skbuff.h (2fe5de9ce7d57498abc14b375cad2fcf8c3ee6cc) skbuff.h (60ff746739bf805a912484643c720b6124826140)
1/*
2 * Definitions for the 'struct sk_buff' memory handlers.
3 *
4 * Authors:
5 * Alan Cox, <gw4pts@gw4pts.ampr.org>
6 * Florian La Roche, <rzsfl@rz.uni-sb.de>
7 *
8 * This program is free software; you can redistribute it and/or

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421 * @len: Length of actual data
422 * @data_len: Data length
423 * @mac_len: Length of link layer header
424 * @hdr_len: writable header length of cloned skb
425 * @csum: Checksum (must include start/offset pair)
426 * @csum_start: Offset from skb->head where checksumming should start
427 * @csum_offset: Offset from csum_start where checksum should be stored
428 * @priority: Packet queueing priority
1/*
2 * Definitions for the 'struct sk_buff' memory handlers.
3 *
4 * Authors:
5 * Alan Cox, <gw4pts@gw4pts.ampr.org>
6 * Florian La Roche, <rzsfl@rz.uni-sb.de>
7 *
8 * This program is free software; you can redistribute it and/or

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421 * @len: Length of actual data
422 * @data_len: Data length
423 * @mac_len: Length of link layer header
424 * @hdr_len: writable header length of cloned skb
425 * @csum: Checksum (must include start/offset pair)
426 * @csum_start: Offset from skb->head where checksumming should start
427 * @csum_offset: Offset from csum_start where checksum should be stored
428 * @priority: Packet queueing priority
429 * @local_df: allow local fragmentation
429 * @ignore_df: allow local fragmentation
430 * @cloned: Head may be cloned (check refcnt to be sure)
431 * @ip_summed: Driver fed us an IP checksum
432 * @nohdr: Payload reference only, must not modify header
433 * @nfctinfo: Relationship of this skb to the connection
434 * @pkt_type: Packet class
435 * @fclone: skbuff clone status
436 * @ipvs_property: skbuff is owned by ipvs
437 * @peeked: this packet has been seen already, so stats have been

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509 __wsum csum;
510 struct {
511 __u16 csum_start;
512 __u16 csum_offset;
513 };
514 };
515 __u32 priority;
516 kmemcheck_bitfield_begin(flags1);
430 * @cloned: Head may be cloned (check refcnt to be sure)
431 * @ip_summed: Driver fed us an IP checksum
432 * @nohdr: Payload reference only, must not modify header
433 * @nfctinfo: Relationship of this skb to the connection
434 * @pkt_type: Packet class
435 * @fclone: skbuff clone status
436 * @ipvs_property: skbuff is owned by ipvs
437 * @peeked: this packet has been seen already, so stats have been

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509 __wsum csum;
510 struct {
511 __u16 csum_start;
512 __u16 csum_offset;
513 };
514 };
515 __u32 priority;
516 kmemcheck_bitfield_begin(flags1);
517 __u8 local_df:1,
517 __u8 ignore_df:1,
518 cloned:1,
519 ip_summed:2,
520 nohdr:1,
521 nfctinfo:3;
522 __u8 pkt_type:3,
523 fclone:2,
524 ipvs_property:1,
525 peeked:1,

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2736 * hardware has already verified the correctness of the checksum.
2737 */
2738static inline __sum16 skb_checksum_complete(struct sk_buff *skb)
2739{
2740 return skb_csum_unnecessary(skb) ?
2741 0 : __skb_checksum_complete(skb);
2742}
2743
518 cloned:1,
519 ip_summed:2,
520 nohdr:1,
521 nfctinfo:3;
522 __u8 pkt_type:3,
523 fclone:2,
524 ipvs_property:1,
525 peeked:1,

