^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #define pr_fmt(fmt) "IPsec: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <crypto/algapi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <crypto/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <net/ah.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/crypto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/pfkeyv2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct ah_skb_cb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct xfrm_skb_cb xfrm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) void *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) len = size + crypto_ahash_digestsize(ahash) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) (crypto_ahash_alignmask(ahash) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) ~(crypto_tfm_ctx_alignment() - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) len = ALIGN(len, crypto_tfm_ctx_alignment());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) len = ALIGN(len, __alignof__(struct scatterlist));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) len += sizeof(struct scatterlist) * nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return kmalloc(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return tmp + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u8 *icv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct ahash_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) crypto_tfm_ctx_alignment());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ahash_request_set_tfm(req, ahash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct ahash_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return (void *)ALIGN((unsigned long)(req + 1) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) crypto_ahash_reqsize(ahash),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) __alignof__(struct scatterlist));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* Clear mutable options and find final destination to substitute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * into IP header for icv calculation. Options are already checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * for validity, so paranoia is not required. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned char *optptr = (unsigned char *)(iph+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int l = iph->ihl*4 - sizeof(struct iphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int optlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) while (l > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) switch (*optptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case IPOPT_END:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case IPOPT_NOOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) l--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) optptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) optlen = optptr[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (optlen<2 || optlen>l)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) switch (*optptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) case IPOPT_SEC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case 0x85: /* Some "Extended Security" crap. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) case IPOPT_CIPSO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case IPOPT_RA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) case 0x80|21: /* RFC1770 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) case IPOPT_LSRR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) case IPOPT_SSRR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (optlen < 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) memcpy(daddr, optptr+optlen-4, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) memset(optptr, 0, optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) l -= optlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) optptr += optlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static void ah_output_done(struct crypto_async_request *base, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) u8 *icv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct sk_buff *skb = base->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct xfrm_state *x = skb_dst(skb)->xfrm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct ah_data *ahp = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct iphdr *top_iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct ip_auth_hdr *ah = ip_auth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) int ihl = ip_hdrlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) iph = AH_SKB_CB(skb)->tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) icv = ah_tmp_icv(ahp->ahash, iph, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) top_iph->tos = iph->tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) top_iph->ttl = iph->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) top_iph->frag_off = iph->frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (top_iph->ihl != 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) top_iph->daddr = iph->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) kfree(AH_SKB_CB(skb)->tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) xfrm_output_resume(skb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) int ihl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) u8 *icv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct sk_buff *trailer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct crypto_ahash *ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct ahash_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct scatterlist *sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct iphdr *iph, *top_iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct ip_auth_hdr *ah;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct ah_data *ahp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) int seqhi_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) __be32 *seqhi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int sglists = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct scatterlist *seqhisg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ahp = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) ahash = ahp->ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) nfrags = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ah = ip_auth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ihl = ip_hdrlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (x->props.flags & XFRM_STATE_ESN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) sglists = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) seqhi_len = sizeof(*seqhi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!iph)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) seqhi = (__be32 *)((char *)iph + ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) req = ah_tmp_req(ahash, icv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) sg = ah_req_sg(ahash, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) seqhisg = sg + nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) memset(ah->auth_data, 0, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) top_iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) iph->tos = top_iph->tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) iph->ttl = top_iph->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) iph->frag_off = top_iph->frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (top_iph->ihl != 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) iph->daddr = top_iph->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) err = ip_clear_mutable_options(top_iph, &top_iph->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ah->nexthdr = *skb_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) *skb_mac_header(skb) = IPPROTO_AH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) top_iph->tos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) top_iph->tot_len = htons(skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) top_iph->frag_off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) top_iph->ttl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) top_iph->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (x->props.flags & XFRM_STATE_ALIGN4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ah->hdrlen = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ah->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) ah->spi = x->id.spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) sg_init_table(sg, nfrags + sglists);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (unlikely(err < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (x->props.flags & XFRM_STATE_ESN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* Attach seqhi sg right after packet payload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) sg_set_buf(seqhisg, seqhi, seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ahash_request_set_callback(req, 0, ah_output_done, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) AH_SKB_CB(skb)->tmp = iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) err = crypto_ahash_digest(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (err == -EINPROGRESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (err == -ENOSPC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) err = NET_XMIT_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) top_iph->tos = iph->tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) top_iph->ttl = iph->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) top_iph->frag_off = iph->frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (top_iph->ihl != 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) top_iph->daddr = iph->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) kfree(iph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static void ah_input_done(struct crypto_async_request *base, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) u8 *auth_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) u8 *icv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct iphdr *work_iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct sk_buff *skb = base->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct xfrm_state *x = xfrm_input_state(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) struct ah_data *ahp = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) struct ip_auth_hdr *ah = ip_auth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int ihl = ip_hdrlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) int ah_hlen = (ah->hdrlen + 2) << 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) work_iph = AH_SKB_CB(skb)->tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) auth_data = ah_tmp_auth(work_iph, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) err = ah->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) skb->network_header += ah_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) memcpy(skb_network_header(skb), work_iph, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) __skb_pull(skb, ah_hlen + ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (x->props.mode == XFRM_MODE_TUNNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) skb_set_transport_header(skb, -ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) kfree(AH_SKB_CB(skb)->tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) xfrm_input_resume(skb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) int ah_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) int ihl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) int nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) int nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) u8 *auth_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) u8 *icv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct sk_buff *trailer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct crypto_ahash *ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct ahash_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct scatterlist *sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct iphdr *iph, *work_iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) struct ip_auth_hdr *ah;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) struct ah_data *ahp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) int seqhi_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) __be32 *seqhi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) int sglists = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct scatterlist *seqhisg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (!pskb_may_pull(skb, sizeof(*ah)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ah = (struct ip_auth_hdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) ahp = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ahash = ahp->ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) nexthdr = ah->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) ah_hlen = (ah->hdrlen + 2) << 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (x->props.flags & XFRM_STATE_ALIGN4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (!pskb_may_pull(skb, ah_hlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* We are going to _remove_ AH header to keep sockets happy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * so... Later this can change. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (skb_unclone(skb, GFP_ATOMIC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) nfrags = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) ah = (struct ip_auth_hdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) ihl = ip_hdrlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (x->props.flags & XFRM_STATE_ESN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) sglists = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) seqhi_len = sizeof(*seqhi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) ahp->icv_trunc_len + seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!work_iph) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) seqhi = (__be32 *)((char *)work_iph + ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) auth_data = ah_tmp_auth(seqhi, seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) req = ah_tmp_req(ahash, icv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) sg = ah_req_sg(ahash, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) seqhisg = sg + nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) memcpy(work_iph, iph, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) memset(ah->auth_data, 0, ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) iph->ttl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) iph->tos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) iph->frag_off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) iph->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (ihl > sizeof(*iph)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) __be32 dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) err = ip_clear_mutable_options(iph, &dummy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) skb_push(skb, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) sg_init_table(sg, nfrags + sglists);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (unlikely(err < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (x->props.flags & XFRM_STATE_ESN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /* Attach seqhi sg right after packet payload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) *seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) sg_set_buf(seqhisg, seqhi, seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) ahash_request_set_callback(req, 0, ah_input_done, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) AH_SKB_CB(skb)->tmp = work_iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) err = crypto_ahash_digest(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (err == -EINPROGRESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) skb->network_header += ah_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) memcpy(skb_network_header(skb), work_iph, ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) __skb_pull(skb, ah_hlen + ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (x->props.mode == XFRM_MODE_TUNNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) skb_set_transport_header(skb, -ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) err = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) kfree (work_iph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static int ah4_err(struct sk_buff *skb, u32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) struct net *net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) const struct iphdr *iph = (const struct iphdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct xfrm_state *x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) switch (icmp_hdr(skb)->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) case ICMP_DEST_UNREACH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) case ICMP_REDIRECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) ah->spi, IPPROTO_AH, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) ipv4_redirect(skb, net, 0, IPPROTO_AH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) xfrm_state_put(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) static int ah_init_state(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) struct ah_data *ahp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) struct xfrm_algo_desc *aalg_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) struct crypto_ahash *ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (!x->aalg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (x->encap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (!ahp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (IS_ERR(ahash))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) ahp->ahash = ahash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) (x->aalg->alg_key_len + 7) / 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * Lookup the algorithm description maintained by xfrm_algo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * verify crypto transform properties, and store information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * we need for AH processing. This lookup cannot fail here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * after a successful crypto_alloc_ahash().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) BUG_ON(!aalg_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) crypto_ahash_digestsize(ahash)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) pr_info("%s: %s digestsize %u != %hu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) __func__, x->aalg->alg_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) crypto_ahash_digestsize(ahash),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) aalg_desc->uinfo.auth.icv_fullbits / 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (x->props.flags & XFRM_STATE_ALIGN4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) ahp->icv_trunc_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (x->props.mode == XFRM_MODE_TUNNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) x->props.header_len += sizeof(struct iphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) x->data = ahp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (ahp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) crypto_free_ahash(ahp->ahash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) kfree(ahp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) static void ah_destroy(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) struct ah_data *ahp = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (!ahp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) crypto_free_ahash(ahp->ahash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) kfree(ahp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) static int ah4_rcv_cb(struct sk_buff *skb, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) static const struct xfrm_type ah_type =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) .description = "AH4",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) .proto = IPPROTO_AH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) .flags = XFRM_TYPE_REPLAY_PROT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) .init_state = ah_init_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) .destructor = ah_destroy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) .input = ah_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) .output = ah_output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) static struct xfrm4_protocol ah4_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) .handler = xfrm4_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) .input_handler = xfrm_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) .cb_handler = ah4_rcv_cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) .err_handler = ah4_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) .priority = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) static int __init ah4_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) if (xfrm_register_type(&ah_type, AF_INET) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) pr_info("%s: can't add xfrm type\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) pr_info("%s: can't add protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) xfrm_unregister_type(&ah_type, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) static void __exit ah4_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) pr_info("%s: can't remove protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) xfrm_unregister_type(&ah_type, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) module_init(ah4_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) module_exit(ah4_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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