+++ /dev/null
-/*
- * libnetlink.c RTnetlink service routines.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <syslog.h>
-#include <fcntl.h>
-#include <net/if_arp.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <string.h>
-#include <errno.h>
-#include <time.h>
-#include <sys/uio.h>
-
-#include "libnetlink.h"
-
-void rtnl_close(struct rtnl_handle *rth)
-{
- close(rth->fd);
-}
-
-int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
- int protocol)
-{
- socklen_t addr_len;
- int sndbuf = 32768;
- int rcvbuf = 32768;
-
- memset(rth, 0, sizeof(rth));
-
- rth->fd = socket(AF_NETLINK, SOCK_RAW, protocol);
- if (rth->fd < 0) {
- perror("Cannot open netlink socket");
- return -1;
- }
-
- if (setsockopt(rth->fd,SOL_SOCKET,SO_SNDBUF,&sndbuf,sizeof(sndbuf)) < 0) {
- perror("SO_SNDBUF");
- return -1;
- }
-
- if (setsockopt(rth->fd,SOL_SOCKET,SO_RCVBUF,&rcvbuf,sizeof(rcvbuf)) < 0) {
- perror("SO_RCVBUF");
- return -1;
- }
-
- memset(&rth->local, 0, sizeof(rth->local));
- rth->local.nl_family = AF_NETLINK;
- rth->local.nl_groups = subscriptions;
-
- if (bind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)) < 0) {
- perror("Cannot bind netlink socket");
- return -1;
- }
- addr_len = sizeof(rth->local);
- if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) {
- perror("Cannot getsockname");
- return -1;
- }
- if (addr_len != sizeof(rth->local)) {
- fprintf(stderr, "Wrong address length %d\n", addr_len);
- return -1;
- }
- if (rth->local.nl_family != AF_NETLINK) {
- fprintf(stderr, "Wrong address family %d\n", rth->local.nl_family);
- return -1;
- }
- rth->seq = time(NULL);
- return 0;
-}
-
-int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
-{
- return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
-}
-
-int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
-{
- struct {
- struct nlmsghdr nlh;
- struct rtgenmsg g;
- } req;
- struct sockaddr_nl nladdr;
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
-
- memset(&req, 0, sizeof(req));
- 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 = rth->dump = ++rth->seq;
- req.g.rtgen_family = family;
-
- return sendto(rth->fd, (void*)&req, sizeof(req), 0,
- (struct sockaddr*)&nladdr, sizeof(nladdr));
-}
-
-int rtnl_send(struct rtnl_handle *rth, const char *buf, int len)
-{
- struct sockaddr_nl nladdr;
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
-
- return sendto(rth->fd, buf, len, 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
-}
-
-int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
-{
- struct nlmsghdr nlh;
- struct sockaddr_nl nladdr;
- struct iovec iov[2] = {
- { .iov_base = &nlh, .iov_len = sizeof(nlh) },
- { .iov_base = req, .iov_len = len }
- };
- struct msghdr msg = {
- .msg_name = &nladdr,
- .msg_namelen = sizeof(nladdr),
- .msg_iov = iov,
- .msg_iovlen = 2,
- };
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
-
- nlh.nlmsg_len = NLMSG_LENGTH(len);
- nlh.nlmsg_type = type;
- nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
- nlh.nlmsg_pid = 0;
- nlh.nlmsg_seq = rth->dump = ++rth->seq;
-
- return sendmsg(rth->fd, &msg, 0);
-}
-
-int rtnl_dump_filter(struct rtnl_handle *rth,
- rtnl_filter_t filter,
- void *arg1,
- rtnl_filter_t junk,
- void *arg2)
-{
- struct sockaddr_nl nladdr;
- struct iovec iov;
- struct msghdr msg = {
- .msg_name = &nladdr,
- .msg_namelen = sizeof(nladdr),
- .msg_iov = &iov,
- .msg_iovlen = 1,
- };
- char buf[16384];
-
- iov.iov_base = buf;
- while (1) {
- int status;
- struct nlmsghdr *h;
-
- iov.iov_len = sizeof(buf);
- status = recvmsg(rth->fd, &msg, 0);
-
- if (status < 0) {
- if (errno == EINTR)
- continue;
- perror("OVERRUN");
- continue;
- }
-
- if (status == 0) {
- fprintf(stderr, "EOF on netlink\n");
- return -1;
- }
-
- h = (struct nlmsghdr*)buf;
- while (NLMSG_OK(h, status)) {
- int err;
-
- if (nladdr.nl_pid != 0 ||
- h->nlmsg_pid != rth->local.nl_pid ||
- h->nlmsg_seq != rth->dump) {
- if (junk) {
- err = junk(&nladdr, h, arg2);
- if (err < 0)
- return err;
- }
- goto skip_it;
- }
-
- if (h->nlmsg_type == NLMSG_DONE)
- return 0;
- if (h->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
