diff options
| author | Eric <ewild@sysmocom.de> | 2021-09-27 22:10:01 +0200 |
|---|---|---|
| committer | Hoernchen <ewild@sysmocom.de> | 2021-10-06 13:01:26 +0000 |
| commit | 8ae40cbb9186729202068f83576efd025450fd5e (patch) | |
| tree | efb8d97b445f79f850d89420d75e415eff27aaa2 | |
| parent | 6dce2cbc1e53e9f25b1fa9201cb812949f540096 (diff) | |
gsmtap: allow 127.0.0.x local listeners
Even if not bound to a IF they just exist and work as expected, and make
distinguishing traffic for local setups easy.
Change-Id: I1043dfd8075f14481011f43db45c943e9320413c
| -rw-r--r-- | src/socket.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/socket.c b/src/socket.c index 19d48e4f..45b0f5b7 100644 --- a/src/socket.c +++ b/src/socket.c @@ -1129,6 +1129,25 @@ static int sockaddr_equal(const struct sockaddr *a, return 0; } +/* linux has a default route: +local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 +*/ +static int sockaddr_is_local_routed(const struct sockaddr *a) +{ +#if __linux__ + if (a->sa_family != AF_INET) + return 0; + + uint32_t address = ((struct sockaddr_in *)a)->sin_addr.s_addr; /* already BE */ + uint32_t eightmask = htonl(0xff000000); /* /8 mask */ + uint32_t local_prefix_127 = htonl(0x7f000000); /* 127.0.0.0 */ + + if ((address & eightmask) == local_prefix_127) + return 1; +#endif + return 0; +} + /*! Determine if the given address is a local address * \param[in] addr Socket Address * \param[in] addrlen Length of socket address in bytes @@ -1138,6 +1157,9 @@ int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen) { struct ifaddrs *ifaddr, *ifa; + if (sockaddr_is_local_routed(addr)) + return 1; + if (getifaddrs(&ifaddr) == -1) { LOGP(DLGLOBAL, LOGL_ERROR, "getifaddrs:" " %s\n", strerror(errno)); |