ah4.c revision fa9921e46fd52b78070dc67ce0d27ec301a90410
1dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert#include <crypto/hash.h> 207d4ee583e21830ec5604d31f65cdc60a6eca19eHerbert Xu#include <linux/err.h> 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 45a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <net/ip.h> 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <net/xfrm.h> 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <net/ah.h> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/crypto.h> 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pfkeyv2.h> 10dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert#include <linux/scatterlist.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <net/icmp.h> 1214c850212ed8f8cbb5972ad6b8812e08a0bc901cArnaldo Carvalho de Melo#include <net/protocol.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstruct ah_skb_cb { 15dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct xfrm_skb_cb xfrm; 16dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert void *tmp; 17dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert}; 18dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 19dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0])) 20dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 21dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags, 22dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert unsigned int size) 23dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 24dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert unsigned int len; 25dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 26dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert len = size + crypto_ahash_digestsize(ahash) + 27dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert (crypto_ahash_alignmask(ahash) & 28dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ~(crypto_tfm_ctx_alignment() - 1)); 29dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 30dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert len = ALIGN(len, crypto_tfm_ctx_alignment()); 31dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 32dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash); 33dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert len = ALIGN(len, __alignof__(struct scatterlist)); 34dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 35dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert len += sizeof(struct scatterlist) * nfrags; 36dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 37dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert return kmalloc(len, GFP_ATOMIC); 38dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 39dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 40dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic inline u8 *ah_tmp_auth(void *tmp, unsigned int offset) 41dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 42dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert return tmp + offset; 43dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 44dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 45dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp, 46dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert unsigned int offset) 47dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 48dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1); 49dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 50dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 51dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash, 52dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *icv) 53dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 54dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ahash_request *req; 55dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 56dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash), 57dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert crypto_tfm_ctx_alignment()); 58dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 59dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash_request_set_tfm(req, ahash); 60dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 61dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert return req; 62dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 63dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 64dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash, 65dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ahash_request *req) 66dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 67dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert return (void *)ALIGN((unsigned long)(req + 1) + 68dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert crypto_ahash_reqsize(ahash), 69dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert __alignof__(struct scatterlist)); 70dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Clear mutable options and find final destination to substitute 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * into IP header for icv calculation. Options are already checked 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for validity, so paranoia is not required. */ 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 76d5a0a1e3109339090769e40fdaa62482fcf2a717Al Virostatic int ip_clear_mutable_options(struct iphdr *iph, __be32 *daddr) 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char * optptr = (unsigned char*)(iph+1); 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int l = iph->ihl*4 - sizeof(struct iphdr); 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int optlen; 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (l > 0) { 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (*optptr) { 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_END: 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_NOOP: 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds l--; 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds optptr++; 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds optlen = optptr[1]; 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (optlen<2 || optlen>l) 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (*optptr) { 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_SEC: 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 0x85: /* Some "Extended Security" crap. */ 9711a03f78fbf15a866ba3bf6359a75cdfd1ced703Paul Moore case IPOPT_CIPSO: 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_RA: 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 0x80|21: /* RFC1770 */ 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_LSRR: 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IPOPT_SSRR: 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (optlen < 6) 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(daddr, optptr+optlen-4, 4); 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Fall through */ 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 