mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1794 lines
41 KiB
1794 lines
41 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* 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. |
|
* |
|
* The IP to API glue. |
|
* |
|
* Authors: see ip.c |
|
* |
|
* Fixes: |
|
* Many : Split from ip.c , see ip.c for history. |
|
* Martin Mares : TOS setting fixed. |
|
* Alan Cox : Fixed a couple of oopses in Martin's |
|
* TOS tweaks. |
|
* Mike McLagan : Routing by source |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/types.h> |
|
#include <linux/mm.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/ip.h> |
|
#include <linux/icmp.h> |
|
#include <linux/inetdevice.h> |
|
#include <linux/netdevice.h> |
|
#include <linux/slab.h> |
|
#include <net/sock.h> |
|
#include <net/ip.h> |
|
#include <net/icmp.h> |
|
#include <net/tcp_states.h> |
|
#include <linux/udp.h> |
|
#include <linux/igmp.h> |
|
#include <linux/netfilter.h> |
|
#include <linux/route.h> |
|
#include <linux/mroute.h> |
|
#include <net/inet_ecn.h> |
|
#include <net/route.h> |
|
#include <net/xfrm.h> |
|
#include <net/compat.h> |
|
#include <net/checksum.h> |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
#include <net/transp_v6.h> |
|
#endif |
|
#include <net/ip_fib.h> |
|
|
|
#include <linux/errqueue.h> |
|
#include <linux/uaccess.h> |
|
|
|
#include <linux/bpfilter.h> |
|
|
|
/* |
|
* SOL_IP control messages. |
|
*/ |
|
|
|
static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
|
|
|
info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
|
|
|
put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
|
} |
|
|
|
static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
int ttl = ip_hdr(skb)->ttl; |
|
put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
|
} |
|
|
|
static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
|
} |
|
|
|
static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
if (IPCB(skb)->opt.optlen == 0) |
|
return; |
|
|
|
put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
|
ip_hdr(skb) + 1); |
|
} |
|
|
|
|
|
static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, |
|
struct sk_buff *skb) |
|
{ |
|
unsigned char optbuf[sizeof(struct ip_options) + 40]; |
|
struct ip_options *opt = (struct ip_options *)optbuf; |
|
|
|
if (IPCB(skb)->opt.optlen == 0) |
|
return; |
|
|
|
if (ip_options_echo(net, opt, skb)) { |
|
msg->msg_flags |= MSG_CTRUNC; |
|
return; |
|
} |
|
ip_options_undo(opt); |
|
|
|
put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); |
|
} |
|
|
|
static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
int val; |
|
|
|
if (IPCB(skb)->frag_max_size == 0) |
|
return; |
|
|
|
val = IPCB(skb)->frag_max_size; |
|
put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); |
|
} |
|
|
|
static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, |
|
int tlen, int offset) |
|
{ |
|
__wsum csum = skb->csum; |
|
|
|
if (skb->ip_summed != CHECKSUM_COMPLETE) |
|
return; |
|
|
|
if (offset != 0) { |
|
int tend_off = skb_transport_offset(skb) + tlen; |
|
csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); |
|
} |
|
|
|
put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); |
|
} |
|
|
|
static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
char *secdata; |
|
u32 seclen, secid; |
|
int err; |
|
|
|
err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
|
if (err) |
|
return; |
|
|
|
err = security_secid_to_secctx(secid, &secdata, &seclen); |
|
if (err) |
|
return; |
|
|
|
put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); |
|
security_release_secctx(secdata, seclen); |
|
} |
|
|
|
static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
|
{ |
|
__be16 _ports[2], *ports; |
|
struct sockaddr_in sin; |
|
|
|
/* All current transport protocols have the port numbers in the |
|
* first four bytes of the transport header and this function is |
|
* written with this assumption in mind. |
|
*/ |
|
ports = skb_header_pointer(skb, skb_transport_offset(skb), |
|
sizeof(_ports), &_ports); |
|
if (!ports) |
|
return; |
|
|
|
sin.sin_family = AF_INET; |
|
sin.sin_addr.s_addr = ip_hdr(skb)->daddr; |
|
sin.sin_port = ports[1]; |
|
memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
|
|
|
put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); |
|
} |
|
|
|
void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, |
|
struct sk_buff *skb, int tlen, int offset) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
unsigned int flags = inet->cmsg_flags; |
|
|
|
/* Ordered by supposed usage frequency */ |
|
if (flags & IP_CMSG_PKTINFO) { |
|
ip_cmsg_recv_pktinfo(msg, skb); |
|
|
|
flags &= ~IP_CMSG_PKTINFO; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_TTL) { |
|
ip_cmsg_recv_ttl(msg, skb); |
|
|
|
flags &= ~IP_CMSG_TTL; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_TOS) { |
|
ip_cmsg_recv_tos(msg, skb); |
|
|
|
flags &= ~IP_CMSG_TOS; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_RECVOPTS) { |
|
ip_cmsg_recv_opts(msg, skb); |
|
|
|
flags &= ~IP_CMSG_RECVOPTS; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_RETOPTS) { |
|
ip_cmsg_recv_retopts(sock_net(sk), msg, skb); |
|
|
|
flags &= ~IP_CMSG_RETOPTS; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_PASSSEC) { |
|
ip_cmsg_recv_security(msg, skb); |
|
|
|
flags &= ~IP_CMSG_PASSSEC; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_ORIGDSTADDR) { |
|
ip_cmsg_recv_dstaddr(msg, skb); |
|
|
|
flags &= ~IP_CMSG_ORIGDSTADDR; |
|
if (!flags) |
|
return; |
|
} |
|
|
|
if (flags & IP_CMSG_CHECKSUM) |
|
ip_cmsg_recv_checksum(msg, skb, tlen, offset); |
|
|
|
if (flags & IP_CMSG_RECVFRAGSIZE) |
|
ip_cmsg_recv_fragsize(msg, skb); |
|
} |
|
EXPORT_SYMBOL(ip_cmsg_recv_offset); |
