int ax25_rebuild_header(struct sk_buff *skb) { struct sk_buff *ourskb; unsigned char *bp = skb->data; ax25_route *route; struct net_device *dev = NULL; ax25_address *src, *dst; ax25_digi *digipeat = NULL; ax25_dev *ax25_dev; ax25_cb *ax25; char ip_mode = ' '; dst = (ax25_address *)(bp + 1); src = (ax25_address *)(bp + 8); if (arp_find(bp + 1, skb)) return 1; route = ax25_get_route(dst, NULL); if (route) { digipeat = route->digipeat; dev = route->dev; ip_mode = route->ip_mode; } if (dev == NULL) dev = skb->dev; if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) { goto put; } if (bp[16] == AX25_P_IP) { if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) { /* * We copy the buffer and release the original thereby * keeping it straight * * Note: we report 1 back so the caller will * not feed the frame direct to the physical device * We don't want that to happen. (It won't be upset * as we have pulled the frame from the queue by * freeing it). * * NB: TCP modifies buffers that are still * on a device queue, thus we use skb_copy() * instead of using skb_clone() unless this * gets fixed. */ ax25_address src_c; ax25_address dst_c; if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) { kfree_skb(skb); goto put; } if (skb->sk != NULL) skb_set_owner_w(ourskb, skb->sk); kfree_skb(skb); /* dl9sau: bugfix * after kfree_skb(), dst and src which were pointer * to bp which is part of skb->data would not be valid * anymore hope that after skb_pull(ourskb, ..) our * dsc_c and src_c will not become invalid */ bp = ourskb->data; dst_c = *(ax25_address *)(bp + 1); src_c = *(ax25_address *)(bp + 8); skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */ skb_reset_network_header(ourskb); ax25=ax25_send_frame( ourskb, ax25_dev->values[AX25_VALUES_PACLEN], &src_c, &dst_c, digipeat, dev); if (ax25) { ax25_cb_put(ax25); } goto put; } } bp[7] &= ~AX25_CBIT; bp[7] &= ~AX25_EBIT; bp[7] |= AX25_SSSID_SPARE; bp[14] &= ~AX25_CBIT; bp[14] |= AX25_EBIT; bp[14] |= AX25_SSSID_SPARE; skb_pull(skb, AX25_KISS_HEADER_LEN); if (digipeat != NULL) { if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) { kfree_skb(skb); goto put; } skb = ourskb; } ax25_queue_xmit(skb, dev); put: if (route) ax25_put_route(route); return 1; }
int ax25_rebuild_header(struct sk_buff *skb) { struct sk_buff *ourskb; unsigned char *bp = skb->data; ax25_route *route; struct net_device *dev = NULL; ax25_address *src, *dst; ax25_digi *digipeat = NULL; ax25_dev *ax25_dev; ax25_cb *ax25; char ip_mode = ' '; dst = (ax25_address *)(bp + 1); src = (ax25_address *)(bp + 8); if (arp_find(bp + 1, skb)) return 1; route = ax25_get_route(dst, NULL); if (route) { digipeat = route->digipeat; dev = route->dev; ip_mode = route->ip_mode; } if (dev == NULL) dev = skb->dev; if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) { goto put; } if (bp[16] == AX25_P_IP) { if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) { ax25_address src_c; ax25_address dst_c; if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) { kfree_skb(skb); goto put; } if (skb->sk != NULL) skb_set_owner_w(ourskb, skb->sk); kfree_skb(skb); bp = ourskb->data; dst_c = *(ax25_address *)(bp + 1); src_c = *(ax25_address *)(bp + 8); skb_pull(ourskb, AX25_HEADER_LEN - 1); skb_reset_network_header(ourskb); ax25=ax25_send_frame( ourskb, ax25_dev->values[AX25_VALUES_PACLEN], &src_c, &dst_c, digipeat, dev); if (ax25) { ax25_cb_put(ax25); } goto put; } } bp[7] &= ~AX25_CBIT; bp[7] &= ~AX25_EBIT; bp[7] |= AX25_SSSID_SPARE; bp[14] &= ~AX25_CBIT; bp[14] |= AX25_EBIT; bp[14] |= AX25_SSSID_SPARE; skb_pull(skb, AX25_KISS_HEADER_LEN); if (digipeat != NULL) { if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) { kfree_skb(skb); goto put; } skb = ourskb; } ax25_queue_xmit(skb, dev); put: if (route) ax25_put_route(route); return 1; }