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581 lines
13 KiB
581 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <net/tcp.h> |
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#include <net/strparser.h> |
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#include <net/xfrm.h> |
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#include <net/esp.h> |
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#include <net/espintcp.h> |
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#include <linux/skmsg.h> |
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#include <net/inet_common.h> |
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#if IS_ENABLED(CONFIG_IPV6) |
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#include <net/ipv6_stubs.h> |
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#endif |
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|
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static void handle_nonesp(struct espintcp_ctx *ctx, struct sk_buff *skb, |
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struct sock *sk) |
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{ |
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if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf || |
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!sk_rmem_schedule(sk, skb, skb->truesize)) { |
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XFRM_INC_STATS(sock_net(sk), LINUX_MIB_XFRMINERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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skb_set_owner_r(skb, sk); |
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|
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memset(skb->cb, 0, sizeof(skb->cb)); |
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skb_queue_tail(&ctx->ike_queue, skb); |
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ctx->saved_data_ready(sk); |
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} |
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|
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static void handle_esp(struct sk_buff *skb, struct sock *sk) |
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{ |
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struct tcp_skb_cb *tcp_cb = (struct tcp_skb_cb *)skb->cb; |
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|
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skb_reset_transport_header(skb); |
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|
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/* restore IP CB, we need at least IP6CB->nhoff */ |
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memmove(skb->cb, &tcp_cb->header, sizeof(tcp_cb->header)); |
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|
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rcu_read_lock(); |
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skb->dev = dev_get_by_index_rcu(sock_net(sk), skb->skb_iif); |
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local_bh_disable(); |
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#if IS_ENABLED(CONFIG_IPV6) |
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if (sk->sk_family == AF_INET6) |
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ipv6_stub->xfrm6_rcv_encap(skb, IPPROTO_ESP, 0, TCP_ENCAP_ESPINTCP); |
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else |
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#endif |
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xfrm4_rcv_encap(skb, IPPROTO_ESP, 0, TCP_ENCAP_ESPINTCP); |
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local_bh_enable(); |
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rcu_read_unlock(); |
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} |
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|
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static void espintcp_rcv(struct strparser *strp, struct sk_buff *skb) |
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{ |
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struct espintcp_ctx *ctx = container_of(strp, struct espintcp_ctx, |
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strp); |
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struct strp_msg *rxm = strp_msg(skb); |
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int len = rxm->full_len - 2; |
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u32 nonesp_marker; |
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int err; |
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|
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/* keepalive packet? */ |
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if (unlikely(len == 1)) { |
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u8 data; |
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|
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err = skb_copy_bits(skb, rxm->offset + 2, &data, 1); |
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if (err < 0) { |
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XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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if (data == 0xff) { |
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kfree_skb(skb); |
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return; |
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} |
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} |
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|
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/* drop other short messages */ |
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if (unlikely(len <= sizeof(nonesp_marker))) { |
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XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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err = skb_copy_bits(skb, rxm->offset + 2, &nonesp_marker, |
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sizeof(nonesp_marker)); |
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if (err < 0) { |
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XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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/* remove header, leave non-ESP marker/SPI */ |
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if (!__pskb_pull(skb, rxm->offset + 2)) { |
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XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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if (pskb_trim(skb, rxm->full_len - 2) != 0) { |
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XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINERROR); |
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kfree_skb(skb); |
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return; |
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} |
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|
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if (nonesp_marker == 0) |
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handle_nonesp(ctx, skb, strp->sk); |
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else |
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handle_esp(skb, strp->sk); |
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} |
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|
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static int espintcp_parse(struct strparser *strp, struct sk_buff *skb) |
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{ |
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struct strp_msg *rxm = strp_msg(skb); |
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__be16 blen; |
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u16 len; |
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int err; |
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|
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if (skb->len < rxm->offset + 2) |
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return 0; |
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|
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err = skb_copy_bits(skb, rxm->offset, &blen, sizeof(blen)); |
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if (err < 0) |
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return err; |
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|
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len = be16_to_cpu(blen); |
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if (len < 2) |
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return -EINVAL; |
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|
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return len; |
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} |
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|
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static int espintcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
