mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
51e0158a54
Using sk_psock() to retrieve psock pointer from sock requires
RCU read lock, but we already get psock pointer before calling
->psock_update_sk_prot() in both cases, so we can just pass it
without bothering sk_psock().
Fixes: 8a59f9d1e3
("sock: Introduce sk->sk_prot->psock_update_sk_prot()")
Reported-by: syzbot+320a3bc8d80f478c37e4@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: syzbot+320a3bc8d80f478c37e4@syzkaller.appspotmail.com
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210407032111.33398-1-xiyou.wangcong@gmail.com
550 lines
16 KiB
C
550 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* Definitions for the UDP module.
|
|
*
|
|
* Version: @(#)udp.h 1.0.2 05/07/93
|
|
*
|
|
* Authors: Ross Biro
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
*
|
|
* Fixes:
|
|
* Alan Cox : Turned on udp checksums. I don't want to
|
|
* chase 'memory corruption' bugs that aren't!
|
|
*/
|
|
#ifndef _UDP_H
|
|
#define _UDP_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/bug.h>
|
|
#include <net/inet_sock.h>
|
|
#include <net/sock.h>
|
|
#include <net/snmp.h>
|
|
#include <net/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/indirect_call_wrapper.h>
|
|
|
|
/**
|
|
* struct udp_skb_cb - UDP(-Lite) private variables
|
|
*
|
|
* @header: private variables used by IPv4/IPv6
|
|
* @cscov: checksum coverage length (UDP-Lite only)
|
|
* @partial_cov: if set indicates partial csum coverage
|
|
*/
|
|
struct udp_skb_cb {
|
|
union {
|
|
struct inet_skb_parm h4;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct inet6_skb_parm h6;
|
|
#endif
|
|
} header;
|
|
__u16 cscov;
|
|
__u8 partial_cov;
|
|
};
|
|
#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
|
|
|
|
/**
|
|
* struct udp_hslot - UDP hash slot
|
|
*
|
|
* @head: head of list of sockets
|
|
* @count: number of sockets in 'head' list
|
|
* @lock: spinlock protecting changes to head/count
|
|
*/
|
|
struct udp_hslot {
|
|
struct hlist_head head;
|
|
int count;
|
|
spinlock_t lock;
|
|
} __attribute__((aligned(2 * sizeof(long))));
|
|
|
|
/**
|
|
* struct udp_table - UDP table
|
|
*
|
|
* @hash: hash table, sockets are hashed on (local port)
|
|
* @hash2: hash table, sockets are hashed on (local port, local address)
|
|
* @mask: number of slots in hash tables, minus 1
|
|
* @log: log2(number of slots in hash table)
|
|
*/
|
|
struct udp_table {
|
|
struct udp_hslot *hash;
|
|
struct udp_hslot *hash2;
|
|
unsigned int mask;
|
|
unsigned int log;
|
|
};
|
|
extern struct udp_table udp_table;
|
|
void udp_table_init(struct udp_table *, const char *);
|
|
static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
|
|
struct net *net, unsigned int num)
|
|
{
|
|
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()
|
|
*/
|
|
static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
|
|
unsigned int hash)
|
|
{
|
|
return &table->hash2[hash & table->mask];
|
|
}
|
|
|
|
extern struct proto udp_prot;
|
|
|
|
extern atomic_long_t udp_memory_allocated;
|
|
|
|
/* sysctl variables for udp */
|
|
extern long sysctl_udp_mem[3];
|
|
extern int sysctl_udp_rmem_min;
|
|
extern int sysctl_udp_wmem_min;
|
|
|
|
struct sk_buff;
|
|
|
|
/*
|
|
* Generic checksumming routines for UDP(-Lite) v4 and v6
|
|
*/
|
|
static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
|
|
{
|
|
return (UDP_SKB_CB(skb)->cscov == skb->len ?
