示例#1
0
static void ila_csum_do_neutral(struct ila_addr *iaddr,
				struct ila_params *p)
{
	__sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
	__wsum diff, fval;

	/* Check if checksum adjust value has been cached */
	if (p->locator_match.v64) {
		diff = p->csum_diff;
	} else {
		diff = compute_csum_diff8((__be32 *)iaddr,
					  (__be32 *)&p->locator);
	}

	fval = (__force __wsum)(ila_csum_neutral_set(iaddr->ident) ?
			~CSUM_NEUTRAL_FLAG : CSUM_NEUTRAL_FLAG);

	diff = csum_add(diff, fval);

	*adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));

	/* Flip the csum-neutral bit. Either we are doing a SIR->ILA
	 * translation with ILA_CSUM_NEUTRAL_MAP as the csum_method
	 * and the C-bit is not set, or we are doing an ILA-SIR
	 * tranlsation and the C-bit is set.
	 */
	iaddr->ident.csum_neutral ^= 1;
}
示例#2
0
void ila_init_saved_csum(struct ila_params *p)
{
	if (!p->locator_match.v64)
		return;

	p->csum_diff = compute_csum_diff8(
				(__be32 *)&p->locator_match,
				(__be32 *)&p->locator);
}
示例#3
0
static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
{
	struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);

	if (p->locator_match.v64)
		return p->csum_diff;
	else
		return compute_csum_diff8((__be32 *)&iaddr->loc,
					  (__be32 *)&p->locator);
}
示例#4
0
文件: ila_lwt.c 项目: mdamt/linux
static int ila_build_state(struct nlattr *nla,
			   unsigned int family, const void *cfg,
			   struct lwtunnel_state **ts,
			   struct netlink_ext_ack *extack)
{
	struct ila_lwt *ilwt;
	struct ila_params *p;
	struct nlattr *tb[ILA_ATTR_MAX + 1];
	struct lwtunnel_state *newts;
	const struct fib6_config *cfg6 = cfg;
	struct ila_addr *iaddr;
	int ret;

	if (family != AF_INET6)
		return -EINVAL;

	if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
		/* Need to have full locator and at least type field
		 * included in destination
		 */
		return -EINVAL;
	}

	iaddr = (struct ila_addr *)&cfg6->fc_dst;

	if (!ila_addr_is_ila(iaddr) || ila_csum_neutral_set(iaddr->ident)) {
		/* Don't allow translation for a non-ILA address or checksum
		 * neutral flag to be set.
		 */
		return -EINVAL;
	}

	ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, extack);
	if (ret < 0)
		return ret;

	if (!tb[ILA_ATTR_LOCATOR])
		return -EINVAL;

	newts = lwtunnel_state_alloc(sizeof(*ilwt));
	if (!newts)
		return -ENOMEM;

	ilwt = ila_lwt_lwtunnel(newts);
	ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
	if (ret) {
		kfree(newts);
		return ret;
	}

	p = ila_params_lwtunnel(newts);

	p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);

	/* Precompute checksum difference for translation since we
	 * know both the old locator and the new one.
	 */
	p->locator_match = iaddr->loc;
	p->csum_diff = compute_csum_diff8(
		(__be32 *)&p->locator_match, (__be32 *)&p->locator);

	if (tb[ILA_ATTR_CSUM_MODE])
		p->csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);

	ila_init_saved_csum(p);

	newts->type = LWTUNNEL_ENCAP_ILA;
	newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
			LWTUNNEL_STATE_INPUT_REDIRECT;

	if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
		ilwt->connected = 1;

	*ts = newts;

	return 0;
}