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int nonblock, int flags, int *addr_len) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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struct sk_buff *skb; |
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int err = 0; |
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int copied; |
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int off = 0; |
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|
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flags |= nonblock ? MSG_DONTWAIT : 0; |
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|
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skb = __skb_recv_datagram(sk, &ctx->ike_queue, flags, &off, &err); |
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if (!skb) { |
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if (err == -EAGAIN && sk->sk_shutdown & RCV_SHUTDOWN) |
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return 0; |
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return err; |
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} |
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|
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copied = len; |
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if (copied > skb->len) |
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copied = skb->len; |
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else if (copied < skb->len) |
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msg->msg_flags |= MSG_TRUNC; |
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|
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err = skb_copy_datagram_msg(skb, 0, msg, copied); |
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if (unlikely(err)) { |
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kfree_skb(skb); |
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return err; |
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} |
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|
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if (flags & MSG_TRUNC) |
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copied = skb->len; |
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kfree_skb(skb); |
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return copied; |
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} |
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|
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int espintcp_queue_out(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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|
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if (skb_queue_len(&ctx->out_queue) >= netdev_max_backlog) |
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return -ENOBUFS; |
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|
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__skb_queue_tail(&ctx->out_queue, skb); |
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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(espintcp_queue_out); |
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|
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/* espintcp length field is 2B and length includes the length field's size */ |
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#define MAX_ESPINTCP_MSG (((1 << 16) - 1) - 2) |
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|
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static int espintcp_sendskb_locked(struct sock *sk, struct espintcp_msg *emsg, |
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int flags) |
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{ |
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do { |
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int ret; |
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|
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ret = skb_send_sock_locked(sk, emsg->skb, |
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emsg->offset, emsg->len); |
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if (ret < 0) |
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return ret; |
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|
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emsg->len -= ret; |
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emsg->offset += ret; |
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} while (emsg->len > 0); |
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|
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kfree_skb(emsg->skb); |
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memset(emsg, 0, sizeof(*emsg)); |
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|
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return 0; |
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} |
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|
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static int espintcp_sendskmsg_locked(struct sock *sk, |
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struct espintcp_msg *emsg, int flags) |
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{ |
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struct sk_msg *skmsg = &emsg->skmsg; |
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struct scatterlist *sg; |
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int done = 0; |
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int ret; |
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|
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flags |= MSG_SENDPAGE_NOTLAST; |
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sg = &skmsg->sg.data[skmsg->sg.start]; |
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do { |
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size_t size = sg->length - emsg->offset; |
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int offset = sg->offset + emsg->offset; |
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struct page *p; |
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|
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emsg->offset = 0; |
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|
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if (sg_is_last(sg)) |
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flags &= ~MSG_SENDPAGE_NOTLAST; |
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|
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p = sg_page(sg); |
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retry: |
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ret = do_tcp_sendpages(sk, p, offset, size, flags); |
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if (ret < 0) { |
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emsg->offset = offset - sg->offset; |
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skmsg->sg.start += done; |
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return ret; |
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} |
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|
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if (ret != size) { |
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offset += ret; |
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size -= ret; |
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goto retry; |
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} |
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|
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done++; |
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put_page(p); |
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sk_mem_uncharge(sk, sg->length); |
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sg = sg_next(sg); |
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} while (sg); |
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|
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memset(emsg, 0, sizeof(*emsg)); |
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|
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return 0; |
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} |
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|
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static int espintcp_push_msgs(struct sock *sk, int flags) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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struct espintcp_msg *emsg = &ctx->partial; |
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int err; |
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|
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if (!emsg->len) |
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return 0; |
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|
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if (ctx->tx_running) |
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return -EAGAIN; |
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ctx->tx_running = 1; |
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|