|
|
__skb_checksum_complete(skb) :
|
|
__skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov));
|
|
}
|
|
|
|
static inline int udp_lib_checksum_complete(struct sk_buff *skb)
|
|
{
|
|
return !skb_csum_unnecessary(skb) &&
|
|
__udp_lib_checksum_complete(skb);
|
|
}
|
|
|
|
/**
|
|
* udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
|
|
* @sk: socket we are writing to
|
|
* @skb: sk_buff containing the filled-in UDP header
|
|
* (checksum field must be zeroed out)
|
|
*/
|
|
static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
__wsum csum = csum_partial(skb_transport_header(skb),
|
|
sizeof(struct udphdr), 0);
|
|
skb_queue_walk(&sk->sk_write_queue, skb) {
|
|
csum = csum_add(csum, skb->csum);
|
|
}
|
|
return csum;
|
|
}
|
|
|
|
static inline __wsum udp_csum(struct sk_buff *skb)
|
|
{
|
|
__wsum csum = csum_partial(skb_transport_header(skb),
|
|
sizeof(struct udphdr), skb->csum);
|
|
|
|
for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
|
|
csum = csum_add(csum, skb->csum);
|
|
}
|
|
return csum;
|
|
}
|
|
|
|
static inline __sum16 udp_v4_check(int len, __be32 saddr,
|
|
__be32 daddr, __wsum base)
|
|
{
|
|
return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
|
|
}
|
|
|
|
void udp_set_csum(bool nocheck, struct sk_buff *skb,
|
|
__be32 saddr, __be32 daddr, int len);
|
|
|
|
static inline void udp_csum_pull_header(struct sk_buff *skb)
|
|
{
|
|
if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE)
|
|
skb->csum = csum_partial(skb->data, sizeof(struct udphdr),
|
|
skb->csum);
|
|
skb_pull_rcsum(skb, sizeof(struct udphdr));
|
|
UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
|
|
}
|
|
|
|
typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport,
|
|
__be16 dport);
|
|
|
|
INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
|
|
struct sk_buff *));
|
|
INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
|
|
INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp6_gro_receive(struct list_head *,
|
|
struct sk_buff *));
|
|
INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int));
|
|
INDIRECT_CALLABLE_DECLARE(void udp_v6_early_demux(struct sk_buff *));
|
|
INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *));
|
|
|
|
struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
|
|
struct udphdr *uh, struct sock *sk);
|
|
int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
|
|
|
|
struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
|
|
netdev_features_t features, bool is_ipv6);
|
|
|
|
static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
|
|
{
|
|
struct udphdr *uh;
|
|
unsigned int hlen, off;
|
|
|
|
off = skb_gro_offset(skb);
|
|
hlen = off + sizeof(*uh);
|
|
uh = skb_gro_header_fast(skb, off);
|
|
if (skb_gro_header_hard(skb, hlen))
|
|
uh = skb_gro_header_slow(skb, hlen, off);
|
|
|
|
return uh;
|
|
}
|
|
|
|
/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
|
|
static inline int udp_lib_hash(struct sock *sk)
|
|
{
|
|
BUG();
|
|
return 0;
|
|
}
|
|
|
|
void udp_lib_unhash(struct sock *sk);
|
|
void udp_lib_rehash(struct sock *sk, u16 new_hash);
|
|
|
|
static inline void udp_lib_close(struct sock *sk, long timeout)
|
|
{
|
|
sk_common_release(sk);
|
|
}
|
|
|
|
int udp_lib_get_port(struct sock *sk, unsigned short snum,
|
|
unsigned int hash2_nulladdr);
|
|
|
|
u32 udp_flow_hashrnd(void);
|
|
|
|
static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
|
|
int min, int max, bool use_eth)
|
|
{
|
|
u32 hash;
|
|
|
|
if (min >= max) {
|
|
/* Use default range */
|
|
inet_get_local_port_range(net, &min, &max);
|
|
}
|
|
|
|
hash = skb_get_hash(skb);
|
|
if (unlikely(!hash)) {
|
|
if (use_eth) {
|
|
/* Can't find a normal hash, caller has indicated an
|
|
* Ethernet packet so use that to compute a hash.
