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, | |
| 1e940829 | 9 | __u32 len, __u8 proto, __wsum csum) |
| acb3e041 CW |
10 | { |
| 11 | ||
| 12 | int carry; | |
| 13 | __u32 ulen; | |
| 14 | __u32 uproto; | |
| 15 | __u32 sum = (__force u32)csum; | |
| 16 | ||
| 17 | sum += (__force u32)saddr->s6_addr32[0]; | |
| 18 | carry = (sum < (__force u32)saddr->s6_addr32[0]); | |
| 19 | sum += carry; | |
| 20 | ||
| 21 | sum += (__force u32)saddr->s6_addr32[1]; | |
| 22 | carry = (sum < (__force u32)saddr->s6_addr32[1]); | |
| 23 | sum += carry; | |
| 24 | ||
| 25 | sum += (__force u32)saddr->s6_addr32[2]; | |
| 26 | carry = (sum < (__force u32)saddr->s6_addr32[2]); | |
| 27 | sum += carry; | |
| 28 | ||
| 29 | sum += (__force u32)saddr->s6_addr32[3]; | |
| 30 | carry = (sum < (__force u32)saddr->s6_addr32[3]); | |
| 31 | sum += carry; | |
| 32 | ||
| 33 | sum += (__force u32)daddr->s6_addr32[0]; | |
| 34 | carry = (sum < (__force u32)daddr->s6_addr32[0]); | |
| 35 | sum += carry; | |
| 36 | ||
| 37 | sum += (__force u32)daddr->s6_addr32[1]; | |
| 38 | carry = (sum < (__force u32)daddr->s6_addr32[1]); | |
| 39 | sum += carry; | |
| 40 | ||
| 41 | sum += (__force u32)daddr->s6_addr32[2]; | |
| 42 | carry = (sum < (__force u32)daddr->s6_addr32[2]); | |
| 43 | sum += carry; | |
| 44 | ||
| 45 | sum += (__force u32)daddr->s6_addr32[3]; | |
| 46 | carry = (sum < (__force u32)daddr->s6_addr32[3]); | |
| 47 | sum += carry; | |
| 48 | ||
| 49 | ulen = (__force u32)htonl((__u32) len); | |
| 50 | sum += ulen; | |
| 51 | carry = (sum < ulen); | |
| 52 | sum += carry; | |
| 53 | ||
| 54 | uproto = (__force u32)htonl(proto); | |
| 55 | sum += uproto; | |
| 56 | carry = (sum < uproto); | |
| 57 | sum += carry; | |
| 58 | ||
| 59 | return csum_fold((__force __wsum)sum); | |
| 60 | } | |
| 61 | EXPORT_SYMBOL(csum_ipv6_magic); | |
| 62 | #endif | |
| 63 | ||
| 64 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto) | |
| 65 | { | |
| 66 | int err; | |
| 67 | ||
| 68 | UDP_SKB_CB(skb)->partial_cov = 0; | |
| 69 | UDP_SKB_CB(skb)->cscov = skb->len; | |
| 70 | ||
| 71 | if (proto == IPPROTO_UDPLITE) { | |
| 72 | err = udplite_checksum_init(skb, uh); | |
| 73 | if (err) | |
| 74 | return err; | |
| 75 | } | |
| 76 | ||
| 4068579e TH |
77 | /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels) |
| 78 | * we accept a checksum of zero here. When we find the socket | |
| 79 | * for the UDP packet we'll check if that socket allows zero checksum | |
| 80 | * for IPv6 (set by socket option). | |
| c148d163 HFS |
81 | * |
| 82 | * Note, we are only interested in != 0 or == 0, thus the | |
| 83 | * force to int. | |
| 4068579e | 84 | */ |
| c148d163 HFS |
85 | return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, |
| 86 | ip6_compute_pseudo); | |
| acb3e041 CW |
87 | } |
| 88 | EXPORT_SYMBOL(udp6_csum_init); | |
| af5fcba7 TH |
89 | |
| 90 | /* Function to set UDP checksum for an IPv6 UDP packet. This is intended | |
| 91 | * for the simple case like when setting the checksum for a UDP tunnel. | |
| 92 | */ | |
| 93 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, | |
| 94 | const struct in6_addr *saddr, | |
| 95 | const struct in6_addr *daddr, int len) | |
| 96 | { | |
| 97 | struct udphdr *uh = udp_hdr(skb); | |
| 98 | ||
| 99 | if (nocheck) | |
| 100 | uh->check = 0; | |
| 101 | else if (skb_is_gso(skb)) | |
| 102 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
| 179bc67f EC |
103 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 104 | uh->check = 0; | |
| 105 | uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb)); | |
| 106 | if (uh->check == 0) | |
| 107 | uh->check = CSUM_MANGLED_0; | |
| d75f1306 | 108 | } else { |
| af5fcba7 TH |
109 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 110 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
| 111 | skb->csum_offset = offsetof(struct udphdr, check); | |
| 112 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
| af5fcba7 TH |
113 | } |
| 114 | } | |
| 115 | EXPORT_SYMBOL(udp6_set_csum); |