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-rw-r--r--net/mptcp/options.c120
1 files changed, 91 insertions, 29 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 888bbbbb3e8a..092a2d48bfd3 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -11,6 +11,7 @@
#include <net/tcp.h>
#include <net/mptcp.h>
#include "protocol.h"
+#include "mib.h"
static bool mptcp_cap_flag_sha256(u8 flags)
{
@@ -242,7 +243,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
mp_opt->add_addr = 1;
mp_opt->port = 0;
mp_opt->addr_id = *ptr++;
- pr_debug("ADD_ADDR: id=%d", mp_opt->addr_id);
+ pr_debug("ADD_ADDR: id=%d, echo=%d", mp_opt->addr_id, mp_opt->echo);
if (mp_opt->family == MPTCP_ADDR_IPVERSION_4) {
memcpy((u8 *)&mp_opt->addr.s_addr, (u8 *)ptr, 4);
ptr += 4;
@@ -516,7 +517,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
return ret;
}
- if (subflow->use_64bit_ack) {
+ if (READ_ONCE(msk->use_64bit_ack)) {
ack_size = TCPOLEN_MPTCP_DSS_ACK64;
opts->ext_copy.data_ack = READ_ONCE(msk->ack_seq);
opts->ext_copy.ack64 = 1;
@@ -571,21 +572,22 @@ static u64 add_addr6_generate_hmac(u64 key1, u64 key2, u8 addr_id,
}
#endif
-static bool mptcp_established_options_addr(struct sock *sk,
- unsigned int *size,
- unsigned int remaining,
- struct mptcp_out_options *opts)
+static bool mptcp_established_options_add_addr(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);
struct mptcp_addr_info saddr;
+ bool echo;
int len;
- if (!mptcp_pm_should_signal(msk) ||
- !(mptcp_pm_addr_signal(msk, remaining, &saddr)))
+ if (!mptcp_pm_should_add_signal(msk) ||
+ !(mptcp_pm_add_addr_signal(msk, remaining, &saddr, &echo)))
return false;
- len = mptcp_add_addr_len(saddr.family);
+ len = mptcp_add_addr_len(saddr.family, echo);
if (remaining < len)
return false;
@@ -594,22 +596,51 @@ static bool mptcp_established_options_addr(struct sock *sk,
if (saddr.family == AF_INET) {
opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
opts->addr = saddr.addr;
- opts->ahmac = add_addr_generate_hmac(msk->local_key,
- msk->remote_key,
- opts->addr_id,
- &opts->addr);
+ if (!echo) {
+ opts->ahmac = add_addr_generate_hmac(msk->local_key,
+ msk->remote_key,
+ opts->addr_id,
+ &opts->addr);
+ }
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
else if (saddr.family == AF_INET6) {
opts->suboptions |= OPTION_MPTCP_ADD_ADDR6;
opts->addr6 = saddr.addr6;
- opts->ahmac = add_addr6_generate_hmac(msk->local_key,
- msk->remote_key,
- opts->addr_id,
- &opts->addr6);
+ if (!echo) {
+ opts->ahmac = add_addr6_generate_hmac(msk->local_key,
+ msk->remote_key,
+ opts->addr_id,
+ &opts->addr6);
+ }
}
#endif
- pr_debug("addr_id=%d, ahmac=%llu", opts->addr_id, opts->ahmac);
+ pr_debug("addr_id=%d, ahmac=%llu, echo=%d", opts->addr_id, opts->ahmac, echo);
+
+ return true;
+}
+
+static bool mptcp_established_options_rm_addr(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);
+ u8 rm_id;
+
+ if (!mptcp_pm_should_rm_signal(msk) ||
+ !(mptcp_pm_rm_addr_signal(msk, remaining, &rm_id)))
+ return false;
+
+ if (remaining < TCPOLEN_MPTCP_RM_ADDR_BASE)
+ return false;
+
+ *size = TCPOLEN_MPTCP_RM_ADDR_BASE;
+ opts->suboptions |= OPTION_MPTCP_RM_ADDR;
+ opts->rm_id = rm_id;
+
+ pr_debug("rm_id=%d", opts->rm_id);
return true;
}
@@ -626,6 +657,12 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
if (unlikely(mptcp_check_fallback(sk)))
return false;
+ /* prevent adding of any MPTCP related options on reset packet
+ * until we support MP_TCPRST/MP_FASTCLOSE
+ */
+ if (unlikely(skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_RST))
