package/libs/libnetfilter-queue/patches/100-checksum_computation.patch

   1 --- a/src/extra/checksum.c
   2 +++ b/src/extra/checksum.c
   3 @@ -11,6 +11,7 @@
   4
   5  #include <stdio.h>
   6  #include <stdbool.h>
   7 +#include <endian.h>
   8  #include <arpa/inet.h>
   9  #include <netinet/ip.h>
  10  #include <netinet/ip6.h>
  11 @@ -26,8 +27,13 @@ uint16_t checksum(uint32_t sum, uint16_t
  12                 sum += *buf++;
  13                 size -= sizeof(uint16_t);
  14         }
  15 -       if (size)
  16 -               sum += *(uint8_t *)buf;
  17 +       if (size) {
  18 +#if __BYTE_ORDER == __BIG_ENDIAN
  19 +               sum += (uint16_t)*(uint8_t *)buf << 8;
  20 +#else
  21 +               sum += (uint16_t)*(uint8_t *)buf;
  22 +#endif
  23 +       }
  24
  25         sum = (sum >> 16) + (sum & 0xffff);
  26         sum += (sum >>16);
  27 @@ -35,7 +41,7 @@ uint16_t checksum(uint32_t sum, uint16_t
  28         return (uint16_t)(~sum);
  29  }
  30
  31 -uint16_t checksum_tcpudp_ipv4(struct iphdr *iph)
  32 +uint16_t checksum_tcpudp_ipv4(struct iphdr *iph, uint16_t protocol_id)
  33  {
  34         uint32_t sum = 0;
  35         uint32_t iph_len = iph->ihl*4;
  36 @@ -46,13 +52,13 @@ uint16_t checksum_tcpudp_ipv4(struct iph
  37         sum += (iph->saddr) & 0xFFFF;
  38         sum += (iph->daddr >> 16) & 0xFFFF;
  39         sum += (iph->daddr) & 0xFFFF;
  40 -       sum += htons(IPPROTO_TCP);
  41 +       sum += htons(protocol_id);
  42         sum += htons(len);
  43
  44         return checksum(sum, (uint16_t *)payload, len);
  45  }
  46
  47 -uint16_t checksum_tcpudp_ipv6(struct ip6_hdr *ip6h, void *transport_hdr)
  48 +uint16_t checksum_tcpudp_ipv6(struct ip6_hdr *ip6h, void *transport_hdr, uint16_t protocol_id)
  49  {
  50         uint32_t sum = 0;
  51         uint32_t hdr_len = (uint32_t *)transport_hdr - (uint32_t *)ip6h;
  52 @@ -68,7 +74,7 @@ uint16_t checksum_tcpudp_ipv6(struct ip6
  53                 sum += (ip6h->ip6_dst.s6_addr16[i] >> 16) & 0xFFFF;
  54                 sum += (ip6h->ip6_dst.s6_addr16[i]) & 0xFFFF;
  55         }
  56 -       sum += htons(IPPROTO_TCP);
  57 +       sum += htons(protocol_id);
  58         sum += htons(ip6h->ip6_plen);
  59
  60         return checksum(sum, (uint16_t *)payload, len);
  61 --- a/src/extra/tcp.c
  62 +++ b/src/extra/tcp.c
  63 @@ -91,7 +91,7 @@ nfq_tcp_compute_checksum_ipv4(struct tcp
  64  {
  65         /* checksum field in header needs to be zero for calculation. */
  66         tcph->check = 0;
  67 -       tcph->check = checksum_tcpudp_ipv4(iph);
  68 +       tcph->check = checksum_tcpudp_ipv4(iph, IPPROTO_TCP);
  69  }
  70  EXPORT_SYMBOL(nfq_tcp_compute_checksum_ipv4);
  71
  72 @@ -105,7 +105,7 @@ nfq_tcp_compute_checksum_ipv6(struct tcp
  73  {
  74         /* checksum field in header needs to be zero for calculation. */
  75         tcph->check = 0;
  76 -       tcph->check = checksum_tcpudp_ipv6(ip6h, tcph);
  77 +       tcph->check = checksum_tcpudp_ipv6(ip6h, tcph, IPPROTO_TCP);
  78  }
  79  EXPORT_SYMBOL(nfq_tcp_compute_checksum_ipv6);
  80
  81 --- a/src/extra/udp.c
  82 +++ b/src/extra/udp.c
  83 @@ -91,7 +91,7 @@ nfq_udp_compute_checksum_ipv4(struct udp
  84  {
  85         /* checksum field in header needs to be zero for calculation. */
  86         udph->check = 0;
  87 -       udph->check = checksum_tcpudp_ipv4(iph);
  88 +       udph->check = checksum_tcpudp_ipv4(iph, IPPROTO_UDP);
  89  }
  90  EXPORT_SYMBOL(nfq_udp_compute_checksum_ipv4);
  91
  92 @@ -110,7 +110,7 @@ nfq_udp_compute_checksum_ipv6(struct udp
  93  {
  94         /* checksum field in header needs to be zero for calculation. */
  95         udph->check = 0;
  96 -       udph->check = checksum_tcpudp_ipv6(ip6h, udph);
  97 +       udph->check = checksum_tcpudp_ipv6(ip6h, udph, IPPROTO_UDP);
  98  }
  99  EXPORT_SYMBOL(nfq_udp_compute_checksum_ipv6);
 100
 101 --- a/src/internal.h
 102 +++ b/src/internal.h
 103 @@ -13,8 +13,8 @@ struct iphdr;
 104  struct ip6_hdr;
 105
 106  uint16_t checksum(uint32_t sum, uint16_t *buf, int size);
 107 -uint16_t checksum_tcpudp_ipv4(struct iphdr *iph);
 108 -uint16_t checksum_tcpudp_ipv6(struct ip6_hdr *ip6h, void *transport_hdr);
 109 +uint16_t checksum_tcpudp_ipv4(struct iphdr *iph, uint16_t protocol_id);
 110 +uint16_t checksum_tcpudp_ipv6(struct ip6_hdr *ip6h, void *transport_hdr, uint16_t protocol_id);
 111
 112  struct pkt_buff {
 113         uint8_t *mac_header;