- if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
- fprintf(stderr, "ERROR truncated\n");
- } else {
- errno = -err->error;
- perror("RTNETLINK answers");
- }
- return -1;
- }
- err = filter(&nladdr, h, arg1);
- if (err < 0)
- return err;
-
-skip_it:
- h = NLMSG_NEXT(h, status);
- }
- if (msg.msg_flags & MSG_TRUNC) {
- fprintf(stderr, "Message truncated\n");
- continue;
- }
- if (status) {
- fprintf(stderr, "!!!Remnant of size %d\n", status);
- exit(1);
- }
- }
-}
-
-int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
- unsigned groups, struct nlmsghdr *answer,
- rtnl_filter_t junk,
- void *jarg)
-{
- int status;
- unsigned seq;
- struct nlmsghdr *h;
- struct sockaddr_nl nladdr;
- struct iovec iov = {
- .iov_base = (void*) n,
- .iov_len = n->nlmsg_len
- };
- struct msghdr msg = {
- .msg_name = &nladdr,
- .msg_namelen = sizeof(nladdr),
- .msg_iov = &iov,
- .msg_iovlen = 1,
- };
- char buf[16384];
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = peer;
- nladdr.nl_groups = groups;
-
- n->nlmsg_seq = seq = ++rtnl->seq;
-
- if (answer == NULL)
- n->nlmsg_flags |= NLM_F_ACK;
-
- status = sendmsg(rtnl->fd, &msg, 0);
-
- if (status < 0) {
- perror("Cannot talk to rtnetlink");
- return -1;
- }
-
- memset(buf,0,sizeof(buf));
-
- iov.iov_base = buf;
-
- while (1) {
- iov.iov_len = sizeof(buf);
- status = recvmsg(rtnl->fd, &msg, 0);
-
- if (status < 0) {
- if (errno == EINTR)
- continue;
- perror("OVERRUN");
- continue;
- }
- if (status == 0) {
- fprintf(stderr, "EOF on netlink\n");
- return -1;
- }
- if (msg.msg_namelen != sizeof(nladdr)) {
- fprintf(stderr, "sender address length == %d\n", msg.msg_namelen);
- exit(1);
- }
- for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
- int err;
- int len = h->nlmsg_len;
- int l = len - sizeof(*h);
-
- if (l<0 || len>status) {
- if (msg.msg_flags & MSG_TRUNC) {
- fprintf(stderr, "Truncated message\n");
- return -1;
- }
- fprintf(stderr, "!!!malformed message: len=%d\n", len);
- exit(1);
- }
-
- if (nladdr.nl_pid != peer ||
- h->nlmsg_pid != rtnl->local.nl_pid ||
- h->nlmsg_seq != seq) {
- if (junk) {
- err = junk(&nladdr, h, jarg);
- if (err < 0)
- return err;
- }
- /* Don't forget to skip that message. */
- status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
- continue;
- }
-
- if (h->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
- if (l < sizeof(struct nlmsgerr)) {
- fprintf(stderr, "ERROR truncated\n");
- } else {
- errno = -err->error;
- if (errno == 0) {
- if (answer)
- memcpy(answer, h, h->nlmsg_len);
- return 0;
- }
- perror("RTNETLINK answers");
- }
- return -1;
- }
- if (answer) {
- memcpy(answer, h, h->nlmsg_len);
- return 0;
- }
-
- fprintf(stderr, "Unexpected reply!!!\n");
-
- status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
- }
- if (msg.msg_flags & MSG_TRUNC) {
- fprintf(stderr, "Message truncated\n");
- continue;
- }
- if (status) {
- fprintf(stderr, "!!!Remnant of size %d\n", status);
- exit(1);
- }
- }
-}
-
-int rtnl_listen(struct rtnl_handle *rtnl,
- rtnl_filter_t handler,
- void *jarg)
-{
- int status;
- struct nlmsghdr *h;
- struct sockaddr_nl nladdr;
- struct iovec iov;
- struct msghdr msg = {
- .msg_name = &nladdr,
- .msg_namelen = sizeof(nladdr),
- .msg_iov = &iov,
- .msg_iovlen = 1,
- };
- char buf[8192];
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = 0;
- nladdr.nl_groups = 0;
-
- iov.iov_base = buf;
- while (1) {
- iov.iov_len = sizeof(buf);
- status = recvmsg(rtnl->fd, &msg, 0);
-
- if (status < 0) {
- if (errno == EINTR)
- continue;
- perror("OVERRUN");
- continue;
- }
- if (status == 0) {
- fprintf(stderr, "EOF on netlink\n");
- return -1;
- }
- if (msg.msg_namelen != sizeof(nladdr)) {
- fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen);
- exit(1);
- }
- for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
- int err;
- int len = h->nlmsg_len;
- int l = len - sizeof(*h);
-
- if (l<0 || len>status) {
- if (msg.msg_flags & MSG_TRUNC) {
- fprintf(stderr, "Truncated message\n");
- return -1;
- }
- fprintf(stderr, "!!!malformed message: len=%d\n", len);
- exit(1);
- }
-
- err = handler(&nladdr, h, jarg);
- if (err < 0)
- return err;
-
