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[posix] disable addrconf generating LL address (#8749)

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This commit disables addrconf generating address by set addr_gen_mode to
IN6_ADDR_GEN_MODE_NONE, otherwise linux may generate a link local address
based on link type and presence of EUI64 address. This allows OpenThread
to fully manage link local address of its network interface.
This commit is contained in:
Yakun Xu
2023-02-13 22:01:43 -08:00
committed by GitHub
parent 27e56b301b
commit 4d14dad95d
1 changed files with 55 additions and 1 deletions
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src/posix/platform/netif.cpp
+55 -1
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@@ -72,6 +72,7 @@
#include <fcntl.h>
#include <ifaddrs.h>
#ifdef __linux__
#include <linux/if_link.h>
#include <linux/if_tun.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
@@ -330,7 +331,11 @@ static uint8_t NetmaskToPrefixLength(const struct sockaddr_in6 *netmask)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
void AddRtAttr(struct nlmsghdr *aHeader, uint32_t aMaxLen, uint8_t aType, const void *aData, uint8_t aLen)
static struct rtattr *AddRtAttr(struct nlmsghdr *aHeader,
uint32_t aMaxLen,
uint8_t aType,
const void *aData,
uint8_t aLen)
{
uint8_t len = RTA_LENGTH(aLen);
struct rtattr *rta;
@@ -346,6 +351,8 @@ void AddRtAttr(struct nlmsghdr *aHeader, uint32_t aMaxLen, uint8_t aType, const
memcpy(RTA_DATA(rta), aData, aLen);
}
aHeader->nlmsg_len = NLMSG_ALIGN(aHeader->nlmsg_len) + RTA_ALIGN(len);
return rta;
}
void AddRtAttrUint32(struct nlmsghdr *aHeader, uint32_t aMaxLen, uint8_t aType, uint32_t aData)
@@ -1631,6 +1638,49 @@ exit:
#endif
#if defined(__linux__)
static void SetAddrGenModeToNone(void)
{
struct
{
struct nlmsghdr nh;
struct ifinfomsg ifi;
char buf[512];
} req;
const enum in6_addr_gen_mode mode = IN6_ADDR_GEN_MODE_NONE;
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.nh.nlmsg_type = RTM_NEWLINK;
req.nh.nlmsg_pid = 0;
req.nh.nlmsg_seq = ++sNetlinkSequence;
req.ifi.ifi_index = static_cast<int>(gNetifIndex);
req.ifi.ifi_change = 0xffffffff;
req.ifi.ifi_flags = IFF_MULTICAST | IFF_NOARP;
{
struct rtattr *afSpec = AddRtAttr(&req.nh, sizeof(req), IFLA_AF_SPEC, 0, 0);
struct rtattr *afInet6 = AddRtAttr(&req.nh, sizeof(req), AF_INET6, 0, 0);
struct rtattr *inet6AddrGenMode =
AddRtAttr(&req.nh, sizeof(req), IFLA_INET6_ADDR_GEN_MODE, &mode, sizeof(mode));
afInet6->rta_len += inet6AddrGenMode->rta_len;
afSpec->rta_len += afInet6->rta_len;
}
if (send(sNetlinkFd, &req, req.nh.nlmsg_len, 0) != -1)
{
otLogInfoPlat("[netif] Sent request#%u to set addr_gen_mode to %d", sNetlinkSequence, mode);
}
else
{
otLogWarnPlat("[netif] Failed to send request#%u to set addr_gen_mode to %d", sNetlinkSequence, mode);
}
}
// set up the tun device
static void platformConfigureTunDevice(otPlatformConfig *aPlatformConfig)
{
@@ -1824,6 +1874,10 @@ void platformNetifInit(otPlatformConfig *aPlatformConfig)
#if OPENTHREAD_POSIX_USE_MLD_MONITOR
mldListenerInit();
#endif
#if __linux__
SetAddrGenModeToNone();
#endif
}
void platformNetifSetUp(void)