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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | #include <linux/module.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <net/datalink.h> #include <linux/mm.h> #include <linux/in.h> #include <net/p8022tr.h> #define SNAP_HEADER_LEN 8 static struct datalink_proto *p8022tr_list = NULL; /* * We don't handle the loopback SAP stuff, the extended * 802.2 command set, multicast SAP identifiers and non UI * frames. We have the absolute minimum needed for IPX, * IP and Appletalk phase 2. */ static struct datalink_proto * find_8022tr_client(unsigned char type) { struct datalink_proto *proto; for (proto = p8022tr_list; ((proto != NULL) && (*(proto->type) != type)); proto = proto->next) ; return proto; } int p8022tr_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt) { struct datalink_proto *proto; proto = find_8022tr_client(*(skb->h.raw)); if (proto != NULL) { skb->h.raw += 3; skb_pull(skb,3); return proto->rcvfunc(skb, dev, pt); } skb->sk = NULL; kfree_skb(skb, FREE_READ); return 0; } static void p8022tr_datalink_header(struct datalink_proto *dl, struct sk_buff *skb, unsigned char *dest_node) { struct device *dev = skb->dev; unsigned char *rawp; unsigned char *olddata; unsigned char *newdata; rawp = skb_push(skb,3); *rawp++ = dl->type[0]; *rawp++ = dl->type[0]; *rawp = 0x03; /* UI */ dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len); olddata = skb->data; newdata = skb_pull(skb, SNAP_HEADER_LEN); memmove(newdata, olddata, dev->hard_header_len - SNAP_HEADER_LEN); } static struct packet_type p8022tr_packet_type = { 0, NULL, /* All devices */ p8022tr_rcv, NULL, NULL, }; static struct symbol_table p8022tr_proto_syms = { #include <linux/symtab_begin.h> X(register_8022tr_client), X(unregister_8022tr_client), #include <linux/symtab_end.h> }; void p8022tr_proto_init(struct net_proto *pro) { p8022tr_packet_type.type=htons(ETH_P_TR_802_2); dev_add_pack(&p8022tr_packet_type); register_symtab(&p8022tr_proto_syms); } struct datalink_proto * register_8022tr_client(unsigned char type, int (*rcvfunc)(struct sk_buff *, struct device *, struct packet_type *)) { struct datalink_proto *proto; if (find_8022tr_client(type) != NULL) return NULL; proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC); if (proto != NULL) { proto->type[0] = type; proto->type_len = 1; proto->rcvfunc = rcvfunc; proto->header_length = 3; proto->datalink_header = p8022tr_datalink_header; proto->string_name = "802.2TR"; proto->next = p8022tr_list; p8022tr_list = proto; } return proto; } void unregister_8022tr_client(unsigned char type) { struct datalink_proto *tmp, **clients = &p8022tr_list; unsigned long flags; save_flags(flags); cli(); while ((tmp = *clients) != NULL) { if (tmp->type[0] == type) { *clients = tmp->next; kfree_s(tmp, sizeof(struct datalink_proto)); break; } else { clients = &tmp->next; } } restore_flags(flags); } |