From: Philo Lu <lulie@linux.alibaba.com> mainline inclusion from mainline-v6.13-rc1 commit accdd51dc74ff65b7b7be1961b11723d228fbbbd category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/ICIAC2 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------- Preparing for udp 4-tuple hash (uhash4 for short). To implement uhash4 without cache line missing when lookup, hslot2 is used to record the number of hashed sockets in hslot4. Thus adding a new struct udp_hslot_main with field hash4_cnt, which is used by hash2. The new struct is used to avoid doubling the size of udp_hslot. Before uhash4 lookup, firstly checking hash4_cnt to see if there are hashed sks in hslot4. Because hslot2 is always used in lookup, there is no cache line miss. Related helpers are updated, and use the helpers as possible. uhash4 is implemented in following patches. Signed-off-by: Philo Lu <lulie@linux.alibaba.com> Acked-by: Willem de Bruijn <willemb@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Conflicts: net/ipv4/udp.c net/ipv6/udp.c include/net/udp.h [Mainly caused by OLK did not backport 9804985bf27f and 5788b3a07fc5.] Signed-off-by: Liu Jian <liujian56@huawei.com> --- include/net/udp.h | 40 ++++++++++++++++++++++++++++++++++++---- net/ipv4/udp.c | 27 +++++++++++++-------------- net/ipv6/udp.c | 13 +++++-------- 3 files changed, 54 insertions(+), 26 deletions(-) diff --git a/include/net/udp.h b/include/net/udp.h index e2550a4547a7..52134fc3a409 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -49,7 +49,7 @@ struct udp_skb_cb { #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) /** - * struct udp_hslot - UDP hash slot + * struct udp_hslot - UDP hash slot used by udp_table.hash * * @head: head of list of sockets * @count: number of sockets in 'head' list @@ -59,7 +59,22 @@ struct udp_hslot { struct hlist_head head; int count; spinlock_t lock; -} __attribute__((aligned(2 * sizeof(long)))); +} __aligned(2 * sizeof(long)); + +/** + * struct udp_hslot_main - UDP hash slot used by udp_table.hash2 + * + * @hslot: basic hash slot + * @hash4_cnt: number of sockets in hslot4 of the same + * (local port, local address) + */ +struct udp_hslot_main { + struct udp_hslot hslot; /* must be the first member */ +#if !IS_ENABLED(CONFIG_BASE_SMALL) + u32 hash4_cnt; +#endif +} __aligned(2 * sizeof(long)); +#define UDP_HSLOT_MAIN(__hslot) ((struct udp_hslot_main *)(__hslot)) /** * struct udp_table - UDP table @@ -71,7 +86,7 @@ struct udp_hslot { */ struct udp_table { struct udp_hslot *hash; - struct udp_hslot *hash2; + struct udp_hslot_main *hash2; unsigned int mask; unsigned int log; }; @@ -82,6 +97,7 @@ static inline struct udp_hslot *udp_hashslot(struct udp_table *table, { return &table->hash[udp_hashfn(net, num, table->mask)]; } + /* * For secondary hash, net_hash_mix() is performed before calling * udp_hashslot2(), this explains difference with udp_hashslot() @@ -89,8 +105,24 @@ static inline struct udp_hslot *udp_hashslot(struct udp_table *table, static inline struct udp_hslot *udp_hashslot2(struct udp_table *table, unsigned int hash) { - return &table->hash2[hash & table->mask]; + return &table->hash2[hash & table->mask].hslot; +} + +#if IS_ENABLED(CONFIG_BASE_SMALL) +static inline void udp_table_hash4_init(struct udp_table *table) +{ +} +#else /* !CONFIG_BASE_SMALL */ + +/* Must be called with table->hash2 initialized */ +static inline void udp_table_hash4_init(struct udp_table *table) +{ + int i; + + for (i = 0; i <= table->mask; i++) + table->hash2[i].hash4_cnt = 0; } +#endif /* CONFIG_BASE_SMALL */ extern struct proto udp_prot; diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 907be248689a..3cd393e1944e 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -499,13 +499,12 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, int sdif, struct udp_table *udptable, struct sk_buff *skb) { unsigned short hnum = ntohs(dport); - unsigned int hash2, slot2; struct udp_hslot *hslot2; struct sock *result, *sk; + unsigned int hash2; hash2 = ipv4_portaddr_hash(net, daddr, hnum); - slot2 = hash2 & udptable->mask; - hslot2 = &udptable->hash2[slot2]; + hslot2 = udp_hashslot2(udptable, hash2); /* Lookup connected or non-wildcard socket */ result = udp4_lib_lookup2(net, saddr, sport, @@ -530,8 +529,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, /* Lookup wildcard sockets */ hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum); - slot2 = hash2 & udptable->mask; - hslot2 = &udptable->hash2[slot2]; + hslot2 = udp_hashslot2(udptable, hash2); result = udp4_lib_lookup2(net, saddr, sport, htonl(INADDR_ANY), hnum, dif, sdif, @@ -2249,7 +2247,7 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, udptable->mask; hash2 = ipv4_portaddr_hash(net, daddr, hnum) & udptable->mask; start_lookup: - hslot = &udptable->hash2[hash2]; + hslot = &udptable->hash2[hash2].hslot; offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); } @@ -2505,8 +2503,7 @@ static struct sock *__udp4_lib_demux_lookup(struct net *net, { unsigned short hnum = ntohs(loc_port); unsigned int hash2 = ipv4_portaddr_hash(net, loc_addr, hnum); - unsigned int slot2 = hash2 & udp_table.mask; - struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; + struct udp_hslot *hslot2 = udp_hashslot2(&udp_table, hash2); INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); struct sock *sk; @@ -3170,10 +3167,11 @@ __setup("uhash_entries=", set_uhash_entries); void __init udp_table_init(struct udp_table *table, const char *name) { - unsigned int i; + unsigned int i, slot_size; + slot_size = sizeof(struct udp_hslot) + sizeof(struct udp_hslot_main); table->hash = alloc_large_system_hash(name, - 2 * sizeof(struct udp_hslot), + slot_size, uhash_entries, 21, /* one slot per 2 MB */ 0, @@ -3182,17 +3180,18 @@ void __init udp_table_init(struct udp_table *table, const char *name) UDP_HTABLE_SIZE_MIN, 64 * 1024); - table->hash2 = table->hash + (table->mask + 1); + table->hash2 = (void *)(table->hash + (table->mask + 1)); for (i = 0; i <= table->mask; i++) { INIT_HLIST_HEAD(&table->hash[i].head); table->hash[i].count = 0; spin_lock_init(&table->hash[i].lock); } for (i = 0; i <= table->mask; i++) { - INIT_HLIST_HEAD(&table->hash2[i].head); - table->hash2[i].count = 0; - spin_lock_init(&table->hash2[i].lock); + INIT_HLIST_HEAD(&table->hash2[i].hslot.head); + table->hash2[i].hslot.count = 0; + spin_lock_init(&table->hash2[i].hslot.lock); } + udp_table_hash4_init(table); } u32 udp_flow_hashrnd(void) diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 43eab741b32b..f3877e8c6d70 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -244,13 +244,12 @@ struct sock *__udp6_lib_lookup(struct net *net, struct sk_buff *skb) { unsigned short hnum = ntohs(dport); - unsigned int hash2, slot2; struct udp_hslot *hslot2; struct sock *result, *sk; + unsigned int hash2; hash2 = ipv6_portaddr_hash(net, daddr, hnum); - slot2 = hash2 & udptable->mask; - hslot2 = &udptable->hash2[slot2]; + hslot2 = udp_hashslot2(udptable, hash2); /* Lookup connected or non-wildcard