|
|
*/
|
|
hash = jhash(skb->data, 2 * ETH_ALEN,
|
|
(__force u32) skb->protocol);
|
|
} else {
|
|
/* Can't derive any sort of hash for the packet, set
|
|
* to some consistent random value.
|
|
*/
|
|
hash = udp_flow_hashrnd();
|
|
}
|
|
}
|
|
|
|
/* Since this is being sent on the wire obfuscate hash a bit
|
|
* to minimize possbility that any useful information to an
|
|
* attacker is leaked. Only upper 16 bits are relevant in the
|
|
* computation for 16 bit port value.
|
|
*/
|
|
hash ^= hash << 16;
|
|
|
|
return htons((((u64) hash * (max - min)) >> 32) + min);
|
|
}
|
|
|
|
static inline int udp_rqueue_get(struct sock *sk)
|
|
{
|
|
return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit);
|
|
}
|
|
|
|
static inline bool udp_sk_bound_dev_eq(struct net *net, int bound_dev_if,
|
|
int dif, int sdif)
|
|
{
|
|
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
|
|
return inet_bound_dev_eq(!!net->ipv4.sysctl_udp_l3mdev_accept,
|
|
bound_dev_if, dif, sdif);
|
|
#else
|
|
return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
|
|
#endif
|
|
}
|
|
|
|
/* net/ipv4/udp.c */
|
|
void udp_destruct_sock(struct sock *sk);
|
|
void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len);
|
|
int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb);
|
|
void udp_skb_destructor(struct sock *sk, struct sk_buff *skb);
|
|
struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags,
|
|
int noblock, int *off, int *err);
|
|
static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags,
|
|
int noblock, int *err)
|
|
{
|
|
int off = 0;
|
|
|
|
return __skb_recv_udp(sk, flags, noblock, &off, err);
|
|
}
|
|
|
|
int udp_v4_early_demux(struct sk_buff *skb);
|
|
bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst);
|
|
int udp_get_port(struct sock *sk, unsigned short snum,
|
|
int (*saddr_cmp)(const struct sock *,
|
|
const struct sock *));
|
|
int udp_err(struct sk_buff *, u32);
|
|
int udp_abort(struct sock *sk, int err);
|
|
int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
|
|
int udp_push_pending_frames(struct sock *sk);
|
|
void udp_flush_pending_frames(struct sock *sk);
|
|
int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size);
|
|
void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
|
|
int udp_rcv(struct sk_buff *skb);
|
|
int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
|
|
int udp_init_sock(struct sock *sk);
|
|
int udp_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
|
|
int __udp_disconnect(struct sock *sk, int flags);
|
|
int udp_disconnect(struct sock *sk, int flags);
|
|
__poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait);
|
|
struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
|
|
netdev_features_t features,
|
|
bool is_ipv6);
|
|
int udp_lib_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen);
|
|
int udp_lib_setsockopt(struct sock *sk, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen,
|
|
int (*push_pending_frames)(struct sock *));
|
|
struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
|
|
__be32 daddr, __be16 dport, int dif);
|
|
struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
|
|
__be32 daddr, __be16 dport, int dif, int sdif,
|
|
struct udp_table *tbl, struct sk_buff *skb);
|
|
struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
|
|
__be16 sport, __be16 dport);
|
|
struct sock *udp6_lib_lookup(struct net *net,
|
|
const struct in6_addr *saddr, __be16 sport,
|
|
const struct in6_addr *daddr, __be16 dport,
|
|
int dif);
|
|
struct sock *__udp6_lib_lookup(struct net *net,
|
|
const struct in6_addr *saddr, __be16 sport,
|
|
const struct in6_addr *daddr, __be16 dport,
|
|
int dif, int sdif, struct udp_table *tbl,
|
|
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()
|
|
*/
|
|
struct udp_dev_scratch {
|
|
/* skb->truesize and the stateless bit are embedded in a single field;
|
|
* do not use a bitfield since the compiler emits better/smaller code
|
|
* this way
|
|
*/
|
|
u32 _tsize_state;
|
|
|
|
#if BITS_PER_LONG == 64
|
|
/* len and the bit needed to compute skb_csum_unnecessary
|
|
* will be on cold cache lines at recvmsg time.
