diff options
Diffstat (limited to 'crypto/bio/bss_dgram.c')
| -rw-r--r-- | crypto/bio/bss_dgram.c | 46 |
1 files changed, 42 insertions, 4 deletions
diff --git a/crypto/bio/bss_dgram.c b/crypto/bio/bss_dgram.c index 8cad5b41db..7bed08e9b4 100644 --- a/crypto/bio/bss_dgram.c +++ b/crypto/bio/bss_dgram.c @@ -454,6 +454,36 @@ static int dgram_write(BIO *b, const char *in, int inl) return(ret); } +static long dgram_get_mtu_overhead(bio_dgram_data *data) + { + long ret; + + switch (data->peer.sa.sa_family) + { + case AF_INET: + /* Assume this is UDP - 20 bytes for IP, 8 bytes for UDP */ + ret = 28; + break; +#if OPENSSL_USE_IPV6 + case AF_INET6: +#ifdef IN6_IS_ADDR_V4MAPPED + if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr)) + /* Assume this is UDP - 20 bytes for IP, 8 bytes for UDP */ + ret = 28; + else +#endif + /* Assume this is UDP - 40 bytes for IP, 8 bytes for UDP */ + ret = 48; + break; +#endif + default: + /* We don't know. Go with the historical default */ + ret = 28; + break; + } + return ret; + } + static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr) { long ret=1; @@ -630,23 +660,24 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr) #endif break; case BIO_CTRL_DGRAM_GET_FALLBACK_MTU: + ret = -dgram_get_mtu_overhead(data); switch (data->peer.sa.sa_family) { case AF_INET: - ret = 576 - 20 - 8; + ret += 576; break; #if OPENSSL_USE_IPV6 case AF_INET6: #ifdef IN6_IS_ADDR_V4MAPPED if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr)) - ret = 576 - 20 - 8; + ret += 576; else #endif - ret = 1280 - 40 - 8; + ret += 1280; break; #endif default: - ret = 576 - 20 - 8; + ret += 576; break; } break; @@ -847,6 +878,9 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr) ret = 0; break; #endif + case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD: + ret = dgram_get_mtu_overhead(data); + break; default: ret=0; break; @@ -1367,6 +1401,10 @@ static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr) * Returns always 1. */ break; + case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD: + /* We allow transport protocol fragmentation so this is irrelevant */ + ret = 0; + break; case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE: if (num > 0) data->in_handshake = 1; |