|
|
|
int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, |
|
bool allow_ipv6) |
|
{ |
|
int err, val; |
|
struct cmsghdr *cmsg; |
|
struct net *net = sock_net(sk); |
|
|
|
for_each_cmsghdr(cmsg, msg) { |
|
if (!CMSG_OK(msg, cmsg)) |
|
return -EINVAL; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (allow_ipv6 && |
|
cmsg->cmsg_level == SOL_IPV6 && |
|
cmsg->cmsg_type == IPV6_PKTINFO) { |
|
struct in6_pktinfo *src_info; |
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) |
|
return -EINVAL; |
|
src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
|
if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) |
|
return -EINVAL; |
|
if (src_info->ipi6_ifindex) |
|
ipc->oif = src_info->ipi6_ifindex; |
|
ipc->addr = src_info->ipi6_addr.s6_addr32[3]; |
|
continue; |
|
} |
|
#endif |
|
if (cmsg->cmsg_level == SOL_SOCKET) { |
|
err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); |
|
if (err) |
|
return err; |
|
continue; |
|
} |
|
|
|
if (cmsg->cmsg_level != SOL_IP) |
|
continue; |
|
switch (cmsg->cmsg_type) { |
|
case IP_RETOPTS: |
|
err = cmsg->cmsg_len - sizeof(struct cmsghdr); |
|
|
|
/* Our caller is responsible for freeing ipc->opt */ |
|
err = ip_options_get(net, &ipc->opt, |
|
KERNEL_SOCKPTR(CMSG_DATA(cmsg)), |
|
err < 40 ? err : 40); |
|
if (err) |
|
return err; |
|
break; |
|
case IP_PKTINFO: |
|
{ |
|
struct in_pktinfo *info; |
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) |
|
return -EINVAL; |
|
info = (struct in_pktinfo *)CMSG_DATA(cmsg); |
|
if (info->ipi_ifindex) |
|
ipc->oif = info->ipi_ifindex; |
|
ipc->addr = info->ipi_spec_dst.s_addr; |
|
break; |
|
} |
|
case IP_TTL: |
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
|
return -EINVAL; |
|
val = *(int *)CMSG_DATA(cmsg); |
|
if (val < 1 || val > 255) |
|
return -EINVAL; |
|
ipc->ttl = val; |
|
break; |
|
case IP_TOS: |
|
if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) |
|
val = *(int *)CMSG_DATA(cmsg); |
|
else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) |
|
val = *(u8 *)CMSG_DATA(cmsg); |
|
else |
|
return -EINVAL; |
|
if (val < 0 || val > 255) |
|
return -EINVAL; |
|
ipc->tos = val; |
|
ipc->priority = rt_tos2priority(ipc->tos); |
|
break; |
|
|
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static void ip_ra_destroy_rcu(struct rcu_head *head) |
|
{ |
|
struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
|
|
|
sock_put(ra->saved_sk); |
|
kfree(ra); |
|
} |
|
|
|
int ip_ra_control(struct sock *sk, unsigned char on, |
|
void (*destructor)(struct sock *)) |
|
{ |
|
struct ip_ra_chain *ra, *new_ra; |
|
struct ip_ra_chain __rcu **rap; |
|
struct net *net = sock_net(sk); |
|
|
|
if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
|
return -EINVAL; |
|
|
|
new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; |
|
if (on && !new_ra) |
|
return -ENOMEM; |
|
|
|
mutex_lock(&net->ipv4.ra_mutex); |
|
for (rap = &net->ipv4.ra_chain; |
|
(ra = rcu_dereference_protected(*rap, |
|
lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; |
|
rap = &ra->next) { |
|
if (ra->sk == sk) { |
|
if (on) { |
|
mutex_unlock(&net->ipv4.ra_mutex); |
|
kfree(new_ra); |
|
return -EADDRINUSE; |
|
} |
|
/* dont let ip_call_ra_chain() use sk again */ |
|
ra->sk = NULL; |
|
RCU_INIT_POINTER(*rap, ra->next); |
|
mutex_unlock(&net->ipv4.ra_mutex); |
|
|
|
if (ra->destructor) |
|
ra->destructor(sk); |
|
/* |
|
* Delay sock_put(sk) and kfree(ra) after one rcu grace |
|
* period. This guarantee ip_call_ra_chain() dont need |
|
* to mess with socket refcounts. |
|
*/ |
|
ra->saved_sk = sk; |
|
call_rcu(&ra->rcu, ip_ra_destroy_rcu); |
|
return 0; |
|
} |
|
} |
|
if (!new_ra) { |
|
mutex_unlock(&net->ipv4.ra_mutex); |
|
return -ENOBUFS; |
|
} |
|
new_ra->sk = sk; |
|
new_ra->destructor = destructor; |
|
|
|
RCU_INIT_POINTER(new_ra->next, ra); |
|
rcu_assign_pointer(*rap, new_ra); |
|
sock_hold(sk); |
|
mutex_unlock(&net->ipv4.ra_mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb, |
|
struct sock_ee_data_rfc4884 *out) |
|
{ |
|
switch (icmp_hdr(skb)->type) { |
|
case ICMP_DEST_UNREACH: |
|
case ICMP_TIME_EXCEEDED: |
|
case ICMP_PARAMETERPROB: |
|
ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr), |
|
icmp_hdr(skb)->un.reserved[1] * 4); |
|
} |
|
} |
|
|
|
void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
|
__be16 port, u32 info, u8 *payload) |
|
{ |
|
struct sock_exterr_skb *serr; |
|
|
|
skb = skb_clone(skb, GFP_ATOMIC); |
|
if (!skb) |
|
return; |
|
|
|
serr = SKB_EXT_ERR(skb); |
|
serr->ee.ee_errno = err; |
|
serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; |
|
serr->ee.ee_type = icmp_hdr(skb)->type; |
|
serr->ee.ee_code = icmp_hdr(skb)->code; |
|
serr->ee.ee_pad = 0; |
|
serr->ee.ee_info = info; |
|
serr->ee.ee_data = 0; |
|
serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
|
skb_network_header(skb); |
|
serr->port = port; |
|
|
|
if (skb_pull(skb, payload - skb->data)) { |
|
if (inet_sk(sk)->recverr_rfc4884) |
|
ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); |
|
|
|
skb_reset_transport_header(skb); |
|
if (sock_queue_err_skb(sk, skb) == 0) |
|
return; |
|
} |
|
kfree_skb(skb); |
|
} |
|
|
|
void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct sock_exterr_skb *serr; |
|
struct iphdr *iph; |
|
struct sk_buff *skb; |
|
|
|
if (!inet->recverr) |
|
return; |
|
|
|
skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); |
|
if (!skb) |
|
return; |
|
|
|
skb_put(skb, sizeof(struct iphdr)); |
|
skb_reset_network_header(skb); |
|
iph = ip_hdr(skb); |
|
iph->daddr = daddr; |
|
|
|
serr = SKB_EXT_ERR(skb); |
|
serr->ee.ee_errno = err; |
|
serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
|
serr->ee.ee_type = 0; |
|
serr->ee.ee_code = 0; |
