return recvmsg(nlfd, &msg, 0);
}
-static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, int msg_count)
+static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, ssize_t len, int msg_count)
{
- ssize_t len;
- uint32_t seqnum;
+ uint32_t seqnum = 0;
// expect ack
for (; NLMSG_OK (ack_nh, len); ack_nh = NLMSG_NEXT (ack_nh, len))
--msg_count;
if (errmsg->msg.nlmsg_seq > seqnum);
seqnum = errmsg->msg.nlmsg_seq;
+ // if this is a single message, return now
+ if (!(ack_nh->nlmsg_flags & NLM_F_MULTI))
+ return msg_count != 0 || seqnum != nlseqnum;
}
}
else
struct ifinfomsg ifinfo;
struct ifreq ifr;
char buf[4096];
+ ssize_t len;
+ struct nlmsghdr *resp_nh;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
{
// get the interface index
- ssize_t len;
struct {
struct nlmsghdr nh;
struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
char ifname[IFNAMSIZ];
} req;
- struct nlmsghdr *resp_nh;
req.nh.nlmsg_type = RTM_GETLINK;
req.nh.nlmsg_flags = NLM_F_REQUEST;
req.ifname_rta.rta_type = IFLA_IFNAME;
strncpy(req.ifname, config->tundevice, IFNAMSIZ-1);
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
+ + req.ifname_rta.rta_len);
+
if(netlink_send(&req.nh, 0) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
{
LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
}
resp_nh = (struct nlmsghdr *)buf;
- if (NLMSG_OK (resp_nh, len) && resp_nh->nlmsg_type == RTM_GETLINK)
- {
- memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
- // got index
- tunidx = ifinfo.ifi_index;
- }
- else
+ if (!NLMSG_OK (resp_nh, len))
{
LOG(0, 0, 0, "Malformed answer getting tun ifindex\n");
exit(1);
}
+
+ memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
+ // got index
+ tunidx = ifinfo.ifi_index;
}
{
ssize_t err;
struct {
// interface setting
struct nlmsghdr nh;
- struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct rtattr txqlen_rta __attribute__ ((aligned(RTA_ALIGNTO)));
- uint32_t txqlen;
- struct rtattr mtu_rta __attribute__ ((aligned(RTA_ALIGNTO)));
- uint32_t mtu;
-
- // IPv4 address
- struct nlmsghdr addr_nh __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct ifaddrmsg ifaddr __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct rtattr addr_rta __attribute__ ((aligned(RTA_ALIGNTO)));
- struct in_addr addr;
-
- // IPv6 LL address
- struct nlmsghdr lladdr6_nh __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct ifaddrmsg llifaddr6 __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct rtattr lladdr6_rta __attribute__ ((aligned(RTA_ALIGNTO)));
- struct in6_addr lladdr6;
-
- // IPv6 global address
- struct nlmsghdr addr6_nh __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct ifaddrmsg ifaddr6 __attribute__ ((aligned(NLMSG_ALIGNTO)));
- struct rtattr addr6_rta __attribute__ ((aligned(RTA_ALIGNTO)));
- struct in6_addr addr6;
-
- // end header
- struct nlmsghdr end_nh __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ union {
+ struct ifinfomsg ifinfo;
+ struct ifaddrmsg ifaddr;
+ } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO)));
+ char rtdata[32]; // 32 should be enough
} req;
- char buf[4096];
+ struct {
+ struct rtattr rta;
+ uint32_t u32 __attribute__ ((aligned(RTA_ALIGNTO)));;
+ } u32_attr;
+ struct {
+ struct rtattr rta;
+ struct in_addr addr __attribute__ ((aligned(RTA_ALIGNTO)));;
+ } ipv4_attr;
+ struct {
+ struct rtattr rta;
+ struct in6_addr addr6 __attribute__ ((aligned(RTA_ALIGNTO)));;
+ } ipv6_attr;
+ char buf[256];
+ ssize_t buf_len;
+ char *buf_ptr;
memset(&req, 0, sizeof(req));
- req.nh.nlmsg_type = RTM_NEWLINK;
