[5/6] linux-user: netlink: add netlink neighbour emulation

Commit Message

Helge Deller Nov. 29, 2024, 2:39 p.m. UTC

From: Helge Deller <[e-mail]>

Fixes various warnings in the testsuite while building gupnp:
 gssdp-net-DEBUG: Failed to send netlink message: Operation not supported
 gupnp-context-DEBUG: Mismatch between host header and host IP (example.com, expected: 127.0.0.1)
 gupnp-context-DEBUG: Mismatch between host header and host port (80, expected 4711)
 gupnp-context-DEBUG: Mismatch between host header and host IP (192.168.1.2, expected: 127.0.0.1)
 gupnp-context-DEBUG: Mismatch between host header and host IP (fe80::01, expected: 127.0.0.1)
 gupnp-context-DEBUG: Mismatch between host header and host port (80, expected 4711)
 gupnp-context-DEBUG: Failed to parse HOST header from request: Invalid IPv6 address ?[fe80::01%1]? in URI
 gupnp-context-DEBUG: Failed to parse HOST header from request: Invalid IPv6 address ?[fe80::01%eth0]? in URI
 gupnp-context-DEBUG: Failed to parse HOST header from request: Could not parse port ?:1? in URI
 gupnp-context-DEBUG: Mismatch between host header and host IP (example.com, expected: ::1)
 gupnp-context-DEBUG: Mismatch between host header and host port (80, expected 4711)
 gupnp-context-DEBUG: Mismatch between host header and host IP (example.com, expected: ::1)
 gupnp-context-DEBUG: Mismatch between host header and host port (80, expected 4711)
 gupnp-context-DEBUG: Mismatch between host header and host IP (example.com, expected: ::1)

Signed-off-by: Helge Deller <[e-mail]>
---
 linux-user/fd-trans.c | 100 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)

Patch

diff --git a/linux-user/fd-trans.c b/linux-user/fd-trans.c
index 6191e3115b..e861572a35 100644
--- a/linux-user/fd-trans.c
+++ b/linux-user/fd-trans.c
@@ -25,12 +25,16 @@ 
 #ifdef CONFIG_RTNETLINK
 #include <linux/rtnetlink.h>
 #include <linux/if_bridge.h>
+#include <linux/neighbour.h>
 #endif
 #include "qemu.h"
 #include "user-internals.h"
 #include "fd-trans.h"
 #include "signal-common.h"
 
+#define NDM_RTA(r)  ((struct rtattr*)(((char*)(r)) + \
+                    NLMSG_ALIGN(sizeof(struct ndmsg))))
+
 enum {
     QEMU_IFLA_BR_UNSPEC,
     QEMU_IFLA_BR_FORWARD_DELAY,
@@ -1210,6 +1214,35 @@  static abi_long host_to_target_data_route_rtattr(struct rtattr *rtattr)
     return 0;
 }
 
+static abi_long host_to_target_data_neigh_rtattr(struct rtattr *rtattr)
+{
+    struct nda_cacheinfo *ndac;
+    uint32_t *u32;
+
+    switch (rtattr->rta_type) {
+    case NDA_UNSPEC:
+    case NDA_DST:
+    case NDA_LLADDR:
+        break;
+    case NDA_PROBES:
+        u32 = RTA_DATA(rtattr);
+        *u32 = tswap32(*u32);
+        break;
+    case NDA_CACHEINFO:
+        ndac = RTA_DATA(rtattr);
+        ndac->ndm_confirmed = tswap32(ndac->ndm_confirmed);
+        ndac->ndm_used      = tswap32(ndac->ndm_used);
+        ndac->ndm_updated   = tswap32(ndac->ndm_updated);
+        ndac->ndm_refcnt    = tswap32(ndac->ndm_refcnt);
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP, "Unknown host to target NEIGH type: %d\n",
+                      rtattr->rta_type);
+        break;
+    }
+    return 0;
+}
+
 static abi_long host_to_target_link_rtattr(struct rtattr *rtattr,
                                          uint32_t rtattr_len)
 {
@@ -1231,12 +1264,20 @@  static abi_long host_to_target_route_rtattr(struct rtattr *rtattr,
                                           host_to_target_data_route_rtattr);
 }
 