10896fe1c0237224b24a0dfaaee6467a5767902ba4aNick Bowler memset(optptr, 0, optlen); 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds l -= optlen; 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds optptr += optlen; 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 116dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic void ah_output_done(struct crypto_async_request *base, int err) 117dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 118dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *icv; 119dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct iphdr *iph; 120dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct sk_buff *skb = base->data; 121dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct xfrm_state *x = skb_dst(skb)->xfrm; 122dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ah_data *ahp = x->data; 123dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct iphdr *top_iph = ip_hdr(skb); 124dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ip_auth_hdr *ah = ip_auth_hdr(skb); 125dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int ihl = ip_hdrlen(skb); 126dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 127dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert iph = AH_SKB_CB(skb)->tmp; 128dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert icv = ah_tmp_icv(ahp->ahash, iph, ihl); 129dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(ah->auth_data, icv, ahp->icv_trunc_len); 130dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 131dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert top_iph->tos = iph->tos; 132dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert top_iph->ttl = iph->ttl; 133dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert top_iph->frag_off = iph->frag_off; 134dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (top_iph->ihl != 5) { 135dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert top_iph->daddr = iph->daddr; 136dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); 137dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert } 138dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 139dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = ah->nexthdr; 140dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 141dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert kfree(AH_SKB_CB(skb)->tmp); 142dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert xfrm_output_resume(skb, err); 143dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 144dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int ah_output(struct xfrm_state *x, struct sk_buff *skb) 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err; 148dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int nfrags; 149dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int ihl; 150dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *icv; 151dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct sk_buff *trailer; 152dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct crypto_ahash *ahash; 153dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ahash_request *req; 154dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct scatterlist *sg; 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct iphdr *iph, *top_iph; 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ip_auth_hdr *ah; 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ah_data *ahp; 158dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 159dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahp = x->data; 160dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash = ahp->ahash; 161dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 162dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if ((err = skb_cow_data(skb, 0, &trailer)) < 0) 163dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 164dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert nfrags = err; 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1667b277b1a5fb147cb828e5d8b9780cee60f31a9bfHerbert Xu skb_push(skb, -skb_network_offset(skb)); 167dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ah = ip_auth_hdr(skb); 168dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ihl = ip_hdrlen(skb); 169dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 170dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = -ENOMEM; 171dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert iph = ah_alloc_tmp(ahash, nfrags, ihl); 172dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (!iph) 173dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 174dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 175dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert icv = ah_tmp_icv(ahash, iph, ihl); 176dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert req = ah_tmp_req(ahash, icv); 177dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert sg = ah_req_sg(ahash, req); 178dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 179dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memset(ah->auth_data, 0, ahp->icv_trunc_len); 180dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 181eddc9ec53be2ecdbf4efe0efd4a83052594f0ac0Arnaldo Carvalho de Melo top_iph = ip_hdr(skb); 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->tos = top_iph->tos; 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->ttl = top_iph->ttl; 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->frag_off = top_iph->frag_off; 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (top_iph->ihl != 5) { 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->daddr = top_iph->daddr; 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = ip_clear_mutable_options(top_iph, &top_iph->daddr); 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) 192dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out_free; 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 19537fedd3aab6517daec628764c5d66dd8761fbe5fHerbert Xu ah->nexthdr = *skb_mac_header(skb); 19637fedd3aab6517daec628764c5d66dd8761fbe5fHerbert Xu *skb_mac_header(skb) = IPPROTO_AH; 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->tos = 0; 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->tot_len = htons(skb->len); 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->frag_off = 0; 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->ttl = 0; 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->check = 0; 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 204fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel if (x->props.flags & XFRM_STATE_ALIGN4) 205fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ah->hdrlen = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; 206fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel else 207fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ah->reserved = 0; 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ah->spi = x->id.spi; 