aboutsummaryrefslogtreecommitdiffstats
path: root/net/mptcp/options.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mptcp/options.c')
-rw-r--r--net/mptcp/options.c119
1 files changed, 79 insertions, 40 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index fe98e4f475ba..645dd984fef0 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -768,6 +768,28 @@ static noinline bool mptcp_established_options_rst(struct sock *sk, struct sk_bu
return true;
}
+static bool mptcp_established_options_fastclose(struct sock *sk,
+ unsigned int *size,
+ unsigned int remaining,
+ struct mptcp_out_options *opts)
+{
+ struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
+ struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+
+ if (likely(!subflow->send_fastclose))
+ return false;
+
+ if (remaining < TCPOLEN_MPTCP_FASTCLOSE)
+ return false;
+
+ *size = TCPOLEN_MPTCP_FASTCLOSE;
+ opts->suboptions |= OPTION_MPTCP_FASTCLOSE;
+ opts->rcvr_key = msk->remote_key;
+
+ pr_debug("FASTCLOSE key=%llu", opts->rcvr_key);
+ return true;
+}
+
static bool mptcp_established_options_mp_fail(struct sock *sk,
unsigned int *size,
unsigned int remaining,
@@ -806,10 +828,12 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
return false;
if (unlikely(skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST)) {
- if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
+ if (mptcp_established_options_fastclose(sk, &opt_size, remaining, opts) ||
+ mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
}
+ /* MP_RST can be used with MP_FASTCLOSE and MP_FAIL if there is room */
if (mptcp_established_options_rst(sk, skb, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
@@ -821,10 +845,13 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
if (mptcp_established_options_mp(sk, skb, snd_data_fin, &opt_size, remaining, opts))
ret = true;
else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts)) {
+ unsigned int mp_fail_size;
+
ret = true;
- if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {
- *size += opt_size;
- remaining -= opt_size;
+ if (mptcp_established_options_mp_fail(sk, &mp_fail_size,
+ remaining - opt_size, opts)) {
+ *size += opt_size + mp_fail_size;
+ remaining -= opt_size - mp_fail_size;
return true;
}
}
@@ -1209,7 +1236,7 @@ static void mptcp_set_rwin(const struct tcp_sock *tp)
WRITE_ONCE(msk->rcv_wnd_sent, ack_seq);
}
-static u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __sum16 sum)
+u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum)
{
struct csum_pseudo_header header;
__wsum csum;
@@ -1224,14 +1251,14 @@ static u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __sum1
header.data_len = htons(data_len);
header.csum = 0;
- csum = csum_partial(&header, sizeof(header), ~csum_unfold(sum));
+ csum = csum_partial(&header, sizeof(header), sum);
return (__force u16)csum_fold(csum);
}
static u16 mptcp_make_csum(const struct mptcp_ext *mpext)
{
return __mptcp_make_csum(mpext->data_seq, mpext->subflow_seq, mpext->data_len,
- mpext->csum);
+ ~csum_unfold(mpext->csum));
}
void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
@@ -1251,17 +1278,8 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
ptr += 2;
}
- /* RST is mutually exclusive with everything else */
- if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {
- *ptr++ = mptcp_option(MPTCPOPT_RST,
- TCPOLEN_MPTCP_RST,
- opts->reset_transient,
- opts->reset_reason);
- return;
- }
-
- /* DSS, MPC, MPJ and ADD_ADDR are mutually exclusive, see
- * mptcp_established_options*()
+ /* DSS, MPC, MPJ, ADD_ADDR, FASTCLOSE and RST are mutually exclusive,
+ * see mptcp_established_options*()
*/
if (likely(OPTION_MPTCP_DSS & opts->suboptions)) {
struct mptcp_ext *mpext = &opts->ext_copy;
@@ -1316,6 +1334,7 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
put_unaligned_be32(mpext->data_len << 16 |
TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
}
+ ptr += 1;
}
} else if (OPTIONS_MPTCP_MPC & opts->suboptions) {
u8 len, flag = MPTCP_CAP_HMAC_SHA256;
@@ -1361,7 +1380,7 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
__mptcp_make_csum(opts->data_seq,
opts->subflow_seq,
opts->data_len,
- opts->csum), ptr);
+ ~csum_unfold(opts->csum)), ptr);
} else {
put_unaligned_be32(opts->data_len << 16 |
TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
@@ -1370,27 +1389,29 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
/* MPC is additionally mutually exclusive with MP_PRIO */
goto mp_capable_done;
- } else if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) {
- *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
- TCPOLEN_MPTCP_MPJ_SYN,
- opts->backup, opts->join_id);
- put_unaligned_be32(opts->token, ptr);
- ptr += 1;
- put_unaligned_be32(opts->nonce, ptr);
- ptr += 1;
- } else if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) {
- *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
- TCPOLEN_MPTCP_MPJ_SYNACK,
- opts->backup, opts->join_id);
- put_unaligned_be64(opts->thmac, ptr);
- ptr += 2;
- put_unaligned_be32(opts->nonce, ptr);
- ptr += 1;
- } else if (OPTION_MPTCP_MPJ_ACK & opts->suboptions) {
- *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
- TCPOLEN_MPTCP_MPJ_ACK, 0, 0);
- memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN);
- ptr += 5;
+ } else if (OPTIONS_MPTCP_MPJ & opts->suboptions) {
+ if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_SYN,
+ opts->backup, opts->join_id);
+ put_unaligned_be32(opts->token, ptr);
+ ptr += 1;
+ put_unaligned_be32(opts->nonce, ptr);
+ ptr += 1;
+ } else if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_SYNACK,
+ opts->backup, opts->join_id);
+ put_unaligned_be64(opts->thmac, ptr);
+ ptr += 2;
+ put_unaligned_be32(opts->nonce, ptr);
+ ptr += 1;
+ } else {
+ *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN,
+ TCPOLEN_MPTCP_MPJ_ACK, 0, 0);
+ memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN);
+ ptr += 5;
+ }
} else if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {
u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
u8 echo = MPTCP_ADDR_ECHO;
@@ -1447,6 +1468,24 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
ptr += 1;
}
}
+ } else if (unlikely(OPTION_MPTCP_FASTCLOSE & opts->suboptions)) {
+ /* FASTCLOSE is mutually exclusive with others except RST */
+ *ptr++ = mptcp_option(MPTCPOPT_MP_FASTCLOSE,
+ TCPOLEN_MPTCP_FASTCLOSE,
+ 0, 0);
+ put_unaligned_be64(opts->rcvr_key, ptr);
+ ptr += 2;
+
+ if (OPTION_MPTCP_RST & opts->suboptions)
+ goto mp_rst;
+ return;
+ } else if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {
+mp_rst:
+ *ptr++ = mptcp_option(MPTCPOPT_RST,
+ TCPOLEN_MPTCP_RST,
+ opts->reset_transient,
+ opts->reset_reason);
+ return;
}
if (OPTION_MPTCP_PRIO & opts->suboptions) {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.