+ p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
+ if (p == NULL)
+ goto out;
+ integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
+ integ_len = resbuf->len - integ_offset;
+ BUG_ON(integ_len % 4);
+ *p++ = htonl(integ_len);
+ *p++ = htonl(gc->gc_seq);
+ if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset,
+ integ_len))
+ BUG();
+ if (resbuf->page_len == 0
+ && resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE
+ < PAGE_SIZE) {
+ BUG_ON(resbuf->tail[0].iov_len);
+ /* Use head for everything */
+ resv = &resbuf->head[0];
+ } else if (resbuf->tail[0].iov_base == NULL) {
+ if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+ goto out_err;
+ resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+ + resbuf->head[0].iov_len;
+ resbuf->tail[0].iov_len = 0;
+ resv = &resbuf->tail[0];
+ } else {
+ resv = &resbuf->tail[0];
+ }
+ mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
+ if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
+ goto out_err;
+ svc_putnl(resv, mic.len);
+ memset(mic.data + mic.len, 0,
+ round_up_to_quad(mic.len) - mic.len);
+ resv->iov_len += XDR_QUADLEN(mic.len) << 2;
+ /* not strictly required: */
+ resbuf->len += XDR_QUADLEN(mic.len) << 2;
+ BUG_ON(resv->iov_len > PAGE_SIZE);
+out:
+ stat = 0;
+out_err:
+ return stat;
+}
+
+static inline int
+svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
+{
+ struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
+ struct rpc_gss_wire_cred *gc = &gsd->clcred;
+ struct xdr_buf *resbuf = &rqstp->rq_res;
+ struct page **inpages = NULL;
+ __be32 *p, *len;
+ int offset;
+ int pad;
+
+ p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
+ if (p == NULL)
+ return 0;
+ len = p++;
+ offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
+ *p++ = htonl(gc->gc_seq);
+ inpages = resbuf->pages;
+ /* XXX: Would be better to write some xdr helper functions for
+ * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
+ if (resbuf->tail[0].iov_base) {
+ BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
+ + PAGE_SIZE);
+ BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
+ if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
+ + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+ return -ENOMEM;
+ memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
+ resbuf->tail[0].iov_base,
+ resbuf->tail[0].iov_len);
+ resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
+ }
+ if (resbuf->tail[0].iov_base == NULL) {
+ if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+ return -ENOMEM;
+ resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+ + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
+ resbuf->tail[0].iov_len = 0;
+ }
+ if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
+ return -ENOMEM;
+ *len = htonl(resbuf->len - offset);
+ pad = 3 - ((resbuf->len - offset - 1)&3);
+ p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
+ memset(p, 0, pad);
+ resbuf->tail[0].iov_len += pad;
+ resbuf->len += pad;
+ return 0;
+}
+
+static int
+svcauth_gss_release(struct svc_rqst *rqstp)
+{
+ struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
+ struct rpc_gss_wire_cred *gc = &gsd->clcred;
+ struct xdr_buf *resbuf = &rqstp->rq_res;
+ int stat = -EINVAL;
+