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https://github.com/checkpoint-restore/criu.git
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c237a720b1
If the kernel is misconfigured (say UDP diag module is not set) we should detect such situation and report an error. This patch adds a test for error code. Note the kernel requires a patch as well. Without kernel patch this test do not harm anyway, thus safe to merge. #2412 Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
142 lines
2.9 KiB
C
142 lines
2.9 KiB
C
#include <linux/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <string.h>
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#include <unistd.h>
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#include "libnetlink.h"
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#include "util.h"
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int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
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{
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memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
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while (RTA_OK(rta, len)) {
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if ((rta->rta_type <= max) && (!tb[rta->rta_type]))
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tb[rta->rta_type] = rta;
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rta = RTA_NEXT(rta, len);
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}
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if (len)
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pr_warn("Trimmed RTA: len %d, rta_len %d\n", len, rta->rta_len);
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return 0;
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}
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static int nlmsg_receive(char *buf, int len, int (*cb)(struct nlmsghdr *, void *), void *arg)
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{
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struct nlmsghdr *hdr;
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for (hdr = (struct nlmsghdr *)buf; NLMSG_OK(hdr, len); hdr = NLMSG_NEXT(hdr, len)) {
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if (hdr->nlmsg_seq != CR_NLMSG_SEQ)
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continue;
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if (hdr->nlmsg_type == NLMSG_DONE) {
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int *len = (int *)NLMSG_DATA(hdr);
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if (*len < 0) {
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pr_err("ERROR %d reported by netlink (%s)\n",
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*len, strerror(-*len));
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return -1;
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}
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return 0;
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}
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if (hdr->nlmsg_type == NLMSG_ERROR) {
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struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
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if (hdr->nlmsg_len - sizeof(*hdr) < sizeof(struct nlmsgerr)) {
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pr_err("ERROR truncated\n");
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return -1;
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}
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if (err->error == 0)
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return 0;
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pr_err("ERROR %d reported by netlink\n", -err->error);
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return -1;
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}
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if (cb(hdr, arg))
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return -1;
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}
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return 1;
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}
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int do_rtnl_req(int nl, void *req, int size,
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int (*receive_callback)(struct nlmsghdr *h, void *), void *arg)
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{
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struct msghdr msg;
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struct sockaddr_nl nladdr;
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struct iovec iov;
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static char buf[4096];
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memset(&msg, 0, sizeof(msg));
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msg.msg_name = &nladdr;
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msg.msg_namelen = sizeof(nladdr);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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iov.iov_base = req;
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iov.iov_len = size;
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if (sendmsg(nl, &msg, 0) < 0) {
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pr_perror("Can't send request message");
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goto err;
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}
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iov.iov_base = buf;
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iov.iov_len = sizeof(buf);
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while (1) {
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int err;
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memset(&msg, 0, sizeof(msg));
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msg.msg_name = &nladdr;
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msg.msg_namelen = sizeof(nladdr);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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err = recvmsg(nl, &msg, 0);
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if (err < 0) {
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if (errno == EINTR)
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continue;
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else {
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pr_perror("Error receiving nl report");
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goto err;
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}
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}
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if (err == 0)
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break;
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err = nlmsg_receive(buf, err, receive_callback, arg);
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if (err < 0)
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goto err;
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if (err == 0)
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break;
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}
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return 0;
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err:
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return -1;
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}
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int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
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int alen)
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{
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int len = RTA_LENGTH(alen);
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struct rtattr *rta;
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if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
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pr_err("addattr_l ERROR: message exceeded bound of %d\n", maxlen);
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return -1;
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}
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rta = NLMSG_TAIL(n);
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rta->rta_type = type;
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rta->rta_len = len;
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memcpy(RTA_DATA(rta), data, alen);
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n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
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return 0;
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}
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