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rtnlutil: Utils to Add/Remove IPv4 addresses

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This commit is contained in:
Tim Kourt 2019-06-25 15:20:58 -07:00 committed by Denis Kenzior
parent b70ff5d091
commit 6aabd80051
2 changed files with 99 additions and 0 deletions
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89
src/rtnlutil.c
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@ -43,6 +43,18 @@ static size_t rta_add_u8(void *rta_buf, unsigned short type, uint8_t value)
return RTA_SPACE(sizeof(uint8_t));
}
static size_t rta_add_data(void *rta_buf, unsigned short type, void *data,
size_t data_len)
{
struct rtattr *rta = rta_buf;
rta->rta_len = RTA_LENGTH(data_len);
rta->rta_type = type;
memcpy(RTA_DATA(rta), data, data_len);
return RTA_SPACE(data_len);
}
uint32_t rtnl_set_linkmode_and_operstate(struct l_netlink *rtnl, int ifindex,
uint8_t linkmode, uint8_t operstate,
l_netlink_command_func_t cb,
@ -131,3 +143,80 @@ uint32_t rtnl_ifaddr_get(struct l_netlink *rtnl, l_netlink_command_func_t cb,
return id;
}
static uint32_t rtnl_ifaddr_change(struct l_netlink *rtnl, uint16_t nlmsg_type,
int ifindex, uint8_t prefix_len,
const char *ip, const char *broadcast,
l_netlink_command_func_t
cb, void *user_data,
l_netlink_destroy_func_t destroy)
{
struct ifaddrmsg *rtmmsg;
struct in_addr in_addr;
void *rta_buf;
size_t bufsize;
uint32_t id;
bufsize = NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
RTA_SPACE(sizeof(struct in_addr)) +
RTA_SPACE(sizeof(struct in_addr));
rtmmsg = l_malloc(bufsize);
explicit_bzero(rtmmsg, bufsize);
rtmmsg->ifa_index = ifindex;
rtmmsg->ifa_family = AF_INET;
rtmmsg->ifa_flags = IFA_F_PERMANENT;
rtmmsg->ifa_scope = RT_SCOPE_UNIVERSE;
rtmmsg->ifa_prefixlen = prefix_len;
rta_buf = (void *) rtmmsg + NLMSG_ALIGN(sizeof(struct ifaddrmsg));
if (inet_pton(AF_INET, ip, &in_addr) < 1) {
l_free(rtmmsg);
return 0;
}
rta_buf += rta_add_data(rta_buf, IFA_LOCAL, &in_addr,
sizeof(struct in_addr));
if (broadcast) {
if (inet_pton(AF_INET, broadcast, &in_addr) < 1) {
l_free(rtmmsg);
return 0;
}
} else {
in_addr.s_addr = in_addr.s_addr |
htonl(0xFFFFFFFFLU >> prefix_len);
}
rta_buf += rta_add_data(rta_buf, IFA_BROADCAST, &in_addr,
sizeof(struct in_addr));
id = l_netlink_send(rtnl, nlmsg_type, 0, rtmmsg,
rta_buf - (void *) rtmmsg, cb,
user_data, destroy);
l_free(rtmmsg);
return id;
}
uint32_t rtnl_ifaddr_add(struct l_netlink *rtnl, int ifindex,
uint8_t prefix_len, const char *ip,
const char *broadcast,
l_netlink_command_func_t cb, void *user_data,
l_netlink_destroy_func_t destroy)
{
return rtnl_ifaddr_change(rtnl, RTM_NEWADDR, ifindex, prefix_len, ip,
broadcast, cb, user_data, destroy);
}
uint32_t rtnl_ifaddr_delete(struct l_netlink *rtnl, int ifindex,
uint8_t prefix_len, const char *ip,
const char *broadcast,
l_netlink_command_func_t cb, void *user_data,
l_netlink_destroy_func_t destroy)
{
return rtnl_ifaddr_change(rtnl, RTM_DELADDR, ifindex, prefix_len, ip,
broadcast, cb, user_data, destroy);
}

10
src/rtnlutil.h
View File

@ -31,3 +31,13 @@ void rtnl_ifaddr_extract(const struct ifaddrmsg *ifa, int bytes,
uint32_t rtnl_ifaddr_get(struct l_netlink *rtnl, l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy);
uint32_t rtnl_ifaddr_add(struct l_netlink *rtnl, int ifindex,
uint8_t prefix_len, const char *ip,
const char *broadcast,
l_netlink_command_func_t cb, void *user_data,
l_netlink_destroy_func_t destroy);
uint32_t rtnl_ifaddr_delete(struct l_netlink *rtnl, int ifindex,
uint8_t prefix_len, const char *ip,
const char *broadcast,
l_netlink_command_func_t cb, void *user_data,
l_netlink_destroy_func_t destroy);