|
serr->ee.ee_pad = 0; |
|
serr->ee.ee_info = info; |
|
serr->ee.ee_data = 0; |
|
serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
|
serr->port = port; |
|
|
|
__skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
|
skb_reset_transport_header(skb); |
|
|
|
if (sock_queue_err_skb(sk, skb)) |
|
kfree_skb(skb); |
|
} |
|
|
|
/* For some errors we have valid addr_offset even with zero payload and |
|
* zero port. Also, addr_offset should be supported if port is set. |
|
*/ |
|
static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) |
|
{ |
|
return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
|
serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; |
|
} |
|
|
|
/* IPv4 supports cmsg on all imcp errors and some timestamps |
|
* |
|
* Timestamp code paths do not initialize the fields expected by cmsg: |
|
* the PKTINFO fields in skb->cb[]. Fill those in here. |
|
*/ |
|
static bool ipv4_datagram_support_cmsg(const struct sock *sk, |
|
struct sk_buff *skb, |
|
int ee_origin) |
|
{ |
|
struct in_pktinfo *info; |
|
|
|
if (ee_origin == SO_EE_ORIGIN_ICMP) |
|
return true; |
|
|
|
if (ee_origin == SO_EE_ORIGIN_LOCAL) |
|
return false; |
|
|
|
/* Support IP_PKTINFO on tstamp packets if requested, to correlate |
|
* timestamp with egress dev. Not possible for packets without iif |
|
* or without payload (SOF_TIMESTAMPING_OPT_TSONLY). |
|
*/ |
|
info = PKTINFO_SKB_CB(skb); |
|
if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || |
|
!info->ipi_ifindex) |
|
return false; |
|
|
|
info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; |
|
return true; |
|
} |
|
|
|
/* |
|
* Handle MSG_ERRQUEUE |
|
*/ |
|
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
|
{ |
|
struct sock_exterr_skb *serr; |
|
struct sk_buff *skb; |
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
|
struct { |
|
struct sock_extended_err ee; |
|
struct sockaddr_in offender; |
|
} errhdr; |
|
int err; |
|
int copied; |
|
|
|
err = -EAGAIN; |
|
skb = sock_dequeue_err_skb(sk); |
|
if (!skb) |
|
goto out; |
|
|
|
copied = skb->len; |
|
if (copied > len) { |
|
msg->msg_flags |= MSG_TRUNC; |
|
copied = len; |
|
} |
|
err = skb_copy_datagram_msg(skb, 0, msg, copied); |
|
if (unlikely(err)) { |
|
kfree_skb(skb); |
|
return err; |
|
} |
|
sock_recv_timestamp(msg, sk, skb); |
|
|
|
serr = SKB_EXT_ERR(skb); |
|
|
|
if (sin && ipv4_datagram_support_addr(serr)) { |
|
sin->sin_family = AF_INET; |
|
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
|
serr->addr_offset); |
|
sin->sin_port = serr->port; |
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
|
*addr_len = sizeof(*sin); |
|
} |
|
|
|
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
|
sin = &errhdr.offender; |
|
memset(sin, 0, sizeof(*sin)); |
|
|
|
if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { |
|
sin->sin_family = AF_INET; |
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
|
if (inet_sk(sk)->cmsg_flags) |
|
ip_cmsg_recv(msg, skb); |
|
} |
|
|
|
put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); |
|
|
|
/* Now we could try to dump offended packet options */ |
|
|
|
msg->msg_flags |= MSG_ERRQUEUE; |
|
err = copied; |
|
|
|
consume_skb(skb); |
|
out: |
|
return err; |
|
} |
|
|
|
void __ip_sock_set_tos(struct sock *sk, int val) |
|
{ |
|
if (sk->sk_type == SOCK_STREAM) { |
|
val &= ~INET_ECN_MASK; |
|
val |= inet_sk(sk)->tos & INET_ECN_MASK; |
|
} |
|
if (inet_sk(sk)->tos != val) { |
|
inet_sk(sk)->tos = val; |
|
sk->sk_priority = rt_tos2priority(val); |
|
sk_dst_reset(sk); |
|
} |
|
} |
|
|
|
void ip_sock_set_tos(struct sock *sk, int val) |
|
{ |
|
lock_sock(sk); |
|
__ip_sock_set_tos(sk, val); |
|
release_sock(sk); |
|
} |
|
EXPORT_SYMBOL(ip_sock_set_tos); |
|
|
|
void ip_sock_set_freebind(struct sock *sk) |
|
{ |
|
lock_sock(sk); |
|
inet_sk(sk)->freebind = true; |
|
release_sock(sk); |
|
} |
|
EXPORT_SYMBOL(ip_sock_set_freebind); |
|
|
|
void ip_sock_set_recverr(struct sock *sk) |
|
{ |
|
lock_sock(sk); |
|
inet_sk(sk)->recverr = true; |
|
release_sock(sk); |
|
} |
|
EXPORT_SYMBOL(ip_sock_set_recverr); |
|
|
|
int ip_sock_set_mtu_discover(struct sock *sk, int val) |
|
{ |
|
if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
|
return -EINVAL; |
|
lock_sock(sk); |
|
inet_sk(sk)->pmtudisc = val; |
|
release_sock(sk); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ip_sock_set_mtu_discover); |
|
|
|
void ip_sock_set_pktinfo(struct sock *sk) |
|
{ |
|
lock_sock(sk); |
|
inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO; |
|
release_sock(sk); |
|
} |
|
EXPORT_SYMBOL(ip_sock_set_pktinfo); |
|
|
|
/* |
|
* Socket option code for IP. This is the end of the line after any |
|
* TCP,UDP etc options on an IP socket. |
|
*/ |
|
static bool setsockopt_needs_rtnl(int optname) |
|
{ |
|
switch (optname) { |
|
case IP_ADD_MEMBERSHIP: |
|
case IP_ADD_SOURCE_MEMBERSHIP: |
|
case IP_BLOCK_SOURCE: |
|
case IP_DROP_MEMBERSHIP: |
|
case IP_DROP_SOURCE_MEMBERSHIP: |
|
case IP_MSFILTER: |
|
case IP_UNBLOCK_SOURCE: |
|
case MCAST_BLOCK_SOURCE: |
|
case MCAST_MSFILTER: |
|
case MCAST_JOIN_GROUP: |
|
case MCAST_JOIN_SOURCE_GROUP: |
|
case MCAST_LEAVE_GROUP: |
|
case MCAST_LEAVE_SOURCE_GROUP: |
|
case MCAST_UNBLOCK_SOURCE: |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static int set_mcast_msfilter(struct sock *sk, int ifindex, |
|
int numsrc, int fmode, |
|
struct sockaddr_storage *group, |
|
struct sockaddr_storage *list) |
|
{ |
|
struct ip_msfilter *msf; |
|
struct sockaddr_in *psin; |
|
int err, i; |
|
|
|
msf = kmalloc(IP_MSFILTER_SIZE(numsrc), GFP_KERNEL); |
|
if (!msf) |
|
return -ENOBUFS; |
|
|
|
psin = (struct sockaddr_in *)group; |
|
if (psin->sin_family != AF_INET) |
|
goto Eaddrnotavail; |
|