211b318e0e4ef4e85812c25afa19f75addccc834cd4Herbert Xu ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output); 212b7c6538cd84f8072fad43bfce530f5bf695edbbaHerbert Xu 213dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert sg_init_table(sg, nfrags); 214dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb_to_sgvec(skb, sg, 0, skb->len); 215b7c6538cd84f8072fad43bfce530f5bf695edbbaHerbert Xu 216dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash_request_set_crypt(req, sg, icv, skb->len); 217dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash_request_set_callback(req, 0, ah_output_done, skb); 218dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 219dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert AH_SKB_CB(skb)->tmp = iph; 220dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 221dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = crypto_ahash_digest(req); 222dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err) { 223dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err == -EINPROGRESS) 224dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 225dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 226dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err == -EBUSY) 227dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = NET_XMIT_DROP; 228dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out_free; 229dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert } 230dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 231dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(ah->auth_data, icv, ahp->icv_trunc_len); 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->tos = iph->tos; 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->ttl = iph->ttl; 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->frag_off = iph->frag_off; 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (top_iph->ihl != 5) { 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds top_iph->daddr = iph->daddr; 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 241dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertout_free: 242dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert kfree(iph); 243dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertout: 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 247dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertstatic void ah_input_done(struct crypto_async_request *base, int err) 248dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert{ 249dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *auth_data; 250dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *icv; 251dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct iphdr *work_iph; 252dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct sk_buff *skb = base->data; 253dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct xfrm_state *x = xfrm_input_state(skb); 254dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ah_data *ahp = x->data; 255dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ip_auth_hdr *ah = ip_auth_hdr(skb); 256dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int ihl = ip_hdrlen(skb); 257dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int ah_hlen = (ah->hdrlen + 2) << 2; 258dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 259dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert work_iph = AH_SKB_CB(skb)->tmp; 260dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert auth_data = ah_tmp_auth(work_iph, ihl); 261dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len); 262dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 263dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0; 264dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err) 265dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 266dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 267dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb->network_header += ah_hlen; 268dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(skb_network_header(skb), work_iph, ihl); 269dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert __skb_pull(skb, ah_hlen + ihl); 270dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb_set_transport_header(skb, -ihl); 271dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 272dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = ah->nexthdr; 273dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertout: 274dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert kfree(AH_SKB_CB(skb)->tmp); 275dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert xfrm_input_resume(skb, err); 276dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert} 277dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 278e695633e21ffb6a443a8c2f8b3f095c7f1a48eb0Herbert Xustatic int ah_input(struct xfrm_state *x, struct sk_buff *skb) 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ah_hlen; 28131a4ab93025719e62e7cf7ce899f71c34ecde5a0Herbert Xu int ihl; 282631a6698d09e57cadc069914d613899609a0ae83Herbert Xu int nexthdr; 283dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int nfrags; 284dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *auth_data; 285dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert u8 *icv; 286dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct sk_buff *trailer; 287dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct crypto_ahash *ahash; 288dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct ahash_request *req; 289dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct scatterlist *sg; 290dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct iphdr *iph, *work_iph; 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ip_auth_hdr *ah; 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ah_data *ahp; 293dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert int err = -ENOMEM; 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 29587bdc48d304191313203df9b98d783e1ab5a55abHerbert Xu if (!pskb_may_pull(skb, sizeof(*ah))) 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 29887bdc48d304191313203df9b98d783e1ab5a55abHerbert Xu ah = (struct ip_auth_hdr *)skb->data; 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ahp = x->data; 300dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash = ahp->ahash; 301dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 302631a6698d09e57cadc069914d613899609a0ae83Herbert Xu nexthdr = ah->nexthdr; 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ah_hlen = (ah->hdrlen + 2) << 2; 304e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 305fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel if (x->props.flags & XFRM_STATE_ALIGN4) { 306fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) && 307fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len)) 308fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel goto out; 309fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel } else { 310fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && 311fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) 312fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel goto out; 313fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel } 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!pskb_may_pull(skb, ah_hlen)) 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* We are going to _remove_ AH header to keep sockets happy, 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * so... Later this can change. */ 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (skb_cloned(skb) && 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 326dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 327dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if ((err = skb_cow_data(skb, 0, &trailer)) < 0) 328dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 329dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert nfrags = err; 330dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 3314b0ef1f223be4e092632b4152ceec5627ac10f59Dang Hongwu ah = (struct ip_auth_hdr *)skb->data; 3324b0ef1f223be4e092632b4152ceec5627ac10f59Dang Hongwu iph = ip_hdr(skb); 3334b0ef1f223be4e092632b4152ceec5627ac10f59Dang Hongwu ihl = ip_hdrlen(skb); 3344b0ef1f223be4e092632b4152ceec5627ac10f59Dang Hongwu 335dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert work_iph = ah_alloc_tmp(ahash, nfrags, ihl + ahp->icv_trunc_len); 336dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (!work_iph) 337dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 338dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 339dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert auth_data = ah_tmp_auth(work_iph, ihl); 340dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len); 341dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert req = ah_tmp_req(ahash, icv); 342dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert sg = ah_req_sg(ahash, req); 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 344dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(work_iph, iph, ihl); 345dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); 346dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memset(ah->auth_data, 0, ahp->icv_trunc_len); 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->ttl = 0; 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->tos = 0; 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->frag_off = 0; 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iph->check = 0; 35231a4ab93025719e62e7cf7ce899f71c34ecde5a0Herbert Xu if (ihl > sizeof(*iph)) { 353d5a0a1e3109339090769e40fdaa62482fcf2a717Al Viro __be32 dummy; 354dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = ip_clear_mutable_options(iph, &dummy); 355dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err) 356dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out_free; 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3580ebea8ef3559b545c37b016f44e84c3b33e47c39Herbert Xu 359dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb_push(skb, ihl); 360e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 361dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert sg_init_table(sg, nfrags); 362dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb_to_sgvec(skb, sg, 0, skb->len); 363dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 364dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash_request_set_crypt(req, sg, icv, skb->len); 365dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash_request_set_callback(req, 0, ah_input_done, skb); 366dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 367dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert AH_SKB_CB(skb)->tmp = work_iph; 368dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 369dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = crypto_ahash_digest(req); 370dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err) { 371dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err == -EINPROGRESS) 372dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out; 373dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert 374dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (err == -EBUSY) 375dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = NET_XMIT_DROP; 376dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out_free; 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3780ebea8ef3559b545c37b016f44e84c3b33e47c39Herbert Xu 379dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0; 3800ebea8ef3559b545c37b016f44e84c3b33e47c39Herbert Xu if (err) 381dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert goto out_free; 3820ebea8ef3559b545c37b016f44e84c3b33e47c39Herbert Xu 383b0e380b1d8a8e0aca215df97702f99815f05c094Arnaldo Carvalho de Melo skb->network_header += ah_hlen; 384dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert memcpy(skb_network_header(skb), work_iph, ihl); 38531a4ab93025719e62e7cf7ce899f71c34ecde5a0Herbert Xu __skb_pull(skb, ah_hlen + ihl); 386dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert skb_set_transport_header(skb, -ihl); 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 388dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert err = nexthdr; 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 390dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassertout_free: 391dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert kfree (work_iph); 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsout: 39307d4ee583e21830ec5604d31f65cdc60a6eca19eHerbert Xu return err; 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void ah4_err(struct sk_buff *skb, u32 info) 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3984fb236bac9fc7d51e2267866de6d4c30e549d2f8Alexey Dobriyan struct net *net = dev_net(skb->dev); 399d9319100c1ad7d0ed4045ded767684ad25670436Jianjun Kong struct iphdr *iph = (struct iphdr *)skb->data; 400d9319100c1ad7d0ed4045ded767684ad25670436Jianjun Kong struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xfrm_state *x; 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 40388c7664f13bd1a36acb8566b93892a4c58759ac6Arnaldo Carvalho de Melo if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH || 40488c7664f13bd1a36acb8566b93892a4c58759ac6Arnaldo Carvalho de Melo icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 407bd55775c8dd656fc69b3a42a1c4ab32abb7e8af9Jamal Hadi Salim x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET); 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!x) 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_DEBUG "pmtu discovery on SA AH/%08x/%08x\n", 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ntohl(ah->spi), ntohl(iph->daddr)); 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xfrm_state_put(x); 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 41572cb6962a91f2af9eef69a06198e1949c10259aeHerbert