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if (emsg->skb) |
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err = espintcp_sendskb_locked(sk, emsg, flags); |
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else |
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err = espintcp_sendskmsg_locked(sk, emsg, flags); |
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if (err == -EAGAIN) { |
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ctx->tx_running = 0; |
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return flags & MSG_DONTWAIT ? -EAGAIN : 0; |
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} |
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if (!err) |
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memset(emsg, 0, sizeof(*emsg)); |
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|
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ctx->tx_running = 0; |
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|
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return err; |
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} |
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|
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int espintcp_push_skb(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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struct espintcp_msg *emsg = &ctx->partial; |
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unsigned int len; |
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int offset; |
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|
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if (sk->sk_state != TCP_ESTABLISHED) { |
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kfree_skb(skb); |
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return -ECONNRESET; |
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} |
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|
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offset = skb_transport_offset(skb); |
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len = skb->len - offset; |
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espintcp_push_msgs(sk, 0); |
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|
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if (emsg->len) { |
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kfree_skb(skb); |
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return -ENOBUFS; |
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} |
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skb_set_owner_w(skb, sk); |
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|
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emsg->offset = offset; |
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emsg->len = len; |
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emsg->skb = skb; |
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espintcp_push_msgs(sk, 0); |
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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(espintcp_push_skb); |
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|
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static int espintcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) |
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{ |
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long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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struct espintcp_msg *emsg = &ctx->partial; |
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struct iov_iter pfx_iter; |
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struct kvec pfx_iov = {}; |
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size_t msglen = size + 2; |
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char buf[2] = {0}; |
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int err, end; |
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|
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if (msg->msg_flags & ~MSG_DONTWAIT) |
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return -EOPNOTSUPP; |
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|
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if (size > MAX_ESPINTCP_MSG) |
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return -EMSGSIZE; |
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|
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if (msg->msg_controllen) |
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return -EOPNOTSUPP; |
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lock_sock(sk); |
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|
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err = espintcp_push_msgs(sk, msg->msg_flags & MSG_DONTWAIT); |
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if (err < 0) { |
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if (err != -EAGAIN || !(msg->msg_flags & MSG_DONTWAIT)) |
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err = -ENOBUFS; |
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goto unlock; |
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} |
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|
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sk_msg_init(&emsg->skmsg); |
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while (1) { |
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/* only -ENOMEM is possible since we don't coalesce */ |
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err = sk_msg_alloc(sk, &emsg->skmsg, msglen, 0); |
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if (!err) |
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break; |
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|
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err = sk_stream_wait_memory(sk, &timeo); |
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if (err) |
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goto fail; |
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} |
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|
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*((__be16 *)buf) = cpu_to_be16(msglen); |
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pfx_iov.iov_base = buf; |
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pfx_iov.iov_len = sizeof(buf); |
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iov_iter_kvec(&pfx_iter, WRITE, &pfx_iov, 1, pfx_iov.iov_len); |
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|
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err = sk_msg_memcopy_from_iter(sk, &pfx_iter, &emsg->skmsg, |
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pfx_iov.iov_len); |
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if (err < 0) |
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goto fail; |
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|
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err = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, &emsg->skmsg, size); |
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if (err < 0) |
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goto fail; |
|
|
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end = emsg->skmsg.sg.end; |
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emsg->len = size; |
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sk_msg_iter_var_prev(end); |
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sg_mark_end(sk_msg_elem(&emsg->skmsg, end)); |
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|
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tcp_rate_check_app_limited(sk); |
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|
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err = espintcp_push_msgs(sk, msg->msg_flags & MSG_DONTWAIT); |
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/* this message could be partially sent, keep it */ |
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|
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release_sock(sk); |
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|
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return size; |
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|
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fail: |
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sk_msg_free(sk, &emsg->skmsg); |
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memset(emsg, 0, sizeof(*emsg)); |
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unlock: |
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release_sock(sk); |
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return err; |
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} |
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|
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static struct proto espintcp_prot __ro_after_init; |
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static struct proto_ops espintcp_ops __ro_after_init; |
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static struct proto espintcp6_prot; |
