdr, saddr));
94 				   nhoff + offsetof(struct ipv6hdr, daddr));
95 	nhoff += sizeof(struct ipv6hdr);
97 	return nhoff;
103 	__u64 nhoff = ETH_HLEN;
109 		proto = load_half(skb, nhoff + offsetof(struct vlan_hdr,
111 		nhoff += sizeof(struct vlan_hdr);
115 		proto = load_half(skb, nhoff + offsetof(struct vlan_hdr,
117 		nhoff += sizeof(struct vlan_hdr);
121 		nhoff = parse_ip(skb, nhoff, &ip_proto, flow);
123 		nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow);
135 					    nhoff + offsetof(struct gre_hdr, flags));
137 					    nhoff + offsetof(struct gre_hdr, proto));
143 		nhoff += 4;
145 			nhoff += 4;
147 			nhoff += 4;
149 			nhoff += 4;
153 					  nhoff + offsetof(struct vlan_hdr,
155 			nhoff += sizeof(struct vlan_hdr);
159 			nhoff = parse_ip(skb, nhoff, &ip_proto, flow);
161 			nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow);
167 		nhoff = parse_ip(skb, nhoff, &ip_proto, flow);
170 		nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow);
179 		nhoff += poff;
180 		flow->ports = load_word(skb, nhoff);
183 	flow->thoff = (__u16) nhoff;