libnetdevice: Add prefixlen option to setAddr4
Bug: 310710841
Test: m
Change-Id: I0db4427b426a02a86ed5e1d4161d8254f8207cde
diff --git a/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp b/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
index 1830633..9bb1a57 100644
--- a/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
+++ b/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
@@ -93,14 +93,31 @@
return addrn;
}
-bool setAddr4(std::string_view ifname, std::string_view addr) {
- auto ifr = ifreqs::fromName(ifname);
+static in_addr_t prefixLengthToIpv4Netmask(uint8_t prefixlen) {
+ in_addr_t zero = 0;
+ return htonl(~zero << (32 - prefixlen));
+}
- struct sockaddr_in* ifrAddr = reinterpret_cast<sockaddr_in*>(&ifr.ifr_addr);
+bool setAddr4(std::string_view ifname, std::string_view addr, std::optional<uint8_t> prefixlen) {
+ auto ifr = ifreqs::fromName(ifname);
+ auto ifrAddr = reinterpret_cast<sockaddr_in*>(&ifr.ifr_addr);
ifrAddr->sin_family = AF_INET;
ifrAddr->sin_addr.s_addr = inetAddr(addr);
+ if (!ifreqs::send(SIOCSIFADDR, ifr)) return false;
- return ifreqs::send(SIOCSIFADDR, ifr);
+ if (prefixlen.has_value()) {
+ if (*prefixlen < 0 || *prefixlen > 32) {
+ LOG(ERROR) << "Invalid prefix length: " << *prefixlen;
+ return false;
+ }
+ ifr = ifreqs::fromName(ifname);
+ auto ifrNetmask = reinterpret_cast<sockaddr_in*>(&ifr.ifr_netmask);
+ ifrNetmask->sin_family = AF_INET;
+ ifrNetmask->sin_addr.s_addr = prefixLengthToIpv4Netmask(*prefixlen);
+ if (!ifreqs::send(SIOCSIFNETMASK, ifr)) return false;
+ }
+
+ return true;
}
bool addAddr4(std::string_view ifname, std::string_view addr, uint8_t prefixlen) {