msf->imsf_multiaddr = psin->sin_addr.s_addr; |
|
msf->imsf_interface = 0; |
|
msf->imsf_fmode = fmode; |
|
msf->imsf_numsrc = numsrc; |
|
for (i = 0; i < numsrc; ++i) { |
|
psin = (struct sockaddr_in *)&list[i]; |
|
|
|
if (psin->sin_family != AF_INET) |
|
goto Eaddrnotavail; |
|
msf->imsf_slist_flex[i] = psin->sin_addr.s_addr; |
|
} |
|
err = ip_mc_msfilter(sk, msf, ifindex); |
|
kfree(msf); |
|
return err; |
|
|
|
Eaddrnotavail: |
|
kfree(msf); |
|
return -EADDRNOTAVAIL; |
|
} |
|
|
|
static int copy_group_source_from_sockptr(struct group_source_req *greqs, |
|
sockptr_t optval, int optlen) |
|
{ |
|
if (in_compat_syscall()) { |
|
struct compat_group_source_req gr32; |
|
|
|
if (optlen != sizeof(gr32)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) |
|
return -EFAULT; |
|
greqs->gsr_interface = gr32.gsr_interface; |
|
greqs->gsr_group = gr32.gsr_group; |
|
greqs->gsr_source = gr32.gsr_source; |
|
} else { |
|
if (optlen != sizeof(*greqs)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) |
|
return -EFAULT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int do_mcast_group_source(struct sock *sk, int optname, |
|
sockptr_t optval, int optlen) |
|
{ |
|
struct group_source_req greqs; |
|
struct ip_mreq_source mreqs; |
|
struct sockaddr_in *psin; |
|
int omode, add, err; |
|
|
|
err = copy_group_source_from_sockptr(&greqs, optval, optlen); |
|
if (err) |
|
return err; |
|
|
|
if (greqs.gsr_group.ss_family != AF_INET || |
|
greqs.gsr_source.ss_family != AF_INET) |
|
return -EADDRNOTAVAIL; |
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group; |
|
mreqs.imr_multiaddr = psin->sin_addr.s_addr; |
|
psin = (struct sockaddr_in *)&greqs.gsr_source; |
|
mreqs.imr_sourceaddr = psin->sin_addr.s_addr; |
|
mreqs.imr_interface = 0; /* use index for mc_source */ |
|
|
|
if (optname == MCAST_BLOCK_SOURCE) { |
|
omode = MCAST_EXCLUDE; |
|
add = 1; |
|
} else if (optname == MCAST_UNBLOCK_SOURCE) { |
|
omode = MCAST_EXCLUDE; |
|
add = 0; |
|
} else if (optname == MCAST_JOIN_SOURCE_GROUP) { |
|
struct ip_mreqn mreq; |
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group; |
|
mreq.imr_multiaddr = psin->sin_addr; |
|
mreq.imr_address.s_addr = 0; |
|
mreq.imr_ifindex = greqs.gsr_interface; |
|
err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
|
if (err && err != -EADDRINUSE) |
|
return err; |
|
greqs.gsr_interface = mreq.imr_ifindex; |
|
omode = MCAST_INCLUDE; |
|
add = 1; |
|
} else /* MCAST_LEAVE_SOURCE_GROUP */ { |
|
omode = MCAST_INCLUDE; |
|
add = 0; |
|
} |
|
return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface); |
|
} |
|
|
|
static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen) |
|
{ |
|
struct group_filter *gsf = NULL; |
|
int err; |
|
|
|
if (optlen < GROUP_FILTER_SIZE(0)) |
|
return -EINVAL; |
|
if (optlen > sysctl_optmem_max) |
|
return -ENOBUFS; |
|
|
|
gsf = memdup_sockptr(optval, optlen); |
|
if (IS_ERR(gsf)) |
|
return PTR_ERR(gsf); |
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */ |
|
err = -ENOBUFS; |
|
if (gsf->gf_numsrc >= 0x1ffffff || |
|
gsf->gf_numsrc > sock_net(sk)->ipv4.sysctl_igmp_max_msf) |
|
goto out_free_gsf; |
|
|
|
err = -EINVAL; |
|
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) |
|
goto out_free_gsf; |
|
|
|
err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc, |
|
gsf->gf_fmode, &gsf->gf_group, |
|
gsf->gf_slist_flex); |
|
out_free_gsf: |
|
kfree(gsf); |
|
return err; |
|
} |
|
|
|
static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, |
|
int optlen) |
|
{ |
|
const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); |
|
struct compat_group_filter *gf32; |
|
unsigned int n; |
|
void *p; |
|
int err; |
|
|
|
if (optlen < size0) |
|
return -EINVAL; |
|
if (optlen > sysctl_optmem_max - 4) |
|
return -ENOBUFS; |
|
|
|
p = kmalloc(optlen + 4, GFP_KERNEL); |
|
if (!p) |
|
return -ENOMEM; |
|
gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */ |
|
|
|
err = -EFAULT; |
|
if (copy_from_sockptr(gf32, optval, optlen)) |
|
goto out_free_gsf; |
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */ |
|
n = gf32->gf_numsrc; |
|
err = -ENOBUFS; |
|
if (n >= 0x1ffffff) |
|
goto out_free_gsf; |
|
|
|
err = -EINVAL; |
|
if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen) |
|
goto out_free_gsf; |
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */ |
|
err = -ENOBUFS; |
|
if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf) |
|
goto out_free_gsf; |
|
err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode, |
|
&gf32->gf_group, gf32->gf_slist_flex); |
|
out_free_gsf: |
|
kfree(p); |
|
return err; |
|
} |
|
|
|
static int ip_mcast_join_leave(struct sock *sk, int optname, |
|
sockptr_t optval, int optlen) |
|
{ |
|
struct ip_mreqn mreq = { }; |
|
struct sockaddr_in *psin; |
|
struct group_req greq; |
|
|
|
if (optlen < sizeof(struct group_req)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&greq, optval, sizeof(greq))) |
|
return -EFAULT; |
|
|
|
psin = (struct sockaddr_in *)&greq.gr_group; |
|
if (psin->sin_family != AF_INET) |
|
return -EINVAL; |
|
mreq.imr_multiaddr = psin->sin_addr; |
|
mreq.imr_ifindex = greq.gr_interface; |
|
if (optname == MCAST_JOIN_GROUP) |
|
return ip_mc_join_group(sk, &mreq); |
|
return ip_mc_leave_group(sk, &mreq); |
|
} |
|
|
|
static int compat_ip_mcast_join_leave(struct sock *sk, int optname, |
|
sockptr_t optval, int optlen) |
|
{ |
|
struct compat_group_req greq; |
|
struct ip_mreqn mreq = { }; |
|
struct sockaddr_in *psin; |
|
|
|
if (optlen < sizeof(struct compat_group_req)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&greq, optval, sizeof(greq))) |
|
return -EFAULT; |
|
|
|
psin = (struct sockaddr_in *)&greq.gr_group; |
|
if (psin->sin_family != AF_INET) |
