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bgpd: Fix errors handling for MP/GR capabilities as dynamic capability (backport #15640) #15690
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When receiving a MP/GR capability as dynamic capability, but malformed, do not forget to advance the pointer to avoid hitting infinity loop. After: ``` Mar 29 11:15:28 donatas-laptop bgpd[353550]: [GS0AQ-HKY0X] 127.0.0.1 rcv CAPABILITY Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 5, length 0 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 0, length 0 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 0 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 0 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 1 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:15:28 donatas-laptop bgpd[353550]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) ``` Before: ``` Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast) Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10 ``` Reported-by: Iggy Frankovic <iggyfran@amazon.com> Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org> (cherry picked from commit 30a332d)
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This is an automatic backport of pull request #15640 done by [Mergify](https://mergify.com).