90 строки
1.8 KiB
C
90 строки
1.8 KiB
C
/*
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* xfrm_input.c
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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static kmem_cache_t *secpath_cachep;
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void __secpath_destroy(struct sec_path *sp)
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{
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int i;
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for (i = 0; i < sp->len; i++)
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xfrm_state_put(sp->x[i].xvec);
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kmem_cache_free(secpath_cachep, sp);
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}
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EXPORT_SYMBOL(__secpath_destroy);
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struct sec_path *secpath_dup(struct sec_path *src)
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{
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struct sec_path *sp;
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sp = kmem_cache_alloc(secpath_cachep, SLAB_ATOMIC);
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if (!sp)
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return NULL;
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sp->len = 0;
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if (src) {
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int i;
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memcpy(sp, src, sizeof(*sp));
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for (i = 0; i < sp->len; i++)
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xfrm_state_hold(sp->x[i].xvec);
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}
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atomic_set(&sp->refcnt, 1);
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return sp;
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}
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EXPORT_SYMBOL(secpath_dup);
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/* Fetch spi and seq from ipsec header */
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int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq)
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{
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int offset, offset_seq;
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switch (nexthdr) {
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case IPPROTO_AH:
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offset = offsetof(struct ip_auth_hdr, spi);
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offset_seq = offsetof(struct ip_auth_hdr, seq_no);
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break;
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case IPPROTO_ESP:
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offset = offsetof(struct ip_esp_hdr, spi);
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offset_seq = offsetof(struct ip_esp_hdr, seq_no);
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break;
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case IPPROTO_COMP:
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if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
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return -EINVAL;
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*spi = ntohl(ntohs(*(u16*)(skb->h.raw + 2)));
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*seq = 0;
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return 0;
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default:
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return 1;
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}
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if (!pskb_may_pull(skb, 16))
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return -EINVAL;
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*spi = *(u32*)(skb->h.raw + offset);
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*seq = *(u32*)(skb->h.raw + offset_seq);
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return 0;
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}
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EXPORT_SYMBOL(xfrm_parse_spi);
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void __init xfrm_input_init(void)
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{
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secpath_cachep = kmem_cache_create("secpath_cache",
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sizeof(struct sec_path),
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0, SLAB_HWCACHE_ALIGN,
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NULL, NULL);
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if (!secpath_cachep)
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panic("XFRM: failed to allocate secpath_cache\n");
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}
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