projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| acb3e041 CW |
1 | #include <net/ip.h> |
| 2 | #include <net/udp.h> | |
| 3 | #include <net/udplite.h> | |
| 4 | #include <asm/checksum.h> | |
| 5 | ||
| 6 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
| 7 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
| 8 | const struct in6_addr *daddr, | |
| 9 | __u32 len, unsigned short proto, | |
| 10 | __wsum csum) | |
| 11 | { | |
| 12 | ||
| 13 | int carry; | |
| 14 | __u32 ulen; | |
| 15 | __u32 uproto; | |
| 16 | __u32 sum = (__force u32)csum; | |
| 17 | ||
| 18 | sum += (__force u32)saddr->s6_addr32[0]; | |
| 19 | carry = (sum < (__force u32)saddr->s6_addr32[0]); | |
| 20 | sum += carry; | |
| 21 | ||
| 22 | sum += (__force u32)saddr->s6_addr32[1]; | |
| 23 | carry = (sum < (__force u32)saddr->s6_addr32[1]); | |
| 24 | sum += carry; | |
| 25 | ||
| 26 | sum += (__force u32)saddr->s6_addr32[2]; | |
| 27 | carry = (sum < (__force u32)saddr->s6_addr32[2]); | |
| 28 | sum += carry; | |
| 29 | ||
| 30 | sum += (__force u32)saddr->s6_addr32[3]; | |
| 31 | carry = (sum < (__force u32)saddr->s6_addr32[3]); | |
| 32 | sum += carry; | |
| 33 | ||
| 34 | sum += (__force u32)daddr->s6_addr32[0]; | |
| 35 | carry = (sum < (__force u32)daddr->s6_addr32[0]); | |
| 36 | sum += carry; | |
| 37 | ||
| 38 | sum += (__force u32)daddr->s6_addr32[1]; | |
| 39 | carry = (sum < (__force u32)daddr->s6_addr32[1]); | |
| 40 | sum += carry; | |
| 41 | ||
| 42 | sum += (__force u32)daddr->s6_addr32[2]; | |
| 43 | carry = (sum < (__force u32)daddr->s6_addr32[2]); | |
| 44 | sum += carry; | |
| 45 | ||
| 46 | sum += (__force u32)daddr->s6_addr32[3]; | |
| 47 | carry = (sum < (__force u32)daddr->s6_addr32[3]); | |
| 48 | sum += carry; | |
| 49 | ||
| 50 | ulen = (__force u32)htonl((__u32) len); | |
| 51 | sum += ulen; | |
| 52 | carry = (sum < ulen); | |
| 53 | sum += carry; | |
| 54 | ||
| 55 | uproto = (__force u32)htonl(proto); | |
| 56 | sum += uproto; | |
| 57 | carry = (sum < uproto); | |
| 58 | sum += carry; | |
| 59 | ||
| 60 | return csum_fold((__force __wsum)sum); | |
| 61 | } | |
| 62 | EXPORT_SYMBOL(csum_ipv6_magic); | |
| 63 | #endif | |
| 64 | ||
| 65 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto) | |
| 66 | { | |
| 67 | int err; | |
| 68 | ||
| 69 | UDP_SKB_CB(skb)->partial_cov = 0; | |
| 70 | UDP_SKB_CB(skb)->cscov = skb->len; | |
| 71 | ||
| 72 | if (proto == IPPROTO_UDPLITE) { | |
| 73 | err = udplite_checksum_init(skb, uh); | |
| 74 | if (err) | |
| 75 | return err; | |
| 76 | } | |
| 77 | ||
| 78 | if (uh->check == 0) { | |
| 79 | /* RFC 2460 section 8.1 says that we SHOULD log | |
| 80 | this error. Well, it is reasonable. | |
| 81 | */ | |
| 82 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
| 83 | return 1; | |
| 84 | } | |
| 85 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
| 86 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, | |
| 87 | skb->len, proto, skb->csum)) | |
| 88 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
| 89 | ||
| 90 | if (!skb_csum_unnecessary(skb)) | |
| 91 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, | |
| 92 | &ipv6_hdr(skb)->daddr, | |
| 93 | skb->len, proto, 0)); | |
| 94 | ||
| 95 | return 0; | |
| 96 | } | |
| 97 | EXPORT_SYMBOL(udp6_csum_init); |