cregit-Linux how code gets into the kernel

Release 4.8 net/decnet/netfilter/dn_rtmsg.c

 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *              DECnet Routing Message Grabulator
 *              (C) 2000 ChyGwyn Limited  -
 *              This code may be copied under the GPL v.2 or at your option
 *              any later version.
 * Author:      Steven Whitehouse <>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/spinlock.h>
#include <net/netlink.h>
#include <linux/netfilter_decnet.h>

#include <net/sock.h>
#include <net/flow.h>
#include <net/dn.h>
#include <net/dn_route.h>

static struct sock *dnrmg = NULL;

static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp) { struct sk_buff *skb = NULL; size_t size; sk_buff_data_t old_tail; struct nlmsghdr *nlh; unsigned char *ptr; struct nf_dn_rtmsg *rtm; size = NLMSG_ALIGN(rt_skb->len) + NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg)); skb = nlmsg_new(size, GFP_ATOMIC); if (!skb) { *errp = -ENOMEM; return NULL; } old_tail = skb->tail; nlh = nlmsg_put(skb, 0, 0, 0, size, 0); if (!nlh) { kfree_skb(skb); *errp = -ENOMEM; return NULL; } rtm = (struct nf_dn_rtmsg *)nlmsg_data(nlh); rtm->nfdn_ifindex = rt_skb->dev->ifindex; ptr = NFDN_RTMSG(rtm); skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len); nlh->nlmsg_len = skb->tail - old_tail; return skb; }


steven whitehousesteven whitehouse14276.76%120.00%
david s. millerdavid s. miller3518.92%120.00%
arnaldo carvalho de meloarnaldo carvalho de melo42.16%240.00%
hong zhi guohong zhi guo42.16%120.00%

static void dnrmg_send_peer(struct sk_buff *skb) { struct sk_buff *skb2; int status = 0; int group = 0; unsigned char flags = *skb->data; switch (flags & DN_RT_CNTL_MSK) { case DN_RT_PKT_L1RT: group = DNRNG_NLGRP_L1; break; case DN_RT_PKT_L2RT: group = DNRNG_NLGRP_L2; break; default: return; } skb2 = dnrmg_build_message(skb, &status); if (skb2 == NULL) return; NETLINK_CB(skb2).dst_group = group; netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC); }


steven whitehousesteven whitehouse9797.00%133.33%
andrew mortonandrew morton22.00%133.33%
patrick mchardypatrick mchardy11.00%133.33%

static unsigned int dnrmg_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { dnrmg_send_peer(skb); return NF_ACCEPT; }


steven whitehousesteven whitehouse2376.67%120.00%
herbert xuherbert xu26.67%120.00%
eric w. biedermaneric w. biederman26.67%120.00%
david s. millerdavid s. miller26.67%120.00%
patrick mchardypatrick mchardy13.33%120.00%

#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
static inline void dnrmg_receive_user_skb(struct sk_buff *skb) { struct nlmsghdr *nlh = nlmsg_hdr(skb); if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) return; if (!netlink_capable(skb, CAP_NET_ADMIN)) RCV_SKB_FAIL(-EPERM); /* Eventually we might send routing messages too */ RCV_SKB_FAIL(-EINVAL); }


steven whitehousesteven whitehouse5989.39%125.00%
arnaldo carvalho de meloarnaldo carvalho de melo34.55%125.00%
eric w. biedermaneric w. biederman34.55%125.00%
eric pariseric paris11.52%125.00%

static struct nf_hook_ops dnrmg_ops __read_mostly = { .hook = dnrmg_hook, .pf = NFPROTO_DECNET, .hooknum = NF_DN_ROUTE, .priority = NF_DN_PRI_DNRTMSG, };
static int __init dn_rtmsg_init(void) { int rv = 0; struct netlink_kernel_cfg cfg = { .groups = DNRNG_NLGRP_MAX, .input = dnrmg_receive_user_skb, }; dnrmg = netlink_kernel_create(&init_net, NETLINK_DNRTMSG, &cfg); if (dnrmg == NULL) { printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket"); return -ENOMEM; } rv = nf_register_hook(&dnrmg_ops); if (rv) { netlink_kernel_release(dnrmg); } return rv; }


steven whitehousesteven whitehouse6072.29%120.00%
pablo neira ayusopablo neira ayuso1821.69%120.00%
eric w. biedermaneric w. biederman33.61%120.00%
denis v. lunevdenis v. lunev11.20%120.00%
andrew mortonandrew morton11.20%120.00%

static void __exit dn_rtmsg_fini(void) { nf_unregister_hook(&dnrmg_ops); netlink_kernel_release(dnrmg); }


steven whitehousesteven whitehouse1890.00%133.33%
andrew mortonandrew morton15.00%133.33%
denis v. lunevdenis v. lunev15.00%133.33%

MODULE_DESCRIPTION("DECnet Routing Message Grabulator"); MODULE_AUTHOR("Steven Whitehouse <>"); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_DNRTMSG); module_init(dn_rtmsg_init); module_exit(dn_rtmsg_fini);

Overall Contributors

steven whitehousesteven whitehouse49682.80%14.55%
david s. millerdavid s. miller376.18%29.09%
pablo neira ayusopablo neira ayuso183.01%14.55%
andrew mortonandrew morton91.50%29.09%
eric w. biedermaneric w. biederman81.34%313.64%
arnaldo carvalho de meloarnaldo carvalho de melo71.17%313.64%
harald welteharald welte71.17%14.55%
hong zhi guohong zhi guo50.83%14.55%
patrick mchardypatrick mchardy30.50%313.64%
tejun heotejun heo30.50%14.55%
denis v. lunevdenis v. lunev20.33%14.55%
herbert xuherbert xu20.33%14.55%
alban crequyalban crequy10.17%14.55%
eric pariseric paris10.17%14.55%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.