sockets */ result = udp6_lib_lookup2(net, saddr, sport, @@ -275,8 +274,7 @@ struct sock *__udp6_lib_lookup(struct net *net, /* Lookup wildcard sockets */ hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); - slot2 = hash2 & udptable->mask; - hslot2 = &udptable->hash2[slot2]; + hslot2 = udp_hashslot2(udptable, hash2); result = udp6_lib_lookup2(net, saddr, sport, &in6addr_any, hnum, dif, sdif, @@ -836,7 +834,7 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, udptable->mask; hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; start_lookup: - hslot = &udptable->hash2[hash2]; + hslot = &udptable->hash2[hash2].hslot; offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); } @@ -1033,8 +1031,7 @@ static struct sock *__udp6_lib_demux_lookup(struct net *net, { unsigned short hnum = ntohs(loc_port); unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); - unsigned int slot2 = hash2 & udp_table.mask; - struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; + struct udp_hslot *hslot2 = udp_hashslot2(&udp_table, hash2); const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); struct sock *sk; -- 2.34.1

From: Philo Lu <lulie@linux.alibaba.com> mainline inclusion from mainline-v6.13-rc1 commit 78c91ae2c6deb5d236a5a93ff2995cdd05514380 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/ICIAC2 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------- Currently, the udp_table has two hash table, the port hash and portaddr hash. Usually for UDP servers, all sockets have the same local port and addr, so they are all on the same hash slot within a reuseport group. In some applications, UDP servers use connect() to manage clients. In particular, when firstly receiving from an unseen 4 tuple, a new socket is created and connect()ed to the remote addr:port, and then the fd is used exclusively by the client. Once there are connected sks in a reuseport group, udp has to score all sks in the same hash2 slot to find the best match. This could be inefficient with a large number of connections, resulting in high softirq overhead. To solve the problem, this patch implement 4-tuple hash for connected udp sockets. During connect(), hash4 slot is updated, as well as a corresponding counter, hash4_cnt, in hslot2. In __udp4_lib_lookup(), hslot4 will be searched firstly if the counter is non-zero. Otherwise, hslot2 is used like before. Note that only connected sockets enter this hash4 path, while un-connected ones are not affected. hlist_nulls is used for hash4, because we probably move to another hslot wrongly when lookup with concurrent rehash. Then we check nulls at the list end to see if we should restart lookup. Because udp does not use SLAB_TYPESAFE_BY_RCU, we don't need to touch sk_refcnt when lookup. Stress test results (with 1 cpu fully used) are shown below, in pps: (1) _un-connected_ socket as server [a] w/o hash4: 1,825176 [b] w/ hash4: 1,831750 (+0.36%) (2) 500 _connected_ sockets as server [c] w/o hash4: 290860 (only 16% of [a]) [d] w/ hash4: 1,889658 (+3.1% compared with [b]) With hash4, compute_score is skipped when lookup, so [d] is slightly better than [b]. Co-developed-by: Cambda Zhu <cambda@linux.alibaba.com> Signed-off-by: Cambda Zhu <cambda@linux.alibaba.com> Co-developed-by: Fred Chen <fred.cc@alibaba-inc.com> Signed-off-by: Fred Chen <fred.cc@alibaba-inc.com> Co-developed-by: Yubing Qiu <yubing.qiuyubing@alibaba-inc.com> Signed-off-by: Yubing Qiu <yubing.qiuyubing@alibaba-inc.com> Signed-off-by: Philo Lu <lulie@linux.alibaba.com> Acked-by: Willem de Bruijn <willemb@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Conflicts: net/ipv4/udp.c net/ipv6/udp.c [Mainly caused by OLK did not backport 9804985bf27f and eda090c31fe9. And fix one declaration-after-statement compilation warning.] Signed-off-by: Liu Jian <liujian56@huawei.com> --- include/net/udp.h | 16 +++- net/ipv4/udp.c | 197 +++++++++++++++++++++++++++++++++++++++++++++- net/ipv6/udp.c | 2 +- 3 files changed, 210 insertions(+), 5 deletions(-) diff --git a/include/net/udp.h b/include/net/udp.h index 4eaabd012ac0..4946df3970f9 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -314,13 +314,27 @@ static inline int udp_lib_hash(struct sock *sk) } void udp_lib_unhash(struct sock *sk); -void udp_lib_rehash(struct sock *sk, u16 new_hash); +void udp_lib_rehash(struct sock *sk, u16 new_hash, u16 new_hash4); static inline void udp_lib_close(struct sock *sk, long timeout) { sk_common_release(sk); } +/* hash4 routines shared between UDPv4/6 */ +#if IS_ENABLED(CONFIG_BASE_SMALL) +static inline void udp_lib_hash4(struct sock *sk, u16 hash) +{ +} + +static inline void udp4_hash4(struct sock *sk) +{ +} +#else /* !CONFIG_BASE_SMALL */ +void udp_lib_hash4(struct sock *sk, u16 hash); +void udp4_hash4(struct sock *sk); +#endif /* CONFIG_BASE_SMALL */ + int udp_lib_get_port(struct sock *sk, unsigned short snum, unsigned int hash2_nulladdr); diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 305b2eaaef58..07f1f3a79b32 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -491,6 +491,159 @@ static struct sock *udp4_lookup_run_bpf(struct net *net, return sk; } +#if IS_ENABLED(CONFIG_BASE_SMALL) +static struct sock *udp4_lib_lookup4(const struct net *net, + __be32 saddr, __be16 sport, + __be32 daddr, unsigned int hnum, + int dif, int sdif, + struct udp_table *udptable) +{ + return NULL; +} + +static void udp_rehash4(struct udp_table *udptable, struct sock *sk, + u16 newhash4) +{ +} + +static void udp_unhash4(struct udp_table *udptable, struct sock *sk) +{ +} +#else /* !CONFIG_BASE_SMALL */ +static struct sock *udp4_lib_lookup4(const struct net *net, + __be32 saddr, __be16 sport, + __be32 daddr, unsigned int hnum, + int dif, int sdif, + struct udp_table *udptable) +{ + const __portpair ports = INET_COMBINED_PORTS(sport, hnum); + const struct hlist_nulls_node *node; + struct udp_hslot *hslot4; + unsigned int hash4, slot; + struct udp_sock *up; + struct sock *sk; + + INET_ADDR_COOKIE(acookie, saddr, daddr); + hash4 = udp_ehashfn(net, daddr, hnum, saddr, sport); + slot = hash4 & udptable->mask; + hslot4 = &udptable->hash4[slot]; + +begin: + /* SLAB_TYPESAFE_BY_RCU not used, so we don't need to touch sk_refcnt */ + udp_lrpa_for_each_entry_rcu(up, node, &hslot4->nulls_head) { + sk = (struct sock *)up; + if (INET_MATCH((struct net *)net, sk, acookie, ports, dif, sdif)) + return sk; + } + + /* if the nulls value we got at the end of this lookup is not the + * expected one, we must restart lookup. We probably met an item that + * was moved to another chain due to rehash. + */ + if (get_nulls_value(node) != slot) + goto begin; + + return NULL; +} + +/* In hash4, rehash can happen in connect(), where hash4_cnt keeps unchanged. */ +static void udp_rehash4(struct udp_table *udptable, struct sock *sk, + u16 newhash4) +{ + struct udp_hslot *hslot4, *nhslot4; + + hslot4 = udp_hashslot4(udptable, udp_sk(sk)->udp_lrpa_hash); + nhslot4 = udp_hashslot4(udptable, newhash4); + udp_sk(sk)->udp_lrpa_hash = newhash4; + + if (hslot4 != nhslot4) { + spin_lock_bh(&hslot4->lock); + hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_lrpa_node); + hslot4->count--; + spin_unlock_bh(&hslot4->lock); + + spin_lock_bh(&nhslot4->lock); + hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_lrpa_node, + &nhslot4->nulls_head); + nhslot4->count++; + spin_unlock_bh(&nhslot4->lock); + } +} + +static void udp_unhash4(struct udp_table *udptable, struct sock *sk) +{ + struct udp_hslot *hslot2, *hslot4; + + if (udp_hashed4(sk)) { + hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); + hslot4 = udp_hashslot4(udptable, udp_sk(sk)->udp_lrpa_hash); + + spin_lock(&hslot4->lock); + hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_lrpa_node); + hslot4->count--; + spin_unlock(&hslot4->lock); + + spin_lock(&hslot2->lock); + udp_hash4_dec(hslot2); + spin_unlock(&hslot2->lock); + } +} + +void udp_lib_hash4(struct sock *sk, u16 hash) +{ + struct udp_hslot *hslot, *hslot2, *hslot4; + struct net *net = sock_net(sk); + struct udp_table *udptable; + + /* Connected udp socket can re-connect to another remote address, + * so rehash4 is needed. + */ + udptable = &udp_table; + if (udp_hashed4(sk)) { + udp_rehash4(udptable, sk, hash); + return; + } + + hslot = udp_hashslot(udptable, net, udp_sk(sk)->udp_port_hash); + hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); + hslot4 = udp_hashslot4(udptable, hash); + udp_sk(sk)->udp_lrpa_hash = hash; + + spin_lock_bh(&hslot->lock); + if (rcu_access_pointer(sk->sk_reuseport_cb)) + reuseport_detach_sock(sk); + + spin_lock(&hslot4->lock); + hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_lrpa_node, + &hslot4->nulls_head); + hslot4->count++; + spin_unlock(&hslot4->lock); + + spin_lock(&hslot2->lock); + udp_hash4_inc(hslot2); + spin_unlock(&hslot2->lock); + + spin_unlock_bh(&hslot->lock); +} +EXPORT_SYMBOL(udp_lib_hash4); + +/* call with sock lock */ +void udp4_hash4(struct sock *sk) +{ + struct net *net = sock_net(sk); + unsigned int hash; + + if (sk_unhashed(sk) || sk->sk_rcv_saddr == htonl(INADDR_ANY)) + return; + + hash = udp_ehashfn(net, sk->sk_rcv_saddr, sk->sk_num, + sk->sk_daddr, sk->sk_dport); + + udp_lib_hash4(sk, hash); +} +EXPORT_SYMBOL(udp4_hash4); +#endif /* CONFIG_BASE_SMALL */ + /* UDP is nearly always wildcards out the wazoo, it makes no sense to try * harder than this. -DaveM */ @@ -506,6 +659,13 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, hash2 = ipv4_portaddr_hash(net, daddr, hnum); hslot2 = udp_hashslot2(udptable, hash2); + if (udp_has_hash4(hslot2)) { + result = udp4_lib_lookup4(net, saddr, sport, daddr, hnum, + dif, sdif, udptable); + if (result) /* udp4_lib_lookup4 return sk or NULL */ + return result; + } + /* Lookup connected or non-wildcard socket */ result = udp4_lib_lookup2(net, saddr, sport, daddr, hnum, dif, sdif, @@ -1931,6 +2091,18 @@ int udp_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) } EXPORT_SYMBOL(udp_pre_connect); +static int udp_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + int res; + + lock_sock(sk); + res = __ip4_datagram_connect(sk, uaddr, addr_len); + if (!res) + udp4_hash4(sk); + release_sock(sk); + return res; +} + int __udp_disconnect(struct sock *sk, int flags) { struct inet_sock *inet = inet_sk(sk); @@ -1990,6 +2162,8 @@ void udp_lib_unhash(struct sock *sk) hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); hslot2->count--; spin_unlock(&hslot2->lock); + + udp_unhash4(udptable, sk); } spin_unlock_bh(&hslot->lock); } @@ -1999,7 +2173,7 @@ EXPORT_SYMBOL(udp_lib_unhash); /* * inet_rcv_saddr was changed, we must rehash secondary hash */ -void udp_lib_rehash(struct sock *sk, u16 newhash) +void udp_lib_rehash(struct sock *sk, u16 newhash, u16 newhash4) { if (sk_hashed(sk)) { struct udp_table *udptable = sk->sk_prot->h.udp_table; @@ -2031,6 +2205,19 @@ void udp_lib_rehash(struct sock *sk, u16 newhash) spin_unlock(&nhslot2->lock); } + if (udp_hashed4(sk)) { + udp_rehash4(udptable, sk, newhash4); + + if (hslot2 != nhslot2) { + spin_lock(&hslot2->lock); + udp_hash4_dec(hslot2); + spin_unlock(&hslot2->lock); + + spin_lock(&nhslot2->lock); + udp_hash4_inc(nhslot2); + spin_unlock(&nhslot2->lock); + } + } spin_unlock_bh(&hslot->lock); } } @@ -2042,7 +2229,11 @@ void udp_v4_rehash(struct sock *sk) u16 new_hash = ipv4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, inet_sk(sk)->inet_num); - udp_lib_rehash(sk, new_hash); + u16 new_hash4 = udp_ehashfn(sock_net(sk), + sk->sk_rcv_saddr, sk->sk_num, + sk->sk_daddr, sk->sk_dport); + + udp_lib_rehash(sk, new_hash, new_hash4); } static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) @@ -2871,7 +3062,7 @@ struct proto udp_prot = { .owner = THIS_MODULE, .close = udp_lib_close, .pre_connect = udp_pre_connect, - .connect = ip4_datagram_connect, + .connect = udp_connect, .disconnect = udp_disconnect, .ioctl = udp_ioctl, .init = udp_init_sock, diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index f3877e8c6d70..5427379740af 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -108,7 +108,7 @@ void udp_v6_rehash(struct sock *sk) &sk->sk_v6_rcv_saddr, inet_sk(sk)->inet_num); - udp_lib_rehash(sk, new_hash); + udp_lib_rehash(sk, new_hash, 0); /* 4-tuple hash not implemented */ } static int compute_score(struct sock *sk, struct net *net, -- 2.34.1

From: Paolo Abeni <pabeni@redhat.com> mainline inclusion from mainline-v6.13-rc3 commit 51a00be6a0994da2ba6b4ace3b7a0d9373b4b25e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/ICIAC2 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------- After the blamed commit below, udp_rehash() is supposed to be called with both local and remote addresses set. Currently that is already the case for IPv6 sockets, but for IPv4 the destination address is updated after rehashing. Address the issue moving the destination address and port initialization before rehashing. Fixes: 1b29a730ef8b ("ipv6/udp: Add 4-tuple hash for connected socket") Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/4761e466ab9f7542c68cdc95f248987d127044d2.1733499715... Signed-off-by: Paolo Abeni <pabeni@redhat.com> Conflicts: net/ipv4/datagram.c [Context conflict.] Signed-off-by: Liu Jian <liujian56@huawei.com> --- net/ipv4/datagram.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/ipv4/datagram.c b/net/ipv4/datagram.c index 112c6e892d30..d1ad3154273a 100644 --- a/net/ipv4/datagram.c +++ b/net/ipv4/datagram.c @@ -61,15 +61,17 @@ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len err = -EACCES; goto out; } + + /* Update addresses before rehashing */ + inet->inet_daddr = fl4->daddr; + inet->inet_dport = usin->sin_port; if (!inet->inet_saddr) - inet->inet_saddr = fl4->saddr; /* Update source address */ + inet->inet_saddr = fl4->saddr; if (!inet->inet_rcv_saddr) { inet->inet_rcv_saddr = fl4->saddr; if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } - inet->inet_daddr = fl4->daddr; - inet->inet_dport = usin->sin_port; reuseport_has_conns_set(sk); sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); -- 2.34.1