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2736 * hardware has already verified the correctness of the checksum.
2737 */
2738static inline __sum16 skb_checksum_complete(struct sk_buff *skb)
2739{
2740 return skb_csum_unnecessary(skb) ?
2741 0 : __skb_checksum_complete(skb);
2742}
2743
2744/* Check if we need to perform checksum complete validation.
2745 *
2746 * Returns true if checksum complete is needed, false otherwise
2747 * (either checksum is unnecessary or zero checksum is allowed).
2748 */
2749static inline bool __skb_checksum_validate_needed(struct sk_buff *skb,
2750 bool zero_okay,
2751 __sum16 check)
2752{
2753 if (skb_csum_unnecessary(skb)) {
2754 return false;
2755 } else if (zero_okay && !check) {
2756 skb->ip_summed = CHECKSUM_UNNECESSARY;
2757 return false;
2758 }
2759
2760 return true;
2761}
2762
2763/* For small packets <= CHECKSUM_BREAK peform checksum complete directly
2764 * in checksum_init.
2765 */
2766#define CHECKSUM_BREAK 76
2767
2768/* Validate (init) checksum based on checksum complete.
2769 *
2770 * Return values:
2771 * 0: checksum is validated or try to in skb_checksum_complete. In the latter
2772 * case the ip_summed will not be CHECKSUM_UNNECESSARY and the pseudo
2773 * checksum is stored in skb->csum for use in __skb_checksum_complete
2774 * non-zero: value of invalid checksum
2775 *
2776 */
2777static inline __sum16 __skb_checksum_validate_complete(struct sk_buff *skb,
2778 bool complete,
2779 __wsum psum)
2780{
2781 if (skb->ip_summed == CHECKSUM_COMPLETE) {
2782 if (!csum_fold(csum_add(psum, skb->csum))) {
2783 skb->ip_summed = CHECKSUM_UNNECESSARY;
2784 return 0;
2785 }
2786 }
2787
2788 skb->csum = psum;
2789
2790 if (complete || skb->len <= CHECKSUM_BREAK)
2791 return __skb_checksum_complete(skb);
2792
2793 return 0;
2794}
2795
2796static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto)
2797{
2798 return 0;
2799}
2800
2801/* Perform checksum validate (init). Note that this is a macro since we only
2802 * want to calculate the pseudo header which is an input function if necessary.
2803 * First we try to validate without any computation (checksum unnecessary) and
2804 * then calculate based on checksum complete calling the function to compute
2805 * pseudo header.
2806 *
2807 * Return values:
2808 * 0: checksum is validated or try to in skb_checksum_complete
2809 * non-zero: value of invalid checksum
2810 */
2811#define __skb_checksum_validate(skb, proto, complete, \
2812 zero_okay, check, compute_pseudo) \
2813({ \
2814 __sum16 __ret = 0; \
2815 if (__skb_checksum_validate_needed(skb, zero_okay, check)) \
2816 __ret = __skb_checksum_validate_complete(skb, \
2817 complete, compute_pseudo(skb, proto)); \
2818 __ret; \
2819})
2820
2821#define skb_checksum_init(skb, proto, compute_pseudo) \
2822 __skb_checksum_validate(skb, proto, false, false, 0, compute_pseudo)
2823
2824#define skb_checksum_init_zero_check(skb, proto, check, compute_pseudo) \
2825 __skb_checksum_validate(skb, proto, false, true, check, compute_pseudo)
2826
2827#define skb_checksum_validate(skb, proto, compute_pseudo) \
2828 __skb_checksum_validate(skb, proto, true, false, 0, compute_pseudo)
2829
2830#define skb_checksum_validate_zero_check(skb, proto, check, \
2831 compute_pseudo) \
2832 __skb_checksum_validate_(skb, proto, true, true, check, compute_pseudo)
2833
2834#define skb_checksum_simple_validate(skb) \
2835 __skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo)
2836
2744#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
2745void nf_conntrack_destroy(struct nf_conntrack *nfct);
2746static inline void nf_conntrack_put(struct nf_conntrack *nfct)
2747{
2748 if (nfct && atomic_dec_and_test(&nfct->use))
2749 nf_conntrack_destroy(nfct);
2750}
2751static inline void nf_conntrack_get(struct nf_conntrack *nfct)

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2838void nf_conntrack_destroy(struct nf_conntrack *nfct);
2839static inline void nf_conntrack_put(struct nf_conntrack *nfct)
2840{
2841 if (nfct && atomic_dec_and_test(&nfct->use))
2842 nf_conntrack_destroy(nfct);
2843}
2844static inline void nf_conntrack_get(struct nf_conntrack *nfct)

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