/* * netsniff-ng - the packet sniffing beast * Copyright (C) 2012 Christoph Jaeger * Subject to the GPL, version 2. */ #ifndef PKT_BUFF_H #define PKT_BUFF_H #include "hash.h" #include "built_in.h" #include "proto.h" #include "xmalloc.h" struct pkt_buff { /* invariant: head <= data <= tail */ uint8_t *head; uint8_t *data; uint8_t *tail; struct protocol *dissector; uint32_t link_type; struct sockaddr_ll *sll; }; static inline struct pkt_buff *pkt_alloc(uint8_t *packet, unsigned int len) { struct pkt_buff *pkt = xmalloc(sizeof(*pkt)); pkt->head = packet; pkt->data = packet; pkt->tail = packet + len; pkt->dissector = NULL; return pkt; } static inline void pkt_free(struct pkt_buff *pkt) { xfree(pkt); } static inline unsigned int pkt_len(struct pkt_buff *pkt) { bug_on(!pkt || pkt->data > pkt->tail); return pkt->tail - pkt->data; } static inline uint8_t *pkt_pull(struct pkt_buff *pkt, unsigned int len) { uint8_t *data = NULL; bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); if (len <= pkt_len(pkt)) { data = pkt->data; pkt->data += len; } bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); return data; } static inline uint8_t *pkt_peek(struct pkt_buff *pkt) { bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); return pkt->data; } static inline unsigned int pkt_trim(struct pkt_buff *pkt, unsigned int len) { unsigned int ret = 0; bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); if (len <= pkt_len(pkt)) ret = len; pkt->tail -= ret; bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); return ret; } static inline uint8_t *pkt_pull_tail(struct pkt_buff *pkt, unsigned int len) { uint8_t *tail = NULL; bug_on(!pkt || pkt->head > pkt->data || pkt->data > pkt->tail); if (len <= pkt_len(pkt)) { tail = pkt->tail; pkt->tail -= len; } return tail; } static inline void pkt_set_dissector(struct pkt_buff *pkt, struct hash_table *table, unsigned int key) { bug_on(!pkt || !table); pkt->dissector = lookup_hash(key, table); while (pkt->dissector && key != pkt->dissector->key) pkt->dissector = pkt->dissector->next; } #endif /* PKT_BUFF_H */ td class='form'>
path: root/drivers/usb/gadget/function/uvc.h
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authorDavid S. Miller <davem@davemloft.net>2017-02-02 16:54:00 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-02 16:54:00 -0500
commite2160156bf2a7d5018e99a9993fbcdda0abac09b (patch)
tree1a70cb13dcfa7ade4c48d8a64d20543abebfb1dc /drivers/usb/gadget/function/uvc.h
parent62e13097c46c69dbd7544ab2cd585ccf48f360a4 (diff)
parent6d04dfc8966019b8b0977b2cb942351f13d2b178 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
All merge conflicts were simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/usb/gadget/function/uvc.h')