linux-user: handle AF_PACKET sockaddrs in target_to_host_sockaddr

Implement conversion of the AF_PACKET sockaddr subtype
in target_to_host_sockaddr.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index dcf1323..7163ade 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1140,6 +1140,13 @@
 
     memcpy(addr, target_saddr, len);
     addr->sa_family = sa_family;
+    if (sa_family == AF_PACKET) {
+	struct target_sockaddr_ll *lladdr;
+
+	lladdr = (struct target_sockaddr_ll *)addr;
+	lladdr->sll_ifindex = tswap32(lladdr->sll_ifindex);
+	lladdr->sll_hatype = tswap16(lladdr->sll_hatype);
+    }
     unlock_user(target_saddr, target_addr, 0);
 
     return 0;

linux-user/syscall_defs.h

diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 8563027..c9e6323 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -121,6 +121,16 @@
     uint8_t sa_data[14];
 };
 
+struct target_sockaddr_ll {
+    uint16_t sll_family;   /* Always AF_PACKET */
+    uint16_t sll_protocol; /* Physical layer protocol */
+    int      sll_ifindex;  /* Interface number */
+    uint16_t sll_hatype;   /* ARP hardware type */
+    uint8_t  sll_pkttype;  /* Packet type */
+    uint8_t  sll_halen;    /* Length of address */
+    uint8_t  sll_addr[8];  /* Physical layer address */
+};
+
 struct target_sock_filter {
     abi_ushort code;
     uint8_t jt;