Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * xfrm_input.c |
| 3 | * |
| 4 | * Changes: |
| 5 | * YOSHIFUJI Hideaki @USAGI |
| 6 | * Split up af-specific portion |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <net/ip.h> |
| 13 | #include <net/xfrm.h> |
| 14 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 15 | static kmem_cache_t *secpath_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | void __secpath_destroy(struct sec_path *sp) |
| 18 | { |
| 19 | int i; |
| 20 | for (i = 0; i < sp->len; i++) |
| 21 | xfrm_state_put(sp->x[i].xvec); |
| 22 | kmem_cache_free(secpath_cachep, sp); |
| 23 | } |
| 24 | EXPORT_SYMBOL(__secpath_destroy); |
| 25 | |
| 26 | struct sec_path *secpath_dup(struct sec_path *src) |
| 27 | { |
| 28 | struct sec_path *sp; |
| 29 | |
| 30 | sp = kmem_cache_alloc(secpath_cachep, SLAB_ATOMIC); |
| 31 | if (!sp) |
| 32 | return NULL; |
| 33 | |
| 34 | sp->len = 0; |
| 35 | if (src) { |
| 36 | int i; |
| 37 | |
| 38 | memcpy(sp, src, sizeof(*sp)); |
| 39 | for (i = 0; i < sp->len; i++) |
| 40 | xfrm_state_hold(sp->x[i].xvec); |
| 41 | } |
| 42 | atomic_set(&sp->refcnt, 1); |
| 43 | return sp; |
| 44 | } |
| 45 | EXPORT_SYMBOL(secpath_dup); |
| 46 | |
| 47 | /* Fetch spi and seq from ipsec header */ |
| 48 | |
| 49 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq) |
| 50 | { |
| 51 | int offset, offset_seq; |
| 52 | |
| 53 | switch (nexthdr) { |
| 54 | case IPPROTO_AH: |
| 55 | offset = offsetof(struct ip_auth_hdr, spi); |
| 56 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); |
| 57 | break; |
| 58 | case IPPROTO_ESP: |
| 59 | offset = offsetof(struct ip_esp_hdr, spi); |
| 60 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); |
| 61 | break; |
| 62 | case IPPROTO_COMP: |
| 63 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) |
| 64 | return -EINVAL; |
| 65 | *spi = ntohl(ntohs(*(u16*)(skb->h.raw + 2))); |
| 66 | *seq = 0; |
| 67 | return 0; |
| 68 | default: |
| 69 | return 1; |
| 70 | } |
| 71 | |
| 72 | if (!pskb_may_pull(skb, 16)) |
| 73 | return -EINVAL; |
| 74 | |
| 75 | *spi = *(u32*)(skb->h.raw + offset); |
| 76 | *seq = *(u32*)(skb->h.raw + offset_seq); |
| 77 | return 0; |
| 78 | } |
| 79 | EXPORT_SYMBOL(xfrm_parse_spi); |
| 80 | |
| 81 | void __init xfrm_input_init(void) |
| 82 | { |
| 83 | secpath_cachep = kmem_cache_create("secpath_cache", |
| 84 | sizeof(struct sec_path), |
| 85 | 0, SLAB_HWCACHE_ALIGN, |
| 86 | NULL, NULL); |
| 87 | if (!secpath_cachep) |
| 88 | panic("XFRM: failed to allocate secpath_cache\n"); |
| 89 | } |