+ return false;
+
if (mptcp_established_options_mp(sk, skb, &opt_size, remaining, opts))
ret = true;
else if (mptcp_established_options_dss(sk, skb, &opt_size, remaining,
@@ -640,7 +677,11 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
*size += opt_size;
remaining -= opt_size;
- if (mptcp_established_options_addr(sk, &opt_size, remaining, opts)) {
+ if (mptcp_established_options_add_addr(sk, &opt_size, remaining, opts)) {
+ *size += opt_size;
+ remaining -= opt_size;
+ ret = true;
+ } else if (mptcp_established_options_rm_addr(sk, &opt_size, remaining, opts)) {
*size += opt_size;
remaining -= opt_size;
ret = true;
@@ -676,7 +717,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
return false;
}
-static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk,
+static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
struct mptcp_subflow_context *subflow,
struct sk_buff *skb,
struct mptcp_options_received *mp_opt)
@@ -693,15 +734,20 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk,
TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq &&
subflow->mp_join && mp_opt->mp_join &&
READ_ONCE(msk->pm.server_side))
- tcp_send_ack(sk);
+ tcp_send_ack(ssk);
goto fully_established;
}
- /* we should process OoO packets before the first subflow is fully
- * established, but not expected for MP_JOIN subflows
+ /* we must process OoO packets before the first subflow is fully
+ * established. OoO packets are instead a protocol violation
+ * for MP_JOIN subflows as the peer must not send any data
+ * before receiving the forth ack - cfr. RFC 8684 section 3.2.
*/
- if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1)
+ if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1) {
+ if (subflow->mp_join)
+ goto reset;
return subflow->mp_capable;
+ }
if (mp_opt->dss && mp_opt->use_ack) {
/* subflows are fully established as soon as we get any
@@ -713,9 +759,12 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk,
}
/* If the first established packet does not contain MP_CAPABLE + data
- * then fallback to TCP
+ * then fallback to TCP. Fallback scenarios requires a reset for
+ * MP_JOIN subflows.
*/
if (!mp_opt->mp_capable) {
+ if (subflow->mp_join)
+ goto reset;
subflow->mp_capable = 0;
pr_fallback(msk);
__mptcp_do_fallback(msk);
@@ -732,12 +781,16 @@ fully_established:
subflow->pm_notified = 1;
if (subflow->mp_join) {
- clear_3rdack_retransmission(sk);
+ clear_3rdack_retransmission(ssk);
mptcp_pm_subflow_established(msk, subflow);
} else {
mptcp_pm_fully_established(msk);
}
return true;
+
+reset:
+ mptcp_subflow_reset(ssk);
+ return false;
}
static u64 expand_ack(u64 old_ack, u64 cur_ack, bool use_64bit)
@@ -825,8 +878,7 @@ static bool add_addr_hmac_valid(struct mptcp_sock *msk,
return hmac == mp_opt->ahmac;
}
-void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
- struct tcp_options_received *opt_rx)
+void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct mptcp_sock *msk = mptcp_sk(subflow->conn);
@@ -855,11 +907,21 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
addr.addr6 = mp_opt.addr6;
}
#endif
- if (!mp_opt.echo)
+ if (!mp_opt.echo) {
mptcp_pm_add_addr_received(msk, &addr);
+ MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
+ } else {
+ mptcp_pm_del_add_timer(msk, &addr);
+ MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+ }
mp_opt.add_addr = 0;
}
+ if (mp_opt.rm_addr) {
+ mptcp_pm_rm_addr_received(msk, mp_opt.rm_id);
+ mp_opt.rm_addr = 0;
+ }
+
if (!mp_opt.dss)
return;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 10:29:16 +0100