Xustatic int ah_init_state(struct xfrm_state *x) 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ah_data *ahp = NULL; 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xfrm_algo_desc *aalg_desc; 419dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert struct crypto_ahash *ahash; 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!x->aalg) 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto error; 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (x->encap) 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto error; 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4270da974f4f303a6842516b764507e3c0a03f41e5aPanagiotis Issaris ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); 428dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (!ahp) 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 431dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0); 432dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (IS_ERR(ahash)) 43307d4ee583e21830ec5604d31f65cdc60a6eca19eHerbert Xu goto error; 43407d4ee583e21830ec5604d31f65cdc60a6eca19eHerbert Xu 435dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert ahp->ahash = ahash; 436dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert if (crypto_ahash_setkey(ahash, x->aalg->alg_key, 437dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert (x->aalg->alg_key_len + 7) / 8)) 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto error; 439e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Lookup the algorithm description maintained by xfrm_algo, 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * verify crypto transform properties, and store information 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * we need for AH processing. This lookup cannot fail here 444dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert * after a successful crypto_alloc_ahash(). 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(!aalg_desc); 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (aalg_desc->uinfo.auth.icv_fullbits/8 != 450dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert crypto_ahash_digestsize(ahash)) { 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "AH: %s digestsize %u != %hu\n", 452dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert x->aalg->alg_name, crypto_ahash_digestsize(ahash), 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds aalg_desc->uinfo.auth.icv_fullbits/8); 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto error; 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 456e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; 4588f8a088c2127c729638da8f2d33860e346c01edaMartin Willi ahp->icv_trunc_len = x->aalg->alg_trunc_len/8; 459e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 4601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN); 461e905a9edab7f4f14f9213b52234e4a346c690911YOSHIFUJI Hideaki 462fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel if (x->props.flags & XFRM_STATE_ALIGN4) 463fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) + 464fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ahp->icv_trunc_len); 465fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel else 466fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + 467fa9921e46fd52b78070dc67ce0d27ec301a90410Nicolas Dichtel ahp->icv_trunc_len); 4687e49e6de30efa716614e280d97963c570f3acf29Masahide NAKAMURA if (x->props.mode == XFRM_MODE_TUNNEL) 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds x->props.header_len += sizeof(struct iphdr); 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds x->data = ahp; 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldserror: 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ahp) { 476dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert crypto_free_ahash(ahp->ahash); 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ahp); 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void ah_destroy(struct xfrm_state *x) 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct ah_data *ahp = x->data; 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ahp) 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 489dff3bb0626279bae04ed10ed61ab726d6b3ef4b4Steffen Klassert crypto_free_ahash(ahp->ahash); 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ahp); 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 494533cb5b0a63f28ecab5503cfceb77e641fa7f7c4Eric Dumazetstatic const struct xfrm_type ah_type = 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .description = "AH4", 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .proto = IPPROTO_AH, 499436a0a402203d5a47d2edf7e4dde6c08a7257983Herbert Xu .flags = XFRM_TYPE_REPLAY_PROT, 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .init_state = ah_init_state, 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .destructor = ah_destroy, 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .input = ah_input, 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .output = ah_output 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 50632613090a96dba2ca2cc524c8d4749d3126fdde5Alexey Dobriyanstatic const struct net_protocol ah4_protocol = { 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .handler = xfrm4_rcv, 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .err_handler = ah4_err, 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .no_policy = 1, 5104fb236bac9fc7d51e2267866de6d4c30e549d2f8Alexey Dobriyan .netns_ok = 1, 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init ah4_init(void) 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (xfrm_register_type(&ah_type, AF_INET) < 0) { 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "ip ah init: can't add xfrm type\n"); 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EAGAIN; 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (inet_add_protocol(&ah4_protocol, IPPROTO_AH) < 0) { 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "ip ah init: can't add protocol\n"); 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xfrm_unregister_type(&ah_type, AF_INET); 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EAGAIN; 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit ah4_fini(void) 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (inet_del_protocol(&ah4_protocol, IPPROTO_AH) < 0) 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "ip ah close: can't remove protocol\n"); 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (xfrm_unregister_type(&ah_type, AF_INET) < 0) 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "ip ah close: can't remove xfrm type\n"); 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(ah4_init); 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(ah4_fini); 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 538d3d6dd3adaaad71eae20902ed81808a66a40a5b9Masahide NAKAMURAMODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH); 539