|
return -EINVAL; |
|
mreq.imr_multiaddr = psin->sin_addr; |
|
mreq.imr_ifindex = greq.gr_interface; |
|
|
|
if (optname == MCAST_JOIN_GROUP) |
|
return ip_mc_join_group(sk, &mreq); |
|
return ip_mc_leave_group(sk, &mreq); |
|
} |
|
|
|
DEFINE_STATIC_KEY_FALSE(ip4_min_ttl); |
|
|
|
static int do_ip_setsockopt(struct sock *sk, int level, int optname, |
|
sockptr_t optval, unsigned int optlen) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct net *net = sock_net(sk); |
|
int val = 0, err; |
|
bool needs_rtnl = setsockopt_needs_rtnl(optname); |
|
|
|
switch (optname) { |
|
case IP_PKTINFO: |
|
case IP_RECVTTL: |
|
case IP_RECVOPTS: |
|
case IP_RECVTOS: |
|
case IP_RETOPTS: |
|
case IP_TOS: |
|
case IP_TTL: |
|
case IP_HDRINCL: |
|
case IP_MTU_DISCOVER: |
|
case IP_RECVERR: |
|
case IP_ROUTER_ALERT: |
|
case IP_FREEBIND: |
|
case IP_PASSSEC: |
|
case IP_TRANSPARENT: |
|
case IP_MINTTL: |
|
case IP_NODEFRAG: |
|
case IP_BIND_ADDRESS_NO_PORT: |
|
case IP_UNICAST_IF: |
|
case IP_MULTICAST_TTL: |
|
case IP_MULTICAST_ALL: |
|
case IP_MULTICAST_LOOP: |
|
case IP_RECVORIGDSTADDR: |
|
case IP_CHECKSUM: |
|
case IP_RECVFRAGSIZE: |
|
case IP_RECVERR_RFC4884: |
|
if (optlen >= sizeof(int)) { |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
} else if (optlen >= sizeof(char)) { |
|
unsigned char ucval; |
|
|
|
if (copy_from_sockptr(&ucval, optval, sizeof(ucval))) |
|
return -EFAULT; |
|
val = (int) ucval; |
|
} |
|
} |
|
|
|
/* If optlen==0, it is equivalent to val == 0 */ |
|
|
|
if (optname == IP_ROUTER_ALERT) |
|
return ip_ra_control(sk, val ? 1 : 0, NULL); |
|
if (ip_mroute_opt(optname)) |
|
return ip_mroute_setsockopt(sk, optname, optval, optlen); |
|
|
|
err = 0; |
|
if (needs_rtnl) |
|
rtnl_lock(); |
|
lock_sock(sk); |
|
|
|
switch (optname) { |
|
case IP_OPTIONS: |
|
{ |
|
struct ip_options_rcu *old, *opt = NULL; |
|
|
|
if (optlen > 40) |
|
goto e_inval; |
|
err = ip_options_get(sock_net(sk), &opt, optval, optlen); |
|
if (err) |
|
break; |
|
old = rcu_dereference_protected(inet->inet_opt, |
|
lockdep_sock_is_held(sk)); |
|
if (inet->is_icsk) { |
|
struct inet_connection_sock *icsk = inet_csk(sk); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (sk->sk_family == PF_INET || |
|
(!((1 << sk->sk_state) & |
|
(TCPF_LISTEN | TCPF_CLOSE)) && |
|
inet->inet_daddr != LOOPBACK4_IPV6)) { |
|
#endif |
|
if (old) |
|
icsk->icsk_ext_hdr_len -= old->opt.optlen; |
|
if (opt) |
|
icsk->icsk_ext_hdr_len += opt->opt.optlen; |
|
icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} |
|
#endif |
|
} |
|
rcu_assign_pointer(inet->inet_opt, opt); |
|
if (old) |
|
kfree_rcu(old, rcu); |
|
break; |
|
} |
|
case IP_PKTINFO: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_PKTINFO; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_PKTINFO; |
|
break; |
|
case IP_RECVTTL: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_TTL; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_TTL; |
|
break; |
|
case IP_RECVTOS: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_TOS; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_TOS; |
|
break; |
|
case IP_RECVOPTS: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_RECVOPTS; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; |
|
break; |
|
case IP_RETOPTS: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_RETOPTS; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_RETOPTS; |
|
break; |
|
case IP_PASSSEC: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_PASSSEC; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_PASSSEC; |
|
break; |
|
case IP_RECVORIGDSTADDR: |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; |
|
break; |
|
case IP_CHECKSUM: |
|
if (val) { |
|
if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { |
|
inet_inc_convert_csum(sk); |
|
inet->cmsg_flags |= IP_CMSG_CHECKSUM; |
|
} |
|
} else { |
|
if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { |
|
inet_dec_convert_csum(sk); |
|
inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; |
|
} |
|
} |
|
break; |
|
case IP_RECVFRAGSIZE: |
|
if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) |
|
goto e_inval; |
|
if (val) |
|
inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; |
|
else |
|
inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; |
|
break; |
|
case IP_TOS: /* This sets both TOS and Precedence */ |
|
__ip_sock_set_tos(sk, val); |
|
break; |
|
case IP_TTL: |
|
if (optlen < 1) |
|
goto e_inval; |
|
if (val != -1 && (val < 1 || val > 255)) |
|
goto e_inval; |
|
inet->uc_ttl = val; |
|
break; |
|
case IP_HDRINCL: |
|
if (sk->sk_type != SOCK_RAW) { |
|
err = -ENOPROTOOPT; |
|
break; |
|
} |
|
inet->hdrincl = val ? 1 : 0; |
|
break; |
|
case IP_NODEFRAG: |
|
if (sk->sk_type != SOCK_RAW) { |
|
err = -ENOPROTOOPT; |
|
break; |
|
} |
|
inet->nodefrag = val ? 1 : 0; |
|
break; |
|
case IP_BIND_ADDRESS_NO_PORT: |
|
inet->bind_address_no_port = val ? 1 : 0; |
|
break; |
|
case IP_MTU_DISCOVER: |
|
if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) |
|
goto e_inval; |
|
inet->pmtudisc = val; |
|
break; |
|
case IP_RECVERR: |
|
inet->recverr = !!val; |
|
if (!val) |
|
skb_queue_purge(&sk->sk_error_queue); |
|
break; |
|
case IP_RECVERR_RFC4884: |
|
if (val < 0 || val > 1) |
|
goto e_inval; |
|
inet->recverr_rfc4884 = !!val; |
|
break; |
|
case IP_MULTICAST_TTL: |
|
if (sk->sk_type == SOCK_STREAM) |
|
goto e_inval; |
|
if (optlen < 1) |
|
goto e_inval; |
|
if (val == -1) |
|
val = 1; |
|
if (val < 0 || val > 255) |
|
goto e_inval; |
|
inet->mc_ttl = val; |
|
break; |
|
case IP_MULTICAST_LOOP: |
|
if (optlen < 1) |
|
goto e_inval; |
|
inet->mc_loop = !!val; |
|
break; |
|
case IP_UNICAST_IF: |
|
{ |
|
struct net_device *dev = NULL; |
