#include <linux/errno.h>
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#include <linux/ip.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/types.h>
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#include <net/checksum.h>
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#include <net/ip.h>
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#include <net/ip6_fib.h>
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#include <net/lwtunnel.h>
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#include <net/protocol.h>
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#include <uapi/linux/ila.h>
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#include "ila.h"
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void ila_init_saved_csum(struct ila_params *p)
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{
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if (!p->locator_match.v64)
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return;
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p->csum_diff = compute_csum_diff8(
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(__be32 *)&p->locator,
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(__be32 *)&p->locator_match);
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}
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static __wsum get_csum_diff_iaddr(struct ila_addr *iaddr, struct ila_params *p)
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{
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if (p->locator_match.v64)
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return p->csum_diff;
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else
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return compute_csum_diff8((__be32 *)&p->locator,
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(__be32 *)&iaddr->loc);
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}
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static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
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{
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return get_csum_diff_iaddr(ila_a2i(&ip6h->daddr), p);
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}
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static void ila_csum_do_neutral_fmt(struct ila_addr *iaddr,
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struct ila_params *p)
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{
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__sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
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__wsum diff, fval;
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diff = get_csum_diff_iaddr(iaddr, p);
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fval = (__force __wsum)(ila_csum_neutral_set(iaddr->ident) ?
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CSUM_NEUTRAL_FLAG : ~CSUM_NEUTRAL_FLAG);
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diff = csum_add(diff, fval);
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*adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));
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/* Flip the csum-neutral bit. Either we are doing a SIR->ILA
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* translation with ILA_CSUM_NEUTRAL_MAP as the csum_method
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* and the C-bit is not set, or we are doing an ILA-SIR
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* tranlsation and the C-bit is set.
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*/
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iaddr->ident.csum_neutral ^= 1;
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}
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static void ila_csum_do_neutral_nofmt(struct ila_addr *iaddr,
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struct ila_params *p)
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{
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__sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
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__wsum diff;
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diff = get_csum_diff_iaddr(iaddr, p);
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*adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));
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}
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static void ila_csum_adjust_transport(struct sk_buff *skb,
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struct ila_params *p)
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{
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size_t nhoff = sizeof(struct ipv6hdr);
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struct ipv6hdr *ip6h = ipv6_hdr(skb);
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__wsum diff;
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switch (ip6h->nexthdr) {
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case NEXTHDR_TCP:
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if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) {
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struct tcphdr *th = (struct tcphdr *)
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(skb_network_header(skb) + nhoff);
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diff = get_csum_diff(ip6h, p);
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inet_proto_csum_replace_by_diff(&th->check, skb,
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diff, true);
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}
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break;
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case NEXTHDR_UDP:
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if (likely(pskb_may_pull(skb, nhoff + sizeof(struct udphdr)))) {
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struct udphdr *uh = (struct udphdr *)
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(skb_network_header(skb) + nhoff);
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if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
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diff = get_csum_diff(ip6h, p);
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inet_proto_csum_replace_by_diff(&uh->check, skb,
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diff, true);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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}
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}
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break;
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case NEXTHDR_ICMP:
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if (likely(pskb_may_pull(skb,
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nhoff + sizeof(struct icmp6hdr)))) {
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struct icmp6hdr *ih = (struct icmp6hdr *)
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(skb_network_header(skb) + nhoff);
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diff = get_csum_diff(ip6h, p);
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inet_proto_csum_replace_by_diff(&ih->icmp6_cksum, skb,
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diff, true);
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}
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break;
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}
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}
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void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
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bool sir2ila)
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{
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struct ipv6hdr *ip6h = ipv6_hdr(skb);
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struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
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switch (p->csum_mode) {
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case ILA_CSUM_ADJUST_TRANSPORT:
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ila_csum_adjust_transport(skb, p);
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break;
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case ILA_CSUM_NEUTRAL_MAP:
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if (sir2ila) {
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if (WARN_ON(ila_csum_neutral_set(iaddr->ident))) {
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/* Checksum flag should never be
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* set in a formatted SIR address.
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*/
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break;
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}
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} else if (!ila_csum_neutral_set(iaddr->ident)) {
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/* ILA to SIR translation and C-bit isn't
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* set so we're good.
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*/
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break;
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}
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ila_csum_do_neutral_fmt(iaddr, p);
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break;
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case ILA_CSUM_NEUTRAL_MAP_AUTO:
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ila_csum_do_neutral_nofmt(iaddr, p);
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break;
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case ILA_CSUM_NO_ACTION:
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break;
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}
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/* Now change destination address */
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iaddr->loc = p->locator;
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}
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