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In both dropwithreset paths in tcp_input.c, drop the tcbinfo lock
sooner to decomplicate locking and eliminate the need for a rather chatty comment about why we have to handle the global lock in a special way for the benefit of ipfw and pf cred rules. MFC after: 3 days
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=184304
@ -896,19 +896,12 @@ tcp_input(struct mbuf *m, int off0)
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dropwithreset:
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INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
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INP_INFO_WUNLOCK(&V_tcbinfo);
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/*
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* If inp is non-NULL, we call tcp_dropwithreset() holding both inpcb
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* and global locks. However, if NULL, we must hold neither as
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* firewalls may acquire the global lock in order to look for a
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* matching inpcb.
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*/
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if (inp != NULL) {
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tcp_dropwithreset(m, th, tp, tlen, rstreason);
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INP_WUNLOCK(inp);
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}
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INP_INFO_WUNLOCK(&V_tcbinfo);
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if (inp == NULL)
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} else
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tcp_dropwithreset(m, th, NULL, tlen, rstreason);
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m = NULL; /* mbuf chain got consumed. */
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goto drop;
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@ -2498,19 +2491,12 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
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dropwithreset:
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KASSERT(headlocked, ("%s: dropwithreset: head not locked", __func__));
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INP_INFO_WUNLOCK(&V_tcbinfo);
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/*
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* If tp is non-NULL, we call tcp_dropwithreset() holding both inpcb
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* and global locks. However, if NULL, we must hold neither as
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* firewalls may acquire the global lock in order to look for a
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* matching inpcb.
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*/
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if (tp != NULL) {
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tcp_dropwithreset(m, th, tp, tlen, rstreason);
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INP_WUNLOCK(tp->t_inpcb);
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}
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INP_INFO_WUNLOCK(&V_tcbinfo);
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if (tp == NULL)
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} else
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tcp_dropwithreset(m, th, NULL, tlen, rstreason);
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return;
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