|
|
* skb->len can be stored on 16 bits since the udp header has been
|
|
* already validated and pulled.
|
|
*/
|
|
u16 len;
|
|
bool is_linear;
|
|
bool csum_unnecessary;
|
|
#endif
|
|
};
|
|
|
|
static inline struct udp_dev_scratch *udp_skb_scratch(struct sk_buff *skb)
|
|
{
|
|
return (struct udp_dev_scratch *)&skb->dev_scratch;
|
|
}
|
|
|
|
#if BITS_PER_LONG == 64
|
|
static inline unsigned int udp_skb_len(struct sk_buff *skb)
|
|
{
|
|
return udp_skb_scratch(skb)->len;
|
|
}
|
|
|
|
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
|
|
{
|
|
return udp_skb_scratch(skb)->csum_unnecessary;
|
|
}
|
|
|
|
static inline bool udp_skb_is_linear(struct sk_buff *skb)
|
|
{
|
|
return udp_skb_scratch(skb)->is_linear;
|
|
}
|
|
|
|
#else
|
|
static inline unsigned int udp_skb_len(struct sk_buff *skb)
|
|
{
|
|
return skb->len;
|
|
}
|
|
|
|
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
|
|
{
|
|
return skb_csum_unnecessary(skb);
|
|
}
|
|
|
|
static inline bool udp_skb_is_linear(struct sk_buff *skb)
|
|
{
|
|
return !skb_is_nonlinear(skb);
|
|
}
|
|
#endif
|
|
|
|
static inline int copy_linear_skb(struct sk_buff *skb, int len, int off,
|
|
struct iov_iter *to)
|
|
{
|
|
int n;
|
|
|
|
n = copy_to_iter(skb->data + off, len, to);
|
|
if (n == len)
|
|
return 0;
|
|
|
|
iov_iter_revert(to, n);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/*
|
|
* SNMP statistics for UDP and UDP-Lite
|
|
*/
|
|
#define UDP_INC_STATS(net, field, is_udplite) do { \
|
|
if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
|
|
else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
|
|
#define __UDP_INC_STATS(net, field, is_udplite) do { \
|
|
if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
|
|
else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
|
|
|
|
#define __UDP6_INC_STATS(net, field, is_udplite) do { \
|
|
if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
|
|
else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
|
|
} while(0)
|
|
#define UDP6_INC_STATS(net, field, __lite) do { \
|
|
if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
|
|
else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
|
|
} while(0)
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
#define __UDPX_MIB(sk, ipv4) \
|
|
({ \
|
|
ipv4 ? (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \
|
|
sock_net(sk)->mib.udp_statistics) : \
|
|
(IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_stats_in6 : \
|
|
sock_net(sk)->mib.udp_stats_in6); \
|
|
})
|
|
#else
|
|
#define __UDPX_MIB(sk, ipv4) \
|
|
({ \
|
|
IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \
|
|
sock_net(sk)->mib.udp_statistics; \
|
|
})
|
|
#endif
|
|
|
|
#define __UDPX_INC_STATS(sk, field) \
|
|
__SNMP_INC_STATS(__UDPX_MIB(sk, (sk)->sk_family == AF_INET), field)
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
struct udp_seq_afinfo {
|
|
sa_family_t family;
|
|
struct udp_table *udp_table;
|
|
};
|
|
|
|
struct udp_iter_state {
|
|
struct seq_net_private p;
|
|
int bucket;
|
|
struct udp_seq_afinfo *bpf_seq_afinfo;
|
|
};
|
|
|
|
void *udp_seq_start(struct seq_file *seq, loff_t *pos);
|
|
void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos);
