diff options
Diffstat (limited to 'net/ethernet/eth.c')
| -rw-r--r-- | net/ethernet/eth.c | 100 |
1 files changed, 69 insertions, 31 deletions
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index 387c71c584e..72bdb15036e 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -64,23 +64,24 @@ __setup("ether=", netdev_boot_setup); -/* - * Create the Ethernet MAC header for an arbitrary protocol layer +/** + * eth_header - create the Ethernet header + * @skb: buffer to alter + * @dev: source device + * @type: Ethernet type field + * @daddr: destination address (NULL leave destination address) + * @saddr: source address (NULL use device source address) + * @len: packet length (<= skb->len) * - * saddr=NULL means use device source address - * daddr=NULL means leave destination address (eg unresolved arp) + * + * Set the protocol type. For a packet of type ETH_P_802_3 we put the length + * in here instead. It is up to the 802.2 layer to carry protocol information. */ - int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len) { struct ethhdr *eth = (struct ethhdr *)skb_push(skb,ETH_HLEN); - /* - * Set the protocol type. For a packet of type ETH_P_802_3 we put the length - * in here instead. It is up to the 802.2 layer to carry protocol information. - */ - if(type!=ETH_P_802_3) eth->h_proto = htons(type); else @@ -113,16 +114,16 @@ int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, return -ETH_HLEN; } - -/* - * Rebuild the Ethernet MAC header. This is called after an ARP - * (or in future other address resolution) has completed on this - * sk_buff. We now let ARP fill in the other fields. +/** + * eth_rebuild_header- rebuild the Ethernet MAC header. + * @skb: socket buffer to update + * + * This is called after an ARP or IPV6 ndisc it's resolution on this + * sk_buff. We now let protocol (ARP) fill in the other fields. * - * This routine CANNOT use cached dst->neigh! - * Really, it is used only when dst->neigh is wrong. + * This routine CANNOT use cached dst->neigh! + * Really, it is used only when dst->neigh is wrong. */ - int eth_rebuild_header(struct sk_buff *skb) { struct ethhdr *eth = (struct ethhdr *)skb->data; @@ -147,12 +148,15 @@ int eth_rebuild_header(struct sk_buff *skb) } -/* - * Determine the packet's protocol ID. The rule here is that we - * assume 802.3 if the type field is short enough to be a length. - * This is normal practice and works for any 'now in use' protocol. +/** + * eth_type_trans - determine the packet's protocol ID. + * @skb: received socket data + * @dev: receiving network device + * + * The rule here is that we + * assume 802.3 if the type field is short enough to be a length. + * This is normal practice and works for any 'now in use' protocol. */ - __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) { struct ethhdr *eth; @@ -202,6 +206,11 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) return htons(ETH_P_802_2); } +/** + * eth_header_parse - extract hardware address from packet + * @skb: packet to extract header from + * @haddr: destination buffer + */ static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr) { struct ethhdr *eth = eth_hdr(skb); @@ -209,6 +218,12 @@ static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr) return ETH_ALEN; } +/** + * eth_header_cache - fill cache entry from neighbour + * @neigh: source neighbour + * @hh: destination cache entry + * Create an Ethernet header template from the neighbour. + */ int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh) { unsigned short type = hh->hh_type; @@ -228,10 +243,14 @@ int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh) return 0; } -/* +/** + * eth_header_cache_update - update cache entry + * @hh: destination cache entry + * @dev: network device + * @haddr: new hardware address + * * Called by Address Resolution module to notify changes in address. */ - void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsigned char * haddr) { memcpy(((u8*)hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), @@ -240,6 +259,15 @@ void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsign EXPORT_SYMBOL(eth_type_trans); +/** + * eth_mac_addr - set new Ethernet hardware address + * @dev: network device + * @p: socket address + * Change hardware address of device. + * + * This doesn't change hardware matching, so needs to be overridden + * for most real devices. + */ static int eth_mac_addr(struct net_device *dev, void *p) { struct sockaddr *addr=p; @@ -249,6 +277,14 @@ static int eth_mac_addr(struct net_device *dev, void *p) return 0; } +/** + * eth_change_mtu - set new MTU size + * @dev: network device + * @new_mtu: new Maximum Transfer Unit + * + * Allow changing MTU size. Needs to be overridden for devices + * supporting jumbo frames. + */ static int eth_change_mtu(struct net_device *dev, int new_mtu) { if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) @@ -257,8 +293,10 @@ static int eth_change_mtu(struct net_device *dev, int new_mtu) return 0; } -/* - * Fill in the fields of the device structure with ethernet-generic values. +/** + * ether_setup - setup Ethernet network device + * @dev: network device + * Fill in the fields of the device structure with Ethernet-generic values. */ void ether_setup(struct net_device *dev) { @@ -283,15 +321,15 @@ void ether_setup(struct net_device *dev) EXPORT_SYMBOL(ether_setup); /** - * alloc_etherdev - Allocates and sets up an ethernet device + * alloc_etherdev - Allocates and sets up an Ethernet device * @sizeof_priv: Size of additional driver-private structure to be allocated - * for this ethernet device + * for this Ethernet device * - * Fill in the fields of the device structure with ethernet-generic + * Fill in the fields of the device structure with Ethernet-generic * values. Basically does everything except registering the device. * * Constructs a new net device, complete with a private data area of - * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for + * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for * this private data area. */ |