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net/x25/x25_dev.c
4.41 KB
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/* * X.25 Packet Layer release 002 * |
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* This is ALPHA test software. This code may break your machine, randomly fail to work with new * releases, misbehave and/or generally screw up. It might even work. |
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* * This code REQUIRES 2.1.15 or higher * * This module: * This module is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * History * X.25 001 Jonathan Naylor Started coding. * 2000-09-04 Henner Eisen Prevent freeing a dangling skb. */ |
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#define pr_fmt(fmt) "X25: " fmt |
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#include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> #include <linux/if_arp.h> #include <net/x25.h> |
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#include <net/x25device.h> |
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static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb) { struct sock *sk; unsigned short frametype; unsigned int lci; |
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if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) return 0; |
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frametype = skb->data[2]; |
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lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); |
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/* * LCI of zero is always for us, and its always a link control * frame. */ if (lci == 0) { x25_link_control(skb, nb, frametype); return 0; } /* * Find an existing socket. */ if ((sk = x25_find_socket(lci, nb)) != NULL) { int queued = 1; |
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skb_reset_transport_header(skb); |
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bh_lock_sock(sk); if (!sock_owned_by_user(sk)) { queued = x25_process_rx_frame(sk, skb); } else { |
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queued = !sk_add_backlog(sk, skb, sk->sk_rcvbuf); |
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} bh_unlock_sock(sk); |
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sock_put(sk); |
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return queued; } /* * Is is a Call Request ? if so process it. */ if (frametype == X25_CALL_REQUEST) return x25_rx_call_request(skb, nb, lci); /* |
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* Its not a Call Request, nor is it a control frame. * Can we forward it? |
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*/ |
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if (x25_forward_data(lci, nb, skb)) { if (frametype == X25_CLEAR_CONFIRMATION) { x25_clear_forward_by_lci(lci); } kfree_skb(skb); return 1; } |
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/* x25_transmit_clear_request(nb, lci, 0x0D); */ if (frametype != X25_CLEAR_CONFIRMATION) |
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pr_debug("x25_receive_data(): unknown frame type %2x ",frametype); |
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return 0; } int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev, |
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struct packet_type *ptype, struct net_device *orig_dev) |
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{ struct sk_buff *nskb; struct x25_neigh *nb; |
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if (!net_eq(dev_net(dev), &init_net)) |
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goto drop; |
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nskb = skb_copy(skb, GFP_ATOMIC); if (!nskb) goto drop; kfree_skb(skb); skb = nskb; /* * Packet received from unrecognised device, throw it away. */ nb = x25_get_neigh(dev); if (!nb) { |
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pr_debug("unknown neighbour - %s ", dev->name); |
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goto drop; } |
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if (!pskb_may_pull(skb, 1)) return 0; |
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switch (skb->data[0]) { |
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case X25_IFACE_DATA: skb_pull(skb, 1); if (x25_receive_data(skb, nb)) { x25_neigh_put(nb); goto out; } break; case X25_IFACE_CONNECT: x25_link_established(nb); break; case X25_IFACE_DISCONNECT: x25_link_terminated(nb); break; |
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} x25_neigh_put(nb); drop: kfree_skb(skb); out: return 0; } void x25_establish_link(struct x25_neigh *nb) { struct sk_buff *skb; unsigned char *ptr; switch (nb->dev->type) { |
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case ARPHRD_X25: if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) { |
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pr_err("x25_dev: out of memory "); |
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return; } ptr = skb_put(skb, 1); *ptr = X25_IFACE_CONNECT; break; |
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#if IS_ENABLED(CONFIG_LLC) |
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case ARPHRD_ETHER: return; |
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#endif |
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default: return; |
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} skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); } void x25_terminate_link(struct x25_neigh *nb) { struct sk_buff *skb; unsigned char *ptr; |
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#if IS_ENABLED(CONFIG_LLC) |
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if (nb->dev->type == ARPHRD_ETHER) return; #endif if (nb->dev->type != ARPHRD_X25) return; skb = alloc_skb(1, GFP_ATOMIC); if (!skb) { |
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pr_err("x25_dev: out of memory "); |
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return; } ptr = skb_put(skb, 1); |
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*ptr = X25_IFACE_DISCONNECT; |
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skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); } void x25_send_frame(struct sk_buff *skb, struct x25_neigh *nb) { unsigned char *dptr; |
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skb_reset_network_header(skb); |
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switch (nb->dev->type) { |
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case ARPHRD_X25: dptr = skb_push(skb, 1); *dptr = X25_IFACE_DATA; break; |
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#if IS_ENABLED(CONFIG_LLC) |
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case ARPHRD_ETHER: kfree_skb(skb); return; |
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#endif |
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default: kfree_skb(skb); return; |
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} skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); } |