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_MULTI;
+ req.nh.nlmsg_type = RTM_SETLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
- req.ifinfo = ifinfo;
- req.ifinfo.ifi_flags |= IFF_UP; // set interface up
- req.ifinfo.ifi_change = IFF_UP; // only change this flag
+ req.ifmsg.ifinfo = ifinfo;
+ req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
+ req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
- req.txqlen_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
- req.txqlen_rta.rta_type = IFLA_TXQLEN;
+ buf_ptr = NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifinfo);
+
+ u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
+ u32_attr.rta.rta_type = IFLA_TXQLEN;
/* Bump up the qlen to deal with bursts from the network */
- req.txqlen = 1000;
+ u32_attr.u32 = 1000;
+ memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
+
+ buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len);
- req.mtu_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
- req.mtu_rta.rta_type = IFLA_MTU;
+ u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32));
+ u32_attr.rta.rta_type = IFLA_MTU;
/* set MTU to modem MRU */
- req.mtu = MRU;
+ u32_attr.u32 = MRU;
+ memcpy(buf_ptr, &u32_attr, sizeof(u32_attr));
- req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
- + req.txqlen_rta.rta_len
- + req.mtu_rta.rta_len);
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo)
+ + u32_attr.rta.rta_len * 2);
+
+ if (netlink_send(&req.nh, 1) < 0)
+ {
+ LOG(0, 0, 0, "Error setting up tun device interface: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ memset(&req, 0, sizeof(req));
- req.addr_nh.nlmsg_type = RTM_NEWADDR;
- req.addr_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+ req.nh.nlmsg_type = RTM_NEWADDR;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
- req.ifaddr.ifa_family = AF_INET;
- req.ifaddr.ifa_prefixlen = 32;
- req.ifaddr.ifa_index = ifinfo.ifi_index;
+ req.ifmsg.ifaddr.ifa_family = AF_INET;
+ req.ifmsg.ifaddr.ifa_prefixlen = 32;
+ req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
- req.addr_rta.rta_len = RTA_LENGTH(sizeof(req.addr));
- req.addr_rta.rta_type = IFA_ADDRESS;
- req.addr.s_addr = config->bind_address ?
+ ipv4_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv4_attr.addr));
+ ipv4_attr.rta.rta_type = IFA_ADDRESS;
+ ipv4_attr.addr.s_addr = config->bind_address ?
config->bind_address : 0x01010101; // 1.1.1.1
+ memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv4_attr, sizeof(ipv4_attr));
- req.addr_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
- + req.addr_rta.rta_len);
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
+ + ipv4_attr.rta.rta_len);
+
+ if (netlink_send(&req.nh, 1) < 0)
+ {
+ LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ memset(&req, 0, sizeof(req));
// Only setup IPv6 on the tun device if we have a configured prefix
if (config->ipv6_prefix.s6_addr[0]) {
- req.lladdr6_nh.nlmsg_type = RTM_NEWADDR;
- req.lladdr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+ req.nh.nlmsg_type = RTM_NEWADDR;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
- req.llifaddr6.ifa_family = AF_INET6;
- req.llifaddr6.ifa_prefixlen = 64;
- req.llifaddr6.ifa_scope = RT_SCOPE_LINK;
- req.llifaddr6.ifa_index = ifinfo.ifi_index;
+ req.ifmsg.ifaddr.ifa_family = AF_INET6;
+ req.ifmsg.ifaddr.ifa_prefixlen = 64;
+ req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
+ req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
- req.lladdr6_rta.rta_len = RTA_LENGTH(sizeof(req.lladdr6));
