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authorLaurent Vivier <laurent@vivier.eu>2015-10-28 21:40:45 +0100
committerRiku Voipio <riku.voipio@linaro.org>2016-01-08 15:20:15 +0200
commit0cf227229bfd288a67fd9d4005ee01ffdb492c70 (patch)
tree4477c2d229a3fb89acdf810657df3ca02194d5c8 /linux-user
parent7b36f78274e701ee17db3171ec7e9f732a60f031 (diff)
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linux-user: manage bind with a socket of SOCK_PACKET type.
This is obsolete, but if we want to use dhcp with an old distro (like debian etch), we need it. Some users (like dhclient) use SOCK_PACKET with AF_PACKET and the kernel allows that. packet(7) In Linux 2.0, the only way to get a packet socket was by calling socket(AF_INET, SOCK_PACKET, protocol). This is still supported but strongly deprecated. The main difference between the two methods is that SOCK_PACKET uses the old struct sockaddr_pkt to specify an inter‐ face, which doesn't provide physical layer independence. struct sockaddr_pkt { unsigned short spkt_family; unsigned char spkt_device[14]; unsigned short spkt_protocol; }; spkt_family contains the device type, spkt_protocol is the IEEE 802.3 protocol type as defined in <sys/if_ether.h> and spkt_device is the device name as a null-terminated string, for example, eth0. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 3484132..94d64fa 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -2090,6 +2090,30 @@ static int sock_flags_fixup(int fd, int target_type)
return fd;
}
+static abi_long packet_target_to_host_sockaddr(void *host_addr,
+ abi_ulong target_addr,
+ socklen_t len)
+{
+ struct sockaddr *addr = host_addr;
+ struct target_sockaddr *target_saddr;
+
+ target_saddr = lock_user(VERIFY_READ, target_addr, len, 1);
+ if (!target_saddr) {
+ return -TARGET_EFAULT;
+ }
+
+ memcpy(addr, target_saddr, len);
+ addr->sa_family = tswap16(target_saddr->sa_family);
+ /* spkt_protocol is big-endian */
+
+ unlock_user(target_saddr, target_addr, 0);
+ return 0;
+}
+
+static TargetFdTrans target_packet_trans = {
+ .target_to_host_addr = packet_target_to_host_sockaddr,
+};
+
/* do_socket() Must return target values and target errnos. */
static abi_long do_socket(int domain, int type, int protocol)
{
@@ -2112,6 +2136,12 @@ static abi_long do_socket(int domain, int type, int protocol)
ret = get_errno(socket(domain, type, protocol));
if (ret >= 0) {
ret = sock_flags_fixup(ret, target_type);
+ if (type == SOCK_PACKET) {
+ /* Manage an obsolete case :
+ * if socket type is SOCK_PACKET, bind by name
+ */
+ fd_trans_register(ret, &target_packet_trans);
+ }
}
return ret;
}