diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/ifaddrs.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/ifaddrs.c | 846 |
1 files changed, 846 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/ifaddrs.c b/REORG.TODO/sysdeps/unix/sysv/linux/ifaddrs.c new file mode 100644 index 0000000000..3bc9902863 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/ifaddrs.c @@ -0,0 +1,846 @@ +/* getifaddrs -- get names and addresses of all network interfaces + Copyright (C) 2003-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <alloca.h> +#include <assert.h> +#include <errno.h> +#include <ifaddrs.h> +#include <net/if.h> +#include <netinet/in.h> +#include <netpacket/packet.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sysdep.h> +#include <time.h> +#include <unistd.h> + +#include "netlinkaccess.h" + + +/* There is a problem with this type. The address length for + Infiniband sockets is much longer than the 8 bytes allocated in the + sockaddr_ll definition. Hence we use here a special + definition. */ +struct sockaddr_ll_max + { + unsigned short int sll_family; + unsigned short int sll_protocol; + int sll_ifindex; + unsigned short int sll_hatype; + unsigned char sll_pkttype; + unsigned char sll_halen; + unsigned char sll_addr[24]; + }; + + +/* struct to hold the data for one ifaddrs entry, so we can allocate + everything at once. */ +struct ifaddrs_storage +{ + struct ifaddrs ifa; + union + { + /* Save space for the biggest of the four used sockaddr types and + avoid a lot of casts. */ + struct sockaddr sa; + struct sockaddr_ll_max sl; + struct sockaddr_in s4; + struct sockaddr_in6 s6; + } addr, netmask, broadaddr; + char name[IF_NAMESIZE + 1]; +}; + + +void +__netlink_free_handle (struct netlink_handle *h) +{ + struct netlink_res *ptr; + int saved_errno = errno; + + ptr = h->nlm_list; + while (ptr != NULL) + { + struct netlink_res *tmpptr; + + tmpptr = ptr->next; + free (ptr); + ptr = tmpptr; + } + + __set_errno (saved_errno); +} + + +static int +__netlink_sendreq (struct netlink_handle *h, int type) +{ + struct req + { + struct nlmsghdr nlh; + struct rtgenmsg g; + char pad[0]; + } req; + struct sockaddr_nl nladdr; + + if (h->seq == 0) + h->seq = time (NULL); + + req.nlh.nlmsg_len = sizeof (req); + req.nlh.nlmsg_type = type; + req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; + req.nlh.nlmsg_pid = 0; + req.nlh.nlmsg_seq = h->seq; + req.g.rtgen_family = AF_UNSPEC; + if (sizeof (req) != offsetof (struct req, pad)) + memset (req.pad, '\0', sizeof (req) - offsetof (struct req, pad)); + + memset (&nladdr, '\0', sizeof (nladdr)); + nladdr.nl_family = AF_NETLINK; + + return TEMP_FAILURE_RETRY (__sendto (h->fd, (void *) &req, sizeof (req), 0, + (struct sockaddr *) &nladdr, + sizeof (nladdr))); +} + + +int +__netlink_request (struct netlink_handle *h, int type) +{ + struct netlink_res *nlm_next; + struct sockaddr_nl nladdr; + struct nlmsghdr *nlmh; + ssize_t read_len; + bool done = false; + +#ifdef PAGE_SIZE + /* Help the compiler optimize out the malloc call if PAGE_SIZE + is constant and smaller or equal to PTHREAD_STACK_MIN/4. */ + const size_t buf_size = PAGE_SIZE; +#else + const size_t buf_size = __getpagesize (); +#endif + bool use_malloc = false; + char *buf; + + if (__libc_use_alloca (buf_size)) + buf = alloca (buf_size); + else + { + buf = malloc (buf_size); + if (buf != NULL) + use_malloc = true; + else + goto out_fail; + } + + struct iovec iov = { buf, buf_size }; + + if (__netlink_sendreq (h, type) < 0) + goto out_fail; + + while (! done) + { + struct msghdr msg = + { + .msg_name = (void *) &nladdr, + .msg_namelen = sizeof (nladdr), + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = 0 + }; + + read_len = TEMP_FAILURE_RETRY (__recvmsg (h->fd, &msg, 0)); + __netlink_assert_response (h->fd, read_len); + if (read_len < 0) + goto out_fail; + + if (nladdr.nl_pid != 0) + continue; + + if (__glibc_unlikely (msg.msg_flags & MSG_TRUNC)) + goto out_fail; + + size_t count = 0; + size_t remaining_len = read_len; + for (nlmh = (struct nlmsghdr *) buf; + NLMSG_OK (nlmh, remaining_len); + nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, remaining_len)) + { + if ((pid_t) nlmh->nlmsg_pid != h->pid + || nlmh->nlmsg_seq != h->seq) + continue; + + ++count; + if (nlmh->nlmsg_type == NLMSG_DONE) + { + /* We found the end, leave the loop. */ + done = true; + break; + } + if (nlmh->nlmsg_type == NLMSG_ERROR) + { + struct nlmsgerr *nlerr = (struct nlmsgerr *) NLMSG_DATA (nlmh); + if (nlmh->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) + errno = EIO; + else + errno = -nlerr->error; + goto out_fail; + } + } + + /* If there was nothing with the expected nlmsg_pid and nlmsg_seq, + there is no point to record it. */ + if (count == 0) + continue; + + nlm_next = (struct netlink_res *) malloc (sizeof (struct netlink_res) + + read_len); + if (nlm_next == NULL) + goto out_fail; + nlm_next->next = NULL; + nlm_next->nlh = memcpy (nlm_next + 1, buf, read_len); + nlm_next->size = read_len; + nlm_next->seq = h->seq; + if (h->nlm_list == NULL) + h->nlm_list = nlm_next; + else + h->end_ptr->next = nlm_next; + h->end_ptr = nlm_next; + } + + if (use_malloc) + free (buf); + return 0; + +out_fail: + if (use_malloc) + free (buf); + return -1; +} + + +void +__netlink_close (struct netlink_handle *h) +{ + /* Don't modify errno. */ + INTERNAL_SYSCALL_DECL (err); + (void) INTERNAL_SYSCALL (close, err, 1, h->fd); +} + + +/* Open a NETLINK socket. */ +int +__netlink_open (struct netlink_handle *h) +{ + struct sockaddr_nl nladdr; + + h->fd = __socket (PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE); + if (h->fd < 0) + goto out; + + memset (&nladdr, '\0', sizeof (nladdr)); + nladdr.nl_family = AF_NETLINK; + if (__bind (h->fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) < 0) + { + close_and_out: + __netlink_close (h); + out: + return -1; + } + /* Determine the ID the kernel assigned for this netlink connection. + It is not necessarily the PID if there is more than one socket + open. */ + socklen_t addr_len = sizeof (nladdr); + if (__getsockname (h->fd, (struct sockaddr *) &nladdr, &addr_len) < 0) + goto close_and_out; + h->pid = nladdr.nl_pid; + return 0; +} + + +/* We know the number of RTM_NEWLINK entries, so we reserve the first + # of entries for this type. All RTM_NEWADDR entries have an index + pointer to the RTM_NEWLINK entry. To find the entry, create + a table to map kernel index entries to our index numbers. + Since we get at first all RTM_NEWLINK entries, it can never happen + that a RTM_NEWADDR index is not known to this map. */ +static int +internal_function +map_newlink (int index, struct ifaddrs_storage *ifas, int *map, int max) +{ + int i; + + for (i = 0; i < max; i++) + { + if (map[i] == -1) + { + map[i] = index; + if (i > 0) + ifas[i - 1].ifa.ifa_next = &ifas[i].ifa; + return i; + } + else if (map[i] == index) + return