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tun-device: Fix setting IPv6 address on Linux

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Unlike `struct ifreq` that's used for IPv4, `struct in6_ifreq` contains
not a `struct sockaddr[_in6]` but only a `struct in6_addr`.

Setting addresses like this is currently not used on Linux (the feature
was added to install virtual IPs on FreeBSD/macOS).

Fixes: fccc76449d ("tun-device: Fix handling of IPv6 addresses")
This commit is contained in:
Tobias Brunner
2026-05-19 17:27:33 +02:00
parent 7bdd4bf77b
commit ea569867d2
1 changed files with 3 additions and 2 deletions
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src/libstrongswan/networking/tun_device.c
+3 -2
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@@ -159,6 +159,7 @@ static bool set_address_v4(private_tun_device_t *this, host_t *addr,
static bool set_address_v6(private_tun_device_t *this, host_t *addr,
uint8_t netmask)
{
struct sockaddr_in6 *sin6;
struct in6_ifreq ifr6 = {0};
struct ifreq ifr = {0};
@@ -170,8 +171,8 @@ static bool set_address_v6(private_tun_device_t *this, host_t *addr,
return FALSE;
}
memcpy(&ifr6.ifr6_addr, addr->get_sockaddr(addr),
*addr->get_sockaddr_len(addr));
sin6 = (struct sockaddr_in6*)addr->get_sockaddr(addr);
memcpy(&ifr6.ifr6_addr, &sin6->sin6_addr, sizeof(ifr6.ifr6_addr));
ifr6.ifr6_prefixlen = netmask;
ifr6.ifr6_ifindex = ifr.ifr_ifindex;
if (ioctl(this->sock_v6, SIOCSIFADDR, &ifr6) < 0)