[PATCH v3 3/6] linux-user: netlink: Add IP_PKTINFO cmsg parsing

[deller@kernel.org]

From: Helge Deller <deller@gmx.de>

Fixes those warnings:
 Unsupported host ancillary data: 0/8

Signed-off-by: Helge Deller <deller@gmx.de>

v2: (based on feedback by Laurent Vivier)
- add target_in_pktinfo struct and fix copying target_in_addr fields
---
 linux-user/syscall.c      | 10 ++++++++++
 linux-user/syscall_defs.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index a157abc40c..df8609b4d8 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1998,6 +1998,16 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh,
                     (void *) &errh->offender, sizeof(errh->offender));
                 break;
             }
+            case IP_PKTINFO:
+            {
+                struct in_pktinfo *pkti = data;
+                struct target_in_pktinfo *target_pi = target_data;
+
+                __put_user(pkti->ipi_ifindex, &target_pi->ipi_ifindex);
+                target_pi->ipi_spec_dst.s_addr = pkti->ipi_spec_dst.s_addr;
+                target_pi->ipi_addr.s_addr = pkti->ipi_addr.s_addr;
+                break;
+            }
             default:
                 goto unimplemented;
             }
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index faad9147c9..86d773add7 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2622,6 +2622,12 @@ struct target_ucred {
     abi_uint gid;
 };
 
+struct target_in_pktinfo {
+    abi_int               ipi_ifindex;
+    struct target_in_addr ipi_spec_dst;
+    struct target_in_addr ipi_addr;
+};
+
 typedef abi_int target_timer_t;
 
 #define TARGET_SIGEV_MAX_SIZE 64
-- 
2.47.0