diff options
| author | Cong Wang | 2021-03-30 19:32:32 -0700 |
|---|---|---|
| committer | Alexei Starovoitov | 2021-04-01 10:56:14 -0700 |
| commit | d7f571188ecf25c244789b883c878ec7c64b5b08 (patch) | |
| tree | f7180f3bdac5f80fbac0000a3927f05fb431013c | |
| parent | 8a59f9d1e3d4340659fdfee8879dc09a6f2546e1 (diff) | |
udp: Implement ->read_sock() for sockmap
This is similar to tcp_read_sock(), except we do not need
to worry about connections, we just need to retrieve skb
from UDP receive queue.
Note, the return value of ->read_sock() is unused in
sk_psock_verdict_data_ready(), and UDP still does not
support splice() due to lack of ->splice_read(), so users
can not reach udp_read_sock() directly.
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210331023237.41094-12-xiyou.wangcong@gmail.com
| -rw-r--r-- | include/net/udp.h | 2 | ||||
| -rw-r--r-- | net/ipv4/af_inet.c | 1 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 29 | ||||
| -rw-r--r-- | net/ipv6/af_inet6.c | 1 |
4 files changed, 33 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index df7cc1edc200..347b62a753c3 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -329,6 +329,8 @@ struct sock *__udp6_lib_lookup(struct net *net, struct sk_buff *skb); struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, __be16 sport, __be16 dport); +int udp_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor); /* UDP uses skb->dev_scratch to cache as much information as possible and avoid * possibly multiple cache miss on dequeue() diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 1355e6c0d567..f17870ee558b 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1070,6 +1070,7 @@ const struct proto_ops inet_dgram_ops = { .setsockopt = sock_common_setsockopt, .getsockopt = sock_common_getsockopt, .sendmsg = inet_sendmsg, + .read_sock = udp_read_sock, .recvmsg = inet_recvmsg, .mmap = sock_no_mmap, .sendpage = inet_sendpage, diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 38952aaee3a1..4d02f6839e38 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1782,6 +1782,35 @@ busy_check: } EXPORT_SYMBOL(__skb_recv_udp); +int udp_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor) +{ + int copied = 0; + + while (1) { + struct sk_buff *skb; + int err, used; + + skb = skb_recv_udp(sk, 0, 1, &err); + if (!skb) + return err; + used = recv_actor(desc, skb, 0, skb->len); + if (used <= 0) { + if (!copied) + copied = used; + break; + } else if (used <= skb->len) { + copied += used; + } + + if (!desc->count) + break; + } + + return copied; +} +EXPORT_SYMBOL(udp_read_sock); + /* * This should be easy, if there is something there we * return it, otherwise we block. diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 802f5111805a..71de739b4a9e 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -714,6 +714,7 @@ const struct proto_ops inet6_dgram_ops = { .getsockopt = sock_common_getsockopt, /* ok */ .sendmsg = inet6_sendmsg, /* retpoline's sake */ .recvmsg = inet6_recvmsg, /* retpoline's sake */ + .read_sock = udp_read_sock, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, .set_peek_off = sk_set_peek_off, |