|
int ifindex; |
|
int midx; |
|
|
|
if (optlen != sizeof(int)) |
|
goto e_inval; |
|
|
|
ifindex = (__force int)ntohl((__force __be32)val); |
|
if (ifindex == 0) { |
|
inet->uc_index = 0; |
|
err = 0; |
|
break; |
|
} |
|
|
|
dev = dev_get_by_index(sock_net(sk), ifindex); |
|
err = -EADDRNOTAVAIL; |
|
if (!dev) |
|
break; |
|
|
|
midx = l3mdev_master_ifindex(dev); |
|
dev_put(dev); |
|
|
|
err = -EINVAL; |
|
if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if) |
|
break; |
|
|
|
inet->uc_index = ifindex; |
|
err = 0; |
|
break; |
|
} |
|
case IP_MULTICAST_IF: |
|
{ |
|
struct ip_mreqn mreq; |
|
struct net_device *dev = NULL; |
|
int midx; |
|
|
|
if (sk->sk_type == SOCK_STREAM) |
|
goto e_inval; |
|
/* |
|
* Check the arguments are allowable |
|
*/ |
|
|
|
if (optlen < sizeof(struct in_addr)) |
|
goto e_inval; |
|
|
|
err = -EFAULT; |
|
if (optlen >= sizeof(struct ip_mreqn)) { |
|
if (copy_from_sockptr(&mreq, optval, sizeof(mreq))) |
|
break; |
|
} else { |
|
memset(&mreq, 0, sizeof(mreq)); |
|
if (optlen >= sizeof(struct ip_mreq)) { |
|
if (copy_from_sockptr(&mreq, optval, |
|
sizeof(struct ip_mreq))) |
|
break; |
|
} else if (optlen >= sizeof(struct in_addr)) { |
|
if (copy_from_sockptr(&mreq.imr_address, optval, |
|
sizeof(struct in_addr))) |
|
break; |
|
} |
|
} |
|
|
|
if (!mreq.imr_ifindex) { |
|
if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
|
inet->mc_index = 0; |
|
inet->mc_addr = 0; |
|
err = 0; |
|
break; |
|
} |
|
dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
|
if (dev) |
|
mreq.imr_ifindex = dev->ifindex; |
|
} else |
|
dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
|
|
|
|
|
err = -EADDRNOTAVAIL; |
|
if (!dev) |
|
break; |
|
|
|
midx = l3mdev_master_ifindex(dev); |
|
|
|
dev_put(dev); |
|
|
|
err = -EINVAL; |
|
if (sk->sk_bound_dev_if && |
|
mreq.imr_ifindex != sk->sk_bound_dev_if && |
|
midx != sk->sk_bound_dev_if) |
|
break; |
|
|
|
inet->mc_index = mreq.imr_ifindex; |
|
inet->mc_addr = mreq.imr_address.s_addr; |
|
err = 0; |
|
break; |
|
} |
|
|
|
case IP_ADD_MEMBERSHIP: |
|
case IP_DROP_MEMBERSHIP: |
|
{ |
|
struct ip_mreqn mreq; |
|
|
|
err = -EPROTO; |
|
if (inet_sk(sk)->is_icsk) |
|
break; |
|
|
|
if (optlen < sizeof(struct ip_mreq)) |
|
goto e_inval; |
|
err = -EFAULT; |
|
if (optlen >= sizeof(struct ip_mreqn)) { |
|
if (copy_from_sockptr(&mreq, optval, sizeof(mreq))) |
|
break; |
|
} else { |
|
memset(&mreq, 0, sizeof(mreq)); |
|
if (copy_from_sockptr(&mreq, optval, |
|
sizeof(struct ip_mreq))) |
|
break; |
|
} |
|
|
|
if (optname == IP_ADD_MEMBERSHIP) |
|
err = ip_mc_join_group(sk, &mreq); |
|
else |
|
err = ip_mc_leave_group(sk, &mreq); |
|
break; |
|
} |
|
case IP_MSFILTER: |
|
{ |
|
struct ip_msfilter *msf; |
|
|
|
if (optlen < IP_MSFILTER_SIZE(0)) |
|
goto e_inval; |
|
if (optlen > sysctl_optmem_max) { |
|
err = -ENOBUFS; |
|
break; |
|
} |
|
msf = memdup_sockptr(optval, optlen); |
|
if (IS_ERR(msf)) { |
|
err = PTR_ERR(msf); |
|
break; |
|
} |
|
/* numsrc >= (1G-4) overflow in 32 bits */ |
|
if (msf->imsf_numsrc >= 0x3ffffffcU || |
|
msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { |
|
kfree(msf); |
|
err = -ENOBUFS; |
|
break; |
|
} |
|
if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { |
|
kfree(msf); |
|
err = -EINVAL; |
|
break; |
|
} |
|
err = ip_mc_msfilter(sk, msf, 0); |
|
kfree(msf); |
|
break; |
|
} |
|
case IP_BLOCK_SOURCE: |
|
case IP_UNBLOCK_SOURCE: |
|
case IP_ADD_SOURCE_MEMBERSHIP: |
|
case IP_DROP_SOURCE_MEMBERSHIP: |
|
{ |
|
struct ip_mreq_source mreqs; |
|
int omode, add; |
|
|
|
if (optlen != sizeof(struct ip_mreq_source)) |
|
goto e_inval; |
|
if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
if (optname == IP_BLOCK_SOURCE) { |
|
omode = MCAST_EXCLUDE; |
|
add = 1; |
|
} else if (optname == IP_UNBLOCK_SOURCE) { |
|
omode = MCAST_EXCLUDE; |
|
add = 0; |
|
} else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { |
|
struct ip_mreqn mreq; |
|
|
|
mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
|
mreq.imr_address.s_addr = mreqs.imr_interface; |
|
mreq.imr_ifindex = 0; |
|
err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); |
|
if (err && err != -EADDRINUSE) |
|
break; |
|
omode = MCAST_INCLUDE; |
|
add = 1; |
|
} else /* IP_DROP_SOURCE_MEMBERSHIP */ { |
|
omode = MCAST_INCLUDE; |
|
add = 0; |
|
} |
|
err = ip_mc_source(add, omode, sk, &mreqs, 0); |
|
break; |
|
} |
|
case MCAST_JOIN_GROUP: |
|
case MCAST_LEAVE_GROUP: |
|
if (in_compat_syscall()) |
|
err = compat_ip_mcast_join_leave(sk, optname, optval, |
|
optlen); |
|
else |
|
err = ip_mcast_join_leave(sk, optname, optval, optlen); |
|
break; |
|
case MCAST_JOIN_SOURCE_GROUP: |
|
case MCAST_LEAVE_SOURCE_GROUP: |
|
case MCAST_BLOCK_SOURCE: |
|
case MCAST_UNBLOCK_SOURCE: |
|
err = do_mcast_group_source(sk, optname, optval, optlen); |
|
break; |
|
case MCAST_MSFILTER: |
|
if (in_compat_syscall()) |
|
err = compat_ip_set_mcast_msfilter(sk, optval, optlen); |
|
else |
|
err = ip_set_mcast_msfilter(sk, optval, optlen); |
|
break; |
|
case IP_MULTICAST_ALL: |
|
if (optlen < 1) |
|
goto e_inval; |
|
if (val != 0 && val != 1) |
|
goto e_inval; |
|
inet->mc_all = val; |
|
break; |
|
|
|
case IP_FREEBIND: |
|
if (optlen < 1) |
|
goto e_inval; |
|
inet->freebind = !!val; |
|
break; |
|
|
|
case IP_IPSEC_POLICY: |
|
case IP_XFRM_POLICY: |
|
err = -EPERM; |
|
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
|
break; |
|
err = xfrm_user_policy(sk, optname, optval, optlen); |
|
break; |
|
|
|
case IP_TRANSPARENT: |
|
if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && |
|
!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { |
|
err = -EPERM; |
|
break; |
|
} |
|
if (optlen < 1) |
|
goto e_inval; |
|
inet->transparent = !!val; |
