projects / linux-2.6-block.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 | ||
| 4068579e TH |
78 | /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels) |
| 79 | * we accept a checksum of zero here. When we find the socket | |
| 80 | * for the UDP packet we'll check if that socket allows zero checksum | |
| 81 | * for IPv6 (set by socket option). | |
| 82 | */ | |
| 83 | return skb_checksum_init_zero_check(skb, proto, uh->check, | |
| 84 | ip6_compute_pseudo); | |
| acb3e041 CW |
85 | } |
| 86 | EXPORT_SYMBOL(udp6_csum_init); | |
| af5fcba7 TH |
87 | |
| 88 | /* Function to set UDP checksum for an IPv6 UDP packet. This is intended | |
| 89 | * for the simple case like when setting the checksum for a UDP tunnel. | |
| 90 | */ | |
| 91 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, | |
| 92 | const struct in6_addr *saddr, | |
| 93 | const struct in6_addr *daddr, int len) | |
| 94 | { | |
| 95 | struct udphdr *uh = udp_hdr(skb); | |
| 96 | ||
| 97 | if (nocheck) | |
| 98 | uh->check = 0; | |
| 99 | else if (skb_is_gso(skb)) | |
| 100 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
| 101 | else if (skb_dst(skb) && skb_dst(skb)->dev && | |
| 102 | (skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) { | |
| 103 | ||
| 104 | BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL); | |
| 105 | ||
| 106 | skb->ip_summed = CHECKSUM_PARTIAL; | |
| 107 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
| 108 | skb->csum_offset = offsetof(struct udphdr, check); | |
| 109 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
| 110 | } else { | |
| 111 | __wsum csum; | |
| 112 | ||
| 113 | BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL); | |
| 114 | ||
| 115 | uh->check = 0; | |
| 116 | csum = skb_checksum(skb, 0, len, 0); | |
| 117 | uh->check = udp_v6_check(len, saddr, daddr, csum); | |
| 118 | if (uh->check == 0) | |
| 119 | uh->check = CSUM_MANGLED_0; | |
| 120 | ||
| 121 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
| 122 | } | |
| 123 | } | |
| 124 | EXPORT_SYMBOL(udp6_set_csum); |