+static abi_long host_to_target_neigh_rtattr(struct rtattr *rtattr,
+                                         uint32_t rtattr_len)
+{
+    return host_to_target_for_each_rtattr(rtattr, rtattr_len,
+                                          host_to_target_data_neigh_rtattr);
+}
+
 static abi_long host_to_target_data_route(struct nlmsghdr *nlh)
 {
     uint32_t nlmsg_len;
     struct ifinfomsg *ifi;
     struct ifaddrmsg *ifa;
     struct rtmsg *rtm;
+    struct ndmsg *ndm;
 
     nlmsg_len = nlh->nlmsg_len;
     switch (nlh->nlmsg_type) {
@@ -1263,6 +1304,17 @@  static abi_long host_to_target_data_route(struct nlmsghdr *nlh)
                                        nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
         }
         break;
+    case RTM_NEWNEIGH:
+    case RTM_DELNEIGH:
+    case RTM_GETNEIGH:
+        if (nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(*ndm))) {
+            ndm = NLMSG_DATA(nlh);
+            ndm->ndm_ifindex = tswap32(ndm->ndm_ifindex);
+            ndm->ndm_state = tswap16(ndm->ndm_state);
+            host_to_target_neigh_rtattr(NDM_RTA(ndm),
+                                    nlmsg_len - NLMSG_LENGTH(sizeof(*ndm)));
+        }
+        break;
     case RTM_NEWROUTE:
     case RTM_DELROUTE:
     case RTM_GETROUTE:
@@ -1410,6 +1462,35 @@  static abi_long target_to_host_data_addr_rtattr(struct rtattr *rtattr)
     return 0;
 }
 
+static abi_long target_to_host_data_neigh_rtattr(struct rtattr *rtattr)
+{
+    struct nda_cacheinfo *ndac;
+    uint32_t *u32;
+
+    switch (rtattr->rta_type) {
+    case NDA_UNSPEC:
+    case NDA_DST:
+    case NDA_LLADDR:
+        break;
+    case NDA_PROBES:
+        u32 = RTA_DATA(rtattr);
+        *u32 = tswap32(*u32);
+        break;
+    case NDA_CACHEINFO:
+        ndac = RTA_DATA(rtattr);
+        ndac->ndm_confirmed = tswap32(ndac->ndm_confirmed);
+        ndac->ndm_used      = tswap32(ndac->ndm_used);
+        ndac->ndm_updated   = tswap32(ndac->ndm_updated);
+        ndac->ndm_refcnt    = tswap32(ndac->ndm_refcnt);
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP, "Unknown target NEIGH type: %d\n",
+                      rtattr->rta_type);
+        break;
+    }
+    return 0;
+}
+
 static abi_long target_to_host_data_route_rtattr(struct rtattr *rtattr)
 {
     uint32_t *u32;
@@ -1448,6 +1529,13 @@  static void target_to_host_addr_rtattr(struct rtattr *rtattr,
                                    target_to_host_data_addr_rtattr);
 }
 
+static void target_to_host_neigh_rtattr(struct rtattr *rtattr,
+                                     uint32_t rtattr_len)
+{
+    target_to_host_for_each_rtattr(rtattr, rtattr_len,
+                                   target_to_host_data_neigh_rtattr);
+}
+
 static void target_to_host_route_rtattr(struct rtattr *rtattr,
                                      uint32_t rtattr_len)
 {
@@ -1460,6 +1548,7 @@  static abi_long target_to_host_data_route(struct nlmsghdr *nlh)
     struct ifinfomsg *ifi;
     struct ifaddrmsg *ifa;
     struct rtmsg *rtm;
+    struct ndmsg *ndm;
 
     switch (nlh->nlmsg_type) {
     case RTM_NEWLINK:
@@ -1486,6 +1575,17 @@  static abi_long target_to_host_data_route(struct nlmsghdr *nlh)
                                        NLMSG_LENGTH(sizeof(*ifa)));
         }
         break;
+    case RTM_NEWNEIGH:
+    case RTM_DELNEIGH:
+    case RTM_GETNEIGH:
+        if (nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(*ndm))) {
+            ndm = NLMSG_DATA(nlh);
+            ndm->ndm_ifindex = tswap32(ndm->ndm_ifindex);
+            ndm->ndm_state = tswap16(ndm->ndm_state);
+            target_to_host_neigh_rtattr(NDM_RTA(ndm), nlh->nlmsg_len -
+                                       NLMSG_LENGTH(sizeof(*ndm)));
+        }
+        break;
     case RTM_NEWROUTE:
     case RTM_DELROUTE:
     case RTM_GETROUTE: