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/*
* Copyright (c) 2019 Ant Financial Services Group.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _TLE_GATEWAY_H_
#define _TLE_GATEWAY_H_
#ifdef __cplusplus
extern "C" {
#endif
static inline bool
is_ipv4_loopback_addr(in_addr_t addr, struct glue_ctx *ctx)
{
if (addr == ctx->ipv4 || addr == htonl(INADDR_LOOPBACK))
return true;
else
return false;
}
static inline bool
is_ipv6_loopback_addr(const struct in6_addr *addr, struct glue_ctx *ctx)
{
if (memcmp(addr, &ctx->ipv6, sizeof(struct in6_addr)) == 0 ||
IN6_IS_ADDR_LOOPBACK(addr) ||
(IN6_IS_ADDR_V4COMPAT(addr) &&
addr->__in6_u.__u6_addr32[3] == htonl(INADDR_LOOPBACK)) ||
(IN6_IS_ADDR_V4MAPPED(addr) &&
addr->__in6_u.__u6_addr32[3] == htonl(INADDR_LOOPBACK)))
return true;
else
return false;
}
static inline const struct in_addr *
ipv4_gateway_lookup(void *data, const struct in_addr *addr)
{
uint8_t ls;
struct glue_ctx *ctx = data;
if (is_ipv4_loopback_addr(addr->s_addr, ctx))
return addr;
ls = 32 - ctx->ipv4_ml;
if ((addr->s_addr << ls) == (ctx->ipv4 << ls))
return addr;
if (ctx->ipv4_gw.s_addr != 0)
return &ctx->ipv4_gw;
return addr;
}
static inline const struct in6_addr *
ipv6_gateway_lookup(void *data, const struct in6_addr *addr)
{
uint8_t ls;
struct glue_ctx *ctx = data;
if (is_ipv6_loopback_addr(addr, ctx))
return addr;
if (ctx->ipv6_ml <= 64) {
ls = 64 - ctx->ipv6_ml;
if ((*(const uint64_t*)addr << ls) ==
(*(const uint64_t*)&ctx->ipv6 << ls))
return addr;
} else if (*(const uint64_t*)addr == *(const uint64_t*)&ctx->ipv6) {
ls = 128 - ctx->ipv6_ml;
if ((*((const uint64_t*)addr + 1) << ls) ==
(*((const uint64_t*)&ctx->ipv6 + 1) << ls))
return addr;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&ctx->ipv6_gw))
return &ctx->ipv6_gw;
return addr;
}
#ifdef __cplusplus
}
#endif
#endif /* _TLE_GATEWAY_H_ */
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