- req.lladdr6_rta.rta_type = IFA_LOCAL;
+ ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
+ ipv6_attr.rta.rta_type = IFA_LOCAL;
// Link local address is FE80::1
- memset(&req.lladdr6, 0, sizeof(req.lladdr6));
- req.lladdr6.s6_addr[0] = 0xFE;
- req.lladdr6.s6_addr[1] = 0x80;
- req.lladdr6.s6_addr[15] = 1;
+ memset(&ipv6_attr.addr6, 0, sizeof(ipv6_attr.addr6));
+ ipv6_attr.addr6.s6_addr[0] = 0xFE;
+ ipv6_attr.addr6.s6_addr[1] = 0x80;
+ ipv6_attr.addr6.s6_addr[15] = 1;
+ memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
+
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
+ + ipv6_attr.rta.rta_len);
- req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
- + req.lladdr6_rta.rta_len);
+ if (netlink_send(&req.nh, 1) < 0)
+ {
+ LOG(0, 0, 0, "Error setting up tun device IPv6 LL address: %s\n", strerror(errno));
+ exit(1);
+ }
- req.addr6_nh.nlmsg_type = RTM_NEWADDR;
- req.addr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
+ memset(&req, 0, sizeof(req));
- req.ifaddr6.ifa_family = AF_INET6;
- req.ifaddr6.ifa_prefixlen = 64;
- req.ifaddr6.ifa_scope = RT_SCOPE_UNIVERSE;
- req.ifaddr6.ifa_index = ifinfo.ifi_index;
+ req.nh.nlmsg_type = RTM_NEWADDR;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
- req.addr6_rta.rta_len = RTA_LENGTH(sizeof(req.addr6));
- req.addr6_rta.rta_type = IFA_LOCAL;
+ req.ifmsg.ifaddr.ifa_family = AF_INET6;
+ req.ifmsg.ifaddr.ifa_prefixlen = 64;
+ req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
+ req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index;
+
+ ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6));
+ ipv6_attr.rta.rta_type = IFA_LOCAL;
// Global address is prefix::1
- req.addr6 = config->ipv6_prefix;
- req.addr6.s6_addr[15] = 1;
+ ipv6_attr.addr6 = config->ipv6_prefix;
+ ipv6_attr.addr6.s6_addr[15] = 1;
+ memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr));
- req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
- + req.lladdr6_rta.rta_len);
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)
+ + ipv6_attr.rta.rta_len);
- req.end_nh.nlmsg_type = NLMSG_DONE;
- req.end_nh.nlmsg_len = NLMSG_LENGTH(0);
- }
- else
- {
- // we terminate at the beginning of IPv6 stuff
- req.lladdr6_nh.nlmsg_type = NLMSG_DONE;
- req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(0);
+ if (netlink_send(&req.nh, 1) < 0)
+ {
+ LOG(0, 0, 0, "Error setting up tun device IPv6 global address: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ memset(&req, 0, sizeof(req));
}
+ req.nh.nlmsg_type = NLMSG_DONE;
+ req.nh.nlmsg_len = NLMSG_LENGTH(0);
+
if (netlink_send(&req.nh, 1) < 0)
{
- LOG(0, 0, 0, "Error setting up tun device: %s\n", strerror(errno));
+ LOG(0, 0, 0, "Error finishing setting up tun device: %s\n", strerror(errno));
exit(1);
}
- if (netlink_recv(buf, sizeof(buf)) < 0)
+ buf_ptr = buf;
+ buf_len = sizeof(buf);
+ do
{
- LOG(0, 0, 0, "Error waiting ack for setting up tun device: %s\n", strerror(errno));
- exit(1);
+ len = netlink_recv(buf_ptr, sizeof(buf_len));
+ if (len < 0)
+ {
+ LOG(0, 0, 0, "Error waiting for ack setting up tun device: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ resp_nh = (struct nlmsghdr *)buf_ptr;
+ buf_len -= len;
+ buf_ptr += len;
}
+ while (buf_len > 0 && (resp_nh->nlmsg_flags & NLM_F_MULTI)
+ && resp_nh->nlmsg_type != NLMSG_DONE);
- if ((err = netlink_check_ack((struct nlmsghdr *)buf, 4)))
+ if ((err = netlink_check_ack((struct nlmsghdr *)buf, buf_len, 4)))
{
if (err < 0)
LOG(0, 0, 0, "Error while receiving tun device ack: %s\n", strerror(errno));
projects / l2tpns.git / commitdiff