- status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
- }
- if (msg.msg_flags & MSG_TRUNC) {
- fprintf(stderr, "Message truncated\n");
- continue;
- }
- if (status) {
- fprintf(stderr, "!!!Remnant of size %d\n", status);
- exit(1);
- }
- }
-}
-
-int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
- void *jarg)
-{
- int status;
- struct sockaddr_nl nladdr;
- char buf[8192];
- struct nlmsghdr *h = (void*)buf;
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = 0;
- nladdr.nl_groups = 0;
-
- while (1) {
- int err, len, type;
- int l;
-
- status = fread(&buf, 1, sizeof(*h), rtnl);
-
- if (status < 0) {
- if (errno == EINTR)
- continue;
- perror("rtnl_from_file: fread");
- return -1;
- }
- if (status == 0)
- return 0;
-
- len = h->nlmsg_len;
- type= h->nlmsg_type;
- l = len - sizeof(*h);
-
- if (l<0 || len>sizeof(buf)) {
- fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
- len, ftell(rtnl));
- return -1;
- }
-
- status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl);
-
- if (status < 0) {
- perror("rtnl_from_file: fread");
- return -1;
- }
- if (status < l) {
- fprintf(stderr, "rtnl-from_file: truncated message\n");
- return -1;
- }
-
- err = handler(&nladdr, h, jarg);
- if (err < 0)
- return err;
- }
-}
-
-int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
-{
- int len = RTA_LENGTH(4);
- struct rtattr *rta;
- if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) {
- fprintf(stderr,"addattr32: Error! max allowed bound %d exceeded\n",maxlen);
- return -1;
- }
- rta = NLMSG_TAIL(n);
- rta->rta_type = type;
- rta->rta_len = len;
- memcpy(RTA_DATA(rta), &data, 4);
- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
- return 0;
-}
-
-int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
- int alen)
-{
- int len = RTA_LENGTH(alen);
- struct rtattr *rta;
-
- if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
- fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen);
- return -1;
- }
- rta = NLMSG_TAIL(n);
- rta->rta_type = type;
- rta->rta_len = len;
- memcpy(RTA_DATA(rta), data, alen);
- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
- return 0;
-}
-
-int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
-{
- if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
- fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen);
- return -1;
- }
-
- memcpy(NLMSG_TAIL(n), data, len);
- memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
- return 0;
-}
-
-int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
-{
- int len = RTA_LENGTH(4);
- struct rtattr *subrta;
-
- if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
- fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",maxlen);
- return -1;
- }
- subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
- subrta->rta_type = type;
- subrta->rta_len = len;
- memcpy(RTA_DATA(subrta), &data, 4);
- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
- return 0;
-}
-
-int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
- const void *data, int alen)
-{
- struct rtattr *subrta;
- int len = RTA_LENGTH(alen);
-
- if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
- fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",maxlen);
- return -1;
- }
- subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
- subrta->rta_type = type;
- subrta->rta_len = len;
- memcpy(RTA_DATA(subrta), data, alen);
- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
- return 0;
-}
-
-int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
-{
- memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
- while (RTA_OK(rta, len)) {
- if (rta->rta_type <= max)
- tb[rta->rta_type] = rta;
- rta = RTA_NEXT(rta,len);
- }
- if (len)
- fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
- return 0;
-}
-
-int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len)
-{
- int i = 0;
-
- memset(tb, 0, sizeof(struct rtattr *) * max);
- while (RTA_OK(rta, len)) {
- if (rta->rta_type <= max && i < max)
- tb[i++] = rta;
- rta = RTA_NEXT(rta,len);
- }
- if (len)
- fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
- return i;
-}
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