static unsigned int sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb) { u32 h, h2; switch (skb->protocol) { case htons(ETH_P_IP): { const struct iphdr *iph; int poff; if (!pskb_network_may_pull(skb, sizeof(*iph))) goto err; iph = ip_hdr(skb); h = (__force u32)iph->daddr; h2 = (__force u32)iph->saddr ^ iph->protocol; if (iph->frag_off & htons(IP_MF | IP_OFFSET)) break; poff = proto_ports_offset(iph->protocol); if (poff >= 0 && pskb_network_may_pull(skb, iph->ihl * 4 + 4 + poff)) { iph = ip_hdr(skb); h2 ^= *(u32 *)((void *)iph + iph->ihl * 4 + poff); } break; } case htons(ETH_P_IPV6): { const struct ipv6hdr *iph; int poff; if (!pskb_network_may_pull(skb, sizeof(*iph))) goto err; iph = ipv6_hdr(skb); h = (__force u32)iph->daddr.s6_addr32[3]; h2 = (__force u32)iph->saddr.s6_addr32[3] ^ iph->nexthdr; poff = proto_ports_offset(iph->nexthdr); if (poff >= 0 && pskb_network_may_pull(skb, sizeof(*iph) + 4 + poff)) { iph = ipv6_hdr(skb); h2 ^= *(u32 *)((void *)iph + sizeof(*iph) + poff); } break; } default: err: h = (unsigned long)skb_dst(skb) ^ (__force u32)skb->protocol; h2 = (unsigned long)skb->sk; } return sfq_fold_hash(q, h, h2); }
static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb) { u32 h, h2; switch (skb->protocol) { case __constant_htons(ETH_P_IP): { const struct iphdr *iph = ip_hdr(skb); h = iph->daddr; h2 = iph->saddr ^ iph->protocol; if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) && (iph->protocol == IPPROTO_TCP || iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_UDPLITE || iph->protocol == IPPROTO_SCTP || iph->protocol == IPPROTO_DCCP || iph->protocol == IPPROTO_ESP)) h2 ^= *(((u32*)iph) + iph->ihl); break; } case __constant_htons(ETH_P_IPV6): { struct ipv6hdr *iph = ipv6_hdr(skb); h = iph->daddr.s6_addr32[3]; h2 = iph->saddr.s6_addr32[3] ^ iph->nexthdr; if (iph->nexthdr == IPPROTO_TCP || iph->nexthdr == IPPROTO_UDP || iph->nexthdr == IPPROTO_UDPLITE || iph->nexthdr == IPPROTO_SCTP || iph->nexthdr == IPPROTO_DCCP || iph->nexthdr == IPPROTO_ESP) h2 ^= *(u32*)&iph[1]; break; } default: h = (unsigned long)skb->dst ^ skb->protocol; h2 = (unsigned long)skb->sk; } return sfq_fold_hash(q, h, h2); }