inet: add RCU protection to inet->opt

We lack proper synchronization to manipulate inet->opt ip_options

Problem is ip_make_skb() calls ip_setup_cork() and
ip_setup_cork() possibly makes a copy of ipc->opt (struct ip_options),
without any protection against another thread manipulating inet->opt.

Another thread can change inet->opt pointer and free old one under us.

Use RCU to protect inet->opt (changed to inet->inet_opt).

Instead of handling atomic refcounts, just copy ip_options when
necessary, to avoid cache line dirtying.

We cant insert an rcu_head in struct ip_options since its included in
skb->cb[], so this patch is large because I had to introduce a new
ip_options_rcu structure.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def,
				const struct netlbl_lsm_secattr *secattr,
				unsigned char *buffer,
				u32 buffer_len)
{
	int ret_val;
	u32 tag_len;
	u32 level;

	if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
		return -EPERM;

	ret_val = cipso_v4_map_lvl_hton(doi_def,
					secattr->attr.mls.lvl,
					&level);
	if (ret_val != 0)
		return ret_val;

	if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
		ret_val = cipso_v4_map_cat_enum_hton(doi_def,
						     secattr,
						     &buffer[4],
						     buffer_len - 4);
		if (ret_val < 0)
			return ret_val;

		tag_len = 4 + ret_val;
	} else
		tag_len = 4;

	buffer[0] = CIPSO_V4_TAG_ENUM;
	buffer[1] = tag_len;
	buffer[3] = level;

	return tag_len;
}

static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def,
				const struct netlbl_lsm_secattr *secattr,
				unsigned char *buffer,
				u32 buffer_len)
{
	int ret_val;
	u32 tag_len;
	u32 level;

	if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL))
		return -EPERM;

	ret_val = cipso_v4_map_lvl_hton(doi_def,
					secattr->attr.mls.lvl,
					&level);
	if (ret_val != 0)
		return ret_val;

	if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
		ret_val = cipso_v4_map_cat_enum_hton(doi_def,
						     secattr,
						     &buffer[4],
						     buffer_len - 4);
		if (ret_val < 0)
			return ret_val;

		tag_len = 4 + ret_val;
	} else
		tag_len = 4;

	buffer[0] = CIPSO_V4_TAG_ENUM;
	buffer[1] = tag_len;
	buffer[3] = level;

	return tag_len;
}
