[Qemu-devel] [PATCH v5] Add getsockopt for settable SOL_IPV6 options

[tom.deseyn@gmail.com]

From: Tom Deseyn <tom.deseyn@gmail.com>

v2: default to unimplemented
v3: match kernel behavior
v4: braces code-style
v5: pointer code-style

Signed-off-by: Tom Deseyn <tom.deseyn@gmail.com>
---
 linux-user/syscall.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 280137da8c..a6f6e9c1f7 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -2352,6 +2352,47 @@ static abi_long do_getsockopt(int sockfd, int level, int optname,
             break;
         }
         break;
+    case SOL_IPV6:
+        switch (optname) {
+        case IPV6_MTU_DISCOVER:
+        case IPV6_MTU:
+        case IPV6_V6ONLY:
+        case IPV6_RECVPKTINFO:
+        case IPV6_UNICAST_HOPS:
+        case IPV6_MULTICAST_HOPS:
+        case IPV6_MULTICAST_LOOP:
+        case IPV6_RECVERR:
+        case IPV6_RECVHOPLIMIT:
+        case IPV6_2292HOPLIMIT:
+        case IPV6_CHECKSUM: {
+            void *target_addr;
+            if (get_user_u32(len, optlen)) {
+                return -TARGET_EFAULT;
+            }
+            if (len < 0) {
+                return -TARGET_EINVAL;
+            }
+            lv = sizeof(val);
+            ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
+            if (ret < 0) {
+                return ret;
+            }
+            if (lv < len) {
+                len = lv;
+            }
+            if (put_user_u32(len, optlen)) {
+                return -TARGET_EFAULT;
+            }
+            target_addr = lock_user(VERIFY_WRITE, optval_addr, len, 0);
+            tswap32s((uint32_t *)&val);
+            memcpy(target_addr, &val, len);
+            unlock_user(target_addr, optval_addr, len);
+            break;
+        }
+        default:
+            goto unimplemented;
+        }
+        break;
     default:
     unimplemented:
         gemu_log("getsockopt level=%d optname=%d not yet supported\n",
-- 
2.19.2