musl: fix handling of point-to-point interfaces in getifaddrs()

Current musl reports the peer (remote) address of a point-to-point
interface and does not store the local address at all.

Apply the same special treatment of IFA_LOCAL to musl's getifaddrs() which
is also used in glibc and uclibc.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
SVN-Revision: 47488

diff --git a/toolchain/musl/patches/920-getifaddrs_ptp_fix.patch b/toolchain/musl/patches/920-getifaddrs_ptp_fix.patch
new file mode 100644 (file)
index 0000000..3e65232
--- /dev/null
+++ b/toolchain/musl/patches/920-getifaddrs_ptp_fix.patch
@@ -0,0 +1,18 @@
+--- a/src/network/getifaddrs.c
++++ b/src/network/getifaddrs.c
+@@ -161,6 +161,15 @@ static int netlink_msg_to_ifaddr(void *p
+               ifs->ifa.ifa_flags = ifs0->ifa.ifa_flags;
+               for (rta = NLMSG_RTA(h, sizeof(*ifa)); NLMSG_RTAOK(rta, h); rta = RTA_NEXT(rta)) {
+                       switch (rta->rta_type) {
++                      case IFA_LOCAL:
++                              /* If ifa_addr is set and we get IFA_LOCAL, assume we have
++                               * a point-to-point network. Move address to correct field.  */
++                              if (ifs->ifa.ifa_addr != NULL) {
++                                      ifs->ifu = ifs->addr;
++                                      ifs->ifa.ifa_broadaddr = &ifs->ifu.sa;
++                                      memset(&ifs->addr, 0, sizeof(ifs->addr));
++                              }
++                              /* fall through */
+                       case IFA_ADDRESS:
+                               copy_addr(&ifs->ifa.ifa_addr, ifa->ifa_family, &ifs->addr, RTA_DATA(rta), RTA_DATALEN(rta), ifa->ifa_index);
+                               break;