xfrm: Add Traffic Flow Confidentiality padding XFRM attribute
The XFRMA_TFCPAD attribute for XFRM state installation configures Traffic Flow Confidentiality by padding ESP packets to a specified length. Signed-off-by: Martin Willi <martin@strongswan.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -283,6 +283,7 @@ enum xfrm_attr_type_t {
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XFRMA_KMADDRESS, /* struct xfrm_user_kmaddress */
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XFRMA_ALG_AUTH_TRUNC, /* struct xfrm_algo_auth */
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XFRMA_MARK, /* struct xfrm_mark */
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XFRMA_TFCPAD, /* __u32 */
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__XFRMA_MAX
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#define XFRMA_MAX (__XFRMA_MAX - 1)
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@ -143,6 +143,7 @@ struct xfrm_state {
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struct xfrm_id id;
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struct xfrm_selector sel;
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struct xfrm_mark mark;
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u32 tfcpad;
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u32 genid;
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@ -148,7 +148,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
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!attrs[XFRMA_ALG_AUTH_TRUNC]) ||
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attrs[XFRMA_ALG_AEAD] ||
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_ALG_COMP])
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attrs[XFRMA_ALG_COMP] ||
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attrs[XFRMA_TFCPAD])
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goto out;
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break;
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@ -165,6 +166,9 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
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attrs[XFRMA_ALG_CRYPT]) &&
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attrs[XFRMA_ALG_AEAD])
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goto out;
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if (attrs[XFRMA_TFCPAD] &&
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p->mode != XFRM_MODE_TUNNEL)
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goto out;
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break;
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case IPPROTO_COMP:
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@ -172,7 +176,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
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attrs[XFRMA_ALG_AEAD] ||
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attrs[XFRMA_ALG_AUTH] ||
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attrs[XFRMA_ALG_AUTH_TRUNC] ||
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attrs[XFRMA_ALG_CRYPT])
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_TFCPAD])
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goto out;
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break;
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@ -186,6 +191,7 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_ENCAP] ||
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attrs[XFRMA_SEC_CTX] ||
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attrs[XFRMA_TFCPAD] ||
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!attrs[XFRMA_COADDR])
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goto out;
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break;
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@ -439,6 +445,9 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
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goto error;
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}
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if (attrs[XFRMA_TFCPAD])
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x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
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if (attrs[XFRMA_COADDR]) {
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x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
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sizeof(*x->coaddr), GFP_KERNEL);
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@ -688,6 +697,9 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
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if (x->encap)
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NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
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if (x->tfcpad)
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NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);
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if (xfrm_mark_put(skb, &x->mark))
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goto nla_put_failure;
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@ -2122,6 +2134,7 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
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[XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
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[XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
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[XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
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[XFRMA_TFCPAD] = { .type = NLA_U32 },
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};
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static struct xfrm_link {
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@ -2301,6 +2314,8 @@ static inline size_t xfrm_sa_len(struct xfrm_state *x)
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l += nla_total_size(sizeof(*x->calg));
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if (x->encap)
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l += nla_total_size(sizeof(*x->encap));
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if (x->tfcpad)
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l += nla_total_size(sizeof(x->tfcpad));
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if (x->security)
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l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
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x->security->ctx_len);
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