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zos: add uv_interface_addresses() netmask support (#3640 2/3)

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Use SIOCGIFNETMASK ioctl to retrieve the netmask for IPv4. However, this
approach is not supported for IPv6.

For IPv6 netmask, z/OS currently only provides the prefix length through
the __nif6e_prefixlen in __net_ifconf6entry_t struct, but this can be
used to calculate the IPv6 netmask similar to android implementation.

Co-authored-by: Igor Todorovski <itodorov@ca.ibm.com>
This commit is contained in:
Wayne Zhang 2022-05-17 12:18:54 -04:00 committed by Jameson Nash
parent 75ad046bfb
commit 524c5ed87d
1 changed files with 19 additions and 5 deletions
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24
src/unix/os390.c
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@ -279,6 +279,7 @@ static int uv__interface_addresses_v6(uv_interface_address_t** addresses,
__net_ifconf6entry_t* ifr;
__net_ifconf6entry_t* p;
unsigned int i;
unsigned char netmask[16] = {0};
*count = 0;
/* Assume maximum buffer size allowable */
@ -303,8 +304,7 @@ static int uv__interface_addresses_v6(uv_interface_address_t** addresses,
p = ifr;
ifr = (__net_ifconf6entry_t*)((char*)ifr + ifc.__nif6h_entrylen);
if (!(p->__nif6e_addr.sin6_family == AF_INET6 ||
p->__nif6e_addr.sin6_family == AF_INET))
if (!(p->__nif6e_addr.sin6_family == AF_INET6))
continue;
if (!(p->__nif6e_flags & _NIF6E_FLAGS_ON_LINK_ACTIVE))
@ -326,8 +326,7 @@ static int uv__interface_addresses_v6(uv_interface_address_t** addresses,
p = ifr;
ifr = (__net_ifconf6entry_t*)((char*)ifr + ifc.__nif6h_entrylen);
if (!(p->__nif6e_addr.sin6_family == AF_INET6 ||
p->__nif6e_addr.sin6_family == AF_INET))
if (!(p->__nif6e_addr.sin6_family == AF_INET6))
continue;
if (!(p->__nif6e_flags & _NIF6E_FLAGS_ON_LINK_ACTIVE))
@ -350,7 +349,15 @@ static int uv__interface_addresses_v6(uv_interface_address_t** addresses,
address->address.address6 = *((struct sockaddr_in6*) &p->__nif6e_addr);
/* TODO: Retrieve netmask using SIOCGIFNETMASK ioctl */
for (i = 0; i < (p->__nif6e_prefixlen / 8); i++)
netmask[i] = 0xFF;
if (p->__nif6e_prefixlen % 8)
netmask[i] = 0xFF << (8 - (p->__nif6e_prefixlen % 8));
address->netmask.netmask6.sin6_len = p->__nif6e_prefixlen;
memcpy(&(address->netmask.netmask6.sin6_addr), netmask, 16);
address->netmask.netmask6.sin6_family = AF_INET6;
address->is_internal = p->__nif6e_flags & _NIF6E_FLAGS_LOOPBACK ? 1 : 0;
memset(address->phys_addr, 0, sizeof(address->phys_addr));
@ -479,6 +486,13 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
address->address.address4 = *((struct sockaddr_in*) &p->ifr_addr);
if (ioctl(sockfd, SIOCGIFNETMASK, p) == -1) {
uv__close(sockfd);
return UV__ERR(errno);
}
address->netmask.netmask4 = *((struct sockaddr_in*) &p->ifr_addr);
address->netmask.netmask4.sin_family = AF_INET;
address->is_internal = flg.ifr_flags & IFF_LOOPBACK ? 1 : 0;
memset(address->phys_addr, 0, sizeof(address->phys_addr));
address++;