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devip: ignore icmp advise about laggard fragments

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icmp has to advise protocols about the first
fragment only. all other fragments should be
ignored.
This commit is contained in:
cinap_lenrek 2019-03-07 01:25:11 +01:00
parent 88e054ffdf
commit 4885c75526
2 changed files with 12 additions and 9 deletions
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10
sys/src/9/ip/icmp.c
View file

@ -401,10 +401,12 @@ icmpiput(Proto *icmp, Ipifc*, Block *bp)
goto raise;
}
p = (Icmp *)bp->rp;
pr = Fsrcvpcolx(icmp->f, p->proto);
if(pr != nil && pr->advise != nil) {
(*pr->advise)(pr, bp, msg);
return;
if((nhgets(p->frag) & ~(IP_DF|IP_MF)) == 0){
pr = Fsrcvpcolx(icmp->f, p->proto);
if(pr != nil && pr->advise != nil) {
(*pr->advise)(pr, bp, msg);
return;
}
}
bp->rp -= ICMP_IPSIZE+ICMP_HDRSIZE;
goticmpkt(icmp, bp);

11
sys/src/9/ip/icmp6.c
View file

@ -725,11 +725,12 @@ icmpiput6(Proto *icmp, Ipifc *ifc, Block *bp)
bp->rp -= IP6HDR;
}
}
pr = Fsrcvpcolx(icmp->f, p->proto);
if(pr != nil && pr->advise != nil) {
(*pr->advise)(pr, bp, msg);
return;
if(p->proto != FH){
pr = Fsrcvpcolx(icmp->f, p->proto);
if(pr != nil && pr->advise != nil) {
(*pr->advise)(pr, bp, msg);
return;
}
}
bp->rp -= IPICMPSZ;
goticmpkt6(icmp, bp, 0);