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static struct proto_ops espintcp6_ops; |
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static DEFINE_MUTEX(tcpv6_prot_mutex); |
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|
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static void espintcp_data_ready(struct sock *sk) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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|
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strp_data_ready(&ctx->strp); |
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} |
|
|
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static void espintcp_tx_work(struct work_struct *work) |
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{ |
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struct espintcp_ctx *ctx = container_of(work, |
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struct espintcp_ctx, work); |
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struct sock *sk = ctx->strp.sk; |
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|
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lock_sock(sk); |
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if (!ctx->tx_running) |
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espintcp_push_msgs(sk, 0); |
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release_sock(sk); |
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} |
|
|
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static void espintcp_write_space(struct sock *sk) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
|
|
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schedule_work(&ctx->work); |
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ctx->saved_write_space(sk); |
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} |
|
|
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static void espintcp_destruct(struct sock *sk) |
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{ |
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struct espintcp_ctx *ctx = espintcp_getctx(sk); |
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|
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ctx->saved_destruct(sk); |
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kfree(ctx); |
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} |
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|
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bool tcp_is_ulp_esp(struct sock *sk) |
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{ |
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return sk->sk_prot == &espintcp_prot || sk->sk_prot == &espintcp6_prot; |
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} |
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EXPORT_SYMBOL_GPL(tcp_is_ulp_esp); |
|
|
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static void build_protos(struct proto *espintcp_prot, |
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struct proto_ops *espintcp_ops, |
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const struct proto *orig_prot, |
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const struct proto_ops *orig_ops); |
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static int espintcp_init_sk(struct sock *sk) |
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{ |
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struct inet_connection_sock *icsk = inet_csk(sk); |
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struct strp_callbacks cb = { |
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.rcv_msg = espintcp_rcv, |
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.parse_msg = espintcp_parse, |
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}; |
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struct espintcp_ctx *ctx; |
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int err; |
|
|
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/* sockmap is not compatible with espintcp */ |
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if (sk->sk_user_data) |
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return -EBUSY; |
|
|
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
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if (!ctx) |
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return -ENOMEM; |
|
|
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err = strp_init(&ctx->strp, sk, &cb); |
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if (err) |
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goto free; |
|
|
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__sk_dst_reset(sk); |
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|
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strp_check_rcv(&ctx->strp); |
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skb_queue_head_init(&ctx->ike_queue); |
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skb_queue_head_init(&ctx->out_queue); |
|
|
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if (sk->sk_family == AF_INET) { |
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sk->sk_prot = &espintcp_prot; |
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sk->sk_socket->ops = &espintcp_ops; |
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} else { |
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mutex_lock(&tcpv6_prot_mutex); |
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if (!espintcp6_prot.recvmsg) |
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build_protos(&espintcp6_prot, &espintcp6_ops, sk->sk_prot, sk->sk_socket->ops); |
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mutex_unlock(&tcpv6_prot_mutex); |
|
|
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sk->sk_prot = &espintcp6_prot; |
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sk->sk_socket->ops = &espintcp6_ops; |
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} |
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ctx->saved_data_ready = sk->sk_data_ready; |
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ctx->saved_write_space = sk->sk_write_space; |
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ctx->saved_destruct = sk->sk_destruct; |
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sk->sk_data_ready = espintcp_data_ready; |
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sk->sk_write_space = espintcp_write_space; |
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sk->sk_destruct = espintcp_destruct; |
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rcu_assign_pointer(icsk->icsk_ulp_data, ctx); |
|
INIT_WORK(&ctx->work, espintcp_tx_work); |
|
|
|
/* avoid using task_frag */ |
|
sk->sk_allocation = GFP_ATOMIC; |
|
|
|
return 0; |
|
|
|
free: |
|
kfree(ctx); |
|
return err; |
|
} |
|
|
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static void espintcp_release(struct sock *sk) |
|
{ |
|
struct espintcp_ctx *ctx = espintcp_getctx(sk); |
|
struct sk_buff_head queue; |
|
struct sk_buff *skb; |
|
|
|
__skb_queue_head_init(&queue); |
|
skb_queue_splice_init(&ctx->out_queue, &queue); |
|
|
|
while ((skb = __skb_dequeue(&queue))) |
|
espintcp_push_skb(sk, skb); |
|
|
|
tcp_release_cb(sk); |
|
} |
|
|
|
static void espintcp_close(struct sock *sk, long timeout) |
|
{ |
|
struct espintcp_ctx *ctx = espintcp_getctx(sk); |
|
struct espintcp_msg *emsg = &ctx->partial; |
|
|
|
strp_stop(&ctx->strp); |
|
|
|
sk->sk_prot = &tcp_prot; |
|
barrier(); |
|
|
|
cancel_work_sync(&ctx->work); |
|
strp_done(&ctx->strp); |
|
|
|
skb_queue_purge(&ctx->out_queue); |
|
skb_queue_purge(&ctx->ike_queue); |
|
|
|
if (emsg->len) { |
|
if (emsg->skb) |
|
kfree_skb(emsg->skb); |
|
else |
|
sk_msg_free(sk, &emsg->skmsg); |
|
} |
|
|
|
tcp_close(sk, timeout); |
|
} |
|
|
|
static __poll_t espintcp_poll(struct file *file, struct socket *sock, |
|
poll_table *wait) |
|
{ |
|
__poll_t mask = datagram_poll(file, sock, wait); |
|
struct sock *sk = sock->sk; |
|
struct espintcp_ctx *ctx = espintcp_getctx(sk); |
|
|
|
if (!skb_queue_empty(&ctx->ike_queue)) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
|
|
return mask; |
|
} |
|
|
|
static void build_protos(struct proto *espintcp_prot, |
|
struct proto_ops *espintcp_ops, |
|
const struct proto *orig_prot, |
|
const struct proto_ops *orig_ops) |
|
{ |
|
memcpy(espintcp_prot, orig_prot, sizeof(struct proto)); |
|
memcpy(espintcp_ops, orig_ops, sizeof(struct proto_ops)); |
|
espintcp_prot->sendmsg = espintcp_sendmsg; |
|
espintcp_prot->recvmsg = espintcp_recvmsg; |
|
espintcp_prot->close = espintcp_close; |
|
espintcp_prot->release_cb = espintcp_release; |
|
espintcp_ops->poll = espintcp_poll; |
|
} |
|
|
|
static struct tcp_ulp_ops espintcp_ulp __read_mostly = { |
|
.name = "espintcp", |
|
.owner = THIS_MODULE, |
|
.init = espintcp_init_sk, |
|
}; |
|
|
|
void __init espintcp_init(void) |
|
{ |
|
build_protos(&espintcp_prot, &espintcp_ops, &tcp_prot, &inet_stream_ops); |
|
|
|
tcp_register_ulp(&espintcp_ulp); |
|
}
|
|
|