projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 33f11d16 TH |
1 | #include <linux/errno.h> |
| 2 | #include <linux/ip.h> | |
| 3 | #include <linux/kernel.h> | |
| 4 | #include <linux/module.h> | |
| 5 | #include <linux/skbuff.h> | |
| 6 | #include <linux/socket.h> | |
| 7 | #include <linux/types.h> | |
| 8 | #include <net/checksum.h> | |
| 9 | #include <net/ip.h> | |
| 10 | #include <net/ip6_fib.h> | |
| 11 | #include <net/lwtunnel.h> | |
| 12 | #include <net/protocol.h> | |
| 13 | #include <uapi/linux/ila.h> | |
| 14 | #include "ila.h" | |
| 15 | ||
| 16 | static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p) | |
| 17 | { | |
| 18 | if (*(__be64 *)&ip6h->daddr == p->locator_match) | |
| 19 | return p->csum_diff; | |
| 20 | else | |
| 21 | return compute_csum_diff8((__be32 *)&ip6h->daddr, | |
| 22 | (__be32 *)&p->locator); | |
| 23 | } | |
| 24 | ||
| 25 | void update_ipv6_locator(struct sk_buff *skb, struct ila_params *p) | |
| 26 | { | |
| 27 | __wsum diff; | |
| 28 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
| 29 | size_t nhoff = sizeof(struct ipv6hdr); | |
| 30 | ||
| 31 | /* First update checksum */ | |
| 32 | switch (ip6h->nexthdr) { | |
| 33 | case NEXTHDR_TCP: | |
| 34 | if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) { | |
| 35 | struct tcphdr *th = (struct tcphdr *) | |
| 36 | (skb_network_header(skb) + nhoff); | |
| 37 | ||
| 38 | diff = get_csum_diff(ip6h, p); | |
| 39 | inet_proto_csum_replace_by_diff(&th->check, skb, | |
| 40 | diff, true); | |
| 41 | } | |
| 42 | break; | |
| 43 | case NEXTHDR_UDP: | |
| 44 | if (likely(pskb_may_pull(skb, nhoff + sizeof(struct udphdr)))) { | |
| 45 | struct udphdr *uh = (struct udphdr *) | |
| 46 | (skb_network_header(skb) + nhoff); | |
| 47 | ||
| 48 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
| 49 | diff = get_csum_diff(ip6h, p); | |
| 50 | inet_proto_csum_replace_by_diff(&uh->check, skb, | |
| 51 | diff, true); | |
| 52 | if (!uh->check) | |
| 53 | uh->check = CSUM_MANGLED_0; | |
| 54 | } | |
| 55 | } | |
| 56 | break; | |
| 57 | case NEXTHDR_ICMP: | |
| 58 | if (likely(pskb_may_pull(skb, | |
| 59 | nhoff + sizeof(struct icmp6hdr)))) { | |
| 60 | struct icmp6hdr *ih = (struct icmp6hdr *) | |
| 61 | (skb_network_header(skb) + nhoff); | |
| 62 | ||
| 63 | diff = get_csum_diff(ip6h, p); | |
| 64 | inet_proto_csum_replace_by_diff(&ih->icmp6_cksum, skb, | |
| 65 | diff, true); | |
| 66 | } | |
| 67 | break; | |
| 68 | } | |
| 69 | ||
| 70 | /* Now change destination address */ | |
| 71 | *(__be64 *)&ip6h->daddr = p->locator; | |
| 72 | } | |
| 73 | ||
| 74 | static int __init ila_init(void) | |
| 75 | { | |
| 76 | int ret; | |
| 77 | ||
| 78 | ret = ila_lwt_init(); | |
| 79 | ||
| 80 | if (ret) | |
| 81 | goto fail_lwt; | |
| 82 | ||
| 7f00feaf TH |
83 | ret = ila_xlat_init(); |
| 84 | if (ret) | |
| 85 | goto fail_xlat; | |
| 86 | ||
| 87 | return 0; | |
| 88 | fail_xlat: | |
| 89 | ila_lwt_fini(); | |
| 33f11d16 TH |
90 | fail_lwt: |
| 91 | return ret; | |
| 92 | } | |
| 93 | ||
| 94 | static void __exit ila_fini(void) | |
| 95 | { | |
| 7f00feaf | 96 | ila_xlat_fini(); |
| 33f11d16 TH |
97 | ila_lwt_fini(); |
| 98 | } | |
| 99 | ||
| 100 | module_init(ila_init); | |
| 101 | module_exit(ila_fini); | |
| 102 | MODULE_AUTHOR("Tom Herbert <tom@herbertland.com>"); | |
| 103 | MODULE_LICENSE("GPL"); |