d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Push down pcbinfo and inpcb locking from udp_send() into udp_output().

Browse Source 
This provides greater context for the locking and allows us to avoid
locking the pcbinfo structure if not binding operations will take
place (i.e., already bound, connected, and no expliti sendto()
address).
This commit is contained in:
Robert Watson 2004-08-19 01:13:10 +00:00
parent 4c2bb15a89
commit 5c32ea6517
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133994
1 changed files with 35 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
sys/netinet/udp_usrreq.c
View File

@ -729,17 +729,19 @@ udp_output(inp, m, addr, control, td)
int error = 0;
int ipflags;
u_short fport, lport;
int unlock_udbinfo;
INP_LOCK_ASSERT(inp);
#ifdef MAC
mac_create_mbuf_from_inpcb(inp, m);
#endif
/*
* udp_output() may need to temporarily bind or connect the current
* inpcb. As such, we don't know up front what inpcb locks we will
* need. Do any work to decide what is needed up front before
* acquiring locks.
*/
if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
error = EMSGSIZE;
if (control)
m_freem(control);
goto release;
m_freem(m);
return EMSGSIZE;
}
src.sin_addr.s_addr = INADDR_ANY;
@ -749,9 +751,9 @@ udp_output(inp, m, addr, control, td)
* is stored in a single mbuf.
*/
if (control->m_next) {
error = EINVAL;
m_freem(control);
goto release;
m_freem(m);
return EINVAL;
}
for (; control->m_len > 0;
control->m_data += CMSG_ALIGN(cm->cmsg_len),
@ -787,8 +789,23 @@ udp_output(inp, m, addr, control, td)
}
m_freem(control);
}
if (error)
goto release;
if (error) {
m_freem(m);
return error;
}
if (src.sin_addr.s_addr != INADDR_ANY ||
addr != NULL) {
INP_INFO_WLOCK(&udbinfo);
unlock_udbinfo = 1;
} else
unlock_udbinfo = 0;
INP_LOCK(inp);
#ifdef MAC
mac_create_mbuf_from_inpcb(inp, m);
#endif
laddr = inp->inp_laddr;
lport = inp->inp_lport;
if (src.sin_addr.s_addr != INADDR_ANY) {
@ -879,11 +896,17 @@ udp_output(inp, m, addr, control, td)
((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
udpstat.udps_opackets++;
if (unlock_udbinfo)
INP_INFO_WUNLOCK(&udbinfo);
error = ip_output(m, inp->inp_options, NULL, ipflags,
inp->inp_moptions, inp);
INP_UNLOCK(inp);
return (error);
release:
INP_UNLOCK(inp);
if (unlock_udbinfo)
INP_INFO_WUNLOCK(&udbinfo);
m_freem(m);
return (error);
}
@ -1065,22 +1088,9 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *td)
{
struct inpcb *inp;
int ret;
INP_INFO_WLOCK(&udbinfo);
inp = sotoinpcb(so);
if (inp == 0) {
INP_INFO_WUNLOCK(&udbinfo);
m_freem(m);
if (control != NULL)
m_freem(control);
return EINVAL;
}
INP_LOCK(inp);
ret = udp_output(inp, m, addr, control, td);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&udbinfo);
return ret;
return udp_output(inp, m, addr, control, td);
}
int