|
break; |
|
|
|
case IP_MINTTL: |
|
if (optlen < 1) |
|
goto e_inval; |
|
if (val < 0 || val > 255) |
|
goto e_inval; |
|
|
|
if (val) |
|
static_branch_enable(&ip4_min_ttl); |
|
|
|
/* tcp_v4_err() and tcp_v4_rcv() might read min_ttl |
|
* while we are changint it. |
|
*/ |
|
WRITE_ONCE(inet->min_ttl, val); |
|
break; |
|
|
|
default: |
|
err = -ENOPROTOOPT; |
|
break; |
|
} |
|
release_sock(sk); |
|
if (needs_rtnl) |
|
rtnl_unlock(); |
|
return err; |
|
|
|
e_inval: |
|
release_sock(sk); |
|
if (needs_rtnl) |
|
rtnl_unlock(); |
|
return -EINVAL; |
|
} |
|
|
|
/** |
|
* ipv4_pktinfo_prepare - transfer some info from rtable to skb |
|
* @sk: socket |
|
* @skb: buffer |
|
* |
|
* To support IP_CMSG_PKTINFO option, we store rt_iif and specific |
|
* destination in skb->cb[] before dst drop. |
|
* This way, receiver doesn't make cache line misses to read rtable. |
|
*/ |
|
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
|
bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || |
|
ipv6_sk_rxinfo(sk); |
|
|
|
if (prepare && skb_rtable(skb)) { |
|
/* skb->cb is overloaded: prior to this point it is IP{6}CB |
|
* which has interface index (iif) as the first member of the |
|
* underlying inet{6}_skb_parm struct. This code then overlays |
|
* PKTINFO_SKB_CB and in_pktinfo also has iif as the first |
|
* element so the iif is picked up from the prior IPCB. If iif |
|
* is the loopback interface, then return the sending interface |
|
* (e.g., process binds socket to eth0 for Tx which is |
|
* redirected to loopback in the rtable/dst). |
|
*/ |
|
struct rtable *rt = skb_rtable(skb); |
|
bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); |
|
|
|
if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) |
|
pktinfo->ipi_ifindex = inet_iif(skb); |
|
else if (l3slave && rt && rt->rt_iif) |
|
pktinfo->ipi_ifindex = rt->rt_iif; |
|
|
|
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); |
|
} else { |
|
pktinfo->ipi_ifindex = 0; |
|
pktinfo->ipi_spec_dst.s_addr = 0; |
|
} |
|
skb_dst_drop(skb); |
|
} |
|
|
|
int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
|
unsigned int optlen) |
|
{ |
|
int err; |
|
|
|
if (level != SOL_IP) |
|
return -ENOPROTOOPT; |
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH) |
|
if (optname >= BPFILTER_IPT_SO_SET_REPLACE && |
|
optname < BPFILTER_IPT_SET_MAX) |
|
err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); |
|
#endif |
|
#ifdef CONFIG_NETFILTER |
|
/* we need to exclude all possible ENOPROTOOPTs except default case */ |
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
|
optname != IP_IPSEC_POLICY && |
|
optname != IP_XFRM_POLICY && |
|
!ip_mroute_opt(optname)) |
|
err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
|
#endif |
|
return err; |
|
} |
|
EXPORT_SYMBOL(ip_setsockopt); |
|
|
|
/* |
|
* Get the options. Note for future reference. The GET of IP options gets |
|
* the _received_ ones. The set sets the _sent_ ones. |
|
*/ |
|
|
|
static bool getsockopt_needs_rtnl(int optname) |
|
{ |
|
switch (optname) { |
|
case IP_MSFILTER: |
|
case MCAST_MSFILTER: |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static int ip_get_mcast_msfilter(struct sock *sk, void __user *optval, |
|
int __user *optlen, int len) |
|
{ |
|
const int size0 = offsetof(struct group_filter, gf_slist_flex); |
|
struct group_filter __user *p = optval; |
|
struct group_filter gsf; |
|
int num; |
|
int err; |
|
|
|
if (len < size0) |
|
return -EINVAL; |
|
if (copy_from_user(&gsf, p, size0)) |
|
return -EFAULT; |
|
|
|
num = gsf.gf_numsrc; |
|
err = ip_mc_gsfget(sk, &gsf, p->gf_slist_flex); |
|
if (err) |
|
return err; |
|
if (gsf.gf_numsrc < num) |
|
num = gsf.gf_numsrc; |
|
if (put_user(GROUP_FILTER_SIZE(num), optlen) || |
|
copy_to_user(p, &gsf, size0)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int compat_ip_get_mcast_msfilter(struct sock *sk, void __user *optval, |
|
int __user *optlen, int len) |
|
{ |
|
const int size0 = offsetof(struct compat_group_filter, gf_slist_flex); |
|
struct compat_group_filter __user *p = optval; |
|
struct compat_group_filter gf32; |
|
struct group_filter gf; |
|
int num; |
|
int err; |
|
|
|
if (len < size0) |
|
return -EINVAL; |
|
if (copy_from_user(&gf32, p, size0)) |
|
return -EFAULT; |
|
|
|
gf.gf_interface = gf32.gf_interface; |
|
gf.gf_fmode = gf32.gf_fmode; |
|
num = gf.gf_numsrc = gf32.gf_numsrc; |
|
gf.gf_group = gf32.gf_group; |
|
|
|
err = ip_mc_gsfget(sk, &gf, p->gf_slist_flex); |
|
if (err) |
|
return err; |
|
if (gf.gf_numsrc < num) |
|
num = gf.gf_numsrc; |
|
len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32)); |
|
if (put_user(len, optlen) || |
|
put_user(gf.gf_fmode, &p->gf_fmode) || |
|
put_user(gf.gf_numsrc, &p->gf_numsrc)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
|
char __user *optval, int __user *optlen) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
bool needs_rtnl = getsockopt_needs_rtnl(optname); |
|
int val, err = 0; |
|
int len; |
|
|
|
if (level != SOL_IP) |
|
return -EOPNOTSUPP; |
|
|
|
if (ip_mroute_opt(optname)) |
|
return ip_mroute_getsockopt(sk, optname, optval, optlen); |
|
|
|
if (get_user(len, optlen)) |
|
return -EFAULT; |
|
if (len < 0) |
|
return -EINVAL; |
|
|
|
if (needs_rtnl) |
|
rtnl_lock(); |
|
lock_sock(sk); |
|
|
|
switch (optname) { |
|
case IP_OPTIONS: |
|
{ |
|
unsigned char optbuf[sizeof(struct ip_options)+40]; |
|
struct ip_options *opt = (struct ip_options *)optbuf; |
|
struct ip_options_rcu *inet_opt; |
|
|
|
inet_opt = rcu_dereference_protected(inet->inet_opt, |
|
lockdep_sock_is_held(sk)); |
|
opt->optlen = 0; |
|
if (inet_opt) |
|
memcpy(optbuf, &inet_opt->opt, |
|
sizeof(struct ip_options) + |
|
inet_opt->opt.optlen); |
