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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 629 | giacomo | 1 | /* Emulates Linux sk buffers using hartik net buffers... */ |
| 2 | |||
| 3 | #include <kernel/kern.h> |
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| 4 | #include <semaphore.h> |
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| 5 | |||
| 6 | #include "../net/netbuff.h" |
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| 7 | #include "../net/eth_priv.h" |
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| 8 | |||
| 9 | #include"linux/skbuff.h" |
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| 10 | |||
| 11 | #define LOWLEV_TX_BUFFERS 50 |
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| 12 | #define LOWLEV_RX_BUFFERS 50 |
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| 13 | struct netbuff rxbuff; |
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| 14 | struct netbuff lowlevel_txbuff; |
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| 15 | |||
| 16 | void skb_init(void) |
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| 17 | { |
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| 18 | netbuff_init(&lowlevel_txbuff, LOWLEV_TX_BUFFERS, ETH_MAX_LEN); |
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| 19 | netbuff_init(&rxbuff, LOWLEV_RX_BUFFERS, ETH_MAX_LEN); |
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| 20 | } |
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| 21 | |||
| 22 | struct sk_buff *dev_alloc_skb(unsigned int len) |
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| 23 | { |
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| 24 | struct sk_buff *skb; |
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| 25 | |||
| 26 | kern_cli(); |
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| 27 | skb = kern_alloc(sizeof(struct sk_buff)); |
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| 28 | kern_sti(); |
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| 29 | |||
| 30 | skb->data = netbuff_get(&rxbuff, NON_BLOCK); |
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| 31 | if (skb->data == NULL) { |
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| 32 | return NULL; |
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| 33 | } |
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| 34 | skb->head = skb->data; |
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| 35 | skb->tail = skb->data; |
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| 36 | skb->len = 0; |
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| 37 | skb->truesize = len; |
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| 38 | |||
| 39 | return skb; |
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| 40 | } |
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| 41 | |||
| 42 | void skb_reserve(struct sk_buff *skb, int len) |
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| 43 | { |
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| 44 | /* changed by PJ ... before it did nothing... */ |
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| 45 | skb->data+=len; |
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| 46 | skb->tail+=len; |
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| 47 | } |
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| 48 | |||
| 49 | unsigned char *skb_put(struct sk_buff *skb, int len) |
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| 50 | { |
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| 51 | unsigned char *tmp=skb->tail; |
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| 52 | |||
| 53 | skb->tail+=len; |
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| 54 | skb->len+=len; |
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| 55 | |||
| 56 | return tmp; |
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| 57 | } |
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| 58 | |||
| 59 | void skb_queue_head_init(struct sk_buff_head *list) |
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| 60 | { |
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| 61 | list->prev = (struct sk_buff *)list; |
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| 62 | list->next = (struct sk_buff *)list; |
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| 63 | list->qlen = 0; |
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| 64 | } |
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| 65 | |||
| 66 | struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, int newheadroom) |
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| 67 | { |
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| 68 | struct sk_buff *n; |
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| 69 | unsigned long offset; |
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| 70 | int headroom = skb_headroom(skb); |
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| 71 | |||
| 72 | /* Allocate the copy buffer */ |
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| 73 | |||
| 74 | n = alloc_skb(skb->truesize + newheadroom-headroom, GFP_ATOMIC); |
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| 75 | if (n == NULL) |
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| 76 | return NULL; |
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| 77 | |||
| 78 | skb_reserve(n, newheadroom); |
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| 79 | |||
| 80 | /* |
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| 81 | * Shift between the two data areas in bytes |
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| 82 | */ |
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| 83 | |||
| 84 | offset = n->data - skb->data; |
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| 85 | |||
| 86 | /* Set the tail pointer and length */ |
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| 87 | skb_put(n, skb->len); |
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| 88 | |||
| 89 | /* Copy the bytes */ |
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| 90 | memcpy(n->data, skb->data, skb->len); |
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| 91 | n->list = NULL; |
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| 92 | // n->sk = NULL; |
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| 93 | // n->priority = skb->priority; |
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| 94 | n->protocol = skb->protocol; |
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| 95 | n->dev = skb->dev; |
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| 96 | // n->dst = dst_clone(skb->dst); |
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| 97 | // n->h.raw = skb->h.raw+offset; |
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| 98 | // n->nh.raw = skb->nh.raw+offset; |
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| 99 | // n->mac.raw = skb->mac.raw+offset; |
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| 100 | memcpy(n->cb, skb->cb, sizeof(skb->cb)); |
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| 101 | n->used = skb->used; |
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| 102 | // n->is_clone = 0; |
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| 103 | // atomic_set(&n->users, 1); |
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| 104 | // n->pkt_type = skb->pkt_type; |
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| 105 | // n->stamp = skb->stamp; |
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| 106 | // n->destructor = NULL; |
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| 107 | // n->security = skb->security; |
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| 108 | #ifdef CONFIG_IP_FIREWALL |
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| 109 | n->fwmark = skb->fwmark; |
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| 110 | #endif |
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| 111 | |||
| 112 | return n; |
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| 113 | } |