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Linux/net/decnet/netfilter/dn_rtmsg.c

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  1 /*
  2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
  3  *              operating system.  DECnet is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              DECnet Routing Message Grabulator
  7  *
  8  *              (C) 2000 ChyGwyn Limited  -  http://www.chygwyn.com/
  9  *              This code may be copied under the GPL v.2 or at your option
 10  *              any later version.
 11  *
 12  * Author:      Steven Whitehouse <steve@chygwyn.com>
 13  *
 14  */
 15 #include <linux/module.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/slab.h>
 18 #include <linux/init.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/netfilter.h>
 21 #include <linux/spinlock.h>
 22 #include <net/netlink.h>
 23 #include <linux/netfilter_decnet.h>
 24 
 25 #include <net/sock.h>
 26 #include <net/flow.h>
 27 #include <net/dn.h>
 28 #include <net/dn_route.h>
 29 
 30 static struct sock *dnrmg = NULL;
 31 
 32 
 33 static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
 34 {
 35         struct sk_buff *skb = NULL;
 36         size_t size;
 37         sk_buff_data_t old_tail;
 38         struct nlmsghdr *nlh;
 39         unsigned char *ptr;
 40         struct nf_dn_rtmsg *rtm;
 41 
 42         size = NLMSG_ALIGN(rt_skb->len) +
 43                NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
 44         skb = nlmsg_new(size, GFP_ATOMIC);
 45         if (!skb) {
 46                 *errp = -ENOMEM;
 47                 return NULL;
 48         }
 49         old_tail = skb->tail;
 50         nlh = nlmsg_put(skb, 0, 0, 0, size, 0);
 51         if (!nlh) {
 52                 kfree_skb(skb);
 53                 *errp = -ENOMEM;
 54                 return NULL;
 55         }
 56         rtm = (struct nf_dn_rtmsg *)nlmsg_data(nlh);
 57         rtm->nfdn_ifindex = rt_skb->dev->ifindex;
 58         ptr = NFDN_RTMSG(rtm);
 59         skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
 60         nlh->nlmsg_len = skb->tail - old_tail;
 61         return skb;
 62 }
 63 
 64 static void dnrmg_send_peer(struct sk_buff *skb)
 65 {
 66         struct sk_buff *skb2;
 67         int status = 0;
 68         int group = 0;
 69         unsigned char flags = *skb->data;
 70 
 71         switch (flags & DN_RT_CNTL_MSK) {
 72         case DN_RT_PKT_L1RT:
 73                 group = DNRNG_NLGRP_L1;
 74                 break;
 75         case DN_RT_PKT_L2RT:
 76                 group = DNRNG_NLGRP_L2;
 77                 break;
 78         default:
 79                 return;
 80         }
 81 
 82         skb2 = dnrmg_build_message(skb, &status);
 83         if (skb2 == NULL)
 84                 return;
 85         NETLINK_CB(skb2).dst_group = group;
 86         netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC);
 87 }
 88 
 89 
 90 static unsigned int dnrmg_hook(void *priv,
 91                         struct sk_buff *skb,
 92                         const struct nf_hook_state *state)
 93 {
 94         dnrmg_send_peer(skb);
 95         return NF_ACCEPT;
 96 }
 97 
 98 
 99 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
100 
101 static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
102 {
103         struct nlmsghdr *nlh = nlmsg_hdr(skb);
104 
105         if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
106                 return;
107 
108         if (!netlink_capable(skb, CAP_NET_ADMIN))
109                 RCV_SKB_FAIL(-EPERM);
110 
111         /* Eventually we might send routing messages too */
112 
113         RCV_SKB_FAIL(-EINVAL);
114 }
115 
116 static struct nf_hook_ops dnrmg_ops __read_mostly = {
117         .hook           = dnrmg_hook,
118         .pf             = NFPROTO_DECNET,
119         .hooknum        = NF_DN_ROUTE,
120         .priority       = NF_DN_PRI_DNRTMSG,
121 };
122 
123 static int __init dn_rtmsg_init(void)
124 {
125         int rv = 0;
126         struct netlink_kernel_cfg cfg = {
127                 .groups = DNRNG_NLGRP_MAX,
128                 .input  = dnrmg_receive_user_skb,
129         };
130 
131         dnrmg = netlink_kernel_create(&init_net, NETLINK_DNRTMSG, &cfg);
132         if (dnrmg == NULL) {
133                 printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket");
134                 return -ENOMEM;
135         }
136 
137         rv = nf_register_hook(&dnrmg_ops);
138         if (rv) {
139                 netlink_kernel_release(dnrmg);
140         }
141 
142         return rv;
143 }
144 
145 static void __exit dn_rtmsg_fini(void)
146 {
147         nf_unregister_hook(&dnrmg_ops);
148         netlink_kernel_release(dnrmg);
149 }
150 
151 
152 MODULE_DESCRIPTION("DECnet Routing Message Grabulator");
153 MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>");
154 MODULE_LICENSE("GPL");
155 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_DNRTMSG);
156 
157 module_init(dn_rtmsg_init);
158 module_exit(dn_rtmsg_fini);
159 
160 

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