|
release_sock(sk); |
|
|
|
if (opt->optlen == 0) |
|
return put_user(0, optlen); |
|
|
|
ip_options_undo(opt); |
|
|
|
len = min_t(unsigned int, len, opt->optlen); |
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, opt->__data, len)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
case IP_PKTINFO: |
|
val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; |
|
break; |
|
case IP_RECVTTL: |
|
val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; |
|
break; |
|
case IP_RECVTOS: |
|
val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; |
|
break; |
|
case IP_RECVOPTS: |
|
val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; |
|
break; |
|
case IP_RETOPTS: |
|
val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; |
|
break; |
|
case IP_PASSSEC: |
|
val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; |
|
break; |
|
case IP_RECVORIGDSTADDR: |
|
val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; |
|
break; |
|
case IP_CHECKSUM: |
|
val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; |
|
break; |
|
case IP_RECVFRAGSIZE: |
|
val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; |
|
break; |
|
case IP_TOS: |
|
val = inet->tos; |
|
break; |
|
case IP_TTL: |
|
{ |
|
struct net *net = sock_net(sk); |
|
val = (inet->uc_ttl == -1 ? |
|
net->ipv4.sysctl_ip_default_ttl : |
|
inet->uc_ttl); |
|
break; |
|
} |
|
case IP_HDRINCL: |
|
val = inet->hdrincl; |
|
break; |
|
case IP_NODEFRAG: |
|
val = inet->nodefrag; |
|
break; |
|
case IP_BIND_ADDRESS_NO_PORT: |
|
val = inet->bind_address_no_port; |
|
break; |
|
case IP_MTU_DISCOVER: |
|
val = inet->pmtudisc; |
|
break; |
|
case IP_MTU: |
|
{ |
|
struct dst_entry *dst; |
|
val = 0; |
|
dst = sk_dst_get(sk); |
|
if (dst) { |
|
val = dst_mtu(dst); |
|
dst_release(dst); |
|
} |
|
if (!val) { |
|
release_sock(sk); |
|
return -ENOTCONN; |
|
} |
|
break; |
|
} |
|
case IP_RECVERR: |
|
val = inet->recverr; |
|
break; |
|
case IP_RECVERR_RFC4884: |
|
val = inet->recverr_rfc4884; |
|
break; |
|
case IP_MULTICAST_TTL: |
|
val = inet->mc_ttl; |
|
break; |
|
case IP_MULTICAST_LOOP: |
|
val = inet->mc_loop; |
|
break; |
|
case IP_UNICAST_IF: |
|
val = (__force int)htonl((__u32) inet->uc_index); |
|
break; |
|
case IP_MULTICAST_IF: |
|
{ |
|
struct in_addr addr; |
|
len = min_t(unsigned int, len, sizeof(struct in_addr)); |
|
addr.s_addr = inet->mc_addr; |
|
release_sock(sk); |
|
|
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, &addr, len)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
case IP_MSFILTER: |
|
{ |
|
struct ip_msfilter msf; |
|
|
|
if (len < IP_MSFILTER_SIZE(0)) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
|
err = -EFAULT; |
|
goto out; |
|
} |
|
err = ip_mc_msfget(sk, &msf, |
|
(struct ip_msfilter __user *)optval, optlen); |
|
goto out; |
|
} |
|
case MCAST_MSFILTER: |
|
if (in_compat_syscall()) |
|
err = compat_ip_get_mcast_msfilter(sk, optval, optlen, |
|
len); |
|
else |
|
err = ip_get_mcast_msfilter(sk, optval, optlen, len); |
|
goto out; |
|
case IP_MULTICAST_ALL: |
|
val = inet->mc_all; |
|
break; |
|
case IP_PKTOPTIONS: |
|
{ |
|
struct msghdr msg; |
|
|
|
release_sock(sk); |
|
|
|
if (sk->sk_type != SOCK_STREAM) |
|
return -ENOPROTOOPT; |
|
|
|
msg.msg_control_is_user = true; |
|
msg.msg_control_user = optval; |
|
msg.msg_controllen = len; |
|
msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0; |
|
|
|
if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
|
struct in_pktinfo info; |
|
|
|
info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
|
info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; |
|
info.ipi_ifindex = inet->mc_index; |
|
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
|
} |
|
if (inet->cmsg_flags & IP_CMSG_TTL) { |
|
int hlim = inet->mc_ttl; |
|
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); |
|
} |
|
if (inet->cmsg_flags & IP_CMSG_TOS) { |
|
int tos = inet->rcv_tos; |
|
put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); |
|
} |
|
len -= msg.msg_controllen; |
|
return put_user(len, optlen); |
|
} |
|
case IP_FREEBIND: |
|
val = inet->freebind; |
|
break; |
|
case IP_TRANSPARENT: |
|
val = inet->transparent; |
|
break; |
|
case IP_MINTTL: |
|
val = inet->min_ttl; |
|
break; |
|
default: |
|
release_sock(sk); |
|
return -ENOPROTOOPT; |
|
} |
|
release_sock(sk); |
|
|
|
if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
|
unsigned char ucval = (unsigned char)val; |
|
len = 1; |
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, &ucval, 1)) |
|
return -EFAULT; |
|
} else { |
|
len = min_t(unsigned int, sizeof(int), len); |
|
if (put_user(len, optlen)) |
|
return -EFAULT; |
|
if (copy_to_user(optval, &val, len)) |
|
return -EFAULT; |
|
} |
|
return 0; |
|
|
|
out: |
|
release_sock(sk); |
|
if (needs_rtnl) |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
|
|
int ip_getsockopt(struct sock *sk, int level, |
|
int optname, char __user *optval, int __user *optlen) |
|
{ |
|
int err; |
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
|
|
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH) |
|
if (optname >= BPFILTER_IPT_SO_GET_INFO && |
|
optname < BPFILTER_IPT_GET_MAX) |
|
err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); |
|
#endif |
|
#ifdef CONFIG_NETFILTER |
|
/* we need to exclude all possible ENOPROTOOPTs except default case */ |
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
|
!ip_mroute_opt(optname)) { |
|
int len; |
|
|
|
if (get_user(len, optlen)) |
|
return -EFAULT; |
|
|
|
err = nf_getsockopt(sk, PF_INET, optname, optval, &len); |
|
if (err >= 0) |
|
err = put_user(len, optlen); |
|
return err; |
|
} |
|
#endif |
|
return err; |
|
} |
|
EXPORT_SYMBOL(ip_getsockopt);
|
|
|