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Linux/net/x25/x25_forward.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *      History
  4  *      03-01-2007      Added forwarding for x.25       Andrew Hendry
  5  */
  6 
  7 #define pr_fmt(fmt) "X25: " fmt
  8 
  9 #include <linux/if_arp.h>
 10 #include <linux/init.h>
 11 #include <linux/slab.h>
 12 #include <net/x25.h>
 13 
 14 LIST_HEAD(x25_forward_list);
 15 DEFINE_RWLOCK(x25_forward_list_lock);
 16 
 17 int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
 18                         struct sk_buff *skb, int lci)
 19 {
 20         struct x25_route *rt;
 21         struct x25_neigh *neigh_new = NULL;
 22         struct list_head *entry;
 23         struct x25_forward *x25_frwd, *new_frwd;
 24         struct sk_buff *skbn;
 25         short same_lci = 0;
 26         int rc = 0;
 27 
 28         if ((rt = x25_get_route(dest_addr)) == NULL)
 29                 goto out_no_route;
 30 
 31         if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) {
 32                 /* This shouldn't happen, if it occurs somehow
 33                  * do something sensible
 34                  */
 35                 goto out_put_route;
 36         }
 37 
 38         /* Avoid a loop. This is the normal exit path for a
 39          * system with only one x.25 iface and default route
 40          */
 41         if (rt->dev == from->dev) {
 42                 goto out_put_nb;
 43         }
 44 
 45         /* Remote end sending a call request on an already
 46          * established LCI? It shouldn't happen, just in case..
 47          */
 48         read_lock_bh(&x25_forward_list_lock);
 49         list_for_each(entry, &x25_forward_list) {
 50                 x25_frwd = list_entry(entry, struct x25_forward, node);
 51                 if (x25_frwd->lci == lci) {
 52                         pr_warn("call request for lci which is already registered!, transmitting but not registering new pair\n");
 53                         same_lci = 1;
 54                 }
 55         }
 56         read_unlock_bh(&x25_forward_list_lock);
 57 
 58         /* Save the forwarding details for future traffic */
 59         if (!same_lci){
 60                 if ((new_frwd = kmalloc(sizeof(struct x25_forward),
 61                                                 GFP_ATOMIC)) == NULL){
 62                         rc = -ENOMEM;
 63                         goto out_put_nb;
 64                 }
 65                 new_frwd->lci = lci;
 66                 new_frwd->dev1 = rt->dev;
 67                 new_frwd->dev2 = from->dev;
 68                 write_lock_bh(&x25_forward_list_lock);
 69                 list_add(&new_frwd->node, &x25_forward_list);
 70                 write_unlock_bh(&x25_forward_list_lock);
 71         }
 72 
 73         /* Forward the call request */
 74         if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){
 75                 goto out_put_nb;
 76         }
 77         x25_transmit_link(skbn, neigh_new);
 78         rc = 1;
 79 
 80 
 81 out_put_nb:
 82         x25_neigh_put(neigh_new);
 83 
 84 out_put_route:
 85         x25_route_put(rt);
 86 
 87 out_no_route:
 88         return rc;
 89 }
 90 
 91 
 92 int x25_forward_data(int lci, struct x25_neigh *from, struct sk_buff *skb) {
 93 
 94         struct x25_forward *frwd;
 95         struct list_head *entry;
 96         struct net_device *peer = NULL;
 97         struct x25_neigh *nb;
 98         struct sk_buff *skbn;
 99         int rc = 0;
100 
101         read_lock_bh(&x25_forward_list_lock);
102         list_for_each(entry, &x25_forward_list) {
103                 frwd = list_entry(entry, struct x25_forward, node);
104                 if (frwd->lci == lci) {
105                         /* The call is established, either side can send */
106                         if (from->dev == frwd->dev1) {
107                                 peer = frwd->dev2;
108                         } else {
109                                 peer = frwd->dev1;
110                         }
111                         break;
112                 }
113         }
114         read_unlock_bh(&x25_forward_list_lock);
115 
116         if ( (nb = x25_get_neigh(peer)) == NULL)
117                 goto out;
118 
119         if ( (skbn = pskb_copy(skb, GFP_ATOMIC)) == NULL){
120                 goto output;
121 
122         }
123         x25_transmit_link(skbn, nb);
124 
125         rc = 1;
126 output:
127         x25_neigh_put(nb);
128 out:
129         return rc;
130 }
131 
132 void x25_clear_forward_by_lci(unsigned int lci)
133 {
134         struct x25_forward *fwd, *tmp;
135 
136         write_lock_bh(&x25_forward_list_lock);
137 
138         list_for_each_entry_safe(fwd, tmp, &x25_forward_list, node) {
139                 if (fwd->lci == lci) {
140                         list_del(&fwd->node);
141                         kfree(fwd);
142                 }
143         }
144         write_unlock_bh(&x25_forward_list_lock);
145 }
146 
147 
148 void x25_clear_forward_by_dev(struct net_device *dev)
149 {
150         struct x25_forward *fwd, *tmp;
151 
152         write_lock_bh(&x25_forward_list_lock);
153 
154         list_for_each_entry_safe(fwd, tmp, &x25_forward_list, node) {
155                 if ((fwd->dev1 == dev) || (fwd->dev2 == dev)){
156                         list_del(&fwd->node);
157                         kfree(fwd);
158                 }
159         }
160         write_unlock_bh(&x25_forward_list_lock);
161 }
162 

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