static const char *
lex_parse_mask(const char *p, struct lex_token *token)
{
struct lex_token mask;
/* Parse just past the '/' as a second integer. Handle errors. */
p = lex_parse_integer__(p + 1, &mask);
if (mask.type == LEX_T_ERROR) {
lex_token_swap(&mask, token);
lex_token_destroy(&mask);
return p;
}
ovs_assert(mask.type == LEX_T_INTEGER);
/* Now convert the value and mask into a masked integer token.
* We have a few special cases. */
token->type = LEX_T_MASKED_INTEGER;
memset(&token->mask, 0, sizeof token->mask);
uint32_t prefix_bits = ntohll(mask.value.integer);
if (token->format == mask.format) {
/* Same format value and mask is always OK. */
token->mask = mask.value;
} else if (token->format == LEX_F_IPV4
&& mask.format == LEX_F_DECIMAL
&& prefix_bits <= 32) {
/* IPv4 address with decimal mask is a CIDR prefix. */
token->mask.integer = htonll(ntohl(be32_prefix_mask(prefix_bits)));
} else if (token->format == LEX_F_IPV6
&& mask.format == LEX_F_DECIMAL
&& prefix_bits <= 128) {
/* IPv6 address with decimal mask is a CIDR prefix. */
token->mask.ipv6 = ipv6_create_mask(prefix_bits);
} else if (token->format == LEX_F_DECIMAL
&& mask.format == LEX_F_HEXADECIMAL
&& token->value.integer == 0) {
/* Special case for e.g. 0/0x1234. */
token->format = LEX_F_HEXADECIMAL;
token->mask = mask.value;
} else {
lex_error(token, "Value and mask have incompatible formats.");
return p;
}
/* Check invariant that a 1-bit in the value corresponds to a 1-bit in the
* mask. */
for (int i = 0; i < ARRAY_SIZE(token->mask.be32); i++) {
ovs_be32 v = token->value.be32[i];
ovs_be32 m = token->mask.be32[i];
if (v & ~m) {
lex_error(token, "Value contains unmasked 1-bits.");
break;
}
}
/* Done! */
lex_token_destroy(&mask);
return p;
}
static void
add_ipv4_netaddr(struct lport_addresses *laddrs, ovs_be32 addr,
unsigned int plen)
{
laddrs->n_ipv4_addrs++;
laddrs->ipv4_addrs = xrealloc(laddrs->ipv4_addrs,
laddrs->n_ipv4_addrs * sizeof *laddrs->ipv4_addrs);
struct ipv4_netaddr *na = &laddrs->ipv4_addrs[laddrs->n_ipv4_addrs - 1];
na->addr = addr;
na->mask = be32_prefix_mask(plen);
na->network = addr & na->mask;
na->plen = plen;
ovs_be32 bcast = addr | ~na->mask;
inet_ntop(AF_INET, &addr, na->addr_s, sizeof na->addr_s);
inet_ntop(AF_INET, &na->network, na->network_s, sizeof na->network_s);
inet_ntop(AF_INET, &bcast, na->bcast_s, sizeof na->bcast_s);
}