|
|
void udp_seq_stop(struct seq_file *seq, void *v);
|
|
|
|
extern const struct seq_operations udp_seq_ops;
|
|
extern const struct seq_operations udp6_seq_ops;
|
|
|
|
int udp4_proc_init(void);
|
|
void udp4_proc_exit(void);
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
int udpv4_offload_init(void);
|
|
|
|
void udp_init(void);
|
|
|
|
DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);
|
|
void udp_encap_enable(void);
|
|
void udp_encap_disable(void);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
|
|
void udpv6_encap_enable(void);
|
|
#endif
|
|
|
|
static inline struct sk_buff *udp_rcv_segment(struct sock *sk,
|
|
struct sk_buff *skb, bool ipv4)
|
|
{
|
|
netdev_features_t features = NETIF_F_SG;
|
|
struct sk_buff *segs;
|
|
|
|
/* Avoid csum recalculation by skb_segment unless userspace explicitly
|
|
* asks for the final checksum values
|
|
*/
|
|
if (!inet_get_convert_csum(sk))
|
|
features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
|
|
|
|
/* UDP segmentation expects packets of type CHECKSUM_PARTIAL or
|
|
* CHECKSUM_NONE in __udp_gso_segment. UDP GRO indeed builds partial
|
|
* packets in udp_gro_complete_segment. As does UDP GSO, verified by
|
|
* udp_send_skb. But when those packets are looped in dev_loopback_xmit
|
|
* their ip_summed is set to CHECKSUM_UNNECESSARY. Reset in this
|
|
* specific case, where PARTIAL is both correct and required.
|
|
*/
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
|
|
/* the GSO CB lays after the UDP one, no need to save and restore any
|
|
* CB fragment
|
|
*/
|
|
segs = __skb_gso_segment(skb, features, false);
|
|
if (IS_ERR_OR_NULL(segs)) {
|
|
int segs_nr = skb_shinfo(skb)->gso_segs;
|
|
|
|
atomic_add(segs_nr, &sk->sk_drops);
|
|
SNMP_ADD_STATS(__UDPX_MIB(sk, ipv4), UDP_MIB_INERRORS, segs_nr);
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
consume_skb(skb);
|
|
return segs;
|
|
}
|
|
|
|
static inline void udp_post_segment_fix_csum(struct sk_buff *skb)
|
|
{
|
|
/* UDP-lite can't land here - no GRO */
|
|
WARN_ON_ONCE(UDP_SKB_CB(skb)->partial_cov);
|
|
|
|
/* UDP packets generated with UDP_SEGMENT and traversing:
|
|
*
|
|
* UDP tunnel(xmit) -> veth (segmentation) -> veth (gro) -> UDP tunnel (rx)
|
|
*
|
|
* can reach an UDP socket with CHECKSUM_NONE, because
|
|
* __iptunnel_pull_header() converts CHECKSUM_PARTIAL into NONE.
|
|
* SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST packets with no UDP tunnel will
|
|
* have a valid checksum, as the GRO engine validates the UDP csum
|
|
* before the aggregation and nobody strips such info in between.
|
|
* Instead of adding another check in the tunnel fastpath, we can force
|
|
* a valid csum after the segmentation.
|
|
* Additionally fixup the UDP CB.
|
|
*/
|
|
UDP_SKB_CB(skb)->cscov = skb->len;
|
|
if (skb->ip_summed == CHECKSUM_NONE && !skb->csum_valid)
|
|
skb->csum_valid = 1;
|
|
}
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
struct sk_psock;
|
|
struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock);
|
|
int udp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
|
|
#endif
|
|
|
|
#endif /* _UDP_H */
|