mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-22 17:55:57 +01:00
56738a1c70
Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it breaks bisects at several points. All bugs will not bisect to this humongous change. It all started with a conversion of the Bash scripts to Python, mainly because I couldn't stand not being able to properly use --options for run which has a million options. Then since that required a full testing, I decided to do all the refactorings that I had in mind at once, and so I did and it became v2-rc. This is the largest patch I have ever done! OMG a few weeks of extra time. I'm never writing a Bash script for anything that starts getting big again. Some of the features are: * separate build-qemu and build-gem5 commands * common: convert scripts to python. Add --option for everything * rename build to build-buildroot now that we are splitting all the build commands, Linux kernel to follow * move all git submodules to submodules/ and all buildroot packages to packages/ * refactor the out/ structure. Keep projects on toplevel, because guest projects separate archs and host ones don't, making a toplevel arch wrong * do-release: rename to just release https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it * run: add --terminal and explain gem5 pdb * just track the lvimrc * store CLI kernel config fragment inside buildlroot to avoid conflicts * gem5: document m5 initparam * readme: make a bunch of things awesomer * readme: fix broken refs * parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c Could not fetch otherwise. * gem5: M5_OVERRIDE_PY_SOURCE
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#netlink-sockets */
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#include <linux/delay.h> /* usleep_range */
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include "netlink.h"
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struct sock *nl_sk = NULL;
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static u32 count;
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static u32 sleep;
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module_param(sleep, int, S_IRUSR | S_IWUSR);
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static void callback(struct sk_buff *skb)
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{
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char readbuf[9];
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size_t readbuflen;
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int pid;
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int res;
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struct nlmsghdr *nlh;
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struct sk_buff *skb_out;
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nlh = (struct nlmsghdr *)skb->data;
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pr_info("kernel received: %s\n", (char *)nlmsg_data(nlh));
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if (sleep)
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usleep_range(1000000, 1000001);
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readbuflen = snprintf(readbuf, sizeof(readbuf), "%x", count);
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count++;
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pid = nlh->nlmsg_pid;
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skb_out = nlmsg_new(readbuflen, 0);
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if (!skb_out) {
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pr_err("nlmsg_new\n");
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return;
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}
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nlh = nlmsg_put(skb_out, 0, 0, NLMSG_DONE, readbuflen, 0);
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NETLINK_CB(skb_out).dst_group = 0;
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strncpy(nlmsg_data(nlh), readbuf, readbuflen);
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res = nlmsg_unicast(nl_sk, skb_out, pid);
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if (res < 0)
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pr_info("nlmsg_unicast\n");
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}
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static int myinit(void)
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{
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struct netlink_kernel_cfg cfg = {
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.input = callback,
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};
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nl_sk = netlink_kernel_create(&init_net, NETLINK_USER, &cfg);
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if (!nl_sk) {
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pr_err("netlink_kernel_create\n");
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return -10;
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}
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return 0;
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}
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static void myexit(void)
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{
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netlink_kernel_release(nl_sk);
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}
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module_init(myinit);
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module_exit(myexit);
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MODULE_LICENSE("GPL");
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