i; + } + + /* This means interfaces changed between the reading of the + RTM_GETLINK and RTM_GETADDR information. We have to repeat + everything. */ + return -1; +} + + +/* Create a linked list of `struct ifaddrs' structures, one for each + network interface on the host machine. If successful, store the + list in *IFAP and return 0. On errors, return -1 and set `errno'. */ +static int +getifaddrs_internal (struct ifaddrs **ifap) +{ + struct netlink_handle nh = { 0, 0, 0, NULL, NULL }; + struct netlink_res *nlp; + struct ifaddrs_storage *ifas; + unsigned int i, newlink, newaddr, newaddr_idx; + int *map_newlink_data; + size_t ifa_data_size = 0; /* Size to allocate for all ifa_data. */ + char *ifa_data_ptr; /* Pointer to the unused part of memory for + ifa_data. */ + int result = 0; + + *ifap = NULL; + + if (__netlink_open (&nh) < 0) + return -1; + + /* Tell the kernel that we wish to get a list of all + active interfaces, collect all data for every interface. */ + if (__netlink_request (&nh, RTM_GETLINK) < 0) + { + result = -1; + goto exit_free; + } + + /* Now ask the kernel for all addresses which are assigned + to an interface and collect all data for every interface. + Since we store the addresses after the interfaces in the + list, we will later always find the interface before the + corresponding addresses. */ + ++nh.seq; + if (__netlink_request (&nh, RTM_GETADDR) < 0) + { + result = -1; + goto exit_free; + } + + /* Count all RTM_NEWLINK and RTM_NEWADDR entries to allocate + enough memory. */ + newlink = newaddr = 0; + for (nlp = nh.nlm_list; nlp; nlp = nlp->next) + { + struct nlmsghdr *nlh; + size_t size = nlp->size; + + if (nlp->nlh == NULL) + continue; + + /* Walk through all entries we got from the kernel and look, which + message type they contain. */ + for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) + { + /* Check if the message is what we want. */ + if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) + continue; + + if (nlh->nlmsg_type == NLMSG_DONE) + break; /* ok */ + + if (nlh->nlmsg_type == RTM_NEWLINK) + { + /* A RTM_NEWLINK message can have IFLA_STATS data. We need to + know the size before creating the list to allocate enough + memory. */ + struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh); + struct rtattr *rta = IFLA_RTA (ifim); + size_t rtasize = IFLA_PAYLOAD (nlh); + + while (RTA_OK (rta, rtasize)) + { + size_t rta_payload = RTA_PAYLOAD (rta); + + if (rta->rta_type == IFLA_STATS) + { + ifa_data_size += rta_payload; + break; + } + else + rta = RTA_NEXT (rta, rtasize); + } + ++newlink; + } + else if (nlh->nlmsg_type == RTM_NEWADDR) + ++newaddr; + } + } + + /* Return if no interface is up. */ + if ((newlink + newaddr) == 0) + goto exit_free; + + /* Allocate memory for all entries we have and initialize next + pointer. */ + ifas = (struct ifaddrs_storage *) calloc (1, + (newlink + newaddr) + * sizeof (struct ifaddrs_storage) + + ifa_data_size); + if (ifas == NULL) + { + result = -1; + goto exit_free; + } + + /* Table for mapping kernel index to entry in our list. */ + map_newlink_data = alloca (newlink * sizeof (int)); + memset (map_newlink_data, '\xff', newlink * sizeof (int)); + + ifa_data_ptr = (char *) &ifas[newlink + newaddr]; + newaddr_idx = 0; /* Counter for newaddr index. */ + + /* Walk through the list of data we got from the kernel. */ + for (nlp = nh.nlm_list; nlp; nlp = nlp->next) + { + struct nlmsghdr *nlh; + size_t size = nlp->size; + + if (nlp->nlh == NULL) + continue; + + /* Walk through one message and look at the type: If it is our + message, we need RTM_NEWLINK/RTM_NEWADDR and stop if we reach + the end or we find the end marker (in this case we ignore the + following data. */ + for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) + { + int ifa_index = 0; + + /* Check if the message is the one we want */ + if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) + continue; + + if (nlh->nlmsg_type == NLMSG_DONE) + break; /* ok */ + + if (nlh->nlmsg_type == RTM_NEWLINK) + { + /* We found a new interface. Now extract everything from the + interface data we got and need. */ + struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh); + struct rtattr *rta = IFLA_RTA (ifim); + size_t rtasize = IFLA_PAYLOAD (nlh); + + /* Interfaces are stored in the first "newlink" entries + of our list, starting in the order as we got from the + kernel. */ + ifa_index = map_newlink (ifim->ifi_index - 1, ifas, + map_newlink_data, newlink); + if (__glibc_unlikely (ifa_index == -1)) + { + try_again: + result = -EAGAIN; + free (ifas); + goto exit_free; + } + ifas[ifa_index].ifa.ifa_flags = ifim->ifi_flags; + + while (RTA_OK (rta, rtasize)) + { + char *rta_data = RTA_DATA (rta); + size_t rta_payload = RTA_PAYLOAD (rta); + + switch (rta->rta_type) + { + case IFLA_ADDRESS: + if (rta_payload <= sizeof (ifas[ifa_index].addr)) + { + ifas[ifa_index].addr.sl.sll_family = AF_PACKET; + memcpy (ifas[ifa_index].addr.sl.sll_addr, + (char *) rta_data, rta_payload); + ifas[ifa_index].addr.sl.sll_halen = rta_payload; + ifas[ifa_index].addr.sl.sll_ifindex + = ifim->ifi_index; + ifas[ifa_index].addr.sl.sll_hatype = ifim->ifi_type; + + ifas[ifa_index].ifa.ifa_addr + = &ifas[ifa_index].addr.sa; + } + break; + + case IFLA_BROADCAST: + if (rta_payload <= sizeof (ifas[ifa_index].broadaddr)) + { + ifas[ifa_index].broadaddr.sl.sll_family = AF_PACKET; + memcpy (ifas[ifa_index].broadaddr.sl.sll_addr, + (char *) rta_data, rta_payload); + ifas[ifa_index].broadaddr.sl.sll_halen = rta_payload; + ifas[ifa_index].broadaddr.sl.sll_ifindex + = ifim->ifi_index; + ifas[ifa_index].broadaddr.sl.sll_hatype + = ifim->ifi_type; + + ifas[ifa_index].ifa.ifa_broadaddr + = &ifas[ifa_index].broadaddr.sa; + } + break; + + case IFLA_IFNAME: /* Name of Interface */ + if ((rta_payload + 1) <= sizeof (ifas[ifa_index].name)) + { + ifas[ifa_index].ifa.ifa_name = ifas[ifa_index].name; + *(char *) __mempcpy (ifas[ifa_index].name, rta_data, + rta_payload) = '\0'; + } + break; + + case IFLA_STATS: /* Statistics of Interface */ + ifas[ifa_index].ifa.ifa_data = ifa_data_ptr; + ifa_data_ptr += rta_payload; + memcpy (ifas[ifa_index].ifa.ifa_data, rta_data, + rta_payload); + break; + + case IFLA_UNSPEC: + break; + case IFLA_MTU: + break; + case IFLA_LINK: + break; + case IFLA_QDISC: + break; + default: + break; + } + + rta = RTA_NEXT (rta, rtasize); + } + } + else if (nlh->nlmsg_type == RTM_NEWADDR) + { + struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlh); + struct rtattr *rta = IFA_RTA (ifam); + size_t rtasize = IFA_PAYLOAD (nlh); + + /* New Addresses are stored in the order we got them from + the kernel after the interfaces. Theoretically it is possible + that we have holes in the interface part of the list, + but we always have already the interface for this address. */ + ifa_index = newlink + newaddr_idx; + int idx = map_newlink (ifam->ifa_index - 1, ifas, + map_newlink_data, newlink); + if (__glibc_unlikely (idx == -1)) + goto try_again; + ifas[ifa_index].ifa.ifa_flags = ifas[idx].ifa.ifa_flags; + if (ifa_index > 0) + ifas[ifa_index - 1].ifa.ifa_next = &ifas[ifa_index].ifa; + ++newaddr_idx; + + while (RTA_OK (rta, rtasize)) + { + char *rta_data = RTA_DATA (rta); + size_t rta_payload = RTA_PAYLOAD (rta); + + switch (rta->rta_type) + { + case IFA_ADDRESS: + { + struct sockaddr *sa; + + if (ifas[ifa_index].ifa.ifa_addr != NULL) + { + /* In a point-to-poing network IFA_ADDRESS + contains the destination address, local + address is supplied in IFA_LOCAL attribute. + destination address and broadcast address + are stored in an union, so it doesn't matter + which name we use. */ + ifas[ifa_index].ifa.ifa_broadaddr + = &ifas[ifa_index].broadaddr.sa; + sa = &ifas[ifa_index].broadaddr.sa; + } + else + { + ifas[ifa_index].ifa.ifa_addr + = &ifas[ifa_index].addr.sa; + sa = &ifas[ifa_index].addr.sa; + } + + sa->sa_family = ifam->ifa_family; + + switch (ifam->ifa_family) + { + case AF_INET: + /* Size must match that of an address for IPv4. */ + if (rta_payload == 4) + memcpy (&((struct sockaddr_in *) sa)->sin_addr, + rta_data, rta_payload); + break; + + case AF_INET6: + /* Size must match that of an address for IPv6. */ + if (rta_payload == 16) + { + memcpy (&((struct sockaddr_in6 *) sa)->sin6_addr, + rta_data, rta_payload); + if (IN6_IS_ADDR_LINKLOCAL (rta_data) + || IN6_IS_ADDR_MC_LINKLOCAL (rta_data)) + ((struct sockaddr_in6 *) sa)->sin6_scope_id + = ifam->ifa_index; + } + break; + + default: + if (rta_payload <= sizeof (ifas[ifa_index].addr)) + memcpy (sa->sa_data, rta_data, rta_payload); + break; + } + } + break; + + case IFA_LOCAL: + if (ifas[ifa_index].ifa.ifa_addr != NULL) + { + /* If ifa_addr is set and we get IFA_LOCAL, + assume we have a point-to-point network. + Move address to correct field. */ + ifas[ifa_index].broadaddr = ifas[ifa_index].addr; + ifas[ifa_index].ifa.ifa_broadaddr + = &ifas[ifa_index].broadaddr.sa; + memset (&ifas[ifa_index].addr, '\0', + sizeof (ifas[ifa_index].addr)); + } + + ifas[ifa_index].ifa.ifa_addr = &ifas[ifa_index].addr.sa; + ifas[ifa_index].ifa.ifa_addr->sa_family + = ifam->ifa_family; + + switch (ifam->ifa_family) + { + case AF_INET: + /* Size must match that of an address for IPv4. */ + if (rta_payload == 4) + memcpy (&ifas[ifa_index].addr.s4.sin_addr, + rta_data, rta_payload); + break; + + case AF_INET6: + /* Size must match that of an address for IPv6. */ + if (rta_payload == 16) + { + memcpy (&ifas[ifa_index].addr.s6.sin6_addr, + rta_data, rta_payload); + if (IN6_IS_ADDR_LINKLOCAL (rta_data) + || IN6_IS_ADDR_MC_LINKLOCAL (rta_data)) + ifas[ifa_index].addr.s6.sin6_scope_id = + ifam->ifa_index; + } + break; + + default: + if (rta_payload <= sizeof (ifas[ifa_index].addr)) + memcpy (ifas[ifa_index].addr.sa.sa_data, + rta_data, rta_payload); + break; + } + break; + + case IFA_BROADCAST: + /* We get IFA_BROADCAST, so IFA_LOCAL was too much. */ + if (ifas[ifa_index].ifa.ifa_broadaddr != NULL) + memset (&ifas[ifa_index].broadaddr, '\0', + sizeof (ifas[ifa_index].broadaddr)); + + ifas[ifa_index].ifa.ifa_broadaddr + = &ifas[ifa_index].broadaddr.sa; + ifas[ifa_index].ifa.ifa_broadaddr->sa_family + = ifam->ifa_family; + + switch (ifam->ifa_family) + { + case AF_INET: + /* Size must match that of an address for IPv4. */ + if (rta_payload == 4) + memcpy (&ifas[ifa_index].broadaddr.s4.sin_addr, + rta_data, rta_payload); + break; + + case AF_INET6: + /* Size must match that of an address for IPv6. */ + if (rta_payload == 16) + { + memcpy (&ifas[ifa_index].broadaddr.s6.sin6_addr, + rta_data, rta_payload); + if (IN6_IS_ADDR_LINKLOCAL (rta_data) + || IN6_IS_ADDR_MC_LINKLOCAL (rta_data)) + ifas[ifa_index].broadaddr.s6.sin6_scope_id + = ifam->ifa_index; + } + break; + + default: + if (rta_payload <= sizeof (ifas[ifa_index].addr)) + memcpy (&ifas[ifa_index].broadaddr.sa.sa_data, + rta_data, rta_payload); + break; + } + break; + + case IFA_LABEL: + if (rta_payload + 1 <= sizeof (ifas[ifa_index].name)) + { + ifas[ifa_index].ifa.ifa_name = ifas[ifa_index].name; + *(char *) __mempcpy (ifas[ifa_index].name, rta_data, + rta_payload) = '\0'; + } + else + abort (); + break; + + case IFA_UNSPEC: + break; + case IFA_CACHEINFO: + break; + default: + break; + } + + rta = RTA_NEXT (rta, rtasize); + } + + /* If we didn't get the interface name with the + address, use the name from the interface entry. */ + if (ifas[ifa_index].ifa.ifa_name == NULL) + { + int idx = map_newlink (ifam->ifa_index - 1, ifas, + map_newlink_data, newlink); + if (__glibc_unlikely (idx == -1)) + goto try_again; + ifas[ifa_index].ifa.ifa_name = ifas[idx].ifa.ifa_name; + } + + /* Calculate the netmask. */ + if (ifas[ifa_index].ifa.ifa_addr + && ifas[ifa_index].ifa.ifa_addr->sa_family != AF_UNSPEC + && ifas[ifa_index].ifa.ifa_addr->sa_family != AF_PACKET) + { + uint32_t max_prefixlen = 0; + char *cp = NULL; + + ifas[ifa_index].ifa.ifa_netmask + = &ifas[ifa_index].netmask.sa; + + switch (ifas[ifa_index].ifa.ifa_addr->sa_family) + { + case AF_INET: + cp = (char *) &ifas[ifa_index].netmask.s4.sin_addr; + max_prefixlen = 32; + break; + + case AF_INET6: + cp = (char *) &ifas[ifa_index].netmask.s6.sin6_addr; + max_prefixlen = 128; + break; + } + + ifas[ifa_index].ifa.ifa_netmask->sa_family + = ifas[ifa_index].ifa.ifa_addr->sa_family; + + if (cp != NULL) + { + unsigned int preflen; + + if (ifam->ifa_prefixlen > max_prefixlen) + preflen = max_prefixlen; + else + preflen = ifam->ifa_prefixlen; + + for (i = 0; i < preflen / 8; i++) + *cp++ = 0xff; + if (preflen % 8) + *cp = 0xff << (8 - preflen % 8); + } + } + } + } + } + + assert (ifa_data_ptr <= (char *) &ifas[newlink + newaddr] + ifa_data_size); + + if (newaddr_idx > 0) + { + for (i = 0; i < newlink; ++i) + if (map_newlink_data[i] == -1) + { + /* We have fewer links then we anticipated. Adjust the + forward pointer to the first address entry. */ + ifas[i - 1].ifa.ifa_next = &ifas[newlink].ifa; + } + + if (i == 0 && newlink > 0) + /* No valid link, but we allocated memory. We have to + populate the first entry. */ + memmove (ifas, &ifas[newlink], sizeof (struct ifaddrs_storage)); + } + + *ifap = &ifas[0].ifa; + + exit_free: + __netlink_free_handle (&nh); + __netlink_close (&nh); + + return result; +} + + +/* Create a linked list of `struct ifaddrs' structures, one for each + network interface on the host machine. If successful, store the + list in *IFAP and return 0. On errors, return -1 and set `errno'. */ +int +__getifaddrs (struct ifaddrs **ifap) +{ + int res; + + do + res = getifaddrs_internal (ifap); + while (res == -EAGAIN); + + return res; +} +weak_alias (__getifaddrs, getifaddrs) +libc_hidden_weak (getifaddrs) + + +void +__freeifaddrs (struct ifaddrs *ifa) +{ + free (ifa); +} +weak_alias (__freeifaddrs, freeifaddrs) +libc_hidden_weak (freeifaddrs) |